DC field distribution around an HVDC cable termination

Källstrand, Birgitta; Borg, Daniel; Walfridsson, Lars; Johansson, Kenneth; Doiron, C. B.; Falth, Fredrik; Saltzer, Markus

doi:10.1109/ceidp.2015.7352109

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…The reason is that the internal insulation structure of cable accessories is composed of multilayer solid insulation, which contains cross-linked polyethylene (XLPE), silicone rubber (SIR) and so forth. The different conductivities of insulating materials lead to a complex accumulation of space charges and serious electric field distortion, which can lead to insulation aging [4][5][6]. It is necessary to study the insulation and breakdown of cable accessories to ensure the safe and stable operation of HVDC cable systems.…”

Section: Introductionmentioning

confidence: 99%

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Electrical Tree Initiation and Growth in Silicone Rubber under Combined DC-Pulse Voltage

Han

2018

Energies

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Electrical tree is a serious threat to silicone rubber (SIR) insulation and can even cause breakdown. Electrical trees under alternating current (AC) and direct current (DC) voltage have been widely researched. While there are pulses in high-voltage direct current (HVDC) cables under operating conditions caused by lightning and operating overvoltage in the power system, little research has been reported about trees under combined DC-pulse voltage. Their inception and growth mechanism is still not clear. In this paper, electrical trees are studied under several types of combined DC-pulse voltage. The initiation and growth process was recorded by a digital microscope system. The experimental results indicate that the inception pulse voltage is different under each voltage type and is influenced by the combined DC. The initial tree has two structures, determined by the pulse polarity. With increased DC prestressing time, tree inception pulse voltage with the same polarity is clearly decreased. Moreover, a special initial bubble tree was observed after the prestressing DC.

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Section: Introductionmentioning

confidence: 99%

“…The aging of insulation in cable accessories is a gradual process. Electrical tree is the main reason for insulation aging and breakdown [5][6][7][8][9][10]. In the study of alternating current (AC) trees, a number of models have been proposed, while there is no alternating electric field under DC voltage and most models are not suitable.…”

Section: Introductionmentioning

confidence: 99%

Electrical Tree Initiation and Growth in Silicone Rubber under Combined DC-Pulse Voltage

Han

2018

Energies

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Electric field control in DC cable test termination by nano silicone rubber composite

Song

Zhao

et al. 2017

AIP Advances

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The electric field distributions in high voltage direct current cable termination are investigated with silicone rubber nanocomposite being the electric stress control insulator. The nanocomposite is composed of silicone rubber, nanoscale carbon black and graphitic carbon. The experimental results show that the physical parameters of the nanocomposite, such as thermal activation energy and nonlinearity-relevant coefficient, can be manipulated by varying the proportion of the nanoscale fillers. The numerical simulation shows that safe electric field distribution calls for certain parametric region of the thermal activation energy and nonlinearity-relevant coefficient. Outside the safe parametric region, local maximum of electric field strength around the stress cone appears in the termination insulator, enhancing the breakdown of the cable termination. In the presence of the temperature gradient, thermal activation energy and nonlinearity-relevant coefficient work as complementary factors to produce a reasonable electric field distribution. The field maximum in the termination insulator show complicate variation in the transient processes. The stationary field distribution favors the increase of the nonlinearity-relevant coefficient; for the transient field distribution in the process of negative lighting impulse, however, an optimized value of the nonlinearity-relevant coefficient is necessary to equalize the electric field in the termination.

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Electrical Tree in Silicone Rubber under Voltage Combined of DC and Pulse

Wang

Han

et al. 2018

2018 IEEE 2nd International Conference on Dielectrics (ICD)

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DC field distribution around an HVDC cable termination

Cited by 4 publications

References 7 publications

Electrical Tree Initiation and Growth in Silicone Rubber under Combined DC-Pulse Voltage

Electrical Tree Initiation and Growth in Silicone Rubber under Combined DC-Pulse Voltage

Electric field control in DC cable test termination by nano silicone rubber composite

Electrical Tree in Silicone Rubber under Voltage Combined of DC and Pulse

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