Terminal strip signal detector and detection method thereof

Abstract

The application discloses a terminal strip signal detector and a detection method thereof, and relates to the technical field of terminal strip signal detection. The terminal strip signal detector comprises a control module and a terminal strip plug module, the terminal strip plug module is used for a plurality of connection terminal strip plug holes, and the terminal strip signal detector further comprises a power supply signal detection module and a fault detection module. The terminal strip signal detector and the detection method thereof realize no-switching detection of alternating current power supply, positive direct current power supply and negative direct current power supply through the designed power supply signal detection module, complete full-coverage measurement of a plurality of power supply signals through the designed relay switching module, and the fault detection module is designed to judge the fault of power supply signal points according to the fault information fed back by the power supply signal detection module. In addition, the voltage amplitude attribute of a single terminal strip plug hole in the air break switching state can be used to judge whether the terminal strip plug hole has a cross-phase fault, and the cross-phase fault type (alternating current and alternating current, alternating current and direct current, and direct current and direct current) is given, so that the time for troubleshooting of test personnel is shortened, and the work efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of terminal block signal detection technology, specifically to a terminal block signal detector and its detection method. Background Technology

[0002] The secondary switchgear of a power system relay protection system contains multiple electrical circuits with different sources. After wiring, it is necessary to test whether there is any electrical connection between these circuits. In the traditional mode, two people work together: one person switches on the circuit breakers of each circuit, and the other uses a multimeter to measure the voltage characteristics of different source circuit points on the terminal block to determine if there is any cross-current. In this mode, every time a circuit breaker is switched on or off, all different source circuit points must be tested. The number of tests can reach more than 600 times in a 200kV substation, and even more times in substations above 500kV. This mode is prone to mistesting and omissions, leaving potential safety hazards.

[0003] Currently, power signal detection for terminal blocks relies solely on individual measurements using a multimeter, resulting in lengthy testing times and low efficiency. Furthermore, measuring power signals requires locating the measurement points against drawings and determining their power attribute (AC or DC). The multimeter must then be manually switched to the appropriate range, and the probes used to test each point individually. This repetitive process is highly susceptible to errors in range selection and measurement points, leading to inaccurate or missed readings and severely testing the operator's concentration. If these errors or omissions go undetected, they may only be discovered after the system is operational and a relay protection device malfunctions. Moreover, existing testing methods cannot provide qualitative assessments of terminal block power point faults, posing a significant safety hazard to the power system.

[0004] To achieve full-coverage automatic detection of terminal block power signals and fault diagnosis at power points, and to prevent false or missed measurements caused by multimeter single-point measurement and manual range switching that could pose safety hazards to power system operation, it is particularly important to design a detector that can automatically detect the voltage amplitude and voltage attributes of terminal block power signal points with a single wiring connection, while also qualitatively judging fault points.

[0005] In the prior art, such as CN217034115U, a signal transmission measurement device and terminal block signal detection system are disclosed. The measurement method using a multi-plug and a multimeter solves the technical problem of repeatedly plugging and unplugging plugs in point-by-point measurement. However, it still requires manual use of a multimeter to complete the measurement.

[0006] In the prior art, CN110895296A discloses a relay protection test conversion device and method, which uses multiple connection combinations of terminal blocks for measurement. This also reduces the number of plug insertions and removals, but cannot detect the status and the more complex power signal detection of the terminal blocks.

[0007] Existing technologies, such as CN210005668U, disclose a terminal connection relationship verification device and a power distribution terminal test device. By applying an electrical environment, they determine whether the connection relationship between the terminal under test and the first terminal block is a preset connection relationship. However, they still cannot detect the status and the more complex power signal detection of the terminal block.

[0008] Existing technology, such as CN102608480A, discloses an intelligent wiring connection and inspection system and method. This system uses an intelligent level signal transceiver inspection device to sequentially send level and coded signals, then connects or touches each terminal on the other end sequentially. Upon receiving the corresponding level and coded signals, an embedded microprocessor automatically compares the data with a pre-stored terminal block and code table to check and guide the connection to the corresponding terminals, thus determining the correctness of the connection. However, this system can only determine correctness based on a preset table and cannot further identify the type of fault, still requiring additional troubleshooting.

[0009] Existing technologies, such as CN111537918A, disclose a distributed wiring harness testing device and method that performs testing in a distributed manner. This involves first testing the connectivity of lines within test nodes, then testing the connectivity of lines between test nodes, and finally testing the parameters of functional components within the lines. While this method can determine the connectivity between test nodes, it still cannot determine the fault type between the test nodes.

[0010] In the prior art, such as CN114264980A, a test method and system for checking the internal wire connection relationship of the device under test is disclosed. The test system is constructed in a modular way, with modular design and wireless networking design to check the wire connection relationship, but it cannot check the fault information on the terminal block with effective connection.

