Electrical tree initiation according to the flow pattern in the EHV power cable insulation

2003 ◽  
Author(s):  
Seung-Yop Lee ◽  
Dae-Hee Cho ◽  
Young-Ho Kim ◽  
In-Ho Lee ◽  
Wan-Ki Park
Keyword(s):  
Flow Pattern ◽  
Power Cable ◽  
Cable Insulation ◽  
Electrical Tree

scholarly journals Electrical Treeing in Power Cable Insulation under Harmonics Superimposed on Unfiltered HVDC Voltages

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3113 ◽  
Author(s):  
Mehrtash Azizian Fard ◽  
Mohamed Emad Farrag ◽  
Alistair Reid ◽  
Faris Al-Naemi
Keyword(s):  
Electric Fields ◽  
Direct Current ◽  
Asset Management ◽  
Diagnostic Techniques ◽  
Power Cable ◽  
Operational Parameters ◽  
Cable Insulation ◽  
Electrical Tree ◽  
Double Electrode ◽  
Electrical Trees

Insulation degradation is an irreversible phenomenon that can potentially lead to failure of power cable systems. This paper describes the results of an experimental investigation into the influence of direct current (DC) superimposed with harmonic voltages on both partial discharge (PD) activity and electrical tree (ET) phenomena within polymeric insulations. The test samples were prepared from a high voltage direct current (HVDC) cross linked polyethylene (XLPE) power cable. A double electrode arrangement was employed to produce divergent electric fields within the test samples that could possibly result in formation of electrical trees. The developed ETs were observed via an optical method and, at the same time, the emanating PD pulses were measured using conventional techniques. The results show a tenable relation between ETs, PD activities, and the level of harmonic voltages. An increase in harmonic levels has a marked effect on development of electrical trees as the firing angle increases, which also leads to higher activity of partial discharges. This study of the influencing operational parameters of HVDC converters on power cable insulation is predicted to contribute to enhancements in cable design and progressive advancement in condition monitoring and insulation diagnostic techniques that can lead to more effective asset management in HVDC systems.

Study on the Methodology of Detection for Power Cable Insulation Defects Based on Oscillatory Wave

2013 ◽  
Vol 805-806 ◽  
pp. 880-883
Author(s):  
Yu Sheng Quan ◽  
Dai Juan Wang ◽  
Guang Chen ◽  
Zong Cheng Zhang
Keyword(s):  
Failure Rate ◽  
Partial Discharge ◽  
Reference Database ◽  
Power Cable ◽  
Signal Source ◽  
Cable Insulation ◽  
Water Tree ◽  
Detection Technology ◽  
Electrical Tree

Water tree, electrical tree and electrochemical tree formed by premature defects of the cable can induce fault. The failure rate of the cable connecter which is higher than cable itself can emerge water tree, electrical tree and electrochemical tree. Meanwhile, the flashover, partial discharge and overheated of the cable joint are also the important reasons for fault. The oscillatory wave of detecting the power cable insulation defects based on is put forward in this paper in terms of the problems existed in the cable detection technology. With the application of oscillatory wave and signal source on the spot, this method dynamically generates reference database of detecting the cable insulation defects, to discriminate the fault patterns correspond to the maximum of function and detect the type, location and severity of cable insulation's defects. Water tree fault of premature cable itself and cable joint can also be detected in this method.

Analysis of electrical tree propagation in XLPE power cable insulation

2011 ◽  
Vol 406 (8) ◽  
pp. 1556-1560 ◽  
Author(s):  
Minghui Bao ◽  
Xiaogen Yin ◽  
Junjia He
Keyword(s):  
Power Cable ◽  
Cable Insulation ◽  
Electrical Tree ◽  
Xlpe Power Cable

scholarly journals Polymer Materials for Power Cable Insulation

Kobunshi ◽  
1972 ◽  
Vol 21 (8) ◽  
pp. 389-393 ◽  
Author(s):  
Masayuki IEDA
Keyword(s):  
Polymer Materials ◽  
Power Cable ◽  
Cable Insulation

scholarly journals Electrical Detection of Degradation in Specimens of HVDC Cable Insulation

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3963
Author(s):  
Douglas Jutsell Nilsson ◽  
Stanislaw M. Gubanski ◽  
Yuriy V. Serdyuk
Keyword(s):  
Published Data ◽  
Cable Insulation ◽  
Isolation System ◽  
Service Environment ◽  
Injection Process ◽  
Electrical Tree ◽  
Metal Seal ◽  
Environmental Isolation ◽  
Inception Voltage ◽  
By Products

One of the challenges in laboratory investigation of degradation and ageing of HVDC cable insulation is related to securing, or in other words, imitating the real service environment of the material specimens. So far, the published data refer to experiments conducted in thermo-oxidative conditions, which is not the case during normal cable operation. In service, the cable insulation is protected by a metallic barrier that blocks the transfer of any substances in and out of the construction. By-products from the cross-linking reactions cannot diffuse out and any foreign substances are blocked from entering the insulation. Thus, in order to generate results that are valid, these conditions must be replicated in laboratory experiments. This contribution presents a methodology elaborated for performing ageing experiments in a hermetically sealed environment. Degradation of the material is evaluated through changes in the electrical tree inception voltage and test object capacitance over time. Securing the environmental isolation is accomplished with an isolation system consisting of a glass enclosure with attached metallic electrodes. Indium is used to create a glass-to-metal seal between the glass and the electrodes. The electrode geometry is of needle–plane type and the needle injection process is semi-automated to ensure specimen repeatability.

Click chemistry‐type crosslinking of a low‐conductivity polyethylene copolymer ternary blend for power cable insulation

2020 ◽  
Vol 69 (4) ◽  
pp. 404-412 ◽  
Author(s):  
Massimiliano Mauri ◽  
Anna I Hofmann ◽  
Diana Gómez‐Heincke ◽  
Sarath Kumara ◽  
Amir Masoud Pourrahimi ◽  
...  
Keyword(s):  
Click Chemistry ◽  
Ternary Blend ◽  
Power Cable ◽  
Cable Insulation
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