In the field of power testing, in order to inspect the installation quality of tap changers, accurately determine the quasi-action characteristics of the on-load tap changer of the transformer, reduce the accident of the transformer tap changer, and eliminate the misjudgment of the non-defective tap changer due to the unsuitability of the test technology, the scientific research department Invest in a certain amount of effort to develop the transformer on-load tap changer action characteristics with winding AC test technology. The clamp ground resistance tester can measure ground faults that cannot be measured by traditional methods, because the meter measures the resistance of the grounding body and the grounding lead resistance. Comprehensive value.

1. With winding AC test tap changer action characteristics, it has the following advantages: Simulating the running state test of the transformer, it can reliably find the defects in the tap changer action process.

The transformer on-load switch tester can test the tap changer of transformers with different connections of the voltage regulating winding, filling the blank area of the transformer on-load tap changer test.

The AC test connection method is flexible and diverse. When the test tap changer exchange program is abnormal, any voltage and current can be used for testing, and the defect nature can be confirmed and tested without misjudgment.

Exclude the interruption caused by the current non-defective reason in the tap switch DC test, distinguish the current jump formed by the transition resistance and the poor contact of the switch contact lead, and directly reflect the technical characteristics of the tap switch action process. During the switching process of the tap changer, although the moving and static contacts move at a high speed, the contact is good, especially under high voltage, the tap changer test waveform variation shown in some low-voltage DC tests is not a switch defect.

The AC test of the transformer on-load switch tester can not only accurately determine the tap changer exchange procedure, but also make a judgment on the contact condition of each contact during the tap changer switching process.

The waveform analysis conclusions obtained by the AC test of the tap changer can be used as the final test of the action characteristics of the tap changer, which is recognized by the engineering and technology circles of various countries.