ABB Relion REQ650, Applications Manual

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NoOfShots parameter). During 3-phase trip (TR2P low and TR3P high) the auto-
reclosing will be blocked and no reclosing takes place.
10.3.2.11 FirstShot=1ph + 1*3ph 1-phase or 3-phase reclosing in the first shot
At 1-phase trip, the operation is as described above. If the first reclosing shot fails, a
3-phase trip will be issued and 3-phase reclosing will follow, if selected. At 3-phase
trip, the operation is similar to the above. But, if the first reclosing shot fails, a 3-phase
trip command will be issued and the auto-reclosing will be blocked. No more shots
take place!
1*3ph should be understood as “Just one shot at 3-phase reclosing”.
10.3.2.12 FirstShot=1ph + 1*2/3ph 1-phase, 2-phase or 3-phase reclosing in the
first shot
At 1-phase trip, the operation is as described above. If the first reclosing shot fails, a
3-phase trip will be issued and 3-phase reclosing will follow, if selected. At 3-phase
trip, the operation is similar as above. But, if the first reclosing shot fails, a 3-phase trip
will be issued and the auto-reclosing will be blocked. No more shots take place!
“1*3ph”should be understood as “Just one shot at 3-phase reclosing”.
A start of a new reclosing cycle is blocked during the set “reclaim time” after the
selected number of reclosing shots have been made.
10.3.2.13 Evolving fault
An evolving fault starts as a single-phase fault which leads to single-phase tripping
and then the fault spreads to another phase. The second fault is then cleared by three-
phase tripping.
The Auto-Reclosing function will first receive a trip and start signal (START) without
any three-phase signal (TR3P). The Auto-Reclosing function will start a single-phase
reclosing, if programmed to do so. At the evolving fault clearance there will be a new
signal START and three-phase trip information, TR3P. The single-phase reclosing
sequence will then be stopped, and instead the timer,
t1 3Ph , for three-phase reclosing
will be started from zero. The sequence will continue as a three-phase reclosing
sequence, if it is a selected alternative reclosing mode.
The second fault which can be single phase is tripped three phase because trip module
(TR) in the IED has an evolving fault timer which ensures that second fault is always
tripped three phase. For other types of relays where the relays do not include this
function the output PREP3PH is used to prepare the other sub-system for three phase
tripping. This signal will, for evolving fault situations be activated a short time after
the first trip has reset and will thus ensure that new trips will be three phase.
Section 10
1MRK 505 291-UEN A
Control
218
Application manual