Comprehensive testing device and testing method for high-voltage circuit breaker

Abstract

The invention discloses a comprehensive testing device for a high-voltage circuit breaker, and the device comprises a main control module which is connected with a power control module, a secondary detection module, a jump sampling module, and an auxiliary power module. The secondary detection module is respectively connected with the jump sampling module, the port protection module and the heavy load connector; the auxiliary power supply module is connected with the power supply control module and the jump sampling module. The port protection module is connected with the time test port. The power supply control module is connected with the jump sampling module, the heavy load connector, the sensor port, the external synchronization port and the return resistance test port. The invention further discloses a comprehensive testing method for the high-voltage circuit breaker. According to the comprehensive testing device, the functions of circuit breaker mechanical characteristic testing, circuit breaker secondary loop detection and circuit breaker loop resistance testing are integrated into the same device, the circuit breaker can be detected only by completing wiring between the circuit breaker and the comprehensive testing device, operation is convenient, and the testing result is accurate and is not affected by the personnel level.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and in particular to a comprehensive testing device and a testing method for a high-voltage circuit breaker. Background Art

[0002] High-voltage circuit breakers are the main power control equipment in substations. When the system is operating normally, they can cut off and connect the no-load and load currents of the lines and various electrical equipment; when the system fails, it cooperates with the relay protection to quickly cut off the fault current to prevent the scope of the accident from expanding. Therefore, the quality of the high-voltage circuit breaker directly affects the safe operation of the power system. With the increase of service time, some parts of the circuit breaker will continue to age or be damaged, such as wear of the mechanical mechanism, wear of the contacts, and failure of the secondary mechanism of the opening and closing. These problems may cause the circuit breaker to malfunction and even affect the safe operation of the entire power grid. Therefore, it is very important to regularly check the performance of the circuit breaker and evaluate its operating status. The daily inspection of high-voltage circuit breakers mainly includes three items: secondary circuit detection, mechanical characteristics detection and contact resistance detection. However, at present, the detection functions of most circuit breaker testers are relatively simple, and they can only perform mechanical property detection or loop resistance detection separately, and the detection results need to be obtained through manual data analysis. When performing secondary circuit detection, a multimeter needs to be used to test each circuit, and it is also necessary to check whether the current circuit should be on or off. A large number of detection equipment are required, and a large amount of manpower is required to complete. The detection efficiency is low and the workload is heavy. It is easily limited by the professional level and experience of personnel, and the accuracy of the detection results is difficult to guarantee.

[0003] The "multifunctional high-voltage vacuum circuit breaker mechanical property test device" disclosed in the Chinese patent literature has a publication number of CN105277881B and a publication date of 2016-09-14, comprising: a frame composed of upper and lower horizontal plates (7, 5) and left and right columns (6), a sleeve (8) and a simulated pull rod (4); the sleeve passes through and is fixed in the adjustable through hole of the upper horizontal plate, a linear displacement sensor (12) is provided in the large hole (31) of the sleeve, a small hole (32) for the signal input rod (13) to pass through, and a force sensor (14) is connected and fixed at the lower end, and the lower end of the signal input rod is connected to the upper end of the simulated pull rod; the upper end of the simulated pull rod is threadedly connected to the flange (9), and the lower end can slide from the frame through the guide hole (24) of the upper horizontal plate and extend downward to be connected to the rotating bracket (3) of the circuit breaker connecting rod (2); the speed sensor (16) and the acceleration sensor (15) are assembled on the large mounting hole (22) and the small mounting hole (21) of the flange (9). The test device in this technology tests the mechanical characteristics of the circuit breaker and does not have the functions of loop resistance detection and secondary circuit detection. Therefore, other detection equipment is still needed to detect the circuit breaker. A large number of devices are required, the operation is cumbersome, and the accuracy of the test results is easily affected by the limitations of personnel's professional level and experience. Summary of the invention

[0004] The present invention aims to overcome the problem that different detection equipment is needed to detect different detection items when detecting a high-voltage circuit breaker in the prior art, and a large number of devices are needed, and a large amount of manpower is needed to operate, which is easily limited by the professional level and experience of personnel, and it is difficult to ensure the accuracy of the detection results. A high-voltage circuit breaker comprehensive test device and a test method are provided, which integrate the functions of circuit breaker mechanical characteristic test, circuit breaker secondary circuit test and circuit breaker circuit resistance test into the same device, and the circuit breaker detection can be performed only by completing the wiring between the circuit breaker and the comprehensive test device, which is easy to operate and the test results are accurate and are not affected by the level of personnel.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A high-voltage circuit breaker comprehensive test device comprises a main control module, wherein the main control module is respectively connected to a power control module, a secondary detection module, a jump sampling module and an auxiliary power supply module; the secondary detection module is respectively connected to a jump sampling module, a port protection module and a heavy-duty connector, and performs switching connection between the port protection module and the heavy-duty connector; the auxiliary power supply module is respectively connected to a power control module and a jump sampling module; the port protection module is connected to a time test port, and the power control module is respectively connected to a jump sampling module, a heavy-duty connector, a sensor port, an external synchronization port and a return resistance test port.

[0007] The high-voltage circuit breaker comprehensive test device of the present invention integrates the circuit breaker mechanical characteristic test, circuit breaker secondary circuit detection and circuit breaker loop resistance test functions. On the basis of only being able to perform the circuit breaker mechanical characteristic test, the switching and on-off detection of different secondary auxiliary circuits are realized through the jump sampling module, the secondary detection module and the heavy-duty connector connected to the circuit breaker; at the same time, the loop resistance detection is performed through the return resistance test port and the loop circuit in the power control module; therefore, it is only necessary to complete the connection between each port on one device and the circuit breaker to automatically perform various items of circuit breaker detection according to the set conditions. The operation is convenient and the detection result is accurate and is not affected by the professional level and experience of the personnel.

[0008] Preferably, the heavy-load connector is connected to the circuit breaker through a dedicated conversion line; the heavy-load connector includes a plurality of pairs of voltage output ports and a plurality of pairs of auxiliary ports; the voltage output port includes an opening terminal, a closing terminal, a locking terminal and an energy storage terminal; the auxiliary port includes an opening auxiliary terminal, a closing auxiliary terminal, an energy storage auxiliary terminal, a test auxiliary terminal and an operation auxiliary terminal, which are connected to the secondary auxiliary circuit of the circuit breaker for on-off status testing.

[0009] In the present invention, since there are many types of actual circuit breakers and the definition settings of the interface terminals of the circuit breakers are also different, corresponding dedicated conversion lines are set according to the most common types of circuit breakers to connect the heavy-load connector and the circuit breaker. The terminal correspondence problem between the heavy-load connector and the circuit breaker interface is solved directly through the dedicated connecting line, and there is no need for personnel to connect the wires one by one according to the drawings, which is more convenient to operate.

[0010] Preferably, the secondary detection module includes several groups of multi-stage channel switching units; in the multi-stage channel switching units, the moving contact of the double-pole double-throw relay of the first stage is connected to a pair of on-off test terminals in the jump sampling module, the normally closed contact is connected to a pair of time test terminals of the port protection module, and the normally open contact is connected to the moving contact of the double-pole double-throw relay of the next stage; the normally closed contact of the double-pole double-throw relay of the i-th stage is connected to the moving contact of the double-pole double-throw relay of the next stage, and the normally open contact is connected to a pair of auxiliary ports of the heavy-duty connector; the normally open contact and the normally closed contact of the double-pole double-throw relay of the last stage are respectively connected to a pair of auxiliary ports; the coil of the relay of each stage is connected to the relay drive circuit of its corresponding stage.

[0011] The secondary detection module in the present invention tests the on-off state of each auxiliary circuit of the secondary circuit of the circuit breaker through the control and switching of the relay array. The auxiliary ports connected to each double-pole double-throw relay are different. Since no current passes through the relay coil when the relay drive circuit is not driven, the moving contact of the relay is connected to the normally closed contact. Therefore, when it is necessary to detect the on-off state of a pair of auxiliary ports, it is only necessary for the relay drive circuit to control the relay coil connected to the auxiliary port to pass current for attraction, thereby connecting the moving contact to the normally open contact, so that the pair of auxiliary ports are connected to the port jump unit through the corresponding on-off test terminal of the relay array for on-off detection; for the auxiliary port connected to the last-stage relay, the drive of the relay drive circuit can be controlled according to whether it is connected to the normally open contact or the normally closed contact; at the same time, the secondary detection module can also be switched to detect the connectivity state of the time test port.

[0012] Preferably, the port protection module includes a plurality of protection units, wherein the two ends of the first TVS tube in the protection unit are respectively connected to a pair of time test ports through a wiring terminal, one end of the first TVS tube is respectively connected to one end of the second TVS tube, one end of the first capacitor and one end of the first resistor, the other end of the first TVS tube is respectively connected to one end of the third TVS tube, one end of the second capacitor and one end of the second resistor, the other end of the second TVS tube, the other end of the third TVS tube, the other end of the first capacitor and the other end of the second capacitor are connected to one end of the third capacitor and grounded, and the other end of the third capacitor is respectively connected to the other end of the first resistor and the other end of the second resistor; the two ends of the first TVS tube are a pair of time test ends.

[0013] In the present invention, a port protection module is provided to protect the circuit in the device. During the detection process of the opening and closing operation, since the time process of connection and disconnection is extremely short, the transient interference caused by the rapid connection and disconnection at the time test port will affect and damage the circuit in the device. Therefore, a protection unit circuit composed of a transient suppression diode TVS tube and a capacitor is provided to ensure that the subsequent circuit is protected from damage due to the impact of transient high energy.

[0014] Preferably, the jump sampling module includes several groups of port jump units, one end of a pair of on-off test ends in the port jump unit is connected to the sampling voltage through a filtering circuit, and the other end is connected to the source of the first MOS tube, the gate of the first MOS tube is provided with a gate voltage by the sampling voltage, and the drain of the first MOS tube is grounded through a sampling test resistor; the voltage signals at both ends of the sampling test resistor are respectively input into the first negative phase input end and the second negative phase input end of the dual comparator, the sampling voltage is respectively connected to the first positive phase input end and the second positive phase input end of the dual comparator through the first voltage divider circuit and the second voltage divider circuit, the first output end of the dual comparator is connected to the input end of the first optocoupler, the second output end of the dual comparator is connected to the input end of the second optocoupler, and the output end of the first optocoupler and the output end of the second optocoupler input the on-off signal into the main control module.

[0015] In the present invention, when the auxiliary circuit is not turned on, the on-off test end does not form a path, the voltage across the sampling test resistor is 0, and the dual comparator output is a high level; when the auxiliary circuit is turned on, the on-off test end forms a path, there is voltage across the sampling test resistor, and the dual comparator output flips, so that the on-off condition of the auxiliary circuit can be judged; in addition, the design of the port jump unit circuit of the present invention uses current as a trigger signal. Only when the current in the circuit is greater than a certain value, the dual comparator will output a jump state and transmit it to the main control module through an optical coupler. Compared with the voltage triggering method of the existing technology center through a resistor plus an optical coupler, it can avoid the interference caused by static electricity on site and improve the accuracy of the test result.

[0016] Preferably, the jump sampling circuit also includes two groups of voltage trigger units, in each group of voltage trigger units, the input end of the rectifier bridge is connected to a pair of trigger ends, the output end of the rectifier bridge is connected to the source of the second MOS tube, the gate of the second MOS tube is provided with a gate voltage by the trigger voltage, and the drain of the second MOS tube is grounded through a trigger test resistor; the voltage signal at both ends of the trigger test resistor is input to the first negative phase input end of the dual comparator, the trigger voltage is connected to the first positive phase input end of the dual comparator through a trigger voltage divider circuit, the first output end of the dual comparator is connected to the input end of the optocoupler, and the output end of the optocoupler inputs and outputs the trigger signal to and from the main control module; the two pairs of trigger ends are connected to the separation and combination output of the power control module and the external trigger switching circuit.

[0017] In addition to several groups of completely electrically isolated port jump units, the jump sampling module of the present invention is also provided with two groups of voltage trigger units, which are trigger circuits for testing internal operating power and external synchronization signals, and provide a time starting point for the test process; in addition, the circuit of the second half of the voltage trigger unit is basically the same as the circuit of the port jump unit, and its purpose is also to avoid interference caused by static electricity on site and improve the accuracy of test results and trigger time.

[0018] Preferably, the power control module includes a power switch circuit, which is respectively connected to an operating power circuit, a loop resistance circuit and a locking power circuit; the loop resistance circuit is connected to a return resistance test port; the operating power circuit and the external resistance measurement circuit are connected to the opening and closing ends of the heavy-load connector through a first output switching circuit, and the locking power circuit and the external resistance measurement circuit are connected to the locking end and the energy storage end of the heavy-load connector through a second output switching circuit to switch between voltage output and external resistance measurement.

