SCADA Communication

[timm333]

Just trying to figure out the typical connection between power system protective-relays and SCADA using fiber optic cables. One end of fiber optic cable can be connected to the output of the protective-relay; can the other end be connected directly to SCADA? Or should other components [media converter, SDH (synchronous digital hierarchy), OFMR (optical fiber management rack), DVM (data and voice multiplexer), etc.] be inserted in between protective-relay and SCADA? Thanks for help.

 

[Bugman1400]

Just trying to figure out the typical connection between power system protective-relays and SCADA using fiber optic cables. One end of fiber optic cable can be connected to the output of the protective-relay; can the other end be connected directly to SCADA? Or should other components [media converter, SDH (synchronous digital hierarchy), OFMR (optical fiber management rack), DVM (data and voice multiplexer), etc.] be inserted in between protective-relay and SCADA? Thanks for help.

Obviously, it depends on the SCADA interface. I'm assuming a local interface. Some of them do provide an FO connection (usually ST). If your SCADA interface only provides a serial connection then you'll need a converter.

 

[timm333]

Actually I'm told that one fiber optic cable would go directly to SCADA for testing purpose, and the other would go to SCADA through media converters, SDH, etc. I don't have much experience with communication systems, so I thought I should it discuss with you guys.

 

[tom baker]

Actually I'm told that one fiber optic cable would go directly to SCADA for testing purpose, and the other would go to SCADA through media converters, SDH, etc. I don't have much experience with communication systems, so I thought I should it discuss with you guys.

The signals TX/RX on fiber optic come from what ever your scada uses, RS232, Modbus, Ethernet, via a convertor box that changes the signals into or reads, light pulses.
Most common system is ethernet/IP.
And there are different types of fiber optic cables, multimode for short (up to 2KM) and single mode, perhaps 80 Km.

 

[timm333]

What is the difference between 820 nm, 850 nm, 1300 nm, 1310 nm, IEEE-C37 820 nm, IEEE-C37 1300 nm, serial communication, G.703, and IEC 61850?

I know 820 nm is for cabes of upto 1.5 km lengths, but other tahn that it is not clear. Thanks