Masato Tsuruga*
Naohisa Numata*
Hideaki Nagano**
ABSTRACT: The first 400 kV underground transmission line was commissioned between the Ayer Rajah Substation and the Labrador Substation as a part of the 400 kV transmission network in Singapore. The transmission line consists of three circuits of 400 kV single core 2000 mm2polypropylene laminated paper (PPLP) insulated aluminum sheathed oil-filled cable laid in reinforced concrete trenches. Hitachi Cable, Ltd. was awarded a contract by PowerGrid Ltd. in January 1995 for supply and installation of one circuit. The cable and accessories were subject to type approval tests prior to shipment for verification of their electrical performance. Strict quality control was introduced to both manufacturing and construction work. The project was successfully completed and the cable system was handed over to the client in April, 1998.
