| 引用本文: | 白加林,高昌培,王宇恩,等.基于频数分布的防止变压器差动保护误动的新方法[J].电力系统保护与控制,2016,44(8):14-21. |
| BAI Jialin,GAO Changpei,WANG Yuen,et al.A new algorithm based on frequency distribution for avoiding the mal-operation of transformer differential protection[J].Power System Protection and Control,2016,44(8):14-21 |
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| 基于频数分布的防止变压器差动保护误动的新方法 |
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白加林1, 高昌培1, 王宇恩1, 赵武智1, 牛静1, 赵建新2, 黄婷3, 郑涛3
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1.贵州电网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
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| 摘要: |
| 为有效防止变压器区外故障因CT饱和引起的差动保护误动，提出了一种基于频数分布的检测CT饱和的新方法。该方法截取从故障发生到差流达到第一个极值之间的部分差流波形并经适当变换，利用频数分布直方图进行电流波形处理。根据频数分布特征，能够实现CT严重饱和、一般饱和、轻度饱和情况下变压器区内外故障的准确检测。该方法只需定位故障发生时刻，而不需定位差流出现时刻，算法简单，快速可靠。经大量仿真实验验证了新方法的可靠性和准确性。 |
| 关键词: 变压器保护 差动保护 波形变换 CT饱和检测 频数分布 |
| DOI：10.7667/PSPC151064 |
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| A new algorithm based on frequency distribution for avoiding the mal-operation of transformer differential protection |
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BAI Jialin1, GAO Changpei1, WANG Yuen1, ZHAO Wuzhi1, NIU Jing1, ZHAO Jianxin2, HUANG Ting3, ZHENG Tao3
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1.Guizhou Power Dispatching and Control Center, Guiyang 550002, China;2.The Beijing Sifang Automation Co., Ltd., Beijing 100085, China;3.School of Electrical and Electronic Engineering,North China Electric Power University, Beijing 102206, China
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| Abstract: |
| To avoid the mal-operation of transformer differential protection when out-zone fault occurs under current transformer (CT) saturation, a new algorithm based on frequency distribution is proposed. A new current waveform is obtained by a symmetric transformation of initial part of differential current after fault occurred, and then its characteristic is extracted by frequency distribution histogram. In the case of CT’s serious saturation, medium saturation, mild saturation, the out-zone fault and the inner-zone fault can be clearly detected by the proposed algorithm. This algorithm only needs detecting the time of fault occurring, while the time of differential current increasing is no more needed, the proposed algorithm is very fast and reliable. Simulation show satisfactory results and validate its flexibility and reliability. |
| Key words: transformer protection differential protection waveform transformation CT’s saturation detection frequency distribution |
