Estimation of water content in a power transformer using moisture dynamic measurement of its oil

High Voltage

Alireza Majzoobi¹  Vahid Sarfi²  Saeed Mohajeryami³ 

[1] University of Denver;University of Nevada;University of North Carolina at Charlotte;

关键词: transformer oil;    power transformer insulation;    transformer windings;    electric breakdown;    partial discharges;    paper;    moisture measurement;    water content estimation;    power transformer;    moisture dynamic measurement;    high voltage equipment monitoring;    condition-based maintenance;    electrical breakdown;    partial discharge;    sundry minor problems;    paper insulation;    direct moisture measurement;    moisture dynamics analysis;    power grid;   

DOI  :  10.1049/hve.2016.0075

来源: DOAJ

【 摘 要 】

Careful monitoring of high voltage equipments and diagnosing the critical conditions before they lead to a disaster are prerequisites of condition-based maintenance. Moisture content in a transformer is regarded as one of the major factors in diagnosing its conditions. It causes many problems for a power transformer including electrical breakdown between either its windings or one winding with neutral, increase in the amount of partial discharge and sundry minor problems. Since paper insulation of a power transformer carries large portion of water content, determining moisture content in this part of the transformer is essential. However, the problem is that the direct measurement of moisture in paper is impossible. Therefore, various methods have been proposed to measure the moisture content in a transformer but each one has its limitations. In this study, an approach is introduced to measure water content in a transformer by analysing the moisture dynamics in oil, tracking its variations and analysis of parameters such as temperature, without necessity of disconnecting the transformer from the power grid.

【 授权许可】

Unknown