In stressed situations in the power system, the lines and cables may be required
to be overloaded for a limited time. This should be done without any risk for the
above-mentioned risks.
The thermal overload protection provides information that makes temporary
overloading of cables and lines possible. The thermal overload protection estimates
the conductor temperature continuously. This estimation is made by using a
thermal model of the line/cable that is based on the current measurement.
If the temperature of the protected object reaches a set warning level, a signal is
given to the operator. This enables actions in the power system to be done before
dangerous temperatures are reached. If the temperature continues to increase to
the maximum allowed temperature value, the protection initiates a trip of the
protected line.
4.1.3.6
Signals
Table 287: T1PTTR Input signals
Name
Type
Default
Description
I_A
SIGNAL
0
Phase A current
I_B
SIGNAL
0
Phase B current
I_C
SIGNAL
0
Phase C current
ENA_MULT
BOOLEAN
0=False
Enable Current multi-
plier
BLK_OPR
BOOLEAN
0=False
Block signal for oper-
ate outputs
AMB_TEMP
FLOAT32
0
The ambient temper-
ature used in the cal-
culation
Table 288: T1PTTR Output signals
Name
Type
Description
OPERATE
BOOLEAN
Operate
START
BOOLEAN
Start
ALARM
BOOLEAN
Thermal Alarm
BLK_CLOSE
BOOLEAN
Thermal overload indicator.
To inhibite reclose.
4.1.3.7
Settings
Table 289: T1PTTR Group settings (Basic)
Parameter
Values (Range)
Unit
Step
Default
Description
Env temperature
Set
-50...100
°C
1
40
Ambient tempera-
ture used when
no external temper-
Table continues on the next page
Protection functions
1MRS758755 C
270
REC615 & RER615
Technical Manual
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