A fully automatic insulation withstand voltage test device for high-voltage instrument transformers

Abstract

The present invention discloses a fully automatic high-voltage transformer insulation withstand voltage test device, which includes an aluminum profile frame. A high-voltage switching pneumatic device, a primary side wiring mechanism of the transformer, high-voltage conductive copper bars, a secondary side wiring mechanism of the transformer, an electrical measurement function module, a roller conveyor line, and electrical measurement instruments are arranged on the aluminum profile frame. The present invention has high efficiency in integration and a small floor area. The device proposed in this solution can successively carry out insulation resistance measurement, power frequency withstand voltage test on high-voltage current transformers and high-voltage voltage transformers, and also take into account the induction withstand voltage test, error test, and excitation characteristic test of high-voltage voltage transformers. It integrates the insulation withstand voltage test of current transformers and the full inspection and acceptance test of voltage transformers. It is applicable to the verification of high-voltage transformers.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage metering detection, and specifically to a fully automatic insulation withstand voltage test device for high-voltage transformers. Background Technique

[0002] The demand for high-voltage transformers has increased with the further expansion of the market, and the detection of high-voltage transformers is facing increasing pressure. At present, the detection methods for high-voltage transformers are inefficient, and the management and control means are backward, and a set of safe and effective centralized integrated control scheme has not been formed. In the current industry, the test devices generally have problems such as single function, separate sets, and incomplete equipment configuration functions, resulting in the inability to carry out all the tests required for the insulation withstand voltage test of high-voltage transformers. To complete all the insulation withstand voltage tests, detection devices for each test need to be equipped. During the test, manual handling work is also required between different detection devices, which will inevitably increase the equipment purchase cost and labor cost. At the same time, the switching between different tests requires manual repeated disconnection and connection of wires, which inevitably increases the safety hazards of personnel operation and the test error rate caused by wiring deviation. Summary of the Invention

[0003] The purpose of the present invention is to provide a fully automatic insulation withstand voltage test device for high-voltage transformers.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A fully automatic insulation withstand voltage test device for high-voltage transformers, including an aluminum profile frame, on which a high-voltage switching pneumatic device, a primary side wiring mechanism of the transformer, a high-voltage conductive copper bar, a secondary side wiring mechanism of the transformer, an electrical measurement function module, a roller conveyor line, and an electrical measuring instrument are provided;

[0005] The high-voltage switching pneumatic device is fixedly installed on the inner wall of the aluminum profile frame, and the high-voltage switching pneumatic device is located above the electrical measuring instrument;

[0006] The primary side wiring mechanism of the transformer includes a guide rod 1, a guide rod cylinder 1, a crimping cylinder, an insulator, an insulation withstand voltage contact terminal, and an error test contact terminal. The guide rod 1 and the guide rod cylinder 1 are both installed on the crimping cylinder. The insulator is installed at the lower end of the crimping cylinder. The insulation withstand voltage contact terminal and the error test contact terminal are both installed below the insulator;

[0007] The high-voltage conductive copper bar is fixedly installed on the inner wall of the aluminum profile frame, and the high-voltage conductive copper bar is located behind the high-voltage switching pneumatic device;

[0008] The secondary side wiring mechanism of the transformer includes a guide rod cylinder 2, a guide rod 2, and a secondary side contact terminal of the transformer;

[0009] The second guide rod cylinder is installed on the mounting seat. The telescopic end of the second guide rod cylinder and the second guide rod are both installed on the profile bracket body. The secondary side contact terminal of the mutual inductor is installed above and below the profile bracket body;

[0010] The electrical measurement function module includes an error switching module, a power frequency withstand voltage switching module, a leakage current acquisition module, a power output detection module, a module power supply, a secondary withstand voltage protection module, an induced withstand voltage switching module, a secondary voltage test module, a contactor 1, a contactor 2, a contactor 3, and a contactor 4;

[0011] The electrical measurement instrument includes a programmable power source, a self-boosting standard voltage mutual inductor, a 5 kV test transformer, a capacitance voltage divider, and a 50 kV test transformer. The contactor 1 is signal-connected to the 50 kV test transformer. The contactor 2 is signal-connected to the 5 kV test transformer. The contactor 3 is signal-connected to the self-boosting standard voltage mutual inductor. The contactor 4 is signal-connected to the programmable power source.

