从用户端角度确定低压成套开关设备额定电流
陈中原，王静
（新疆维吾尔自治区产品质量监督检验研究院，新疆 乌鲁木齐 830011）
摘 要：GB 7251.1—2013 中规定“一条电路的额定电流可低于安装在这条电路中( 根据各自的器件标准) 的额定电流”，但是低于多少标准值并未给出。结合日常检验工作案例，分析了过度降容法确定低压成套开关设备和控制设备额定电流存在的弊端，从用户端的角度提出确定低压成套开关设备和控制设备额定电流应采用“额定分散系数× 调整系数× 断路器的额定电流”的方法，从而保证了低压成套开关设备和控制设备过载保护功能的有效实施。
关键词：低压成套开关设备和控制设备；额定电流；额定分散系数；调整系数
中图分类号：TM591 文献标识码：A 文章编号：1007-3175(2016)06-0055-03
Determination of Rated Current of Low-Voltage Switchgear from Customers Perspective
CHEN Zhong-yuan, WANG Jing
（Xinjiang Uygur Autonomous Region Product Quality Supervision and Inspection Institute, Urumqi 830011 , China）
Abstract: GB 7251.1—2013 mentioned “the rated current of a circuit may be lower than the rated currents of the devices (according to the respective device standard) installed in this circuit”, but the standard doesn’t give limits how much lower it can be.Combining with the routine testing work case, this paper analyzed the disadvantages of excessive reducing capacity method to determine the rated currents of low-voltage switchgear and control gear assemblies and proposed to adopt “rated diversity factor×modify factor×rated current of circuit-breakers” method from the customers perspective to determine the rated currents of low-voltage switchgear and control gear assemblies, so as to ensure the overload protection function of the low-voltage switchgear and controlgear assemblies implemented effectively.
Key words: low-voltage switchgear and control gear assemblies; rated current; rated diversity factor; modify factor
参考文献
[1] GB 7251.1—2013 低压成套开关设备和控制设备 第1 部分：总则[S].
[2] GB 14048.2—2008 低压开关设备和控制设备 第2部分：断路器[S].
[3] 中国航空工业规划设计研究院. 工业与民用配电设计手册[K]. 3 版. 北京：中国电力出版社，2005.
[4] GB 7251.12—2013 低压成套开关设备和控制设备第2 部分：成套电力开关和控制设备[S].
