Functions
2.13 Transmission of Binary Commands and Messages
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
287
2.13
Transmission of Binary Commands and Messages
2.13.1
Functional Description
Provided that the devices work with protection data transmission via digital communication links at the ends,
the transmission of up to 28 items of binary information of any type from one device to the other is possible in
the 7SD5. Four of them are transmitted like protection signals with high priority, i.e. very fast, and are therefore
especially suitable for the transmission of other protection signals which are generated outside of 7SD5. The
other 24 are transmitted with low priority and are suitable for information on the events taking place in a sub-
station which may also be useful in other substations (see also the specifications in the „Technical Data“).
The information can be injected into the device via binary inputs and output at the other devices via binary out-
puts. The integrated user-defined CFC logic allows to perform on both the transmitting and the receiving side
logical operations on the signals and on other information from the protection and monitoring functions of the
device. Via CFC, internal signals can effect the transmission of information also.
The used binary inputs and the signal outputs must be allocated accordingly when configuring the input and
output functions. The four priority signals are fed into the device via the binary inputs
„>Remote CMD 1“
to
„>Remote CMD 4“
, forwarded to the devices of the other ends and can be signalled or processed at the re-
ceiving end with the output functions
„Remote CMD1 rec“
to
„Remote CMD4 rec“
.
The remaining 24 items of information reach the device via the binary inputs
„>Rem. Signal 1“
to
„>Rem.Signal24“
and are correspondingly available under
„Rem.Sig 1recv“
etc. at the receiving side.
When assigning the binary inputs and outputs using DIGSI, you can provide the information to be transmitted
with your own designation. If, for example, a line has a unit-connected power transformer at one end and you
wish to transmit trip by the Buchholz protection as
„>Remote CMD 1“
to the other end, you may use the binary
input and designate it as „Buchholz TRIP“. At the other end, you name the incoming command
„Remote CMD1
rec“
e.g. „Buchholz remote“ and assign it to tripping of the local circuit breaker. The Buchholz protection trip
command then generates the indications you specified.
Note
Also devices which have logged out of the line protection system (see Section 2.2.2.1 „Mode: Log out device“)
can send and receive remote indications and commands.
The indications of the devices, e.g.
„Rel1 Login“
of the topology exploration, can be used to determine
whether the signals of the sending devices are still available. They are transmitted if a device x is actively in-
volved in the communication topology.
Once an error in the protection data interface communication has been detected, the time
Td ResetRemote
at address
4512
is started for resetting the remote signals. This means that, if the communication is interrupted,
a present receive signal retains its last status for the time
Td ResetRemote
before it is reset.
No further settings are required for the transmission of binary information. Each device sends the injected in-
formation to all other devices at the ends of the protected object. Where selection is necessary, it will have to
be carried out by appropriate allocation and, if necessary, by a link at the receiving side.
