The role and structure of high-voltage isolating switch

The role and structure of high-voltage isolating switch

Through investigation and research, it was found that in the past, copper was often used to make touch fingers. In order to ensure the strength and rigidity of the touch fingers, it is necessary to make the touch copper plates with a large thickness, so that the copper material is wasted;

The contact pressure between the contact finger and the contact of the traditional contact finger is provided by the spring, then the complexity of the cooperation structure of the contact finger and the contact is greatly increased; In addition, the contact finger does not have a good self-cleaning ability, After long-term use, the elasticity of the spring will slowly decline, reducing the contact pressure and increasing the contact resistance, resulting in a series of failures.

The self-operated contact fingers are provided by their own rigidity in terms of contact pressure. This contact finger can reduce the thickness of the part and save copper. At the same time, the matching structure of the contact finger and the contact is also simplified, and it has strong self-cleaning. With its ability and relatively stable contact pressure, failures that are prone to occur with traditional fingers can also be avoided.

In high-voltage lines, it is necessary to use isolating switches and short-circuiters together. The circuit breaker has an arc extinguishing function. Therefore, the load current and fault current are mainly opened and closed in the circuit, and the isolating switch is exposed in the atmosphere. Isolate the circuit.

If a fault occurs in the circuit and needs to be repaired, the circuit breaker needs to be opened first, and then the disconnect switch is disconnected. After the circuit maintenance work is completed, the disconnect switch needs to be closed first, and then the circuit breaker is turned on.

Compared with circuit breakers, high-voltage disconnectors have a simpler structure and a wider variety, and have a variety of structural forms; but no matter which form, they can be divided into five components, which are breaking components , Support (insulation) element, transmission element, operating element and base.

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