ABB RELION 620 Series Technical Manual page 898

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Protection relay's physical connections

Ethernet rear connections

The Ethernet communication module is provided with either galvanic RJ-45 connection

or optical multimode LC type connection depending on the product variant and selected

communication interface option. A shielded twisted-pair cable CAT 5e is used with

RJ-45, and an optical cable (≤ 2 km) with LC type connections.

In addition, communication modules with multiple Ethernet connectors enable the

forwarding of Ethernet traffic. The variants include an internal switch that handles the

Ethernet traffic between a protection relay and a station bus. In this case, the used network

can be a ring or daisy-chain type of network topology. In loop type topology, a self-healing

Ethernet loop is closed by a managed switch supporting rapid spanning tree protocol. In

daisy-chain type of topology, the network is bus type and it is either without switches,

where the station bus starts from the station client, or with a switch to connect some

devices and the 620 series of protection relays chain to the same network.

Communication modules including Ethernet connectors X1, X2, and X3 can utilize the

third port for connecting any other device (for example, an SNTP server, that is visible for

the whole local subnet) to a station bus.

The protection relay's default IP address through this port is 192.168.2.10 with the TCP/IP

protocol. The data transfer rate is 100 Mbps.

EIA-232 serial rear connection

The EIA-232 connection follows the TIA/EIA-232 standard and is intended to be used

with a point-to-point connection. The connection supports hardware flow control (RTS,

CTS, DTR, DSR), full-duplex and half-duplex communication.

EIA-485 serial rear connection

The EIA-485 communication module follows the TIA/EIA-485 standard and is intended

to be used in a daisy-chain bus wiring scheme with 2-wire half-duplex or 4-wire full-

duplex, multi-point communication.

The maximum number of devices (nodes) connected to the bus where the

protection relay is used is 32, and the maximum length of the bus is 1312

yards (1200 meters).

1MAC504801-IB E

620 series ANSI

Technical Manual

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