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Effect of Moisture Content on the Performance of PPLP as a Dielectric for HTS Power Cable


Affiliations
1 Indian Institute of Technology, Kharagpur – 721302, West Bengal, India
2 SuperQ Technologies India Pvt. Ltd., Bengaluru – 560045, Karnataka, India
     

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For the operation of High Temperature Superconducting (HTS) power cables at high voltage levels, the electric field distribution depends on the relative permittivity of dielectric materials. In HTS cables, PolyPropylene Laminated Paper (PPLP) is used as a cold dielectric material and is wrapped helically along the length of the conductor thereby electrically insulating it. During the installation and maintenance process of HTS cables, termination units and joint boxes, the PPLP is often exposed to moisture. The presence of moisture affects the dielectric breakdown strength and dielectric losses. The effect of moisture content in PPLP at ambient and liquid nitrogen temperature has been studied to determine the breakdown strength, relative permittivity (εr) and dissipation factor (tan δ). Effect of moisture content on the performance of PPLP via the measurement of dielectric breakdown strength and relative permittivity for various temperatures and moisture content are discussed in this paper.

Keywords

Dielectric Breakdown Strength, HTS Cable, Moisture Content, Relative Permittivity, PPLP
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  • Effect of Moisture Content on the Performance of PPLP as a Dielectric for HTS Power Cable

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Authors

Maalika Sarkar
Indian Institute of Technology, Kharagpur – 721302, West Bengal, India
Isaac De Souza
Indian Institute of Technology, Kharagpur – 721302, West Bengal, India
Abhik Sarkar
SuperQ Technologies India Pvt. Ltd., Bengaluru – 560045, Karnataka, India
Abhay Singh Gour
Indian Institute of Technology, Kharagpur – 721302, West Bengal, India
Vutukuru Vasudeva Rao
Indian Institute of Technology, Kharagpur – 721302, West Bengal, India

Abstract


For the operation of High Temperature Superconducting (HTS) power cables at high voltage levels, the electric field distribution depends on the relative permittivity of dielectric materials. In HTS cables, PolyPropylene Laminated Paper (PPLP) is used as a cold dielectric material and is wrapped helically along the length of the conductor thereby electrically insulating it. During the installation and maintenance process of HTS cables, termination units and joint boxes, the PPLP is often exposed to moisture. The presence of moisture affects the dielectric breakdown strength and dielectric losses. The effect of moisture content in PPLP at ambient and liquid nitrogen temperature has been studied to determine the breakdown strength, relative permittivity (εr) and dissipation factor (tan δ). Effect of moisture content on the performance of PPLP via the measurement of dielectric breakdown strength and relative permittivity for various temperatures and moisture content are discussed in this paper.

Keywords


Dielectric Breakdown Strength, HTS Cable, Moisture Content, Relative Permittivity, PPLP

References





DOI: https://doi.org/10.33686/prj.v18i1.222127