GE SPM Series, Инструкция по эксплуатации

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5-
6
SPM Synchronous Motor Protection & Control GE Power Management
5.2 SETPOINTS MENU 5 SETPOINTS
5
5.2.13 DIRECT CURRENT CT PRIMARY RATING
FUNCTION:
The primary ampere rating (not the ratio) stamped on the DC Current Transformer (DCCT) is entered here if
one turn is passed through the DCCT window. If more than one turn is used, divide the DCCT primary ampere
rating by the number of turns and enter this number here.
MOTOR TYPE:
Collector-Ring and Brushless
NOTE:
The DCCT is available as a separate accessory in the PG2SPM or PG4SPM packages along with the neces-
sary CM (calibration module). These packages are required for overtemperature or current loss protection.
The value entered here affects the valid range of the
HIGH FIELD
/
HI EXC FIELD
setpoint.
APPLICATION:
The standard DCCT200 (from PG2SPM package) has a rated 200 A primary and a 50 mA secondary (4000:1
ratio). The DCCT terminals connect to CM terminals 7 and 8 (the polarity not important). Multiple turns of field
cable through the DCCT window may be required to obtain the proper effective CT ratio. Determine your motor
rated field (or exciter field) current and use the following table to determine the number of field cable turns
through the DCCT and effective rating to enter as the
DCCT PRIM
setpoint.
DC CT PRIM: 5 A
ENTER to modify
Range: 5 to 1000 A
Step: 1
Table 5–1: DCCT SETUP
DC FIELD AMPS
RANGE
RECOMMENDED
DCCT CABLE SIZE
NUMBER OF
TURNS
DCCT PRIM
SETPOINT
1 to 3 A 18 AWG 40 5 A
3.01 to 8 A 16 AWG 20 10 A
8.01 to 15 A 10 AWG 10 20 A
15.01 to 24 A 8 AWG 6 33 A
24.01 to 34 A 6 AWG 4 50 A
34.01 to 60 A 4 AWG 2 100 A
60.01 to 75 A 2 AWG 2 100 A
75.01 to 100 A 2 AWG 1 200 A
100.1 to 133 A 1/0 AWG 1 200 A
133.1 to 154 A 2/0 AWG 1 200 A