AC contactor electrical life test method and device based on large-capacity electronic test products

Abstract

The present invention relates to an AC contactor electrical life test method and device based on a large-capacity electronic test sample. The device comprises a first circuit breaker, a second circuit breaker, a 1 / 6Ue transformer, a first electronic test sample, a second electronic test sample, a primary circuit contactor test sample group, a secondary circuit contactor test sample group, a primary circuit adjustable impedance load, a secondary circuit adjustable impedance load, a high-speed data acquisition card, a digital signal input circuit, a digital signal output circuit, a large current transformer and a small current transformer with different transformation ratios on a double circuit, and an industrial control computer. The industrial control computer drives the test samples in the primary circuit contactor test sample group and the secondary circuit contactor test sample group through the digital signal output circuit, and opens or closes them according to the test action mode required by AC3 or AC4. By adding a set of loads and a control circuit, simultaneous testing of test samples of different types and current specifications can be achieved, thereby improving the test efficiency and reducing the test cost.

Description

Technical Field

[0001] The invention relates to an electrical life test method and a device for an AC contactor based on a large-capacity electronic test product. Background Art

[0002] The double three test and single eight test sampling schemes for the contactor electrical life test require 3 and 8 test pieces respectively at a time, requiring a large power supply capacity. However, there are many types of AC contactor products. If the test type and test current are different, if you want to reduce the test time, you need to equip multiple test equipment, and the test cost is high. The existing patent number 201110152601.0 "AC contactor life test device and control method" adopts alternating cycle test technology, and tests multiple test pieces in turn in a single cycle test, so as to ensure that only one test piece is connected and disconnected at a certain time. The current operation test is completed with a single cycle test as a unit in the entire test process. The specified number of action cycle tests are completed, and the test time will not be extended. The defect of this alternating control technology is that when the test piece is subjected to an alternating cycle test, the electrical life test can only be performed on an AC contactor with a test current specification, and the test efficiency is low. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a test method and device for an AC contactor electrical life test device based on a large-capacity electronic companion test product, which adopts a multi-task control technology, adds a set of adjustable impedance loads and a control loop, and realizes time-sharing testing of test products with different current specifications in one test cycle.

[0004] In order to achieve the above purpose, the present invention adopts such an AC contactor electrical life test device based on a large-capacity electronic test product, including a first circuit breaker, a second circuit breaker, a 1 / 6Ue transformer, a first electronic test product, a second electronic test product, a primary circuit contactor test product group, a secondary circuit contactor test product group, a primary circuit adjustable impedance load and a secondary circuit adjustable impedance load. The three-phase AC power is divided into two branches after passing through the first circuit breaker, one branch is connected to the input end of the first electronic test product through a fuse combination, and the other branch is connected to the input end of the second electronic test product after being stepped down by the second circuit breaker and the 1 / 6Ue transformer. The output end of the first electronic test product and the output end of the second electronic test product are connected in parallel and then connected to the primary circuit contactor test product group. The rear end of the primary circuit contactor test product group is connected to the primary circuit adjustable impedance load circuit, and the parallel connection end of the output end of the first electronic test product and the output end of the second electronic test product is also connected to the secondary circuit adjustable impedance load circuit through the secondary circuit contactor test product group.

[0005] In particular, the AC contactor electrical life test device based on large-capacity electronic test products also includes

[0006] High-speed data acquisition card, used to detect coil voltage, coil current, test voltage and test current;

[0007] Digital signal input circuit, used for auxiliary contact switch status detection of the test products in the primary circuit contactor test group and the secondary circuit contactor test group;

[0008] The digital signal output circuit controls the solid-state relay group through the output interlock circuit and the output isolation circuit to drive the first electronic test product, the second electronic test product, the primary circuit contactor test product group, and the secondary circuit contactor test product group to open or close respectively;

[0009] A single-circuit high current detection transformer, a single-circuit low current detection transformer, a second-circuit high current detection transformer, and a second-circuit low current detection transformer having more than one transformation ratio;