[0012] The roller conveyor line is fixedly installed on the inner wall of the aluminum profile frame and is located below the secondary side wiring mechanism of the mutual inductor.

[0013] Preferably, the insulation withstand voltage contact terminal and the error test contact terminal have the same structure.

[0014] Preferably, the contactor 1, the contactor 2, the contactor 3, and the contactor 4 are installed in sequence from left to right.

[0015] Preferably, the number of the leakage current acquisition module and the module power supply is two each.

[0016] Preferably, the power frequency withstand voltage switching module is installed above the induced withstand voltage switching module.

[0017] Preferably, the error switching module is installed above the secondary withstand voltage protection module.

[0018] Preferably, the capacitance voltage divider is installed above the 50 kV test transformer.

[0019] Preferably, the number of the mounting seats is three, and the number of the second guide rods is two. The two mounting seats are respectively sleeved on the two second guide rods.

[0020] The present invention provides a fully automatic high-voltage mutual inductor insulation withstand voltage test device, which has the following beneficial effects:

[0021] 1. High-efficiency integration and small floor area. The device proposed in this solution can successively conduct insulation resistance measurements (insulation resistance between the primary winding and the secondary and ground, insulation resistance between the secondary winding and the ground) and power frequency withstand voltage tests (power frequency withstand voltage test between the primary and the secondary and ground, power frequency withstand voltage test between the secondary winding and the ground) on high-voltage current transformers and high-voltage voltage transformers, and also take into account the induction withstand voltage test, error test, and excitation characteristic test of high-voltage voltage transformers. It integrates the insulation withstand voltage test of current transformers and the full inspection and acceptance test of voltage transformers.

[0022] 2. High degree of automation. It can achieve automatic transfer, automatic conveying, automatic connection and disconnection of wires, automatic test switching, and automatic upload of test data for high-voltage transformers, realizing centralized management, high reliability, and fully automatic completion of all tests.

[0023] 3. Low hardware cost. Since most of the test circuits for insulation withstand voltage tests and error tests of high-voltage voltage transformers can be shared, the reuse of equipment and circuits is greatly improved, reducing the hardware cost.

[0024] 4. Reduced human participation and safer. The device provided by the present invention can achieve automatic transfer, automatic conveying, automatic connection and disconnection of wires, and automatic test switching of high-voltage transformers, without human participation, avoiding potential safety hazards in the tests.

[0025] 5. High accuracy of test data. The device provided by the present invention uses a flexible crimping mechanism to achieve reliable contact between the test end and the test object, ensuring the accuracy of test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a perspective view of the present invention;

[0027] Figure 2 is a front view of the present invention;

[0028] Figure 3 is a left view of the present invention;

[0029] Figure 4 is a schematic structural diagram of the electrical measurement function module of the present invention;

[0030] Figure 5 is a schematic structural diagram of the primary side wiring mechanism of the transformer of the present invention;

[0031] Figure 6 is a schematic structural diagram of the secondary side wiring mechanism of the transformer of the present invention;

[0032] Figure 7 is a schematic layout diagram of the electrical measurement instruments of the present invention;

[0033] Figure 8 is a schematic test principle diagram of the present invention.

