Detailed introduction of the invalid reason of SMC insulation board

There are many reasons for the failure of the SMC insulation board, and one of the more critical factors is caused by aging. If it is kneaded by other objects at high temperature, the insulator may be short-circuited, which will cause the insulation board to fail. Let’s give us a detailed introduction to the reasons for the failure.

(1) Breakdown of gas

When the electric field strength of the SMC insulation board exceeds a certain value, it will cause gap breakdown. If the gap is too small, the electric field strength will increase and cause gas breakdown. Commonly, capacitors break down due to excessively high applied voltage, electric sparks caused by exposed wires, and arcs when the switch is closed. These conditions indicate that they no longer have insulation properties.

(2) Breakdown of liquid dielectric

The electric strength of liquid dielectric is much higher than that of gas under standard state. If the oil contains impurities such as moisture, its electrical strength will be severely reduced, and it is prone to breakdown, leading to failure of the insulating material.

(3) Breakdown along the surface

In the use of SMC insulation board, there are often gas or liquid media around the solid medium, and breakdown often occurs along the interface of the two dielectrics and on the side with lower electrical strength, which is called creeping breakdown. The breakdown voltage along the surface is lower than that of a single dielectric. At the edge of the capacitor electrode, the insulator at the end of the motor wire (rod) is prone to creeping discharge, which causes great damage to the insulation and leads to failure.

The above is an introduction to the reasons for the failure of the SMC insulation board. In the face of different breakdown methods, the results have led to the failure of the insulation board and can no longer exert its due performance. Therefore, we must pay attention to the electrical The control of the equipment prevents unnecessary damage during operation and affects the insulation effect.