[0019] The power control module in the present invention has two power supplies, one is the operating power supply in the operating power circuit, and the other is the loop resistance test constant current source in the loop resistance circuit, which is used to supply power for various tests in the comprehensive test device.

[0020] Preferably, the power control module also includes a signal input switching circuit, the output end of the signal input switching circuit is connected to the input end of the isolation sampling circuit in the main control module, and the input end of the signal input switching circuit is respectively connected to the operating power circuit, the loop resistance circuit, the locking power circuit and the sensor port to switch different measurement signals.

[0021] The signal input switching circuit in the present invention also uses a multi-stage double-pole double-throw relay for switching operation, and can switch and select energy storage voltage measurement, sensor measurement, locking voltage measurement, operating current and voltage measurement, external current and voltage measurement, and return resistance current and voltage measurement and input them into the isolation sampling circuit to sample and process the signal.

[0022] Preferably, the operating power supply circuit includes an operating power supply U16, wherein the first positive voltage end of U16 is respectively connected to the collector of IGBT tube Q12 and the collector of IGBT tube Q14, two TVS tubes connected in series are connected between the collector and emitter of Q12, two TVS tubes connected in series are connected between the collector and emitter of Q14, a gate-off control output circuit is connected between the gate and emitter of Q12, and a gate-on control output circuit is connected between the gate and emitter of Q14; the first negative voltage end of U16 is connected to the cathode of diode D118, and the connection line of the anode of diode D118 passes through the Hall sensor and is connected to the first output switching circuit with the emitter of Q12 as the gate-off output end; the connection line of the anode of diode D118 passes through the Hall sensor and is connected to the first output switching circuit with the emitter of Q14 as the gate-on output end, and the output voltage of the Hall sensor is input into the signal input switching circuit.

[0023] The operating power supply circuit in the present invention can generate a circuit breaker operating coil operating power supply with adjustable voltage, and the output is controlled by a high-power IGBT tube, thereby avoiding the arcing phenomenon caused by cutting off the power output when using a relay to control the output; at the same time, a Hall sensor is used to detect the operating current signal in the operating power supply circuit and input it into the signal input switching circuit; in addition, both the opening control output circuit and the closing control output circuit are controlled by optical coupling emitter output, and the fast opening speed and slow closing speed are conducive to ensuring the safe shutdown of the IGBT tube.

[0024] Preferably, the main control module includes two isolation sampling circuits, and the measurement signal of the input isolation sampling circuit is sequentially input into the main controller after passing through the first amplification circuit, the second level adjustment amplification circuit, the AD conversion circuit and the digital isolation circuit; the second level adjustment amplification circuit includes an operational amplifier, and two capacitors are connected in series between the first capacitor terminal and the second capacitor terminal of the operational amplifier, and the connection point of the two capacitors is connected to the negative amplification voltage; the positive phase input terminal of the operational amplifier is connected to the output terminal of the first amplification circuit, and the positive amplification voltage is input to the power supply terminal of the operational amplifier; the output terminal of the operational amplifier is connected to the input terminal of the AD conversion circuit, and is also connected to the moving contact of the first relay, the normally closed contact of the first relay is connected to the moving contact of the second relay, and the normally open output terminal of the first relay is connected to the moving contact of the third relay; the normally closed contact of the second relay is connected to the negative phase input terminal of the operational amplifier, and the normally open contact of the second relay, the normally closed contact of the third relay, and the normally open contact of the third relay are respectively connected to the negative phase input terminal of the operational amplifier through resistors with different resistance values; the coil of each relay is connected to its corresponding relay drive circuit.

[0025] The isolated sampling circuit in the present invention can simultaneously sample signals such as voltage, current and sensor, and is composed of an operational amplifier, a high-speed AD converter, a precision source and a digital isolation chip. At the same time, the channel is configured with X1, X10, and X100 amplification channels. By controlling the relay in the second level-adjusting amplifier circuit to perform amplification of different multiples, AC signals can also be sampled. The chopper-stabilized operational amplifier is characterized in that the offset voltage is very low, only at the microvolt level. Since the signals during loop resistance testing and other signal testing are very small, only a few millivolts at the minimum, the offset of ordinary operational amplifiers is relatively large, which will affect the measurement accuracy. Therefore, the use of a chopper-stabilized operational amplifier is beneficial to signal acquisition in the present invention.

[0026] Preferably, the main control module includes a main controller, which is respectively connected to the indicator light module, the communication unit, the display screen and operation unit, the USB unit and the printer unit.

[0027] The indicator light module in the present invention can indicate the current working status, the communication unit can wirelessly send the data collected by the comprehensive detection device to the background server or the cloud for data aggregation, and subsequent comprehensive judgment and circuit breaker diagnosis; the display screen and the operation unit can perform detection settings of the comprehensive detection device, the USB unit can save the data to a U disk for transfer, and the printer unit can print the detection data and the waveform.

[0028] Preferably, the comprehensive testing device comprises a chassis and a panel that are fixedly connected, and a main control module, a power control module, a secondary detection module, a jump sampling module, a port protection module and an auxiliary power supply module are arranged in a cavity formed by the chassis and the panel; the heavy-load connector, the time test port, the sensor port, the external synchronization port and the return resistance test port are fixed on the panel; the main controller is fixed on the back of the panel, and an indicator light, a communication antenna, a display screen, a display screen operation area, a USB interface and a printer are also arranged on the panel.

[0029] The comprehensive test device in the present invention is a box body, which is composed of a chassis and a panel fixedly connected. All functional modules are arranged in the chassis, and a flap is arranged on the panel to facilitate the movement and placement of the entire device. At the same time, all ports in the comprehensive test device that need to be connected to the circuit breaker are arranged on the panel to facilitate connection during detection. Ventilation holes are also arranged on the chassis to dissipate heat and avoid excessive temperature when the comprehensive test device is working.

[0030] Preferably, the auxiliary power supply module includes several transformers, the two ends of the primary coil of each transformer are respectively connected to the source of the third MOS tube and the source of the fourth MOS tube, and the middle tap of the primary coil is connected to the main voltage; a resistor and a capacitor are connected in series between the sources of the two MOS tubes, the gate of the third MOS tube receives the first control signal of the chip U32, and the gate of the fourth MOS tube receives the second control signal of the chip U32; each transformer includes several secondary coils, each secondary coil is connected to a linear voltage stabilization circuit, and different voltage input jump sampling modules, power supply control modules and main control modules are provided.

[0031] In the present invention, the auxiliary power supply circuit first uses a push-pull offline switching power supply circuit to convert a set of input main voltages into many sets of voltage outputs, and realizes electrical isolation of each auxiliary power supply through the multi-winding output of the transformer to avoid cross-connection when connected to each other, and then uses a linear voltage regulator in each output to convert these voltage-inconstant outputs into stable voltages of various voltage levels required by the circuit; the use of a switching power supply circuit can save the multi-winding power frequency transformer, reducing the volume and weight.

[0032] Preferably, the sensor port is connected to a sensor of a stroke testing mechanism, and the stroke testing mechanism includes a universal bracket that can open and close and rotate, one end of the universal bracket is rotatably connected to the circuit breaker body, and the other end is transmission connected to a fixture, the fixture is connected to the crank arm of the circuit breaker through a connecting shaft, and the sensor is fixed on the fixture.

[0033] The speed characteristic of the circuit breaker in the present invention is achieved by synchronously connecting the transmission shaft of the circuit breaker with an externally installed sensor, so that the action process of the circuit breaker will be converted into an electrical signal through the sensor, and through timed sampling, a set of data streams will be formed and drawn into s / t, v / t waveform diagrams. The sensor converts the straight line or rotation process into a linear resistance change for testing.

[0034] A comprehensive testing method for a high voltage circuit breaker, comprising:

[0035] Connect the time test port to the moving contact and static contact of the circuit breaker, use the special adapter cable corresponding to the circuit breaker model to connect the secondary auxiliary circuit of the circuit breaker and the heavy-duty connector, connect the sensor port to the sensor of the stroke test mechanism, and connect the return resistance test port to the primary main circuit of the circuit breaker;

[0036] Conduct on-off detection of the secondary auxiliary circuit; control the circuit breaker to perform opening and closing actions, conduct operating coil characteristic tests, time characteristic tests, and speed characteristic tests to obtain mechanical characteristic results; use the four-terminal connection method to obtain loop resistance test results;

[0037] The current curve of the coil characteristic test and the stroke curve of the speed characteristic test during the opening and closing action are obtained to comprehensively diagnose the circuit breaker.

[0038] In the present invention, the comprehensive test device and the circuit breaker are first connected, and then various characteristic tests of the circuit breaker are performed. The mechanical characteristic test of the circuit breaker is basically consistent with the prior art and is therefore not described. For the loop resistance test of the circuit breaker, a four-terminal connection method is used to load a constant DC current at both ends of the loop resistance to be tested, and then the voltage drop of the constant current source on the resistor is tested at the lead closest to the resistor end, so that the size of the resistor to be tested is calculated according to Ohm's law; since the comprehensive test device of the present invention includes not only mechanical characteristic test and loop resistance test, but also secondary circuit detection function, the through-end detection of the secondary auxiliary circuit can also be performed; the above-mentioned characteristic tests ultimately display numerical results, which need to be comprehensively considered to judge the state of the circuit breaker. The evaluation results are relatively rough, so the circuit breaker diagnosis can be further performed according to the current curve and stroke curve collected during the characteristic test to obtain more accurate results.

[0039] Preferably, the on-off detection of the secondary auxiliary circuit includes:

[0040] The operating circuit breaker is in the waiting state. For any pair of auxiliary ports, the main control module controls the double-pole double-throw relay connected to the pair of auxiliary ports to energize, so that the moving contact is connected to the normally open contact, and the pair of auxiliary ports is connected to the port jump unit through the corresponding pair of on-off test terminals to detect the on-off of the secondary auxiliary circuit where the pair of auxiliary ports are located; the on-off detection of all secondary auxiliary circuits is completed in sequence according to the same operation.

[0041] The present invention summarizes that the through-end detection of the secondary auxiliary circuit involves three parts: a secondary detection module, a jump sampling module and a heavy-duty connector. The heavy-duty connector is connected to the terminals of the circuit breaker interface to form pairs of auxiliary ports, and the secondary detection module switches and selects the port to be detected and connects it to the port jump unit of the jump sampling module for through-end detection, and controls the relay according to the relay drive circuit to complete the switching detection of all auxiliary ports, thereby obtaining the on-off detection result of the secondary auxiliary circuit of the circuit breaker.

[0042] Preferably, the operating coil characteristic test, the time characteristic test and the speed characteristic test are performed to obtain the mechanical characteristic results, and it is determined whether the circuit breaker is in a normal working state according to preset judgment conditions, and an alarm is issued if not.

[0043] In the present invention, the mechanical characteristic test result is compared with the preset judgment condition to determine whether the circuit breaker is in a normal state. If it is normal, the circuit breaker continues to work. If it is abnormal, an alarm is issued and the specific problem of the circuit breaker is further diagnosed.

[0044] Preferably, the process of comprehensively performing circuit breaker diagnosis includes:

[0045] Discretize the current curve and the stroke curve, and multiply one of the discretized data as a row and the other as a column to obtain a numerical matrix. Normalize the numerical matrix and map it to the brightness value interval [0,255] to generate a grayscale image.

[0046] The texture information in the grayscale image is extracted to obtain the grayscale features, and the probabilistic neural network model is trained to obtain the fault diagnosis model; the fault diagnosis model is used to diagnose the circuit breaker fault and determine the fault type.

[0047] In the present invention, the status information of the circuit breaker is included in both the current curve and the travel curve, and there are differences in the status information included in different curves. Therefore, it is necessary to combine the current curve and the travel curve to diagnose the circuit breaker so as to improve the accuracy of the diagnosis result; and because the complete opening and closing process of the circuit breaker is relatively short, only between a few tenths of a second and a few seconds, and the jump time is mostly in milliseconds, it is possible to discretize at intervals of one millisecond to obtain current data and travel data of M discrete points arranged in chronological order, and combine the two to convert them into an M*M grayscale image, so that one image contains all the status information of the current curve and the travel curve, and then perform feature extraction on the grayscale image, and extract corresponding grayscale features according to the texture features of the grayscale image to perform fault diagnosis of the circuit breaker.

[0048] Preferably, the process of obtaining the grayscale feature includes: calculating the probability P(i,j,θ,d) of the point O1(x1,y1) with a grayscale value i and the point O2(x1+a(θ,d),y1+b(θ,d)) with a grayscale value j appearing; and arranging all the probabilities P into a square matrix with the grayscale values ​​of the point O1 as rows and the grayscale values ​​of the point O2 as columns to obtain a grayscale probability matrix;

[0049] The clarity feature, local change feature, energy feature and entropy feature are extracted from the grayscale probability matrix to form the grayscale feature.

