GE Multilin 469 Instruction Manual page 306

7.3.5 Short Circuit Test
7–14
S2 SYSTEM SETUP VOLTAGE SENSING
S2 SYSTEM SETUP POWER SYSTEM
S9 VOLTAGE ELEMENTS
S9 VOLTAGE ELEMENTS
Apply voltages as per the table below.
Verify the 469 operation on voltage phase reversal.
APPLIED VOLTAGE
Va = 120 V ∠0°
Vb = 120 V ∠120°
Vc = 120 V ∠240°
Va = 120 V ∠0°
Vb = 120 V ∠240°
Vc = 120 V ∠120°
The 469 specification for short circuit timing is +50 ms. The pickup accuracy is as per the
phase current inputs. Perform the steps below to verify the performance of the short circuit
element.
Alter the following settings:
S2 SYSTEM SETUP CURRENT SENSING
S6 CURRENT ELEMENTS
S6 CURRENT ELEMENTS
S6 CURRENT ELEMENTS
CT"
S6 CURRENT ELEMENTS
Inject current as per the table below, resetting the unit after each trip by
pressing the
Pre-trip values may be viewed by pressing
INJECTED CURRENT
5 A UNIT
30 A 6 A
40 A 8 A
50 A 10 A
VT CONNECTION TYPE:
SYSTEM PHASE SEQUENCE:
PHASE REVERSAL PHASE REVERSAL TRIP:
PHASE REVERSAL ASSIGN TRIP RELAYS:
EXPECTED RESULT
8
NO TRIP
4
PHASE REVERSAL
TRIP
8
4
PHASE CT PRIMARY:
SHORT CIRCUIT TRIP SHORT CIRCUIT TRIP:
SHORT CIRCUIT TRIP ASSIGN TRIP RELAYS:
SHORT CIRCUIT TRIP SHORT CIRCUIT TRIP PICKUP:
SHORT CIRCUIT TRIP INTENTIONAL S/C DELAY:
key, and verify timing accuracy.
RESET
EXPECTED TIME
TO TRIP
1 A UNIT
< 50 ms
< 50 ms
< 50 ms
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 7: TESTING
"Wye" or "Delta"
"ABC"
"Latched"
"Trip"
OBSERVED RESULT
8
NO TRIP
4
PHASE REVERSAL
TRIP
"1000"
"On"
"Trip"
"5.0 ×
"0"
after each trip.
NEXT
MEASURED TIME
TO TRIP