[0011] In the prior art, such as the one disclosed in CN104007396A, there is a device and method for finding loop current leakage faults in a DC system. However, the current leakage judgment method involved can only judge current leakage faults in dual DC power supplies and cannot judge the current leakage faults in systems that may contain AC current leakage.

[0012] In the prior art, CN105510773A discloses a DC system grounding fault detection device that uses the principle of capacitive voltage division to detect AC and DC crosstalk, but it can only judge AC and DC crosstalk.

[0013] In the prior art, CN108072849A discloses an insulation reduction fault finding system that uses the comparison between the detection value and the AC setting value to determine whether there is a cross-current fault, but it can only detect AC cross-current. Summary of the Invention

[0014] (a) Technical problems to be solved

[0015] To address the shortcomings of existing technologies, this invention provides a terminal block signal detector and its detection method, solving the following technical problems:

[0016] 1. In the existing technology, the terminal blocks of the secondary panel cabinet for relay protection in the power system have many circuits and a large number of power signals, making the testing work cumbersome and complicated.

[0017] 2. Existing terminal signal and terminal connection status detection methods cannot directly determine the type of fault in the terminal block of the secondary cabinet of the power system relay protection.

[0018] 3. Existing cross-current detection technologies cannot simultaneously detect AC-AC, DC-AC, and DC-DC situations.

[0019] (II) Technical Solution

[0020] To achieve the above objectives, the present invention is implemented through the following technical solution: a terminal block signal detector, comprising a control module and a terminal block plug module, wherein the terminal block plug module is used to connect multiple terminal block sockets, characterized in that: the detection circuit further comprises a power signal detection module and a fault detection module;

[0021] The terminal block plug module is electrically connected to the power signal detection module, and the terminal block plug module is used to electrically connect the terminal block socket and the power signal detection module;

[0022] The power signal detection module is used to detect the voltage amplitude and voltage properties of the terminal block sockets;

[0023] The power signal detection module is electrically connected to the fault detection module. The fault detection module is used to output DC voltage and calculate the resistance value of the electrical equipment connected to the terminal block socket.

[0024] If the amplitude of the power signal detection terminal block is not 0, the control module will directly display the data and status of that terminal block.

[0025] If the power signal detection module detects that the voltage amplitude of the terminal block socket is 0 and the resistance of the terminal block socket is infinite, it will send the "open circuit fault" signal to the display screen through the control module.

[0026] If the power signal detection module detects that the amplitude of the terminal block socket is 0 and the resistance value of the terminal block socket is not infinite, it will send the "short circuit fault" signal to the display screen through the control module to indicate an open circuit fault.

[0027] Preferably, the system includes a relay switching module and a relay driving circuit. The control module is connected to the relay switching module via the relay driving circuit. The relay switching module is electrically connected to the terminal block plug module and the control module, respectively. The relay driving circuit is used to control the on / off state of the terminal block plug and to receive high and low level signals from the control module to drive the relays in the relay switching module to switch the detection channel.

[0028] Preferably, it includes a power supply module, which provides power to the control module, the power signal detection module, and the fault detection module.

[0029] Preferably, it includes a display screen, which is electrically connected to the control module.

[0030] Preferably, the device includes a pressure detection module, an electromagnet, and a detector housing. The detector housing can be attracted to a magnetic object by the electromagnet. The pressure detection module is used to detect the pressure between the detector housing and the magnetic object. Both the pressure detection module and the electromagnet are electrically connected to the control module.

[0031] A detection method for a terminal block signal detector includes the following steps:

[0032] Step 1: Connect the terminal block plug module to the terminal block socket to be tested, and set the number of measurement channels X;

[0033] Step 2: Set the switch status of the terminal block to be tested;

[0034] Step 3: The controller module connects the terminal block sockets sequentially by controlling the relays, connecting only one terminal block socket at a time;

[0035] Step 4: The power signal detection module calculates the voltage amplitude and voltage attribute of the terminal block. If the voltage amplitude is 0, proceed to step 6; if the voltage amplitude is not 0, proceed to step 5.

[0036] Step 5: After the control module displays the signal data and status of terminal block socket n, it determines whether n is equal to X. If it is equal to X, proceed to step 9; otherwise, n = n + 1 and return to step 3.

[0037] Step Six: The fault detection module outputs a DC voltage and calculates the resistance value of the terminal block socket. If the resistance value is infinite, proceed to Step Seven; if the resistance value is not infinite, proceed to Step Eight.

[0038] Step 7: The "open circuit fault" signal is displayed on the screen via the control module;

[0039] Step 8: The "short circuit fault" signal is displayed on the screen via the control module;

[0040] Step 9: End the test.

