Circuit Breaker Opening and Closing Speed ​​Accurate Measurement System

Abstract

The invention relates to a circuit breaker switching on and off speed precise measurement system, which comprises a measurement and control host, a data acquisition device and a voltage regulator, wherein the measurement and control host is connected with the data acquisition device via a network interface to transmit measurement and control orders and data, the data acquisition device is connected with a transformer to be measured through a coaxial cable to be used for acquiring temperature and current signals of the transformer to be measured, the data acquisition device is also connected with an input control end of the voltage regulator to be used for controlling voltage at a voltage end, and an output end of the voltage regulator is connected with a three-phase input end of the transformer to be measured. The system disclosed by the invention has a reasonable design, standard capacitors are connected outside movable and fixed contacts of a circuit breaker to be measured and the waveform changes of the standard capacitors in the switching on and off processes are measured to obtain the stroke of the movable contact in each time period, so the action speed of the circuit breaker in a certain time interval is accurately measured, and the system can be widely used for accurately measuring the circuit breaker switching on and off speed in an electrical power system.

Description

technical field

[0001] The invention belongs to the field of high-voltage circuit breakers, in particular to an accurate measurement system for the opening and closing speed of a circuit breaker. Background technique

[0002] In the power system, the opening speed and closing speed of the high-voltage circuit breaker are one of the important technical data to measure the working condition and performance of the circuit breaker. Since the moving and static contacts of the circuit breaker are sealed in the arc extinguishing chamber, the existing instruments used to measure the speed of the circuit breaker usually measure the speed of the moving contact indirectly by measuring the speed of the operating mechanism connected to the moving contact. The problem with the above method is that due to the coordination error in the connection between the various parts of the operating mechanism, there is an error between the measured result and the actual speed, and it is difficult to m...

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