Communication Converter for X.21/RS422 and G.703.1
The communication converter CC-XG for coupling to a communication network is a peripheral device linked to the protection device via fiber-optic cables, which enables serial data exchange between two protection relays. A digital communication network is used. The electrical interfaces in the CC-XG for the access to the communication device are selectable as X.21 (64 kbit/s, 128 kbit/s, 256 kbit/s or 512 kbit/s) or G.703.1 (64 kbit/s). At the opposite side, the data are converted by second communication converter so that they can be read by the second device. The communication converters thus allow two protection devices to communicate synchronously and to exchange large data volumes over large distances. Typical applications are the serial protection interfaces of differential protection and distance protection of SIPROTEC 4 devices 7SD52/53, 7SD61, 7SA52 and 7SA6, and SIPROTEC 5 devices 7SD8, 7SA8 and 7SL8, where 7XV5662-0AA00 must be used.
Should asynchronous serial data of differential protection 7SD51 or of the binary signal transducer 7XV5653/7XV5673 be transmitted, the device 7XV5662-0AA01 must be used (asynchronous from 300 bit/s to 115.2 kbit/s dependent on the baudrate of X.21 or G.703.1 interface). Interference-free connection to the protection device is achieved by means of a multi-mode fiber-optic cable, with ST connectors at the CC-XG. The maximum optical transmission distance is 1.5 km (0.93 mile).
The CC-XG should be mounted or installed respectively near the DCE (data communication equipment) in the same cubicle frame or at least in the same room. The electrically connectable distance should be as short as possible; a few meters are favorable.
The data transfer between the protection devices is realized as a point-to-point connection that is bit-transparent. Data must be exchanged via dedicated communication channels within the same communication system.
Optical interface with ST connector for connection to the protection unit
Distance: 1.5 km (0.93 mile) with 62.5/125 μm and 50/125 μm multi-mode FO cable between CC-XG and the protection unit / serial device
Electrical interface to the communication device via SUB-D connector (X.21, 15 pins, automatic detection and setting to 64, 128, 256 or 512 kbit/s G.703.1, 9 pins, 64 kbit/s).
Synchronous and Asynchronous mode now within one device, selectable by push-button.
Synchronous data exchange for SIPROTEC 4 protection relays 7SD52/53, 7SD61, 7SA6, 7SA52 and all SIPROTEC 5 protection relays e.g. 7SD8, 7SA8 and 7SL8.
Asynchronous data exchange for 7SD51 protection relay. Binary signal transmitter, 7XV5653/7XV5673 or other devices with asynchronous interface.
– auxiliary supply voltage,
– X.21: clock signal of communication network; G703.1: Receive dates are on and correspond to the standardized
– and internal logic
Fail safe relay (1 changeover contact, SIPROTEC standard)
Loop test function selectable by push-button
Wide-range power supply unit (PSU) for 24 to 230 V DC and 115 to 250 V AC
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