[0041] A detection method for a terminal block signal detector with crosstalk detection includes the following steps:

[0042] Step 1: Connect the terminal block plug module to the terminal block socket to be tested, and set the number of measurement channels to X and the number of circuit breakers to be opened and closed to Y;

[0043] Step 2: Set the number of cyclic tests y = 1, terminal hole number n = 1, number of times the terminal hole amplitude is 0 m = 0, and number of times the terminal hole amplitude is not 0 z = 0;

[0044] Step 3: Close the y-th circuit breaker, open the remaining circuit breakers, the controller module drives the relay Kn to activate and close, open the remaining relays, and connect the terminal block sockets in sequence, connecting only one terminal block socket at a time;

[0045] Step 4: The power signal detection module calculates the voltage amplitude and voltage attribute of the terminal block socket. If the voltage amplitude is 0, proceed to step 5; if the voltage amplitude is not 0, proceed to step 11.

[0046] Step 5: The number of times the terminal hole amplitude is 0 is m = m + 1;

[0047] Step Six: Determine if m is equal to the number of circuit breakers that need to be closed (Y). If yes, proceed to Step Seven; otherwise, proceed to Step Ten.

[0048] Step 7: The fault detection module outputs a DC voltage and calculates the resistance value of the terminal block socket. If the resistance value is infinite, proceed to step 8; if the resistance value is not infinite, proceed to step 9.

[0049] Step 8: The control module displays the "open circuit fault" signal on the screen and proceeds to step 18 to complete the detection process;

[0050] Step Nine: The control module displays the "short circuit fault" signal on the screen and proceeds to Step Eighteen to complete the detection process;

[0051] Step 10: The control module displays the "voltage is 0" signal on the screen and proceeds to Step 14;

[0052] Step 11: The number of times the amplitude of the terminal hole is not zero is z = z + 1;

[0053] Step 12: Determine if z is greater than 1. If yes, proceed to step 13; otherwise, proceed to step 14.

[0054] Step 13: The control module displays the "current leakage exists in the nth terminal block socket" signal on the display screen and proceeds to Step 14;

[0055] Step Fourteen: Determine whether the terminal hole number n is equal to the number of channels X to be measured. If yes, proceed to Step Fifteen; otherwise, proceed to Step Sixteen.

[0056] Step 15: Determine if the number of loop tests y is equal to the number of circuit breakers Y that need to be opened and closed. If yes, proceed to step 18; otherwise, proceed to step 17.

[0057] Step 16: Terminal hole number n = n + 1, return to step 3;

[0058] Step 17: Repeat the test y = y + 1, terminal hole number n = 1, then return to step 8;

[0059] Step 18: Testing completed.

[0060] Preferably, the following step is added before step one:

[0061] Attach the detector housing to the terminal box cabinet door;

[0062] S1: The minimum suction force G is set within the device system based on the instrument's own weight;

[0063] S2: The user selects whether the device is attached to the terminal box cabinet door according to the site conditions. If yes, proceed to S3; otherwise, proceed to S6.

[0064] S3: Pressure detection module measures adsorption force P;

[0065] S4: The microcontroller main control unit determines whether the adsorption force P is greater than or equal to the minimum adsorption force G set by the system. If so, proceed to S6; otherwise, proceed to S5.

[0066] S5: The microcontroller main control unit activates the electromagnetic adsorption function, controls the electromagnet to increase the adsorption force P, and then returns to S3.

[0067] S6: End.

[0068] (III) Beneficial Effects

[0069] This invention provides a terminal block signal detector and its detection method. It has the following beneficial effects:

[0070] (1) The terminal block signal detector and its detection method realize the detection of AC power, positive DC power and negative DC power without switching through the designed power signal detection module. At the same time, the designed relay switching module realizes the full coverage measurement of multiple power signals. The designed fault detection module judges the fault of the power signal point according to the fault information fed back by the power signal detection module. It effectively solves the problems of easy misdetection and missed detection, inability to judge fault and low efficiency of the existing detection method. At the same time, for the terminal hole of the terminal block is small and has a certain depth, the corresponding acquisition connector is equipped to realize the reliable fixation and accurate connection of the acquisition connector. Furthermore, the electromagnetic and permanent magnet adaptive adsorption module is designed to realize the full coverage automatic detection and fault identification of the terminal block power signal, thereby achieving the purpose of improving quality and efficiency.

[0071] (2) The terminal block signal detector and its detection method can determine whether there is a cross-current fault in the terminal block by statistically analyzing the voltage amplitude attribute of a single terminal block socket when the circuit breaker is open or closed, and give the cross-current fault type (AC to AC, AC to DC, DC to DC), shorten the time for testers to troubleshoot and improve work efficiency. Attached Figure Description

[0072] Figure 1 This is a schematic diagram of the detection circuit of the present invention;

[0073] Figure 2 This is a schematic diagram of the detection circuit of the present invention (with a relay switching module);

[0074] Figure 3 This is a schematic diagram of one embodiment of the detection circuit of the present invention;

[0075] Figure 4 This is a schematic diagram of the relay switching module circuit;

[0076] Figure 5 This is a circuit diagram of the power signal detection module;

