Function Range or value Accuracy
Inverse time characteristics, see Table 660,
Table 662 and Table 664
16 curve types See Table 660,
Table 662 and
Table 664
Second harmonic blocking
(5–100)% of fundamental ±2.0% of I
r
Minimum polarizing voltage (1–100)% of UBase ±0.5% of U
r
Minimum polarizing current (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, start non-directional at 0 to 2 x
I
set
Min. = 15 ms
Max. = 30 ms
-
Reset time, start non-directional at 2 x I
set
to
0
Min. = 15 ms
Max. = 30 ms
-
Operate time, start non-directional at 0 to 10
x I
set
Min. = 5 ms
Max. = 20 ms
-
Reset time, start non-directional at 10 x I
set
to 0
Min. = 20 ms
Max. = 35 ms
-
Critical impulse time 10 ms typically at 0 to 2 x I
set
-
Impulse margin time 15 ms typically -
8.5 Thermal overload protection, one time constant,
Celsius/Fahrenheit LCPTTR/LFPTTR
IP14512-1 v7
8.5.1 Identification
M17106-1 v7
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
8.5.2 Functionality
M12020-4 v14
The increasing utilization of the power system closer to the thermal limits has
generated a need of a thermal overload protection for power lines.
Section 8 1MRK 505 394-UEN A
Current protection
204 Line differential protection RED650 2.2 IEC
Technical manual
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