[0050] In the present invention, the joint probability density between two pixel points with different position relationships in the grayscale image is used to reflect the distribution characteristics of the brightness value in the grayscale image, which can reflect the comprehensive information about the direction, adjacent intervals and change amplitude in the grayscale image, and embody the arrangement, local features and position structure of the image, thereby reflecting the state information contained in the current curve and the stroke curve; and because the grayscale probability matrix is ​​relatively large, generally N*N, where N is the grayscale value level and takes 256, various features representing the grayscale probability matrix can be further extracted to form grayscale features.

[0051] Preferably, the probabilistic neural network model is divided into an input layer, a pattern layer, a summation layer and an output layer in sequence; the input layer inputs the grayscale features of the circuit breaker to be detected, the number of neurons in the pattern layer is the same as the total number of training samples, the number of neurons in the summation layer is the same as the number of fault types, and the output layer outputs the fault type with the largest value in the summation layer as the diagnosis result.

[0052] The probabilistic neural network in the present invention is a feedforward neural network with a simple structure, good classification effect and no local optimal value problem. The number of neurons in the input layer is the number of dimensions of the grayscale feature. The grayscale feature of the circuit breaker to be detected is input into the pattern layer from the input layer as the sample to be detected, and the matching degree between the sample to be detected and each training sample in the pattern layer is calculated (the training sample can be the fault information data of the same type of circuit breaker collected historically), and the probability of the sample to be detected belonging to the fault type is calculated in the summation layer according to the matching degree between all training samples corresponding to each fault type and the sample to be detected, and the fault type with the highest probability is output in the output layer as the recognition result.

[0053] The present invention has the following beneficial effects: the functions of circuit breaker mechanical characteristic test, circuit breaker secondary circuit test and circuit breaker circuit resistance test are integrated into the same device, and the circuit breaker test can be performed only by completing the wiring between the circuit breaker and the comprehensive test device, which is convenient to operate and the test result is accurate and is not affected by the level of personnel; the heavy-duty connector and the circuit breaker are connected by a dedicated conversion line, and the corresponding conversion line can be selected according to the type of circuit breaker for connection, and there is no need to manually test one by one on the line according to the definition of the circuit breaker port, so that fast operation and testing can be achieved; in the secondary detection module, the circuit breaker is connected by controlling and switching the relay array to perform the on-off test of each auxiliary circuit, and there is no need to manually perform the wiring switching operation, which is more convenient and quick; the detection results and data can be uploaded to the server through the communication module or the U disk, and the diagnosis and analysis of the circuit breaker is performed based on the collected data, so as to avoid the operator's misjudgment and improve the accuracy of the detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a schematic diagram of a comprehensive testing device for a high voltage circuit breaker of the present invention;

[0055] Figure 2 is a schematic diagram of the first part of the main control module in an embodiment of the present invention;

[0056] Figure 3 is a schematic diagram of the second part of the main control module in an embodiment of the present invention;

[0057] Figure 4 is a schematic diagram of the third part of the main control module in an embodiment of the present invention;

[0058] Figure 5 is a schematic diagram of the first part of the operating power module in an embodiment of the present invention;

[0059] Figure 6 is a schematic diagram of the second part of the operating power module in an embodiment of the present invention;

[0060] Figure 7is a schematic diagram of a secondary detection module in an embodiment of the present invention;

[0061] Figure 8 is a schematic diagram of an auxiliary power supply module in an embodiment of the present invention;

[0062] Fig. 9 is a schematic diagram of the first part of the jump sampling module in an embodiment of the present invention;

[0063] Fig.10 is a schematic diagram of the second part of the jump sampling module in an embodiment of the present invention;

[0064] Fig.11 is a schematic diagram of a port protection module in an embodiment of the present invention;

[0065] Fig.12 is a schematic diagram of an indicator light module in an embodiment of the present invention;

[0066] Fig.13 is a schematic diagram of a stroke testing mechanism in an embodiment of the present invention;

[0067] Fig.14 is a schematic diagram of a panel in an embodiment of the present invention;

[0068] Fig.15 is a schematic diagram of a first dedicated conversion line in an embodiment of the present invention;

[0069] Fig.16 is a schematic diagram of a second dedicated conversion line in an embodiment of the present invention;

[0070] Fig.17 is a schematic diagram of a third dedicated conversion line in an embodiment of the present invention;

[0071] In the figure: 131, circuit breaker body; 132, universal bracket; 133, clamp; 134, sensor; 135, connecting shaft; 136, circuit breaker arm. DETAILED DESCRIPTION

[0072] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0073] like Figure 1 As shown, a comprehensive test device for high-voltage circuit breaker includes a main control module, which is respectively connected to a power control module, a secondary detection module, a jump sampling module and an auxiliary power supply module; the secondary detection module is respectively connected to the jump sampling module, the port protection module and the heavy-load connector, and performs switching connection between the port protection module and the heavy-load connector; the auxiliary power supply module is respectively connected to the power control module and the jump sampling module; the port protection module is connected to the time test port, and the power control module is respectively connected to the jump sampling module, the heavy-load connector, the sensor port, the external synchronization port and the return resistance test port.

[0074] The comprehensive test device includes a chassis and a panel that are fixedly connected. A main control module, a power control module, a secondary detection module, a jump sampling module, a port protection module and an auxiliary power supply module are arranged in a cavity formed by the chassis and the panel; a heavy-load connector, a time test port, a sensor port, an external synchronization port and a return resistance test port are fixed on the panel; a main controller is fixed on the back of the panel, and an indicator light, a communication antenna, a display screen, a display screen operation area, a USB interface and a printer are also arranged on the panel.

[0075] The heavy-load connector is connected to the circuit breaker through a dedicated conversion line; the heavy-load connector includes several pairs of voltage output ports and several pairs of auxiliary ports; the voltage output port includes an opening terminal, a closing terminal, a locking terminal and an energy storage terminal; the auxiliary port includes an opening auxiliary terminal, a closing auxiliary terminal, an energy storage auxiliary terminal, a test auxiliary terminal and an operation auxiliary terminal, which are connected to the secondary auxiliary circuit of the circuit breaker for on-off status testing.

[0076] The secondary detection module includes several groups of multi-stage channel switching units; in the multi-stage channel switching units, the moving contact of the double-pole double-throw relay of the first stage is connected to a pair of on-off test terminals in the jump sampling module, the normally closed contact is connected to a pair of time test terminals of the port protection module, and the normally open contact is connected to the moving contact of the double-pole double-throw relay of the next stage; the normally closed contact of the double-pole double-throw relay of the i-th stage is connected to the moving contact of the double-pole double-throw relay of the next stage, and the normally open contact is connected to a pair of auxiliary ports of the heavy-duty connector; the normally open contact and the normally closed contact of the double-pole double-throw relay of the last stage are respectively connected to a pair of auxiliary ports; the coil of the relay of each stage is connected to the relay drive circuit of its corresponding stage.

[0077] The port protection module includes a plurality of protection units, in which two ends of a first TVS tube in the protection unit are respectively connected to a pair of time test ports through a wiring terminal, one end of the first TVS tube is respectively connected to one end of the second TVS tube, one end of the first capacitor and one end of the first resistor, the other end of the first TVS tube is respectively connected to one end of the third TVS tube, one end of the second capacitor and one end of the second resistor, the other end of the second TVS tube, the other end of the third TVS tube, the other end of the first capacitor and the other end of the second capacitor are connected to one end of the third capacitor and are grounded, the other end of the third capacitor is respectively connected to the other end of the first resistor and the other end of the second resistor; the two ends of the first TVS tube are a pair of time test ends.

[0078] The jump sampling module includes a plurality of groups of port jump units, one end of a pair of on-off test ends in the port jump unit is connected to the sampling voltage through a filtering circuit, and the other end is connected to the source of the first MOS tube, the gate of the first MOS tube is provided with a gate voltage by the sampling voltage, and the drain of the first MOS tube is grounded through a sampling test resistor; the voltage signals at both ends of the sampling test resistor are respectively input into the first negative phase input end and the second negative phase input end of the dual comparator, the sampling voltage is respectively connected to the first positive phase input end and the second positive phase input end of the dual comparator through a first voltage divider circuit and a second voltage divider circuit, the first output end of the dual comparator is connected to the input end of the first optical coupler, the second output end of the dual comparator is connected to the input end of the second optical coupler, and the output end of the first optical coupler and the output end of the second optical coupler input the on-off signal into the main control module.

[0079] The jump sampling circuit also includes two groups of voltage trigger units. In each group of voltage trigger units, the input end of the rectifier bridge is connected to a pair of trigger ends, the output end of the rectifier bridge is connected to the source of the second MOS tube, the gate voltage of the second MOS tube is provided by the trigger voltage, and the drain of the second MOS tube is grounded through a trigger test resistor; the voltage signal at both ends of the trigger test resistor is input to the first negative phase input end of the dual comparator, the trigger voltage is connected to the first positive phase input end of the dual comparator through a trigger voltage divider circuit, the first output end of the dual comparator is connected to the input end of the optocoupler, and the output end of the optocoupler inputs and outputs the trigger signal to and from the main control module; the two pairs of trigger ends are connected to the separation and combination output of the power control module and the external trigger switching circuit.

[0080] The power control module includes a power switch circuit, which is respectively connected to the operating power circuit, the loop resistance circuit and the locking power circuit; the loop resistance circuit is connected to the return resistance test port; the operating power circuit and the external resistance measurement circuit are connected to the opening end and the closing end of the heavy-load connector through the first output switching circuit, and the locking power circuit and the external resistance measurement circuit are connected to the locking end and the energy storage end of the heavy-load connector through the second output switching circuit to switch between voltage output and external resistance measurement.

[0081] The power control module also includes a signal input switching circuit, the output end of the signal input switching circuit is connected to the input end of the isolation sampling circuit in the main control module, and the input end of the signal input switching circuit is respectively connected to the operating power circuit, the loop resistance circuit, the locking power circuit and the sensor port to switch different measurement signals.

[0082] The operating power supply circuit includes an operating power supply U16, wherein the first positive voltage end of U16 is respectively connected to the collector of the IGBT tube Q12 and the collector of the IGBT tube Q14, two TVS tubes connected in series are connected between the collector and the emitter of Q12, two TVS tubes connected in series are connected between the collector and the emitter of Q14, a gate-off control output circuit is connected between the gate and the emitter of Q12, and a gate-on control output circuit is connected between the gate and the emitter of Q14; the first negative voltage end of U16 is connected to the cathode of the diode D118, the connection line of the anode of the diode D118 passes through the Hall sensor, and is connected to the first output switching circuit with the emitter of Q12 as the gate-off output end; the connection line of the anode of the diode D118 passes through the Hall sensor, and is connected to the first output switching circuit with the emitter of Q14 as the gate-on output end, and the output voltage of the Hall sensor is input into the signal input switching circuit.

[0083] The main control module includes two isolation sampling circuits, and the measurement signal of the input isolation sampling circuit is input into the main controller after passing through the first amplification circuit, the second level adjustment amplification circuit, the AD conversion circuit and the digital isolation circuit in sequence; the second level adjustment amplification circuit includes an operational amplifier, and two capacitors are connected in series between the first capacitor terminal and the second capacitor terminal of the operational amplifier, and the connection point of the two capacitors is connected to the negative amplification voltage; the positive phase input terminal of the operational amplifier is connected to the output terminal of the first amplification circuit, and the positive amplification voltage is input to the power supply terminal of the operational amplifier; the output terminal of the operational amplifier is connected to the input terminal of the AD conversion circuit, and is also connected to the moving contact of the first relay, the normally closed contact of the first relay is connected to the moving contact of the second relay, and the normally open output terminal of the first relay is connected to the moving contact of the third relay; the normally closed contact of the second relay is connected to the negative phase input terminal of the operational amplifier, and the normally open contact of the second relay, the normally closed contact of the third relay, and the normally open contact of the third relay are respectively connected to the negative phase input terminal of the operational amplifier through resistors with different resistance values; the coil of each relay is connected to its corresponding relay drive circuit.

[0084] The main control module includes a main controller, which is connected to the indicator light module, communication unit, display screen and operation unit, USB unit and printer unit. Fig.12 The indicator light module shown includes an opening indicator light, a closing indicator light, an unlocking indicator light, an energy storage indicator light, a communication indicator light, a Bluetooth indicator light and a status indicator light.

[0085] The auxiliary power supply module includes several transformers, and the two ends of the primary coil of each transformer are respectively connected to the source of the third MOS tube and the source of the fourth MOS tube, and the middle tap of the primary coil is connected to the main voltage; a resistor and a capacitor are connected in series between the sources of the two MOS tubes, the gate of the third MOS tube receives the first control signal of the chip U32, and the gate of the fourth MOS tube receives the second control signal of the chip U32; each transformer includes several secondary coils, and each secondary coil is connected to a linear voltage stabilization circuit to provide different voltage input jump sampling modules, power supply control modules and main control modules.

