一起220 kV線路縱聯(lián)零序方向保護(hù)誤動(dòng)原因分析及對(duì)策
邵慶祝, 謝民,王同文,王海港
(國(guó)網(wǎng)安徽省電力公司,安徽 合肥 230022)
摘 要:針對(duì)一起220 kV 線路縱聯(lián)零序方向保護(hù)誤動(dòng)事件,分析了環(huán)網(wǎng)系統(tǒng)接地故障零負(fù)序電流分布特征,結(jié)果表明在環(huán)網(wǎng)系統(tǒng)線路區(qū)外特定地點(diǎn)發(fā)生接地故障時(shí),可能出現(xiàn)線路同一側(cè)零負(fù)序功率方向相反的情況,若兩側(cè)功率方向判據(jù)方法不一致,可能導(dǎo)致線路縱聯(lián)零序方向保護(hù)誤動(dòng)。根據(jù)誤動(dòng)原因分析,提出了改進(jìn)措施,對(duì)提升系統(tǒng)線路縱聯(lián)保護(hù)可靠運(yùn)行有良好的借鑒作用。
關(guān)鍵詞:縱聯(lián)零序方向保護(hù);接地故障;誤動(dòng);功率方向判據(jù)
中圖分類號(hào):TM773 文獻(xiàn)標(biāo)識(shí)碼:B 文章編號(hào):1007-3175(2018)08-0059-04
Analysis of Malfunction of 220 kV Line Pilot Zero-Sequence Direction Protection and Its Countermeasures
SHAO Qing-zhu, XIE Min, WANG Tong-wen, WANG Hai-gang
(State Grid Anhui Electric Power Company, Hefei 230022, China)
Abstract: In view of a malfunction event of 220 kV line pilot zero-sequence direction protection, this paper analyzed the distribution characteristics of the zero-negative-sequence current of grounding fault in the loop network system. The analysis shows that the zero-negativepower on one end of a line could be in the opposite direction when the grounding fault occurs at a specific location outside of the line in the loop network system. If the power direction criterion on two ends of the line is inconsistent, it may cause the malfunction of the line pilot zero-sequence direction protection. On the basis of the analysis of malfunction causes. This paper puts forward some improving measures, which could be used to improve the reliability of the line pilot protection with good reference functions.
Key words: pilot zero-sequence direction protection; grounding fault; malfunction; power direction criterion
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