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Protection
79-1
Function
51P-1
0, 1, T, L
51P-2
0, 1, T, L
51P-3
0, 1, T, L
Note:
Final trip does not have the option "1" as no more AR cycle will be initiated.
79-1, 79-2 & 79-3 Refer to functions responsible for the first, second and third
•
reclose shot of the device.
If Number of reclose attempts is set as 2, in which case 79-3 column is not valid
•
and function will consider 79-1, 79-2 and Final trip
Here:
0
– That particular protection function is blocked (no events, DR etc. will be
•
captured from this protection function, behaves as if function set to "Off").
•
1
- That particular protection function is active and trip from that function will
initiate AR cycle.
•
L
– That particular protection function is active and trip from that function will
initiate AR cycle, but after the trip no further AR cycle will be started (even though AR
cycles are remaining), and CB can be closed only after resetting the function via Web-
HMI. Power up resets lockout (trip status) automatically
T
- That particular protection function is active and trip from that function will
•
initiate AR cycle, but after the trip no further AR cycle will be started (even though AR
cycles are remaining), and but no restriction imposed on CB closing (i.e. resetting of
function is not required). Power up resets lockout (trip status) automatically
It should be noted that while setting AR initiation matrix care should be
taken that values are set properly or it may result into mal operation of
function.
The following Sequence diagram shows the various times and their effect on the AR cycle
during a successful Reclose after 3
Table 8 AR initiation matrix
79-2
0, 1, T, L
0, 1, T, L
0, 1, T, L
rd
shot and an un successful reclose after the third shot.
79-3
Final Trip
0, 1, T, L
0, T, L
0, 1, T, L
0, T, L
0, 1, T, L
0, T, L
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