6.2
Data communication for Digital Differential Protection
Relays with FO-Interface
Two differential relays with an 820 nm FO-interface can be connected
together via a communication system. The communication devices
provide no optical input interfaces but have for example RS232-
interfaces. With 7XV5652 the optical signals can be converted to the
electrical RS232 signals direct at the multiplexer.
RS232
LWL
Converter
7XV5652
L2 402,1A Max450.1A
L3 402,1A Max450.1A
L2 402,1A Max450.1A
L3 402,1A Max450.1A
RS232
LWL
Converter
7XV5652
Digital Network
7SD511
7SD511
Bild 7: Data communication for digital Differential Protection Relays
with FO-Interface
Note:
Communication via comms-systems or modem delays the datas. The
relay can compensate a maximum delay of 30 ms.
Page 26 of 28
RS232-FO Converter
12.10.2006