[0086] like Fig.13 As shown, the sensor port is connected to the sensor of the stroke test mechanism. The stroke test mechanism includes a universal bracket 132 that can be opened and closed and rotated. One end of the universal bracket 132 is rotatably connected to the circuit breaker body 131, and the other end is rotatably connected to the clamp 133. The clamp 133 is connected to the crank arm 136 of the circuit breaker through a connecting shaft 135. A sensor 134 is fixed on the clamp, and an angle sensor is used on the crank arm circuit breaker.

[0087] The high-voltage circuit breaker comprehensive test device of the present invention integrates the circuit breaker mechanical characteristic test, circuit breaker secondary circuit detection and circuit breaker loop resistance test functions. On the basis of only being able to perform the circuit breaker mechanical characteristic test, the switching and on-off detection of different secondary auxiliary circuits are realized through the jump sampling module, the secondary detection module and the heavy-duty connector connected to the circuit breaker; at the same time, the loop resistance detection is performed through the return resistance test port and the loop circuit in the power control module; therefore, it is only necessary to complete the connection between each port on one device and the circuit breaker to automatically perform various items of circuit breaker detection according to the set conditions. The operation is convenient and the detection result is accurate and is not affected by the professional level and experience of the personnel.

[0088] In the present invention, since there are many types of actual circuit breakers and the definition settings of the interface terminals of the circuit breakers are also different, corresponding dedicated conversion lines are set according to the most common types of circuit breakers to connect the heavy-load connector and the circuit breaker. The terminal correspondence problem between the heavy-load connector and the circuit breaker interface is solved directly through the dedicated connecting line, and there is no need for personnel to connect the wires one by one according to the drawings, which is more convenient to operate.

[0089] The secondary detection module in the present invention tests the on-off state of each auxiliary circuit of the secondary circuit of the circuit breaker through the control and switching of the relay array. The auxiliary ports connected to each double-pole double-throw relay are different. Since no current passes through the relay coil when the relay drive circuit is not driven, the moving contact of the relay is connected to the normally closed contact. Therefore, when it is necessary to detect the on-off state of a pair of auxiliary ports, it is only necessary for the relay drive circuit to control the relay coil connected to the auxiliary port to pass current for attraction, thereby connecting the moving contact to the normally open contact, so that the pair of auxiliary ports are connected to the port jump unit through the corresponding on-off test terminal of the relay array for on-off detection; for the auxiliary port connected to the last-stage relay, the drive of the relay drive circuit can be controlled according to whether it is connected to the normally open contact or the normally closed contact; at the same time, the secondary detection module can also be switched to detect the connectivity state of the time test port.

[0090] In the present invention, a port protection module is provided to protect the circuit in the device. During the detection process of the opening and closing operation, since the time process of connection and disconnection is extremely short, the transient interference caused by the rapid connection and disconnection at the time test port will affect and damage the circuit in the device. Therefore, a protection unit circuit composed of a transient suppression diode TVS tube and a capacitor is provided to ensure that the subsequent circuit is protected from damage due to the impact of transient high energy.

[0091] In the present invention, when the auxiliary circuit is not turned on, the on-off test end does not form a path, the voltage across the sampling test resistor is 0, and the dual comparator output is a high level; when the auxiliary circuit is turned on, the on-off test end forms a path, there is voltage across the sampling test resistor, and the dual comparator output flips, so that the on-off condition of the auxiliary circuit can be judged; in addition, the design of the port jump unit circuit of the present invention uses current as a trigger signal. Only when the current in the circuit is greater than a certain value, the dual comparator will output a jump state and transmit it to the main control module through an optical coupler. Compared with the voltage triggering method of the existing technology center through a resistor plus an optical coupler, it can avoid the interference caused by static electricity on site and improve the accuracy of the test result.

[0092] In addition to several groups of completely electrically isolated port jump units, the jump sampling module of the present invention is also provided with two groups of voltage trigger units, which are trigger circuits for testing internal operating power and external synchronization signals, and provide a time starting point for the test process; in addition, the circuit of the second half of the voltage trigger unit is basically the same as the circuit of the port jump unit, and its purpose is also to avoid interference caused by static electricity on site and improve the accuracy of test results and trigger time.

[0093] The power control module in the present invention has two power supplies, one is the operating power supply in the operating power circuit, and the other is the loop resistance test constant current source in the loop resistance circuit, which is used to supply power for various tests in the comprehensive test device.

[0094] The signal input switching circuit in the present invention also uses a multi-stage double-pole double-throw relay for switching operation, and can switch and select energy storage voltage measurement, sensor measurement, locking voltage measurement, operating current and voltage measurement, external current and voltage measurement, and return resistance current and voltage measurement and input them into the isolation sampling circuit to sample and process the signal.

[0095] The operating power supply circuit in the present invention can generate a circuit breaker operating coil operating power supply with adjustable voltage, and the output is controlled by a high-power IGBT tube, thereby avoiding the arcing phenomenon caused by cutting off the power output when using a relay to control the output; at the same time, a Hall sensor is used to detect the operating current signal in the operating power supply circuit and input it into the signal input switching circuit; in addition, both the opening control output circuit and the closing control output circuit are controlled by optical coupling emitter output, and the fast opening speed and slow closing speed are conducive to ensuring the safe shutdown of the IGBT tube.

[0096] The isolated sampling circuit in the present invention can simultaneously sample signals such as voltage, current and sensor, and is composed of an operational amplifier, a high-speed AD converter, a precision source and a digital isolation chip. At the same time, the channel is configured with X1, X10, and X100 amplification channels. By controlling the relay in the second level-adjusting amplifier circuit to perform amplification of different multiples, AC signals can also be sampled. The chopper-stabilized operational amplifier is characterized in that the offset voltage is very low, only at the microvolt level. Since the signals during loop resistance testing and other signal testing are very small, only a few millivolts at the minimum, the offset of ordinary operational amplifiers is relatively large, which will affect the measurement accuracy. Therefore, the use of a chopper-stabilized operational amplifier is beneficial to signal acquisition in the present invention.

[0097] The indicator light module in the present invention can indicate the current working status, the communication unit can wirelessly send the data collected by the comprehensive detection device to the background server or the cloud for data aggregation, and subsequent comprehensive judgment and circuit breaker diagnosis; the display screen and the operation unit can perform detection settings of the comprehensive detection device, the USB unit can save the data to a U disk for transfer, and the printer unit can print the detection data and the waveform.

[0098] The comprehensive test device in the present invention is a box body, which is composed of a chassis and a panel fixedly connected. All functional modules are arranged in the chassis, and a flap is arranged on the panel to facilitate the movement and placement of the entire device. At the same time, all ports in the comprehensive test device that need to be connected to the circuit breaker are arranged on the panel to facilitate connection during detection. Ventilation holes are also arranged on the chassis to dissipate heat and avoid excessive temperature when the comprehensive test device is working.

[0099] In the present invention, the auxiliary power supply circuit first uses a push-pull offline switching power supply circuit to convert a set of input main voltages into many sets of voltage outputs, and realizes electrical isolation of each auxiliary power supply through the multi-winding output of the transformer to avoid cross-connection when connected to each other, and then uses a linear voltage regulator in each output to convert these voltage-inconstant outputs into stable voltages of various voltage levels required by the circuit; the use of a switching power supply circuit can save the multi-winding power frequency transformer, reducing the volume and weight.

[0100] The speed characteristic of the circuit breaker in the present invention is achieved by synchronously connecting the transmission shaft of the circuit breaker with an externally installed sensor, so that the action process of the circuit breaker will be converted into an electrical signal through the sensor, and through timed sampling, a set of data streams will be formed and drawn into s / t, v / t waveform diagrams. The sensor converts the straight line or rotation process into a linear resistance change for testing.

[0101] A comprehensive testing method for a high voltage circuit breaker, comprising:

[0102] Connect the time test port to the moving contact and static contact of the circuit breaker, use the special adapter cable corresponding to the circuit breaker model to connect the secondary auxiliary circuit of the circuit breaker and the heavy-duty connector, connect the sensor port to the sensor of the stroke test mechanism, and connect the return resistance test port to the primary main circuit of the circuit breaker;

[0103] Conduct on-off detection of the secondary auxiliary circuit; control the circuit breaker to perform opening and closing actions, conduct operating coil characteristic tests, time characteristic tests, and speed characteristic tests to obtain mechanical characteristic results; use the four-terminal connection method to obtain loop resistance test results;

[0104] The current curve of the coil characteristic test and the stroke curve of the speed characteristic test during the opening and closing action are obtained to comprehensively diagnose the circuit breaker.

[0105] The on-off detection of the secondary auxiliary circuit includes:

[0106] The operating circuit breaker is in the waiting state. For any pair of auxiliary ports, the main control module controls the double-pole double-throw relay connected to the pair of auxiliary ports to energize, so that the moving contact is connected to the normally open contact, and the pair of auxiliary ports is connected to the port jump unit through the corresponding pair of on-off test terminals to detect the on-off of the secondary auxiliary circuit where the pair of auxiliary ports are located; the on-off detection of all secondary auxiliary circuits is completed in sequence according to the same operation.

[0107] The mechanical characteristic results are obtained by performing the operating coil characteristic test, the time characteristic test and the speed characteristic test, and judging whether the circuit breaker is in a normal working state according to the preset judgment conditions, and if not, an alarm is issued.

[0108] The comprehensive process of circuit breaker diagnostics includes:

[0109] Discretize the current curve and the stroke curve, and multiply one of the discretized data as a row and the other as a column to obtain a numerical matrix. Normalize the numerical matrix and map it to the brightness value interval [0,255] to generate a grayscale image.

[0110] Since a complete opening and closing process takes between a few tenths of a second and several seconds, and the opening and closing operations of the circuit breaker are all in milliseconds, the discrete time interval can be set to 1 millisecond, that is, the signal is sampled once every 1 millisecond to obtain the discrete point signal {x n +, and then normalize:

[0111]

[0112] The value in the range of [0,1] is obtained. Since the brightness value of the grayscale image is between [0,255], the normalized data can be multiplied by 255 to enlarge it to the brightness value range of the image to generate the corresponding grayscale image.

[0113] The texture information in the grayscale image is extracted to obtain the grayscale features, and the probabilistic neural network model is trained to obtain the fault diagnosis model; the fault diagnosis model is used to diagnose the circuit breaker fault and determine the fault type.

[0114] The process of obtaining grayscale features includes: calculating the probability P(i,j,θ,d) of the point O1(x1,y1) with grayscale value i and the point O2(x1+a(θ,d),y1+b(θ,d)) with grayscale value j appearing when the distance is d in the given angle direction of θ in the grayscale image; and arranging all probabilities P into a square matrix with the grayscale value of point O1 as the row and the grayscale value of point O2 as the column to obtain a grayscale probability matrix; in actual operation, four angle directions of 0 degrees, 45 degrees, 90 degrees and 135 degrees can be selected, and the interval distance is 1 to calculate each grayscale probability matrix.

[0115] The clarity feature, local change feature, energy feature and entropy feature in the grayscale probability matrix are extracted to form grayscale features. For the grayscale probability matrix, the features are extracted:

[0116] Clarity Features:

[0117]

[0118] Local change characteristics:

[0119]

[0120] Energy characteristics:

[0121]

[0122] Entropy characteristics:

[0123]

[0124] Correlation characteristics:

[0125]

[0126]

[0127]

[0128]

[0129]

[0130] Among them, μ1, μ2, d1 and d2 are the mean and standard deviation of the grayscale probability matrix in rows and columns, so that the final grayscale features [CON, H, AE, Ent, Cor, μ1, μ2, d1, d2] with a total of nine dimensions can be obtained.

[0131] The probabilistic neural network model is divided into input layer, pattern layer, summation layer and output layer in sequence; the input layer inputs the grayscale features of the circuit breaker to be detected, the number of neurons in the pattern layer is the same as the total number of training samples, the number of neurons in the summation layer is the same as the number of fault types, and the output layer outputs the fault type with the largest value in the summation layer as the diagnosis result.

[0132] In the probabilistic neural network model, the grayscale features of the input layer are first combined with the weighting coefficient ω i Multiply to get the scalar product Z i Pass it to the model layer and select exp((Z i -1) / σ 2 ) as the activation function, the probability of the jth neuron output of the i-th fault type in the pattern layer is:

[0133]

[0134] Where p is the dimension of the grayscale feature, that is, the dimension of the training sample and the sample to be tested; σ is the smoothing factor; X ij is the corresponding vector of the jth training sample of the i-th fault type, (XX ij ) T (XX ij ) is used to represent the Euclidean distance between the sample to be detected and the fault sample. In the summation layer, for the i-th fault type, there is L i There are Q types of faults (including loose connection pins, loose connection bolts, stuck closing release, stuck operating mechanism, insufficient coil voltage, stuck auxiliary coil contacts, and normal state, etc.). The probability f of the output of the i-th fault type in the summation layer isi The average output of neurons belonging to the same category in the pattern layer is obtained:

[0135]

[0136] The output layer selects the fault type with the largest probability value in the summation layer as the final diagnosed circuit breaker fault type.

