Introduction: ZYD series vacuum insulating oil purifier is mainly used to extend the lifetime of oils used in transformers, circuit breakers, mutual inductor, voltage regulators and switch gear, or to inject the insulating oil into the transformers. Equipped with regenerators, ASSEN transformer oil purification equipments can improve the effect of de-acid, de-color and remove dielectric and acid more effectively. The value of breakdown voltage will increase from 15KV to 75KV.