Comprehensive test device and method for handcart switch

Abstract

The invention discloses a comprehensive test device and method for a handcart switch, and the device comprises a loop resistance measurement device which carries out the transformation measurement of the resistance of each aviation pin loop; the resistance sampling loop is connected to the loop resistance measuring device through a voltage dividing capacitor and a current sensor to obtain resistance data; the AD conversion module is connected to the current sensor of the resistance sampling loop and is used for receiving the analog signal; the DA conversion module is connected to a multi-path control switch at the front end of the loop resistance measuring device to output analog signals so as to formulate opening and closing control of a measuring loop; and the digital signal processor receives the digital signal input of the AD conversion module and outputs the processed digital control signal to the DA conversion module. According to the invention, by improving the connection medium and introducing the online identification unit, the stepping voltage measurement module, the programming logic and the storage analysis function, the efficiency and the accuracy of the handcart switch test are comprehensively improved.

Description

Technical Field

[0001] The invention relates to a comprehensive test device and method, and in particular to a comprehensive test device and method for a trolley switch. Background Art

[0002] As a key component in the power grid system, the circuit breaker plays a vital role in ensuring the stable operation of the power grid. Whether it is a planned power outage, equipment maintenance and update, or fault tripping, preventing the scope of the fault from further expanding, and ensuring the stable operation of the power grid, the circuit breaker plays a very important role. The trolley switch running in the switch cabinet is no exception. Due to the more hidden operating environment, defects are not easy to find. Failures may cause accidents such as fires and explosions and spread quickly. Therefore, the test results of the comprehensive test of the trolley switch are an extremely important indicator to measure whether the trolley switch can work healthily.

[0003] At present, there are two main types of comprehensive tests for trolley switches. One is the circuit resistance measurement test, which is used to check whether the opening and closing of the trolley switch and the secondary circuit of the energy storage are normal; the other is the switch action test, which tests whether the switch can operate correctly and whether the action time meets the requirements by applying pressure.

[0004] The circuit resistance measurement test is mainly used to check whether the opening and closing of the trolley switch and the secondary circuit of the energy storage are normal. The specific operation steps are as follows: pull the trolley switch to the maintenance position and remove the male aviation plug; determine the pin number corresponding to each circuit through the drawing; use the multimeter needle to contact the pins of the aviation plug one by one, read the corresponding resistance value, and record the corresponding resistance value of each circuit. The key to this test method is to accurately measure the resistance value of each circuit, so as to determine whether the secondary circuit is normal.

[0005] The switch action test is to test whether the switch can operate correctly and whether the action time meets the requirements by applying pressure. The specific operation steps are as follows: pull the trolley switch to the maintenance position and remove the public aviation plug; determine the pin number corresponding to each circuit through the drawing; clamp the crocodile clip on the pin corresponding to one of the circuits to be tested, and use a jumper to connect the crocodile clip to the output port of the power supply instrument; slowly step on the corresponding circuit and pressurize it. After multiple measurements, test whether the circuit can operate correctly and the voltage during operation, and manually record the corresponding opening and closing time, speed, synchronization, bounce, stroke, over-travel and other data during the operation; after recording, clamp the crocodile clip to the next circuit to be tested and perform the same test steps. This test method can test the action performance of the trolley switch and ensure its reliability and stability under actual working conditions.

[0006] Although the existing comprehensive test method for trolley switches can evaluate the performance of trolley switches to a certain extent, the following problems still exist in practical applications:

[0007] 1. The preparation work before the test is cumbersome;

[0008] Before conducting the test, it is necessary to determine the pins corresponding to each circuit by looking up the secondary circuit diagram, which is a time-consuming and error-prone process. This not only increases the burden on the test personnel, but also increases the error rate of the test.

