Study on Development Characteristics of Partial Discharge in Oil-Pressboard Insulation under Constant DC Voltage

Chengjie Zhang, Yuan Li (), Senhong Yang and Ranran Li
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Chengjie Zhang: College of Electrical Engineering, Sichuan University, No. 24 Yihuan Road, Chengdu 610065, China
Yuan Li: College of Electrical Engineering, Sichuan University, No. 24 Yihuan Road, Chengdu 610065, China
Senhong Yang: College of Electrical Engineering, Sichuan University, No. 24 Yihuan Road, Chengdu 610065, China
Ranran Li: College of Electrical Engineering, Sichuan University, No. 24 Yihuan Road, Chengdu 610065, China

Energies, 2023, vol. 16, issue 10, 1-14

Abstract: The converter transformer is the core equipment of HVDC transmission system, the valve-side winding of which needs to withstand DC voltage. Partial discharge is one of the main threats to the safe operation of converter transformer, yet the characteristics of partial discharge development of the oil-pressboard insulations under constant DC voltage are insufficiently understood. In order to better understand the partial discharge characteristics of the oil-pressboard insulation under DC voltage and provide deeper theoretical support for insulation diagnosis of converter transformers, development characteristics including the time-varying tendency of discharge magnitude and repetition rate of partial discharge in oil-pressboard insulation under constant positive and negative DC voltage were studied. The results indicate that the development of partial discharge in a needle-plane oil-pressboard insulation model under constant DC voltage has three stages: the intensive discharging stage, the silent-burst stage, and the breakdown stage. Throughout all stages, the partial discharge magnitude and repetition rate first decrease and increase afterwards. At the silent-burst stage, the partial discharge appears in the form of a “cluster” with very large magnitude and repetition rate. Each cluster exists for tens of seconds but with at a very long interval with each other. Further analysis shows that the repeated accumulation and dissipation of free charges on the surface of the pressboard cause the above phenomena. Negative charges are easy to accumulate and difficult to dissipate under the same voltage amplitude compared to positive charges, leading to a weaker actual electric field at the needle tip and thus partial discharges under negative DC voltage with a lower magnitude and longer interval.

Keywords: oil-pressboard insulation; partial discharge; DC voltage (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: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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