Page 364 - Offshore Electrical Engineering Manual

Running the Prime Mover 351

8. Interface with mechanical components
A check must be made that all nonelectrical parts of the generation system are
complete and functioning, including
a. the fuel system,

b. the engine controls including the governor and overspeed protection

devices,

c. the engine and alternator cooling system,

d. the ventilation system,

e. the air intake and exhaust systems,
f. the engine starting equipment,

g. the generator package fire and gas detection and protection systems.
9. Associated electrical power connections
Assuming the associated switchgear has already been commissioned, phase
and earth cabling and conductors, including neutral earthing resistors, should
be checked for continuity and insulation.
10. Before starting the prime mover
Before starting the prime mover, the generator circuit breaker should be racked
into the test position, the associated VTs racked in, fuses replaced and the
means of preventing generator rotation removed.

RUNNING THE PRIME MOVER
With the prime mover running, the following equipment may be commissioned:

1. Under-/overvoltage protection check (note that this should have been checked
beforehand by primary injection).
2. Automatic synchronising unit (note that with the circuit breaker in the test
position, this consists of observing if the circuit breaker closes at the correct
phase angle and slip frequency limits). A second generator is required for a
reference.
3. Manual synchronising equipment and check-synch relay.
4. The excitation system including AVR setting.
5. Over-/underfrequency protection check.
6. A general check should be made to ensure that control panel instrument read-
ings are normal for the generator on no-load. For generator load testing, it is
advisable to connect a suitable load bank to the associated switchboard (or
direct to the alternator if the switchboard is already in use), so that the electrical
and mechanical stability of the package may be checked before it supplies load
to platform consumers. The load bank must include both resistive and reactive
switchable elements.