Preventive measures for high voltage switchgear failure

1. Failure caused by switchgear manufacturing process and its treatment:

The production of switchgear is based on the manufacturing process of the cabinet. When manufacturing switchgear, first choose angle steel, channel steel and other profiles. According to the requirements of the cabinet structure, qualitative plate members, special steel pipes are welded, and the variation and need to be adjusted are connected with fasteners. In order to prevent the unsightly problems caused by mutual extrusion of the joints of the cabinet structure due to thermal expansion of welding. Preventive measures include: correcting after welding; predict the deformation range in advance, and face the opposite direction of deformation when welding; if necessary, heat treatment of the structure as a whole; in order to make the convex part after welding the same degree of shrinkage as the weld, it is necessary Heat the raised part.

2. Pay attention to the choice of materials:

In the design of the power system, it is necessary to fully analyze the factors that can lead to the failure of the switchgear, so as to take scientific and effective preventive measures during the design. At present, there are many types of electrical components sold on the market, and the quality is uneven, which requires the staff to design, need to analyze the performance and applicable environment of different electrical components, select high-quality materials, and ensure that the switchgear is in the best position. Good condition. In addition, some high-performance materials can also be selected in the design, which has a better effect on improving the safety factor of the equipment.

3. Pay attention to the design of creepage ratio:

In the process of switchgear design, the creepage distance is a very important parameter. Only by meeting the requirements of this indicator can the entire power supply system work stably and safely. For the creepage distance, the country has clear regulations, the outer edge creepage distance of each component in the high-voltage switchgear is not less than 18mm/kV, and the organic insulation is not less than 20mm/kV. In order to meet this standard, the power construction department should strictly control the specifications of related accessories, and if necessary, they can find relevant manufacturers to make customized products to ensure the reliability and stability of the power system.

4. Vacuum circuit breaker failure and treatment:

The vacuum circuit breaker diagram is named after the arc extinguishing medium and the insulating medium in the contact gap after the arc extinguishing are both high vacuum. Its main components are the vacuum interrupter and the operating mechanism. The fault types of vacuum circuit breakers mainly include chronic air leakage in the arc extinguishing chamber, which causes the circuit breaker to fail to open normally. Therefore, it is necessary to increase the vacuum in the vacuum arc extinguishing chamber; the long-term breakdown of the vacuum circuit breaker. The operation of the gate will cause the moving parts of the mechanism to loosen or fall off, thereby reducing the speed of the gate and gate, and cause problems such as jamming of the gate of the gate solenoid in the control loop.

5. Pay attention to safety design:

Safety is the primary consideration for any project. The same is true in the power industry. Safe use of electricity is an important prerequisite for the long-term development of the power industry. In order to ensure the safe operation of the power supply system, the power industry has formulated relevant standards. For example, the air gap between the phase conductors in the high-voltage switchgear and the ground must be above 125mm. When using load-insulating structures, attention should also be paid to the coordination of the dielectric constants of different insulating materials. Only in this way can the occurrence of accidents and the corrosion of the busbar by smoke or harmful bodies be effectively avoided.

6. In terms of performance:

When designing the protection structure of the power system, it is not only necessary to install in strict accordance with the standard, but also to continuously improve the operation mode of the relay protection to make it have better performance and better ensure the safe operation of the power system. . And when the relay is replaced, some important parameters need to be redesigned.