Need to synchronize
- We synchronize two or more generator to meet the increasing load ( maneuvering, loading/discharging)
- To achieve a smooth transition without blackout ( changing over generator for maintenance etc...)
- To test the safeties on the alternator side without causing a blackout
Terminologies
- A generator connected to the bus bar is known as running generator
- The generator to be synchronized is known as an incoming generator.
Synchronizing manual generator using synchronoscope
- After starting the incoming generator check the voltage, frequency on the incoming generator bus bar panel
- To achieve a smooth operation make sure the incoming generator speed is slightly faster than the running generator (about 3-5 rpm higher than the running generator)
- Speed of the generator can be adjusted by the governor/speed controller placed on the generator panel
- Turn the knob of the synchronoscope selecting the incoming generator
- The synchroscope starts to rotate in the clockwise direction as at about 5 sec per revolution as the incoming generator rpm.speed is higher than the running generator
- If the synchronoscope rotates in the anti-clockwise direction that means the incoming generator is slower than the running generator this can be corrected by increasing the generator rpm/speed
- As the synchroscope rotates in the clockwise direction close the breaker when the pointer points to 11 'O' clock.
- Share the load on both the generator by using governor controller (increase the load in the incoming generator and decrease the load in the running generator simultaneously)
- Turn the knob of synchroscope to the off position
Synchronizing generator using Auto synchronoscope
This is used on most of the new UMS ships
- After starting the incoming generator check the voltage, frequency on the incoming generator bus bar panel
- after confirming all parameter press the auto synchronize button
- the breaker will close automatically after adjusting the phase sequence
- load sharing is done automatically