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access icon openaccess Interfacial space charge characteristic of PPLP insulation for HVDC cables

This is an open access article published by the IET and CEPRI under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 01/01/2020, Accepted 01/04/2020, Revised 11/03/2020, Published 09/04/2020

High-voltage DC (HVDC) cables show more efficiency than high-voltage AC cables over the long distance power transmission and have attracted significant attention recently due to rapid developments in off-shore wind farm. Polypropylene laminated paper (PPLP) insulation based HVDC cables have provided a reliable operation for many years and are the highest voltage level in operation at the moment. In this study, the authors intend to understand the electrical performance of PPLP insulation system by examining space charge in detail, especially at the interfaces. It has been found that the interface between polypropylene and Kraft paper acts as trap for charge carriers, resulting in an optimal electric field distribution in PPLP insulation system. The optimal electric field distribution enhances overall electrical performance of PPLP insulation, including higher dc breakdown strength and lower electrical conductivity.

Inspec keywords: HVDC power transmission; HVDC power convertors; power cable insulation; electrical conductivity; space charge; paper; electric breakdown; wind power plants

Other keywords: long distance power transmission; polypropylene; PPLP insulation system; high-voltage DC cables; charge carriers; off-shore wind farm; electrical performance; high-voltage AC cables; interfacial space charge characteristic; Kraft paper acts; HVDC cables; paper insulation; highest voltage level; optimal electric field distribution enhances

Subjects: Other topics in statistics; Organic insulation; Reliability; Power cables; d.c. transmission; Dielectric breakdown and discharges; Wind power plants

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