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Combined overcurrent status – Rockwell Automation 865 Differential Protection Relay User Manual

Page 108

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4-16 Supporting

Functions

865-UM001A-EN-P – July 2009

Combined Overcurrent Status

This function is collecting faults, fault types and registered fault
currents of all enabled overcurrent stages.

Table 4.12 – Line Fault Parameters

Parameter

Value

Unit

Description

Note

IFltLas

xI

N

Current of the latest overcurrent fault

(Set)

LINE ALARM
AlrL1
AlrL2
AlrL3



0
1

Start (=alarm) status for each phase.
0=No start since alarm ClrDly
1=Start is on

OCs

0
1

Combined overcurrent start status.
AlrL1=AlrL2=AlrL3=0
AlrL1=1 orAlrL2=1 or AlrL3=1

LxAlarm

On
Off

‘On’ Event enabling for AlrL1…3
Events are enabled
Events are disabled

Set

LxAlarmOff

On
Off

‘Off’ Event enabling for AlrL1…3
Events are enabled
Events are disabled

Set

OCAlarm


On
Off

‘On’ Event enabling for combined o/c
starts
Events are enabled
Events are disabled

Set

OCAlarmOff


On
Off

‘Off’ Event enabling for combined o/c
starts
Events are enabled
Events are disabled

Set

IncFltEvnt


On
Off

Disabling several start and trip events of
the same fault
Several events are enabled
Several events of an increasing fault is
disabled

Set

ClrDly 0

...

65535

s

Duration for active alarm status AlrL1,
Alr2, AlrL3 and Ocs

Set

LINE FAULT
FltL1
FltL2
FltL3


0
1

Fault (=trip) status for each phase.
0=No fault since fault ClrDly
1=Fault is on

Oct

0
1

Combined overcurrent trip status.
FltL1=FltL2=FltL3=0
FltL1=1 orFltL2=1 or FltL3=1

Set = An editable parameter (password needed)

Used with IEC 60870-105-103 communication protocol. The alarm screen will show
the latest if it's the biggest registered fault current, too. Not used with Spabus,
because Spabus masters usually don't like to have unpaired On/Off events.

Used with SPA-bus protocol, because most SPA-bus masters do need an off-event for

each corresponding on-event.