预装式变电站接地回路短时耐受电流及导体截面积探讨
王鹏程
(正泰电气股份有限公司，上海 201614)
摘 要：应用于10 kV 电压等级的配电网中的预装式变电站，接地回路的额定短时耐受电流的参数值和导体截面积的选择直接关系到产品的安全、可靠运行。从预装式变电站中变压器的高压侧和低压侧预期的短路电流出发，确定出变压器低压侧短时耐受电流值和接地回路导体截面积，以此为基点，结合高压侧接地回路的额定短时耐受电流和导体截面积，最终确定出预装式变电站的接地回路的额定短时耐受电流、短路持续时间及导体截面积，作为预装式变电站产品设计和型式试验的选用依据。
关键词：变压器；电弧故障电流；接地回路导体截面积；额定短时耐受电流Ike ；短路持续时间tke
中图分类号：TM63 文献标识码：B 文章编号：1007-3175(2022)03-0059-04
Discussion on Short-Time Withstand Current and Conductor Section of
Grounding Circuit in Prefabricated Substation
WANG Peng-cheng
（Chint Electric Co., Ltd, Shanghai 201614, China）
Abstract: The prefabricated substation is used in a distribution network of 10 kV voltage level. The parameter value of the rated shorttime withstand current of the ground loop and the selection of the conductor cross-sectional area are directly related to its safe and reliable operation.This paper studied the short-circuit current of the high-voltage side and low-voltage side of the prefabricated transformer to determine the short-time withstand current value of the low-voltage side of the transformer and the cross-sectional area of the grounding circuit conductor.This research combined the rated short-time withstand current and conductor cross-sectional area of the high-voltage side ground loop based on the short-time withstand current value of the low-voltage side of the transformer and the cross-sectional area. It determined the rated short-time withstand current, short-circuit duration, and conductor cross-sectional area of the grounding loop. It indicates that these factors could be the basis of the selection of the product design and type test of the prefabricated substation.
Key words: transformer; arc fault current; cross-sectional area of grounding circuit conductor; rated short-time withstand current Ike; shortcircuit duration tke
参考文献
[1] 中国电器工业协会. 高压/低压预装式变电站：GB/T17467—2020[S] . 北京：中国标准出版社，2020 ：6-12.
[2] 中国电器工业协会. 低压成套开关设备和控制设备第 1 部分：总则：GB 7251.1—2013[S]. 北京：中国标准出版社，2013 ：57-64.
[3] 中国电器工业协会.3.6 kV～40.5 kV 交流金属封闭开关设备和控制设备：GB/T 3906—2020[S]. 北京：中国标准出版社，2020 ：75.
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