Fault Diagnose Technology of Transformers Based on Inductive Oscillating Switching Impulse Voltage Withstand Test

被引：0
|
作者：
Zhang Z. [1 ]
Jin Y. [1 ]
Wu B. [1 ]
Pang P. [1 ]
Li J. [1 ]
Yang X. [2 ]
机构：
[1] School of Electrical Engineering, Xi'an Jiaotong University, Xi'an
[2] Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou
来源：
Gaodianya Jishu/High Voltage Engineering | 2019年 / 45卷 / 02期
基金：
国家重点研发计划;
关键词：
Fault diagnosis; Impulse voltage generator; Inducting oscillating switching impulse voltage withstand test; Insulation fault; Transformer; Winding deformation;
D O I：
10.13336/j.1003-6520.hve.20190130027
中图分类号：
学科分类号：
摘要：
At present, there are few deeply researches on adopting oscillating switching impulse (OSI) voltage withstand test on transformers and on diagnosing by multiply methods. Consequently, we experimentally investigated the inductive OSI voltage withstand on a 220 kV three-phase oil immersed transformer before and after the short-circuit impact tests. Voltage waveforms on high-voltage windings and low-voltage windings, neutral point indication current, partial discharge (PD) signal and voltage transfer function were analyzed comprehensively and compared with the teardown results of a transformer to research how the mechanical and insulation defects affect these characteristics. The results show that the voltage waveforms, neutral point indication current and voltage transfer function can detect both mechanical and insulation defects, while the PD signal can only reflects insulation defects. The effect of mechanical defects on the characteristics will occur at a low test voltage level while the effect of insulation defects will occur at a high test voltage level. Transfer function and PD signal are more sensitive to defects while voltage waveform and neutral point indication current could locate the defective wingdings. The study verifies that the application of inductive OSI voltage withstand test on transformer fault diagnosis is feasible and effective. The results also show that this diagnosis method can detect mechanical faults and insulation faults in transformers. © 2019, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：549 / 556
页数：7
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