How To Measure Core Insulation In Dry-type Transformer?

The iron yoke of the transformer is connected with an iron core ground lug and the clamp, and the bolt is unscrewed and measured with a 2500V swing meter; The E pole of the table is connected to the core, and the other end is connected to the clamp; No less than 20M is enough. Dry transformers are widely used in local lighting, high-rise buildings, airports, terminals, CNC machinery and equipment and other places, a simple dry transformer refers to the iron core and winding is not impregnated in insulation oil transformer. Cooling methods are divided into natural air cooling (AN) and forced air cooling (AF). When naturally air-cooled, the transformer can operate continuously for a long time at additional capacity. When forced air cooling, the output capacity of the transformer can be increased by 50%. Suitable for intermittent overload operation, or emergency overload operation; Due to the large increase in load loss and impedance voltage during overload, it is in a non-economic operation condition, so it should not be kept in a long time continuous overload operation.