低压配电系统热稳定校验分析

Analysis of Thermal Stability Verification From Low-Voltage Distribution System

在低压配电设计中,配电线路的保护是非常重要的,它保证整个配电系统的正常运行与故障处理,对人身安全和财产保护起着重要的作用。在短路保护中,往往容易忽视热稳定校验确定导体截面的步骤,但热稳定校验很有必要,尤其对低压配电柜出线回路。本文通过Excel分别对不同变压器容量下低压配电柜配出不同规格截面的电缆,进行热稳定校验,并分析总结热稳定校验导体截面应注意的问题,供设计时参考。

Protection of distribution lines is very important in low voltage distribution design,which guarantees the normal operation and fault handling for the whole system,and plays an important role in personal safety and property protection.In short circuit protection,it is easy to overlook to determine the conductor cross section by thermal stability verification.Especially,it is necessary to calibrate the thermal stability of the outlet loop of the low-voltage distribution cabinet.This paper summarized the thermal stability verification in the conditions of the low-voltage distribution cables of different sections under different transformer capacity through Excel calculation.Problem concerned in the thermal stability verification conductor section were analyzed for reference in design.