[0009] 2. The operation is complicated and inefficient;

[0010] Due to the densely packed pins of aviation plugs, the secondary circuit is closed by using alligator clips and test leads during the test, which can easily lead to inaccurate measurement results due to accidental contact with other pins. In addition, the test process requires the collaboration of multiple people, one person to operate the test instrument, one person to fix the connection between the pins and the test instrument, and one person to monitor, which consumes a lot of manpower and reduces the test efficiency.

[0011] 3. The test results are less accurate;

[0012] Due to the limitations of the test instrument, such as the slow and imprecise knob voltage adjustment process, the accuracy of the test results is affected. This not only affects the evaluation of the trolley switch performance, but may also pose a potential threat to the stable operation of the power grid.

[0013] 4. Risk of electric shock;

[0014] Since the pressure instrument uses conductive alligator clips for voltage output, the pins corresponding to the next circuit must be replaced for measurement after completing a circuit test. The steps are cumbersome, and if the power supply of the pressure instrument is not cut off during the process of switching the tested pins, there may be a risk of low-voltage electric shock to the workers.

[0015] 5. Issues with data storage and analysis;

[0016] After each test, data needs to be recorded manually, which is inconvenient and not conducive to data storage and memory. In addition, it is impossible to analyze and predict the operating conditions of the equipment by analyzing the test data. Summary of the invention

[0017] In order to solve the deficiencies of the above-mentioned technology, the present invention provides a comprehensive test device and method for a trolley switch.

[0018] In order to solve the above technical problems, the technical solution adopted by the present invention is: a comprehensive test device for a trolley switch, characterized in that it includes:

[0019] Loop resistance measuring device, which performs voltage transformation measurement on the resistance of each aviation pin loop;

[0020] The resistance sampling loop is connected to the loop resistance measuring device through the voltage dividing capacitor and the current sensor to obtain the resistance data;

[0021] The AD conversion module is connected to the current sensor of the resistance sampling loop and receives the analog signal;

[0022] A DA conversion module, connected to the multi-way control switch at the front end of the loop resistance measuring device, outputs an analog signal to formulate the separation and connection control of the measuring loop;

[0023] The digital signal processor receives the digital signal input from the AD conversion module and outputs the processed digital control signal to the DA conversion module.

[0024] Furthermore, the resistance sampling circuit includes:

[0025] 57V power supply;

[0026] On / off inching switch for manual control of circuits;

[0027] To prevent the thermal protection switch from cutting off the internal conduction circuit in time when a circuit overload occurs;

[0028] Several voltage-dividing capacitors that evenly distribute the power supply voltage to each pin;

[0029] Several current sensors for extracting current test loops.

[0030] Furthermore, a 57V power supply, a momentary switch, a thermal protection switch and several voltage-dividing capacitors are connected in series in sequence to form an internal conduction loop. Both ends of each voltage-dividing capacitor are connected to a pin of a loop resistance measuring device to form several current test loops. Each current sensor is connected to a current test loop to measure the current of the current test loop when it is turned on. Each current sensor is connected to an AD conversion module.

[0031] Furthermore, the aviation pin loop of the loop resistance measuring device includes:

[0032] 220V power supply;

[0033] A point-actuated contact switch connects or disconnects the connection between the power supply and the sliding rheostat;

[0034] Sliding rheostat, by changing the resistance value of the sliding rheostat, the voltage in each aviation pin circuit can be adjusted;

[0035] The multi-channel conversion controllable switch is used to select different output paths and output the regulated voltage to the pins of the aviation pin circuit to be tested.

[0036] Furthermore, one end of the series connection of the 220V power supply and the momentary contact switch is connected to the fixed contacts of the multi-way conversion controllable switch and the sliding rheostat, and the other end is connected to the moving contact of the sliding rheostat, and an aviation pin is led out from the moving contact of the multi-way conversion controllable switch and the sliding rheostat.

[0037] Furthermore, the multi-channel conversion controllable switch controls the aviation pin to be connected to the DA conversion module, and the moving contact of the sliding rheostat is connected to the DA conversion module.