[0010] And an industrial control computer, the industrial control computer drives the test products in the primary contactor test group and the secondary contactor test group through the digital signal output circuit, and opens or closes them according to the test action mode required by AC3 or AC4. The industrial control computer receives signal input from the high-speed data acquisition card and the digital signal input circuit, outputs the control signal to the digital signal output circuit, and drives the primary large current detection transformer ratio switching module, the primary small current detection transformer ratio switching module, the secondary large current detection transformer ratio switching module, and the secondary small current detection transformer ratio switching module through the thyristor control circuit to respectively realize the ratio switching of the primary large current detection transformer, the primary small current detection transformer, the secondary large current detection transformer, and the secondary small current detection transformer.

[0011] In particular, a single-circuit large current detection transformer is placed through the connecting line between the first electronic test product and the single-circuit contactor test product group, a single-circuit small current detection transformer is placed through the connecting line between the second electronic test product and the single-circuit contactor test product group, a second-circuit large current detection transformer is placed through the connecting line between the first electronic test product and the second-circuit contactor test product group, and a second-circuit small current detection transformer is placed through the connecting line between the second electronic test product and the second-circuit contactor test product group.

[0012] The present invention also provides an AC contactor electrical life test method based on a large-capacity electronic test product.

[0013] Step 1: Create a new test file;

[0014] Step 2: Set the test parameters and save them to the test file. The test parameters include

[0015] Test product information: input the test file according to the test product information. The test product information includes the model, rated current, and rated voltage of the test products in the primary contactor test product group and the secondary contactor test product group.

[0016] Test control parameters: according to the test control parameters, the actions of the test products in the primary circuit contactor test group and the secondary circuit contactor test group are controlled. The test control parameters include the number of test products, test connection current, breaking current, pull-in time, release time, operating frequency, power factor, and number of test cycles.

[0017] Test detection parameters, including coil voltage, coil current, test voltage, test current and auxiliary contact switch status,

[0018] Fault judgment parameters, including coil pull-in time over-limit threshold, coil release time over-limit threshold, main contact voltage drop upper limit threshold, main contact voltage drop lower limit threshold, perform fault analysis and judgment according to the fault judgment parameters;

[0019] Step 3: Adjust the control power supply of the test products in the primary circuit contactor test product group and the secondary circuit contactor test product group, as well as the primary circuit adjustable load impedance and the secondary circuit adjustable load impedance according to the test product information and test control parameters;

[0020] Step 4: Test control runs and starts the test, asking whether to start remote communication. When receiving a remote communication response, proceed to the next step;

[0021] Step 5: Determine the test mode of the test product. When the test mode of the test product is AC3, the program runs into the sixth step. When the test mode of the test product is AC4, the program runs into the seventh step. If the test mode of the test product is neither AC3 nor AC4, the program runs into other mode judgment execution modules.

[0022] Step 6: Include

[0023] The first sub-step is to switch the ratio of the primary circuit large current detection transformer, the primary circuit small current detection transformer, the secondary circuit large current detection transformer and the secondary circuit small current detection transformer according to the input test product information;

[0024] The second sub-step is connecting the first electronic test product;

[0025] The third sub-step is to start the high-speed data acquisition card, and the high-speed data acquisition card collects data on the coil voltage, coil current, main contact voltage and main contact current;

[0026] In the fourth sub-step, the Nth test coil of the primary circuit contactor test group and the secondary circuit contactor test group is energized, and the contacts are closed;

[0027] In the fifth sub-step, when the high current conduction time of the first electronic test product reaches a timing point, the first electronic test product is controlled to be disconnected, and at the same time, the second electronic test product is controlled to be turned on;

[0028] In the sixth sub-step, when the conduction time of the Nth test product in the test product group reaches the specified pull-in time in the test control parameters, the coil of the Nth test product in the test product group is controlled to lose power and the contact is disconnected;

[0029] The seventh sub-step is to control the second electronic test product to be disconnected, and then enter the eighth step;

