A method for measuring the opening and closing speed characteristics of high-voltage circuit breakers based on machine vision

Abstract

The present invention provides a high voltage circuit breaker switch-on and switch-off speed characteristic measurement method based on machine vision. While the motion of a high voltage circuit breaker is recorded, a high speed camera is used to shoot the color mark of the surface of an observed moving part, a recorded video image is processed and identified through a machine vision algorithm, the position coordinate of the observed object of each frame of image of a video relative to a reference point is determined, the movement track of the observed object is obtained, and thus the switch-on and switch-off speeds of a high voltage circuit breaker moving contact are calculated. The installation of a sensor in a mechanical mode is not needed, only the setting of a color reference mark at an observation point is needed, a sensor is not need to replace for different measurement objects, and only the change of the position of a reference mark is needed. In addition, the linear motion or rotation speed can be measured, the field application is facilitated, the influence of an environmental condition of the equipment is small, and the need of online measurement of power switch equipment such as a high voltage circuit breaker in a live operation can be satisfied.

Description

[0001] 【Technical field】 [0002] The invention belongs to the field of state monitoring of electric power equipment, in particular to a method for measuring the opening and closing speed characteristics of a high-voltage circuit breaker based on machine vision. [0003] 【Background technique】 [0004] In the power system, the high-voltage circuit breaker is a widely used electrical equipment. Its opening and closing speed directly affects the breaking and closing performance of the circuit breaker. Only by ensuring the appropriate opening and closing speed can it be fully utilized. Its ability to break current: Excessive opening and closing speeds will cause the operating mechanism of the high-voltage circuit breaker to withstand excessive mechanical stress and impact, causing mechanical damage to structural components, reducing its service life, and prolonging the contacts at the same time The closing bounce time; and too low opening and closing speed will affect the arcing e...

AI Technical Summary

Problems solved by technology

[0007] (1) The sensor is required to be connected and fixed to the moving parts of the high-voltage circuit breaker, and additional fixed parts need to be installed. The fixed parts themselves have a certain impact on the structure of the high-voltage circuit breaker, which leads to certain changes in the opening and closing speeds of the high-voltage circuit breaker. Change;

[0008] (2) After the sensor is fixed, its fixed part and movable end may cause the movement of the circuit breaker to jam, so that the measured speed is not accurate enough;

[0009] (3) When the displacement sensor is used, since the high-voltage circuit breaker connecting rod is used to drive the sensor to measure, it is required that the guide head of the linear displacement sensor is rigidly connected with the high-voltage circuit breaker contact connecting rod, and the trajectory of the two must be completely parallel , so a slight inclination during actual installation will cause measurement errors;

[0010] (4) If the fixed point of the displacement sensor is not firm, when the high-voltage circuit breaker operates, the sensor body that should be fixed will undergo a small amount of displacement, resulting in measurement errors;

[0011] (5) Regardless of whether grating sensors, rotary encoders or displacement sensors are used, the sensor installation, data recording, and data processing processes in the measurement process are all completed by the experimenters. Due to the influence of various factors, there are certain human errors, and It is especially time consuming when carrying out a large number of measurements;

[0012] (6) Since the external structure needs to be installed, none of the above methods can be used for online measurement, so as not to affect the normal operation of the high-voltage circuit breaker

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