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User Manual
Chapter 4
GFK-2849A
Oct 2019
System Operation
78
4.1
IEC 61850 System Overview
4.1.1
IEC 61850 Communications
IEC 61850 is primarily focused on electrical utility stations and substations. Substations can
be categorized as distribution or transmission substations. Although IEC 61850 applications
are primarily in electrical substations, there are applications in other industries as well (co-
gen sites). The PACSystems RX3i supports IEC 61850 Clients by providing connectivity to
substation devices like IEDs, relays, and other components.
The ECM850 uses IEC 61850 communications protocols for data exchange. The same
network can also be used for basic Ethernet communications, but use of a separate Ethernet
LAN and RX3i Ethernet interface is recommended for most applications.
An IEC 61850 network can include three types of devices:
IEC 61850 Client
In an RX3i system, the ECM850 operates as an IEC 61850
Client. It establishes an association with one or more IEDs
(IEC 61850 Server devices).
IEC 61850 Server
IEC 61850 Server devices are typically IEDs or Relays which
are distributed throughout a substation. They are connected
over an IEC 61850 network to IEC 61850 Client(s).
IEC 61850 Configurator An IEC 61850 device which may be required to connect to
IEDs for browsing the Data model in the devices.
4.1.2
RX3i IEC 61850 Client System
The ECM850 implements IEC 61850 Client as specified in the PICS and MICS. The ECM805
establishes application association with IEC 61850 Server devices for data exchange. The
ECM850 communicates with the IEDs and exchanges IED variable data with the RX3i CPU.
This data is available as symbolic variables and RX3i controller application program can use
this data for monitoring and control. This data can also be put to higher level systems like
HMI and SCADA.