高阻抗母线差动保护原理及在中压母线中的应用

Principle of High Impedance Busbar Differential Relay Protection and Application for MV Busbar

通过介绍高阻抗母线差动保护的原理,分别对母线保护区外故障、区内故障、电流互感器饱和带来的差流影响三种不同工况下的高阻抗母线差动保护的工作原理进行了理论分析。以某国外项目正在实施的33kV母线保护为例,对电流互感器参数选型、稳定电阻的选择、保护整定值计算选择等进行实际的推导计算,并给出最终的选型参数及整定值清单。

This article introduces the principle of high-impedance busbar differential protection,and the working principle of high-impedance busbar differential protection under three different working conditions:faults out-side the busbar protection zone,faults inside the busbar protection zone,and differential currents caused by current transformer saturation.Taking the 33kV busbar protection being implemented in a foreign project as an example,the actual derivation and calculation of current transformer parameter,stabilizing resistor selection,protection setting value calculation,etc.are carried out,and final selection parameters and setting value list are given.