Shutdown; Alternators In Parallel; With Each Other And / Or With The Electrical Grid - WEG G Serie Manual De Instalación, Operación Y Mantenimiento

5.5 SHUTDOWN

a) Before stopping the alternator, open the main circuit
breaker to disconnect the load;
b) If the alternator is equipped with space heaters, make
sure that they remain energized while the switch
remains stationary.
DANGER
Even after de-excitation, there is still voltage at
the terminals of the machine, so only after the
full stop of the equipment it is allowed to do
any work.
Risk of death if not attending to that described
above.

5.6 ALTERNATORS IN PARALLEL

5.6.1 With each other and / or with the
electrical grid
Minimum requirements for operation in parallel of the
alternator, not including the drive machine control:
1. The alternator must have the same operating voltage
of the other alternator or the grid;
2. The voltage regulator must allow the operation of the
alternator in parallel;
3. Add a parallel CT (In / 5) of 5 -10 VA phase which is
not used as a reference for the voltage regulator and
make the electrical connection according to the
manual of the voltage regulator.
4. Having a panel suitable for protection and operation
of the alternator in parallel.
5. The timing and setting of the active power must be
imposed by the speed control of primary machines.
In case of high currents neutral appear, use a ground coil
or open the neutral connection of one alternator. That
happens especially when the alternators are not equal or
when feeding loads with high harmonic content.
ATTENTION
This type of installation must be performed by
technical staff.
For transient operations in parallel (e.g. loading
ramp) in which the switch will operate in a
simple way after a period in parallel, the parallel
CT should be short-circuited, it is therefore
unnecessary in this operation.
10680382 Installation, operation and maintenance manual – Synchronous Alternator – G line - Horizontal
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