[0137] In the present invention, the comprehensive test device and the circuit breaker are first connected, and then various characteristic tests of the circuit breaker are performed. The mechanical characteristic test of the circuit breaker is basically consistent with the prior art and is therefore not described. For the loop resistance test of the circuit breaker, a four-terminal connection method is used to load a constant DC current at both ends of the loop resistance to be tested, and then the voltage drop of the constant current source on the resistor is tested at the lead closest to the resistor end, so that the size of the resistor to be tested is calculated according to Ohm's law; since the comprehensive test device of the present invention includes not only mechanical characteristic test and loop resistance test, but also secondary circuit detection function, the through-end detection of the secondary auxiliary circuit can also be performed; the above-mentioned characteristic tests ultimately display numerical results, which need to be comprehensively considered to judge the state of the circuit breaker. The evaluation results are relatively rough, so the circuit breaker diagnosis can be further performed according to the current curve and stroke curve collected during the characteristic test to obtain more accurate results.

[0138] The present invention summarizes that the through-end detection of the secondary auxiliary circuit involves three parts: a secondary detection module, a jump sampling module and a heavy-duty connector. The heavy-duty connector is connected to the terminals of the circuit breaker interface to form pairs of auxiliary ports, and the secondary detection module switches and selects the port to be detected and connects it to the port jump unit of the jump sampling module for through-end detection, and controls the relay according to the relay drive circuit to complete the switching detection of all auxiliary ports, thereby obtaining the on-off detection result of the secondary auxiliary circuit of the circuit breaker.

[0139] In the present invention, the mechanical characteristic test result is compared with the preset judgment condition to determine whether the circuit breaker is in a normal state. If it is normal, the circuit breaker continues to work. If it is abnormal, an alarm is issued and the specific problem of the circuit breaker is further diagnosed.

[0140] In the present invention, the status information of the circuit breaker is included in both the current curve and the travel curve, and there are differences in the status information included in different curves. Therefore, it is necessary to combine the current curve and the travel curve to diagnose the circuit breaker so as to improve the accuracy of the diagnosis result; and because the complete opening and closing process of the circuit breaker is relatively short, only between a few tenths of a second and a few seconds, and the jump time is mostly in milliseconds, it is possible to discretize at intervals of one millisecond to obtain current data and travel data of M discrete points arranged in chronological order, and combine the two to convert them into an M*M grayscale image, so that one image contains all the status information of the current curve and the travel curve, and then perform feature extraction on the grayscale image, and extract corresponding grayscale features according to the texture features of the grayscale image to perform fault diagnosis of the circuit breaker.

[0141] In the present invention, the joint probability density between two pixel points with different position relationships in the grayscale image is used to reflect the distribution characteristics of the brightness value in the grayscale image, which can reflect the comprehensive information about the direction, adjacent intervals and change amplitude in the grayscale image, and embody the arrangement, local features and position structure of the image, thereby reflecting the state information contained in the current curve and the stroke curve; and because the grayscale probability matrix is ​​relatively large, generally N*N, where N is the grayscale value level and takes 256, various features representing the grayscale probability matrix can be further extracted to form grayscale features.

[0142] The probabilistic neural network in the present invention is a feedforward neural network with a simple structure, good classification effect and no local optimal value problem. The number of neurons in the input layer is the number of dimensions of the grayscale feature. The grayscale feature of the circuit breaker to be detected is input into the pattern layer from the input layer as the sample to be detected, and the matching degree between the sample to be detected and each training sample in the pattern layer is calculated (the training sample can be the fault information data of the same type of circuit breaker collected historically), and the probability of the sample to be detected belonging to the fault type is calculated in the summation layer according to the matching degree between all training samples corresponding to each fault type and the sample to be detected, and the fault type with the highest probability is output in the output layer as the recognition result.

[0143] In the embodiment of the present invention, the comprehensive test device includes a box and a panel, and is connected to the circuit breaker through various ports on the panel, such as Fig.14 As shown, the panel is equipped with a heavy-load connector, a time test port, indicator lights for displaying the working status (including 7 indicator lights: opening, closing, unlocking, energy storage, communication, Bluetooth and status), a back-impedance test port, a sensor port, an external synchronization port, an antenna port, a USB port, a printer, a display screen, a display screen operation area (including a rotating mouse, a menu and a cancel button) and a power switch, etc.

[0144] The device is equipped with a rotating mouse and two buttons to provide human-computer interaction operations. The rotating mouse can move the cursor in the display interface or modify parameters by rotating left and right. The rotating mouse also has a press operation as a confirmation operation. One of the two buttons is a menu key, which is used to call up or hide the menu bar at the bottom of the interface, and the other is a cancel key, which is used to exit the current page and return to the previous page. By using these buttons in combination, it is possible to complete all operations on the interface very conveniently.

[0145] When testing the time characteristics of the circuit breaker, there are 6 ports in total, A1, A2, B1, B2, C1, and C2. Each port consists of two terminals, positive (color) and negative (black). The ports are completely electrically isolated, and various combination tests can be easily performed. When performing secondary detection, the dedicated conversion line is connected to the interface of the secondary circuit of the circuit breaker to realize the opening, closing, energy storage and other operations of the circuit breaker, as well as the measurement of the on-off state of the secondary auxiliary circuit. The loop resistance test includes the large current output terminals I+, I- and the small signal voltage measurement terminals U+, U-, to measure the on-resistance of the main circuit when the circuit breaker is closed. The sensor port is used for the signal input of the speed sensor to test the speed characteristics of the circuit breaker. The external synchronization port is used to input the sampling of the external signal trigger device. There are two signal input channels, opening and closing, with electrical isolation between the channels. Each signal consists of two wires, regardless of positive or negative.

[0146] Since there are many types of circuit breakers, different manufacturers have different interfaces, and the definition of the terminals in the interface is also very complicated, in the past, testers would use drawings to find the corresponding terminals, and then connect them one by one for testing. This is not only prone to errors, but also extremely inefficient. Therefore, a special conversion line is designed, such as Fig.15 , 16 Figures 17 and 18 show the three most common conversion lines for circuit breakers. The corresponding relationship in the figure is the corresponding relationship between the output test of the instrument and the terminals in the secondary circuit of the circuit breaker, which can cover more than 80% of the circuit breakers. In this way, the tester only needs to determine the type of circuit breaker, take out the corresponding conversion line, plug one end into the instrument, and the other end directly into the circuit breaker, and then the operation and test can be quickly realized. The tester does not need to look up the drawings for the corresponding wiring, as the dedicated conversion line has completed this part of the work.

[0147] like Figure 2 , 34 is a circuit diagram of the main control module in this embodiment. The main controller U61 selects STM32F407ZET6, which operates at a main frequency of 168MHz, has a built-in 512KB program storage and 64KB data storage, 144 pins provide a large number of available I / O terminals, 6 USART serial ports, 3 SPI interfaces, 2 I2C interfaces, built-in timers, counters, DMA, PWM generators, A / D converters and D / A converters, and is very powerful.

[0148] The Bluetooth communication uses the HC-05R module, which supports Bluetooth 4.0, digital 2.4GHz wireless transceiver, and adopts CSRBC04 Bluetooth chip technology. It has a small size and low power consumption. It is connected to the controller through the UART port, and the maximum transmission rate can reach 115200bps.

[0149] The clock chip U65 uses PCF8563, which is an industrial-grade multi-function clock / calendar chip with extremely low power consumption and built-in I2C bus interface function. PCF8563's multiple alarm functions, timer functions, clock output functions, and interrupt output functions can complete various complex timing services and provide a watchdog function for the microcontroller.

[0150] The system parameter memory U66 uses AT24C512, which is a 64KB serial electrically erasable programmable memory with 512 pages, each page is 128 bytes, the address of any unit is 16 bits, and the address range is 0000~0FFFFH. It uses an 8-pin package, has the characteristics of compact structure and large storage capacity, and can connect 4 chips in parallel on a 2-wire bus, which is particularly suitable for data acquisition systems with large-capacity data storage requirements.

[0151] STM32F407ZET6 has a built-in SDIO interface, which can be easily connected to the TF card holder U63, so that the system has a self-configurable large-capacity memory, which supports a maximum storage capacity of 32GB and can store at least 10,000 test results. These test results are stored in the TF card in the form of a single file, which can be exported through a USB flash drive, or directly removed from the TF card and put into a card reader for reading, which is very convenient and fast.

[0152] In addition, the design uses the CPLD chip U69 as the controller port expansion, complex logic operations and bus address decoding. EPM570 is a CPLD chip based on a breakthrough new CPLD architecture, providing the lowest cost and minimum power consumption of a single I / O pin among all CPLD series in the industry. By adopting low-power processing technology, the cost is halved, the power consumption is only one-tenth, and it has four times the density and twice the performance. This power-on, non-volatile device series is used in general low-density logic application environments.

[0153] The data storage space inside the main controller is limited, and the maximum available space is only about 192KB. However, the present embodiment needs to collect multiple signals such as voltage, current, jump and sensor in the test, and needs a larger storage space. Therefore, the designed data storage device U68 (external SRAM) selects IS61WV102416BLL chip, which is a high-speed asynchronous CMOS static RAM with a storage space of 2M bytes. It can be read at a high speed of 10ns under a 16-bit bus, which is very suitable for use as a temporary buffer in a high-speed acquisition system. In the design of this device, the jump signal, stroke, and current curve of each channel all need fast sampling, and the data of each sampling point must be quickly stored. The chip is similar to the memory bar of a computer, providing a larger and faster storage buffer for the CPU.

[0154] USB controller U612 uses CH376 driver, which is a universal interface chip of USB bus, supporting USB-HOST host mode and USB-DEVICE / SLAVE device mode. On the local side, CH376 has SPI bus and interrupt output, which can be easily connected to the data port of microcontroller / DSP / MCU / MPU and other controllers, providing a maximum transmission rate of 6Msps.

[0155] The display screen uses LMT056 color LCD screen, which is connected to the main control module through the J64 interface. The screen is 5.6 inches with a resolution of 640*480, supports 65K true color display, built-in TFT controller, 16-bit data bus, supports high-speed refresh of the entire screen, supports display screen rotation, supports X, Y direction address self-addition function, and supports backlight brightness adjustment. The color LCD screen can provide richer and more intuitive interface functions and display effects, high-performance display controller and high-speed refresh capability, and can use GUI display system to make the display interface more diverse, realize WINDOW-like interface style, and make human-computer interaction smoother.

[0156] The printer uses the E22 thermal printer, which is connected to the main control module through the J67 interface, with 384 dots per line and a maximum speed of 60mm / second. The press-type paper slot makes it easier to change the printing paper, and the ultra-high-speed thermal printing does not require a long wait even for continuous printing of waveforms.

[0157] The voltage stabilization circuit where the voltage regulator U615 is located filters and stabilizes the auxiliary power supply input to the main control module. Interfaces J68, J69, J610, J611 and J612 are used to connect the main control module and other modules; U626 and U627 are surface mount Darlington transistors, which are used to convert the control signal of the main controller into the control signal of the relay drive circuit.

[0158] The main control module also includes two isolated sampling circuits, which can simultaneously sample voltage, current, sensor and other signals. The circuit is composed of operational amplifier TLC2652, high-speed A / D converter LTC1864, precision source REF193 and digital isolation chip ADUM2401. At the same time, the channel is configured with X1, X10, X100 amplification channels, and can also sample AC signals.

[0159] In the first isolation sampling circuit, the interface J615 is connected to the output interface J121 of the signal input switching circuit, the CU+ end of J615 is connected to one end of the resistor R628 and one end of the capacitor C651 through the resistor R631, the CU+ end is connected to one end of the capacitor C653 through the diode D65 and grounded, the other end of the capacitor C651 is respectively connected to the negative phase input terminal IN- of the operational amplifier U620 and the output terminal OUT of U620, the other end of the resistor R628 and the other end of the capacitor C653 are connected to the positive phase input terminal of U620, and are connected to the amplified voltages -5 (U) and +5 (U) provided by the auxiliary power supply module through the diode D63, the capacitors C647 and C648 are connected in series between the first capacitor terminal CA and the second capacitor terminal CB of U620, and the negative amplified voltage is connected between the two capacitors.

[0160] The output terminal OUT of the operational amplifier U620 is connected to the positive phase input terminal of the operational amplifier U621 after being filtered by the resistor R629 and the capacitor C652. The capacitors C649 and C650 are connected in series between the first capacitor terminal CA and the second capacitor terminal CB of U621. The negative amplified voltage -5 (U) is connected between the two capacitors. The output terminal OUT of U621 is connected to the moving contact of the relay K64. The normally closed contact of the relay K64 is connected to the moving contact of the relay K62. The normally open contact of the relay K64 is connected to the moving contact of the relay K62. 3, the normally closed contact of relay K62 is connected to the negative phase input terminal of U621 and is grounded through resistor R623; the normally open contact of relay K62 is connected to the negative phase input terminal of U621 through resistor R626 and is grounded through resistor R623; the normally closed contact of relay K63 is connected to the negative phase input terminal of U621 through resistor R625, and the normally open contact of relay K63 is connected to the negative phase input terminal of U621 through resistor R627; the coils of the three relays are respectively connected to the relay drive circuit.

