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SEE 3433 MESIN ELEKTRIK. SYNCHRONOUS MACHINES Power and Torque Characteristics. jX s. R a. + V t . I a. + E f . This gives :. Active power. Reactive power. Power and Torque Characteristics. Let V t = V t 0 o. E f = E f  o. Complex power is given by:.

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SEE 3433 MESIN ELEKTRIK


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    1. SEE 3433 MESIN ELEKTRIK SYNCHRONOUS MACHINESPower and Torque Characteristics

    2. jXs Ra + Vt  Ia + Ef  This gives : Active power Reactive power Power and Torque Characteristics Let Vt = Vt0o Ef = Efo Complex power is given by: S = VtIa* = P + jQ

    3. P = Active power = Q = Reactive power = Power and Torque Characteristics S = VtIa* = P + jQ If |Z| = Xs hence  = 90o

    4. P, T Pmax Tmax  90o Power and Torque Characteristics

    5. P, T Pmax Tmax  90o Power and Torque Characteristics The machine will loose synchronism when the power angle,  greater than 90o e.g. generator operation. As prime mover power increased, generator need to produce torque to ‘pull’ machine to synchronism – limit when =90o The Tmax or Pmax can be increased by increasing the field excitation