EGCP-2 Engine Generator Control Package
Manual 26174
30
Woodward
Current Transformer (CT) Inputs
Current Transformers (CTs) are utilized with the EGCP-2 control to allow high
currents to be stepped down to a safe level for the EGCP-2 input circuitry. The
EGCP-2 senses generator current via external current transformers. The “Amps
per phase” display on the Generator Status screen:
1. does not display negative current
2. Must register at least 0.2 A on CT input before displaying any current
Refer to Figure 3-11 for CT input wiring schematic.
Current Transformer Input Ratings
For optimum control, the Current Transformers (CTs) should be sized at 100 to
125% of the generators rated current.
Example 1:
Generator rated for 2000 amps per phase at 100% load, rated power factor.
CT Ratio
100%
2000:5
the EGCP-2 will see 5 amps at 2000 generator amps
125%
2500:5
the EGCP-2 will see 4 amps at 2000 generator amps
Example 2:
Generator rated for 150 amps per phase at 100% load, rated power factor.
CT
Ratio
100%
150:5
the EGCP-2 will see 5 amps at 150 generator amps
125%
188:5
the EGCP-2 will see 4 amps at 150 generator amps
Current Transformer Input Ratings
Number of Inputs:
3 Generator CTs
Nominal Current Ratings:
0–5 A rms
Maximum Current Rating:
7 A rms for 1 minute
Input Burden:
1.25 VA
Input Frequency Range:
40–70 Hz
When conducting external Protective Relay testing, if the EGCP-2 CT
inputs could measure greater than 7 A rms, bypass the EGCP-2 CT
inputs.
A
B
C
0-5 A
FIELD WIRING EGCP-2
VIS-049b
00-06-19
90
A PHASE CT
89
(.050 OHMS)
92
91
94
93
B PHASE CT
(.050 OHMS)
C PHASE CT
(.050 OHMS)
(+)
(-)
(+)
(-)
(+)
(-)
Figure 3-11. Current Transfer Wiring Diagram for EGCP-2