Setting Notes - Siemens SIPROTEC 7SA522 Manual

2 Functions
Functional Logout
Disturbance and
Transmission
Failure
2.4.2

Setting Notes

General
Protection Data
Interface 1
118
In an overall topology up to 3 devices that use teleprotection, it is possible to take out
one device, e.g. for maintenance purposes, from the protection function "Teleprotec-
tion" without having to re-parameterize the device. A logged out device (in the Func-
tional Logout) no longer participates in the teleprotection, but still sends and receives
remote indications and commands (see Section 2.4.2 under "Communication Topol-
ogy").
The communication is continuously monitored by the devices. Single faulty data tele-
grams are not a direct risk if they occur only occasionally. They are recognized and
counted in the device which detects the disturbance and can be read out as statistical
information.
If several faulty telegrams or no data telegrams at all are received, this is regarded as
a Disturbance as soon as a time delay for data disturbance alarm (default setting 100
ms, can be altered) is exceeded. A corresponding alarm is output. When the system
offers no alternative way of communication (as for the ring topology), the teleprotec-
tion scheme is disabled. As soon as the data transmission operates properly again,
the devices will automatically switch back to the teleprotection scheme.
Transmission time jumps that, for example, can occur in case of switchings in the com-
munication network can be recognized and corrected by the device. After at most 2
seconds the transmission times are measured again.
If the communication is interrupted for a permanent period (which is longer than a set-
table time period), this can be regarded as a transmission Failure of the communica-
tion. A corresponding alarm is output. Otherwise the same reactions apply as for the
data disturbance.
Protection data interfaces connect the devices with the communication media. The
communication is permanently monitored by the devices. Address  7'$7$
',6785% defines after which delay time the user is informed about a faulty or missing
telegram. Address  7'$7$)$,/ is used to set the time after which a transmis-
sion failure alarm is output.
The protection data interface 3 ,17(5)$&(  can be turned 21 or 2)) at address
 67$7( 3527 , . If it is switched 2)), this corresponds to a transmission fail-
ure. In case of a ring topology the transmission of data can continue their operation,
but not in case of a chain topology.
In address  &211(&  29(5, set the transmission media that you want to
connect to protection data interface 3 ,17(5)$&( . The following selection is pos-
sible:
)RSWLF GLUHFW, i.e. communication directly by fibre-optic cable with 512 kBit/s,
&RP FRQY  N%, i.e. via communication converters with 64 kBit/s (G703.1 or X.21),
&RP FRQY  N%, i.e. via communication converters with 128 kBit/s (X.21, copper
cable, bidirectional),
&RP FRQY  N%, i.e. via communication converters with 512 kBit/s (X.21).
The possibilities may vary for the different device versions. The data must be identical
at both ends of a communication route.
7SA522 Manual
C53000-G1176-C155-3