[0034] In the figure: 1 aluminum profile frame, 2 high-voltage switching pneumatic device, 3 primary side wiring mechanism of the mutual inductor, 31 first guide rod, 32 first guide rod cylinder, 33 crimping cylinder, 34 insulator, 35 insulation withstand voltage contact terminal, 36 error test contact terminal, 4 high-voltage conductive copper busbar, 5 secondary side wiring mechanism of the mutual inductor, 51 second guide rod cylinder, 52 second guide rod, 53 secondary side contact terminal of the mutual inductor, 6 electrical measurement function module, 61 error switching module, 62 power frequency withstand voltage switching module, 63 leakage current acquisition module, 64 power output detection module, 65 module power supply, 66 secondary withstand voltage protection module, 67 induced withstand voltage switching module, 68 secondary voltage test module, 69 first contactor, 610 second contactor, 611 third contactor, 612 fourth contactor, 7 roller conveyor line, 8 electrical measurement instrument, 81 programmed power source, 82 self-boosting standard voltage mutual inductor, 83 5 kV test transformer, 84 capacitive voltage divider, 85 50 kV test transformer. Specific implementation mode

[0035] As Figure 1-8 shown, the present invention provides a technical solution: a fully automatic high-voltage mutual inductor insulation withstand voltage test device, including an aluminum profile frame 1, on which a high-voltage switching pneumatic device 2, a primary side wiring mechanism 3 of the mutual inductor, a high-voltage conductive copper busbar 4, a secondary side wiring mechanism 5 of the mutual inductor, an electrical measurement function module 6, a roller conveyor line 7 and an electrical measurement instrument 8 are provided;

[0036] The high-voltage switching pneumatic device 2 is fixedly installed on the inner wall of the aluminum profile frame 1, and the high-voltage switching pneumatic device 2 is located above the electrical measurement instrument 8;

[0037] The primary side wiring mechanism 3 of the mutual inductor includes a first guide rod 31, a first guide rod cylinder 32, a crimping cylinder 33, an insulator 34, an insulation withstand voltage contact terminal 35 and an error test contact terminal 36. The first guide rod 31 and the first guide rod cylinder 32 are both installed on the crimping cylinder 33. The insulator 34 is installed at the lower end of the crimping cylinder 33. The insulation withstand voltage contact terminal 35 and the error test contact terminal 36 are both installed below the insulator 34, and the insulation withstand voltage contact terminal 35 and the error test contact terminal 36 have the same structure.

[0038] The high-voltage conductive copper busbar 4 is fixedly installed on the inner wall of the aluminum profile frame 1, and the high-voltage conductive copper busbar 4 is located behind the high-voltage switching pneumatic device 2.

[0039] The secondary side wiring mechanism 5 of the mutual inductor includes a second guide rod cylinder 51, a second guide rod 52 and a secondary side contact terminal 53 of the mutual inductor;

[0040] The second guide rod cylinder 51 is installed on the mounting seat. The telescopic end of the second guide rod cylinder 51 and the second guide rod 52 are both installed on the profile bracket body. The secondary side contact terminal 53 of the mutual inductor is installed above and below the profile bracket body. The number of mounting seats is three, and the number of the second guide rods 52 is two. The two mounting seats are respectively sleeved on the two second guide rods 52.

[0041] The electrical measurement function module 6 includes an error switching module 61, a power frequency withstand voltage switching module 62, a leakage current acquisition module 63, a power output detection module 64, a module power supply 65, a secondary withstand voltage protection module 66, an induced withstand voltage switching module 67, a secondary voltage test module 68, a first contactor 69, a second contactor 610, a third contactor 611, and a fourth contactor 612. The first contactor 69, the second contactor 610, the third contactor 611, and the fourth contactor 612 are installed in sequence from left to right. The number of both the leakage current acquisition module 63 and the module power supply 65 is two. The power frequency withstand voltage switching module 62 is installed above the induced withstand voltage switching module 67, and the error switching module 61 is installed above the secondary withstand voltage protection module 66.

[0042] The roller conveyor line 7 is fixedly installed on the inner wall of the aluminum profile frame 1, and the roller conveyor line 7 is located below the secondary side wiring mechanism 5 of the mutual inductor.

[0043] The electrical measurement instrument 8 includes a programmable power source 81, a self-boosting standard voltage mutual inductor 82, a 5 kV test transformer 83, a capacitive voltage divider 84, and a 50 kV test transformer 85. The first contactor 69 is signal-connected to the 50 kV test transformer 85, the second contactor 610 is signal-connected to the 5 kV test transformer 83, the third contactor 611 is signal-connected to the self-boosting standard voltage mutual inductor 82, the fourth contactor 612 is signal-connected to the programmable power source 81, and the capacitive voltage divider 84 is installed above the 50 kV test transformer 85.

