GE 745 - 5.4.9 Analog Input; 5.4.10 Demand Metering

CHAPTER 5: SETPOINTS S2 SYSTEM SETUP
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 5–41
5.4.9 Analog Input
PATH: SETPOINTS  S2 SYSTEM SETUP  ANALOG INPUT
The 745 provides a general purpose DC current input for use in monitoring any external
parameter. Any standard transducer output may be connected to the analog input for
monitoring.
• ANALOG INPUT NAME: Press ENTER to begin editing the name of the analog input.
The text may be changed from “Analog Input” one character at a time, using the
VALUE keys. Press the ENTER key to store the edit and advance to the next character
position. This name will appear in the actual value message A2 METERING

ANALOG INPUT.
• ANALOG INPUT UNITS: Enter the units of the quantity being read by editing the text as
described above. The six characters entered will be displayed instead of “Units”
wherever the analog input units are displayed.
• ANALOG INPUT RANGE: Select the current output range of the transducer that is
connected to the analog input. The units are defined by the
ANALOG INPUT UNITS
setpoint.
• ANALOG INPUT MINIMUM/MAXIMUM: Enter the value of the quantity measured
which corresponds to the minimum/maximum output value of the transducer. The
units are defined by the
ANALOG INPUT UNITS setpoint.
5.4.10 Demand Metering
PATH: SETPOINTS  S2 SYSTEM SETUP  DEMAND METERING
This section assigns the demand setpoints for monitoring current demand on all three
phases of each windings. Current demand on the 745 is performed one of three ways:
thermal, rolling demand, or block interval.
• CURRENT DEMAND METER TYPE: Select the method to be used for the current
demand metering.
 ANALOG INPUT [] ANALOG INPUT NAME:
Analog Input
Range: 18 alphanumeric characters
MESSAGE
ANALOG INPUT UNITS:
μA
Range: 6 alphanumeric characters
MESSAGE
ANALOG INPUT RANGE:
0-1 mA
Range: 0-1 mA, 0-5 mA, 4-20 mA, 0-20
mA.
MESSAGE
ANALOG INPUT MINIMUM
VA L U E : 0 μA
Range: 0 to 65000 in steps of 1
MESSAGE
ANALOG INPUT MAXIMUM
VALUE: 1000 μA
Range: 0 to 65000 in steps of 1
 DEMAND METERING [] CURRENT DEMAND METER
TYPE: Thermal
Range: Thermal, Block Interval, Rolling
Demand
MESSAGE
THERMAL 90% RESPONSE
TIME: 15 min.
Range: 5, 10, 15, 20, 25, 30, 60 min.
MESSAGE
TIME INTERVAL:
20 min.
Range: 5, 10, 15, 20, 25, 30, 60 min.
(see note below)