直流电阻测试对变压器导电回路缺陷的有效性分析
杨新春，罗杨，蔡川，邱炜，黄昆，高纪新
（国网成都供电公司，四川 成都 610041）
摘 要：直流电阻测试对发现主变压器绕组缺陷具有重要作用。基于实际案列，分析了直流电阻在发现主变绕组缺陷的有效性，指出其对发现套管将军帽松动、有载分接开关压接不牢、极性开关内部接触不良等具有明显效果，但对于因绝缘击穿导致的断股类缺陷，只要引线烧损等效截面积所占整体比例不大，则不能反映真实缺陷，只有结合油色谱、运行工况、保护动作等才能有效判断故障类型。
关键词：主变压器；绕组；直流电阻；缺陷
中图分类号：TM406 文献标识码：B 文章编号：1007-3175(2018)04-0048-05
Efficiency Analysis of Direct Current Resistance of Coil Winding to Diagnose Power Transformer Defects
YANG Xin-chun, LUO Yang, CAI Chuan, QIU Wei, HUANG Kun, GAO Ji-xin
（State Grid Chengdu Power Supply Company, Chengdu 610041, China）
Abstract: The direct current (DC) resistance test plays an important part in finding the defects of coil winding in main transformer. Based on some practical examples, this paper analyzed the effectiveness of coil winding defects discovered by the DC resistance test, which was very helpful to the typical defects of transforms, such as flaws on transformer bushing coupler, loose compression splice of on-load tap-changer, bad contact inside polarity switch, poor connection of welding joint, and so on, but for the lines breaking defects caused by insulation breakdown, the real defects couldn’t be reflected as long as the sectional area equivalent to lead burning loss was less percent of the entirety. The only way to effectively judge the fault type is to combine the DC resistance test with oil chromatography, operational states and protective action etc.
Key words: main transformer; coil winding; direct current resistance; defect
参考文献
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