[0044] During use, the fully automatic high-voltage mutual inductor insulation withstand voltage test device can sequentially carry out insulation resistance measurement (insulation resistance between the primary winding and the secondary and ground, insulation resistance between the secondary winding and the ground), power frequency withstand voltage test (power frequency withstand voltage test between the primary and the secondary and ground, power frequency withstand voltage test between the secondary winding and the ground) on the high-voltage current mutual inductor and the high-voltage voltage mutual inductor, and also take into account the induced withstand voltage test, error test, and excitation characteristic test of the high-voltage voltage mutual inductor. After the measured mutual inductor enters the test unit, it can automatically complete the primary and secondary wiring of the tested mutual inductor, automatically connect the corresponding test equipment according to the test items and carry out the corresponding tests of the above items, and automatically upload the test data.

[0045] When conducting the insulation resistance test between the primary winding and the secondary and ground, a method of taking 6 tested products (high-voltage current mutual inductor or high-voltage voltage mutual inductor) in place at one time and sequentially verifying is adopted.

[0046] The test sample is conveyed to the power frequency withstand voltage and insulation resistance verification station by the roller conveyor line 7. After the test sample is positioned.

[0047] Start the secondary side wiring mechanism 5 of the mutual inductor to conduct secondary side wiring. In the power frequency withstand voltage switching module 62, the high-voltage relays GK1 and GK2 are disconnected, GK3 is disconnected, and GK4 is energized (for stations 1... 6, it corresponds to the disconnection of high-voltage relay GK3 and the energization of GK4... the disconnection of high-voltage relay GK13 and the energization of GK14 in the power frequency withstand voltage switching module 62 in sequence), so that the secondary terminal of the mutual inductor is connected to the ground together.

[0048] After the insulating withstand voltage contact terminal 35 on the primary side of the mutual inductor is closed by the high-voltage switching pneumatic device 2, it is connected to the 2500V DC output terminal of the insulation resistance tester. Then start the primary side wiring mechanism 3 of the mutual inductor to press down in sequence.

[0049] After each group of pressing down is completed, the insulation resistance tester starts the insulation resistance test, reads the data and uploads it to the industrial control computer.

[0050] In this way, the measurement of the insulation resistance of 6 test samples and the data upload are completed in sequence.

[0051] After the experiment is over, the wiring mechanism resets automatically.

[0052] When the insulation resistance test between the primary and secondary sides and the ground of the test sample is qualified, the software automatically enters the insulation resistance test process between the secondary winding and the ground, and the same method of 6 test samples being in place at one time and being verified in sequence is adopted.

[0053] The primary side wiring mechanism 3 of the mutual inductor is disconnected from the primary side of the mutual inductor, keeping the pressing state of the secondary side wiring mechanism 5 of the mutual inductor. The high-voltage switching pneumatic device 2 is disconnected, and the secondary side contact terminal of the mutual inductor is connected to the 500V DC output terminal of the insulation resistance tester through the power frequency withstand voltage switching module 62.

[0054] The secondary side wiring mechanism 5 of the mutual inductor is pressed on the secondary terminal of the mutual inductor. In the power frequency withstand voltage switching module 62, the high-voltage relay GK1 is energized, GK2 is disconnected, GK3 is energized, and GK4 is disconnected (for stations 1... 6, it corresponds to the energization of high-voltage relay GK3 and the disconnection of GK4... the energization of high-voltage relay GK13 and the disconnection of GK14 in the power frequency withstand voltage switching module 62 in sequence), so that the secondary terminal of the mutual inductor is disconnected from the ground.

