What is the Insulation accident under the overvoltage of the transformer?

Transformer undertakes the important task of voltage transformation and energy transmission in the power system. However, under the condition of overvoltage, the transformer may encounter various insulation accidents, which will seriously threaten its safe operation. The following are the main types of insulation accidents:

Content

●Wrap insulation breakdown

Under the action of overvoltage, the main insulation and turn insulation of the transformer winding may be seriously tested. The high voltage may lead to the instantaneous breakdown of the insulation layer, forming a short circuit channel inside the winding, and then causing the winding burning accident.

●The sleeve flash

As the connecting part of the transformer and the external circuit, the insulation performance of the casing is crucial. Under overvoltage conditions, the insulation outside the casing may be discharged along the surface or air gap breakdown, leading to flashover accident and affecting the normal operation of the transformer. 

●Splter switch arc discharge

The tap switch plays a key role in regulating the transformer output voltage. However, the overvoltage may cause the arc discharge inside the tap switch, leading to the contact ablation, oil quality deterioration, and even cause the switch explosion and other serious consequences.

●The iron heart discharges to the ground

Core is the core component of transformer, and its insulation performance is crucial to the overall safety of transformer. In the case of overvoltage, the insulation between the core and the ground may be damaged, and the ground discharge phenomenon occurs, and then cause the core overheating, damage and other accidents.

In Summary

To sum up, the transformer may face various insulation accidents such as winding insulation breakdown, casing flashover, tap switch arc discharge and core discharge under overvoltage. In order to ensure the safe and reliable operation of the transformer, effective overvoltage protection measures should be taken, and regular insulation performance detection and maintenance.

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LuShan, est.1975, is a Chinese professional manufacturer specializing in power transformers and reactors for 49 years. Leading products are single-phase transformer, three-phase isolation transformers,electrical transformer,distribution transformer, step down and step up transformer, low voltage transformer, high voltage transformer, control transformer, toroidal transformer, R-core transformer;DC inductors, AC reactors, filtering reactor, line and load reactor, chokes, filtering reactor, and intermediate,high-frequency products.

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