Thermal Overload Protection, Two Time Constants Trpttr; Identification; Functionality - ABB RET650 Technical Manual

Section 8
Current protection
8.5
8.5.1
8.5.2
172
Function
Minimum polarizing voltage, Zero
sequence
Minimum polarizing voltage,
Negative sequence
Minimum polarizing current, Zero
sequence
Minimum polarizing current,
Negative sequence
Real part of source Z used for
current polarization
Imaginary part of source Z used
for current polarization
Operate time, non-directional
start function
Reset time, non-directional start
function
Operate time, directional start
function
Reset time, directional start
function
1)
Note: Timing accuracy only valid when 2nd harmonic blocking is turned off.
Thermal overload protection, two time constants
TRPTTR

Identification

Function description
Thermal overload protection, two time
constants

Functionality

If a power transformer or generator reaches very high temperatures the equipment
might be damaged. The insulation within the transformer/generator will have forced
ageing. As a consequence of this the risk of internal phase-to-phase or phase-to-earth
faults will increase. High temperature will degrade the quality of the transformer/
generator insulation.
Range or value
UBase
(1–100)% of
UBase
(1–100)% of
IBase
(2–100)% of
IBase
(2–100)% of
(0.50-1000.00) W/phase
(0.50–3000.00) W/phase
30 ms typically at 0.5 to 2 x I
set
30 ms typically at 2 to 0.5 x I
set
30 ms typically at 0,5 to 2 x I
N
30 ms typically at 2 to 0,5 x I
N
IEC 61850 IEC 60617
identification identification
TRPTTR
SYMBOL-A V1 EN
1MRK 504 135-UEN A
Accuracy
± 0.5% of U
r
± 0.5% of U
r
±1.0% of I
r
±1.0% of I
r
-
-
-
-
-
-
ANSI/IEEE C37.2
device number
49
Technical manual