[0030] Step 7: Include

[0031] The first sub-process is to switch the ratio of the primary circuit high current detection transformer and the secondary circuit high current detection transformer according to the input test product information;

[0032] In the second sub-process, the first electronic companion test product is connected;

[0033] The third sub-process is to start the high-speed data acquisition card, which collects data on the coil voltage, coil current, main contact voltage and main contact current;

[0034] In the fourth sub-process, the Nth test coil of the test group is energized and the contacts are closed;

[0035] In the fifth sub-process, when the conduction time of the Nth test product in the test product group reaches the specified pull-in time in the test control parameters, the coil of the Nth test product in the test product group is controlled to lose power and the contact is disconnected;

[0036] The sixth sub-process controls the disconnection of the first electronic test product and then enters the eighth step;

[0037] Step 8: Call the parameter calculation and waveform display module, read the test parameters collected by the high-speed data acquisition card into the program buffer, calculate the test parameters, and display the waveforms of the test voltage, test current, coil voltage, and coil current of the test product;

[0038] Step 9: Determine whether the state of the current test product is abnormal based on the collected test parameters. If abnormal, enter the fault handling procedure, determine the fault form of the test product, display the fault state of the test product, and accumulate the number of faults of the current test product. If the number reaches the set value, the test product will be eliminated; otherwise, enter the next step;

[0039] Step 10: Check whether the keyboard of the industrial control computer inputs the pause test command. If so, the program jumps to step 4. If not, go to the next step.

[0040] Step 11: Determine whether the test products in the primary contactor test group and the secondary contactor test group have completed a single test action cycle. If not, perform the connection or disconnection operation of the next test product, and the program jumps to step 5. If yes, accumulate the number of single test action cycles and proceed to the next step;

[0041] Step 12: Determine whether the number of single test action cycles has reached the set value. If the number has reached or all test products have failed, the test ends. If not, the program jumps to step 5.

[0042] Compared with the prior art, the beneficial technical effects created by the present invention are:

[0043] 1. By adding a set of loads and a control loop, different types of test products with different current specifications can be tested in a time-sharing manner in one test cycle, which improves the test efficiency and reduces the test cost;

[0044] 2. Real-time recording of test process data during the test can provide data resources for contactor life prediction;

[0045] 3. The primary circuit large current detection transformer, primary circuit small current detection transformer, secondary circuit large current detection transformer and secondary circuit small current detection transformer all have multiple gear ratios to ensure the accuracy of data collection;

[0046] 4. This test can also automatically detect product failures and use dual software and hardware protection to eliminate faulty products when a failure occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a primary electrical diagram of an embodiment of the present invention;

[0048] Figure 2 It is a control principle block diagram of the first part in an embodiment of the present invention;

[0049] Figure 3 is a control principle block diagram of the second part in an embodiment of the present invention;

[0050] Figure 4 It is a control principle block diagram of the third part in an embodiment of the present invention;

[0051] Figure 5 It is a flow control diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0052] like Figure 1As shown, an AC contactor electrical life test device based on a large-capacity electronic test product includes a first circuit breaker QF1, a second circuit breaker QF2, a 1 / 6Ue transformer T, a first electronic test product KS1, a second electronic test product KS2, a primary circuit contactor test product group 2, a secondary circuit contactor test product group 3, a primary circuit adjustable impedance load and a secondary circuit adjustable impedance load. The three-phase AC power L1, L2, and L3 are divided into two branches after passing through the first circuit breaker QF1, and one branch is connected to the input end of the first electronic test product KS1 through a fuse combination. , the other branch is connected to the input end of the second electronic test product KS2 after being stepped down by the second circuit breaker QF2 and the 1 / 6Ue transformer T, the output end of the first electronic test product KS1 and the output end of the second electronic test product KS2 are connected in parallel, and then connected to the first-circuit contactor test product group 2, the rear end of the first-circuit contactor test product group 2 is connected to the first-circuit adjustable impedance load circuit, and the parallel connection end of the output end of the first electronic test product KS1 and the output end of the second electronic test product KS2 is also connected to the second-circuit adjustable impedance load circuit through the second-circuit contactor test product group 3. Here, the first-circuit contactor test product group includes contactors SP1~SP3, the second-circuit contactor test product group includes contactors SP4~SP6, the first-circuit adjustable impedance load provides a load for the test products in the first-circuit contactor test product group 2, and the second-circuit adjustable impedance load provides a load for the test products in the second-circuit contactor test product group 3.

