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GE Multilin 489 Generator Management Relay 7-11
7 TESTING 7.3 ADDITIONAL FUNCTIONAL TESTS
7
7.3.3 REACTIVE POWER ACCURACY
The specification for reactive power is ±1% of × 2 × CT × VT × VT
full scale
at I
avg
< 2 × CT. Perform the steps below to
verify accuracy and trip element.
1. Alter the following system setpoints:
S2 SYSTEM SETUP Ö CURRENT SENSING Ö PHASE CT PRIMARY: "5000"
S2 SYSTEM SETUP ÖØ VOLTAGE SENSING Ö VT CONNECTION TYPE: "Wye"
S2 SYSTEM SETUP ÖØ VOLTAGE SENSING ÖØ VOLTAGE TRANSFORMER RATIO: "100:1"
S2 SYSTEM SETUP ÖØ GEN. PARAMETERS Ö GENERATOR RATED MVA: "100"
S2 SYSTEM SETUP ÖØ GEN. PARAMETERS ÖØ GENERATOR RATED POWER FACTOR: "0.85"
S2 SYSTEM SETUP ÖØ GEN. PARAMETERS ÖØ GENERATOR VOLTAGE PHASE-PHASE: "12000"
The rated reactive power is .
2. Alter the following reactive power setpoints:
S7 POWER ELEMENTS Ö REACTIVE POWER ÖØ REACTIVE POWER ALARM: "Unlatched"
S7 POWER ELEMENTS Ö REACTIVE POWER ÖØ ASSIGN ALARM RELAYS(2-5): "---5"
S7 POWER ELEMENTS Ö REACTIVE POWER ÖØ POSTIVE Mvar ALARM LEVEL: "0.6 x Rated"
S7 POWER ELEMENTS Ö REACTIVE POWER ÖØ NEGATIVE Mvar ALARM LEVEL: "0.6 x Rated"
S7 POWER ELEMENTS Ö REACTIVE POWER ÖØ REACTIVE POWER ALARM DELAY: "5 s"
S7 POWER ELEMENTS Ö REACTIVE POWER ÖØ REACTIVE POWER ALARM EVENT: "On"
S7 POWER ELEMENTS Ö REACTIVE POWER ÖØ REACTIVE POWER TRIP: "Unlatched"
S7 POWER ELEMENTS Ö REACTIVE POWER ÖØ ASSIGN TRIP RELAYS(1-4): "1---"
S7 POWER ELEMENTS Ö REACTIVE POWER ÖØ POSTIVE Mvar TRIP LEVEL: "0.75 x Rated"
S7 POWER ELEMENTS Ö REACTIVE POWER ÖØ NEGATIVE Mvar TRIP LEVEL: "0.75 x Rated"
S7 POWER ELEMENTS Ö REACTIVE POWER ÖØ REACTIVE POWER TRIP DELAY: "10 s"
3. Inject current and apply voltage as per the table below. Verify the alarm/trip elements and the accuracy of the mea-
sured values. View the measured values in:
A2 METERING DATA Ö POWER METERING
4. View the Event Records in A5 EVENT RECORD
CURRENT/
VOLTAGE
MVAR ALARM TRIP
EXPECTED TOLERANCE MEASURED EXPECTED OBSERVED DELAY EXPECTED OBSERVED DELAY
Vab=120V∠0°
Vbc=120V∠120°lag
Vca=120V∠240°lag
Ian=5 A∠10°lag
Ibn=5 A∠130°lag
Icn=5 A∠250°lag
18 13 to 23 N/A N/A
Vab=120V∠0°
Vbc=120V∠120°lag
Vca=120V∠240°lag
Ian=5 A∠340°lag
Ibn=5 A∠100°lag
Icn=5 A∠220°lag
–35 –40 to –30 N/A
Vab=120V∠0°
Vbc=120V∠120°lag
Vca=120V∠240°lag
Ian=5 A∠330°lag
Ibn=5 A∠90°lag
Icn=5 A∠210°lag
–52 –57 to –47
Vab=120V∠0°
Vbc=120V∠120°lag
Vca=120V∠240°lag
Ian=5 A∠30°lag
Ibn=5 A∠150°lag
Icn=5 A∠270°lag
52 47 to 57
: Activated, : Not Activated
3
100 cos
1–
0.85()()sin 52.7 Mvar±=