GE 489 User Manual

7-16 489 Generator Management Relay
GE Power Management
7.3 ADDITIONAL FUNCTIONAL TESTING 7 TESTING
7
7.3.10 VOLTAGE RESTRAINED OVERCURRENT TEST
1. Alter the following setpoints.
S2 SYSTEM SETUP\GEN. PARAMETERS\GENERATOR SETTING:
100 MVA
S2 SYSTEM SETUP\GEN. PARAMETERS\GENERATOR VOLTAGE PHASE-PHASE:
12000
S2 SYSTEM SETUP\VOLTAGE SENSING\VT CONNECTION TYPE:
Open Delta
S2 SYSTEM SETUP\VOLTAGE SENSING\VOLTAGE TRANSFORMER RATIO:
100:1
S5 CURRENT ELEMENTS\OVERCURRENT ALARM\OVERCURRENT ALARM:
Unlatched
S5 CURRENT ELEMENTS\OVERCURRENT ALARM\O/C ALARM LEVEL:
1.10 x FLA
S5 CURRENT ELEMENTS\OVERCURRENT ALARM\OVERCURRENT ALARM DELAY:
2 s
S5 CURRENT ELEMENTS\OVERCURRENT ALARM\O/C ALARM EVENTS:
On
S5 CURRENT ELEMENTS\PHASE OVERCURRENT\PHASE OVERCURRENT TRIP:
Latched
S5 CURRENT ELEMENTS\PHASE OVERCURRENT\ENABLE VOLTAGE RESTRAINT:
Yes
S5 CURRENT ELEMENTS\PHASE OVERCURRENT\PHASE O/C PICKUP:
1.5 x CT
S5 CURRENT ELEMENTS\PHASE OVERCURRENT\CURVE SHAPE:
ANSI Extremely Inv.
S5 CURRENT ELEMENTS\PHASE OVERCURRENT\O/C CURVE MULTIPLIER:
2.00
S5 CURRENT ELEMENTS\PHASE OVERCURRENT\O/C CURVE RESET:
Instantaneous
2. The trip time for the extremely inverse ANSI curve is given as:
where: M =
O/C CURVE MULTIPLIER
setpoint, I = input current, I
p
=
PHASE O/C PICKUP
setpoint
A , B , C , D , E = curve constants; A = 0.0399, B = 0.2294, C = 0.5000, D = 3.0094, E = 0.7222
K = voltage restrained multiplier <optional>
The voltage restrained multiplier is calculated as and has a range of 0.1 to 0.9.
3. Using Figure 7–4: SECONDARY INJECTION TEST SETUP #3 on page 7–15, inject current and apply voltage as per
the table below. Verify the alarm/trip elements and view the event records in
A5 EVENT RECORD
4
activated;
8
Not Activated
CURRENT/VOLTAGE (5 A UNIT) ALARM TRIP TRIP DELAY
CURRENT VOLTAGE
EXPECTED OBSERVED DELAY EXPECTED OBSERVED EXPECTED OBSERVED
Ian = 5 A
∠
0
°
Ibn = 5 A
∠
120
°
lag
Icn = 5 A
∠
240
°
lag
Vab = 120 V
∠
0
°
lag
Vbc = 120 V
∠
120
°
lag
Vca = 120 V
∠
240
°
lag
8
N/A
8
N/A N/A
Ian = 6 A
∠
0
°
Ibn = 6 A
∠
120
°
lag
Icn = 6 A
∠
240
°
lag
Vab = 120 V
∠
0
°
Vbc = 120 V
∠
120
°
lag
Vca = 120 V
∠
240
°
lag
48
N/A N/A
Ian = 10 A
∠
0
°
Ibn = 10 A
∠
120
°
lag
Icn = 10 A
∠
240
°
lag
Vab = 120 V
∠
0
°
Vbc = 120 V
∠
120
°
lag
Vca = 120 V
∠
240
°
lag
44
11.8 sec.
Ian = 10 A
∠
0
°
Ibn = 10 A
∠
120
°
lag
Icn = 10 A
∠
240
°
lag
Vab = 100 V
∠
0
°
Vbc = 100 V
∠
120
°
lag
Vca = 100 V
∠
240
°
lag
44
6.6 sec.
Ian = 10 A
∠
0
°
Ibn = 10 A
∠
120
°
lag
Icn = 10 A
∠
240
°
lag
Vab = 60 V
∠
0
°
Vbc = 60 V
∠
120
°
lag
Vca = 60 V
∠
240
°
lag
44
1.7 sec.
Time to Trip M
A
B
I
K
〈〉
I
p
×
-------------------- C –
------------------------------
D
I
K
〈〉
I
p
×
-------------------- C –


2
---------------------------------------
E
I
K
〈〉
I
p
×
-------------------- C –


3
---------------------------------------++ +





×
=
K
phase-to-phase voltage
rated phase-to-phase voltage
------------------------------------------------------------------------------=

GE 489 Specifications

General

Brand	GE
Model	489
Category	Relays
Language	English