变压器差动保护的三种比率制动方式及其系数整定的研究  

Research on three kinds of percentage restraint methods and their coefficient setting of transformer differential protection

作　　者：金瑞[1] 鲍斌 时伯年[1] JIN Rui;BAO Bin;SHI Bonian(Beijing Sifang Automation Co.,Ltd.,System Analysis&Control Dept.,Beijing 100085,China;Northeast China Power Dispatching Center,Shenyang 110180,China)

机构地区：[1]北京四方继保自动化股份有限公司系统分析与控制研发部,北京100085 [2]东北电力调控分中心,辽宁沈阳110180

出　　处：《电力系统保护与控制》2018年第19期81-87,共7页Power System Protection and Control

基　　金：国家重点研发计划资助(2016YFB0900500);国家高技术研究发展计划资助(863计划)(2013AA050104)~~

摘　　要：变压器差动保护的比率制动方式不同,其灵敏度和安全性也不同。不同厂家的保护装置同时作为变压器的主保护时,因为采用不同的比率制动方式,即使按照推荐定值整定比率制动系数,保护的动作性能也有差异。比较了国内外广泛应用的三种比率制动方式:MAX方式、AVE方式和PHA方式。在具体算例中,比较了三种比率制动方式的灵敏度和安全性。发现即使取厂家推荐的比率制动系数,在区外某处发生故障导致CT一定程度饱和时,采用某些制动方式的差动保护也不能避免误动,需要适当调整比率制动系数的定值,或采用额外的故障类型判据闭锁出口。The sensitivity and security of transformer differential protection are not the same due to different percentage restraint methods.When IEDs from various suppliers are both applied as main protections for a transformer,since different percentage restraint methods are applied,they will not trip coherently when they are set default percentage restraint coefficients.The paper first compares three percentage restraint methods applied widely at home and abroad,i.e.MAX,AVE and PHA.Besides,via a calculation example,it compares sensitivity and security of the three methods.It is found that when default percentage restraint coefficients are set,differential protections with certain percentage restraint method will not avoid mal-operation when external faults occurs at certain location with CT saturation to some extent.Percentage restraint coefficients should be adjusted to suitable value,or additional fault type criteria should be added to block tripping.

关 键 词：变压器保护 差动保护 比率制动系数 整定 灵敏度 安全性 

分 类 号：TM774[电气工程—电力系统及自动化]