Power Measurement Test; Reactive Power Accuracy - GE Multilin 489 Instruction Manual

CHAPTER 7: TESTING
7.3.2

Power Measurement Test

Injected Current / Applied Voltage
(Ia is the reference vector)
1 A UNIT
Ia = 1 A∠0°
Ib = 1 A∠120° lag
Ic = 1 A∠240° lag
Va = 120 V∠342° lag
Vb = 120 V∠102° lag
Vc = 120 V∠222° lag
Ia = 1 A∠0°
Ib = 1 A∠120° lag
Ic = 1 A∠240° lag
Va = 120 V∠288° lag
Vb = 120 V∠48° lag
Vc = 120 V∠168° lag
7.3.3

Reactive Power Accuracy

489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
The specification for reactive and apparent power is ± 1% of
at I < 2 × CT. Perform the steps below to verify accuracy.
scale avg
In the
S2 SYSTEM SETUP
PHASE CT PRIMARY:
In the
S2 SYSTEM SETUP
VT CONNECTION TYPE:
VOLTAGE TRANSFORMER RATIO:
Inject current and apply voltage as per the table below.
Verify accuracy of the measured values.
View the measured values in the
METERING
5 A UNIT Expected
Ia = 5 A∠0°
Ib = 5 A∠120° lag
Ic = 5 A∠240° lag
+3424 kW
Ia = 120 V∠342° lag
Vb = 120 V∠102° lag
Vc = 120 V∠222° lag
Ia = 5 A∠0°
Ib = 5 A∠120° lag
Ic = 5 A∠240° lag
+3424 kvar
Va = 120 V∠288° lag
Vb = 120 V∠48° lag
Vc = 120 V∠168° lag
The specification for reactive power is ±1% of
< 2 × CT. Perform the steps below to verify accuracy and trip element.
I
avg
In the
S2 SYSTEM SETUP
PHASE CT PRIMARY:
In the
S2 SYSTEM SETUP
VT CONNECTION TYPE:
VOLTAGE TRANSFORMER RATIO:
In the
S2 SYSTEM SETUP
GENERATOR RATED MVA:
GENERATOR RATED POWER FACTOR:
GENERATOR VOLTAGE PHASE-PHASE:
The rated reactive power is
Alter the following reactive power setpoints in the
REACTIVE POWER
CURRENT SENSING
"1000"
VOLTAGE SENSING
"Wye"
"10.00:1"
A2 METERING DATA
menu:
Power Quantity
Tolerance Measured
3355 to
3493 kW
3355 to
3493 kvar
3 × 2 × CT × VT
CURRENT SENSING
"5000"
VOLTAGE SENSING
"Wye"
"100:1"
GEN. PARAMETERS
"100"
"0.85"
"12000"
1
–
( ( ) ) ±
100 sin cos 0.85
=
menu:
3 × 2 × CT × VT × VT
ratio full-
menu, set:
menu, set:
POWER
Power Factor
Expected Measured
0.95 lag
0.31 lag
× VT at
ratio full scale
menu, set:
menu, set:
menu, set
52.7 Mvar .
S7 POWER ELEMENTS
7–13