短路热稳定校验计算方法分析

在供配电设计过程中,在确定断路器和导线截面后,我们需要对短路情况下导线的热稳定性进行校验。目前断路器具有明显的限流作用,本文阐述限流作用对原有热稳定校验公式中参数取值的影响及短路电流持续时间的不确定性,建议改用允通能量曲线进行热稳定校验,并举例说明。

Analysis on the Calculation of Thermal Stability against Short Circuit

During the power supply designing, we should check the thermal stability of the wire in short-circuit cases after determining the circuit breaker and wire section. At present, the current limiting effect of circuit breaker is obvious. This paper described the influence of the current limiting effect on the parameter value in the formula original of thermal stability test and the uncertainties of short circuit current＇s duration, and suggested to use the passablle energy curve for thermal stability test and gives an example.