The high-voltage test transformer is suitable for the power system to conduct the insulation strength test of various high-voltage electrical equipment and insulating materials under the power frequency or DC high voltage. The high-voltage test transformer has a capacity of 3kVA～300kVA, which can be customized according to customer needs.

An oil-immersed transformer is a static electrical device that exchanges and transforms voltage. It uses the principle of electromagnetic induction to transform a voltage of a certain frequency into another or multiple voltage power devices of the same frequency with indefinite values. In order to ensure the reliable operation of oil-immersed transformers, on the one hand, effective preventive measures are taken to eliminate hidden dangers; on the other hand, for abnormally operating transformers, the causes are analyzed based on abnormal phenomena. Current oil-immersed transformer faults are generally divided into internal and external faults.

Faults in the transformer tank, such as time short circuits between windings of different phases, inter-turn short circuits between windings, and ground faults caused by windings or lead wires passing through the casing. In terms of nature, internal faults can be divided into thermal faults and electrical faults.

The external fault of the transformer oil tank is the fault of the insulating tube and the lead wire, such as the ground short circuit caused by the flashover or rupture of the insulating tube, and the relevant internal fault of the transformer caused by the fault between the lead wires.