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Protection Communication
Overview
Protection communication includes all functionalities required to exchange data via the protection interface
(PI). It manages one or a maximum of 2 protection interfaces. The Protection communication is generated
with the configuration of the channels as a protocol.
You can find detailed information in the section Protection interface in chapter
3.5.2.1 Overview of Func-
tions .
Protection Interface and Protection Topology
Overview of Functions
The Protection topology and protection interface function enables data exchange between the devices via
synchronous serial point-to-point connections from 64 kBit/s to 2 MBit/s. These connections can be established
directly via optical fibers or via other communication media, for example via dedicated lines or via communi-
cation networks.
A protection topology consists of 2 to 6 devices which communicate via protection interfaces. It can be set up
either as a redundant ring or as a chain structure. Within a topology, the protection interfaces can have a
different bandwidth. Depending on the bandwidth, a certain amount of binary information and measured
values can be transmitted bi-directionally between the devices. The connection with the lowest bandwidth
defines this amount (of binary information and measured values).
The following information that is significant for the function of the protection interface is also transferred. You
cannot change this information:
•
Topology data and values are exchanged for monitoring and testing the connection.
The results are displayed on the device or with DIGSI 5.
•
Protection data, for example differential protection data or teleprotection scheme binary data, are trans-
ferred for distance protection and ground-fault protection.
•
The devices can be synchronized in time via the connection, whereby a device of the protection topology
assumes the role of the timing master.
The connection is continuously monitored for data faults and outage, and the time delay of the data is meas-
ured.
The protection interfaces are typically used for differential protection and the teleprotection scheme. In
SIPROTEC 5 you can configure protection interfaces into all devices and then use them for further applications.
At the same time, any binary information and measured values can be transferred between the devices. The
measured values are transferred at a high transmission rate (typically: 200 values per second) as phasors with
a time stamp.
Access to devices at the remote ends is possible via the protection interface with DIGSI 5. For this, the protec-
tion-data connection is interrupted and the communication channel reserved exclusively for DIGSI 5. After
remote access with DIGSI 5, the protection connection is restored.
Structure of the Function
The protection interfaces of a device are located in the Protection communication function group. A device
has 1 or 2 specifically parameterizable protection interfaces.
The protection topology is used for administration of that topology data relevant to the respective interfaces
and containing data from other devices in the protection topology.
3.5
3.5.1
3.5.2
3.5.2.1
3.5.2.2
System Functions
3.5 Protection Communication
SIPROTEC 5, High-Voltage Bay Controller, Manual 97
C53000-G5040-C015-9, Edition 11.2017