An insulating pull rod for a circuit breaker

Abstract

The invention discloses an insulated pull rod of a circuit breaker, belonging to the technical field of circuit breakers.The insulated pull rod of a circuit breaker comprises an insulating rod, a sliding block connected with a moving contact of the circuit breaker, and a guiding rod connected with the insulating rod. The insulating rod is provided with a chute, the sliding block is slidingly installed in the chute, a damping piece is installed between the sliding block and the chute, the top end of the insulating rod is provided with a limit ring, a flexible piece is connected between the sliding block and the moving contact, one end of the flexible piece is in threaded connection with the sliding block, the other end of the flexible piece is in threaded connection with the moving contact,and the flexible piece is located at the outer side of the limit ring. The objective of the invention is to provide an insulated pull rod of a circuit breaker. The insulating rod is provided with theflexible piece having a buffer function, and the flexible piece is high in tensile strength and high in the mechanical strength and has a good buffer function to reduce the instantaneous load of theinsulating pull rod when closed and prolong the service life of the insulating pull rod.

Description

technical field [0001] The invention relates to the technical field of circuit breakers, in particular to an insulating pull rod of a circuit breaker. Background technique [0002] With the continuous development of the national economy, the grid structure and load characteristics are becoming increasingly complex. The continuous development and improvement of my country's electric power industry has put forward strict requirements for power quality and operational reliability. In the current high-voltage power grid, the demand for standardization and simplification is becoming more and more obvious, which will help improve reliability and reduce installation and operation costs. As an indispensable main control and protection equipment in the power system, the circuit breaker has high reliability, large breaking capacity, long maintenance cycle, and is suitable for frequent operation. It has been used in various fields such as the power industry, industrial and mining ente...

AI Technical Summary

Problems solved by technology

Generally, increasing the mechanical strength will inevitably increase the size of the machine, which will cause a series of parts to increase in size, resulting in waste of materials, increasing product costs, and still not meeting the trend of miniaturization of high-voltage electrical products. Therefore, the urgent problem to be solved at present is, Meet the mechanical strength of circuit breaker insulating rod products without increasing the mechanical size

[0004] During the closing process, there will also be a phenomenon of closing bounce. The cyclic opening / closing phenomenon between the dynamic and static contacts in the circuit breaker will generate a higher voltage, which will cause damage to the circuit breaker and even the entire power supply system. Serious impact, and in the process of repeated opening and closing of the contacts, it is very easy to cause welding of the contacts, which will also cause harm to the entire system. Continuous impact on the contacts will deform the contacts and cause damage to the vacuum bubbles. Mechanical damage, seriously affecting its insulating properties

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