[0055] Start the insulation resistance tester to start the insulation resistance test. When testing at station 1, the high-voltage relay GK3 in the power frequency withstand voltage switching module 62 is closed and GK4 is open; when testing at station 2, the high-voltage relays GK3 and GK4 in the power frequency withstand voltage switching module 62 are open, GK5 is closed and GK6 is open; when testing at station 3, the high-voltage relays GK3, GK4, GK5, and GK6 in the power frequency withstand voltage switching module 62 are open, GK7 is closed and GK8 is open; for stations 4, 5, and 6, do it in sequence, read the data and upload it to the industrial control computer.

[0056] In this way, the measurement of the insulation resistance of 6 test products and the data upload are completed in sequence.

[0057] After the experiment is over, the wiring mechanism resets automatically.

[0058] When performing a power frequency withstand voltage test between the primary and the ground, 6 test products (high-voltage current transformers or high-voltage voltage transformers) are transported by the roller conveyor line 7 to the power frequency withstand voltage insulation resistance verification station. After the test products are positioned, start the 6 groups of primary side wiring mechanisms 3 of the transformers and the secondary side wiring mechanisms 5 of the transformers to perform the primary and secondary wiring of the test products.

[0059] The primary side insulation withstand voltage contact terminal 35 of the transformer is connected to the high-voltage output terminal of the 50 kV test transformer through the current-limiting resistor R1 (corresponding to the current-limiting resistors R1, R4, R7, R10, R13, and R16 for stations 1... station 6 in sequence), the high-voltage switching pneumatic device 2.

[0060] The secondary side wiring mechanism 5 of the transformer is crimped on the secondary terminal of the transformer. The high-voltage relays GK1 and GK2 in the power frequency withstand voltage switching module 62 are open, GK3 is open and GK4 is closed (corresponding to the high-voltage relays GK3 open and GK4 closed... high-voltage relays GK13 open and GK14 closed in the power frequency withstand voltage switching module 62 for stations 1... station 6 in sequence), so that the secondary terminal of the transformer is connected to the ground together.

[0061] After the wiring of 6 transformers is completed, the software sets the boost voltage value and the leakage current protection value. The industrial control computer sends an instruction to the main control calibrator, connects the 50 kV test transformer 85 to the program-controlled source 81 through the on-contactor 69 to perform the boost operation. The leakage current acquisition module measures the leakage current. The capacitive voltage divider 84 is used to monitor the test voltage. When the specified voltage is reached, maintain the voltage for the set time. During this time, if the leakage current is less than the leakage current protection value, it can be determined that the test transformer is qualified.

[0062] After the experiment is over, the wiring mechanism resets automatically.

[0063] When the test specimen breaks down, the leakage current acquisition module will detect a sudden change in the current of the mutual inductor. The current-limiting resistor R1 will limit the breakdown current, playing a protective role to prevent equipment damage and flashover. The control circuit will disconnect the corresponding test specimen through the high-voltage switching pneumatic device 2 according to the detected leakage current value, and the mutual inductor station where breakdown occurs will be displayed on the software interface of the industrial control computer.

[0064] When the power frequency withstand voltage test between the primary and secondary windings and the ground of the test specimen is qualified, the software will automatically enter the power frequency withstand voltage test process between the secondary winding and the ground.

[0065] The primary side wiring mechanisms 3 of the 6 groups of mutual inductors are disconnected from the primary of the mutual inductors, and the secondary side wiring mechanisms 5 of the mutual inductors are kept in the crimping state. The secondary contact terminals of the mutual inductors are connected to the high-voltage output terminal of the 5kV test transformer 83 through the current-limiting resistors R3 (for station 1... station 6, corresponding to current-limiting resistors R3, R6, R9, R12, R15, R18 in sequence) and the power frequency withstand voltage switching module 62.

[0066] The secondary side wiring mechanism 5 of the mutual inductor is crimped on the secondary terminals of the mutual inductor. In the power frequency withstand voltage switching module 62, the high-voltage relay GK1 is disconnected and GK2 is energized, GK3 is energized and GK4 is disconnected (for station 1... station 6, corresponding to the high-voltage relay GK3 being energized and GK4 being disconnected... the high-voltage relay GK13 being energized and GK14 being disconnected in the power frequency withstand voltage switching module 62 in sequence), disconnecting the secondary terminals of the mutual inductor from the ground.