[0077] Figure 6 This is a circuit diagram of the fault detection module;

[0078] Figure 7 This is the flow chart of the detection method with electromagnetic adsorption feedback of the present invention;

[0079] Figure 8 The following is the flowchart of the fault detection method of the present invention;

[0080] Figure 9 This is the flowchart of the electromagnetic adsorption feedback method of the present invention;

[0081] Figure 10 This is the method flow of the present invention, which includes cross-current detection and electromagnetic adsorption feedback;

[0082] Figure 11 The process combines fault and cross-current detection. Detailed Implementation

[0083] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0084] Example 1:

[0085] A terminal block signal detector includes a control module and a terminal block plug module. The terminal block plug module is used to connect multiple terminal block sockets. The detection circuit also includes a power signal detection module and a fault detection module.

[0086] The terminal block plug module is electrically connected to the power signal detection module, and the terminal block plug module is used to electrically connect the terminal block socket and the power signal detection module;

[0087] The power signal detection module is used to detect the voltage amplitude and voltage properties of the terminal block sockets;

[0088] The power signal detection module is electrically connected to the fault detection module. The fault detection module is used to output DC voltage and calculate the resistance value of the terminal block socket.

[0089] If the amplitude of the power signal detection terminal block is not 0, the control module controls the display screen to show the data and status of the terminal block.

[0090] If the power signal detection module detects that the voltage amplitude of the terminal block socket is 0 and the resistance of the terminal block socket is infinite, it will send the "open circuit fault" signal to the display screen through the control module.

[0091] If the power signal detection module detects that the amplitude of the terminal block socket is 0 and the resistance of the terminal block socket is not infinite, it will send the "short circuit fault" signal to the display screen through the control module to indicate an open circuit fault.

[0092] in:

[0093] It includes a power module and a display screen. The power module provides power to the control module, the power signal detection module, and the fault detection module. The display screen is electrically connected to the control module.

[0094] To enable sequential connection of the terminal blocks, a relay switching module and a relay driving circuit are also included. The control module is connected to the relay switching module via the relay driving circuit. The relay switching module is electrically connected to both the terminal block plug module and the control module. The relay driving circuit controls the on / off state of the terminal block plug. The relay driving circuit receives high and low voltage levels from the control module and drives the relays in the relay switching module to switch the detection channels.

[0095] To facilitate the placement of the device incorporating the circuitry of this invention, a pressure detection module, an electromagnet, and a detector housing are included. The detector housing can be attached to a magnetic object by means of the electromagnet. The pressure detection module is used to detect the pressure between the detector housing and the magnetic object. Both the pressure detection module and the electromagnet are electrically connected to the control module.

[0096] In order to enable the circuit system of the present invention to measure both AC and DC simultaneously, all groundings in the device are not interconnected.

[0097] To prevent personnel from accidentally inserting the terminal block plug module into the high-voltage socket, the relay in this invention is recommended to be a high-voltage relay.

[0098] like Figure 5 The present invention provides a power signal detection module circuit, which includes VCC1, VDD1, VCC3, VDD3, GND1, GND3, and GND4.

[0099] The first bridge circuit consists of D1, R1, R2, R3, R4, R5, R6, R7, R8, and R9.

[0100] Second diode D2, third diode D3, fourth diode D4;

[0101] Capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6, capacitor C7, capacitor C8, capacitor C9, capacitor C10, capacitor C11, capacitor C12, capacitor C13

[0102] First integrated operational amplifier U1, second integrated operational amplifier U2, fifth integrated operational amplifier U5;

[0103] First optocoupler U3, second optocoupler U4;

[0104] Port 1 of the first bridge circuit D1 is electrically connected to the terminal block plug module. Port 2 of the first bridge circuit D1 is connected to one end of the fourth resistor R4. Port 3 of the first bridge circuit D1 is connected to GND1. A first resistor R1, a second resistor R2, a second diode D2, and a third diode D3 are connected in parallel between port 1 and port 3 of the first bridge circuit D1. A third resistor R3 is connected in series between port 1 of the first bridge circuit D1 and the second resistor R2. The second diode D2 and the third diode D3 are in opposite directions.

[0105] The other end of the fourth resistor R4 is connected to one end of the fifth resistor R5. The other end of the fifth resistor R5 is connected to GND3. A fourth diode D4 and a first capacitor C1 are connected in parallel between the fifth resistor R5 and GND3. The other end of the fourth resistor R4 is connected to the sixth resistor R6. The other end of the sixth resistor R6 is connected to the positive terminal of the fifth integrated operational amplifier U5. The negative terminal of the fifth integrated operational amplifier U5 is connected to the seventh resistor R7 and the eighth resistor R8. The other end of the eighth resistor R8 is connected to GND3. The other end of the seventh resistor R7 is connected to port3. The upper end of the fifth integrated operational amplifier U5 is connected to VCC3 and the lower end is connected to VDD3. A tenth capacitor C10 and an eleventh capacitor C11 are connected in parallel between the upper end of the fifth integrated operational amplifier U5 and GND3. A twelfth capacitor C12 and a thirteenth capacitor C13 are connected in parallel between the lower end of the fifth integrated operational amplifier U5 and GND3. The output terminal of the fifth integrated operational amplifier U5 is connected to port3.

[0106] One end of the third resistor R3 is connected to the negative terminal of the first integrated operational amplifier U1 and the positive terminal of the second integrated operational amplifier U2. The positive terminal of the first integrated operational amplifier U1 is connected to the negative terminal of the second integrated operational amplifier U2. Both the positive terminal of the first integrated operational amplifier U1 and the negative terminal of the second integrated operational amplifier U2 are connected to GND3. The upper end of the first integrated operational amplifier U1 is connected to VCC1 and the lower end is connected to VDD1. A second capacitor C2 and a third capacitor C3 are connected in parallel between the upper end of the first integrated operational amplifier U1 and GND4. A fourth capacitor C4 and a fifth capacitor C5 are connected in parallel between the lower end of the first integrated operational amplifier U1 and GND4. The upper end of the second integrated operational amplifier U2 is connected to VCC1 and the lower end is connected to VDD1. A sixth capacitor C6 and a seventh capacitor C7 are connected in parallel between the upper end of the second integrated operational amplifier U2 and GND4. An eighth capacitor C8 and a ninth capacitor C9 are connected in parallel between the lower end of the second integrated operational amplifier U2 and GND4.

[0107] The output terminal of the first integrated operational amplifier U1 is connected to port 2 of the first optocoupler U3, the output terminal of the second integrated operational amplifier U2 is connected to port 2 of the second optocoupler U4, one end of the ninth resistor R9 is connected to port 1 of the first optocoupler U3 and port 1 of the second optocoupler U4 respectively, and the other end of the ninth resistor R9 is connected to VCC1. Port 3 of the first optocoupler U3 and port 3 of the second optocoupler U4 are both connected to GND3. Port 4 of the first optocoupler U3 is connected to port1, and port 4 of the second optocoupler U4 is connected to port2.

[0108] like Figure 6 The fault detection module circuit of the present invention includes VCC2, GND2, and VCC4;

[0109] The tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, and the thirteenth resistor R13;

[0110] Relay J1, fifth diode D5, sixth diode D6, seventh diode D7, first transistor Q1;

[0111] The terminal block plug module is connected to one end of the tenth resistor R10 and the eleventh resistor R11 respectively. The other end of the eleventh resistor R11 is connected to the moving contact Jd1 of relay J1, and the other end of the tenth resistor R10 is connected to the moving contact Jd2 of relay J1. The stationary contact NC1 of relay J1 is connected to VCC2, and the stationary contact NC2 of relay J1 is connected to GND2. The moving contact Jd2 of relay J1 corresponds to the stationary contact NO2 of relay J1, and the stationary contact NO1 of relay J1 corresponds to the moving contact Jd1 of relay J1. A fifth diode D5 is connected in parallel between the tenth resistor R10 and the eleventh resistor R11. The fifth diode D5 is connected in series with the sixth diode D6, and the fifth diode D5 and the sixth diode D6 are in opposite directions.

[0112] The coil of relay J1 is connected in parallel with the seventh diode D7. The anode of the seventh diode D7 is connected to the collector of the first transistor Q1. The emitter of the first transistor Q1 is connected to GND3. The base of the first transistor Q1 is connected to the twelfth resistor R12. A thirteenth resistor R13 is connected in parallel between the twelfth resistor R12 and the cathode of the seventh diode D7. The other ends of the twelfth resistor R12 and the thirteenth resistor R13 are connected to port 4.

[0113] Ports 1 through 4 are used to connect the microcontroller of the control module.

[0114] The power signal detection circuit separates the two characteristics (amplitude and attribute) of AC voltage, positive DC voltage, and negative DC voltage. When the voltage amplitude and attribute are uncertain, the voltage amplitude is directly calculated, and the attribute is judged within the measurement period. Finally, the control module recombines the amplitude and attribute within the period to obtain the measured voltage, that is, the AC voltage, positive DC voltage, or negative DC voltage with a clear voltage amplitude.

[0115] After the output from port 2 of the first bridge circuit D1, it passes through the voltage divider of the fourth resistor R4 and the fifth resistor R5, and then enters the fifth integrated operational amplifier U5 through the sixth resistor R6. The fourth diode D4 acts as a clamping device, and the maximum voltage cannot exceed the diode's forward voltage of 0.7V. The first capacitor C1 is a filter capacitor, which filters out the spike interference in the rectified DC power. The fifth integrated operational amplifier U5 amplifies the small voltage of no more than 0.7V and inputs it to the control module.

