Basler SR4A, Инструкция по эксплуатации, Страница: 26 / 43

4-4
a. The following procedures is for use on systems where the generator voltage does not build up and
no field flash provisions are incorporated. (There is usually sufficient residual magnetism to allow the
generator voltage to build up without additional flashing circuit.)
b. With the prime mover at rest (not rotating) apply a dc flashing source across terminals F+ and A-
on the regulator. The positive of the flashing source must be connected to F+ and negative to A-.
c. When automatic field flashing is required, a dc source not in excess of 125 V should be used and
the circuit must be interconnected as shown in Figure 3-5. A series limiting resistor may also be
required to limit flashing current. Typically flashing current is limited to approximately 50% of the no-
load exciter field current. An internal blocking diode (CR9) in series with the regulator A- terminal
prevents the regulator output from flowing into the flashing source.
The following paragraphs describe the procedures to be followed to operate two or more generator
sets in parallel. In order to insure proper parallel operation, the following requirements must be met:
(1) The voltage regulating systems must cause the generators to share the total KVAR load.
(2) The speed governing system must make the generators share the total kW load.
a.
Preliminary Instructions
.
(1) It is recommended, before proceeding, that the operation of the components in (and
external to) the regulator which facilitates parallel operation be reviewed (paragraph 2-3).
(2) It is essential that the paralleling signal at terminals 1 and 2 of the regulator, have the proper
phase relationship with that of the sensing voltages at terminals E1, (E2 must be connected
on 3 phase models), and E3. Verify the connections to these terminals are made exactly as
shown in Figures 3-4 and 3-5. If reactive differential (cross-current) compensation is
desired, the paralleling CT's must be connected as described in paragraph 2-4b. A CT
must be selected which will furnish 3 to 5 amperes at rated generator load current.
(3) Prior to operation, the slide adjustment of resistor R25 (on all regulators) should be set to
identical positions, near the end of R25 (farthest from the terminal strip). This adjustment
will provide maximum reactive droop compensation (droop) signal.
b. Preliminary Operation .
(1) Before attempting to parallel two or more generator sets, it is recommended individual sets
be tested to verify that the paralleling features, function properly. The following test may be
used:
4-7. FIELD FLASHING
CAUTION
The flashing source cannot be grounded unless a power isolation
transformer is used.
4-8. PARALLEL OPERATION