External Direct And Remote Tripping; Method Of Operation - Siemens siprotec 7SA6 User Manual

6.8

External Direct and Remote Tripping

6.8.1

Method of Operation

External Trip of the
Local Circuit
Breaker
Remote Trip of the
Circuit Breaker at
the Opposite Line
End
7SA6 Manual
C53000-G1176-C133-1
Any signal from an external protection or monitoring device can be coupled into the
signal processing of the 7SA6 by means of a binary input. This signal may be delayed,
alarmed and routed to one or several output relays. In Figure 6-82 the logic diagram
is shown. If the device and circuit breaker are capable of single-phase operation, it is
also possible to trip single phase. The tripping logic of the device in this case ensures
that the conditions for single-phase tripping are satisfied (e.g. single-phase tripping
enabled, automatic reclosure ready).
The external tripping can be switched on and off with a setting parameter and may be
blocked via binary input.
4417
>DTT Trip L123
≥1
4412 >DTT Trip L1
≥1
4413 >DTT Trip L2
≥1
4414 >DTT Trip L3
!! 9UUÃ9v…rp‡ÃU…vƒ
ON
„1"
OFF
4403 >BLOCK DTT
Figure 6-82 Logic diagram of the local external tripping
For remote tripping at the opposite line end, one separate communication channel is
required for each required transmission direction. For this purpose, fibre-optic
communication channels could for example be used or communication cables with
voice frequency modulated HF channels, power line carrier or microwave radio
channels.
If the trip command of the distance protection is to be transmitted, it is best to use the
integrated teleprotection function for the transmission of the signal as this already
incorporates the optional extension of the transmitted signal, as described in Sub-
section 6.4.1.3. Any of the commands can of course be used to trigger the transmitter
to initiate the send signal.
On the receiver side, the local external trip function is used. The receive signal is
routed to a binary input which is assigned to the logical binary input function "!'77
7ULS /". If single pole tripping is required, the following binary inputs may
alternatively be used "!'77 7ULS /", "!'77 7ULS /" and "!'77 7ULS /".
Figure 6-82 therefore also applies in this case.
!!! U…vƒÃUv€rÃ9@G6`Ã
T 0
&
T 0
&
T 0
&
≥1
4432 DTT TRIP 1p. L1
4433 DTT TRIP 1p. L2
Tripping logic
4434 DTT TRIP 1p. L3
4435 DTT TRIP L123
4421 DTT OFF
&
4422 DTT BLOCK
Functions
6-139