【摘要】 分析了低压６６０Ｖ供电较３８０Ｖ供电的优越性，如提高了线路的输电能力；在电缆长度和截面不变的情况下，其输送功率扩大３倍；在输送功率不变，电缆不变的条件下，６６０Ｖ线路上的功率损耗是３８０Ｖ的１／３；改善供电系统的短路保护，提高了供电质量。该措施已在煤炭工业中全面实施，如推广到其他工矿企业，将会产生巨大的经济效益。更多还原

【Abstract】 It is analyzed that low voltage 660V power supply has superiorities over that of 380V, such as high power transmission ability, low loss of power and improvement of protection and power quality. The method has been adopted in coal mine industry and it will have brought great economic benefit when it is extended to other industries.更多还原