[Dali Transformer] Commonly used detection methods for transformer faults

It is very difficult to obtain the characteristics of common faults and the location of common faults in order to fully consider that the transformer structure has a certain diversity, and there are various ways of common faults.

1. Transformer insulation resistor test

In the insulation resistor test, according to some inspections, it is possible to have a clearer grasp of the centralized defects of the overall moisture return of the transformer insulation, the moisture return of the component surface, the stain and its penetration.

2. Transformer leakage current test

In the leakage current test, because of its high sensitivity, it is possible to immediately distinguish the tightness of the waterproof casing of the transformer and the condition of the crack of the waterproof casing with high pressure, and discover the defects that cannot be detected by the test.

3. Transformer AC withstand voltage test

The AC withstand voltage test can detect some defects of the main insulation of the transformer, such as moisture return, cracking or loose winding of the winding main insulation, and dirt adhered to the winding insulation.

4. Transformer resistance measurement test

The resistance measurement test can check whether the tap power switch and the wire are in good contact with the waterproof casing, whether the connector is loose, whether the winding is broken, whether the locked rotor has short-circuit faults, etc. Phase winding resistance measurement is not a reasonable way to equalize.

5. Transformer full load test

The full load test can find that the transformer core has a little more grounding device, the overall embrittlement of the transformer core ferrite core and other partial insulation defects or overall shortcomings. , Distinguish whether the winding has thermal breakdown between turns, etc.