GE 745 TRANSFORMER MANAGEMENT RELAY User Manual

6-8 745 Transformer Management Relay GE Power Management
6.3 A2 METERING 6 ACTUAL VALUES
6
c) HARMONIC DERATING FACTOR
The Harmonic Derating Factor for each of the windings shows the effect of nonsinusoidal load currents on
power transformer’s rated full load current. The calculations are based on ANSI/IEEE standard C57.110-1986.
6.3.4 FREQUENCY
6.3.5 TAP CHANGER
y HARMONIC DERATING
y [ENTER] for more
This message indicates the start of the Harmonic Derating Factor actual
values of page A2. To view these actual values press ; press
key to return to the Harmonic Content sub-heading or press to go to
the next section.
W1 HARMONIC DERATING
FACTOR: 1.00
This message displays the harmonic derating factor for Winding 1.
W2 HARMONIC DERATING
FACTOR: 1.00
This message displays the harmonic derating factor for Winding 2.
W3 HARMONIC DERATING
FACTOR: 1.00
This message displays the harmonic derating factor for Winding 3.
y FREQUENCY
y [ENTER] for more
This message indicates the start of the Frequency actual values. To view
these actual values press or press for the next section.
SYSTEM FREQUENCY:
0.00 Hz
This message displays the system frequency. Frequency is calculated from
the voltage input provided that the voltage sensing is enabled and the
injected voltage is above 50% of VT. If these criteria are not satisfied, then
the system frequency is determined from Winding 1 phase A current
provided that it is above 0.05
×
CT. If frequency still cannot be calculated,
0.00 is displayed, though the sampling rate is then set for the nominal
frequency set under
S2 SYSTEM SETUP / TRANSFORMER
.
FREQUENCY DECAY
RATE: 0.00 Hz/s
This message displays the frequency decay rate. This actual value can only
be calculated if system frequency can be calculated.
y TAP CHANGER
y [ENTER] for more
This message indicates the start of the Tap Changer actual values. To view
these actual values press or press for the next section.
TAP CHANGER
POSITION: n/a
This message displays the actual tap position. If tap position sensing is
disabled, n/a will be displayed.
ENTER ESCAPE
ACTUAL
ENTER
MESSAGE
ENTER
MESSAGE

GE 745 TRANSFORMER MANAGEMENT RELAY Specifications

General

Brand	GE
Model	745 TRANSFORMER MANAGEMENT RELAY
Category	Relays
Language	English