[0053] like Figure 2 , 3 As shown in 4, the AC contactor electrical life test device based on the large-capacity electronic test product also includes

[0054] High-speed data acquisition card 7, used for detecting coil voltage, coil current, test voltage and test current;

[0055] Digital signal input circuit 6, used for auxiliary contact switch status detection of the test products in primary circuit contactor test product group 2 and secondary circuit contactor test product group 3;

[0056] The digital signal output circuit 8 controls the solid-state relay group 83 through the output interlock circuit 81 and the output isolation circuit 82 to respectively drive the opening or closing of the first electronic test product KS1, the second electronic test product KS2, the primary circuit contactor test product group 2, and the secondary circuit contactor test product group 3;

[0057] A single-circuit high current detection transformer 1TA1, a single-circuit low current detection transformer 1TA2, a second-circuit high current detection transformer 2TA1, and a second-circuit low current detection transformer 2TA2 having more than one transformation ratio;

[0058] And an industrial control computer 1, the industrial control computer 1 drives the samples in the primary contactor sample group 2 and the secondary contactor sample group 3 through the digital signal output circuit 8, and opens or closes them according to the test action mode required by AC3 or AC4. The industrial control computer 1 receives signal input from the high-speed data acquisition card 7 and the digital signal input circuit 6, outputs a control signal to the digital signal output circuit 8, and drives the primary large current detection transformer ratio switching module 8a, the primary small current detection transformer ratio switching module 8b, the secondary large current detection transformer ratio switching module 8c, and the secondary small current detection transformer ratio switching module 8d through the thyristor control circuit to respectively realize the ratio switching of the primary large current detection transformer 1TA1, the primary small current detection transformer 1TA2, the secondary large current detection transformer 2TA1, and the secondary small current detection transformer 2TA2.

[0059] Here, the transformation ratios of the single-circuit large current detection transformer 1TA1 are 7500 / 5, 2000 / 5, and 500 / 5, respectively; the transformation ratios of the single-circuit small current detection transformer 1TA2 are 750 / 5, 200 / 5, and 50 / 5, respectively; the transformation ratios of the second-circuit large current detection transformer 2TA1 are 1500 / 5, 500 / 5, and 150 / 5, respectively; and the transformation ratios of the second-circuit small current detection transformer 2TA2 are 250 / 5, 75 / 5, and 25 / 5, respectively.

[0060] The primary-circuit large-current detection transformer 1TA1 is placed in the connecting line between the first electronic test product KS1 and the primary-circuit contactor test product group 2, the primary-circuit small-current detection transformer 1TA2 is placed in the connecting line between the second electronic test product KS2 and the primary-circuit contactor test product group 2, the secondary-circuit large-current detection transformer 2TA1 is placed in the connecting line between the first electronic test product KS1 and the secondary-circuit contactor test product group 3, and the secondary-circuit small-current detection transformer 2TA2 is placed in the connecting line between the second electronic test product KS2 and the secondary-circuit contactor test product group 3.

[0061] like Figure 5 As shown in the figure, an AC contactor electrical life test method based on a large-capacity electronic test product is

[0062] Step 101: Create a new test file;

[0063] Step 2 102: Set the test parameters and save the test parameters to the test file. The test parameters include

[0064] Test product information: input the test file according to the test product information. The test product information includes the model, rated current, and rated voltage of the test products in the primary contactor test product group 2 and the secondary contactor test product group 3.

[0065] Test control parameters: according to the test control parameters, the actions of the test products in the primary circuit contactor test product group 2 and the secondary circuit contactor test product group 3 are controlled. The test control parameters include the number of test products, test connection current, breaking current, pull-in time, release time, operating frequency, power factor, and number of test cycles.

