Table of Contents
Advertisement
6.3 A2 METERING
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.
S HARMONIC DERATING
S [ENTER] for more
W1 HARMONIC DERATING
FACTOR: 1.00
W2 HARMONIC DERATING
FACTOR: 1.00
W3 HARMONIC DERATING
FACTOR: 1.00
S FREQUENCY
S [ENTER] for more
SYSTEM FREQUENCY:
0.00 Hz
6
FREQUENCY DECAY
RATE: 0.00 Hz/s
S TAP CHANGER
S [ENTER] for more
TAP CHANGER
POSITION: n/a
6-8
This message indicates the start of the Harmonic Derating Factor actual
values of page A2. To view these actual values press
key to return to the Harmonic Content sub-heading or press
the next section.
This message displays the harmonic derating factor for Winding 1.
This message displays the harmonic derating factor for Winding 2.
This message displays the harmonic derating factor for Winding 3.
This message indicates the start of the Frequency actual values. To view
these actual values press
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.
This message displays the frequency decay rate. This actual value can only
be calculated if system frequency can be calculated.
This message indicates the start of the Tap Changer actual values. To view
these actual values press
This message displays the actual tap position. If tap position sensing is
disabled, n/a will be displayed.
745 Transformer Management Relay
6 ACTUAL VALUES
or press
for the next section.
E N TE R
M E SSA G E
or press
for the next section.
E N TE R
M E SSA G E
GE Power Management
; press
E N TE R
E S CA P E
to go to
A CT U A L
6.3.4 FREQUENCY
6.3.5 TAP CHANGER
Advertisement
Table of Contents
