WXB-11型微机保护允许最小负荷阻抗的探讨

The Allowance Minimum Load Impedance of Microcomputer-based Protection Type WXB-11

距离保护允许电流的计算是一个不容忽视的问题，过去一直延用的经验公式只适用于园特性的阻抗元件。本文提出了针对WXB-11型微机保护的多边形阻抗元件计算其允许最小阻抗以及按躲过最小负荷阻抗对该元件进行整定的方法。其正确性已在实践中得以验证。

It is not ignored a issue to caculate allowance current of the distance protection, the experience formaula used in the past was only available to the characteristic impedance component. This paper put forward caculation of the allowance minimum impedance for polygon impedance com-ponent of the microcomputer-based protection type WXB-11 f and the component set method in acc-ordance with avoiding minimum load impedance. The validity has been proved in the practice.