[0066] Test detection parameters, including coil voltage, coil current, test voltage, test current and auxiliary contact switch status,

[0067] Fault judgment parameters, including coil pull-in time over-limit threshold, coil release time over-limit threshold, main contact voltage drop upper limit threshold, main contact voltage drop lower limit threshold, perform fault analysis and judgment according to the fault judgment parameters;

[0068] Step 3 103: adjusting the control power supply of the test products in the primary circuit contactor test product group 2 and the secondary circuit contactor test product group 3, as well as the primary circuit adjustable load impedance and the secondary circuit adjustable load impedance according to the test product information and the test control parameters;

[0069] Step 4 104, 105, 106: the test control runs and starts the test, inquiring whether to start remote communication, and when receiving a remote communication response, proceeding to the next step;

[0070] Step 5 107: Determine the test mode of the test product. When the test mode of the test product is AC3, the program runs into step 6. When the test mode of the test product is AC4, the program runs into step 7. If the test mode of the test product is neither AC3 nor AC4, the program runs into other mode determination execution modules.

[0071] Step 6: Include

[0072] The first sub-step 109 is to switch the transformation ratio of the primary circuit large current detection transformer 1TA1, the primary circuit small current detection transformer 1TA2, the secondary circuit large current detection transformer 2TA1 and the secondary circuit small current detection transformer 2TA2 according to the input test product information;

[0073] The second sub-step 1091 is to connect the first electronic test piece KS1;

[0074] The third sub-step 1092 is to start the high-speed data acquisition card 7, and the high-speed data acquisition card 7 collects data on the coil voltage, coil current, main contact voltage and main contact current;

[0075] In the fourth sub-step 1093, the SPN coil of the Nth test product of the primary circuit contactor test product group 2 and the secondary circuit contactor test product group 3 is energized, and the contacts are closed;

[0076] The fifth sub-steps 1094 and 1095, when the high current conduction time of the first electronic test product KS1 reaches the timing point, the first electronic test product KS1 is controlled to be disconnected, and at the same time, the second electronic test product KS2 is controlled to be turned on;

[0077] The sixth sub-step 1096, when the conduction time of the Nth test SPN of the test group reaches the specified pull-in time in the test control parameters, the coil of the Nth test SPN of the test group is controlled to lose power and the contact is disconnected;

[0078] The seventh sub-step 1097, after controlling the second electronic test piece KS2 to be disconnected, enter the eighth step 111;

[0079] Step 7: Include

[0080] The first sub-process 110 is to switch the transformation ratio of the primary circuit high current detection transformer 1TA1 and the secondary circuit high current detection transformer 2TA1 according to the input test product information;

[0081] In the second sub-process 1101, the first electronic test product KS1 is connected;

[0082] The third sub-process 1102 starts the high-speed data acquisition card 7, and the high-speed data acquisition card 7 collects data on the coil voltage, coil current, main contact voltage and main contact current;

[0083] In the fourth sub-process 1103, the SPN coil of the Nth test sample in the test sample group is energized and the contact is closed;

[0084] The fifth sub-process 1104, when the conduction time of the Nth test SPN in the test group reaches the specified pull-in time in the test control parameters, the coil of the Nth test SPN in the test group is controlled to lose power and the contact is disconnected;

[0085] The sixth sub-process 1105 controls the first electronic test product KS1 to be disconnected and then enters the eighth step 111;

[0086] Step 8 111: calling the parameter calculation and waveform display module, reading the test detection parameters collected by the high-speed data acquisition card 7 into the program buffer, calculating the test detection parameters, and displaying the waveforms of the test voltage, test current, coil voltage, and coil current of the test product;

[0087] Ninth step 112, 113: judging whether the state of the current test product is abnormal according to the collected test detection parameters, if abnormal, entering the fault handling procedure 114, judging the fault form of the test product, displaying the fault state of the test product, accumulating the number of faults of the current test product, and rejecting the test product if the number reaches the set value; otherwise, entering the next step;

[0088] Step 10 115: Check whether the keyboard of the industrial control computer inputs the pause test instruction. If so, the program jumps to the fourth steps 104, 105, and 106. If not, proceed to the next step.

