中国电力 ›› 2016, Vol. 49 ›› Issue (12): 42-47.DOI: 10.11930/j.issn.1004-9649.2016.12.042.06

• 电网 • 上一篇    下一篇

一种基于直方图对称关联度的电流互感器饱和检测算法

王宇恩1,高昌培1,白加林1,牛静1,赵武智1,赵建新2,黄婷3,马玉龙3   

  1. 1. 贵州电网有限责任公司电力调度控制中心,贵州 贵阳 550002;
    2. 北京四方继保自动化股份有限公司 技术支持部,北京 100085;
    3. 华北电力大学 电气与电子工程学院,北京 102206
  • 收稿日期:2016-08-12 修回日期:2016-12-29 出版日期:2016-12-20 发布日期:2016-12-29
  • 作者简介:王宇恩(1976—),男,贵州贵阳人,高级工程师,从事电力系统继电保护管理方面的工作。E-mail: gzdlwyn@126.com

TA Saturation Detection Algorithm Based on Histogram Symmetry Correlation

WANG Yu’en1, GAO Changpei1, BAI Jialin1, NIU Jing1, ZHAO Wuzhi1, ZHAO Jianxin2, HUANG Ting3, MA Yulong3   

  1. 1. Dispatching and Control Center of Guizhou Power Co., Ltd., Guiyang 550002, China;
    2. The Beijing Sifang Automation Co., Ltd., Beijing 100085, China;
    3. The Electrical and Electronic Engineering School, North China Electric Power University, Beijing 102206, China
  • Received:2016-08-12 Revised:2016-12-29 Online:2016-12-20 Published:2016-12-29

摘要: 电流互感器(TA)饱和是一种物理现象,可能导致保护继电器的误动作。针对这种现象,提出一种利用频率分布直方图结合关联度的方法检测TA的饱和情况。首先对TA二次侧电流进行采样分析,然后利用波形镜像变换技术将波形变换,并做出其直方图,计算出其对称关联度,与定值比较即可判断TA是否发生饱和。算法简单可靠,具有精度高,计算速度快的特点,对于继电保护领域检测TA饱和,提高保护动作的可靠性,维护系统正常运行等方面具有重要的参考意义。

关键词: TA饱和, 直方图, 对称关联度, 保护, 波形镜像变换

Abstract: Current transformer (TA) saturation is a physical phenomenon which could lead to protective relay malfunction. A TA saturation detection method using frequency distribution histograms combining symmetry correlation is proposed. First of all, TA secondary current is sampled and analyzed, and then wave conversion is transformed by using waveform image transformation technology. Then, correlation degree of symmetry is calculated with generated histogram. Finally, the correlation degree is compared with setting value to determine whether current transformer saturation occurs or not. Proposed algorithm is simple, reliable, accurate and fast. It has important reference value for detecting TA saturation, improving the reliability of action and maintaining system operation.

Key words: TA saturation, histogram, symmetry correlation, protection, waveform image transformation

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