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What is basic impulse insulation level? And how it is calculated for sub-
station?
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Answer Posted / madivalanagaraja@gmail.co
The Basic Impulse Insulation Levels refers to the ability of electric equipment such as transformers to withstand lightning surges. When lightning strikes a transmission line, a traveling wave is created. This traveling wave travels along the line and damages the transformer winding.
Surge arresters mounted on the line can mitigate the surge, however, they cannot totally eliminate it. Voltage surges can also be created by the switching of circuit breakers and switches.
The BIL or the Basic Impulse Insulation level indicates the ability of the transformer to withstand these heavy surges. Transformers with a rating of 600 volts and below are designed to have a BIL of 10 kV.
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L.A. (Lightening Arrester) is located at a place from where transmission line enters the transmitting substation. So L.A. (Lightening Arrester) is the first equipments which has to encounter with lightening, high voltage surges and switching surges. It has to absorb energy of lightening, high voltage surges, and switching surges. L.A. (Lightening Arrester) is made up of layers of semiconductors. If these layers can not tolerate energy released by lightening, high voltage surges, and switching surges the L.A. (Lightening Arrester) blasts.