[0038] Furthermore, the aviation pins of the loop resistance measuring device adopt aircraft carrier pins, and are assembled into an aircraft carrier pin embedded panel equivalent to all the female pins inside the switch cabinet.

[0039] Furthermore, it also includes a memory for importing aging curves of the coil and the opening and closing springs, and the memory is connected to the digital signal processor.

[0040] A working method of a comprehensive test device for a trolley switch, including the comprehensive test device for the trolley switch, the working method comprising:

[0041] S1, initialization, start the test device, initialize all modules and system parameters;

[0042] S2, connect the test equipment, insert the aviation male pin into the aviation female pin, and ensure a good connection;

[0043] S3, apply voltage, apply equal differential voltage to the aircraft carrier pin, and this voltage will gradually change according to the preset rule;

[0044] S4, measure current, measure the current in the loop through the current sensor, and the sensor outputs an analog signal;

[0045] S5, analog-to-digital conversion, inputting the analog signal of the current sensor into the AD conversion module and converting it into a digital signal;

[0046] S6, digital signal processing, the digital signal processor receives the digital signal converted by the AD conversion module, performs online loop monitoring, and memorizes and records the resistance value of each loop in the open state;

[0047] S7, loop control, according to the recorded specific resistance value, the digital signal processor outputs the control signal to the DA conversion module, and the DA conversion module converts the digital signal into an analog control signal;

[0048] S8, switching the switch state, transmitting the analog control signal converted by the DA conversion module to the multi-way control switch, energizing the control circuit, switching the switch state, and when the switch state is switched to the open position, repeating steps S4 to S7, and measuring the resistance value again;

[0049] S9, through the loop resistance corresponding to the opening and closing state, the imported functional loop is traversed according to the loop resistance lookup table, to achieve online parameter identification, and find out the opening, closing and storage functional loops corresponding to each pin;

[0050] S10, automatic test of action voltage, step-by-step measurement of action voltage, converting step signals into continuous signals, automatically increasing voltage, and accurately detecting the action voltage of the switch;

[0051] S11, data recording, recording the action voltage and the resistance value of the aviation pin circuit into the memory;

[0052] S12, curve fitting, uses the recorded data to predict the aging curve through curve fitting to facilitate the analysis of the service life of the equipment;

[0053] S13, end the test. After completing all test steps, close the test device, export the test, and conduct subsequent analysis.

[0054] The present invention discloses a comprehensive test device and method for a trolley switch, which has the following advantages:

[0055] The problem that the traditional alligator clip and the multimeter needle cannot fit tightly with the male pin of the aviation plug, resulting in inaccurate measurement results, is solved. By adopting a female pin model that fully matches the male pin and fixing it on the test instrument, the secondary circuit is led out from the female pin jack, accurate measurement is achieved, manual fixation is avoided, and the accuracy of the test results is improved.

[0056] The wiring process of the comprehensive test is simplified. By using DSP, AD conversion module / DA conversion module and self-designed resistance sampling circuit, the circuit current is collected by applying equal differential voltage, the circuit resistance is automatically determined and the circuit is searched, which replaces the reference drawings and manual wiring, greatly reducing the difficulty of operation and time cost.

[0057] The accuracy of measuring the action voltage by manually adjusting the knob is overcome. By adding a voltage output module composed of an electrical circuit and a control circuit, the automatic step output voltage and the automatic measurement of the trolley switch action voltage are realized, which improves the test efficiency and accuracy.

[0058] The problem of cumbersome test wiring and frequent instrument replacement is solved. By introducing test logic and programming modules, an integrated comprehensive test instrument is formed, and the stepping flat wave output voltage is adopted to realize simple one-button test operation.

[0059] The problem of difficulty in recording, storing and analyzing test results has been solved. The device has an integrated storage system that can store and memorize test results and compare them with the aging curve entered by the system. The aging trend of coils and springs can be predicted through curve fitting, and the remaining service life can be evaluated, which enhances the predictability and effectiveness of equipment maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 It is the electrical principle diagram of the online identification unit of the present invention.

