一起220 kV線路縱聯(lián)零序方向保護誤動原因分析及對策
邵慶祝, 謝民,王同文,王海港
(國網(wǎng)安徽省電力公司,安徽 合肥 230022)
摘 要:針對一起220 kV 線路縱聯(lián)零序方向保護誤動事件,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)外特定地點發(fā)生接地故障時,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)零序方向保護誤動。根據(jù)誤動原因分析,提出了改進措施,對提升系統(tǒng)線路縱聯(lián)保護可靠運行有良好的借鑒作用。
關(guān)鍵詞:縱聯(lián)零序方向保護;接地故障;誤動;功率方向判據(jù)
中圖分類號:TM773 文獻(xiàn)標(biāo)識碼:B 文章編號: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
參考文獻(xiàn)
[1] 李鋼,馮辰虎,孫集偉,等. 平行運行線路互感對縱聯(lián)零序方向保護的影響[J]. 華北電力技術(shù),2007(12):1-4.
[2] 李鋼, 路潔, 白晶, 等. 一起平行運行線路縱聯(lián)零序方向保護誤動分析[J]. 電力系統(tǒng)自動化,2008, 32(14):104-107.
[3] 張琦兵. 平行線弱電強磁下零序方向元件的改進[J]. 電力系統(tǒng)自動化,2013,37(7):94-98.
[4] 田寶江,張?zhí)愜?,? 不平衡零序電流對縱聯(lián)零序保護的影響分析及其對策[J]. 電力系統(tǒng)自動化,2013,37(19):132-135.
[5] 陳水耀, 姚仲煥. 電壓回路中性線對零序方向保護的影響分析與防范措施[J]. 繼電器,2008,36(14):80-82.
[6] 陳文哲,郝治國,張保會,等. 同塔雙回線縱向故障特征分析及零序方向保護改進[J]. 電力自動化設(shè)備,2016,36(11):133-139.
[7] 謝俊,李勇,劉宏君,等. 線路縱聯(lián)零序方向保護誤動機理分析及對策研究[J]. 電力系統(tǒng)保護與控制,2017,45(4):19-25.
[8] 蔣蘇靜,畢天姝,徐振宇,等. 平行雙回線路縱聯(lián)零序方向誤動原因分析及負(fù)序功率方向研究[J].電力系統(tǒng)保護與控制,2009,37(24):21-26.
[9] 陳水耀,黃少鋒,楊松偉. 互感引起的零序方向保護誤動分析與對策[J]. 中國電力,2016,49(5):59-62.