ABB ret650 - Thermal Overload Protection, Two Time Constants TRPTTR; Identification; Functionality

Function Range or value Accuracy
Minimum polarizing voltage, Zero
sequence
(1–100)% of UBase
± 0.5% of U
r
Minimum polarizing voltage,
Negative sequence
(1–100)% of UBase
± 0.5% of U
r
Minimum polarizing current, Zero
sequence
(2–100)% of IBase
±1.0% of I
r
Minimum polarizing current,
Negative sequence
(2–100)% of IBase
±1.0% of I
r
Real part of source Z used for
current polarization
(0.50-1000.00) W/phase
-
Imaginary part of source Z used
for current polarization
(0.50–3000.00) W/phase
-
Operate time, non-directional
start function
30 ms typically at 0.5 to 2 x I
set
-
Reset time, non-directional start
function
30 ms typically at 2 to 0.5 x I
set
-
Operate time, directional start
function
30 ms typically at 0,5 to 2 x I
N
-
Reset time, directional start
function
30 ms typically at 2 to 0,5 x I
N
-
1)
Note: Timing accuracy only valid when 2nd harmonic blocking is turned off.
8.5 Thermal overload protection, two time constants
TRPTTR
8.5.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Thermal overload protection, two time
constants
TRPTTR
SYMBOL-A V1 EN
49
8.5.2 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.
Section 8 1MRK 504 135-UEN A
Current protection
172
Technical manual