[0116] VCC1, VCC2, and VCC3 are +12V, while VDD1, VDD2, and VDD3 are -12V. The thirteenth capacitor, C13, is an electrolytic capacitor used for filtering. This part of the circuit rectifies the amplitude of AC, positive DC, and negative DC to obtain the amplitude data of the power signal points on the terminal block. The first resistor, R1, is a varistor connected to the power signal points and provides protection.

[0117] When the input voltage is too high, the varistor conducts, diverting the large current generated by the overvoltage to ground GND1, protecting the downstream circuits, equipment, and personnel safety. The second resistor R2 and the third resistor R3 take the signal before the first bridge circuit D1. The second diode D2 and the third diode D3 act as clamps. To achieve the purpose of one circuit measuring power supplies of different properties and to prevent short circuits in the rectifier bridge, GND1, GND2, and GND3 need to be mutually isolated. Simultaneously, the device internally has multiple power supply circuits; therefore, VCC1, VCC2, and VCC3 are mutually isolated, as are VDD1, VDD2, and VDD3. The second operational amplifier U2 is grounded to GND4 with its negative terminal (0), and the operational amplifier U1 is grounded to GND4 with its positive terminal (0).

[0118] When the first operational amplifier U1 and the second operational amplifier U2 are positive DC voltages, U2 outputs a high level while operational amplifier U1 outputs a low level. Therefore, the signals output to the control module from port1 and port2 are a regular 10101010 sequence.

[0119] When the inputs to the first operational amplifier U1 and the second operational amplifier U2 are negative DC voltages, the signals output to the control module from port1 and port2 are a regular 01010101 sequence.

[0120] When the input of the first operational amplifier U1 and the second operational amplifier U2 is AC voltage, the signals output from port1 and port2 to the control module will alternate between 10 / 01 / 10 / 01. One cycle of AC power is 50Hz, or 20ms. Before the controller sends the relay switching signal, and within a time of more than 20ms, it judges the output sequence of port1 and port2, and thus determines the power supply attribute (AC, DC positive, DC negative) of the terminal hole.

[0121] Port4 is normally at a low level. When a DC voltage needs to be output to detect a fault in the terminal hole, the control module sets port4 to a high level. Then, the first transistor Q1 is turned on, the relay J1 is activated, the moving contact Jd1 is connected to the stationary contact NC1, the moving contact Jd2 is connected to the stationary contact NC2, and VCC2 outputs a DC voltage to the terminal block and judges the fault based on the value of the feedback current.

[0122] like Figure 8 One of the detection methods in this embodiment (fault detection alone):

[0123] Step 1: Connect the terminal block plug module to the terminal block socket to be tested, and set the number of measurement channels X;

[0124] Step 2: Set the switch status of the terminal block to be tested;

[0125] Step 3: The controller module connects the terminal block sockets sequentially by controlling the relays, connecting only one terminal block socket at a time;

[0126] Step 4: The power signal detection module calculates the voltage amplitude and voltage attribute of the terminal block. If the voltage amplitude is 0, proceed to step 6; if the voltage amplitude is not 0, proceed to step 5.

[0127] Step 5: After the control module displays the signal data and status of terminal block socket n, it determines whether n is equal to X. If it is equal to X, proceed to step 9; otherwise, n = n + 1 and return to step 3.

[0128] Step Six: The fault detection module outputs a DC voltage and calculates the resistance value of the terminal block socket. If the resistance value is infinite, proceed to Step Seven; if the resistance value is not infinite, proceed to Step Eight.

[0129] Step 7: The "open circuit fault" signal is displayed on the screen via the control module;

[0130] Step 8: The "short circuit fault" signal is displayed on the screen via the control module;

[0131] Step 9: End the test.

[0132] like Figure 11The second detection method in this embodiment (combined detection of faults and cross-current):

[0133] Step 1: Connect the terminal block plug module to the terminal block socket to be tested, and set the number of measurement channels to X and the number of circuit breakers to be opened and closed to Y;

[0134] Step 2: Set the number of cyclic tests y = 1, terminal hole number n = 1, number of times the terminal hole amplitude is 0 m = 0, and number of times the terminal hole amplitude is not 0 z = 0;

[0135] Step 3: Close the y-th circuit breaker, open the remaining circuit breakers, the controller module drives the relay Kn to activate and close, open the remaining relays, and connect the terminal block sockets in sequence, connecting only one terminal block socket at a time;

[0136] Step 4: The power signal detection module calculates the voltage amplitude and voltage attribute of the terminal block socket. If the voltage amplitude is 0, proceed to step 5; if the voltage amplitude is not 0, proceed to step 11.

[0137] Step 5: The number of times the terminal hole amplitude is 0 is m = m + 1;

[0138] Step Six: Determine if m is equal to the number of circuit breakers that need to be closed (Y). If yes, proceed to Step Seven; otherwise, proceed to Step Ten.

[0139] Step 7: The fault detection module outputs a DC voltage and calculates the resistance value of the terminal block socket. If the resistance value is infinite, proceed to step 8; if the resistance value is not infinite, proceed to step 9.

