| 互感引起的零序方向保护误动分析与对策 |
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| 引用本文： | 陈水耀,黄少锋,杨松伟. 互感引起的零序方向保护误动分析与对策[J]. 中国电力, 2016, 49(5): 59-62. DOI: 10.11930/j.issn.1004-9649.2016.05.059.04 |
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| 作者姓名： | 陈水耀 黄少锋 杨松伟 |
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| 作者单位： | 1．华北电力大学电气与电子工程学院，北京102206；2．国网浙江省电力公司检修分公司，浙江杭州311232 |
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| 摘 要： | 某220 kV线路高频零序方向保护在区外故障时误动，保护动作前的电压波形存在明显畸变。通过对电压波形进行谐波分析，发现电容式电压互感器（CVT）暂态特性持续时间比较短，一般在5~10 ms，而零序方向保护动作出口在20 ms以后，从而排除了CVT暂态特性不良引起零序方向保护误动的可能性。同时根据线路两侧零序电压、零序电流及零序阻抗，计算出线路上存在感应电压，从而确认相邻线路互感是导致零序方向保护误判的原因，并有针对性地提出负序电流开放零序方向保护的改进措施。
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| 关 键 词： | 零序方向保护 暂态特性 CVT 互感 |
| 收稿时间： | 2015-10-10 |
Analysis and Countermeasures on a Malfunction of Zero-Sequence Directional Protection Due to Mutual Inductance |
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| CHEN Shuiyao,HUANG Shaofeng,YANG Songwei. Analysis and Countermeasures on a Malfunction of Zero-Sequence Directional Protection Due to Mutual Inductance[J]. Electric Power, 2016, 49(5): 59-62. DOI: 10.11930/j.issn.1004-9649.2016.05.059.04 |
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| Authors: | CHEN Shuiyao HUANG Shaofeng YANG Songwei |
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| Affiliation: | 1. School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China; 2. State Grid Zhejiang Electric Power Corporation Maintenance Branch, Hangzhou 311232, China |
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| Abstract: | A high frequency zero-sequence directional protection of a 220 kV line took false action with obvious distortion on voltage waveform. Through harmonic analysis of voltage waveform, it is found that CVT transient characteristics lasted shortly around 5~10 ms, while zero-sequence directional protection acted 20 ms later. The possibility of malfunction caused by transient characteristics of CVT is excluded. Based on zero-sequence voltage, current and sequence on both sides of protection, the induced voltage is calculated. It is inferred that mutual inductance is the cause of malfunction of zero-sequence directional protection. A new zero-sequence directional protection scheme with negative sequence current opening identification is proposed. |
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| Keywords: | zero-sequenced directional protection transient characteristics CVT mutual inductance |
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