Operating mechanism for circuit breaker and circuit breaker using the operating mechanism

Abstract

The invention relates to an operating mechanism for a circuit breaker and a circuit breaker using the operating mechanism. The operating mechanism for a circuit breaker includes left, middle and right brake lever transmission structures respectively used for transmission connection with corresponding phase opening and closing levers. The transmission structures of the two adjacent brake rods are connected by interphase connecting rods. At least one drive motor is arranged on the left and right sides of the middle brake rod transmission structure. The transmission structure of the brake lever is connected by transmission. The invention provides an operating mechanism for a circuit breaker that can reduce the purchase cost of a driving motor and simultaneously improve the synchronism between the transmission structures of the brake rods of each phase.

Description

technical field [0001] The invention relates to the field of circuit breakers, in particular to an operating mechanism for a circuit breaker and a circuit breaker using the 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 reliabi...

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 for the transmission shaft and the connecting rod between each phase. For example, each phase The torque transmitted by the brake rod transmission structure required for the opening and closing of the contact assembly is 1M, then the output power of the drive motor should be at least 3M, and the maximum torque that the drive shaft connected to the drive motor must bear is at least 3M. 1. The maximum torque required to be borne by the interphase connecting rod between the two 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. The strength requirements of each connecting rod are relatively high. The connecting rods need to have a larger structural size, which not only increases the production cost of each connecting rod, but also increases the mass of the transmission system, which increases the energy consumption of the drive motor and the required output of the drive motor. more torque

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