Basler SR4A, Инструкция по эксплуатации, Страница: 27 / 43

4-5
(a) Place each set in operation in accordance with paragraph 4-6a.
(b) Verify the paralleling CT secondary is not shorted. (Unit parallel switch in PARALLEL
position.)
(c) Apply 25 to 100% unity power factor load to the set under test. Generator voltage
should not change more than 1% and the frequency should decrease if the governor is
set for droop operation.
(d) Apply a 25 to 100% 0.8 P.F. (inductive load; voltage should droop from 4 to 6% with
rated load. If the voltage rises instead of drooping, reverse the CT sensing leads.
(2) During these tests, verify the voltage and speed do not drift or jump erratically. Also, the
generator voltage sequence can be verified at this time.
(3) When the preceding tests has been satisfactorily completed, the sets should parallel proper-
ly.
c.
Conditions Necessary for Paralleling
. In order to prevent damage to the generator and/or
prime mover, paralleling should be attempted only when the speeds (frequencies) are equal and at
the instant when the generator voltages are equal. That is, they have the same phase sequence of
voltage and the voltages are in phase.
d.
Metering
. In order to initiate paralleling and to check for proper parallel operation, all generators
should be equipped with the following monitoring equipment:
(1) AC Voltmeter (1 or 2).
(2) Frequency Meter (1 or 2).
(3) Synchroscope or a set of lights, etc. (indicates an in-phase condition).
(4) Ac Ammeter (1 per set).
(5) kW Meter (1 per set).
(6) KVAR or Power Factor Meter (1 per set).
(7) Field Current Ammeters.
e.
Sequence of Operation (Parallel)
.
1. The following instructions describe the procedures to be followed for paralleling generators
on an isolated bus. These procedures should be completely reviewed and understood, before
paralleling is attempted.
(a) Start generator set No. 1.
(b) Close the circuit breaker connecting it to the bus.
(c) Adjust its voltage and frequency to nominal.
(d) Apply the load. (If possible, load should be 10% or more of its kW rating.
(e) Start generator set No. 2.
(f) Adjust its voltage to nominal.