Generators Synchronization and Load Sharing
Generator Requirements
For operating parallel generators, the following conditions must be met:
1- Waveform: adequate sine wave
2- Phase sequence: all synchronized generators must be in the same sequence; A-B-C (R-Y-B).
3- Frequency: time it takes for one positive peak and one negative peak on sine wave form must match, this depends on two factors: pole numbers and rotor speed.
4- Phase angle difference: the phase shift for all synchronized generators must be equal; in G1 phase A must equal that in G2 phase A and so on.
5- Output voltage amplitude: this value is affected by on rotor speed, stator turns and magnetic field intensity of rotor.
Synchroscope
This device is used for synchronization; to measure the frequency and phase angle differences between two or more AC power systems.
Load Sharing
If these differences are zero, then the two systems can be connected and synchronized with each other. When the two AC electrical power system (asynchronized) are connected, then the whole circuit gets damaged due to the heavy current flow.
If the synchroscope indicates the phase difference of 0 degrees, then the two AC generators are in phase and synchronized with each other.
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