ABB / Three phase undercurrent (LCP3PTUC) for DTT _ Setting & highlights _ AB2118

Overview

The “Three phase undercurrent” function is designed for detecting loss of load conditions. It is a single definite time stage trip function with Phase wise start and trip signals.

For more detailed information on “Three phase undercurrent” function, refer to ABB, Relion 670 Series manuals.

To see other supported functions, click here.

Function Identification

Function description	IEC 61850 identification	IEC 60617 identification	ANSI/IEEE C37.2 device number
Three phase undercurrent	LCP3PTUC	–	37

Signals & Setting Parameters

LCP3PTUC Function block

LCP3PTUC Input signals

LCP3PTUC Input signals
Name	Type	Default	Description
I3P	GROUP SIGNAL	–	Three phase group signal for current inputs
BLOCK	BOOLEAN	0	Block all binary outputs by resetting timers
BLKTR	BOOLEAN	0	Block trip of the function

LCP3PTUC Output signals

LCP3PTUC Output signals
Name	Type	Description
TRIP	BOOLEAN	Common trip signal
TRL1	BOOLEAN	Trip signal from phase L1
TRL2	BOOLEAN	Trip signal from phase L2
TRL3	BOOLEAN	Trip signal from phase L3
START	BOOLEAN	Common start signal
STL1	BOOLEAN	Start signal from phase L1
STL2	BOOLEAN	Start signal from phase L2
STL3	BOOLEAN	Start signal from phase L3

LCP3PTUC Group settings (basic)

LCP3PTUC Group settings (basic)
Name	Values (Range)	Unit	Step	Default	Description
Operation	Off On	–	–	Off	Operation On / Off
IUC<	1.00 – 100.00	%IB	0.01	50.00	Start value for 3 phase under current in % of IBase
tUC	0.000 – 60.000	s	0.001	0.000	Time delay to operate

LCP3PTUC Non group settings (basic)

LCP3PTUC Non group settings (basic)
Name	Values (Range)	Unit	Step	Default	Description
GlobalBaseSel	1 – 12	–	1	1	Selection of one of the Global Base Value groups

LCP3PTUC Monitored data

LCP3PTUC Monitored data
Name	Type	Values (Range)	Unit	Description
IL1	REAL	–	A	Current RMS value for phase L1
IL2	REAL	–	A	Current RMS value for phase L2
IL3	REAL	–	A	Current RMS value for phase L3