[0140] Step 8: The control module displays the "open circuit fault" signal on the screen and proceeds to step 18 to complete the detection process;

[0141] Step Nine: The control module displays the "short circuit fault" signal on the screen and proceeds to Step Eighteen to complete the detection process;

[0142] Step 10: The control module displays the "voltage is 0" signal on the screen and proceeds to Step 14;

[0143] Step 11: The number of times the amplitude of the terminal hole is not zero is z = z + 1;

[0144] Step 12: Determine if z is greater than 1. If yes, proceed to step 13; otherwise, proceed to step 14.

[0145] Step 13: The control module displays the "current leakage exists in the nth terminal block socket" signal on the display screen and proceeds to Step 14;

[0146] Step Fourteen: Determine whether the terminal hole number n is equal to the number of channels X to be measured. If yes, proceed to Step Fifteen; otherwise, proceed to Step Sixteen.

[0147] Step 15: Determine if the number of loop tests y is equal to the number of circuit breakers Y that need to be opened and closed. If yes, proceed to step 18; otherwise, proceed to step 17.

[0148] Step 16: Terminal hole number n = n + 1, return to step 3;

[0149] Step 17: Repeat the test y = y + 1, terminal hole number n = 1, then return to step 8;

[0150] Step 18: Testing completed.

[0151] Example 2: To improve the adsorption stability of the detector housing on the terminal box cabinet door.

[0152] The difference from Example 1 is that the following step is added before step one:

[0153] The detector housing is attached to the terminal box cabinet door;

[0154] S1: The minimum suction force G is set within the device system based on the instrument's own weight;

[0155] S2: The user selects whether the device is attached to the terminal box cabinet door according to the site conditions. If yes, proceed to S3; otherwise, proceed to S6.

[0156] S3: Pressure detection module measures adsorption force P;

[0157] S4: The microcontroller main control unit determines whether the adsorption force P is greater than or equal to the minimum adsorption force G set by the system. If so, proceed to S6; otherwise, proceed to S5.

[0158] S5: The microcontroller main control unit activates the electromagnetic adsorption function, controls the electromagnet to increase the adsorption force P, and then returns to S3.

[0159] S6: End.

[0160] The detector's housing is attached to the terminal box cabinet door by a permanent magnet.

[0161] It should be noted that in the description of the invention, the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the description of the structure of the invention shown in the accompanying drawings. They are only for the convenience of describing the invention and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0162] The terms "first" and "second" in this technical solution are merely designations for corresponding structures that are identical or similar, or that perform similar functions. They do not represent an arrangement of the importance of these structures, nor do they imply any ranking, comparison of size, or other meaning.

[0163] Furthermore, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two structures. Those skilled in the art can understand the specific meaning of the above terms in this invention by considering the overall concept of the invention and the specific context of the solution.

Claims

1. A terminal block signal detector, comprising a control module and a terminal block plug module, wherein the terminal block plug module is used to connect multiple terminal block sockets, characterized in that: The detection circuit also includes a power signal detection module and a fault detection module; The terminal block plug module is electrically connected to the power signal detection module, and the terminal block plug module is used to electrically connect the terminal block socket and the power signal detection module; The power signal detection module is used to detect the voltage amplitude and voltage properties of the terminal block sockets; The power signal detection module is electrically connected to the fault detection module. The fault detection module is used to output DC voltage and calculate the resistance value of the terminal block socket. If the amplitude of the power signal detection terminal block is not 0, the control module controls the display screen to show the data and status of the terminal block. If the power signal detection module detects that the voltage amplitude of the terminal block socket is 0 and the resistance of the terminal block socket is infinite, it will send the "open circuit fault" signal to the display screen through the control module. If the power signal detection module detects that the amplitude of the terminal block socket is 0 and the resistance value of the terminal block socket is not infinite, it will send the "short circuit fault" signal to the display screen through the control module to display the open circuit fault.

2. The terminal block signal detector according to claim 1, characterized in that: The system includes a relay switching module and a relay driving circuit. The control module is connected to the relay switching module via the relay driving circuit. The relay switching module is electrically connected to the terminal block plug module and the control module, respectively. The relay driving circuit is used to control the on / off state of the terminal block plug and to receive high and low level signals from the control module to drive the relays in the relay switching module to switch detection channels.

3. The terminal block signal detector according to claim 1, characterized in that: It includes a power supply module, which provides power to the control module, the power signal detection module, and the fault detection module.

4. A terminal block signal detector according to claim 1, characterized in that: It includes a display screen, which is electrically connected to the control module.

5. A terminal block signal detector according to claim 1, characterized in that: The device includes a pressure detection module, an electromagnet, and a detector housing. The detector housing can be attracted to a magnetic object by the electromagnet. The pressure detection module is used to detect the pressure between the detector housing and the magnetic object. Both the pressure detection module and the electromagnet are electrically connected to a control module.

