【摘要】 带旁路母线的母线接线方式,当投入代路运行时,将影响大差回路差动电流的计算,使起动元件失去选择性,并且在倒闸过程中,由于实际运行方式的不可知,可能引起保护误动作。分析了母线代路运行和常规运行的特点,总结两种运行方式对母联单元接线系数的影响,提出了一种在微机保护平台上,结合刀闸位置和压板输入,自适应地选择大差计算公式的新方案,并且在倒闸过程中,采用两种差动计算公式“与”的方法,提高了母差保护动作的正确性。更多还原

【Abstract】 In the substituting situation,bus-bar differential relays may loose the selecting capability because of the wrong differential current and mal-operation because of the unknown operation mode during switching situation.After analyzing characters of substituting situation and normal situation,this paper presents a new method,based on the isolator auxiliary contact and the hands joint,for selecting the proper differential expression,and an "and" algorithm of two differential expressions in switching operation.It improves the accuracy of differential bus-bar protection and provides a new way to make one algorithm for all types of bus arrangements.更多还原