ABB / Thermal overload protection, two time constants (TRPTTR) _ Setting & highlights _ AB2127

Overview

The “Thermal overload protection” estimates the internal heat content of the transformer (temperature) continuously. This estimation is made by using a thermal model of the transformer with two time constants, which is based on current measurement.

For more detailed information on “Thermal overload protection, two time constants” function, refer to ABB, Relion 670 Series manuals.

To see other supported functions, click here.

Function Identification

Signals & Setting Parameters

TRPTTR function block

TRPTTR Input signals

TRPTTR Input signals
Name	Type	Default	Description
I3P	GROUP SIGNAL	–	Group signal for current input
BLOCK	BOOLEAN	0	Block of function
COOLING	BOOLEAN	0	Cooling input Off / On. Changes Ib setting and time constant
ENMULT	BOOLEAN	0	Enable Multiplier for currentReference setting
RESET	BOOLEAN	0	Reset of function

TRPTTR Output signals

TRPTTR Output signals
Name	Type	Description
TRIP	BOOLEAN	Trip Signal
START	BOOLEAN	Start signal
ALARM1	BOOLEAN	First level alarm signal
ALARM2	BOOLEAN	Second level alarm signal
LOCKOUT	BOOLEAN	Lockout signal
WARNING	BOOLEAN	Warning signal: Trip within set warning time

TRPTTR Group settings (basic)

TRPTTR Group settings (basic)
Name	Values (Range)	Unit	Step	Default	Description
Operation	Off On	–	–	Off	Operation Off / On
IRef	10.0 – 1000.0	%	1.0	100.0	Reference current in %
IRefMult	0.01 – 10.00	–	0.01	1.00	Multiplication Factor for reference current
IBase1	30.0 – 250.0	%IB	1.0	100.0	Base current,IBase1 without Cooling input in % of IBase
IBase2	30.0 – 250.0	%IB	1.0	100.0	Base Current,IBase2, with Cooling input ON in % of IBase
Tau1	0.10 – 500.00	Min	0.01	60.00	Time constant without cooling input in min, with IBase1
Tau2	0.10 – 500.00	Min	0.01	60.00	Time constant with cooling input in min, with IBase2
IHighTau1	30.0 – 250.0	%IB1	1.0	100.0	Current Sett, in % of IBase1 for rescaling TC1 by TC1-IHIGH
Tau1High	5 – 2000	%tC1	1	100	Multiplier in % to TC1 when current is > IHIGH-TC1
ILowTau1	30.0 – 250.0	%IB1	1.0	100.0	Current Set, in % of IBase1 for rescaling TC1 by TC1-ILOW
Tau1Low	5 – 2000	%tC1	1	100	Multiplier in % to TC1 when current is < ILOW-TC1
IHighTau2	30.0 – 250.0	%IB2	1.0	100.0	Current Set, in % of IBase2 for rescaling TC2 by TC2-IHIGH
Tau2High	5 – 2000	%tC2	1	100	Multiplier in % to TC2 when current is >IHIGH-TC2
ILowTau2	30.0 – 250.0	%IB2	1.0	100.0	Current Set, in % of IBase2 for rescaling TC2 by TC2-ILOW
Tau2Low	5 – 2000	%tC2	1	100	Multiplier in % to TC2 when current is < ILOW-TC2
ITrip	50.0 – 250.0	%IBx	1.0	110.0	Steady state operate current level in % of IBasex
Alarm1	50.0 – 99.0	%Itr	1.0	80.0	First alarm level in % of heat content trip value
Alarm2	50.0 – 99.0	%Itr	1.0	90.0	Second alarm level in % of heat content trip value
ResLo	10.0 – 95.0	%Itr	1.0	60.0	Lockout reset level in % of heat content trip value
ThetaInit	0.0 – 95.0	%	1.0	50.0	Initial Heat content, in % of heat content trip value
Warning	1.0 – 500.0	Min	0.1	30.0	Time setting, below which warning would be set (in min)
tPulse	0.01 – 0.30	s	0.01	0.10	Length of the pulse for trip signal (in sec).

TRPTTR Non group settings (basic)

TRPTTR 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

TRPTTR Monitored data

TRPTTR Monitored data
Name	Type	Values (Range)	Unit	Description
HEATCONT	REAL	–	%	Percentage of the heat content of the transformer
I-MEASUR	REAL	–	%	Current measured by the function in % of the rated current
TTRIP	INTEGER	–	–	Estimated time to trip (in min)
TRESLO	INTEGER	–	–	Estimated time to reset of the function (in min)
TTRIPCAL	INTEGER	0=Not Active� 1=Long Time 2=Active	–	Calculated time status to trip: not active/long time/active
TRESCAL	INTEGER	0=Not Active� 1=Long Time 2=Active	–	Calculated time status to reset: not active/long time/active