电力系统自动化中智能指针型仪表自动校验方法研究
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摘要
针对当前仪表自动检验方法使用Hough变换检测仪表指针所处直线的参数,受到表盘中阴影区域的影响无法准确确定指针分度线及其长度,存在校验精度低、速度慢等问题。针对上述问题,提出基于计算机视觉的智能指针型仪表自动校验方法。将RGB色彩模式下的仪表图像转至HSI颜色模型空间中,消除阴影区域影响,并采用HSI颜色模型饱和度分量作为特征参数分割出表盘区域;采用投影和截口技术结合边缘检测快速定位出指针及分度线位置,采用点-弧线投影极值检测法在Hough变换检测的基础上,确定指针分度线长短。对比表盘指针指向关键刻度线相对于零刻度线的偏转角度与标准偏转角,若超过允许误差范围则返回重调,完成仪表自动校验。实验结果表明,所提方法校验精度高,速度快,整体性能满足电力系统工程要求。
For the current automatic meter inspection method,the Hough transform is used to detect the parameters of the straight line where the pointer of the instrument is located.The influence of the shaded area in the dial can not accurately determine the pointer index line and its length,and there are problems such as low calibration accuracy and slow speed.Aiming at the above problems,an intelligent automatic calibration method based on computer vision is proposed.The instrument image in RGB color mode is transferred to the HSI color model space to eliminate the influence of the shadow region,and the HSI color model saturation component is used as the feature parameter to segment the dial region.The projection and the kerf technique are combined with the edge detection to quickly locate the pointer.The point-arc projection extreme value detection method is used to determine the length of the pointer index line based on the Hough transform detection.The comparison dial pointer points to the deflection angle of the key tick mark relative to the zero tick mark and the standard deflection angle.If the allowable error range is exceeded,the re-adjustment is returned to complete the automatic calibration of the instrument.The experimental results show that the proposed method has high calibration accuracy and high speed,and the overall performance meets the requirements of power system engineering.
For the current automatic meter inspection method,the Hough transform is used to detect the parameters of the straight line where the pointer of the instrument is located.The influence of the shaded area in the dial can not accurately determine the pointer index line and its length,and there are problems such as low calibration accuracy and slow speed.Aiming at the above problems,an intelligent automatic calibration method based on computer vision is proposed.The instrument image in RGB color mode is transferred to the HSI color model space to eliminate the influence of the shadow region,and the HSI color model saturation component is used as the feature parameter to segment the dial region.The projection and the kerf technique are combined with the edge detection to quickly locate the pointer.The point-arc projection extreme value detection method is used to determine the length of the pointer index line based on the Hough transform detection.The comparison dial pointer points to the deflection angle of the key tick mark relative to the zero tick mark and the standard deflection angle.If the allowable error range is exceeded,the re-adjustment is returned to complete the automatic calibration of the instrument.The experimental results show that the proposed method has high calibration accuracy and high speed,and the overall performance meets the requirements of power system engineering.
引文
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[13] 王庆,屈鸣,吴维德,等.低压电流互感器电气综合试验检定系统设计与实现[J].自动化与仪器仪表,2017(1):55-58.
[14] 张弘,刘东,马春雷,等.主动配电网信息模型的自动差异比对映射与校验[J].南方电网技术,2016,10(12):24-31.
[15] 钟桂森,易清明,石敏.一种新型的10G以太网并行循环冗余校验设计[J].计算机工程,2016,42(5):292-296.
[2] 王哲,崔西明,濮海明,等.钢管厚度及分层自动超声检测工艺和校准方法研究[J].中国测试,2017,43(3):1-4.
[3] 杨青,黄树帮,张海东,等.智能变电站信息模型工程应用标准化校验技术[J].电力系统自动化,2016,40(10):132-136.
[4] 黄彦,黄劼,陈凌,等.基于多数据源校验的电网EMS数据质量在线监控方法及其实现[J].电力系统保护与控制,2017,45(17):130-135.
[5] 李祖贺,刘嘉,薛冰,等.面向自动校验系统的指针式压力表读数识别[J].计算机工程与应用,2016,52(23):213-219.
[6] 钱斌,肖勇,林伟斌,等.关口电能表远程在线校验方法及其技术实现[J].电测与仪表,2017,54(18):101-105.
[7] 耿俊成,张小斐,郭志民,等.基于离散Fréchet距离和剪辑近邻法的低压配电网拓扑结构校验方法[J].电测与仪表,2017,54(5):50-55.
[8] 鲁华永,袁越,郭泓佐,等.基于正则表达式的变电站集中监控信息解析方法[J].电力系统自动化,2017,41(5):78-83.
[9] 肖峻,郭伟,俞伟,等.高中压配电网的一体化安全性校验方法[J].高电压技术,2016,42(7):2047-2053.
[10] 崔迎宾,张卫欣,单增礼,等.低压电力线载波通信的系统化测试方法[J].电力系统及其自动化学报,2018(1):81-87.
[11] 赵坤鹏,吴龙胜,马徐瀚,等.一种基于矩阵的并行CRC校验算法[J].电子设计工程,2017,25(3):85-88.
[12] 戴翔,周光,张舸.热工仪表与自动化仪表的检修和校验[J].自动化与仪器仪表,2017,(7):235-236.
[13] 王庆,屈鸣,吴维德,等.低压电流互感器电气综合试验检定系统设计与实现[J].自动化与仪器仪表,2017(1):55-58.
[14] 张弘,刘东,马春雷,等.主动配电网信息模型的自动差异比对映射与校验[J].南方电网技术,2016,10(12):24-31.
[15] 钟桂森,易清明,石敏.一种新型的10G以太网并行循环冗余校验设计[J].计算机工程,2016,42(5):292-296.
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