[0089] Step 116: Determine whether the samples in the primary contactor sample group 2 and the secondary contactor sample group 3 have completed a single test action cycle. If not, perform a connection or disconnection operation on the next sample, and the program jumps to step 107. If yes, the number of single test action cycles is accumulated, and the next step is entered.

[0090] Step 12 118 : Determine whether the number of single test action cycles reaches the set value. If the number has reached or all test products have failed, the test ends. If not, the program jumps to step 5 107 .

Claims

1. An AC contactor electrical life test method based on a large-capacity electronic test product, characterized in that: Step 1: Create a new test file; Step 2: Set the test parameters and save them to the test file. The test parameters include Test product information: input the test file according to the test product information. The test product information includes the model, rated current, and rated voltage of the test products in the primary contactor test product group and the secondary contactor test product group. Test control parameters: according to the test control parameters, the actions of the test products in the primary circuit contactor test group and the secondary circuit contactor test group are controlled. The test control parameters include the number of test products, test connection current, breaking current, pull-in time, release time, operating frequency, power factor, and number of test cycles. Test detection parameters, including coil voltage, coil current, test voltage, test current and auxiliary contact switch status, Fault judgment parameters, including coil pull-in time over-limit threshold, coil release time over-limit threshold, main contact voltage drop upper limit threshold, main contact voltage drop lower limit threshold, perform fault analysis and judgment according to the fault judgment parameters; Step 3: Adjust the control power supply of the test products in the primary circuit contactor test product group and the secondary circuit contactor test product group, as well as the primary circuit adjustable load impedance and the secondary circuit adjustable load impedance according to the test product information and test control parameters; Step 4: Test control runs and starts the test, asking whether to start remote communication. When receiving a remote communication response, proceed to the next step; Step 5: Determine the test mode of the test product. When the test mode of the test product is AC3, the program runs into the sixth step. When the test mode of the test product is AC4, the program runs into the seventh step. If the test mode of the test product is neither AC3 nor AC4, the program runs into other mode judgment execution modules. Step 6: Include The first sub-step is to switch the ratio of the primary circuit large current detection transformer, the primary circuit small current detection transformer, the secondary circuit large current detection transformer and the secondary circuit small current detection transformer according to the input test product information; The second sub-step is connecting the first electronic test product; The third sub-step is to start the high-speed data acquisition card, and the high-speed data acquisition card collects data on the coil voltage, coil current, main contact voltage and main contact current; In the fourth sub-step, the Nth test coil of the primary circuit contactor test group and the secondary circuit contactor test group is energized, and the contacts are closed; In the fifth sub-step, when the high current conduction time of the first electronic test product reaches a timing point, the first electronic test product is controlled to be disconnected, and at the same time, the second electronic test product is controlled to be turned on; In the sixth sub-step, when the conduction time of the Nth test product in the test product group reaches the specified pull-in time in the test control parameters, the coil of the Nth test product in the test product group is controlled to lose power and the contact is disconnected; The seventh sub-step is to control the second electronic test product to be disconnected, and then enter the eighth step; Step 7: Include The first sub-process is to switch the ratio of the primary circuit high current detection transformer and the secondary circuit high current detection transformer according to the input test product information; In the second sub-process, the first electronic companion test product is connected; The third sub-process is to start the high-speed data acquisition card, which collects data on the coil voltage, coil current, main contact voltage and main contact current; In the fourth sub-process, the Nth test coil of the test group is energized and the contacts are closed; In the fifth sub-process, when the conduction time of the Nth test product in the test product group reaches the specified pull-in time in the test control parameters, the coil of the Nth test product in the test product group is controlled to lose power and the contact is disconnected; The sixth sub-process controls the disconnection of the first electronic test product and then enters the eighth step; Step 8: Call the parameter calculation and waveform display module, read the test parameters collected by the high-speed data acquisition card into the program buffer, calculate the test parameters, and display the waveforms of the test voltage, test current, coil voltage, and coil current of the test product; Step 9: Determine whether the state of the current test product is abnormal based on the collected test parameters. If abnormal, enter the fault handling procedure, determine the fault form of the test product, display the fault state of the test product, and accumulate the number of faults of the current test product. If the number reaches the set value, the test product will be eliminated; otherwise, enter the next step; Step 10: Check whether the keyboard of the industrial control computer inputs the pause test command. If so, the program jumps to step 4. If not, go to the next step. Step 11: Determine whether the test products in the primary contactor test group and the secondary contactor test group have completed a single test action cycle. If not, perform the connection or disconnection operation of the next test product, and the program jumps to step 5. If yes, accumulate the number of single test action cycles and proceed to the next step; Step 12: Determine whether the number of single test action cycles reaches the set value. If the number has reached or all test products have failed, the test ends. If not, the program jumps to step 5. The test device used in the method includes a first circuit breaker, a second circuit breaker, a 1 / 6Ue transformer, a first electronic test product, a second electronic test product, a primary contactor test product group, a secondary contactor test product group, a primary adjustable impedance load and a secondary adjustable impedance load. The three-phase AC is divided into two branches after passing through the first circuit breaker, one branch is connected to the input end of the first electronic test product through a fuse combination, and the other branch is connected to the input end of the second electronic test product after being stepped down by the second circuit breaker and the 1 / 6Ue transformer. The output end of the first electronic test product and the output end of the second electronic test product are connected in parallel and then connected to the primary contactor test product group. The rear end of the primary contactor test product group is connected to the primary adjustable impedance load circuit, and the parallel connection end of the output end of the first electronic test product and the output end of the second electronic test product is also connected to the secondary adjustable impedance load circuit through the secondary contactor test product group.

