Results 11 to 20 of about 28,176 (317)

Effects of short-time voltage drops and polarity reversals on breakdown behaviour of cross-linked polyethylene

11th International Symposium on High-Voltage Engineering (ISH 99), 1999
This paper deals with breakdown voltage characteristics of cross-linked polyethylene (XLPE) in homogeneous electric fields. The breakdown behaviour is measured with foils in a sphere-sphere arrangement under the influence of short-time voltage drops. The influence both of fall time and of rise time of dc recovery voltage is discussed in connection with
Uwe Riechert
openalex   +3 more sources

Creepage Breakdown Characteristics of Oil-immersed Insulation for DC and Polarity Reversal Voltages

IEEJ Transactions on Power and Energy, 1999
Masami Ikeda, S. Motegi, Yasuhiko Taniguchi, Yoshio Yoshida, Yoshihiko Nakagoshi, Masayuki Hatano   +5 more
openalex   +3 more sources

Correlation of traps inside XLPE and polypropylene with space charge dynamics under polarity reversal condition

IET Science, Measurement & Technology, 2021
Polypropylene (PP) is being considered as a suitable alternative to the cross‐linked polyethylene (XLPE) insulation as the latter is prone to the space charge accumulation when subjected to the voltage polarity reversals in line‐commutated converter high
Ashish Paramane, Xiangrong Chen, Chao Dai, Yasuhiro Tanaka   +3 more
doaj   +1 more source

Research on the dynamic characteristics of electric field distribution of the ± 1100 kV Ultra high voltage converter transformer valve‐side bushing using weakly ionised gas conductance model

High Voltage, 2022
Ultra high voltage (UHV) converter transformer valve‐side bushings are the key equipment indirect current (DC) transmission projects, and are subjected to high voltage and large current with large number of harmonics simultaneously.
Qingyu Wang, Peng Liu, Huidong Tian, Gengsheng Xie, Zongren Peng, Xi Yang   +5 more
doaj   +1 more source

A Study of Fast Front Transients of an HVDC Mixed Transmission Line Exposed to Bipolar Lightning Strokes

Energies, 2021
Bipolar lightning strokes are associated with multiple polarity electrical discharge with no current intervals in between, making their behavior quite peculiar.
Ayesha Shakeel, Kyu-Hoon Park, Koo-Yong Shin, Bang-wook Lee   +3 more
doaj   +1 more source

Influence of Polarity Reversal Period and Temperature Gradient on Space Charge Evolution and Electric Field Distribution in HVDC Extruded Cable

Energies, 2022
During the operation of HVDC extruded cables, voltage polarity reversal (VPR) is considered one of the most severe conditions for cable insulation.
Yifan Zhou, Bo Gao, Wei Wang, Ke Song
doaj   +1 more source

Modelling of insulation in DC systems: the challenges for HVDC cables and accessories

Vietnam Journal of Science, Technology and Engineering, 2022
Cable technologies have evolved in different ways for applications using high voltage alternating current (HVAC) and high voltage direct current (HVDC) over the last 40 years.
Vu Thi Thu Nga, Gilbert Teyssedre
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Numerical Analysis of Space Charge Behavior and Transient Electric Field under Polarity Reversal of HVDC Extruded Cable

Energies, 2020
The superimposed transient electric field generated by polarity reversal causes severe stress to the high-voltage direct current (HVDC) cable insulation.
Sun-Jin Kim, Bang-Wook Lee
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Partial discharge behavior under operational and anomalous conditions in HVDC systems [PDF]

, 2017
Power cables undergo various types of overstressing conditions during their operation that influence the integrity of their insulation systems. This causes accelerated ageing and might lead to their premature failure in severe cases.
Azizian Fard, M., Farrag, M. Emad, McMeekin, S.G., Reid, A.J.   +3 more
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Designing HVDC GIS/GIL spacer to suppress charge accumulation

High Voltage, 2022
To suppress the charge accumulation on the spacer surface in direct current (DC) gas insulated transmission line (GIL) is an important and emergent issue for the development of a clean, safe and economic smart grid.
Zuodong Liang, Chuanjie Lin, Fangwei Liang, Weijian Zhuang, Yujia Xu, Lingling Tang, Yulin Zeng, Jun Hu, Bo Zhang, Chuanyang Li, Jinliang He   +10 more
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