Z Connection Station Transformer Ought to Reinforce Longitudinal Insulation Detecting
Based on analyzing the occurrence of several electrical equipment accidents and structural characters of Z connection wiring transformers and cast resin transformers,pointed out that the dry-type transformers due to poor manufacturing processes may result in running partial discharge,further due to poor heat dissipation and other reasons,causing insulation cracking,leading to inter turn short circuit.A routine test,basically to test transformer insulation strength by imposing AC withstand voltage can not detect longitudinal insulation damage.By induced over voltage withstand test,partial discharge test,dry-type transformer insulation hidden damage can be detected.