Study on lightning risk assessment and early warning for UHV DC transmission channel

Gu, Shanqiang; Wang, Jian; Wu, Min; Juntian, Guo; Zhao, Chun; Li, Jian

doi:10.1049/hve.2018.5081

Cited by 25 publications

(11 citation statements)

References 13 publications

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“…High‐voltage direct‐current (HVDC) cable plays an important role in long‐distance power transmission, cross‐sea power transmission, and grid connection of renewable energy [1, 2]. A semi‐conductive shielding layer, as an indispensible part of high‐voltage cables, can make the conductor and insulation layer closely connected, and ensure a uniform electric field.…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature on electric‐thermal properties of semi‐conductive shielding layer and insulation layer for high‐voltage cable

Wei

Liu

et al. 2021

High Voltage

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A semi-conductive shielding layer plays an important role in the uniform electric field for a high-voltage cable. The electric-thermal properties of the semi-conductive layer and insulation layer directly affect the overall insulation performance of the cable. The physicochemical performances of semi-conductive composites are firstly analysed herein. Furthermore, electric-thermal properties of the semi-conductive layer and insulation layer are discussed. The experimental results show that the thermal conductivity of the commercial semi-conductive layer is about twice that of the insulation layer, owing to the effect of carbon black. The thermal expansion coefficient of the insulation layer rises from 1.86 � 10 −4 /K at 25°C to 3.20 � 10 −4 /K at 90°C. By contrast, the semiconductive layer begins to slowly decline at a certain temperature, and decreases significantly to 2.25 � 10 −4 /K at 80°C, owing to the effect of ethylene-vinyl acetate copolymer (EVA). The electrical experiments show that the resistivity of semi-conductive composite gradually rises with an increase in temperature, and gradually declines with an increase in the carbon black content. The dc breakdown strength of the composite structure of the semi-conductive layer/insulation layer decreases significantly with an increase in temperature, decreasing from 307 kV/mm at 25°C to 203 kV/mm at 90°C. At four typical temperatures, the breakdown strength reaches the maximum value when the carbon black content is 25 phr. It is about 15% and 19% higher than carbon black contents of 20 and 30 phr. These findings have reference significance for high-voltage cable breakdown fault analysis and material selection in cable design. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Section: Introductionmentioning

confidence: 99%

Effect of temperature on electric‐thermal properties of semi‐conductive shielding layer and insulation layer for high‐voltage cable

Wei

Liu

et al. 2021

High Voltage

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show abstract

“…High-voltage direct current (HVDC) cable as the key equipment of constructing dc power grid has been widely used in underwater power and city power [1][2][3][4][5]. The insulation layer and semiconductive layer are the most important parts of dc cable.…”

Section: Introductionmentioning

confidence: 99%

“…5 Iss. 1, pp [1][2][3][4][5][6]. This is an open access article published by the IET and CEPRI under the Creative Commons Attribution -NonCommercial License (http://creativecommons.org/licenses/by-nc/3.0/) 1…”

mentioning

confidence: 99%

Research progress of semiconductive shielding layer of HVDC cable

Wei

Wang

et al. 2020

High Voltage

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As an indispensable part of high-voltage direct current (HVDC) cable, the semiconductive shielding layer plays the role of uniforming electric field in the cable. However, cable shielding materials >35 kV mainly rely on foreign imports in China, which belongs to the technical weak issues in the field of electrical materials. At present, there are few systematic reports on semiconductive shielding material of HVDC cable. In the work, the mechanisms of charge conduction and thermal conduction of semiconductive material have been introduced. Effect of raw material, carbon black content and the second conductive filler on the resistance characteristics of the semiconductive layer, the charge accumulation characteristics of the insulating layer and the interface characteristics have been studied. A kind of semiconductive layer as a high voltage terminal charge emission method has been proposed to study charge emission from the semiconducting layer to the insulation layer. This work can provide theoretical guidance for the research of semiconductive shielding materials.

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“…But the existing approaches cannot accurately monitor the safety margin of tower, which brings great inconvenience to grid corporations. This paper aims to address such challenge by accurately monitoring and judging safety of transmission line tower in real time, so that the State Grid Corporation can make correct emergency decisions [2]- [4].…”

Section: Introductionmentioning

confidence: 99%

Short-Term Failure Warning for Transmission Tower Under Land Subsidence Condition

et al. 2020

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Crustal movement and land subsidence will cause tower foundation settlement, which seriously affects the safety of transmission line operation. This paper proposed a short-term failure warning method for transmission tower under land subsidence condition based on finite element method, strain monitoring and time series prediction. By simulating the stress distribution of the tower in actual foundation settlement, the weak components of the settlement tower were founded. Combined with the finite element simulation results in various conditions, the reliability of simulation results is verified, and the strain variation range of the corresponding measuring point is obtained. By installing the real-time strain monitoring system and establishing the autoregressive integrated moving average (ARIMA) time series forecast model, warning of the failure of the tower can be sounded in short time according to the strain monitoring and forecasting results. The field results show that the tower is in good condition and with no risk in short term. The method proposed by this paper is economical and easy to operate, which can be used to conduct the emergency treatment of the dangerous tower under land subsidence condition. INDEX TERMS FEM, land subsidence, strain monitoring, time series forecast, tower failure warning.

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Study on lightning risk assessment and early warning for UHV DC transmission channel

Cited by 25 publications

References 13 publications

Effect of temperature on electric‐thermal properties of semi‐conductive shielding layer and insulation layer for high‐voltage cable

Effect of temperature on electric‐thermal properties of semi‐conductive shielding layer and insulation layer for high‐voltage cable

Research progress of semiconductive shielding layer of HVDC cable

Short-Term Failure Warning for Transmission Tower Under Land Subsidence Condition

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