基于采样值信息实现双绕组变压器快速保护的原理  

Rapid Protection Principle Implementation for Two-winding Transformer Based on Sampling Value Information

作　　者：刘利华 孙鸣[2] 

机构地区：[1]安徽省电力公司培训中心,安徽省合肥市230022 [2]合肥工业大学电气与自动化工程学院,安徽省合肥市230009

出　　处：《电力系统自动化》2012年第22期100-103,共4页Automation of Electric Power Systems

摘　　要：针对大型双绕组变压器保护快速性的要求,分析了双绕组变压器不同侧采样电流及其突变量序列的相位特征和采样电流(电压)绝对值突变量正(负)突变的特征,介绍了在单、双侧电源条件下基于采样值信息实现变压器严重故障快速切除的保护原理。该保护原理具有算法简单、动作速度快、灵敏度高、允许变压器两侧电流互感器(TA)有较大的相位偏差,以及具有较强的抗TA饱和能力等特点,在解决涌流对变压器保护的影响、电流差动速断保护在TA严重饱和时有可能误动等特殊问题方面具有独特优势。In view of rapid protection requirements of large two-winding transformer, both sides sampling currents of two- winding transformer, their mutational quantity sequence phase characteristics and the characteristics of sampling current （voltage） absolute positive （negative） mutation are analyzed. Also, the protection principle to fast remove serious transformer fault based on sampling value information under power supply on single and on both side is introduced. The protection principle has some good characteristics such as simple algorithm, fast operation speed, high sensitivity, large phase discrepancy permission between current transformers on both sides of transformer and strong ability to resist current transformer saturation, etc. In addition, it has unique advantages in solving special problems such as inrush current impact on transformer protection, malfunction of instantaneous current differential protection when current transformer is in serious saturation.

关 键 词：变压器 差动保护 快速保护 采样值信息 

分 类 号：TM772[电气工程—电力系统及自动化]