[0061] Figure 2 The electrical schematic diagram of the loop resistance measurement device.

[0062] Figure 3 This is an example diagram of the separation of the male pin and the female pin of the present invention.

[0063] Figure 4 This is an example diagram of the combination of the male pin and the female pin of the present invention.

[0064] Figure 5 This is an example diagram of the position of the aircraft carrier pin embedded panel of the present invention.

[0065] Figure 6 It is a schematic diagram of the workflow of the present invention. DETAILED DESCRIPTION

[0066] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0067] The present invention discloses a comprehensive test device for a trolley switch. As an online identification unit, the invention aims to solve the problem that the pins corresponding to the control circuits of different trolley switches are in different positions, and the secondary drawings need to be checked before each test to determine the pins corresponding to each control circuit, and the line selection cannot be automatically performed; the problem that the pressure clamp or the multimeter probe may touch the trolley switch by mistake due to the dense pins, and the problem that the action voltage range needs to be determined only after the voltage is slowly increased and multiple measurements are taken during the action voltage test; the comprehensive test consists of multiple steps, and multiple circuits need to be measured. After a single test is completed, the joint position needs to be changed, which is cumbersome and there is a risk of low-voltage electric shock; and the problem that data needs to be recorded manually after the test, which is inconvenient.

[0068] Specifically, the online identification unit includes a loop resistance measuring device, a resistance sampling loop, an AD conversion module, a digital signal processor, a DA conversion module and a memory;

[0069] like Figure 1 and Figure 2 As shown, the digital signal processor DSP receives the digital signal input from the AD conversion module and outputs the processed digital control signal to the DA conversion module.

[0070] The loop resistance measuring device is responsible for measuring the resistance of each aviation pin loop by voltage transformation; the aviation pin loop of the loop resistance measuring device includes:

[0071] 220V power supply G2;

[0072] The inching contact switch S2 connects or disconnects the connection between the power supply and the sliding rheostat;

[0073] Sliding rheostat R1, adjusts the voltage in each aviation pin circuit by changing the resistance value of the sliding rheostat;

[0074] The multi-channel conversion controllable switch is used to select different output paths and output the regulated voltage to the pins of the aviation pin circuit to be tested.

[0075] In terms of circuit connection, one end of the series connection of the 220V power supply G2 and the inching contact switch S2 is connected to the fixed contact of the multi-way conversion controllable switch and the sliding rheostat, and the other end is connected to the moving contact of the sliding rheostat. The aviation pin is led out from the moving contact of the multi-way conversion controllable switch and the sliding rheostat. The multi-way conversion controllable switch controls the aviation pin to connect to the DA conversion module, and the moving contact of the sliding rheostat is connected to the DA conversion module. Through the inching contact switch, the 220V power supply is divided on the sliding rheostat, and finally the voltage is output to the aviation pin of the circuit to be tested through the multi-way conversion switch. The digital signal processor DSP and the DA conversion module form a digital control circuit. The digital signal processor DSP outputs the opening or closing circuit that needs to be pressurized with a digital signal. The DA conversion module processes the digital signal and converts it into an electrical signal, controls the multi-way conversion switch to make the corresponding circuit conductive, and adjusts the pointer position of the sliding rheostat so that its voltage starts from 66V and gradually increases to 143V. The cyclic test starts from the open position. After the switch is closed, the action signal is transmitted from the AD conversion module to the digital signal processor DSP. After the digital signal processor DSP records the action voltage data, it issues a pressurization command for the opening circuit to the DA conversion module. At this time, the sliding rheostat position is restored and immediately starts to slide from the initial position, gradually increasing the output voltage, and cyclically performing the step-up process from 66V to 143V until the switch is actuated and the opening is completed. After the action signal and action voltage data are transmitted to the DSP, the entire action voltage measurement process is completed.

