ABB / Thermal overload protection, one time constant, Celsius/Fahrenheit (LCPTTR/LFPTTR) _ Setting & highlights _ AB2040

Overview

The increasing utilization of the power system closer to the thermal limits has generated a need of a thermal overload protection for power lines. A thermal overload will often not be detected by other protection functions and the introduction of the thermal overload protection can allow the protected circuit to operate closer to the thermal limits.

For more detailed information on “Thermal overload protection, one time constant, Celsius/Fahrenheit (LCPTTR/LFPTTR)” 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
Thermal overload protection, one time constant, Celsius	LCPTTR		26
Thermal overload protection, one time constant, Fahrenheit	LFPTTR		26

Signals & Setting Parameters

LCPTTR function block

LCPTTR Input signals

LCPTTR Input signals
Name	Type	Default	Description
I3P	GROUP SIGNAL	–	Group signal for current input
BLOCK	BOOLEAN	0	Block of function
BLKTR	BOOLEAN	0	Block of trip
ENMULT	BOOLEAN	0	Current multiplyer used when THOL is for two or more lines
AMBTEMP	REAL	0	Ambient temperature from external temperature sensor
SENSFLT	BOOLEAN	0	Validity status of ambient temperature sensor
RESET	BOOLEAN	0	Reset of internal thermal load counter

LCPTTR Output signals

LCPTTR Output signals
Name	Type	Description
TRIP	BOOLEAN	Trip
START	BOOLEAN	Start Signal
ALARM	BOOLEAN	Alarm signal
LOCKOUT	BOOLEAN	Lockout signal

LCPTTR Group settings (basic)

LCPTTR Group settings (basic)
Name	Values (Range)	Unit	Step	Default	Description
Operation	Off On	–	–	Off	Operation Off / On
TRef	0 – 300	Deg C	1	90	End temperature rise above ambient of the line when loaded with IRef
IRef	0 – 400	%IB	1	100	The load current (in % of IBase) leading to TRef temperature
IMult	1 – 5	–	1	1	Current multiplier when function is used for two or more lines
Tau	1 – 1000	Min	1	45	Time constant of the line in minutes.
AlarmTemp	0 – 200	Deg C	1	80	Temperature level for start (alarm)
TripTemp	0 – 300	Deg C	1	90	Temperature level for trip
ReclTemp	0 – 300	Deg C	1	75	Temperature for reset of lockout after trip
tPulse	0.05 – 0.30	s	0.01	0.10	Operate pulse length. Minimum one execution cycle
AmbiSens	Off On	–	–	Off	External temperature sensor available
DefaultAmbTemp	-50 – 100	Deg C	1	20	Ambient temperature used when AmbiSens is set to Off.
DefaultTemp	-50 – 300	Deg C	1	50	Temperature raise above ambient temperature at startup

LCPTTR Non group settings (basic)

LCPTTR 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

LCPTTR Monitored data

LCPTTR Monitored data
Name	Type	Values (Range)	Unit	Description
TTRIP	INTEGER	–	–	Estimated time to trip (in min)
TENRECL	REAL	–	–	Estimated time to reset of lockout (in min)
TEMP	REAL	–	deg	Calculated temperature of the device
TEMPAMB	REAL	–	deg	Ambient temperature used in the calculations
TERMLOAD	REAL	–	–	Temperature relative to operate temperature

LFPTTR function block

LFPTTR Input signals

LFPTTR Input signals
Name	Type	Default	Description
I3P	GROUP SIGNAL	–	Group signal for current input
BLOCK	BOOLEAN	0	Block of function
BLKTR	BOOLEAN	0	Block of trip
ENMULT	BOOLEAN	0	Current multiplyer used when THOL is for two or more lines
AMBTEMP	REAL	0	Ambient temperature from external temperature sensor
SENSFLT	BOOLEAN	0	Validity status of ambient temperature sensor
RESET	BOOLEAN	0	Reset of internal thermal load counter

LFPTTR Output signals

LFPTTR Output signals
Name	Type	Description
TRIP	BOOLEAN	Trip
START	BOOLEAN	Start Signal
ALARM	BOOLEAN	Alarm signal
LOCKOUT	BOOLEAN	Lockout signal

LFPTTR Group settings (basic)

LFPTTR Group settings (basic)
Name	Values (Range)	Unit	Step	Default	Description
Operation	Off On	–	–	Off	Operation Off / On
TRef	0 – 600	Deg F	1	160	End temperature rise above ambient of the line when loaded with IRef
IRef	0 – 400	%IB	1	100	The load current (in % of IBase) leading to TRef temperature
IMult	1 – 5	–	1	1	Current multiplier when function is used for two or more lines
Tau	1 – 1000	Min	1	45	Time constant of the line in minutes.
AlarmTemp	0 – 400	Deg F	1	175	Temperature level for start (alarm)
TripTemp	0 – 600	Deg F	1	195	Temperature level for trip
ReclTemp	0 – 600	Deg F	1	170	Temperature for reset of lockout after trip
tPulse	0.05 – 0.30	s	0.01	0.10	Operate pulse length. Minimum one execution cycle
AmbiSens	Off On	–	–	Off	External temperature sensor available
DefaultAmbTemp	-50 – 250	Deg F	1	60	Ambient temperature used when AmbiSens is set to Off.
DefaultTemp	-50 – 600	Deg F	1	100	Temperature raise above ambient temperature at startup

LFPTTR Non group settings (basic)

LFPTTR 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

LFPTTR Monitored data

LFPTTR Monitored data
Name	Type	Values (Range)	Unit	Description
TTRIP	INTEGER	–	–	Estimated time to trip (in min)
TENRECL	REAL	–	–	Estimated time to reset of lockout (in min)
TEMP	REAL	–	Temperatur e Fahrenheit	Calculated temperature of the device
TEMPAMB	REAL	–	Temperatur e Fahrenheit	Ambient temperature used in the calculations
TERMLOAD	REAL	–	–	Temperature relative to operate temperature