500kV中性点经小电抗接地自耦变压器后备保护整定计算的研究  

Study on backup protection setting for 500 kV autotransformer with neutral point grounding by small reactance

作　　者：颜丽娟[1] 杨淑英[1] 倪腊琴[2] 龚仁敏 周庆捷 

机构地区：[1]华北电力大学,河北保定071003 [2]华东电网有限公司,上海200002 [3]中恒博瑞数字电力科技有限公司,北京100085

出　　处：《电力系统保护与控制》2012年第2期77-81,87,共6页Power System Protection and Control

基　　金：科技部技术创新基金项目(07C26221100021)

摘　　要：基于自耦变压器与普通变压器的结构差异,介绍了中性点经小电抗接地自耦变压器零序短路参数及公共支路零序电流计算方法,提出了应注意的问题。分析了一般500 kV自耦变压器保护的构成特点,根据'加强主保护,简化后备保护'的原则,对后备保护配置及整定过程进行了简化,不仅简化了后备保护的多段配置,甚至取消了高、中压侧零序电流保护,同时详细论述了其过程和理论依据。利用继保整定及仿真软件对实例进行故障分析、整定计算及保护动作行为仿真,仿真结果表明该后备保护动作可靠,逻辑简单,易于实现。Based on the structural differences between autotransformer and normal transformer, methods of computing zero sequence circuit parameters and common branch zero sequence circuit of autotransformer with neutral point grounding by small reactance are introduced with proposing the notable problems. Constitution characteristics of 500 kV autotransformer protection are analyzed, and the backup protection configuration and setting process are simplified according to the principles of ＂strengthen main protection, simplify backup protection＂, which not only simplifies the multi-step configuration of back protection, but also cancels zero sequence current protection of high and medium voltage side, meanwhile the theoretical basis and process are expounded. Making a fault analysis, setting calculation and the protection action simulating on an instance by the software of the protection setting and simulation, the result demonstrates that this back-up protection has a reliable action, simple logic, and can be easily realized.

关 键 词：500 KV自耦变压器 中性点经小电抗接地 变压器后备保护 整定计算 

分 类 号：TM744[电气工程—电力系统及自动化]