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Figure 3-57
The data bar is divided into 3 priorities, which also have different transmission rates and data volumes.
The following basic principle applies for all messages: Only pure data contents are transmitted. The quality (for
example,
Valid ) is not automatically transmitted as well. If you want to transmit the quality as well (for
example, for further processing of GOOSE messages), the quality must be transmitted separately (for example,
by using CFC). If a signal that has a test flag is transmitted (because its function is in test mode, for example),
all signals are provided with a test flag on the receiving side. If the connection is broken, all received signals
are flagged with the quality
dropout time, or the last value received can be retained (Hold setting). This can be configured separately for
each received signal (see
NOTE
i
i
For ACT type signals, only the phase information is transmitted.
Indications that are transferred data fields of priority 1 are sent with every telegram. They are preferably used
for the transmission of rapid signals, for example, release for circuit-breaker intertripping. A strictly determin-
istic, rapid transmission is required there.
Signals of priority 2 are transmitted with at least every 2nd telegram. For bit rates >256 kbit/s, there are no
differences between priority 1 and priority 2.
Priority 3 information is transmitted at least every 100 ms. This priority is used for transmission of measured
and metered values. Complex values must be routed separately as the real and the imaginary part for trans-
mission. Measured-value thresholds that lead to an updating of a measured value are set centrally as a prop-
erty of the measured value. These measured-value thresholds apply with the corresponding reporting, for
example, also for the transfer via IEC 61850 to a substation automation technology.
Indications which are written to a data area x under a priority on the data bar must be routed to an indication
of the same type in the device reading this information. Otherwise, they are processed incorrectly on the
receiving side. The data bar is organized in terms of bits. For information on the bit requirement of each signal
type, refer to
Table
Table 3-13
and
rate.
NOTE
i
i
The Lowest appearing bit rate parameter, which has to be set in each device for the protection
interfaces of a topology, defines the number of data areas as well as the topology type.
If, for example, in a three-end constellation with a type 2 chain topology two devices are connected via direct
optical fibers and 2 devices via the 64-kbit/s weakest line, the 64-kbit/s section is the limiting factor for the
entire constellation.
Table 3-13
Type 1
Type 2
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
Data Bar Exchanged Between Devices
Invalid . If desired, the value can also be set to a secure state after a selectable
Table
3-16).
3-15.
Table 3-14
show the number of data areas in the data bar in relation to the available baud
Available Bits - Minimum Constellation Baud Rate 64/128 kbit/s
Priority 1
8 bits
32 bits
Priority 2
24 bits
64 bits
System Functions
3.5 Protection Communication
Priority 3
128 bits
256 bits
129
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