Partial Discharge Simulation of Air Gap Defects in Oil-Paper Insulation Paperboard of Converter Transformer under Different Ratios of AC–DC Combined Voltage

A converter transformer is important primary equipment in a DC transmission project. The voltage on the valve side winding is complex when the equipment is running, including DC, AC, and AC–DC combined voltage. The insulation structure of the valve side winding of a converter transformer is an oil-p...

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Autores principales:	Bing Luo, Jian Wang, Dong Dai, Lei Jia, Licheng Li, Tingting Wang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	partial discharge combined voltage space charge surface charge density Technology T
Acceso en línea:	https://doaj.org/article/ee598b11ac334696b20d0ced17122361
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spelling	oai:doaj.org-article:ee598b11ac334696b20d0ced171223612021-11-11T15:48:46ZPartial Discharge Simulation of Air Gap Defects in Oil-Paper Insulation Paperboard of Converter Transformer under Different Ratios of AC–DC Combined Voltage10.3390/en142169951996-1073https://doaj.org/article/ee598b11ac334696b20d0ced171223612021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/6995https://doaj.org/toc/1996-1073A converter transformer is important primary equipment in a DC transmission project. The voltage on the valve side winding is complex when the equipment is running, including DC, AC, and AC–DC combined voltage. The insulation structure of the valve side winding of a converter transformer is an oil-paper insulation structure, which may have a variety of defects in the manufacturing stage and daily use, resulting in partial discharge. Therefore, it is the key to studying the partial discharge characteristics and mechanism of oil-paper insulation under AC–DC combined voltage. In this paper, we build a two-dimensional air gap model of oil-paper-insulated pressboard considering the actual particles and actual reaction based on the fluid model. The characteristics and evolution mechanism of partial discharge (PD) in pressboard under different AC/DC combined voltages are studied by numerical simulation. The results show that when the DC component increases, the polarity effect of partial discharge is more obvious, while the potential and discharge intensity in the air gap decrease. Further analysis revealed that the DC component in the combined voltage accumulated a large number of surface charges on the surface of the air gap, and the space charge distribution was more uniform and dispersed, which generated an electric field with opposite polarity to the DC component in the air gap and, then, inhibited the development of local discharge in the paperboard. The results of the simulation are consistent with the previous experimental phenomena, and the mechanism analysis of the simulation results also verifies the previous analysis on the mechanism of experimental phenomena. This will lay a theoretical foundation for the further study of partial discharge phenomenon of oil-paper insulation structures in practical operation in the future.Bing LuoJian WangDong DaiLei JiaLicheng LiTingting WangMDPI AGarticlepartial dischargecombined voltagespace chargesurface charge densityTechnologyTENEnergies, Vol 14, Iss 6995, p 6995 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	partial discharge combined voltage space charge surface charge density Technology T
spellingShingle	partial discharge combined voltage space charge surface charge density Technology T Bing Luo Jian Wang Dong Dai Lei Jia Licheng Li Tingting Wang Partial Discharge Simulation of Air Gap Defects in Oil-Paper Insulation Paperboard of Converter Transformer under Different Ratios of AC–DC Combined Voltage
description	A converter transformer is important primary equipment in a DC transmission project. The voltage on the valve side winding is complex when the equipment is running, including DC, AC, and AC–DC combined voltage. The insulation structure of the valve side winding of a converter transformer is an oil-paper insulation structure, which may have a variety of defects in the manufacturing stage and daily use, resulting in partial discharge. Therefore, it is the key to studying the partial discharge characteristics and mechanism of oil-paper insulation under AC–DC combined voltage. In this paper, we build a two-dimensional air gap model of oil-paper-insulated pressboard considering the actual particles and actual reaction based on the fluid model. The characteristics and evolution mechanism of partial discharge (PD) in pressboard under different AC/DC combined voltages are studied by numerical simulation. The results show that when the DC component increases, the polarity effect of partial discharge is more obvious, while the potential and discharge intensity in the air gap decrease. Further analysis revealed that the DC component in the combined voltage accumulated a large number of surface charges on the surface of the air gap, and the space charge distribution was more uniform and dispersed, which generated an electric field with opposite polarity to the DC component in the air gap and, then, inhibited the development of local discharge in the paperboard. The results of the simulation are consistent with the previous experimental phenomena, and the mechanism analysis of the simulation results also verifies the previous analysis on the mechanism of experimental phenomena. This will lay a theoretical foundation for the further study of partial discharge phenomenon of oil-paper insulation structures in practical operation in the future.
format	article
author	Bing Luo Jian Wang Dong Dai Lei Jia Licheng Li Tingting Wang
author_facet	Bing Luo Jian Wang Dong Dai Lei Jia Licheng Li Tingting Wang
author_sort	Bing Luo
title	Partial Discharge Simulation of Air Gap Defects in Oil-Paper Insulation Paperboard of Converter Transformer under Different Ratios of AC–DC Combined Voltage
title_short	Partial Discharge Simulation of Air Gap Defects in Oil-Paper Insulation Paperboard of Converter Transformer under Different Ratios of AC–DC Combined Voltage
title_full	Partial Discharge Simulation of Air Gap Defects in Oil-Paper Insulation Paperboard of Converter Transformer under Different Ratios of AC–DC Combined Voltage
title_fullStr	Partial Discharge Simulation of Air Gap Defects in Oil-Paper Insulation Paperboard of Converter Transformer under Different Ratios of AC–DC Combined Voltage
title_full_unstemmed	Partial Discharge Simulation of Air Gap Defects in Oil-Paper Insulation Paperboard of Converter Transformer under Different Ratios of AC–DC Combined Voltage
title_sort	partial discharge simulation of air gap defects in oil-paper insulation paperboard of converter transformer under different ratios of ac–dc combined voltage
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/ee598b11ac334696b20d0ced17122361
work_keys_str_mv	AT bingluo partialdischargesimulationofairgapdefectsinoilpaperinsulationpaperboardofconvertertransformerunderdifferentratiosofacdccombinedvoltage AT jianwang partialdischargesimulationofairgapdefectsinoilpaperinsulationpaperboardofconvertertransformerunderdifferentratiosofacdccombinedvoltage AT dongdai partialdischargesimulationofairgapdefectsinoilpaperinsulationpaperboardofconvertertransformerunderdifferentratiosofacdccombinedvoltage AT leijia partialdischargesimulationofairgapdefectsinoilpaperinsulationpaperboardofconvertertransformerunderdifferentratiosofacdccombinedvoltage AT lichengli partialdischargesimulationofairgapdefectsinoilpaperinsulationpaperboardofconvertertransformerunderdifferentratiosofacdccombinedvoltage AT tingtingwang partialdischargesimulationofairgapdefectsinoilpaperinsulationpaperboardofconvertertransformerunderdifferentratiosofacdccombinedvoltage
_version_	1718433865824993280

Partial Discharge Simulation of Air Gap Defects in Oil-Paper Insulation Paperboard of Converter Transformer under Different Ratios of AC–DC Combined Voltage

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