GE Multilin 745

A2 Metering745
Transformer Management Relay
Actual Values
http://www.GEindustrial.com/multilin
6–10
GE Multilin
Frequency PATH: ACTUAL VALUES !" A2 METERING !" FREQUENCY
The SYSTEM FREQUENCY is calculated from the voltage input provided that voltage
sensing is enabled and the injected voltage is above 50% of VT. If these criteria are
not satisfied, then it is determined from Winding 1 Phase A current provided that it
is above 0.05 × CT. If frequency still cannot be calculated, “0.00 Hz” is displayed,
though the sampling rate is then set for the
S2 SYSTEM SETUP ! TRANSFORMER !
NOMINAL FREQUENCY setpoint. The FREQUENCY DECAY RATE can only be calculated if
system frequency can be calculated.
Tap Changer PATH: ACTUAL VALUES ! A2 METERING !" TAP CHANGER
This message displays the actual tap position. If tap position sensing is disabled, “n/
a” will be displayed.
Voltage PATH: ACTUAL VALUES !" A2 METERING !" VOLTAGE
For phase-to-neutral input voltages, the SYSTEM LINE-TO-LINE VOLTAGE displays its
line-to-line equivalent.
Demand a) Main Menu
PATH: ACTUAL VALUES !" A2 METERING !" HARMONIC CONTENT
Current demand is measured on each phase of each monitored winding. These
parameters can be monitored to reduce supplier demand penalties or for statistical
metering purposes. The calculated demand is based on the
S2 SYSTEM SETUP !"
DEMAND METERING ! CURRENT DEMAND METER TYPE setpoint value. For each quantity,
the 745 displays the demand over the most recent demand time interval, the
maximum demand since the last date that the demand data was reset, and the time
and date stamp of this maximum value.
! FREQUENCY [!] SYSTEM FREQUENCY:
0.00 Hz
MESSAGE
FREQUENCY DECAY
RATE: 0.00 Hz/s
! TAP CHANGER [!] TAP CHANGER
POSITION: n/a
! VOLTAGE [!] SYSTEM LINE-TO-LINE
VOLTAGE: 0.00 kV
MESSAGE
VOLTS-PER-HERTZ:
0.00 V/Hz
MESSAGE
LINE-NTRL VOLTAGE:
0.00 kV at 0° Lag
! DEMAND [!] ! DEMAND DATA [!]
See page 6–11.
MESSAGE
! W1 CURRENT [!]
DEMAND
See page 6–11.
MESSAGE
! W2 CURRENT [!]
DEMAND
See page 6–11.
MESSAGE
! W3 CURRENT [!]
DEMAND
See page 6–11.