Tech-n-Tricks

Earthed System : In Transformer, the star point was solidly grounded. This is called earthed system. In three phases earthed system, phase to earth voltage is 1.732 times less than phase to phase voltage. Therefore voltage stress on cable to metallic sheath is 1.732 times less than voltage stress between conductors to conductor. Where in unearthed system, (if system neutral is not grounded - Delta connection) phase to ground voltage can be equal to phase to phase voltage. In such case the insulation level of conductor to metallic sheath should be equal to insulation level of conductor to conductor. Example: 1.9/3.3 KV (E) , 3.8/6.6 KV (E) cable Unearthed System :  In transformer, to reduce the fault current, the star point is connected to earth through a resistance. If an earth fault occurs on one phase, the voltage of the faulty phase with respect to earth appears across the resistance. Therefore, the voltage of the other two healthy phases with respect to earth rises by 1.7 times. If

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