[0067] After the wiring of the 6 mutual inductors is completed, the software sets the voltage boost value of the 5kV test transformer 83 and the leakage current protection value. The industrial control computer sends an instruction to the main control calibrator, and the 5kV test transformer 83 is connected to the program-controlled power source 81 through the on-off contactor 610 for voltage boosting operation. The leakage current acquisition module measures the leakage current. When the specified voltage is reached, the voltage is maintained for the set time. If the leakage current is less than the leakage current protection value within this time, it can be determined that the tested mutual inductor is qualified.

[0068] After the experiment is over, the wiring mechanism will automatically reset.

[0069] When the test specimen breaks down, the leakage current acquisition module will detect a sudden change in the current of the mutual inductor. The current-limiting resistor R3 will limit the breakdown current, playing a protective role to prevent equipment damage and flashover. The control circuit will disconnect the corresponding test specimen through the high-voltage switching pneumatic device 2 according to the detected leakage current value, and the mutual inductor station where breakdown occurs will be displayed on the software interface of the industrial control computer.

[0070] The fully automatic high-voltage mutual inductor insulation withstand voltage test device provided by the present invention can not only carry out insulation resistance measurement and power frequency withstand voltage test on high-voltage current mutual inductors and high-voltage voltage mutual inductors in sequence, but also take into account the induced voltage withstand test, error test, and excitation characteristic test of high-voltage voltage mutual inductors.

[0071] If the test object is a high-voltage voltage transformer, after the insulation resistance measurement and the power frequency withstand voltage test are qualified, this experimental device will automatically enter the induction withstand voltage test, error test, and excitation characteristic test processes of the high-voltage voltage transformer.

[0072] Six test objects are integrally translated and conveyed to the voltage transformer error station by the roller conveyor line 7 and positioned below the error connection terminals of the primary side wiring mechanism 3 of the transformer.

[0073] When conducting the induction withstand voltage test, six test high-voltage voltage transformers are simultaneously boosted and verified.

[0074] Start the six groups of primary side wiring mechanisms 3 and secondary side wiring mechanisms 5 of the transformers to conduct primary and secondary wiring of the test object. The A end of the primary terminal of the test voltage transformer is connected to the high-voltage end of the booster through the error contact terminal of the primary side wiring mechanism 3 of the transformer and the current-limiting resistor R2 (for stations 1... 6, corresponding to current-limiting resistors R2, R5, R8, R11, R14, R17 in sequence). The current-limiting resistor R2 is a protection resistor to prevent excessive current from damaging the equipment and flashover phenomena when breakdown occurs during the experiment.

[0075] The induction withstand voltage switching module 67 switches to the voltage monitoring terminal to connect the secondary end of the transformer to the secondary voltage test module. The capacitive voltage divider 84 monitors the primary voltage of the transformer, and the leakage current acquisition module monitors the leakage current of the test object to the ground.

[0076] After the wiring is completed, the industrial control computer sends an instruction to the main control calibrator to connect the 50 kV test transformer 85 to the program-controlled power source 81 through the contactor 69 for triple-frequency boosting operation and boost to the corresponding voltage for the induction withstand voltage test.

[0077] In this way, the induction withstand voltage test and data upload of six test objects are completed. After the experiment, the wiring mechanism automatically resets. When the monitored current of the current transformer is abnormal or the monitored voltage module detects abnormal secondary voltage of the test object, the primary connection and disconnection mechanism disconnects the connection with the corresponding test object and the test stops.

[0078] After the experiment, the wiring mechanism automatically resets.

[0079] When the induction withstand voltage test of the test object is qualified, the software automatically enters the error test process.

[0080] After the test voltage transformer is conveyed by the roller conveyor line 7 and positioned at the verification station, it automatically enters the error test process.

[0081] For the error test, six test objects are simultaneously boosted to the specified points (80%, 100%, 120% of the rated voltage) and verified by switching stations in sequence.

