S2 System Setup
745
Transformer Management Relay
Se
tpoints
http://www.GEindustrial.com/multilin
5–30
GE Multilin
S2 System Setup
Description
This group of setpoints is critical for the protection features to operate correctly.
When the relay is ordered, the phase and ground CT inputs must be specified as
either 5 A or 1 A. The characteristics of the equipment installed on the system are
entered on this page. This includes information on the transformer type, CTs, VT,
ambient temperature sensor, onload tap changer, demand metering, analog outputs
and analog input.
Transformer
PATH: SETPOINTS
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S2 SYSTEM SETUP
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TRANSFORMER
To provide accurate and effective transformer protection, the parameters of both the
transformer and the system configuration must be supplied to the 745 relay.
•
NOMINAL FREQUENCY
: Enter the nominal frequency of the power system.
This setpoint is used to determine the sampling rate in the absence of a
measurable frequency. Frequency is measured from the VT input when
available. If the VT input is not available, current from Winding 1 Phase A is
used.
•
FREQUENCY TRACKING
: In situations where the AC signals contain significant
amount of sub-harmonic components, it may be necessary to disable frequency
tracking.
•
PHASE SEQUENCE
: Enter the phase sequence of the power system. Systems
with an ACB phase sequence require special considerations. See
on page 5–7 for details.
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TRANSFORMER
[
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]
NOMINAL FREQUENCY:
60 Hz
Range: 50 Hz, 60 Hz
MESSAGE
FREQUENCY TRACKING:
Enabled
Range: Enabled, Disabled
MESSAGE
PHASE SEQUENCE:
ABC
Range: ABC, ACB
MESSAGE
TRANSFORMER TYPE:
Y/d30°
Range: Refer to
Transformer Types
on page 5–11
MESSAGE
LOAD LOSS AT RATED
LOAD:
1250 kW
Range: 0 to 20000 kW in steps of 1
(Auto-ranging; see table below)
MESSAGE
LOW VOLTAGE WINDING
RATING: Above 5 kV
Range: Above 5 kV, 1 kV to 5 kV, Below
1 kV
MESSAGE
RATED WINDING TEMP
RISE: 65°C (oil)
Range: 65°C (oil), 55°C (oil), 80°C (dry),
115°C (dry), 150°C (dry)
MESSAGE
NO-LOAD LOSS:
125.0 kW
Range: 0.1 to 2000.0 kW in steps of 0.1
(see description below)
MESSAGE
TYPE OF COOLING:
OA
Range: FA, OA, Directed FOA, FOW,
Non-Directed FOA/FOW
MESSAGE
RATED TOP OIL RISE
OVER AMBIENT:
10°C
Range: 1 to 200°C in steps of 1
MESSAGE
XFMR THRML CAPACITY:
1.00 kWh/°C
Range: 0.00 to 200.00 kWh/°C in steps
of 0.01
MESSAGE
WINDING TIME CONST:
2.00 min.
Range: 0.25 to 15.00 min. in steps of
0.01
MESSAGE
SET ACCUMULATED LOSS
OF LIFE:
0 x 10h
Range: 0 to 20000 x 10h in steps of 1
Summary of Contents for Multilin 745
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