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745
Transformer Management Relay
Description
Transformer
! TRANSFORMER
5–30
S2 System Setup
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.
PATH: SETPOINTS
!"
S2 SYSTEM SETUP
[!]
NOMINAL FREQUENCY:
60 Hz
FREQUENCY TRACKING:
MESSAGE
Enabled
PHASE SEQUENCE:
MESSAGE
ABC
TRANSFORMER TYPE:
MESSAGE
Y/d30°
LOAD LOSS AT RATED
MESSAGE
LOAD:
LOW VOLTAGE WINDING
MESSAGE
RATING: Above 5 kV
RATED WINDING TEMP
MESSAGE
RISE: 65°C (oil)
NO-LOAD LOSS:
MESSAGE
125.0 kW
TYPE OF COOLING:
MESSAGE
OA
RATED TOP OIL RISE
MESSAGE
OVER AMBIENT:
XFMR THRML CAPACITY:
MESSAGE
WINDING TIME CONST:
MESSAGE
2.00 min.
SET ACCUMULATED LOSS
MESSAGE
OF LIFE:
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 Phase Shifts on
Three-Phase Transformers on page 5–7 for details.
http://www.GEindustrial.com/multilin
!
TRANSFORMER
Range: 50 Hz, 60 Hz
Range: Enabled, Disabled
Range: ABC, ACB
Range: Refer to
Range: 0 to 20000 kW in steps of 1
1250 kW
Range: Above 5 kV, 1 kV to 5 kV, Below
Range: 65°C (oil), 55°C (oil), 80°C (dry),
Range: 0.1 to 2000.0 kW in steps of 0.1
Range: FA, OA, Directed FOA, FOW,
Range: 1 to 200°C in steps of 1
10°C
Range: 0.00 to 200.00 kWh/°C in steps
1.00 kWh/°C
Range: 0.25 to 15.00 min. in steps of
Range: 0 to 20000 x 10h in steps of 1
0 x 10h
S2 System Setup
Transformer Types
on page 5–11
(Auto-ranging; see table below)
1 kV
115°C (dry), 150°C (dry)
(see description below)
Non-Directed FOA/FOW
of 0.01
0.01
GE Multilin
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