电器与能效管理技术 ›› 2022, Vol. 0 ›› Issue (7): 1-6.doi: 10.16628/j.cnki.2095-8188.2022.07.001

• 研究与分析 •    下一篇

中压变压器保护用熔断器小电流熔断特性的试验研究

郑嘉禧1, 王国庆1, 林博勇1, 刘春2, 刘浔2, 臧春艳2   

  1. 1.南方电网 广州供电局有限公司, 广东 广州 510620
    2.华中科技大学 强电磁工程与新技术国家重点实验室, 湖北 武汉 430074
  • 收稿日期:2022-02-28 出版日期:2022-07-30 发布日期:2022-09-16
  • 作者简介:郑嘉禧(1993—),女,助理工程师,主要从事配电网规划。|王国庆(1986—),男,工程师,主要从事配电网智能运维检修。|林博勇(1994—),男,助理工程师,主要从事配网设备高效运检体系研究。
  • 基金资助:
    南方电网公司项目(GZHKJXM20180142)

Experimental Study on Low Current Fusing Characteristics of Fuse for Medium Voltage Transformer Protection

ZHENG Jiaxi1, WANG Guoqing1, LIN Boyong1, LIU Chun2, LIU Xun2, ZANG Chunyan2   

  1. 1. Guangzhou Power Supply Company,China Southern Power Grid Co.,Ltd., Guangzhou 510620, China
    2. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
  • Received:2022-02-28 Online:2022-07-30 Published:2022-09-16

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1.3In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1.0In、1.25In、1.4In、1.6In、2.0In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0.1In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。

关键词: 中压熔断器, 熔体, 熔断特性, 约定不熔化电流

Abstract:

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 1.3In,the fuse is not allowed to melt. A large number of temperature rise characteristic tests under 1.0In,1.25In,1.4In,1.6In and 2.0In 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 0.1In is about 16 mΩ and 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.

Key words: medium voltage fuse, melt, fusing characteristics, agreed non melting current

中图分类号: