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http://dx.doi.org/10.4313/JKEM.2022.35.4.6

Design and Fabrication of an Electronic Voltage Transformer (EVT) Embedded in a Spacer of Gas Insulated Switchgears  

Lim, Seung-Hyun (Department of Electrical and Electronics Engineering, Korea Maritime and Ocean University)
Kim, Nam-Hoon (Department of Electrical and Electronics Engineering, Korea Maritime and Ocean University)
Kim, Dong-Eon (Department of Electrical and Electronics Engineering, Korea Maritime and Ocean University)
Kim, Seon-Gyu (Department of Electrical and Electronics Engineering, Korea Maritime and Ocean University)
Kil, Gyung-Suk (Department of Electrical and Electronics Engineering, Korea Maritime and Ocean University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.35, no.4, 2022 , pp. 353-358 More about this Journal
Abstract
Bulky iron-core potential transformers (PT) are installed in a tank of gas insulated switchgears (GIS) for a system voltage measurement in power substations. In this paper, we studied an electronic voltage transformer (EVT) embedded in a spacer for miniaturization, eco-friendliness, and performance improvement of GIS. The prototype EVT consists of a capacitive probe (CP) that can be embedded in a spacer and a voltage Follower with a high input and a low output impedance. The CP was fabricated in the form of a Flexible-PCB to acquire the insulation performance and to withstand vibration and shock during operation. Voltage ratio of the prototype EVT is about 42,270, and the frequency bandwidth of -3 dB ranges from 0.33 Hz to 3.9 MHz. The voltage ratio error evaluated at about 6%, 12% and 18% of the rated voltage of 170 kV was 0.32%, and the phase error was 12.9 minutes. These results were within the accuracy for the class 0.5 specified in IEC 60044-7 and satisfy even in ranges from 80% to 120% of the rated voltage. If the prototype EVT replaces the conventional iron-core potential transformer, it is expected that the height of the GIS could be reduced by 11% and the amount of SF6 will be reduced by at least 10%.
Keywords
Potential transformers (PT); Gas insulated switchgears (GIS); Spacer; Electronic voltage transformer (EVT); Capaci-tive probe (CP);
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