First Application of 66-kV Outdoor Terminations with Composite Hollow Insulators for XLPE Cable
by Takeshi Goto *, Yoshikatsu Hori *, Masato Asakawa *,
Masahiro Suetsugu *2 and Tokui Yonemura *3
Abstract:
Composite hollow insulators have a number of advantages over porcelain insulators, including lighter weight, better anti-pollution and anti-explosion properties, and easier construction. They are therefore being considered for use with outdoor terminations installed on towers for branching.
Tokyo Electric Power and Furukawa Electric have jointly developed a 66-kV outdoor termination with composite hollow insulators, and have used it on Tokyo Electric Power's Oihama line--the first such application in Japan.
This paper outlines the performance specified for the 66-kV termination, together with development tests and evaluation results, and the specifications of equipment supplied to the Oihama
Line.
1. Introduction:
Because of their long track record, porcelain insulators are the mainstay of outdoor electrical insulation applications. But over the past 20 years on-going improvements in the characteristics of silicone rubber and other polymer materials have led to increased use of composite insulators,
which are lighter in weight, mechanically stronger and better in anti-pollution properties, as interphase spacers and strain insulators. More recently hollow type composite insulators have also been used for bushings in gas-insulated equipment.
The main structural elements of a composite hollow insulator is an FRP tube having high mechanical strength, covered with a silicone rubber housing or shed having superior weather-resistance and electrical insulation properties, and with metal fittings strongly fastened at both
ends.
Composite hollow insulators are superior to porcelain insulators in several respects, including lighter weight, better anti-pollution and anti-explosion properties, and easier assembly. Active consideration is therefore being given to their introduction when installing outdoor cable terminations on towers.
This paper outlines the process of developing an outdoor termination with composite hollow insulators,describing artificial pollution tests using samples, development specifications, development and evaluation test
results, and the specifications of the products installed.
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