Development of High Voltage DC-XLPE Cable System

Topics: Electric power transmission, High voltage cable, Power cable Pages: 8 (5030 words) Published: April 27, 2014

Development of High Voltage DC-XLPE Cable System
Yoshinao MURATA*, Masatoshi SAKAMAKI, Kazutoshi ABE, Yoshiyuki INOUE, Shoji MASHIO, Seiji KASHIYAMA, Osamu MATSUNAGA, Tsuyoshi IGI, Masaru WATANABE, Shinya ASAI and Shoshi KATAKAI

We have developed a cross-linked polyethylene (DC-XLPE) insulating material that has excellent properties for DC voltage applications. Our high-voltage (HV) DC XLPE cable and factory joints using this material showed positive results in a polarity reversal test and other long-term tests aiming at high voltage operation up to 500 kV. In addition, this cable passed 250 kV pre-qualification tests and type tests, which also include polarity reversal tests, in accordance with the test conditions specified by the CIGRE TB 219. All the tests were conducted at 90°C and the results showed that our HVDC XLPE cable and accessories are capable of normal operation and polarity reversal operation at 90°C in actual HVDC link lines. J-Power Systems Corporation is now ready to supply this cable and related products to the market. Keywords: HVDC, XLPE cable, type test, PQ test, CIGRE Technical Brochure

1. Introduction
High voltage direct current (HVDC) power transmission lines in Japan consist of Hokkaido-Honshu DC link and Kii Channel DC link that connects Shikoku with Honshu. As for HVDC power transmission in foreign countries, main applications have been for long-distance power transmission such as intercontinental links. However, in recent years, there has been a growing trend toward its application to offshore wind power generation, which is being actively

introduced in Europe as a renewable natural energy
source. As its introduction has progressed, the locations of the wind power generation facilities have been shifted from
coastal areas to offshore areas due to space constraints. As the power transmission distance has increased, HVDC
power transmission technology has drawn more attention.
Previously oil-impregnated insulation cables, such as
mass impregnated (MI) cable and oil-filled (OF) cable,
have been applied to DC power transmission. In recent
years, however, because of the increasing awareness for environmental protection, extruded insulation cables have come to be desired as they have no fear of oil leakage.
On the other hand, cross-linked polyethylene insulation cable, which is currently widely applied to AC power transmission, is known to have a number of problems in insulation when used for DC usage, i.e., prominent accumulation of space charge in cross-linked polyethylene (XLPE) insulation material. Therefore, we have developed a DCXLPE insulation material that has excellent DC characteristics. We have also developed a DC-XLPE cable using the above mentioned material as insulator. This paper describes

the excellent DC characteristics of the DC-XLPE insulation
material developed for DC applications, and reports on the
implementation status of type tests and pre-qualification
(PQ) tests in accordance with the International Council on
Large Electric Systems (CIGRE) Technical Brochure on actual cables and accessories.

2. Changes in DC Cable Technology and History
of DC-XLPE Cable Development
This chapter introduces the outline of changes in
HVDC cable technology and the history of our DC-XLPE
cable development.
In 1954, the world’s first operation of HVDC power
transmission began between the mainland of Sweden and
Gotland Island(1). At that time, MI cables using insulating
paper impregnated with high viscosity insulating oil were
used, and for higher voltage and larger capacity applications, OF cables were adopted, using insulation paper which was impregnated with low viscosity insulating oil and
kept in pressurized condition. Since then, MI cables and
OF cables, i.e., oil-impregnated paper-insulated cables,
have been the mainstream of DC power transmission cables. The oil-impregnated insulation cable technology has developed in response to demand...

References: Investigation R&D Committee on Transition of DC cable Technology, “Transition of DC cable technology and future tasks,” Technical
Report of IEEJ, No.745 (1999) [in Japanese]
CIGRE 2010, B4_203_2010, (2010)
B1-2 (2012)
Power Delivery, Vol.13, No.1, pp.7-16 (1998)
M. Shimada, 2001, “Development of 500 kV XLPE Insulated DC Cable,”
The Hitachi Densen, No.21, pp.65-72 (2002) [in Japanese]
Working Group WG21-01 CIGRE, “Recommendation for testing DC
extruded cable systems for power transmission at a rated voltage up
to 250 kV,” CIGRE Technical Brochure 219 (2003)
Subject 3, Question No.1, Registration No.919 (2012)
IEE of Japan, Vol.114-B, No.6, pp.633-641 (1994)
TF D1.16.03 CIGRE, “Emerging Nanocomposite Dielectrics,” ELECTRA No.226, pp.24-32 (2006)
Electrical Insulation,” CIGRE 2008, D1-301 (2008)
FM, Vol.129, No.2, pp.97-102 (2009) [in Japanese]
pp.271-274 (2007)
Working Group WGB1-32 CIGRE, “Recommendation for testing DC
extruded cable systems for power transmission at a rated voltage up
to 500 kV,” CIGRE Technical Brochure 496 (2012)
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