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  1. roland64

    Interpretation Red Book IEEE Sdt 141

    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...
  2. roland64

    Interpretation Red Book IEEE Sdt 141

    Hi Alehman Is correct, 0.20 pu and 0.50 pu according to Table 4-2 foor notes, IEEE std 141-1993. Pardon went an error when writing the reactance.
  3. roland64

    Interpretation Red Book IEEE Sdt 141

    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"...
  4. roland64

    Interpretation Red Book IEEE Sdt 141

    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...

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