L/R Control Access; Station Authority Level "L,R - ABB RELION REX640 Technical Manual

Protection and control

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Table of Contents

Basic functions

The actual state is reflected on the CONTROL function outputs. Only one output is

active at a time.

Table 70: Truth table for CONTROL

L/R control access

Four different Local/Remote control access scenarios are possible depending on the

selected station authority level: "L,R", "L,R,L+R", "L,S,R" and "L, S, S+R, L+S, L+S+R". If

control commands need to be allowed from multiple levels, multilevel access can be

used. Multilevel access is possible only by using the station authority levels "L,R,L+R"

and "L, S, S+R, L+S, L+S+R". Multilevel access status is available from IEC 61850 data

object CTRL.LLN0.MltLev.

Control access selection is made with R/L button or CONTROL function block

and IEC 61850 data object CTRL.LLN0.LocSta. When writing CTRL.LLN0.LocSta IEC

61850 data object, IEC 61850 command originator category station must be used by

the client, and remote IEC 61850 control access must be allowed by the relay station

authority. CTRL.LLN0.LocSta data object value is retained in the nonvolatile memory.

The present control status can be monitored in the HMI or PCM600 via Monitoring >

Control command with the

CTRL.LLN0. LocKeyHMI.

IEC 61850 command originator category is always set by the IEC 61850 client.

The relay supports station and remote IEC 61850 command originator categories,

depending on the selected station authority level.

Relay default station authority level is "L,R". In this scenario only local or remote

control access is allowed. Control access with IEC61850 command originator

category station is interpreted as remote access. There is no multilevel access

LR state parameter or from the IEC 61850 data object

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Technical Manual