LNG Steam Simulator Exercise


014. Run the Simulator to Parallel the Turbo Alternator

[Load Snapshot "Ex_014_Changing Over from DO to HFO_Burning"]

- Asssume scenario as described below [but check to confirm] and then follow the given procedures


Electrical Power:-

Shore Power:Off; Emergency Generator:Auto Stand-by; Turbo Generators: One running and the other Off; Diesel Generator:On

Deaerator:-

Full with guage glass reading between 60~70 mm

Both Boilers:-

Both Boiler Press - aboout 6 Mpa; Both boilers are running on HFO supply.

Condenser:-

Condenser Vacuum is Satisfactory and Cooling on

Distilled Water Tank (DWT) & Atmospheric Drain Tank (ADT):-

Both DWT & ADT about 60% full.

>> Procedure to Parallel a Turbo Alternator:-

D/A S/B
1 Check that the alternator on the board is running at 60 Hz 440 V - If not then adjust.
2 Switch Synchroscope on.
T/A S/B:
3 Select auto AVR and adjust the excitation to give 440 V terminal voltage (not excitation voltage)
4 The Power Available light illuminates, switch the synchroscope ON
5 Select the Incoming Machine to T/A 1 or(T/A 2 - if paralleling No. 2)
Optional: Switch the Check Sync ON. This device prevents the operator from paralleling out of phase, however a good operator will only attempt to close the incoming machine ACCB when the phase deiifernce is small(Synchroscope at approximatel 12'o clock).
6 Adjust the speed of the T/A to just over 60 Hz such that the synchroscope is rotating slowoly clockwise.
7 When the synchroscope pointer is close to 12 o'clock - say(5 to 12 - if it were a clock) then close the ACCB.
8 Load can be shared between the two alternators by increasing and lowering the speed adjusting lever.

NOTE:

1) Check Knowledgebase - .........