Assessment of Cooling Conditions of Thermoplastic Insulation and Uniformity of Breakdown Strength for Medium-Voltage Direct Current Extruded Cable Insulation

Keon-Hee Park, Seung-Won Lee, Hae-Jong Kim and Jang-Seob Lim ()
Additional contact information
Keon-Hee Park: Division of Marine Mechatronics, Mokpo National Maritime University, Mokpo 58628, Republic of Korea
Seung-Won Lee: Power Cable Research Center, Korea Electrotechnology Research Institute, Changwon 51543, Republic of Korea
Hae-Jong Kim: Power Cable Research Center, Korea Electrotechnology Research Institute, Changwon 51543, Republic of Korea
Jang-Seob Lim: Power Cable Research Center, Korea Electrotechnology Research Institute, Changwon 51543, Republic of Korea

Energies, 2024, vol. 17, issue 20, 1-11

Abstract: Research has been conducted on medium-voltage direct current (MVDC) to address the limited transmission capacity of existing AC power transmission lines and to achieve efficient integration of renewable energy sources. Another method to increase the transmission capacity is to raise the maximum allowable temperature of the power cable. The maximum allowable temperature for cross-linked polyethylene (XLPE) in commercial power cables is 90 °C. Polypropylene (PP) is considered as an alternative material. PP has a maximum allowable temperature of 110 °C and possesses thermoplastic properties, making it environmentally friendly. However, PP may not ensure uniformity of the insulation layer depending on the extrusion process, including cooling conditions. This study aimed to determine the applicability of MVDC cables by assessing the uniformity of the insulation layer of extruded cables, considering the cooling conditions of PP in specimens. For the cooling conditions, ambient air, cooling press, and water cooling were evaluated for DC breakdown strength. Furthermore, the uniformity of the breakdown strength of the insulation layer, which was divided into sections such as conductor and sheath, was evaluated for commercial PP, XLPE, and the developed PP cables. This study aims to provide a comprehensive analysis of the DC BD strength of PP under various cooling conditions and emphasize the importance of uniformity in extruded cable sections.

Keywords: breakdown strength; cooling condition; extruded power cable; medium-voltage direct current (MVDC); polypropylene (PP) (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 complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/17/20/5167/pdf (application/pdf)
https://www.mdpi.com/1996-1073/17/20/5167/ (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:20:p:5167-:d:1500568

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 ().