GE 469 Instruction Manual page 312

7.3.5 Short Circuit Test
7–14
 Alter the following settings:

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
 
SHORT CIRCUIT TRIP
 
SHORT CIRCUIT TRIP
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"
ASSIGN TRIP RELAYS:
SHORT CIRCUIT TRIP PICKUP:
"0"
INTENTIONAL S/C DELAY:
after each trip.
NEXT
MEASURED TIME
TO TRIP
"5.0 ×