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What is the relationship between the pressure corresponding to the rated breaking short-circuit current of VS1 vacuum circuit breaker?

2023-11-18

With the development of social economy, our requirements for electricity are getting higher and higher. However, the requirements for high-voltage breaking short-circuit current are also getting higher and higher. So what is the rated breaking short-circuit current pressure? This pressure is actually what we refer to. What is the working pressure corresponding to the rated breaking short-circuit current corresponding to the working pressure of the contacts in the vacuum arc extinguishing chamber of the vacuum circuit breaker? (This pressure is related to our insulating tie rods)

Rated contact working pressure in vs1 vacuum circuit breaker:

The rated contact working pressure of the vs1 vacuum circuit breaker is equal to the sum of the self-closing force of the vacuum extinguishing chamber and the closing spring force. The appropriate selection of the contact working pressure of vs1 vacuum circuit breaker can keep the contact resistance of the vacuum arc extinguishing chamber within the specified range. Within a certain contact pressure range, the greater the pressure, the smaller the contact resistance, and the smaller the contact resistance, the smaller the contact resistance. The resistance can reduce the heat generated by the switch during long-term operation and ensure the safe operation of the switch. At the same time, sufficient contact working pressure can meet the requirements of dynamic stability test, withstand large electric force, and can also suppress closing bounce and reduce opening bounce. Because when the vs1 vacuum circuit breaker closes the short-circuit current, the contacts will generate arc and electric repulsion after pre-breakdown, the contacts will bounce, and the closing speed of the mechanism is the slowest. Therefore, closing the short-circuit current is the assessment of the contact work. Whether the pressure meets the most demanding conditions required.

If the working pressure of the contacts is too small, the bounce time when the contacts are closed will be increased. At the same time, the resistance of the primary circuit will be increased, which will directly affect the long-term operating temperature rise of the vs1 vacuum circuit breaker. If the working pressure of the contact is too large, since the self-closing force of the vacuum interrupter is a constant value, the working pressure will increase, thereby increasing the spring force of the contact, causing the closing work of the operating mechanism to increase, and increasing the pressure on the vacuum. The impact and vibration of the arc extinguishing chamber will cause air leakage in the vacuum arc extinguishing chamber in the long run. The contact working pressure of vs1 vacuum circuit breaker is based on the rated short-circuit breaking current. The empirical data are shown in Table.