7. TESTING
ADDITIONAL FUNCTIONAL TESTING
7-13
7.3.5
SHORT CIRCUIT TEST
The SR469 specification for short circuit timing is +40ms or
±
0.5% of total time. The pickup accuracy is as per the phase current inputs. Per-
form the steps below to verify the performance of the short circuit element.
1.
Alter the following setpoints:
SETPOINT S2:SYSTEM SETUP\CURRENT SENSING\PHASE CT PRIMARY: 1000
SETPOINT S6:CURRENT ELEMENTS\SHORT CIRCUIT TRIP\SHORT CIRCUIT TRIP: On
SETPOINT S6:CURRENT ELEMENTS\SHORT CIRCUIT TRIP\ASSIGN TRIP RELAYS: Trip
SETPOINT S6:CURRENT ELEMENTS\SHORT CIRCUIT TRIP\SHORT CIRCUIT TRIP PICKUP: 5.0 x CT
SETPOINT S6:CURRENT ELEMENTS\SHORT CIRCUIT TRIP\INTENTIONAL S/C DELAY: 0
2.
Inject current as per the table below, resetting the unit after each trip by pressing the [RESET] key, and verify timing accuracy. Pre-trip
values may be viewed by pressing the [NEXT] after each trip.
Table 7-18 SHORT CIRCUIT TIMING
INJECTED
CURRENT
5A UNIT
(A)
INJECTED
CURRENT
1A UNIT
(A)
EXPECTED
TIME TO TRIP
(ms)
MEASURED
TIME TO TRIP
(ms)
30
6
<40
40
8
<40
50
10
<40
Summary of Contents for SR469
Page 7: ......
Page 19: ...2 INSTALLATION MECHANICAL 2 5 2 1 5 TERMINAL LOCATIONS Figure 2 11 TERMINAL LAYOUT...
Page 21: ...2 INSTALLATION ELECTRICAL 2 7 Figure 2 12 TYPICAL WIRING DIAGRAM...
Page 32: ...ELECTRICAL 2 INSTALLATION 2 18 2 2 14 TYPICAL 2 SPEED MOTOR WIRING...
Page 39: ...OVERVIEW 3 SR469 OPERATION 3 6 yy SETPOINTS yy S1 SR469 SETUP...
Page 104: ...4 SETPOINT PROGRAMMING S11 MONITORING 4 65 Figure 4 24 TRIP COIL SUPERVISION...
Page 113: ...S12 ANALOG I O 4 SETPOINT PROGRAMMING 4 74...
Page 244: ...8 469PC PROGRAM WAVEFORM CAPTURE 8 13 Figure 8 11 WAVEFORM CAPTURE...