[0076] In particular, the aviation pins of the loop resistance measuring device adopt aircraft carrier pins, such as Figure 5 As shown, it is assembled into an aircraft carrier pin embedded panel that is equivalent to all the female pins inside the switch cabinet. The present invention solves the problem that the alligator clip and the multimeter needle cannot fit tightly with the aviation male pin, the measurement result is inaccurate, and manual fixation is required. For the first time, a female pin model that fully matches the male pin is used to fix it on the test instrument. At the same time, the corresponding secondary circuit is led out from the aircraft carrier pin jack, replacing the alligator clip and the ohmmeter pin. The tight fit makes the test result accurate, solving this problem. Figure 3 and Figure 4 Shown are examples of male and female pins being separated and joined.

[0077] The above resistance sampling loop is connected to the loop resistance measuring device through the voltage dividing capacitor and the current sensor to obtain resistance data; the resistance sampling loop includes:

[0078] 57V power supply G1, 58V power supply is used because this voltage is lower than the action voltage of the partial closing circuit in the switch, which will not cause false operation;

[0079] On / off switch SB1 for manual control of circuit;

[0080] To prevent the circuit from overloading and causing a fault, the thermal protection switch S1 of the internal conducting circuit is cut off in time;

[0081] A plurality of voltage-dividing capacitors C that evenly distribute the power supply voltage on each pin; the voltage-dividing capacitors evenly distribute the 57V power supply voltage on each pin;

[0082] Several current sensors A are used to extract the current test loop. The current sensor is used to extract the current of the conductive loop, and obtain the voltage difference added to the loop through the corresponding pin number, and calculate the resistance of this loop using Ohm's law.

[0083] In terms of circuit connection, the 57V power supply G1, the momentary switch SB1, the thermal protection switch S1 and several voltage-dividing capacitors C are connected in series in sequence to form an internal conduction loop. Both ends of each voltage-dividing capacitor C are connected to a pin of a loop resistance measuring device to form several current test loops. Each current sensor is connected to a current test loop to measure the current of the current test loop when it is turned on. The AD conversion module is connected to the current sensor of the resistance sampling loop to receive the analog signal and input it into the digital signal processor.

[0084] The obtained sampling data is input into the AD conversion module, the electrical analog quantity is converted into a digital quantity, and the data is output to the digital signal processor DSP through the AD conversion module. At the same time, the coil and the opening and closing spring aging curve are imported into the memory and connected to the digital signal processor. The digital signal processor DSP analyzes, stores and memorizes the data, and can store the digital data of the resistance of the aviation pin circuit, and at the same time sends an action signal to the circuit of the corresponding resistance value, which is input to the DA conversion module in the form of a digital control quantity. The DA conversion module is connected to the multi-way control switch at the front end of the loop resistance measuring device to output an analog signal to formulate the opening and closing control of the measurement circuit; that is, the DA conversion module receives the digital signal sent by the digital signal processor DSP, converts it into an electrical signal, acts on the multi-way control switch S2, realizes the opening and closing control of the specified circuit, and applies a voltage of 220V to the circuit that needs to be acted through the power supply G2, so as to realize the opening and closing of the trolley switch and the switching of the energy storage state. This process is repeated, and the corresponding data processed by the digital signal processor DSP is compared with the above-mentioned imported curve to complete the identification of the corresponding circuit and pin composition.

[0085] Add memory to traditional test instruments to realize self-storage and self-analysis of test results. Add memory to traditional test instruments, import coil and opening and closing spring aging curves into the memory, and record test data at the same time. When the measurement is completed, the digital signal processor DSP can be controlled to retrieve historical test information and compare it with the current test action voltage, loop resistance, mechanical characteristics data and historical data. Combined with the imported aging curve, analog fitting of the aging curve is performed in DSP. Form relevant fitting curves (action speed and action voltage curves), and import the standard data curve with the ordinate as the test index data. The intersection of the test standard data curve and the fitting curve is calculated by calculation, and the intersection is the aging scrap time of the equipment. At the same time, according to the predicted aging curve, the digital signal processor DSP will automatically deduce the best time for the next test and the test indicators that need to be paid attention to. By importing the aging curve and introducing the curve fitting function, data transmission, storage, and analysis are realized, and the equipment and data are matched, which can provide aging trend prediction of equipment such as coils and springs, which is conducive to the controllable, controllable and online control of the trolley switch.

