Improve the insulation performance of air-insulated gaps: Application of polyurea materials on the ground potential side of transmission line

IF 4.4 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
High Voltage Pub Date : 2024-11-17 DOI:10.1049/hve2.12490
Le Li, Huajie Shen, Zhongyuan Zhang, Shijie Xu, Yifan Liu, Haishun Zhang, Li Tang, Honggang Peng, Fan Wang, Guangxi Li, Haoyi Li, Yunpeng Liu
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Abstract

The authors aim to explore the effectiveness of two-component polyurea materials applied to transmission line towers (on the ground potential side) in improving the insulation performance of the conductor–tower gap. The physicochemical and electrical properties of the polyurea materials were first analysed and a conductor–tower gap testing platform was constructed to investigate the effects of the length and thickness of the polyurea layer on the ground potential side under a 50-Hz AC voltage on the breakdown characteristics. Experimental studies revealed that the characteristic breakdown voltages of polyurea layers of different lengths (40, 100, 200, and 400 cm) are approximate. Compared with the air-insulated gap before the application of polyurea, thinner polyurea layers (1 and 2 mm) showed no significant improvement in the breakdown voltage, whereas thicker layers (3, 4, and 5 mm) significantly improved it. In particular, with a polyurea layer thickness of 4 mm and gap distance of 20 cm, the characteristic breakdown voltage increased from 138.43 to 155.71 kV. In addition, the withstand voltage distance decreased from 4 to 3 cm without any breakdown, even when the high-voltage conductor directly contacted the polyurea layer and the layer was not penetrated. The authors provide theoretical support and experimental data for improving the conductor–tower gap insulation performance by applying a polyurea layer on the ground potential side.

Abstract Image

提高气绝缘间隙的绝缘性能:聚脲材料在输电线路地电位侧的应用
作者的目的是探讨双组份聚脲材料应用于输电线路塔(地电位侧)在改善导体-塔间隙绝缘性能方面的有效性。首先分析了聚脲材料的物理化学和电学性能,并搭建了导体-塔隙测试平台,研究了50 hz交流电压下地电位侧聚脲层的长度和厚度对击穿特性的影响。实验研究表明,不同长度(40、100、200和400 cm)的聚脲层的特征击穿电压是近似的。与应用聚脲之前的空气绝缘间隙相比,较薄的聚脲层(1和2 mm)对击穿电压没有显著改善,而较厚的聚脲层(3、4和5 mm)对击穿电压有显著改善。特别是当聚脲层厚度为4 mm,间隙距离为20 cm时,特征击穿电压从138.43 kV增加到155.71 kV。此外,即使高压导体直接接触聚脲层而聚脲层未被击穿,其耐压距离也从4 cm减小到3 cm而没有击穿。为在地电位侧应用聚脲层提高导体-塔间隙绝缘性能提供了理论支持和实验数据。
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来源期刊
High Voltage
High Voltage Energy-Energy Engineering and Power Technology
CiteScore
9.60
自引率
27.30%
发文量
97
审稿时长
21 weeks
期刊介绍: High Voltage aims to attract original research papers and review articles. The scope covers high-voltage power engineering and high voltage applications, including experimental, computational (including simulation and modelling) and theoretical studies, which include: Electrical Insulation ● Outdoor, indoor, solid, liquid and gas insulation ● Transient voltages and overvoltage protection ● Nano-dielectrics and new insulation materials ● Condition monitoring and maintenance Discharge and plasmas, pulsed power ● Electrical discharge, plasma generation and applications ● Interactions of plasma with surfaces ● Pulsed power science and technology High-field effects ● Computation, measurements of Intensive Electromagnetic Field ● Electromagnetic compatibility ● Biomedical effects ● Environmental effects and protection High Voltage Engineering ● Design problems, testing and measuring techniques ● Equipment development and asset management ● Smart Grid, live line working ● AC/DC power electronics ● UHV power transmission Special Issues. Call for papers: Interface Charging Phenomena for Dielectric Materials - https://digital-library.theiet.org/files/HVE_CFP_ICP.pdf Emerging Materials For High Voltage Applications - https://digital-library.theiet.org/files/HVE_CFP_EMHVA.pdf
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