Date Code 20000421 Maintenance and Testing 7-25
SEL-251, -2, -3 Instruction Manual
Current is reapplied to the relay and taken away before the reset interval
timer expires. The shot counter is then incremented to shot = 2 and the
A4 output contact deasserts (A4 = 79SH). The front panel RS (reset)
LED remains illuminated and the A1 output contact remains asserted
(A1 = 79RS).
If you complete Reclosing Relay Open Interval Timer Test steps 6 through 8
you apply current to the relay and remove it before the reset interval expires.
The shot counter is then incremented to the next shot.
5. If you repeat these steps, the reclosing relay shot counter will increment until
shot = 3. Because of the M79SH setting (M79SH = 01010), the A4 output
contact asserts again for shot = 3 (A4 = 79SH). The front panel RS (reset) LED
remains illuminated and the A1 output contact remains asserted (A1 = 79RS).
The shot counter remains at shot = 3 if you reapply current to the relay and
remove it before the reset interval expires, because shot = 3 is the last shot. The
A4 output contact remains asserted (A4 = 79SH). The front panel RS (reset)
LED remains illuminated and the A1 output contact remains asserted
(A1 = 79RS).
During this entire sequence coordination test, the reclosing relay remained in the
reset state. The front panel RS (reset) LED remained illuminated and the A1
output contact was asserted (A1 = 79RS), even though the shot counter was
being incremented and the reset interval timer reinitialized. The reset interval
timer was only used to bring the shot counter back to shot = 0 after a time equal
to the reset interval.
Close Failure Timer Test
Purpose: Verify the operating time of the close failure timer.
Method: 1. Using the SET n command (n is the active setting group), enter the following
example setting:
.
.
.
A4(2346) = CF close failure condition
.
.
.
2. Using the SET G command (G signifies the global setting group: settings
common to all groups), enter these settings:
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