Signals; Settings - ABB RELION 611 Series Technical Manual

1MRS757454 D
4.1.3.6
4.1.3.7
Table 120: T1PTTR Group settings (Basic)
Parameter Values (Range)
Env temperature Set
Current reference
Temperature rise
Time constant
Table continues on next page
611 series
Technical Manual
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.

Signals

Table 118: T1PTTR Input signals
Name
I_A
I_B
I_C
ENA_MULT
BLK_OPR
AMB_TEMP
Table 119: T1PTTR Output signals
Name
OPERATE
ALARM
BLK_CLOSE
START

Settings

Unit
-50...100 °C
0.05...4.00 xIn
0.0...200.0 °C
60...60000 s
Type Default Description
SIGNAL 0 Phase A current
SIGNAL 0 Phase B current
SIGNAL 0 Phase C current
BOOLEAN 0=False Enable Current multiplier
BOOLEAN 0=False Block signal for operate outputs
FLOAT32 0 The ambient temperature used in the calculation
Type Description
BOOLEAN Operate
BOOLEAN Thermal Alarm
BOOLEAN Thermal overload indicator. To inhibite reclose.
BOOLEAN Start
Step Default
1 40
0.01 1.00
0.1 75.0
1 2700
Section 4
Protection functions
Description
Ambient temperature used when no
external temperature measurement
available
The load current leading to Temperature
raise temperature
End temperature rise above ambient
Time constant of the line in seconds.
135