2. The AC contactor electrical life test method based on a large-capacity electronic test product according to claim 1 is characterized in that: The AC contactor electrical life test device based on large-capacity electronic test products also includes High-speed data acquisition card, used to detect coil voltage, coil current, test voltage and test current; Digital signal input circuit, used for auxiliary contact switch status detection of the test products in the primary circuit contactor test group and the secondary circuit contactor test group; The digital signal output circuit controls the solid-state relay group through the output interlock circuit and the output isolation circuit to drive the first electronic test product, the second electronic test product, the primary circuit contactor test product group, and the secondary circuit contactor test product group to open or close respectively; A single-circuit high current detection transformer, a single-circuit low current detection transformer, a second-circuit high current detection transformer, and a second-circuit low current detection transformer having more than one transformation ratio; And an industrial control computer, the industrial control computer drives the test products in the primary contactor test group and the secondary contactor test group through the digital signal output circuit, and opens or closes them according to the test action mode required by AC3 or AC4. The industrial control computer receives signal input from the high-speed data acquisition card and the digital signal input circuit, outputs the control signal to the digital signal output circuit, and drives the primary large current detection transformer ratio switching module, the primary small current detection transformer ratio switching module, the secondary large current detection transformer ratio switching module, and the secondary small current detection transformer ratio switching module through the thyristor control circuit to respectively realize the ratio switching of the primary large current detection transformer, the primary small current detection transformer, the secondary large current detection transformer, and the secondary small current detection transformer.

3. The AC contactor electrical life test method based on a large-capacity electronic test product according to claim 2 is characterized in that: The primary circuit large current detection transformer is placed through the connecting line between the first electronic test product and the primary circuit contactor test product group, the primary circuit small current detection transformer is placed through the connecting line between the second electronic test product and the primary circuit contactor test product group, the secondary circuit large current detection transformer is placed through the connecting line between the first electronic test product and the secondary circuit contactor test product group, and the secondary circuit small current detection transformer is placed through the connecting line between the second electronic test product and the secondary circuit contactor test product group.

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