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To prevent closing of a circuit breaker after a trip the function can block the closing.
The two instances of the SMPPTRC function are identical except, for the name of the function
block (SMPPTRC1 and SMPPTRC2). References will therefore only be made to SMPPTRC1 in the
following description, but they also apply to SMPPTRC2.
16.1.2.1
Three-phase tripping
M14828-7 v8
A simple application with three-phase tripping from the logic block utilizes part of the function
block. Connect the inputs from the protection function blocks to the input TRIN. If necessary
(normally the case) use a logic OR block to combine the different function outputs to this
input. Connect the output TRIP to the digital Output/s on the IO board.
This signal can also be used for other purposes internally in the IED. An example could be the
starting of Breaker failure protection. The three outputs TRL1, TRL2, TRL3 will always be
activated at every trip and can be utilized on individual trip outputs if single-phase operating
devices are available on the circuit breaker even when a three-phase tripping scheme is
selected.
Set the function block to
Program = 3Ph and set the required length of the trip pulse to for
example,
tTripMin = 150ms.
For special applications such as Lock-out refer to the separate section below. The typical
connection is shown below in figure
. Signals that are not used are dimmed.
BLOCK
BLKLKOUT
TRIN
TRINL1
TRINL2
TRINL3
PSL1
PSL2
PSL3
1PTRZ
1PTREF
P3PTR
SETLKOUT
RSTLKOUT
SMPPTRC
TRIP
TRL1
TRL2
TRL3
TR1P
TR2P
TR3P
CLLKOUT
³
1
Impedance protection zone 1 TRIP
EF4PTOC TRIP
en05000544.vsd
Impedance protection zone 3 TRIP
Impedance protection zone 2 TRIP
IEC05000544 V2 EN-US
Figure 391: Tripping logic SMPPTRC is used for a simple three-phase tripping application
16.1.2.2
Single- and/or three-phase tripping
M14828-11 v4
The single-/three-phase tripping will give single-phase tripping for single-phase faults and
three-phase tripping for multi-phase fault. The operating mode is always used together with a
single-phase autoreclosing scheme.
The single-phase tripping can include different options and the use of the different inputs in
the function block.
The inputs 1PTRZ and 1PTREF are used for single-phase tripping for distance protection and
directional earth fault protection as required.
Section 16
1MRK 505 343-UEN B
Logic
634
Application manual
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