抄録
In the DC transmission line, electrical performances of insulators are very important subjects. It is necessary to clarify the withstand voltage characteristics of insulator strings under contamination and snow-covering conditions, to establish the insulation design criteria.
For this purpose, DC withstand voltage tests of contaminated insulators were carried out using a DC power source which is supplied by 500kV, 10MVA prototype transformer in the UHV Fog Laboratory of CRIEPI. DC withstand voltage tests of double tension insulator strings covered with snow were also carried out using a thyristor controlled power supply at the Yonezawa testing station.
This paper describes the test results obtained so far on the electrical performance of insulator strings, which is requisite for the design of external insulation of DC transmission lines.