[0161] The output terminal OUT of the operational amplifier U621 is connected to the positive input terminal of the AD conversion chip U619 through the resistor R630, and is connected to the moving contact of the relay K61 and one end of the capacitor C654. The normally open contact of the relay K61 is connected to the power supply +R3 (U) provided by the reference power supply U616 through the resistor R624. The other end of the capacitor C654 is grounded and connected to the positive amplified voltage +5 (U) through a series-connected dual diode D64. The output of the AD conversion chip U619 is output to the main controller U61 of the main control module through the digital isolator U618 (connected to the main controller through the ADU-SCK terminal and the ADU-SDO terminal).

[0162] The structure and component types of the second isolation sampling circuit are exactly the same as those of the first isolation sampling circuit.

[0163] TLC2652 is a high-precision chopper-stabilized operational amplifier. The chopper-stabilized working mode makes the chip have excellent DC characteristics, extremely low offset voltage and drift. The impact of common-mode voltage, low-frequency noise and power supply voltage changes on the operational amplifier is reduced to a minimum, which is very suitable for weak signal amplification circuits. In the test of the circuit breaker loop resistance in the system, the input voltage system is as small as uV, and the use of this type of operational amplifier is very beneficial for signal acquisition.

[0164] The LTC1864 is a micro-power, 16-bit, 250kSPS single-channel analog-to-digital conversion chip. The chip has only 8 simple pins and uses the SPI port line to output the conversion results at high speed. It is very suitable for applications that require high-speed isolated output.

[0165] REF193 is a high-precision and high-stability reference power supply, which outputs a standard voltage of 3V and provides the reference voltage for A / D converters. Its initial accuracy can reach ±2mV, the maximum temperature system accuracy is 5ppm / ℃, and the maximum output current can reach 30mA, which is very suitable for high-precision signal acquisition systems.

[0166] The ADuM2401 is a quad-channel digital isolator. The isolator provides four independent isolation channels and supports a variety of channel configurations and data rates. It operates with a 2.7V to 5.5V power supply voltage, is compatible with low voltage systems, and can implement voltage translation functions across the isolation barrier. In addition, the ADuM2401 features low pulse width distortion (CRWZ level less than 2ns) and tight channel-to-channel matching (CRWZ level less than 2ns).

[0167] like Figure 5 and Figure 6The circuit diagram of the power control module in this embodiment is shown in FIG. 1 . The system uses a dedicated operating power circuit and a loop resistance circuit. The operating power circuit generates a 30-270V adjustable 15A circuit breaker operating coil action power supply, and controls the output through a high-power MOS tube SGH40N60, thereby avoiding the arcing phenomenon caused by cutting off the power output when the relay is used to control the output. The loop resistance circuit generates a 100A or 200A selectable constant current output mode, and the power is output to the primary main circuit of the circuit breaker, and the voltage is measured at both ends of the circuit breaker contacts, thereby calculating the loop resistance when the circuit breaker is in the closed state.

[0168] The operating power supply circuit includes an operating power supply U16, the input end of U16 is connected to the output end of the power switch circuit, the first positive voltage end VOP+ of U16 is respectively connected to the collector of the IGBT tube Q12 and the collector of the IGBT tube Q14, two TVS tubes connected in series are connected between the collector and emitter of Q12, two TVS tubes connected in series are connected between the collector and emitter of Q14, a gate-off control output circuit is connected between the gate GMF end and the emitter SMF end of Q12, and the gate GMH end and the emitter SMH end of Q14 are connected to the gate GMH end and the emitter SMH end of Q14. The closing control output circuit is connected between the terminals; the first negative voltage terminal VOP- of U16 is connected to the cathode of diode D118, and the connection line of the anode of diode D118 passes through the Hall sensor U17, and is connected to the normally open contact of relay K15 with the emitter of Q12 as the opening output terminal; the connection line of the anode of diode D118 passes through the Hall sensor U17, and is connected to the normally open contact of relay K18 with the emitter of Q14 as the closing output terminal, and the output voltage HRI+ of the Hall sensor is input into the signal input switching circuit. The signal output terminals PW0 and DAU1 of U16 are connected to the signal input switching circuit through the interface J112; the emitter of Q12 is connected to the anode of diode D118 through the series-connected diode D111 and resistor R128, and the emitter of Q4 is connected to the anode of diode D118 through the series-connected diode D115 and resistor R18. The normally closed contact of relay K15 is connected to the external resistance measurement circuit through TST0+\TST0- terminals, the normally closed contact of relay K18 is connected to the external resistance measurement circuit through TST1+TST1- terminals, and the moving contact of relay K15 and the moving contact of relay K8 are connected to the opening and closing terminals of the heavy-duty connector through interface J110.

[0169] The opening control output circuit includes an optocoupler U11, the input end of U11 is connected to the main controller U61 through MF, the output end pin 4 of U11 is provided with an opening voltage of +15 (F) by the auxiliary power module, the output end pin 3 is respectively connected to one end of the resistor R11 and one end of the resistor R16, the other end of the resistor R11 is respectively connected to one end of the resistor R12 and the anode of the diode D16 as the GMF end, the other end of the resistor R16 is respectively connected to one end of the resistor R17 and one end of the capacitor C11 and grounded, the cathode of the diode D16 is respectively connected to the other end of the resistor R12, the other end of the resistor R17 and one end of the resistor R13 as the SMF end through the reverse diode D15, the other end of the resistor R13 is connected to the other end of the capacitor C11 and connected to the opening voltage of +15 (F). The structure and components of the closing control output circuit are the same as those of the opening control output circuit, connected to the main controller U61 through the MH end, and provided with a closing voltage of +15 (H) by the auxiliary power module.

[0170] The opening and closing output and external trigger switching circuit include relay K11 and relay K12. The moving contact of relay K11 is connected to the OUTF+\OUTF- terminal, the moving contact of relay K12 is connected to the OUTH+\OUTH- terminal, the normally closed contact of relay K11 is connected to the opening terminal of the heavy-duty connector, the normally open contact of relay K11 is connected to the TRIF+\TRIF- terminal, the normally closed contact of relay K12 is connected to the closing terminal of the heavy-duty connector, and the normally open output of relay K1 is connected to the TRIH+\TIH- terminal; the OUTF+\OUTF- terminal and the OUTH+\OUTH- terminal are connected to the jump sampling module through the interface J16, and the TRIF+\TRIF- terminal and the TRIH+\TIH- terminal are connected to the 4-core aviation plug J12 on the panel through the interface.

[0171] In the external resistance measurement circuit, the measurement voltage +12(l) is connected to one end of the inductor L11 and one end of the resistor R124. The other end of the resistor R124 is respectively connected to one end of the resistor R125 and the cathode of the diode D117. The other end of the resistor R125 is connected to the gate of the MOS tube Q13. The anode of the diode D117 is connected to one end of the resistor R127 and grounded. The other end of the resistor R127 is connected to the drain of the MOS tube Q13 as the external voltage measurement terminal MI+. The source of the MOS tube Q13 is connected to the resistor R125 in series. R167 and resistor R166 are connected to the other end of the inductor L11, the other end of the inductor L11 and the source of the MOS tube Q13 are respectively connected to the moving contacts of relays K16, K17, K19 and K110, the normally open contact of relay K16 is connected to TST0+\TST0-end, the normally open contact of relay K17 is connected to TST1+\TST1-end, the normally open contact of relay K19 is connected to TST2+\TST2-end, and the normally open contact of relay K110 is connected to TST3+\TST3-end.

[0172] A simple constant current circuit composed of Q13, D117, and R127 measures the voltage across the external resistance loop and calculates the external resistance based on Ohm's law. This measurement method is only suitable for situations with low accuracy and is mainly used to determine whether there is a short circuit at the operating power supply output port to avoid damage to the power supply during output.

[0173] The signal input switching circuit is connected to the main control module through interfaces J121 and J123. The CU+\G(U) terminal of J121 is connected to the moving contact of relay K115. The connection return resistance voltage measurement terminal US+\US- of K115, the normally open contact of K115 is connected to the moving contact of relay K114, the normally closed contact of K114 is connected to the external voltage measurement terminal MV+\MV-, the normally open contact of K114 is connected to the moving contact of relay K113, the normally closed contact of K113 is connected to the operating voltage measurement terminal VOP+\VOP-, the normally open contact of K113 is connected to the moving contact of relay K112, and the normally closed contact of K112 is connected to the moving contact of relay K112. Connect the energy storage voltage measurement terminal VM+\VN-, the normally open contact of K112 is connected to the sensor signal terminal VE+; the CI+\G(I) terminal of J123 is connected to the moving contact of relay K118, the normally closed contact of K118 is connected to the return current measurement terminal IS+\IS-, the normally open contact of K118 is connected to the moving contact of relay K117, the normally closed contact of K117 is connected to the external current measurement terminal MI+, the normally open contact of K117 is connected to the moving contact of relay K116, the normally closed contact of K116 is connected to the locking voltage measurement terminal VL+\VL-, and the normally open contact of K116 is connected to the voltage output terminal HRI+ of the Hall sensor. The sensor signal terminal VE+ is connected to the 5-core aviation plug J124 on the panel through the interface J122, that is, the sensor port.

[0174] The operational amplifier U110 and the operational amplifier U111 respectively form the operating voltage regulating circuit and the unlocking voltage regulating circuit. The locking power supply circuit is a set of boost push-pull switching power supply circuits, which generates the DC220V unlocking voltage for the circuit breaker closing operation. The output terminal VL+\G(l) of the locking power supply circuit is connected to the normally open contact of relay K119, and the normally closed contact of K119 is connected to the external resistance measurement circuit through the TST2+\TST2- terminal. The output terminal L\N of the power switch circuit is connected to the normally closed contact of relay K121, and the normally open contact of K121 is connected to the VOP+\VOP- terminal of the operating power supply circuit. The moving contact of K121 is the energy storage voltage measurement terminal VM+\VM- connected to the normally open contact of relay K120, and the normally closed contact of relay K120 is connected to the external resistance measurement circuit through the TST3+\TST3- terminal. The moving contact of relay K121 and the moving contact of relay K120 are respectively connected to the locking terminal and the energy storage terminal of the heavy-duty connector through the interface J12.

[0175] like Figure 7 The figure shows the circuit diagram of the secondary detection module in this embodiment. The secondary detection module tests the on-off status of each auxiliary circuit of the secondary circuit of the circuit breaker through the control and switching of the relay array, and supports the detection of up to 28 signals. The system outputs the status of each auxiliary circuit detected on the display screen and automatically determines whether the status is normal. The mobile 4G module U22 selects WH-LTELTELTE-7S, which takes "transparent transmission" as the core function and adopts a double-row pin packaging form for high ease of use. Users can easily and quickly integrate it into their own system. The module software has complete functions and covers most conventional application scenarios. Users can realize two-way transparent transmission of serial port to network data through simple settings. It also supports custom registration packages, heartbeats and other functions, supports 2-way Socket SocketSocketSocketSocket connection, and supports httpdhttpdhttpdhttpd and other protocol communications. It has the characteristics of high speed and low latency. It has the characteristics of high speed and low latency.

[0176] J23 is a heavy-duty connector terminal on the panel and is the only interface for the circuit output inside the device. The terminal pairs corresponding to the opening terminal, closing terminal, locking terminal, energy storage terminal and various auxiliary ports are given in the figure. The opening terminal, closing terminal, locking terminal and energy storage terminal are the voltage output terminals for the device to output the corresponding operation of the circuit breaker, and the remaining auxiliary ports are used for the on-off test of the secondary auxiliary circuit.

[0177] The relay array includes six multi-level channel switching units, corresponding to six pairs of on-off test terminals LA1+\LA1-, LA2+\LA2-, LB1+\LB1-, LB2+\LB2-, LC1\LC1- and LC2+\LC2- connected to the jump sampling module through interfaces J21 and J22, and also corresponding to six pairs of time test terminals A1+\A1-, A2+\A2-, B1+\B1-, B2+\B2-, C1\C1- and C2+\C2- connected to the port protection module through interfaces J24 and J25.