[0086] At the same time, the present invention realizes the process of step-by-step voltage increase, automatic output, automatic switch action and data recording through this self-developed circuit and control principle, replacing the traditional experimental process of adjusting voltage with a knob and manual output, and achieving the function of self-testing the action voltage. The test logic is introduced into the digital signal processor DSP, and the normal test process is imported. First, the switch state is checked, the opening and closing of the switch and the resistance of the energy storage circuit are tested, and then the switch of the hand car is pressurized to test its action voltage and mechanical characteristics. Programming is performed using judgment logic such as if and else, so that one-key measurement of mechanical characteristics, action voltage, loop resistance and other functions can be achieved according to the switch state and the established operation process.

[0087] In order to solve the problem that each comprehensive test requires consulting the secondary drawings, determining the circuit where the pin is located, and then conducting the test wiring, which is cumbersome, time-consuming and labor-intensive, DSP, AD conversion module, DA conversion module, and resistance sampling circuit are introduced. By applying a small differential voltage to the pin, the circuit current is collected, the circuit resistance is determined, and the online identification method is used to search and traverse the circuit, and then the separation, combination and storage circuits are found by comparing with the imported lookup table, and the pins corresponding to each circuit are determined to realize the automatic line selection function.

[0088] In order to solve the problem of manual adjustment of the knob when measuring the action voltage, inaccurate adjustment voltage, and inching output, a voltage output module composed of an electrical circuit and a control circuit is added to realize the function of automatic step output voltage and automatic measurement of the action voltage of the trolley switch, thus solving this problem. In order to solve the problem of cumbersome test wiring and frequent instrument replacement, the test logic is introduced, and the test sequence is standardized through the programming module to form an integrated comprehensive test instrument. At the same time, the output voltage is output by stepping flat wave, which can realize one-button test.

[0089] In order to solve the problem that the test results after the equipment test are difficult to record, store and analyze, a storage system is added inside the device, which can store and memorize the test results, and can compare them with the coil and spring aging curves entered by the system, and fit the test data according to the curve form, so as to predict the aging trend of coils and springs and evaluate the remaining service life.

[0090] At the same time, the present invention discloses a working method of a comprehensive test device for a trolley switch, including the comprehensive test device for the trolley switch, and the working method includes:

[0091] S1, initialization, start the test device, initialize all modules and system parameters;

[0092] S2, connect the test equipment, insert the aviation male pin into the aviation female pin, and ensure a good connection;

[0093] S3, apply voltage, apply equal differential voltage to the aircraft carrier pin, and this voltage will gradually change according to the preset rule;

[0094] S4, measure current, measure the current in the loop through the current sensor, and the sensor outputs an analog signal;

[0095] S5, analog-to-digital conversion, inputting the analog signal of the current sensor into the AD conversion module and converting it into a digital signal;

[0096] S6, digital signal processing, the digital signal processor receives the digital signal converted by the AD conversion module, performs online loop monitoring, and memorizes and records the resistance value of each loop in the open state;

[0097] S7, loop control, according to the recorded specific resistance value, the digital signal processor outputs the control signal to the DA conversion module, and the DA conversion module converts the digital signal into an analog control signal;

[0098] S8, switching the switch state, transmitting the analog control signal converted by the DA conversion module to the multi-way control switch, energizing the control circuit, switching the switch state, and when the switch state is switched to the open position, repeating steps S4 to S7, and measuring the resistance value again;

