Siemens SIPROTEC 7SA6 Manual page 270

Functions
typical 1.5 km with
62.5/125 µm Multimode fibre
7SA6
typical 10 km with
9/125 µm Monomode fibre
7SA6
typical 1,5 km with
62.5/125 µm Multimode fibre
7SA6
FO5 with
ST-connector
at both ends
Disturbance and
Transmission Fault
6-80
If a communication converter is used, the device and the communication converter are
linked with a FO5 module via optical fibres. The converter itself is equipped with
different interfaces for the connection to the communication network. For ordering
information see Appendix A, Subsection A.1.1, Accessories.
7SA6
FO5 with
ST-connector
at both ends
7SA6
FO7 with
ST-connector
at both ends
Communication
Converter
o
e
X21 or
G703.1
Figure 6-46 Examples for communication connections
Note:
The redundancy of different communication connections (for ring topology) requires a
consequent separation of the devices connected to the communication network. Dif-
ferent lines should not be conducted via the same multiplex-card, as there are no oth-
er lines which could be used instead when the card failed.
The communication is continuously monitored by the devices.
Single faulty data telegrams are not a direct risk if they occur only occasionally. They
are recognized and counted in the device which detects the disturbance and can be
read out as statistical information.
If several faulty or no data telegrams are received, this is regarded as a data
disturbance in the communication as soon as a time delay for data disturbance alarm
(default setting 100 ms, configurable) is exceeded. An alarm is output. When the
system offers no alternative way of communication (as for the ring topology), the
teleprotection scheme is disabled. As soon as the data transmission operates properly
again, the devices will automatically switch back to the teleprotection scheme.
Operating time jumps that, for example, can occur in case of switchings in the
communication network can be recognized and corrected by the device. After at least
2 seconds the operating times are measured again.
7SA6
7SA6
Communication Network
typical 3.5 km with
62.5/125 µm Multimode fibrer
FO6 with
ST-connector
at both ends
typical 35 km with
62.5/125 µm Monomode fibre
FO7 with
FC-connector
at both ends
Communication
typical 1.5 km with
Converter
62.5/125 µm Multimode fibre
e
o
FO5 with
X21 or
ST-connector
G703.1
at both ends
C53000-G1176-C156-2
7SA6
7SA6
7SA6
7SA6 Manual