基于断路器保护的配电线路最大敷设长度研究

Research of Maximum Wire Length Base on Circuit Breaker Protection

根据国家标准GB10963、GB50054、GB/T15544对断路器短路时电磁脱扣的要求,以及结合最小短路电流计算的方法,推导出满足断路器短路保护要求的不同截面配电线路的最大敷设长度计算公式,计算出短路时断路器对配电线路的最大保护长度数值。计算结果表明,低压配电线路并不是在安装了短路保护断路器后就可以无限长敷设,当超过断路器最大保护长度时,断路器将不能可靠跳闸,线路将失去保护。

In order to protect the end of wire short-circuit fault,according to the electron-releasing requirement of national standards as GB GB10963,GB50054,GB / T15544 to short-circuit breaker,and combined the method of minimum short-circuit current calculation,the formula of Maximum Wire Length for Circuit Breaker Short-Circuit Protection was deduced in the paper. Calculation results of the formula shows that the wire would lose protection when its length exceeded the maximum short-circuit protection length.