다른 굵기의 6/10[㎸]급 CV 케이블 직선접속부 안전성 평가

This paper describes the safety assessment of power cable splices connecting different sized 6/10[㎸] class power cables. To assess the safety, AC withstand voltage tests, partial discharge tests and impulse tests were carried out to the cable splice specimens and thermal rise due to overload and cross section of joint were examined as well. As a result, a breakdown due to the 4.5[ U?](27[㎸ ac ]) application could not found for 5 minutes. Under 1.73[U?](10.4[㎸ ac ]) application, partial discharges of 4～8[pC] were detected. In impulse tests, all the specimens withstood to the standard waveforms of 75[㎸ peak ](1.2×50[㎲]) without any breakdowns. In addition, the temperature on the splice rose by 3[℃] when the 200[A] flew through the splice for 20minutes, however the thermal rise of 3[℃] was considered due to the atmospheric temperature. After all the electrical tests, the cross section of the splice was visually examined. The conditions of the conductors of both 185[㎟] and 240[㎟] were good.