The decision is also made in the tripping function block (TR) where the setting 3Ph,
1/3Ph is selected.
10.3.2.8 FirstShot=3ph (normal setting for a single 3 phase shot)
3-phase reclosing, one to five shots according to setting NoOfShots. The output three-
phase trip PREP3P is always set (high). A trip operation is made as a three-phase trip
at all types of fault. The reclosing is as a three-phase Reclosing as in mode 1/3ph
described below. All signals, blockings, inhibits, timers, requirements etc. are the
same as for FirstShot=1/3ph .
10.3.2.9 3-phase reclosing, one to five shots according to setting NoOfShots
1-phase or 3-phase reclosing first shot, followed by 3-phase reclosing shots, if
selected. Here, the auto-reclosing function is assumed to be "On" and "Ready". The
breaker is closed and the operation gear ready (operating energy stored). Input
START is received and sealed-in. The output READY is reset (set to false). Output
ACTIVE is set.
• If TR3P is low (1-phase trip): The timer for 1-phase reclosing open time is started
and the output 1PT1 (1-phase reclosing in progress) is activated. It can be used to
suppress pole disagreement trip and earth-fault protection during the 1-phase
open interval. •
• If TR3P is high (3-phase trip): The timer for 3-phase auto-reclosing open time, t1
3Ph or t1 3PhHS is started and output 3PT1 (3-phase auto-reclosing shot 1 in
progress) is set.
While any of the auto-reclosing open time timers are running, the output INPROGR
is activated. When the "open time" timer runs out, the respective internal signal is
transmitted to the output module for further checks and to issue a closing command to
the circuit breaker.
When a CB closing command is issued the output prepare 3-phase trip is set. When
issuing a CB closing command a reclaimtimer tReclaim is started. If no tripping takes
place during that time the auto-reclosing function resets to the “Ready” state and the
signal ACTIVE resets. If the first reclosing shot fails, a 3-phase trip will be initiated
and 3-phase reclosing can follow, if selected.
10.3.2.10 FirstShot=1ph 1-phase reclosing in the first shot
The 1-phase reclosing attempt can be followed by 3-phase reclosing, if selected. If the
first trip is a 3-phase trip the auto-reclosing will be blocked. In the event of a 1-phase
trip, the operation is as in the example described above, program mode 1/3ph. If the
first reclosing shot fails, a 3-phase trip will be initiated and 3-phase reclosing can
follow, if selected. A maximum of four additional shots can be done (according to the
1MRK 505 291-UEN A Section 10
Control
217
Application manual
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