Manual 26174
EGCP-2 Engine Generator Control Package
Woodward
23
42
43
44
45
46
47
A PHASE PT
B PHASE PT
C PHASE PT
+
+
+
-
-
-
EGCP-2
VIS-054b
00-06-19
A
B
C
Figure 3-5. Three Wire Delta PT Connections for EGCP-2
42
43
44
45
46
47
+
+
+
EGCP-2
VIS-055a
00-10-17
A
B
C
N
N
A
N
B
N
C
N
N
N
Figure 3-6. Four Wire Wye PT Connections
Utility (Mains) and Plant Bus PT Input Wiring
The EGCP-2 utilizes one PT input to sense both utility tie-line voltage and plant-
bus voltage. This PT input must be the same configuration as the generator PT
input. The potential transformer should be the same ratio as the generator PT
input. Two Relay outputs are used by the EGCP-2 to select which voltage source
to monitor, depending upon the state of the control. The EGCP-2’s control logic is
set up to monitor the utility tie voltage during normal operation and local bus
voltage when sensing for a dead bus condition or synchronizing the generator to
the local bus. Refer to Figures 3-7 and 3-8, for required input wiring
configurations. This type of configuration allows the EGCP-2 to perform a break-
before-make relay action when switching between voltage sources to assure that
the utility PT and Bus PT never are connected.