Table of Contents
Advertisement
8 COMMISSIONING TESTS
Repeatedly turning the current on and then off should continue to increment the
NUMBER OF RECLOSURE SHOTS
4.
Set the current level so the neutral current is below the
below the
PHASE CURRENT INCREASE
should not change.
5.
Set the current level such that the neutral current is above the
current is below the
value should increment as in Step 3.
EFFECT
Use the following procedure to test Instantaneous Overcurrent Blocking for Autoreclose:
1.
Select the
MAX NUMBER OF RECLOSURE SHOTS
test set to a current level above the pickup of this element, and inject into a phase input. The relay should trip and
reclose 4 times. Turn off the current, reset the relay and close the breaker.
2.
Enable Phase Inst OC 1 Blocking for Reclosure Shot 1. Turn on the current. The relay should trip and reclose once.
The Shot in Effect display should show 1 and the Pickup LED off. Once the
then pickup, trip and reclose until lockout as the fault current is still present. Turn off the current, reset the relay and
close the breaker.
3.
Disable Phase Inst OC 1 Blocking for Reclosure Shot 1, and Enable for Reclosure Shot 2. Turn on the current. Reclo-
sure Shot 2 should not operate, and the Pickup LED will be off. Turn off the current and reset the relay.
4.
Repeat Step 3 using Phase Inst OC 1 Blocking for each of the 4 Reclosure Shot settings.
5.
Repeat Steps 1 through 4 for each Instantaneous OC Blocking setpoint, disabling each instantaneous overcurrent ele-
ment before moving on to the next.
Use the following procedure to test Raised Pickup of TOC Elements for Autoreclose:
1.
Keep the
MAX NUMBER OF RECLOSURE SHOTS
test set to a current level above the pickup of this element. Turn off the current, reset the relay and close the breaker.
2.
In Reclosure Shot 1 settings, select the
the actual current that is being injected. Turn on the current. The relay should trip and reclose 4 times.
3.
In Reclosure Shot 1 settings, select the
the actual current that is being injected. Turn on the current. The relay should trip and reclose once. The Shot in Effect
display should show 1 and the Pickup LED off. Once the
reclose until lockout as the fault current is still present. Turn off the current, reset the relay and close the breaker.
4.
Return
PHASE TIME OC 1 RAISED PICKUP
for Reclosure Shot 2. Turn on the current. Reclosure Shot 2 should not operate, and the Pickup LED will be off. Turn
off the current and reset the relay.
5.
Repeat Step 4 using Phase Time OC 1 Blocking for each of the 4 Reclosure Shot settings.
6.
Repeat Steps 1 through 5 for each
moving on to the next.
The following procedure tests the Select Setpoint Group function for Autoreclose:
1.
Keep the
MAX NUMBER OF RECLOSURE SHOTS
In Setpoint Group 2, set
to "Trip + AR". In Setpoint Group 4, set
element.
2.
For Reclosure Shot 1 settings, set the
Reclosure Shot 2, "Group 4" for Reclosure Shot 3, and "Group 1" for Reclosure Shot 4.
3.
Set the test set to a current level above the pickup of these elements. With the current source off, Reset the relay, and
clear the event recorder.
4.
Turn on the current. The relay will Trip and Autoreclose four times due to the following elements, in order: Phase TOC
1, Phase TOC 2, Phase IOC 1, Phase IOC 2, Phase TOC 1. The event recorder will show this sequence of events.
Turn off the current, and reset the relay.
GE Multilin
Courtesy of NationalSwitchgear.com
, and the Autoreclose scheme will go into lockout.
setpoint. Turn the current on and then off. The
setpoint. Turn the current on and then off. The
PHASE CURRENT INCREASE
to be 4. With
at 4. With the
PHASE TIME OC 1 RAISED PICKUP
PHASE TIME OC 1 RAISED PICKUP
to "0" for Reclosure Shot 1, and set it to a level that is above the actual current
TIME OC RAISED PICKUP
at 4. In Setpoint Group 1, set
PHASE TIME OC 2 FUNCTION
PHASE INST OC 2 FUNCTION
SELECT SETPOINT GROUP
750/760 Feeder Management Relay
AR SHOT NUMBER IN EFFECT
NEUTRAL CURRENT INCREASE
NEUTRAL CURRENT INCREASE
PHASE INST OC 1 FUNCTION
AR RESET TIME
PHASE TIME OC 1 FUNCTION
such that it brings the pickup level just below
such that it brings the pickup level just above
has expired, the relay will then pickup, trip, and
AR RESET TIME
setpoint, disabling each time overcurrent element before
PHASE TIME OC 1 FUNCTION
to "Trip + AR". In Setpoint Group 3, set
to "Trip + AR". Select the same pickup level for each
setpoint to "Group 2". Similarly, set it to "Group 3" for
8.6 CONTROL SCHEMES
to the
setpoint and the phase current
value
AR SHOT NUMBER IN EFFECT
setpoint and the phase
AR SHOT NUMBER IN
selected as "Trip + AR", set the
has expired, the relay will
selected as "Trip + AR", set the
to "Trip + AR".
PHASE INST OC 1 FUNCTION
MAX
8
8-55
Advertisement
Table of Contents
