GE 750 User Manual

6-
8
750/760 Feeder Management Relay GE Power Management
6.3 A2 METERING 6 ACTUAL VALUES
6
6.3 A2 METERING 6.3.1 DESCRIPTION
The relay measures all RMS currents and voltages, frequency, and an auxiliary analog input. Other values like
average & neutral current, average line & phase voltage, symmetrical components, frequency decay rate, syn-
chrocheck delta, power factor, power (real, reactive, apparent), energy (real, reactive), running & maximum
demands (current, real power, reactive power, apparent power), and analog input rate of change are derived.
All quantities are recalculated every power system cycle and perform protection and monitoring functions. Dis-
played metered quantities are updated approximately 3 times a second for readability. All phasors and sym-
metrical components are referenced to the A-N voltage phasor for wye-connected VTs; to the A-B voltage
phasor for delta-connected VTs; or to the phase A current phasor when no voltage signals are present.
6.3.2 CURRENT
Phase current magnitudes, phasors, and sequence components are displayed as shown below.
■ CURRENT
■ [ENTER] for more
The Current actual values path is:
\ ACTUAL VALUES \ A2 METERING \ CURRENT
A: 0 B: 0
C: 0 Amps
Displays the RMS magnitudes of phase A, B, and C currents together in one
message.
% OF LOAD-TO-TRIP:
0 %
Displays the ratio of highest phase current to lowest overcurrent pickup level.
AVERAGE CURRENT:
0 A
Displays the calculated average of the phase A, B, and C RMS currents.
PHASE A CURRENT:
0 A 0° Lag
Displays the measured phase A current RMS phasor
PHASE B CURRENT:
0 A 0° Lag
Displays the measured phase B current RMS phasor
PHASE C CURRENT:
0 A 0° Lag
Displays the measured phase C current RMS phasor
NEUTRAL CURRENT:
0 A 0° Lag
Displays the calculated neutral current RMS phasor:
GROUND CURRENT:
0 A 0° Lag
Displays the measured ground current RMS phasor.
SENSTV GND CURRENT:
0.00 A 0° Lag
Displays the measures sensitive ground current RMS phasor.
POS SEQ CURRENT:
0 A 0° Lag
Displays the calculated positive sequence current RMS phasor.
I
avg
I
a
I
b
I
c
++
()
3
---------------------------------------=
3I
0
I
a
I
b
I
c
++=
I
a1
I
a
aI
b
a
2
I
c
++
3
------------------------------------
for ABC phase sequence =
I
a1
I
a
a
2
I
b
aI
c
++
3
------------------------------------
for ACB phase sequence=

GE 750 Specifications

General

Brand	GE
Model	750
Category	Relays
Language	English