李金林（广东博意建筑设计院有限公司，广东省佛山市 528311）

民用建筑常用电缆热稳定校验分析（李金林）

Thermal Stability Verification Analysis of Cables Commonly Used in Civil Buildings

LI Jinlin（Guangdong Boyi Architectural Design Institute Co.,Ltd.,Foshan 528311,

Guangdong Province，China）

    Abstract： In allusion to the design of the most common low‑voltage power distribution system in civil buildings,the short‑circuit thermal stability verification analysis is carried out for the cables under the most unfavorable cases. It is inferred,due to the current limiting characteristics of the protective electrical appliances,that the main decisive factor for designing and selecting the specifications of the feeder cables used for the low‑voltage power distribution panel is as follows:the current carrying capacity of the conductor meets the overload protection of protective electrical appliances,while the verification requirements for short‑circuit thermal stability can be ignored.

    Key words：civil buildings;low‑voltage distribution;short‑circuit;cable;current‑carrying capacity;thermal stability verification;molded‑case circuit breaker;overload protection

  摘　要：针对民用建筑中最常见的低压配电系统设计，通过对最不利情况的电缆短路热稳定校验分析和保护电器的限流特性，推论低压配电屏馈电回路电缆规格的设计选择通常是以导体的载流量满足保护电器过负荷保护为主要决定因素，而可忽略其短路热稳定的校验要求。

  关键词：民用建筑；低压配电；短路；电缆；载流量；热稳定校验； 塑壳断路器；过负荷保护

  中图分类号：TM247   　　　　   文献标识码：A

    doi：10.3969 / j. issn.1003 － 8493.2020.12.013