Parts that are prone to problems in high voltage switchgear

The failure of the high-voltage switchgear is usually due to one or more of the components. The following are the components that are more prone to problems:

1. Voltage transformer:

A voltage transformer failure usually results in a blown primary side fuse. The inter-turn, inter-layer, inter-phase, and one-phase grounding in the voltage transformer may cause the primary side fuse to blow. When the secondary side of the voltage transformer is faulty, if the secondary side fuse is selected too large, it will easily cause the primary side fuse to burn out. One phase of the 10kv power supply is grounded, and the ground voltage of the other two phases will increase to three times the root, which will cause the current to increase and the fuse will also be burned.

2. Lightning arrester:

As the main components of the protection switchgear, the arrester should be overhauled regularly. Usually, the arrester fails with magnetic insulation damage or direct explosion. Once the arrester fails, it should be replaced in time.

3. Cable:

Cable faults are generally phase-to-phase short-circuits. Even single-phase short-circuits will slowly evolve into two-phase or three-phase short-circuits due to the long discharge time. At this time, it is necessary to troubleshoot the point of failure, and power on only when the failure is handled, otherwise more equipment will be burned out.

4. Current transformer:

The fault of the current transformer is usually the overheating of the iron core, and it is easy to explode the transformer in severe cases. If the current transformer is running due to overload, secondary open circuit or insulation damage, it will cause abnormal sound. At this time, it is necessary to analyze the cause and take corresponding measures to solve the fault.