Insulation Resistance Characteristics of Dry DC Link Capacitors in the Presence of High Temperatures and Operating Voltages

Xiaowu Sun (), Ying Qiao, Yinda Li, Chongfeng Cao and Shenrong Feng
Additional contact information
Xiaowu Sun: Wuxi Power Filter Co., Ltd., Wuxi 214112, China
Ying Qiao: Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Yinda Li: Wuxi Power Filter Co., Ltd., Wuxi 214112, China
Chongfeng Cao: Wuxi Power Filter Co., Ltd., Wuxi 214112, China
Shenrong Feng: Wuxi Power Filter Co., Ltd., Wuxi 214112, China

Energies, 2024, vol. 17, issue 5, 1-16

Abstract: Insulation resistance is a vital factor in dry DC link capacitors (DCLCs), and crucially influences their voltage equalization and energy storage performance. However, at present, there is a lack of experimental observation on the insulation resistance characteristics of DCLCs in the presence of high temperatures and operating voltages. In the present study, the insulation resistance and conductivity of DCLCs are methodically analyzed. For this purpose, the corresponding test platform is appropriately fabricated, the insulation resistance measurement experiments are performed at various temperatures and operating voltages, and the factors affecting the insulation resistance and conductivity of the DCLC are carefully examined. The results reveal that the insulation resistance of the DCLC reduces exponentially with the growth in voltage and operating temperature. When the operating voltage becomes greater than 4480 V or the operating temperature reaches higher than 70 °C, the decline in insulation resistance slows down. The conductivity of metalized polypropylene film in the DCLC increases exponentially with increasing voltage and temperature. By increasing the operating voltage from 1960 V to 5600 V and the temperature from 20 °C to 90 °C, the DCLC’s insulation resistance exhibits a descending trend from 891.30 MΩ to 2.14 MΩ, while its conductivity grows from 3.49 × 10 −16 S/m to 1.47 × 10 −13 S/m. The results reveal that the key factors affecting the insulation resistance of the DCLC are the polypropylene film and the metal evaporated from the metal layer. This research is anticipated to provide a valuable reference for the further development of science and technology pertinent to the insulation resistance of DCLCs.

Keywords: DC link capacitor; insulation resistance; conductivity; volume conductivity; metalized polypropylene film; self-discharge time constant (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: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/17/5/1147/pdf (application/pdf)
https://www.mdpi.com/1996-1073/17/5/1147/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:17:y:2024:i:5:p:1147-:d:1347840

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().