Evaluation of Repeatability for the Measurement of DC Conductivity of HVDC XLPE Model Cables
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ORIGINAL ARTICLE
Evaluation of Repeatability for the Measurement of DC Conductivity of HVDC XLPE Model Cables Seung‑Won Lee1 · Hae‑Jong Kim1 · Byung‑Bae Park1 · Hee‑Suk Ryoo1 · Jeon‑Wook Cho1 · Sang‑Soo Oh1 · Jin‑Ho Nam2 · Jang‑Seob Lim3 Received: 20 April 2020 / Revised: 8 July 2020 / Accepted: 10 July 2020 © The Korean Institute of Electrical Engineers 2020
Abstract Cross-linking polyethylene (XLPE) power cables are widely used as an excellent insulation material for high-voltage direct current (HVDC) transmission. For the design and operation of HVDC-based power cables, the conduction properties of XLPE insulation must be obtained. This study aimed to establish a highly reliable conductivity-measurement system that can diagnose the XLPE insulation of cables before and after aging by evaluating the repeatability of their conductivity. In this study, a conductivity-measurement circuit was constructed using the polarization-and-depolarization-current technique. Conductivity was measured according to the conductor temperature by using an applied electric field, and then the repeatability of the measured conductivity was evaluated using a statistical method. The experimental results show that the minimum repeatability was 6%, thereby demonstrating the establishment of a reliable conductivity-measurement system. Keywords HVDC · XLPE · Conductivity · Conduction · Repeatability
1 Introduction Since the 1970s, polymers have been continuously introduced as an insulation material for power cables. Cross-linking polyethylene (XLPE) has become an excellent insulation material for high-voltage direct current (HVDC) extruded cables, with the first commission of an 80-kV DC XLPE cable in 1999 [1]. HVDC XLPE power cables are widely used owing to their advantages of mechanical, thermal, and electrical properties; long-distance-transmission capability;
simple manufacture; and easy installation [2]. The importance of developing techniques for diagnosing and evaluating the XLPE insulation of HVDC cables is an ongoing issue. In general, DC insulation materials are diagnosed using various techniques, such as conductivity, space charge, tan δ, and partial discharge[3–7]. Among them, conductivity is believed to be a major factor contributing in the design and operation of HVDC cables. Because the electric-field distribution inside the insulation of HVDC cable depends on the DC conductivity when the cable is operated in steady
* Jang‑Seob Lim [email protected]
Jin‑Ho Nam Jin‑[email protected]
Seung‑Won Lee [email protected]
1
Superconductivity Research Center, Korea Electrotechnology Research Institute, 12, Bulmosan‑ro 10beon‑gil, Seongsa‑gu, Changwon‑si, Gyeongsangnam‑do 51543, Korea
Byung‑Bae Park [email protected]
2
LS Cable & System Ltd, 27 Gongdan‑ro 140beon‑gil, Gunpo‑si, Gyeonggi‑do 15845, Korea
Hee‑Suk Ryoo [email protected]
3
Department of Electrical Engineering, Mokpo National Maritime University, 91, Haeyangdaehak‑ro, Mokpo‑si, Jeollanam‑do, Korea
Hae‑Jong Kim [email protected]
Jeon‑Wook Cho jw
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