摘要
结合某地下建筑排风机供电设计实例,从实际计算的角度探讨了TN系统过电流保护电器兼作间接防护电器时有关灵敏度校验的问题。提出对于远距离供电线路,利用过电流保护电器兼作间接防护电器的做法并不能达到保护要求,须重视保护灵敏度的校验,并通过加装剩余电流保护器,以便在发生接地故障时及时切除故障。
Combining by the power supply design of exhaust fan in an underground building,from the actual computational perspective,this paper discussed the sensitivity calibration problem of overcurrent protection appliances used as indirect protection in TN system. It is pointed out that the practice of overcurrent protection appliances used as indirect protection cannot meet the protection requirements for the long-distance power supply line,which should pay attention to the calibration of protection sensitivity. The residual current protector is equipped in order to timely remove the fault when the grounding fault happens.
出处
《现代建筑电气》
2016年第4期33-34,55,共3页
Modern Architecture Electric
关键词
接地故障
过电流保护电器
相保阻抗
灵敏度
grounding fault
overcurrent protection device
phase-protection impedance
sensitivity
作者简介
陈剑峰（1986-），男．工程师。从事供配电系统设计工作。
