Non-contact measurement of transient voltage in transformer type windings with coupling capacitive sensors

被引：0
|
作者：
Ni H. [1 ]
Wang T. [1 ]
Yuan W. [1 ]
Xu J. [2 ]
Zang Y. [2 ]
Du J. [2 ]
Zhang Q. [1 ]
机构：
[1] State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an, 710049, Shaanxi Province
[2] Shandong Power Equipment Co. Ltd., Jinan, 250022, Shandong Province
来源：
| 1600年 / Power System Technology Press卷 / 40期
关键词：
Coupling capacitive sensor; Cut-off frequency; Measurement of transient overvoltage; Transformer type windings; Voltage distribution characteristics;
D O I：
10.13335/j.1000-3673.pst.2016.12.041
中图分类号：
学科分类号：
摘要：
Experimental investigations of voltage distribution characteristics are the most important references to transformer winding insulation structure design. To overcome some disadvantages of classical methods, such as direct measurement and optical fiber measurement, this paper presented a new method based on coupling capacitive sensors for measuring transient voltage in transformer type windings. Operating principle and calibration method were presented. Impedance converter and RC integrator were utilized to improve system response characteristics, making frequency band range from 0.64 Hz to 106 MHz. Coupling effect was eliminated by decoupling original data. Experiments were carried out using this system to study transient process of low voltage winding in a UHV power transformer with different impulse waveforms applied and effects of waveform parameters were analyzed. Results showed that peak voltages of the first few winding discs would be larger than entrance voltage because of resonance while lightning impulse was applied, and peak voltage distribution would be an exponential decay curve while high-frequency oscillated waves or steep front waves were applied. © 2016, Power System Technology Press. All right reserved.
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页码：3930 / 3937
页数：7
相关论文
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