赵时昌 金   超 李凡龙（云南省设计院集团有限公司，昆明市 650228）

Discussion on Long Distance Power Supply for ELV Equipment

ZHAO Shichang JIN Chao LI Fanlong

(Yunnan Design Institute Group Co.,Ltd.,Kunming 650228，China)

Abstract：Given the problem that it is difficult to obtain power from ELV equipment far away from the power supply point and the long power supply distance,combined with the actual voltage input demand of DC power supply in the wide voltage input range,the range of voltage drop required by relevant codes,and under the premise of meeting the requirements for earth fault protection,short circuit protection,etc.,calculations and analyses are made to put forward the viewpoints on the distance of low‑voltage power supply of ELV equipment in faraway places.

Key words：DC power supply in the wide voltage input range;voltage loss;earth fault protection;short circuit protection;power supply distance;thermal stability calibration;security equipment;DC power supply

摘　要：针对离电源点较远的弱电设备取电较难、供电距离较长的问题，结合宽电压输入范围直流电源的实际电压输入需求、规范要求的电压降范围，在满足接地故障保护、短路保护等要求的前提下，进行计算和分析，提出远距离场所弱电设备低压供电距离的观点。

关键词：宽电压输入范围直流电源；电压损失；接地故障保护；短路保护；供电距离；热稳定校验；安防设备；直流电源

中图分类号：TU852                　  文献标识码：A

doi：10.3969 / j. issn.1003 － 8493.2024.06.003