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Table 3-17 Possible Dropout Values
Signal Type Dropout Values
SP (single-point indication) Outgoing, Incoming, Hold
DP (double-point indication) On, Off, Intermediate Position, Disturbed Position,
Hold
IN (metered values) 0, Hold
MW (measured values) 0, Hold
ACT Hold
i
i
NOTE
If the protection link fails, these values can be set on the receiver side.
EXAMPLE
2 devices are connected with differential protection via a 64-kbits channel. This is a type 1 topology. 8 bits are
freely available for priority 1. Now, for example, 4 SPS and 2 DPS can be routed:
4 x 1 bit + 2 x 2 bits = 8 bits
i
i
NOTE
Measured values are transmitted as primary values.
Remote Data Transmission: Routing of the Indications and Measured Values to the Protection Interface
The transmission is organized in the form of a data bar which is continuously exchanged between the devices.
For this, see
Figure 3-57 .
A device indication or measured value is allocated to a definite data area of the bar.
Figure 3-58 to Figure 3-61 show the routing for a communication topology of protection interface type 1.
To transmit signals to other devices, these signals must be routed in the communication matrix under
Transmit. Binary inputs 1 and 2 are single-point indications (SPS) and are routed to position 1 and position 2
of the transmission with the highest priority (priority 1). For 64 kbit/s, for example, only 8 of these data areas
are available for type 1; they are exchanged between the transmission routes with each telegram. Signals 3
and 4 are double-point indications (DPS), for example, a switch position that is transmitted by a device 1. A
double-point indication occupies 2 positions on the data bar. In addition, a measured and metered value are
communicated via priority 3.
As a measured or metered value uses 32 bits, value 2 starts at position 33. DIGSI 5 indicates the next available
position.
System Functions
3.5 Protection Communication
114 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017