[0178] The connection method for each multi-level channel switching unit is the same, but the number of levels is different. The following is an example of a multi-level channel switching unit where the LC1+\LC1-end and the C1+\C1-end are located. The LC1+\LC1-end is connected to the moving contact of the double-pole double-throw relay K24, the normally closed contact of K24 is connected to the C1+\C1-end, the normally open contact of K24 is connected to the moving contact of the double-pole double-throw relay K25, the normally closed contact of K25 is connected to the moving contact of the double-pole double-throw relay K23, the normally open contact of K25 is connected to the disconnection auxiliary channel 1 corresponding to CP-3\CP-19 (it can also be another pair of auxiliary channels), the normally closed contact of K23 is connected to the moving contact of the double-pole double-throw relay K22, and the normally open contact of K23 is connected to the disconnection auxiliary channel 2 corresponding to CP-51\CP-35 (it can also be another pair of auxiliary channels). The normally closed contact of K22 is connected to the moving contact of the double-pole double-throw relay K21, the normally open contact of K22 is connected to the auxiliary channel 3 of CP-4\CP-20 (or other auxiliary channels), the normally closed contact of K21 is connected to the auxiliary channel 4 of CP-52\CP-36 (or other auxiliary channels), the normally open contact of K21 is connected to the auxiliary channel 5 of CP-5\CP-21 (or other auxiliary channels), the coils of relays K24, K25, K23, K22 and K21 are connected to their own relay drive circuits to control the closing or disconnection of the relays. A total of six multi-level channel switching units can complete the on-off detection of 28 pairs of auxiliary channel ports.

[0179] like Figure 8 The figure shows the circuit diagram of the auxiliary power module in this embodiment. In this embodiment, each part of the device requires isolated power supplies of various voltages and powers, especially the port jump unit, which requires up to 12 auxiliary power supplies. In order to meet this requirement, the device uses the SG3525 PWM control chip U32, and adopts a design method combining a push-pull offline switching power supply and a linear regulator. A set of +5V main power supplies are converted into more than a dozen stable voltage sources with different voltages, which are provided to various circuits. The design is efficient and reliable.

[0180] The first output terminal OUTB of the PWM control chip U32 is connected to the gate of the MOS tube Q31 and the cathode of the diode D35 through the resistor R31, the anode of the diode D35 is connected to the drain of the MOS tube Q31 and grounded, and the source of the MOS tube Q31 is connected to one end of the resistor R37 and connected to one end of the primary coil of the transformer T31; the second output terminal OUTA of U32 is connected to the gate of the MOS tube Q32 and the cathode of the diode D37 through the resistor R33, the anode of the diode D37 is connected to the drain of the MOS tube Q32 and grounded, the source of the MOS tube Q32 is connected to one end of the resistor C316 and connected to the other end of the primary coil of the transformer T31, the other end of the resistor R37 is connected to the other end of the capacitor C316, and the middle tap of the primary coil of the transformer T31 is connected to the 5V main voltage; the connection method of the primary coils of the remaining transformers T32, T33 and T34 is the same as that of T31.

[0181] The two ends of the secondary coil of the transformer T31 are connected to the input end of the rectifier D32, the positive output end of D32 is respectively connected to the positive electrode of the electrolytic capacitor E33, one end of the capacitor C35 and the input end of the voltage regulator U31 through the inductor L32, the output end of U31 is connected to the positive electrode of the electrolytic capacitor E34 and one end of the capacitor C33 and outputs a voltage of +15 (A1), and the negative output end of D32 is respectively connected to the negative electrode of the electrolytic capacitor E33, the other end of the capacitor C35, the ground end of the voltage regulator U31, the negative electrode of the electrolytic capacitor E34 and the other end of the capacitor C33 and grounded G (A1). 1), +15(A1)\G(A1) is the auxiliary power supply provided to the jump sampling module; +15(A2)\G(A2), +15(B1)\G(B1), +15(B2)\G(B2), +15(C1)\G(C1), +15(C2)\G(C2), +15(F)\G(F), +15(H)\G(H), +15(OF)\G(OF) and +15(OH)\G(OH) are in the same linear voltage regulation circuit; the auxiliary power supply is provided to the jump sampling module and the power control module.

[0182] One end of the secondary coil of transformer T34 is connected to the anode of diode D312 and the cathode of diode D314 respectively, the cathode of diode D312 is connected to the positive electrode of electrolytic capacitor E323, one end of capacitor C332 and the input end of voltage regulator U313, the output end of voltage regulator U313 is connected to the positive electrode of electrolytic capacitor E324 and one end of capacitor C333 and outputs voltage +5 (U), the anode of diode D314 is connected to the negative electrode of electrolytic capacitor E325, one end of capacitor C337 and the input end of voltage regulator U314, the output end of voltage regulator U314 is connected to the positive electrode of electrolytic capacitor E324 and one end of capacitor C333 and outputs voltage +5 (U), The negative pole of capacitor E326 and one end of capacitor C335 output voltage -5 (U). The other end of the secondary coil of T34 is connected to the negative pole of E323, the positive pole of E325, the other end of C332, the other end of C337, the ground end of U312, the ground end of U314, the negative pole of E324, the positive pole of E326, the other end of C333 and the other end of C335 and grounded G (U). The auxiliary power supply of +5 (U) \ G (U) \ -5 (U) is provided to the main control module, and +5 (I) \ G (I) \ -5 (I) is the same.

[0183] like Fig. 9 and Fig.10 The figure shows the circuit diagram of the jump sampling module in this embodiment. In the mechanical characteristic test of the circuit breaker, a very important item is the test of the circuit breaker opening and closing time. The circuit breaker generally has 3-phase ports, and some have 2 ports in series in one phase. The early circuit design for testing port jumps used a resistor plus an optocoupler, but due to severe electrostatic interference in field tests, it would lead to inaccurate test results or even completely abnormal data. In order to improve the anti-interference ability and reliability of the port jump test, the device adopts Fig. 9 and Fig.10 In the circuit design, the comparator LM393 can only output the jump state when the current in the port loop is at least greater than 30mA, and then transmit it to the main controller through the optical coupler TLP521 isolation. The system is designed with 6 fully electrically isolated port jump units, which can be used in any combination outside without affecting each other, greatly facilitating the testing of multi-port loops.

[0184] This jump trigger mode by detecting the current can effectively avoid the interference caused by static electricity on site and improve the accuracy of the test results. In addition, the FQP2N60C high-voltage MOS tube selected in the circuit not only improves the voltage resistance of the test circuit, but also bears all the power consumption generated by the circuit, solving the problem of centralized heat dissipation of the circuit. The TLP521 optocoupler isolation circuit in the back stage isolates the test circuit from the main control circuit, improves the reliability of the circuit, and isolates the influence of external static interference on the display screen.

[0185] Fig. 9Since the component structure and connection relationship of the six-way port jump unit are the same, the port jump unit where the on-off test terminal LA1+\LA1- is located is taken as an example for circuit description. The auxiliary power supply +15 (A1) provided by the power auxiliary module is connected to the positive electrode of the electrolytic capacitor E41, one end of the capacitor C41 and the anode of the diode D41, the negative electrode of the electrolytic capacitor E41 and the other end of the capacitor C41 are connected and connected to G (A1), the cathode of the diode D41 is connected to the on-off test terminal LA1+, and the other on-off test terminal LA1- is connected to the source of the MOS tube Q41 through the resistor R44, the gate of the MOS tube Q41 is respectively connected to one end of the resistor R410, the cathode of the diode D417 and one end of the capacitor C440, the other end of the resistor R410 is connected to +15 (A1), the anode of the diode D417 and the other end of the capacitor C440 are connected and connected to G (A1); the drain of the MOS tube Q41 is connected to the sampling test resistor R45 is connected to G(A1), the drain of Q41 is connected to one end of resistor R411, the other end of resistor R411 is connected to G(A1) through capacitor C43 and diode D42 in parallel, and is connected to the first negative input terminal 1IN- of the dual comparator U42 through resistor R42, and is connected to the second negative input terminal 2IN- of the dual comparator U42 through resistor R46; the auxiliary power supply +15(A1) is connected to one end of resistor R412, one end of resistor R414, one end of capacitor C42 and one end of resistor R49 through resistor R48 respectively, the other end of resistor R412, the other end of R414 and the other end of C42 are connected and connected to G(A1); one end of resistor R49 is connected to the first positive input terminal 1IN+ of the dual comparator U42. The auxiliary power supply +15 (A1) is connected to one end of the resistor R416, one end of the capacitor C45 and one end of the resistor R413 through the resistor R415, and one end of the resistor R413 is connected to the second positive input terminal 2IN+ of the dual comparator U42; the other end of the resistor R49 is connected to the first output terminal 1OUT of the dual comparator U42 and is connected to the input terminal (cathode of the light-emitting diode) of the optocoupler U41 through the resistor R41, the other end of the resistor R413 is connected to the second output terminal 2OUT of the dual comparator U42 and is connected to the input terminal (cathode of the light-emitting diode) of the optocoupler U43 through the resistor R47, and the input terminals (anode of the light-emitting diode) of the optocoupler U41 and the optocoupler U43 are also connected to the auxiliary power supply +15 (A1); the output terminal of the optocoupler U41 inputs the on-off signal into the main control module through the TA1 terminal, and the output terminal of the optocoupler U43 inputs the on-off signal through the TAR1 terminal.

[0186] Fig.10The invention includes two groups of voltage trigger circuits. Since the component structures and connection relationships thereof are the same, only the voltage trigger circuit at the OUTF+\OUTF- terminals connected to the secondary detection module is taken as an example for description. The OUTF+\OUTF- terminals are connected to the rectifier D413, the positive output terminal V+ of the rectifier D413 is connected to the source of the MOS tube Q47, the gate of the MOS tube Q47 is connected to one end of the resistor R4110, the cathode of the diode D423, one end of the resistor R4111 and one end of the capacitor C435; the other end of the resistor R4110 is connected to the auxiliary power supply +15 (OF), the anode of the diode D423, the other end of the resistor R4111 and the other end of the capacitor C435 are grounded G (OF), the other end of the MOS tube Q47 is connected to one end of the resistor R4103 and one end of the resistor R4104, the other end of the resistor R4103 is connected to one end of the capacitor C433, the anode of the diode D414 and the grounding end of the dual comparator U419 and grounded G (OF), the other end of the resistor R4104 is connected to the other end of the capacitor C433, the cathode of the diode D414 and the first negative terminal of the dual comparator U419 Phase input terminal 1IN-, the first positive phase input terminal 1IN+ of the dual comparator U419 is connected to one end of the resistor R4109, one end of the resistor R4108, one end of the capacitor C434 and one end of the resistor R4112; the other end of the resistor R4108 is connected to the positive electrode of the electrolytic capacitor R48, one end of the capacitor C432 and the voltage terminal VCC of the dual comparator U419, the other end of the capacitor C432, the negative electrode of the electrolytic capacitor E48, the other end of the resistor R4112 and the other end of the capacitor C434 are connected and grounded G (OF); the other end of the resistor R4109 is connected to the output terminal OUT of the dual comparator U419, and is connected to the input terminal (cathode of the light-emitting diode) of the optical coupler U420 through the resistor R4106, the input terminal (anode of the light-emitting diode) of the optical coupler U420 is also connected to the auxiliary power supply +15 (OF), and the output terminal of the optical coupler U420 inputs the trigger signal into the main control module through the TOF terminal.

[0187] like Fig.11Shown is a circuit diagram of the port protection module in this embodiment, corresponding to six groups of protection units with six pairs of time test terminals A1+\A1-, A2+\A2-, B1+\B1-, B2+\B2-, C1\C1- and C2+\C2-. The component structure and connection method of each protection unit are the same, so only one group of protection units is taken as an example for explanation. Interface J51 and interface J54 are a pair of time test ports A1, corresponding to the positive end (color) and negative end (black) of the time test port respectively. Interface J51 is connected to one end of TVS tube D54, one end of TVS tube D51, one end of capacitor C51 and one end of resistor R51 as time test end A1+ end. Interface J54 is connected to the other end of TVS tube D54, one end of TVS tube D57, one end of capacitor C57 and one end of resistor R54 as time test end A1- end. The other end of resistor R51, the other end of resistor R54 and one end of capacitor C54 are connected. The other end of capacitor C54, the other end of capacitor C51, the other end of capacitor C57, the other end of TVS tube D51 and the other end of TVS tube D57 are connected and grounded.

[0188] In addition, a cloud or server can be set up on the basis of the comprehensive test device of this embodiment, and the device provides wired and wireless data upload interfaces. The wired interface mainly uploads data through the RS232 serial port and the USB port, and generally uses a USB flash drive to export data files. The wireless interface uses Bluetooth and 4G communication modules for uploading. Bluetooth exports data to a receiving device close to the device; and the 4G communication module uploads data directly to the cloud or server through the mobile Internet. A comprehensive test device can be approximated as a terminal, and each terminal uploads data to the cloud server for aggregation. By classifying and summarizing a large amount of data, a server-side fault diagnosis library is formed, and the circuit breaker can be diagnosed based on historical circuit breaker fault data.

[0189] The above embodiments are further elaborations and illustrations of the present invention for ease of understanding, and are not limitations of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high voltage circuit breaker comprehensive test device, characterized in that: The invention comprises a main control module, wherein the main control module is respectively connected to a power control module, a secondary detection module, a jump sampling module and an auxiliary power supply module; the secondary detection module is respectively connected to a jump sampling module, a port protection module and a heavy-duty connector, and performs switching connection between the port protection module and the heavy-duty connector; the auxiliary power supply module is respectively connected to a power control module and a jump sampling module; the port protection module is connected to a time test port, and the power control module is respectively connected to a jump sampling module, a heavy-duty connector, a sensor port, an external synchronization port and a return resistance test port.

