A switching speed measurement system for circuit breakers based on a linear array camera

Abstract

The present switching speed measurement devices for circuit breakers are mostly low in accuracy， severe on installation conditions， and cannot achieve real-time online monitoring. A new system for real-time switching speed measurement of circuit breakers based on a line array camera is proposed. First， the experimental technique is studied by building an experimental frame simulating the rotation of circuit breakers. A turntable is installed at the output of the motor to simulate the rotating shaft of the circuit breaker actuator， and a line array camera is placed on the turntable side to capture the black and white narrow strip images of the targets set on the turntable. Afterward， the appropriate resolution， exposure time and judgment threshold are chosen to analyze the changes of the images taken by the line array camera in real time to obtain the real-time motion travel of the target and the rotation speed of the turntable. The switching speed of the circuit breaker is obtained to verify the feasibility of the measurement scheme. Finally， it is applied to a pilot substation to monitor the motion travel of the switching of the circuit breaker in real time. Compared with the existing technology， this measurement system can process the images more quickly and measure the switching speed more precisely and stably.

Keywords

• circuit breaker
• switching speed
• linear array camera
• rotating shaft
• target