ABB Relion 605 Series Applications Manual page 35

1MDU07212-YN Rev. D
4.8.2.1
REF601 / REJ601 / REM601
Application Manual
Figure 7: Behavior of thermal image during power down condition
Setting range for thermal overload protection
Table 15: Setting range for thermal overload protection 3Ith, 49
Parameter Description
Mode ϑ Mode of thermal overload
protection*
ϑ Initial thermal level of the
0
apparatus
I Reference current leading to
b
thermal calculation
τ Heating time constant of
↑
machine
Cooling time constant of static
τ
↓s
machine
τ Cooling time constant of
↓r
rotating machine*
ϑ Alarm value
alm
ϑ Operate value
trip
ϑ Start inhibit value
startinhibit
Protection and Control Function
Option 1: When the power is restored after
Δt, the new value of current after power on
will be considered (which can be more or
less compared to when power was
interrupted) to calculate new value of
thermal image for Δt.
Option 2. When the power is restored after
Δt, the new value of thermal image is
calculated for Δt considering that the
current has remained constant at the value
when the power was interrupted.
Option 3: Power interruption of the IED
assumes no change of thermal image during
interruption period.
Option 4: Power interruption of the IED
resets the thermal image to the set value
defined by setting ϑ
.
0
Range
0 = rotating
1 = static
0...100
0.1 ... 1.5
1 ... 300
1 ... 300
1 ... 1000
50 ... 200
50 ... 200
50 ... 200
Section 4
Unit Step Default
- 1 0
% 1 80
xIn 0.1 1.0
min 1 45
min 1 45
min 1 180
% 1 121
% 1 144
% 1 105
29