适用于多点T接的新型电流差动保护

赵萍; 裘愉涛; 徐华; 郑远德; 徐晓春; 谈浩; 李奔

引用本文:	赵萍,裘愉涛,徐华,等.适用于多点T接的新型电流差动保护[J].电力系统保护与控制,2017,45(20):152-157.
	ZHAO Ping,QIU Yutao,XU Hua,et al.A new current differential relay scheme for multi “T” nodes transmission line[J].Power System Protection and Control,2017,45(20):152-157

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适用于多点T接的新型电流差动保护
赵萍¹,裘愉涛²,徐华¹,郑远德¹,徐晓春³,谈浩³,李奔³
(1.国网浙江省电力公司台州供电公司，浙江台州 318000;2.国网浙江省电力公司，浙江杭州 310007; 3.南京南瑞继保电气有限公司，江苏南京 211021)

摘要:

随着近年新能源的发展以及电网建设经济性的因素，多点T接线路正在被大量使用。对多点T接线路的特征进行提取，并针对性地对常规线路保护影响进行了评估，进而提出了适用于多点T接线路的多端线路电流差动保护方案。提出的电流差动保护方案采用主从式的拓扑结构，易进行多点T接系统的扩展，并在此结构的基础上提出了基于多端系统的同步方式。提出了一种新型适用于多点T接线路的差动方程，能够解决多点T接线路可能出现的电流汲出和T点增加带来的灵敏度的问题。经过大量的动模仿真实验表明，提出的适用于多点T接线路的新型电流差动保护具有极高的灵敏性和可靠性，具有推广应用价值。

关键词: 多点T接自适应制动系数差动保护

DOI：10.7667/PSPC161722

分类号:

基金项目:国家电网公司科技项目(SGTYHT/15-JS-193)

A new current differential relay scheme for multi “T” nodes transmission line

ZHAO Ping¹,QIU Yutao²,XU Hua¹,ZHENG Yuande¹,XU Xiaochun³,TAN Hao³,LI Ben³

(1. Taizhou Power Supply Company, State Grid Zhejiang Electric Power Company, Taizhou 318000, China;2. State Grid Zhejiang Electric Power Company, Hangzhou 310007, China;3. NR Electric Co., Ltd., Nanjing 211021, China)

Abstract:

With the development of new energy and economic factor of power grid construction in recent years, multi-T nodes transmission line has been widely used. This paper extracts the fault characteristics of multi-T nodes transmission line, then evaluates the effects of the normal protection when it is applied in these special lines. A new current differential protection scheme is proposed using the topology of master-slave structure, which fits for multi-T nodes transmission line for its easy extension. On this basis, a synchronous mode based on multi-terminal system is proposed. This paper figures out a new type of current differential equation suitable for T-terminal lines which could handle the contradiction between sensitivity and reliability with multi terminals. With plenty dynamic simulation experiments, the results show that the new type of current differential protection, which is suitable for multi-T node transmission line, has high sensitivity and reliability, and has the value of popularization and application.

Key words: multi-T nodes self-adaptive resistance ratio differential protection

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