2. A high-voltage circuit breaker comprehensive test device according to claim 1, characterized in that: The heavy-load connector is connected to the circuit breaker through a dedicated conversion line; the heavy-load connector includes a plurality of pairs of voltage output ports and a plurality of pairs of auxiliary ports; the voltage output port includes an opening terminal, a closing terminal, a locking terminal and an energy storage terminal; the auxiliary port includes an opening auxiliary terminal, a closing auxiliary terminal, an energy storage auxiliary terminal, a test auxiliary terminal and an operation auxiliary terminal, which are connected to the secondary auxiliary circuit of the circuit breaker for on-off state testing.

3. A high-voltage circuit breaker comprehensive test device according to claim 1 or 2, characterized in that: The secondary detection module includes several groups of multi-stage channel switching units; in the multi-stage channel switching units, the moving contact of the double-pole double-throw relay of the first stage is connected to a pair of on-off test terminals in the jump sampling module, the normally closed contact is connected to a pair of time test terminals of the port protection module, and the normally open contact is connected to the moving contact of the double-pole double-throw relay of the next stage; the normally closed contact of the double-pole double-throw relay of the i-th stage is connected to the moving contact of the double-pole double-throw relay of the next stage, and the normally open contact is connected to a pair of auxiliary ports of the heavy-duty connector; the normally open contact and the normally closed contact of the double-pole double-throw relay of the last stage are respectively connected to a pair of auxiliary ports; the coil of the relay of each stage is connected to the relay driving circuit of its corresponding stage.

4. A high-voltage circuit breaker comprehensive test device according to claim 3, characterized in that: The port protection module includes a plurality of protection units, wherein two ends of a first TVS tube in the protection unit are respectively connected to a pair of time test ports through a wiring terminal, one end of the first TVS tube is respectively connected to one end of a second TVS tube, one end of a first capacitor and one end of a first resistor, the other end of the first TVS tube is respectively connected to one end of a third TVS tube, one end of a second capacitor and one end of a second resistor, the other end of the second TVS tube, the other end of the third TVS tube, the other end of the first capacitor and the other end of the second capacitor are connected to one end of the third capacitor and are grounded, and the other end of the third capacitor is respectively connected to the other end of the first resistor and the other end of the second resistor; Two ends of the first TVS tube are a pair of time test ends.

5. A high-voltage circuit breaker comprehensive test device according to claim 3, characterized in that: The jump sampling module includes a plurality of groups of port jump units, one end of a pair of on-off test ends in the port jump unit is connected to a sampling voltage through a filtering circuit, and the other end is connected to a source of a first MOS tube, a gate voltage of the first MOS tube is provided by the sampling voltage, and a drain of the first MOS tube is grounded through a sampling test resistor; voltage signals at both ends of the sampling test resistor are respectively input to a first negative phase input end and a second negative phase input end of a dual comparator, the sampling voltage is respectively connected to a first positive phase input end and a second positive phase input end of the dual comparator through a first voltage divider circuit and a second voltage divider circuit, the first output end of the dual comparator is connected to an input end of a first optical coupler, the second output end of the dual comparator is connected to an input end of a second optical coupler, and the output end of the first optical coupler and the output end of the second optical coupler input an on-off signal into a main control module.

6. A high-voltage circuit breaker comprehensive test device according to claim 5, characterized in that: The jump sampling circuit also includes two groups of voltage trigger units. In each group of voltage trigger units, the input end of the rectifier bridge is connected to a pair of trigger ends, the output end of the rectifier bridge is connected to the source of the second MOS tube, the gate of the second MOS tube is provided with a gate voltage by the trigger voltage, and the drain of the second MOS tube is grounded through a trigger test resistor; the voltage signal at both ends of the trigger test resistor is input to the first negative phase input end of the dual comparator, the trigger voltage is connected to the first positive phase input end of the dual comparator through a trigger voltage divider circuit, the first output end of the dual comparator is connected to the input end of the optocoupler, and the output end of the optocoupler inputs and outputs the trigger signal to and from the main control module; the two pairs of trigger ends are connected to the separation and combination output of the power control module and the external trigger switching circuit.

7. A high-voltage circuit breaker comprehensive test device according to claim 1 or 2 or 4 or 5 or 6, characterized in that: The power control module includes a power switch circuit, which is respectively connected to an operating power circuit, a loop resistance circuit and a locking power circuit; the loop resistance circuit is connected to a return resistance test port; the operating power circuit and the external resistance measurement circuit are connected to the opening end and the closing end of the heavy-load connector through a first output switching circuit, and the locking power circuit and the external resistance measurement circuit are connected to the locking end and the energy storage end of the heavy-load connector through a second output switching circuit to switch between voltage output and external resistance measurement.

8. A high-voltage circuit breaker comprehensive test device according to claim 7, characterized in that: The power control module also includes a signal input switching circuit, the output end of the signal input switching circuit is connected to the input end of the isolation sampling circuit in the main control module, and the input end of the signal input switching circuit is respectively connected to the operating power circuit, the loop resistance circuit, the locking power circuit and the sensor port to switch different measurement signals.

9. A high-voltage circuit breaker comprehensive test device according to claim 8, characterized in that: The operating power supply circuit includes an operating power supply U16, wherein the first positive voltage end of U16 is respectively connected to the collector of the IGBT tube Q12 and the collector of the IGBT tube Q14, two TVS tubes connected in series are connected between the collector and the emitter of Q12, two TVS tubes connected in series are connected between the collector and the emitter of Q14, a gate-off control output circuit is connected between the gate and the emitter of Q12, and a gate-on control output circuit is connected between the gate and the emitter of Q14; the first negative voltage end of U16 is connected to the cathode of the diode D118, the connection line of the anode of the diode D118 passes through the Hall sensor, and is connected to the first output switching circuit with the emitter of Q12 as the gate-off output end; the connection line of the anode of the diode D118 passes through the Hall sensor, and is connected to the first output switching circuit with the emitter of Q14 as the gate-on output end, and the output voltage of the Hall sensor is input into the signal input switching circuit.

10. A high voltage circuit breaker comprehensive test device according to claim 1 or 2 or 4 or 5 or 6, characterized in that: The main control module includes two isolation sampling circuits, and the measurement signal input to the isolation sampling circuit is sequentially input to the main controller after passing through the first amplification circuit, the second level adjustment amplification circuit, the AD conversion circuit and the digital isolation circuit; The second level-adjusting amplifier circuit includes an operational amplifier, wherein two capacitors are connected in series between a first capacitor terminal and a second capacitor terminal of the operational amplifier, and a negative amplified voltage is connected to a connection point between the two capacitors; a positive phase input terminal of the operational amplifier is connected to an output terminal of the first amplifying circuit, and a positive amplified voltage is input to a power supply terminal of the operational amplifier; an output terminal of the operational amplifier is connected to an input terminal of an AD conversion circuit, and is also connected to a moving contact of a first relay, wherein a normally closed contact of the first relay is connected to a moving contact of a second relay, and a normally open contact of the first relay is connected to a moving contact of a third relay; a normally closed contact of the second relay is connected to a negative phase input terminal of the operational amplifier, and a normally open contact of the second relay, a normally closed contact of the third relay, and a normally open contact of the third relay are respectively connected to the negative phase input terminal of the operational amplifier through resistors of different resistance values; and a coil of each relay is connected to its corresponding relay driving circuit.

11. A high voltage circuit breaker comprehensive test device according to claim 10, characterized in that: The main control module comprises a main controller, and the main controller is respectively connected to the indicator light module, the communication unit, the display screen and the operation unit, the USB unit and the printer unit.

12. A high voltage circuit breaker comprehensive test device according to claim 11, characterized in that: The comprehensive test device comprises a chassis and a panel that are fixedly connected, and a main control module, a power control module, a secondary detection module, a jump sampling module, a port protection module and an auxiliary power supply module are arranged in a cavity formed by the chassis and the panel; the heavy-load connector, the time test port, the sensor port, the external synchronization port and the return resistance test port are fixed on the panel; the main controller is fixed on the back of the panel, and an indicator light, a communication antenna, a display screen, a display screen operation area, a USB interface and a printer are also arranged on the panel.

13. A high voltage circuit breaker comprehensive test device according to claim 1 or 2 or 4 or 5 or 6, characterized in that: The auxiliary power supply module includes several transformers, and the two ends of the primary coil of each transformer are respectively connected to the source of the third MOS tube and the source of the fourth MOS tube, and the middle tap of the primary coil is connected to the main voltage; a resistor and a capacitor are connected in series between the sources of the two MOS tubes, the gate of the third MOS tube receives the first control signal of the chip U32, and the gate of the fourth MOS tube receives the second control signal of the chip U32; each transformer includes several secondary coils, and each secondary coil is connected to a linear voltage stabilization circuit to provide different voltage input jump sampling modules, power supply control modules and main control modules.

14. A high-voltage circuit breaker comprehensive test device according to claim 1 or 2 or 4 or 5 or 6, characterized in that: The sensor port is connected to the sensor of the stroke testing mechanism, and the stroke testing mechanism includes a universal bracket that can be opened and closed and rotated. One end of the universal bracket is rotatably connected to the circuit breaker body, and the other end is rotatably connected to the clamp. The clamp is connected to the crank arm of the circuit breaker through a connecting shaft, and the sensor is fixed on the clamp.

15. A high-voltage circuit breaker comprehensive testing method, applicable to a high-voltage circuit breaker comprehensive testing device as claimed in any one of claims 1 to 14, characterized in that: include: Connect the time test port to the moving contact and static contact of the circuit breaker, use the special adapter cable corresponding to the circuit breaker model to connect the secondary auxiliary circuit of the circuit breaker and the heavy-duty connector, connect the sensor port to the sensor of the stroke test mechanism, and connect the return resistance test port to the primary main circuit of the circuit breaker; Conduct on-off detection of the secondary auxiliary circuit; control the circuit breaker to perform opening and closing actions, conduct operating coil characteristic tests, time characteristic tests, and speed characteristic tests to obtain mechanical characteristic results; use the four-terminal connection method to obtain loop resistance test results; The current curve of the coil characteristic test and the stroke curve of the speed characteristic test during the opening and closing action are obtained to comprehensively diagnose the circuit breaker.

16. A high voltage circuit breaker comprehensive testing method according to claim 15, characterized in that: The on-off detection of the secondary auxiliary circuit includes: The operating circuit breaker is in the waiting state. For any pair of auxiliary ports, the main control module controls the double-pole double-throw relay connected to the pair of auxiliary ports to energize, so that the moving contact is connected to the normally open contact, and the pair of auxiliary ports is connected to the port jump unit through the corresponding pair of on-off test terminals to detect the on-off of the secondary auxiliary circuit where the pair of auxiliary ports are located; the on-off detection of all secondary auxiliary circuits is completed in sequence according to the same operation.

17. A high voltage circuit breaker comprehensive testing method according to claim 15 or 16, characterized in that: The mechanical characteristic results are obtained by performing the operating coil characteristic test, the time characteristic test and the speed characteristic test, and judging whether the circuit breaker is in a normal working state according to the preset judgment conditions, and if not, an alarm is issued.

18. A high voltage circuit breaker comprehensive testing method according to claim 15, characterized in that: The process of comprehensive circuit breaker diagnosis includes: Discretize the current curve and the stroke curve, and multiply one of the discretized data as a row and the other as a column to obtain a numerical matrix. Normalize the numerical matrix and map it to the brightness value interval [0,255] to generate a grayscale image. The texture information in the grayscale image is extracted to obtain the grayscale features, and the probabilistic neural network model is trained to obtain the fault diagnosis model; the circuit breaker fault is diagnosed through the fault diagnosis model to determine the fault type.

19. A high voltage circuit breaker comprehensive testing method according to claim 18, characterized in that: The process of obtaining the grayscale feature includes: calculating the probability P(i,j,θ,d) of the point O1(x1,y1) with a grayscale value of i and the point O2(x1+a(θ,d),y1+b(θ,d)) with a grayscale value of j appearing; and arranging all the probabilities P into a square matrix with the grayscale values ​​of the point O1 as rows and the grayscale values ​​of the point O2 as columns to obtain a grayscale probability matrix; The clarity feature, local change feature, energy feature and entropy feature are extracted from the grayscale probability matrix to form the grayscale feature.

20. A high voltage circuit breaker comprehensive testing method according to claim 18 or 19, characterized in that: The probabilistic neural network model is divided into an input layer, a pattern layer, a summation layer and an output layer in sequence; the input layer inputs the grayscale features of the circuit breaker to be detected, the number of neurons in the pattern layer is the same as the total number of training samples, the number of neurons in the summation layer is the same as the number of fault types, and the output layer outputs the fault type with the largest value in the summation layer as the diagnosis result.

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