Pulsing Of Cb Closing Command And Incrementing The Operation Counters; Transient Fault - ABB REC 561 User Manual

1MRK 580 170-XEN
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2.3.9 Pulsing of CB closing
command and
incrementing the
operation counters

2.3.10Transient fault

Auto-reclosing - Single- and/or
three-phase
Another possibility is to set the output from the internal synchro-check
function to a permanently active signal. Set Operation = Release in the
synchro-check function. Then AR01-SYNC is configured to SYNC-
CHECKOK. See Fig. 6.
At confirmation from the synchro-check, or if the reclosing is of single-
phase type, the signal passes on.
At CBReady signal of the Close-Open (CO) type, it is checked that this
signal is present to allow for reclosing.
The synchronism and energizing check is allowed to be fulfilled for a cer-
tain time, tSync. If it does not, or if the other conditions are not fulfilled,
the reclosing is interrupted and blocked.
AR01-INHIBIT
Should this input signal appear, reclosing is inhibited. There is a tInhibit
reset timer, to ensure blocking during a few seconds after the signal is
removed. The input can, for example, be activated by a shunt reactor, or
by delayed back-up protection or breaker-failure protection.
Reclaim timer
This timer defines a period from the issue of a reclosing command, after
which the reclosing function is reset. Should a new tripping occur within
this time, it is treated as a continuation of the first fault.
When the signal to a closing command is given (Pulse AR), the reclaim
timer is started.
There is an AR State Control to track the actual state in the reclosing
sequence.
• The AR01-CLOSECB, breaker closing command, is made as a pulse
of length, as set by the tPulse 0,1-1 s parameter.
• For breakers without an anti-pumping function, the closing pulse
cutting described below can be used. It is selected by means of the
CutPulse = On parameter. A new tripping pulse, (Trip Int.), then
interrupts the pulse. But the minimum length is always 50 ms.
• At the issue of a reclosing command, the associated reclosing opera-
tion counter is also incremented.
There is a counter for each type of reclosing and one for the total of
all reclosings. See Fig. 7.
After the reclosing command, the reclaim timer keeps running for the set
time. If no tripping occurs within this time, tReclaim = 10 to 300 s, the
auto-reclosing function resets after the reclaim time. The breaker remains
closed and the operating gear recharges too, and AR01-CBCLOSED = 1,
AR01-CBREADY = 1.
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