[0082] Start the primary side wiring mechanism 2 of the mutual inductor and the secondary side wiring mechanism 5 of the mutual inductor, and conduct wiring for the primary terminal and secondary terminal of the test object. The A ends of the primary terminals of 6 test voltage mutual inductors are connected in parallel with the high-voltage end of the self-boosting standard voltage mutual inductor 82 through the X contact terminal 36 on the primary side of the mutual inductor.

[0083] After the wiring is completed, the software sets information such as the transformation ratio, accuracy, and secondary load of the test object.

[0084] The industrial control computer sends an instruction to the main control calibrator, and the contactor three 611 of the program-controlled power supply to the self-boosting standard voltage mutual inductor acts, and then controls the program-controlled power supply 81 to output voltage to the input end of the self-boosting standard voltage mutual inductor 82. When the voltage at the high-voltage end of the self-boosting standard voltage mutual inductor 82 rises to 80% of the rated voltage of the test mutual inductor, the voltage is maintained.

[0085] The calibrator controls the error switching control module 61 to connect the secondary wiring terminals of 6 test objects to the test circuit respectively according to the station instruction, and tests and parameters the test data.

[0086] The calibrator analyzes and processes the test data and uploads the data to the industrial control computer.

[0087] The industrial control computer sends an instruction to the main control calibrator, and the contactor three 611 of the program-controlled power supply 81 to the self-boosting standard voltage mutual inductor 82 acts, and then controls the program-controlled power supply 81 to output voltage to the input end of the self-boosting standard voltage mutual inductor 82. When the voltage at the high-voltage end of the self-boosting standard voltage mutual inductor 82 rises to 100% of the rated voltage of the test mutual inductor, the voltage is maintained.

[0088] The calibrator controls the error switching control module 61 to connect the secondary wiring terminals of 6 test objects to the test circuit respectively according to the station instruction, and tests and parameters the test data.

[0089] The calibrator analyzes and processes the test data and uploads the data to the industrial control computer.

[0090] The industrial control computer sends an instruction to the main control calibrator, and the contactor 43 of the program-controlled power supply to the self-boosting standard voltage mutual inductor acts, and then controls the program-controlled power supply 81 to output voltage to the input end of the self-boosting standard voltage mutual inductor 82. When the voltage at the high-voltage end of the self-boosting standard voltage mutual inductor 82 rises to 120% of the rated voltage of the test mutual inductor, the voltage is maintained.

[0091] The calibrator controls the error switching control module 61 to connect the secondary wiring terminals of 6 test objects to the test circuit respectively according to the station instruction, and tests and parameters the test data.

[0092] The calibrator analyzes and processes the test data and uploads the data to the industrial control computer. The test is over.

[0093] After the experiment, the primary side wiring mechanism 2 of the mutual inductor and the secondary side wiring mechanism 5 of the mutual inductor are automatically reset.

[0094] When the error test of the tested voltage mutual inductor is qualified, it automatically enters the excitation characteristic test process.

[0095] Start the secondary side wiring mechanism 5 of the mutual inductor, and the primary terminals of the 6 tested voltage mutual inductors are in an open state.

[0096] After the wiring is completed, the software sets information such as the transformation ratio, accuracy, and secondary load of the tested product.

[0097] The industrial control computer sends instructions to the excitation characteristic tester. Through the internal switching module of the instrument, the secondary wiring terminals of the 6 tested products are respectively connected to the excitation characteristic test state. The excitation characteristic tester applies the rated secondary power frequency voltage to the secondary winding and measures the effective value Ic1 of the excitation current at this time.

[0098] Then raise the voltage applied to the secondary to 2 times (1.5 times for 20 kV) of the rated secondary voltage, and measure the effective value Ic2 of its excitation current again.

[0099] The excitation characteristic tester analyzes and processes the test data and uploads the data to the industrial control computer. If the ratio of the two currents is not greater than 15 (i.e., Ic2 / Ic1 ≤ 15), it can be judged that the excitation characteristic test of the mutual inductor at this station is qualified, otherwise it is unqualified.

