基于故障分量的采样值相关差动母线保护  

Correlated Differential Busbar Protection of Sampling Value Based on Fault Componet

作　　者：李肖博[1] 谭凌[1] 江卫良[1] 郝后堂[1] 

机构地区：[1]国电南瑞科技股份有限公司,江苏南京211106

出　　处：《广东电力》2015年第7期84-87,共4页Guangdong Electric Power

摘　　要：针对采样值差动保护动作边界不易确定并易受干扰的问题,提出一种基于故障分量的采样值相关差动母线保护新方法,利用母线区内、外故障时故障分量差电流和制动电流的相关度大小和分布规律来识别故障。该方法采用短数据窗连续计算相关度,计算结果为采样值积分归一化值,对不良数据和电流互感器饱和有较强的抵御能力,动作边界确定,定值整定简单。动模试验结果表明:该方法能够快速、可靠地切除母线故障,具有较好的保护性能和一定的实用价值。Aiming at the problem of difficulty in determining action boundary of differential protection of sampling value and affection by interference,a kind of new method for correlated differential busbar protection of sampling value based on fault component was proposed which used fault component differential current at the time of internal and external faults in busbar area,correlation size and distribution law of braking current to identify the fault.This method uses short data window to calculate correlation in succession,the calculated result is normalized value of integral of sampling value which has stronger resistance ability against bad data and saturation of current transfer.In addition,action boundary is certain and constant value setting is simple.Dynamic model testing result indicates that this method could rapidly and reliably cut off busbar fault and is provided with better protection performance and practical value.

关 键 词：母线保护 采样值差动保护 相关度 电流互感器饱和 分布特性 故障分量 

分 类 号：TM773.4[电气工程—电力系统及自动化]