The maximum number of devices (nodes) connected to the bus
where the IED is used is 32, and the maximum length of the bus is
1200 meters.
13.3.5 Line differential protection communication connection
The protection communication port using dedicated link is provided with either a
single mode or a multimode connection with an LC type connector. The LC
communication (X16/LD) is always the topmost in the communication module.
The port cannot be used with any other Ethernet communication network. The
interface speed is 100 Mbps.
Use direct link. Switches, hubs or routers are not allowed between
the IEDs.
If galvanic pilot wire is used as protection communication link, the pilot wire
modem RPW600 is required. The protection communication link always requires
two modems in a protection scheme, thus delivered in pairs of master (RPW600M)
and follower (RPW600F) units. A single-mode fibre optic cable with dual LC type
connectors is used to connect RED615 with RPW600 modem. The recommended
minimum length for this cable is 3 m.
Communication port X16/LD of RED615 is used both for direct
fibre optic link and connection with the pilot wire modem.
The RPW600 modem has a built-in 5 kVAC (RMS, 1 min) level
insulation against earth potential in the pilot wire connection.
13.3.6 Optical ST serial rear connection
Serial communication can be used optionally through an optical connection either
in loop or star topology. The connection idle state is light on or light off.
13.3.7 Communication interfaces and protocols
The communication protocols supported depend on the optional rear
communication module.
Section 13 1YHT530004D05 D
IED physical connections
850 615 series
Technical Manual
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