Positioning assembly device for circuit breaker operating mechanism and its displacement sensor

Abstract

The invention relates to a circuit breaker operating mechanism and a displacement sensor positioning and assembling device thereof, comprising an operating mechanism casing and a transmission shaft, a displacement sensor is set on the transmission shaft, and a displacement sensor positioning and assembling device for the circuit breaker operating mechanism, the positioning and assembling device It includes a connection part that is fixedly connected with the casing of the operating mechanism, and a guide rod that is fixedly connected with the displacement sensor. The coincident linear guiding directions guide the guide hole for the guide rod, and the guide hole has a hole wall for slidingly fitting with the guide rod to limit the axial and circumferential directions of the displacement sensor. The invention guides and slides along the guide hole through the guide rod, so that the radial force generated by the transmission shaft on the displacement sensor is reduced, the stress of the displacement sensor is reduced, the displacement sensor maintains better stability, the service life of the displacement sensor is extended, and the displacement sensor is improved. The reliability of the displacement sensor.

Description

technical field [0001] The invention relates to an operating mechanism of a circuit breaker, in particular to a positioning and assembling device for the operating mechanism of a circuit breaker and a displacement sensor thereof. Background technique [0002] Intelligent high-voltage switchgear has been widely used in newly-built substations. Displacement sensors are used in intelligent high-voltage switches to measure the stroke, speed, time and other parameters of circuit breaker operating mechanisms. Therefore, displacement sensors are important components for monitoring the mechanical properties of circuit breakers. Its measurement structure directly affects the judgment of the performance of the circuit breaker by the control background of the smart substation, which is related to an important aspect of the normal operation of the smart grid, so that the reliability and service life of the displacement sensor are getting more and more attention. [0003] The displacemen...

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Problems solved by technology

[0003] The displacement sensor mainly uses a through-hole photoelectric encoder. When in use, the displacement sensor is directly set on the transmission shaft of the circuit breaker operating mechanism. The sensor performs axial limit and circumferential limit. This connection method will cause the transmission shaft and the axis of the displacement sensor to be out of axis due to the connection force, so that the drive shaft will generate a radial force on the displacement sensor. The radial force will Make the displacement sensor swing radially during the working process, and the casing of the displacement sensor is fixed with the connecting plate and the casing of the operating mechanism, so the force of the displacement sensor swinging radially cannot be eliminated, and long-term use may cause damage to the displacement sensor. It affects the measurement stability and service life of the displacement sensor; at the same time, due to the strong electromagnetic interference in the environment where the intelligent high-voltage switch is used, especially when the circuit breaker is in the process of opening and closing, it will instantly generate a strong voltage on the switchgear shell. The displacement sensor is directly set on the transmission shaft and the casing is connected to the casing of the operating mechanism through the connecting plate, so the voltage on the switchgear will cause certain interference to the displacement sensor, and the displacement sensor may be broken down and damaged in severe cases. Using this installation and fixing method makes the measurement stability of the displacement sensor poor, the reliability is low, and the service life is short

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