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1MRK 505 288-UEN A
7.3
7.3.1
7.3.2
Technical manual
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
Section 7
Current protection
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
105
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