Alternating-current and direct-current comprehensive test method of on-load tap changer of large transformer
An on-load tap-changer and comprehensive testing technology, applied in circuit breaker testing and other directions, can solve the problems of inability to accurately judge on-load tap-changer, waveform jitter, breakpoint, etc., so as to avoid being misled by interference signals and make effective judgments. Effect
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Embodiment 1
[0070] In this embodiment, a 110kV substation No. 2 main transformer, model SZ11-50000 / 110, and a tap changer MAE10193 are tested by the direct current method and the alternating current method respectively in the actual case of the switching process to illustrate the application effect of the present invention.
[0071] First, the preliminary judgment of the state of the on-load tap-changer: the switching process of the on-load tap-changer is tested by the DC method, and the test results are as follows: Figure 4 shown. The test waveform of the DC method has no obvious change before and after the maintenance of the tap changer. The switching time, transition time and transition resistance of the tap changer are normal, and there is no difference between the test DC waveforms of 1A and 3A.
[0072] Final confirmation of the status of the on-load tap-changer: conduct an AC test on the switching process of the transformer on-load tap-changer, and the test results are as follows:...
Embodiment 2
[0076] In this embodiment, the No. 1 main transformer of a 110kV substation, the model is SZ11-50000 / 110, and the tap changer MAE10193 is tested by the DC method and the AC method respectively in the actual case of the switching process to illustrate the application effect of the present invention.
[0077] First, the preliminary judgment of the state of the on-load tap-changer: the switching process of the on-load tap-changer is tested by the DC method, and the test results are as follows: Figure 7 shown. It was found that the A-phase curve of the tap changer had a large downward oscillation at the end of the switching, which was probably caused by insufficient contact pressing force after the switch was switched;
[0078] Determine the state of the tap changer again: 3A DC method test is carried out on the switching process of the on-load tap changer, and it is found that there is no obvious difference between the test DC waveforms of 1A and 3A, and the same problem occurs ...
Embodiment 3
[0083]This example illustrates that the 3A direct current method is also indispensable for testing on-load tap-changers. First of all, make a preliminary judgment on the on-load tap-changer: use the 1A DC method to test the switching process of the on-load tap-changer from 2 to 1. The test waveform shows that the first transition resistance cuts in and bridges There is no problem in the time, but when the second transition resistor is cut off, the three-phase waveforms of A, B, and C all have serious bounce pull-down gullies, such as Figure 9 shown. This test result cannot determine whether it is a problem with the detection method or a real problem with the tap changer. Further test checks are required on the on-load tap-changer.
[0084] Determine the status of the tap changer again: increase the DC power supply to 3A, and the waveform of the test result returns to normal. When the second transition resistor is cut off, the pull-down gully of the three-phase waveforms of ...
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