中压电缆的热稳定校验

焦建雷（北京兴电国际工程管理有限公司，北京市 100048）

中压电缆的热稳定校验（焦建雷）

Thermal Stability Verification of Medium‑voltage Cables

JIAO Jianlei(Beijing Scientech International Project Management Co.,Ltd.,Beijing 100048，China)

Abstract：According to the short‑circuit current,cable specification and length of the 10 ~ 20 kV busbar of the substation in the grid area,the short‑circuit current of medium‑voltage cables are calculated by the Short‑circuit Current Calculation in Three‑Phase a.c. Systems(GB / T 15544 / IEC 6090),and short‑circuit thermal stability is verified based on the time of relay protection action;the application of short circuit thermal stability verification form of medium‑voltage cables in the national standard atlas 19DX101 - 1 Common Data of Building Electricity are validated and illustrated.

Key words：short‑circuit current;GB / T 15544(IEC method);medium‑voltage cable;cable specification;action time;thermal stability verification;calculation formula;national standard atlas

摘　要：根据电网区域变电站10 ~ 20 kV母线的短路电流、电缆规格及长度，用GB / T 15544 / IEC 6090系列标准《三相交流系统短路电流计算》计算中压电缆短路电流，根据继电保护动作时间来校验短路热稳定；并对国标图集19DX101 - 1《建筑电气常用数据》中中压电缆短路热稳定校验表格的应用进行验证和说明。

关键词：短路电流；GB / T 15544（IEC法）；中压电缆；电缆规格；动作时间；热稳定校验；计算公式；国标图集

中图分类号：TU852   　　　　   文献标识码：A

doi：10.3969 / j. issn.1003 － 8493.2021.02.012