小负荷供电中低压短路电流的计算与校验

Calculation and Verification of Low Voltage Short-Circuit Current in Small Load Power Supply

介绍了低压配电中计算短路电流时的假定条件,针对小负荷用电设备的供电距离的不同情况,探讨了其对短路电流计算的影响,阐述了在选取不同类型的断路器的保护电流整定值需要注意的问题,分析了短路热稳定校验和灵敏度的校验时对断路器和电缆的合理性选择,可为低压小负荷供电的电气设计提供参考。

This paper introduced the hypothetical conditions for calculating short-circuit current in low voltage distribution.In view of the different power supply distances of small-load electrical equipment,the influence of short-circuit current calculation was discussed.The problems needing attention in choosing the setting values of protective current for different types of circuit breakers were put forward.The rational selections of circuit breakers and cables were analyzed when checking short-circuit thermal stability and sensitivity.It can provide reference for the electrical design of low voltage and low-load power supply.