2018.01 / g
Electric Power Generation
20
Installation and maintenance
R449 revision f
AVRs
3983 en -
4 - COMMISSIONING
The commissioning principle is the same
whatever is the type of excitation.
4.1 - In case of standalone
regulation
- Check fuses F1 and F2 which are situated
on terminal block C in the alternator.
- Check the regulator:
- Check the position of the ST3 jumper
(select the frequency, 50 or 60Hz).
- If an external voltage potentiometer is
used, disconnect it from the regulator and
install the ST4 jumper (regulator terminal
block J2) or the ST10 jumper, terminal block
C in the alternator terminal box.
- Turn the internal voltage potentiometer P2
on the regulator fully anti-clockwise.
- Set the alternator to its rated speed using
the drive system.
- The alternator voltage should rise to a
value of 85 to 90%Un.
- Adjust the voltage to the required value
using potentiometer P2.
- Turn potentiometer P1 fully anti-clockwise.
- Perform an on-load test with power factor
= 0.8 or power factor = 1. The voltage should
remain constant within the limits of the
regulator. If it is not stable, see section 1.3.9.
- Stop the alternator and reconnect the
external potentiometer, setting it to the
centre position.
- Set the alternator to its rated speed then,
using the external potentiometer, set the
alternator to its rated voltage.
- The regulator set-up phase is now
complete.
4.2 - In case of 1f regulation (parallel
operation between alternators)
- The previous settings should be made on
each alternator.
- Set the quadrature droop potentiometer to
the centre position and perform an on-load
test.
- With a load at power factor = 1, the voltage
does not drop or only drops slightly; with an
inductive load, the voltage drops. This
voltage drop is set using quadrature droop
potentiometer P1. The no-load voltage is
always greater than the on-load voltage, if
the voltage rises, invert the parallel operation
CT. The voltage quadrature droop is
generally 2 to 3% of the rated voltage.
- The no-load voltages should be identical
on all the alternators intended for parallel
operation between each other.
- Connect the alternators in parallel at no
load.
- Adjust the setting of voltage P2 or the
external voltage potentiometer of one of the
machines, try to eliminate (or minimise) the
circulating stator current between the
machines.
- Do not adjust the voltage further.
- Match the kW power with a minimum load
of 30% by adjusting the drive system speed.
- Adjust quadrature droop potentiometer P1
on one of the machines to balance or
distribute the stator currents.
- If several alternators are in parallel, take
one as a reference.
4.3 - In case of 2f (power factor
regulation) and 3f (voltage match
circuit)
(see R726 manual ref. 2440)
- Check the wiring between the R449 and
the R726. (See the connection diagram).
- Check the information given for the R726:
mains voltage, 2F contact, 3F contact.
- If an external voltage potentiometer is
used, disconnect it from the R726 and add
the ST1 jumper (terminals 3 and 4 of J1) or
disconnect it from terminals 25 and 26 of
terminal block C of the alternator and add
the ST10 jumper.
- If an external PF potentiometer is used,
disconnect it from the R726 and add the ST2
jumper (terminals 9 and 10 of J1) or
disconnect it from terminals 29 and 30 of
terminal block C of the alternator and add
the ST11 jumper.
- Perform a 1F test.
The test principle is the same as in the case
of 1F regulation.
- Matching the alternator and mains voltages
prior to synchronisation (3F):
- If this function is not used, match the
voltages by adjusting the voltage
potentiometer.