摘要
中压变压器保护用熔断器是一种用于配电变压器高压侧的过流保护电器。按照南方电网规定,当约定不熔化电流小于1.3 I_(n)时,不允许发生熔体熔化现象。对国内外10个厂家的中压变压器保护用熔断器崭新样品开展了1.0 I_(n)、1.25 I_(n)、1.4 I_(n)、1.6 I_(n)、2.0 I_(n)电流下温升试验,研究了送检样品在小电流下的熔断特性。在0.1 I_(n)电流下,熔体电阻最大16 mΩ,最小8.3 mΩ。实验发现,送检样品不合格率达到30%。试验结果对中压变压器保护用熔断器的研发、选型、采购、质量评估具有重要参考价值。
The fuse used to protect the medium voltage transformer is an overcurrent protection appliance for the high voltage side of distribution transformer.According to the regulations of China Southern Power Grid,if the conventional non-fusing current is less than 1.3 I_(n),the fuse is not allowed to melt.A large number of temperature rise characteristic tests under 1.0 I_(n),1.25 I_(n),1.4 I_(n),1.6 I_(n)and 2.0 I_(n)current are carried out with the brand-new samples of fuses for protection to medium voltage transformer from 10 manufacturers at home and abroad,and the fusing characteristics under low current are studied.It is shown that the maximum resistance of fuse-element under 0.1 I_(n)is about 16 mΩand the minimum is about 8.3 mΩ.The unqualified rate of the samples submitted for the inspection can reach 30%,which has important reference value for the selection,procurement and quality evaluation of the fuses for the protection of medium voltage transformers.
作者
郑嘉禧
王国庆
林博勇
刘春
刘浔
臧春艳
ZHENG Jiaxi;WANG Guoqing;LIN Boyong;LIU Chun;LIU Xun;ZANG Chunyan(Guangzhou Power Supply Company,China Southern Power Grid Co.,Ltd.,Guangzhou 510620,China;State Key Laboratory of Advanced Electromagnetic Engineering and Technology,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《电器与能效管理技术》
2022年第7期1-6,共6页
Electrical & Energy Management Technology
基金
南方电网公司项目(GZHKJXM20180142)。
关键词
中压熔断器
熔体
熔断特性
约定不熔化电流
medium voltage fuse
melt
fusing characteristics
agreed non melting current
