Circuit breaker and operation mechanism thereof

Abstract

The invention relates to a circuit breaker and an operation mechanism of the circuit breaker. The operation mechanism of the circuit breaker comprises a left switching rod transmission structure, a middle switching rod transmission structure and a right switching rod transmission structure, wherein the switching rod transmission structures are connected with corresponding switching-on and switching-off rods of all phases respectively in a transmission mode. Every two adjacent switching rod transmission structures are connected through an interphase connecting rod. The left side and the right side of the middle switching rod transmission structure are respectively provided with at least one drive motor. The power output end of each drive motor is connected with the corresponding interphase connecting rod or the corresponding switching rod transmission structure in a transmission mode through a corresponding motor transmission structure. By the adoption of the operation mechanism of the circuit breaker, the purchase cost of the drive motors can be reduced, and the synchronism between the switching rod transmission structures of all the phases is improved.

Description

technical field [0001] The invention relates to the field of circuit breakers, in particular to a circuit breaker and its operating mechanism. Background technique [0002] High-voltage circuit breaker is the most important switchgear in the power system. It is responsible for the dual tasks of controlling and protecting the circuit. Its performance is one of the important factors that determine whether the power system can operate safely. All the functions of the high-voltage circuit breaker are reflected in the opening and closing actions of the dynamic and static contacts. The opening and closing actions of the dynamic and static contacts are realized through the operating mechanism, which is an important part of the circuit breaker. It is a key component that determines the performance of the circuit breaker. Its performance directly affects the technical performance of the circuit breaker. Therefore, the working reliability of the circuit breaker depends to a large exte...

AI Technical Summary

Problems solved by technology

The existing problems of this operating mechanism are as follows: 1. The output torque of the drive motor cannot adapt to the three-phase circuit breaker with a voltage level above 126Kv. This is because of the particularity of the drive motor it uses. The higher the output torque of the drive motor is, the greater the output torque of the drive motor is, and the opening and closing speed of the circuit breaker also needs to be increased accordingly, and the speed of the drive motor is correspondingly faster, which will cause a sharp increase in the manufacturing cost of the drive motor; 2. The distance between the driving motor and the transmission structure of the brake rod of each phase is different. The farther the phase is from the driving motor, the worse the synchronization is, especially in the open circuit breaker, there is a clear safety distance requirement between phases. The longer the transmission stroke, the greater the cumulative deformation, which makes this shortcoming more obvious; 3. The drive motor is set at one end of the entire operating mechanism, resulting in a larger maximum torque to be borne by the motor connecting rod and the connecting rods between phases. The torque transmitted by the brake rod transmission structure required for the phase contact assembly to open and close is 1M, then the output power of the driving motor should be at least 3M, and the maximum torque that the motor connecting rod connected to the driving motor must bear is at least 3M. The maximum torque required by the interphase connecting rod between the first and second phases is at least 2M, and the maximum torque required by the interphase connecting rod between the second and third phases is at least 1M, and the strength requirements of each connecting rod are relatively high , each connecting rod needs to have a larger structural size, which not only increases the production cost of each connecting rod, but also increases the quality of the transmission system with a larger connecting rod, which increases the energy consumption of the drive motor. output torque is greater

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