针对国家电网系统在防污闪工作中, 无法在线测量电气设备爬电距离的现状, 基于双目立体视觉研制了一种高压绝缘子爬电距离的带电检测系统。提出了利用圆锥面离轴反射镜产生线结构光的方法。利用窄带滤光片增强了线结构光在图像中的对比度, 并结合最大类间方差法和灰度重心法对图像进行自适应阈值分割, 实现了特征点的自动提取, 解决了强太阳光和复杂背景对特征点提取的干扰问题。通过系统标定后, 对高压绝缘子样品的爬电距离进行了精度测试, 实验结果表明最大相对误差为1.45%, 平均相对误差为0.69%, 已成功应用于110 kV变电站中各种绝缘子爬电距离的在线带电测量。
Abstract
In the anti-pollution flashover work of the state grid system, it is impossible to measure the creepage distance of electrical equipment online currently. In view of this situation, we developed an on-line measurement system of creepage distance for high voltage insulator based on binocular stereo vision, proposed a method of using a conical off-axis mirror to produce the linear structured light. We discussed the feasibility of two ways to solve the interference problem of strong sunlight, one way used narrowband filters to enhance the contrast ratio of laser line in images, while the other way processed the images with adaptive threshold segmentation and feature point extraction by combining the maximum interclass variance method with the grayscale gravity method. After calibrating the system, the measurement accuracy for the creepage distance of high voltage insulators was tested. Experimental results show that the maximum relative error is 1.45% and the average relative error is 0.69%. It has been successfully applied to the on-line measurement of the creepage distance of various insulators in 110 kV substations.
关键词
双目立体视觉 /
高压绝缘子 /
在线检测 /
光学仪器
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Key words
optical instruments /
binocular stereo vision /
high voltage insulator /
on-line measurement
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基金
国家自然科学基金(11474037);吉林省科技创新人才培育计划青年科研基金项目(20160520015JH)
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CHEN Yaogao, DENG Min, LIN
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