Why frequency is 50 hz only & why should we maintain the frequency constant?We can have the frequency at any frequency we like, but then we must also make our ownmotors, transformers or any other equipment we want to use.We maintain the frequency at 50 Hz or 60hz because the world maintains a standard at 50/60hz and the equipments are made to operate at these frequency.If we give 2334 A, 540V on Primary side of 1.125 MVA step up transformer, then whatwill be the Secondary Current, If Secondary Voltage=11 KV?As we know the Voltage & current relation for transformer-V1/V2 = I2/I1We Know, VI= 540 V; V2=11KV or 11000 V; I1= 2334 Amps.By putting these value on Relation-540/11000= I2/2334So,I2 = 114.5 AmpsWhat are the points to be considered for MCB (miniature circuit breaker selection)?I(L)x1.25=I(MAX) maximum current. Mcb specification is done on maximum current flow incircuit.