Installation steps of outdoor column vacuum circuit breaker

1. Check before installation

In order to ensure the safe and reliable operation of the circuit breaker, it must be inspected before entering the installation. First, after the packaging is removed, first check the appearance of the circuit breaker, such as whether the insulating protective layer on the conductive rod is in good condition, whether there are cracks and other defects, how the surface of the casing is, whether there is any damage caused by transportation, whether the number of the nameplate is consistent with the order requirements, etc. Secondly, check whether the random accessories, spare parts and documents are complete. After that, perform manual trial operation for 5 to 10 times to check the action performance of the circuit breaker operating mechanism. Finally, the 42kV/min power frequency withstand voltage test is carried out between the same-pole fractures of the main circuit of the circuit breaker, the phase-to-phase and phase-to-ground and the control part.

2. Installation

First, make a fixing bracket according to the installation size of the circuit breaker and power engineering requirements, and firmly fix the circuit breaker on the bracket. Secondly, the bolts connecting the wire terminals and the circuit breaker inlet and outlet terminals should be tightened to ensure good contact. Finally, the control circuit is connected correctly according to the circuit diagram.

Extended information

The vacuum circuit breaker is named because the arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are high vacuum; it has the advantages of small size, light weight, suitable for frequent operation, and no need for maintenance for arc extinguishing. The application is more popular. The vacuum circuit breaker is an indoor power distribution device in a 3-10kV, 50Hz three-phase AC system. It can be used for protection and control of electrical equipment in industrial and mining enterprises, power plants and substations. In the places of maintenance and frequent operation, the circuit breaker can be configured in the middle cabinet, double-layer cabinet and fixed cabinet to control and protect high-voltage electrical equipment.

Working principle: The working principle of the vacuum circuit breaker is: when the moving and static contacts are opened under the action of the operating mechanism, an arc is generated between the contacts, and the surface of the contacts evaporates steam at high temperature. Because the contacts are designed with a special shape , When the current passes through, a magnetic field is generated, and the arc moves rapidly along the tangential direction of the contact surface under the action of this magnetic field, and part of the metal vapor condenses on the metal cylinder (shield), and the arc is extinguished when it naturally crosses zero. The strength of the medium between the heads quickly recovered.