Thermal Overload Protection Settings - NR Electric PCS-9611 Instruction Manual

3 Operation Theory
Imax_rms > [49.K_Trp]×[49.Ib_Set]
[49.Blk]
[49.En1]
[49.En_Trp]
[49.Clr]
Imax_rms > [49.K_Alm]×[49.Ib_Set]
[49.Blk]
[49.En_Alm]
[49.Clr]
Figure 3.4-2 Logic diagram of the thermal overload protection
Where:
"Imax_rms" is the maximum RMS phase current;
[49.K_Trp] is the factor setting of the thermal overload protection;
[49.Ib_Set] is the reference current setting of the thermal overload protection;
[49.K_Alm] is the factor setting of the thermal overload alarm element;
[49.En_Trp] is the logic setting of the thermal overload protection;
[49.En_Alm] is the logic setting of the thermal overload alarm element;
[49.En1] is the binary signal for enabling the thermal overload protection;
[49.Blk] is the binary signal for blocking the thermal overload protection;
[49.Clr] is the binary signal for clearing the thermal accumulation.

3.4.2 Thermal Overload Protection Settings

All the settings of the thermal overload protection are listed in the following table. For the
information about the common explanation of the settings, see Section 7.3.
No. Menu text
1 49.Ib_Set
2 49.Tau
3 49.C_Disspt
4 49.K_Trp
5 49.K_Alm
3-18
&
&
Explanation
The reference current s etting of the thermal
overload protection
The time constant setting of the thermal overload
protection
The thermal dissipation constant setting of the
thermal overload protection
The factor setting of the thermal overload
protection which is associated to the thermal state
formula
The factor setting of the thermal overload alarm
element which is associated to the thermal state
formula
Date: 2014-04-08
[49.St]
Thermal
[49.Op]
Accumulator
CLR
Thermal
[49.Alm]
Accumulator
CLR
0.05In~3.0In
10~6000s
0.2~5.0
1.0~3.0
1.0~3.0
Range Step
0.001A
0.001s
0.001
0.001
0.001
PCS-9611 Feeder Relay