Siemens 6MD85, Manual

Page: 113 / 1256

dropout time, or the last value received can be retained (
Hold
setting). This can be configured separately for
each received signal (see Table 3-17 ).
i
i
NOTE
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 3-16 .
Table 3-14 and Table 3-15 show the number of data areas in the data bar in relation to the available baud
rate.
i
i
NOTE
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 3-14 Available Bits - Minimum Constellation Baud Rate 64/128 kbit/s
Priority 1 Priority 2 Priority 3
Type 1 8 bits 24 bits 128 bits
Type 2 32 bits 64 bits 256 bits
Table 3-15 Available Bits - Minimum Constellation Baud Rate 512/2048 kbit/s
Priority 1 Priority 2 Priority 3
Type 1 48 bits 128 bits 384 bits
Type 2 96 bits 200 bits 1024 bits
Table 3-16 Requirement in Bits
Signal Type Size in Bits
SP (single-point indication) 1 bit
DP (double-point indication) 2 bits
IN (metered values) 32 bits
MW (measured values) 8
32 bits
ACT 4 bits
8 The complex phasors of a measuring point are pre-routed
System Functions
3.5 Protection Communication
SIPROTEC 5, High-Voltage Bay Controller, Manual 113
C53000-G5040-C015-9, Edition 11.2017