7XV5662-0AA00
English
C53000-B1174-C134-7
33
Application
The communication converter (KU–XG) is a peripheral device connected to the protection
device, which allows serial data exchange between two protection devices. A communicati-
on network is used for this purpose. The digital synchronous interfaces X.21 and G.703–
64 kBit/s (G.703.1) are used as ports.
On the opposite side a second communication converter converts the data back into data
legible for the second protection device (Figure 12). This conversion allows two protection
devices to exchange data with each other. With two communication converters and one
communication connection, it is therefore possible to send data from one protection device
to a second device and to receive data from there.
The connection to the protection device is made noise-proof via a fibre-optic link, the FO5
module. FO5 means that this is an optical 820–nm plug-in module in the protection device,
which carries out a clock recovery from the transmitting clock of the communcation network.
For more details, see SIPROTEC
®
device manual.
The data transfer between the protection devices represents a point-to-point connection, it
is bit-transparent and synchronous.
The communication converter supports simple commissioning of the entire communication
path. It has a relay contact to output a “device ready” signal (GOK / DR) and also has an
extended range power supply unit covering the entire normal DC and AC auxiliary voltage
range. In addition, all important operating states are signalled by LEDs.
Figure 12 Typical structure of a communication line
X.21
G.703.1
KU–XG1
Protection
1
optical
electrical
electrical
FO5
FO5
FO
FO
X.21
G.703.1
X.21
G.703.1
X.21
G.703.1
KU–XG2
Protection
2
Permanent line
DCE
DTE
DTE
DCE
➀
➁
➁
➀
Communication
device
Communication
converter
optical
Copper cable
➁
Short distance
➂
➂
Fibre-optic cable
➂
max. 1.5 km (1mile)
device
device
Communication network
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