港口低压配电设计常见问题分析

Aanlysis of Common problems of low-voltage power distribution design of port

在港口低压配电设计实例中,经常会出现一些不可忽视的常见问题,譬如变压器进线断路器的瞬时保护不满足选择性要求、开关柜出线电缆截面偏小、消防泵配电回路违反规范的强制性条文、剩余电流保护装置选型不当等。通过工程案例,分析造成设计差错的原因,并提出解决问题的思路与方法,供港口电气设计人员参考。

There are always noticeable problems in the port low-voltage distribution design.For example,instantaneous protection of the incoming circuit-breaker for the transformer can＇t meet protection selective requirements,cable sections of L.V switchgears are too small,distribution circuits violate the mandatory provisions,error selections of residual current operated protective devices,and etc.Taking engineering projects as study cases,this paper analyzes the reasons for the design errors,and puts forward train of thought and countermeasures,serving as a reference for port electrical designers.