城市轨道交通直流断路器触头烧损情况检测新方法

直流断路器触头烧损会降低断路器的载流能力,现常采用测量静触头底座至动触头羊角间距离及接触电阻的方法进行触头烧损情况检测。但这些方法不能完全反映触头烧损情况。提出了通过测量触头接触面积来判断触头烧损情况的检测新方法。实践验证结果显示,该方法简单直观、便于操作、准确性较高,可作为触头烧损情况的辅助检测手段。

New Detection Method for the DC Circuit Breaker Contact Burnout of Urban Rail Transit

The burnout of DC circuit breaker contact will reduce the current carrying capacity of circuit breaker.The methods of measuring the distance between the static contact base and the moving contact claw,and the contact resistance are often used to detect the contact burning situation.However,these methods cannot fully reflect the contact burning loss.A new detection method to judge the burning loss of the breaker contact by measuring the contact area is proposed,and the practical verification results show that the method is simple and intuitive,easy to operate with high accuracy.Therefore,it can be adopted as an auxiliary detection method for the contact burnout.