Insulation resistance and breakdown voltage analysis for insulator cover type YSL-70AP

Abstract Electrical energy has become a primary necessity, for every human around the world in globalization era. Electrical energy very important in every human activity to supporting the economy. Currently requires reliable of electrical distribution energy. Reliability of electrical energy supply is measured by the low value of SAIDI and SAIFI. Most of the PLN APJ has not able to fulfil SAIDI and SAIFI targeted by SPLN. There are 54 percent medium voltage disorder due to temporary interference. These disorders are caused by trees, animals and birds. insulator cover applied to reduce temporary interference. The problem is no research explaining the isolation quality and voltage breakdown capacity. This research conducted by quantitative testing and analysis. It was finding that the insulator cover type YSL-70-AP is reliable to reduce temporary disorder and environmentally with consideration: (a) The insulation value is 278.80 Mega Ohm, so that the electrical current of phase-ground fault is only 41.61 micro Ampere, just 0.36 percent of maximum limitation of PLN standard; (b) The voltage breakdown capacity is 49.63 Volt, more than 207 percent of minimum limitation of PLN standard. The voltage breakdown capacity can be increase by wings extension.