变压器绕组变形综合判断及实例分析  

Comprehensive judgment of Transformer Winding Deformation and Case Analysis

作　　者：周帆 陈欣 代正元 张庆 浦通 鲁强 Zhou Fan;ChenXing;Dai Zhengyuan;Zhang Qing;Pu Tong;Lu Qiang(Kunming Power Supply Bureau of Yunnan Power Grid Corporation Kunming,650011,China)

机构地区：[1]云南电网有限责任公司昆明供电局,云南昆明650011

出　　处：《云南电力技术》2022年第4期5-8,共4页Yunnan Electric Power

摘　　要：通过对状态评价异常的变压器进行停电试验,发现了多台变压器绕组变形缺陷,为变压器的综合状态评价及绝缘电阻初判绕组异常问题提供了诊断实例。试验检修人员首先根据变压器绝缘电阻异常下降问题,综合分析油色谱情况,初步诊断其为内部绕组问题。之后根据变压器短路阻抗试验、频响法试验及绕组电容量综合分析,推断出绕组发生了严重变形的情况。结合主变历年运行情况及遭受短路冲击次数,综合判断分析了绕组变形原因。通过解体分析,发现了了变压器绕组均存在不同程度的变形,验证了试验和诊断结果。通过预防性试验,提前发现并避免了多起变压器潜伏性故障的发生,并给出了变压器绕组变形的综合判断方法,对变压器的运维有一定的意义。Through the power outage test of the transformer with abnormal state evaluation,several transformer winding deformation defects are found,which provides a diagnostic example for transformer comprehensive state evaluation and abnormal insulation resistance primary judgment winding.Test maintenance personnel first according to the transformer insulation resistance abnormal drop problem,comprehensive analysis of oil chromatography,preliminary diagnosis of its internal winding problem.After that,according to transformer short circuit impedance test,frequency response test and winding capacitance comprehensive analysis,it is inferred that the winding has serious deformation.Combined with the operation of the main transformer over the years and The Times of short-circuit impact,the cause of winding deformation is analyzed comprehensively.Through disassembly analysis,it is found that the transformer windings have different degrees of deformation,which verifies the test and diagnosis results.Through the preventive test,many transformer latent faults are found and avoided in advance,and the comprehensive judgment method of transformer winding deformation is given,which has certain significance for transformer operation and maintenance.

关 键 词：变压器绕组变形 绕组电容量 短路冲击 短路电动力 

分 类 号：TM74[电气工程—电力系统及自动化]