Woodward 9907-252, Инструкция по установке и эксплуатации, Страница: 13 / 36

Manual 02035 Load Sharing Module
Woodward 9
Generator Connections
Use 1 mm² (18 AWG) or larger wire for all PT and CT connections.
The spacing between the lugs on terminals 3 and 4 must be 6.5 mm
(0.256 inch) or greater to comply with the European Union Low
Voltage Directive (see Figure 1-4). The lugs must have insulated
sleeves.
Connections from the potential transformers and current
transformers must be made correctly in regard to the three phases
for the Load Sharing Module to operate correctly. Sorting out the
three phases at the module is tedious and requires numerous
generator starts and stops. If at all possible, make sure that the
wiring is correctly done at the time of installation and the phases
correctly and permanently identified at the generator and at the
module.
Connect the PT output from the A leg to terminal 1. Connect the PT output from
the B leg to terminal 2. Connect the PT output from the C leg to terminal 3. Size
the potential transformers to produce 100–240 Vac.
Current Transformers
Power source current transformers should be sized to produce 5 A secondary
current with maximum generator current (3–7 A secondary current at full load is
acceptable). CT burden is 0.1 VA. To prevent lethal high voltage from developing
on leads to the terminals, the Load Sharing Module contains internal burden
which must be connected across the power source current transformers
whenever the unit is running. Ammeters may be installed on the leads from the
current transformers.
Connect phase “A” CT to terminals 4 and 5. Connect phase “B” CT to terminals 6
and 7. Connect Phase “C” CT to terminals 8 and 9. Observe correct phasing as
shown in the plant wiring diagram, Figure 1-4.
Load Sharing Lines, Droop, and Auxiliary Contacts
The droop contact for selecting droop or isochronous operation is wired in series
with the circuit breaker auxiliary contact between terminals 13 and 14. When both
the droop contact and circuit breaker auxiliary contact are closed, the Load
Sharing Module is in the isochronous load sharing mode. In this mode the
internal load-sharing-line relay is energized, the droop signal is disabled, and the
load matching circuit is connected to the load-sharing lines, permitting
isochronous load sharing.
The Load Sharing Module is in the droop mode when EITHER the droop contact
or the circuit breaker auxiliary contact is open. If the droop contact is open, the
Load Sharing Module remains in the droop mode even when the circuit breaker
auxiliary contact is closed. If droop is not desired when the auxiliary contact is
open, turn the droop potentiometer fully counterclockwise.
Use a single pole, single-throw switch with a 0.1 A minimum rating for the “open
for droop” switch.