Perspectives of temperature assessment based on wave propagation for dynamic rating of medium-voltage power cables

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Abstract

This paper explores the feasibility of wave propagation characteristics as means of probing the temperature of an underground power cable. It utilises the relation between wave velocity and relative permittivity. The permittivity and its temperature dependency are specific for the applied insulation materials. The investigated cable is a three-phase XLPE-insulated mediumvoltage cable with a common earth screen. Combined thermal and electromagnetic analysis is applied to account for the temperature distribution over the cable cross section. The corresponding permittivity distribution is based on the temperature dependency measured for an XLPE sample. Temperature monitoring is achieved by observing the signal transit time along the power cable. The measured variation in signal propagation velocity and attenuation, compared to model predictions, provides an estimate of the cable temperature. It is shown that a sensitivity within 2°C can be achieved for a temperature near the maximum operating value for XLPE insulation.
Original languageEnglish
Title of host publication22th International Symposium on High Voltage Engineering (ISH 2021)
PublisherInstitution of Engineering and Technology (IET)
Pages278-284
Number of pages7
ISBN (Electronic)978-1-83953-605-2
DOIs
Publication statusPublished - 20 Jun 2022
Event22nd International Symposium on High Voltage Engineering, ISH 2021 - Hybrid Faculty of Electrical Engineering Xi'an Jiatong University, Xi'an, China
Duration: 21 Nov 202126 Nov 2021
Conference number: 22
https://www.ish2021.org/

Conference

Conference22nd International Symposium on High Voltage Engineering, ISH 2021
Abbreviated titleISH 2021
Country/TerritoryChina
CityXi'an
Period21/11/2126/11/21
Internet address

Keywords

  • DYNAMIC CABLE RATING
  • MULTI-CONDUCTOR TRANSMISSION LINES
  • POWER CABLE INSULATION
  • SIGNAL PROPAGATION MODES
  • TEMPERATURE MONITORING

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