[0100] After the experiment, the wiring mechanism is automatically reset.

Claims

1. A fully automatic high-voltage mutual inductor insulation withstand voltage test device, comprising an aluminum profile frame (1), characterized in that: A high-voltage switching pneumatic device (2), a primary side wiring mechanism of a mutual inductor (3), a high-voltage conductive copper busbar (4), a secondary side wiring mechanism of a mutual inductor (5), an electrical measurement function module (6), a roller conveyor line (7), and an electrical measurement instrument (8) are provided on the aluminum profile frame (1); The high-voltage switching pneumatic device (2) is fixedly installed on the inner wall of the aluminum profile frame (1), and the high-voltage switching pneumatic device (2) is located above the electrical measurement instrument (8); The primary side wiring mechanism of the mutual inductor (3) includes a guide rod one (31), a guide rod cylinder one (32), a crimping cylinder (33), an insulator (34), an insulation withstand voltage contact terminal (35), and an error test contact terminal (36). The guide rod one (31) and the guide rod cylinder one (32) are both installed on the crimping cylinder (33). The insulator (34) is installed at the lower end of the crimping cylinder (33). The insulation withstand voltage contact terminal (35) and the error test contact terminal (36) are both installed below the insulator (34); The high-voltage conductive copper busbar (4) is fixedly installed on the inner wall of the aluminum profile frame (1), and the high-voltage conductive copper busbar (4) is located behind the high-voltage switching pneumatic device (2); The secondary side wiring mechanism of the mutual inductor (5) includes a guide rod cylinder two (51), a guide rod two (52), and a secondary side contact terminal of the mutual inductor (53); The guide rod cylinder two (51) is installed on the mounting seat. The telescopic end of the guide rod cylinder two (51) and the guide rod two (52) are both installed on the profile support body. The secondary side contact terminal of the mutual inductor (53) is installed above and below the profile support body; The electrical measurement function module (6) includes an error switching module (61), a power frequency withstand voltage switching module (62), a leakage current acquisition module (63), a power output detection module (64), a module power supply (65), a secondary withstand voltage protection module (66), an induced withstand voltage switching module (67), a secondary voltage test module (68), a contactor one (69), a contactor two (610), a contactor three (611), and a contactor four (612); The electrical measurement instrument (8) includes a programmable power source (81), a self-boosting standard voltage mutual inductor (82), a 5 kV test transformer (83), a capacitive voltage divider (84), and a 50 kV test transformer (85). The contactor one (69) is signal-connected to the 50 kV test transformer (85). The contactor two (610) is signal-connected to the 5 kV test transformer (83). The contactor three (611) is signal-connected to the self-boosting standard voltage mutual inductor (82). The contactor four (612) is signal-connected to the programmable power source (81); The roller conveyor line (7) is fixedly installed on the inner wall of the aluminum profile frame (1), and the roller conveyor line (7) is located below the secondary side wiring mechanism of the mutual inductor (5); The insulation withstand voltage contact terminal (35) and the error test contact terminal (36) have the same structure. The contactor one (69), the contactor two (610), the contactor three (611), and the contactor four (612) are installed in sequence from left to right; The number of the leakage current acquisition modules (63) and the module power supplies (65) is two each; The power frequency withstand voltage switching module (62) is installed above the induction withstand voltage switching module (67).

2. The fully automatic high-voltage mutual inductor insulation withstand voltage test device according to claim 1, wherein: The error switching module (61) is installed above the secondary withstand voltage protection module (66).

3. The fully automatic high-voltage transformer insulation withstand voltage test device according to claim 1, wherein: The capacitive voltage divider (84) is installed above the 50 kV test transformer (85).

4. A fully automatic high-voltage transformer insulation withstand voltage test device according to claim 1, characterized in that: The number of the mounting seats is three, and the number of the second guide rods (52) is two. The two mounting seats are respectively sleeved on the two second guide rods (52).

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