Function Description
Topology and Type of Protection Communication
The protection interfaces (PI) establish a direct point-to-point connection between devices via different
communication media. Data can be transferred within the switchgear or between switchgears.
Devices connected to one another with protection communication form a protection topology. Refer to
Figure 3-38.
The protection communication in a device can be either type 1 or type 2. In the case of devices with differen-
tial protection function (7SD and 7SL), a protection communication of type 1 is automatically created. Type 2
is created for other devices, and is used for other data transmission. A device can contain only the same types
of protection communication. Type 1 and type 2 protection communication do not work together in pairs via a
protection function.
Types Description
Type 1
Application using differential
protection
With type 1, the differential protection function is the primary application.
This application requires the greatest portion of the bandwidth, so that with
type 1 the number of signals additionally available is lower. This becomes
noticeable with a 64-kBit/s protection connection via a G703.1 or X21 inter-
face. If a multiple-end differential-protection application is realized, all
protection communications must be of type 1.
A maximum of 6 line ends is possible.
If the Differential protection und Teleprotection scheme functions are to
operate in parallel in the device, the bit rate must not be less than 512
kBit/s!
Type 2
Application without using
differential protection
Type 2 has a significantly higher amount of information that can be trans-
ferred as the differential-protection application is not used here. The trans-
mission of protection data and other data, for example, measured values, is
predominant here. Using type 2 protection communication, a maximum of
6 devices can be connected to one another and different device types (for
example, 6MD, 7VK, 7SA, and 7SJ) can exchange data.
[dwintert-030211-02.tif, 1, en_US]
Figure 3-38 Data Exchange between 4 Devices with Protection Communications of Type 1 or Type 2 in a
Protection Topology
2-Device Topology: Simple or Redundant Transfer
In the case of a simple 2-device topology, one protection communication per device is required (see next
figure).
The most frequent application is the point-to-point exchange of data between 2 devices (the protection
communication is of type 2), as performed by protection transmission devices.
3.5.3.3
System Functions
3.5 Protection Communication
SIPROTEC 5, Overcurrent Protection, Manual 113
C53000-G5040-C017-8, Edition 07.2017
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