S2 System Setup
745
Transformer Management Relay
Se
tpoints
http://www.GEindustrial.com/multilin
5–36
GE Multilin
Analog Input
PATH: SETPOINTS
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S2 SYSTEM SETUP
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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 6 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.
Demand Metering
PATH: SETPOINTS
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S2 SYSTEM SETUP
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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.
Select “Thermal” to emulate the action of an analog peak-recording thermal
demand meter. The 745 measures the current on each phase every second, and
assumes the circuit quantity remains at this value until updated by the next
measurement. It calculates the ‘thermal demand equivalent’ as follows:
(EQ 5.3)
where
d
= demand after applying input for time
t
(in minutes)
D
= input quantity (constant)
k
=
!
ANALOG INPUT
[
!
]
ANALOG INPUT NAME:
Analog Input
Range: 18 alphanumeric characters
MESSAGE
ANALOG INPUT UNITS:
µ
A
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
VALUE:
0
µ
A
Range: 0 to 65000 in steps of 1
MESSAGE
ANALOG INPUT MAXIMUM
VALUE:
1000
µ
A
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)
d t
( )
D
1
e
kt
–
–
(
)
=
2.3
Thermal 90% Response Time
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Summary of Contents for Multilin 745
Page 2: ......
