Evaluation of Electric Field and Space Charge Dynamics in Dielectric under DC Voltage with Superimposed Switching Impulse

Ik-Soo Kwon, Sun-Jin Kim, Mansoor Asif and Bang-Wook Lee
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Ik-Soo Kwon: Department of Electrical and Electronic Engineering, Hanyang University, Ansan 15588, Korea
Sun-Jin Kim: Department of Electrical and Electronic Engineering, Hanyang University, Ansan 15588, Korea
Mansoor Asif: Department of Electrical and Electronic Engineering, Hanyang University, Ansan 15588, Korea
Bang-Wook Lee: Department of Electrical and Electronic Engineering, Hanyang University, Ansan 15588, Korea

Energies, 2019, vol. 12, issue 10, 1-15

Abstract: The influx of a switching impulse during DC steady-state operations causes severe electrical stress on the insulation of HVDC cables. Thus, the insulation should be designed to withstand a superimposed switching impulse. All major manufacturers of DC cables perform superimposed switching impulse breakdown tests for prequalification. However, an experimental approach to study space charge dynamics in dielectrics under a switching impulse superposed on DC voltage has not been reported yet. This is because, unlike the DC stress, it is not possible to study the charge dynamics experimentally under complex stresses, such as switching impulse superposition. Hence, in order to predict and investigate the breakdown characteristics, it is necessary to obtain accurate electric field distribution considering space charge dynamics using a numerical approach. Therefore, in this paper, a numerical study on the switching impulse superposition was carried out. The space charge dynamics and its distribution within the dielectric under DC stress were compared with those under a superimposed switching impulse using a bipolar charge transport (BCT) model. In addition, we estimated the effect of a superimposed switching impulse on a DC electric field distribution. It was concluded that the temperature conditions of dielectrics have a significant influence on electric field and space charge dynamics.

Keywords: bipolar charge transport model; DC electric field; space charge dynamics; switching impulse superposition (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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