Experiment on Vibro-Acoustic Characteristic of 500kV Single-Phase Transformer under DC-Bias

被引：0

作者：

Li B. ^{[1
,2
]}

Wang Z. ^{[1
]}

Liu H. ^{[3
]}

Li H. ^{[3
]}

Liu J. ^{[2
]}

机构：

[1] Beijing Key Laboratory of High Voltage & EMC, North China Electric Power University, Beijing

[2] State Key Laboratory of Power Grid Environmental Protection, China Electric Power Research Institute, Wuhan

[3] State Grid East Inner Mongolia Electric Power Company, Hohhot

来源：

Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2021年 / 36卷 / 13期

关键词：

DC-bias; Large capacity transformer; Load experiment; Vibro-acoustic noise;

D O I：

10.19595/j.cnki.1000-6753.tces.200689

中图分类号：

学科分类号：

摘要：

DC bias is an abnormal working state of transformer. The main effect of a DC current flowing into a transformer winding is the half-cycle magnetic core saturation, as a result, a series of problems occur, such as the serious distortion of excitation current, partial overheating and increase of vibro-acoustic noise. The big capacity single-phase autotransformer has less tolerance to the DC bias current, which have a serious threat to the safe and stable operation of the power grid. In this paper, two identical 250MV•A/500kV transformers are used for DCbias experiments with and without load. The voltage distortion rate, excitation current, vibration and noise under DC bias of the transformer are measured, and the variation, distribution and harmonics spectrum characteristics under DC bias are analyzed. The test results would provide a reference for the assessment of DC endurance capability and the study of vibro-acoustic noise characteristics of large capacity transformers in actual operation. © 2021, Electrical Technology Press Co. Ltd. All right reserved.

引用

页码：2801 / 2811

页数：10

共 25 条

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