[dwstruct-030211-01.tif, 1, en_US]
Figure 3-38
Structure of the Protection Interface in a Device
The protection communication runs physically via a serial optical communication module. This module can
have 1 or 2 channels. The protection communication can take place via various modules. This depends on the
type of interface and the application. DIGSI 5 is used to configure 1 or 2 channels of a serial optical module as
a protection interface. This enables communication with the values set at the protection interface via this
channel.
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
.
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.
3.5.2.3
System Functions
3.5 Protection Communication
98
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
Summary of Contents for 6MD85
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