10kV油浸式配电变压器过电流温升试验案例研究  

A Case Study on Overcurrent and Temperature Rise Testing of 10kV Oil-Immersed Distribution Transformers

作　　者：高勇 王杰 毛雅茹 郑友卓 GAO Yong;WANG Jie;MAO Yaru;ZHENG Youzhuo(Electric Power Scientific Research Institute of Guizhou Power Grid Co.,Ltd.,Guiyang 550002,Guizhou,China;Shaoguan Power Supply Bureau,Guangdong Power Grid Co.,Ltd.,Shaoguan 5120000,Guangdong,China;Liupanshui Power Supply Bureau,Guizhou Power Grid Co.,Ltd.,Liupanshui 553000,Guizhou,China)

机构地区：[1]贵州电网有限责任公司电力科学研究院,贵州贵阳550002 [2]广东电网有限责任公司韶关供电局,广东韶关5120000 [3]贵州电网有限责任公司六盘水供电局,贵州六盘水553000

出　　处：《电力大数据》2023年第11期61-69,共9页Power Systems and Big Data

摘　　要：季节性人口流动导致用电负荷短期增加,引发10kV油浸式配电变压器过载运行甚至烧毁等故障,从而引发客户投诉问题。本文结合贵州区域内配变过载情况,综合考虑配变过载能力、影响过载能力的因素、过载运行导致的风险和绝缘寿命损失,总结出配变过载运行的基本特征,并提出了通过过电流温升试验方法验证其过载能力的思路和方法。通过现场试验验证了该方法的可行性,为快速处理配变过载运行提供依据。根据植物绝缘油具有良好电气性能、高燃点、原料来源广泛和可再生等优势,对使用植物绝缘油替换矿物绝缘油来提升配变过载能力的进行了验证,分析了更换绝缘油前后的负载性能情况,并从短期、中期和长期治理提出了建议。Seasonal population movements lead to short-term increases in electricity demand,causing overload operation and even failure,such as burnout,in 1okV oil-immersed distribution transformers,resulting in customer complaints.This paper,based on the overload situations of distribution transformers in the Guizhou region,comprehensively considers factors affecting overload capacity,risks associated with overload operation,and insulation life losses.It summarizes the fundamental characteristics of overload operation for distribution transformers and proposes an approach and method to verify their overload capacity through overcurrent and temperature rise testing.The feasibility of this method is verified through on-site testing,providing a basis for addressing overload operation issues promptly.Considering the advantages of vegetable-based insulating oil,such as good electrical properties,high flash point,wide availability of raw materials,and renewability,the paper also validates the replacement of mineral insulating oil with vegetable-based insulating oil to enhance overload capacity.Load performance before and after the oil replacement is analyzed,and recommendations are provided for short-term,medium-term,and long-term measures.

关 键 词：配电变压器 重过载运行 温升试验 矿物绝缘油 植物绝缘油 

分 类 号：TM406[电气工程—电器]