[0099] S9, through the loop resistance corresponding to the opening and closing state, the imported functional loop is traversed according to the loop resistance lookup table, to achieve online parameter identification, and find out the opening, closing and storage functional loops corresponding to each pin;

[0100] S10, automatic test of action voltage, step-by-step measurement of action voltage, converting step signals into continuous signals, automatically increasing voltage, and accurately detecting the action voltage of the switch;

[0101] S11, data recording, recording the action voltage and the resistance value of the aviation pin circuit into the memory;

[0102] S12, curve fitting, uses the recorded data to predict the aging curve through curve fitting to facilitate the analysis of the service life of the equipment;

[0103] S13, end the test. After completing all test steps, close the test device, export the test, and conduct subsequent analysis.

[0104] Specific work flow, such as Figure 6 As shown:

[0105] The aviation male pin is inserted into the aviation female pin in the instrument;

[0106] Apply equal differential voltage to the aircraft carrier pins and measure the current;

[0107] The analog quantity output by the current sensor is converted to digital quantity by the AD conversion module;

[0108] The digital quantity is input into the digital signal processor for online loop monitoring, the measurement results of the aviation pin loop resistance are memorized, the corresponding loop resistance values ​​of the open state are recorded, and then the single loop energy storage and closing signals of the multi-channel control switch are output for the loop with the specific resistance value input into the digital signal processor;

[0109] The digital signal processor DSP outputs the digital control quantity and transmits it to the DA conversion module;

[0110] The DA conversion module transmits the control analog quantity to the multi-channel control switch, energizes the aviation pin circuit and switches the switch state;

[0111] After the switch state is switched to the open position, the resistance measurement process is cycled again. After the measurement is completed, the corresponding opening and closing of the switch and energy storage are determined by traversal, completing the line selection process using the digital signal processor;

[0112] Adopt the voltage of step output, repeat the action twice, and measure the upper and lower limits of the opening and closing voltage;

[0113] According to the test logic imported by the digital signal processor, one-click measurement of the test content is completed;

[0114] The action voltage and aviation pin loop resistance value are recorded in the memory, and the aging curve is predicted by curve fitting.

[0115] The present invention has been innovatively optimized for the following five main problems:

[0116] The present invention innovatively adopts a female contact model that is fully matched with the male contact of the aviation plug to improve measurement accuracy, introduces DSP and AD / DA conversion modules to realize automatic circuit identification to simplify the test process, adds a voltage output module composed of an electrical circuit and a control circuit to realize automatic voltage control, and creates an integrated test equipment and an integrated storage system through programming logic to enhance data management and analysis capabilities, thereby comprehensively improving the efficiency and accuracy of the trolley switch test and realizing a one-stop, high-precision, automated test process.

[0117] The above implementation modes are not limitations of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the scope of the technical solution of the present invention also belong to the protection scope of the present invention.

Claims

1. A comprehensive test device for a trolley switch, characterized in that: include: Loop resistance measuring device, which performs voltage transformation measurement on the resistance of each aviation pin loop; The resistance sampling loop is connected to the loop resistance measuring device through the voltage dividing capacitor and the current sensor to obtain the resistance data; The AD conversion module is connected to the current sensor of the resistance sampling loop and receives the analog signal; A DA conversion module, connected to the multi-way control switch at the front end of the loop resistance measuring device, outputs an analog signal to formulate the separation and connection control of the measuring loop; The digital signal processor receives the digital signal input from the AD conversion module and outputs the processed digital control signal to the DA conversion module.

2. The comprehensive test device for the trolley switch according to claim 1 is characterized in that: The resistance sampling circuit comprises: 57V power supply G1; On / off switch SB1 for manual control of circuit; To prevent the circuit from overloading and causing a fault, the thermal protection switch S1 of the internal conducting circuit is cut off in time; Several voltage-dividing capacitors C that evenly distribute the power supply voltage to each pin; Several current sensors A for extracting current test loops.

3. The comprehensive test device for the trolley switch according to claim 2 is characterized in that: The 57V power supply G1, the momentary switch SB1, the thermal protection switch S1 and several voltage-dividing capacitors C are connected in series in sequence to form an internal conduction loop. Both ends of each voltage-dividing capacitor C are connected to a pin of a loop resistance measuring device to form several current test loops. Each current sensor is connected to a current test loop to measure the current of the current test loop when it is turned on. Each current sensor is connected to an AD conversion module.

4. The comprehensive test device for the trolley switch according to claim 3 is characterized in that: The aviation pin loop of the loop resistance measuring device comprises: 220V power supply G2; The inching contact switch S2 connects or disconnects the connection between the power supply and the sliding rheostat; Sliding rheostat R1, adjusts the voltage in each aviation pin circuit by changing the resistance value of the sliding rheostat; The multi-channel conversion controllable switch S3 is used to select different output paths and output the adjusted voltage to the pins of the aviation pin circuit to be tested.

5. The comprehensive test device for the trolley switch according to claim 4 is characterized in that: The 220V power supply G2 and the inching contact switch S2 are connected in series with one end connected to the fixed contact of the multi-way conversion controllable switch and the sliding rheostat, and the other end connected to the moving contact of the sliding rheostat, and the aviation pin is led out from the moving contact of the multi-way conversion controllable switch and the sliding rheostat.

6. The comprehensive test device for the trolley switch according to claim 5 is characterized in that: The multi-channel conversion controllable switch controls the aviation pin to access the DA conversion module.

7. The comprehensive test device for the trolley switch according to claim 6 is characterized in that: The moving contact of the sliding rheostat is connected to a DA conversion module.

8. The comprehensive test device for the trolley switch according to claim 7 is characterized in that: The aviation pins of the loop resistance measuring device adopt aircraft carrier pins, and are assembled into an aircraft carrier pin embedded panel equivalent to all the female pins inside the switch cabinet.

9. The comprehensive test device for the trolley switch according to claim 8, characterized in that: It also includes a memory for importing aging curves of the coil and the opening and closing springs, and the memory is connected to a digital signal processor.

10. A working method of a comprehensive test device for a trolley switch, characterized in that: A comprehensive test device comprising the trolley switch according to claim 9, wherein the working method comprises: S1, initialization, start the test device, initialize all modules and system parameters; S2, connect the test equipment, insert the aviation male pin into the aviation female pin, and ensure a good connection; S3, apply voltage, apply equal differential voltage to the aircraft carrier pin, and this voltage will gradually change according to the preset rule; S4, measure current, measure the current in the loop through the current sensor, and the sensor outputs an analog signal; S5, analog-to-digital conversion, inputting the analog signal of the current sensor into the AD conversion module and converting it into a digital signal; S6, digital signal processing, the digital signal processor receives the digital signal converted by the AD conversion module, performs online loop monitoring, and memorizes and records the resistance value of each loop in the open state; S7, loop control, according to the recorded specific resistance value, the digital signal processor outputs the control signal to the DA conversion module, and the DA conversion module converts the digital signal into an analog control signal; S8, switching the switch state, transmitting the analog control signal converted by the DA conversion module to the multi-way control switch, energizing the control circuit, switching the switch state, and when the switch state is switched to the open position, repeating steps S4 to S7, and measuring the resistance value again; S9, through the loop resistance corresponding to the opening and closing state, the imported functional loop is traversed according to the loop resistance lookup table, to achieve online parameter identification, and find out the opening, closing and storage functional loops corresponding to each pin; S10, automatic test of action voltage, step-by-step measurement of action voltage, converting step signals into continuous signals, automatically increasing voltage, and accurately detecting the action voltage of the switch; S11, data recording, recording the action voltage and the resistance value of the aviation pin circuit into the memory; S12, curve fitting, uses the recorded data to predict the aging curve through curve fitting to facilitate the analysis of the service life of the equipment; S13, end the test. After completing all test steps, close the test device, export the test, and conduct subsequent analysis.

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