6. A detection method for a terminal block signal detector as described in claim 1, characterized in that: Includes the following steps: Step 1: Connect the terminal block plug module to the terminal block socket to be tested, and set the number of measurement channels X; Step 2: Set the switch status of the terminal block to be tested; Step 3: The controller module connects the terminal block sockets sequentially by controlling the relays, connecting only one terminal block socket at a time; Step 4: The power signal detection module calculates the voltage amplitude and voltage attribute of the terminal block. If the voltage amplitude is 0, proceed to step 6; if the voltage amplitude is not 0, proceed to step 5. Step 5: After the control module displays the signal data and status of terminal block socket n, it determines whether n is equal to X. If it is equal to X, proceed to step 9; otherwise, n = n + 1 and return to step 3. Step Six: The fault detection module outputs a DC voltage and calculates the resistance value of the terminal block socket. If the resistance value is infinite, proceed to Step Seven; if the resistance value is not infinite, proceed to Step Eight. Step 7: The "open circuit fault" signal is displayed on the screen via the control module; Step 8: The "short circuit fault" signal is displayed on the screen via the control module; Step 9: End the test.

7. The detection method of a terminal block signal detector according to claim 6, characterized in that: The device includes a pressure detection module, an electromagnet, and a detector housing. The detector housing can be attracted to a magnetic object by the electromagnet. The pressure detection module is used to detect the pressure between the detector housing and the magnetic object. Both the pressure detection module and the electromagnet are electrically connected to a control module.

8. The detection method of a terminal block signal detector according to claim 7, characterized in that: Add the following steps before step one: The detector housing is attached to the terminal box cabinet door; S1: The minimum suction force G is set within the device system based on the instrument's own weight; S2: The user selects whether the device is attached to the terminal box cabinet door according to the site conditions. If yes, proceed to S3; otherwise, proceed to S6. S3: Pressure detection module measures adsorption force P; S4: The microcontroller main control unit determines whether the adsorption force P is greater than or equal to the minimum adsorption force G set by the system. If so, proceed to S6; otherwise, proceed to S5. S5: The microcontroller main control unit activates the electromagnetic adsorption function, controls the electromagnet to increase the adsorption force P, and then returns to S3. S6: End.

9. The detection method of a terminal block signal detector according to claim 8, characterized in that: The outer casing of the detector is attached to the terminal box cabinet door by a permanent magnet.

10. A detection method for a terminal block signal detector as described in claim 1, characterized in that: Includes the following steps: Step 1: Connect the terminal block plug module to the terminal block socket to be tested, and set the number of measurement channels to X and the number of circuit breakers to be opened and closed to Y; Step 2: Set the number of cyclic tests y = 1, terminal hole number n = 1, number of times the terminal hole amplitude is 0 m = 0, and number of times the terminal hole amplitude is not 0 z = 0; Step 3: Close the y-th circuit breaker, open the remaining circuit breakers, the controller module drives the relay Kn to activate and close, open the remaining relays, and connect the terminal block sockets in sequence, connecting only one terminal block socket at a time; Step 4: The power signal detection module calculates the voltage amplitude and voltage attribute of the terminal block socket. If the voltage amplitude is 0, proceed to step 5; if the voltage amplitude is not 0, proceed to step 11. Step 5: The number of times the terminal hole amplitude is 0 is m = m + 1; Step Six: Determine if m is equal to the number of circuit breakers that need to be closed (Y). If yes, proceed to Step Seven; otherwise, proceed to Step Ten. Step 7: The fault detection module outputs a DC voltage and calculates the resistance value of the terminal block socket. If the resistance value is infinite, proceed to step 8; if the resistance value is not infinite, proceed to step 9. Step 8: The control module displays the "open circuit fault" signal on the screen and proceeds to step eighteen to complete the detection process; Step Nine: The control module displays the "short circuit fault" signal on the screen and proceeds to Step Eighteen to complete the detection process; Step 10: The control module displays the "voltage is 0" signal on the screen and proceeds to Step 14; Step 11: The number of times the amplitude of the terminal hole is not zero is z = z + 1; Step 12: Determine if z is greater than 1. If yes, proceed to step 13; otherwise, proceed to step 14. Step 13: The control module displays the "current leakage exists in the nth terminal block socket" signal on the display screen and proceeds to step 14; Step Fourteen: Determine whether the terminal hole number n is equal to the number of channels X to be measured. If yes, proceed to Step Fifteen; otherwise, proceed to Step Sixteen. Step 15: Determine if the number of loop tests y is equal to the number of circuit breakers Y that need to be opened and closed. If yes, proceed to step 18; otherwise, proceed to step 17. Step 16: Terminal hole number n = n + 1, return to step 3; Step 17: Repeat the test y = y + 1, terminal hole number n = 1, then return to step 8; Step 18: Testing completed.

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