长距离配电线路间接接触保护电器选型探讨  

Discussion on Selection of Indirect Contact Protection Equipment for Long Distance Distribution Lines

作　　者：俞侃 杨文征 丰建华 YU Kan;YANG Wenzheng;FENG Jianhua(The Architectural Design and Research Institute of Zhejiang University Co.,Ltd.,Hangzhou 310028,China)

机构地区：[1]浙江大学建筑设计研究院有限公司,浙江杭州310028

出　　处：《现代建筑电气》2020年第12期5-9,共5页Modern Architecture Electric

摘　　要：随着大体量综合体或超高层项目的涌现,供电半径超长。TN-S系统线路末端出现接地故障时,由于线路超过最大允许长度,导致保护电器的灵敏性失效,动作时间超过固定式设备所要求的5 s,且无法保证其采取等电位联结措施有效性的情况下,采用断路器作间接接触防护会引发电气安全问题。从工程实例出发,通过比较提出了采用熔断器保护能够有效且经济地规避此类问题。With the emergence of large-scale complexes or super high-rise projects,the power supply radius is extremely long.When a ground fault occurs at the end of the TN-S system line,due to the line exceeding the maximum allowable length,the sensitivity of the protection appliance fails,and the action time exceeds the 5 s required by the fixed equipment.At the same time,the effectiveness of equipotential bonding measures cannot be guaranteed,then the use of circuit breakers for indirect contact protection will cause electrical safety problems.Combining by the engineering examples,the use of fuse protection was proposed by comparing,which can effectively and economically avoid such problems.

关 键 词：间接接触防护 长距离配电线路 断路器保护 熔断器保护 

分 类 号：TU852[建筑科学]