Hi alehman
For medium voltage motor (350 HP), the nameplate are missing, thens estimated reactance for first cycle is 0.17 pu (at 150 KVA base, 1 KVA = 1 HP), the estimated reactance for interrupting network (0.17 X 1.5)?
Applying Table 4A1, Line "Individual large inductions motors, usually...
Hi alehman.
The base is motor rating.
For 20 pu in momentary, Table 4-2, column "first cycle network", line "all others, 50 HP and above" 1.2Xd" or estimated the first cycle network X=0.20 pu based on motor rating.
For 50 pu in interrupting, Table 4-2 column "interrupting network"...
I need help for the selection from a circuit breaker to 4.16 KV.
For the momentary duty, I calculated the first-cycle network, using a estimated first-cycle reactance of 0.17 pu for motors at 4.16KV, 350HP; a estimated first cycle reactance of 20 pu for motors to 480V, 75 HP and 60 HP.
For...
