Protection Data Interfaces And Protection Data Topology; Functional Description; Protection Data Topology / Protection Data Communication - Siemens SIPROTEC 7SD610 Manual

Functions

2.2 Protection Data Interfaces and Protection Data Topology

2.2 Protection Data Interfaces and Protection Data Topology
Devices protecting an object protected by current transformer sets, must exchange data of the protected object.
This applies not only to the measured quantities relevant to the actual differential protection, but also to all data
which are to be available at the ends. These data include also topological data as well as the intertripping, trans-
fer trip, remote annunciation signals and measured values. The topology of the protected object, the allocation
of the devices to the ends of the protected object and the allocation of the ways of communication to the pro-
tection data interfaces form the topology of the protection system and its communication. Further details are
available in the function description of the differential protection (see Subsection 2.3).
2.2.1

Functional Description

2.2.1.1 Protection Data Topology / Protection Data Communication

Protection Data Topology
For a standard layout of lines with two ends, you require one protection data interface (PI1) for each device
(see also Figure 2-4).
Figure 2-4
Communication media
Communication can be effected via different communication connections. Which kind of media is used depends
on the distance and on the communication media available. For shorter distances, a direct connection via
optical fibres with a transmission rate of 512 kBit/s is possible. Otherwise, we recommend communication con-
verters. A transmission via modems and communication networks can also be realized. Please note, however,
that the tripping times of the differential protection devices depend on the transmission quality and that they are
prolonged in case of a reduced transmission quality and/or an increased transmission time. Figure 2-5 shows
some examples for communication connections. In case of a direct connection, the bridgeable distance
depends on the type of the optical fibre (refer to Chapter 4). Different types of communication modules can be
installed in the devices. For ordering information, refer to Appendix, under "Ordering Information and Accesso-
ries".
If a communication converter is used, the device and the communication converter are linked with an FO5
module via optical fibres. The converter itself is available in different versions allowing to connect it to commu-
nication networks (X.21, G703 64 kBit, G703 E1/T1) or connection via two-wire copper lines. Use the FO30
module to connect the device to the communications converter via IEEE C37.94. For the ordering information,
please refer to the Appendix under "Ordering Information and Accessories".
50
Differential protection for two ends with two 7SD610 devices, each of them having one protec-
tion data interface (transmitter/receiver)
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011