Answer / mahesh sali

For Cal.the cable size , pl. see the below size

1) Cal. the full loasd current of motor
2) cal. the voltage drop from ht starter panel to motor at
starting and running .
3) as per IEC rule u should take the 20% additional to ur
selected size of cable.

Base on the above step we can easily cal. the size of cable

Answer / manoj

Calculate steady state voltage drop and motor starting voltagedro they should be within limit also the short circuit withstand capacity to satisfy i2t

suppose MCC (Motor control center)panel work on field the relay on this damage or not work and earth fault occurs in this and no indication in relay panel given below. than MCB trip or not and what effect the panel how find relay will damage or not work.

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234 MVA Generator 3 phase Short circuit current Values required? Gen set Rating-234 MVA, Gen Voltage-18kv, PF;0.8, Xdv:23.5 %, Transformer Rating-18/380KV, 680MVA,Yndd1 two winding, Step up TR, ZT:35.50 %,X/R 4.33 Gen CB Position, CB open ,Disconnected open, Generator Running Voltage 18 Kv, Bi mistakes generator side earth switch Closed during that time short circuit current level in 3 Phase required, and how to test on site 234MVA Generator Short circuit current,

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