ABB Relion 605 Series - Page 35

1MDU07212-YN Rev. D Section 4
Protection and Control Function
REF601 / REJ601 / REM601 29
Application Manual
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
.
Figure 7: Behavior of thermal image during power down condition
4.8.2.1 Setting range for thermal overload protection
Table 15: Setting range for thermal overload protection 3Ith, 49
Parameter
Description
Range
Unit
Step
Default
Mode ϑ
Mode of thermal overload
protection*
0 = rotating
1 = static
-
1
0
ϑ
0
Initial thermal level of the
apparatus
0…100
%
1
80
I
b
Reference current leading to
thermal calculation
0.1 … 1.5
xIn
0.1
1.0
τ
↑
Heating time constant of
machine
1 … 300
min
1
45
τ
↓s
Cooling time constant of static
machine
1 … 300
min
1
45
τ
↓r
Cooling time constant of
rotating machine*
1 … 1000
min
1
180
ϑ
alm
Alarm value
50 … 200
%
1
121
ϑ
trip
Operate value
50 … 200
%
1
144
ϑ
startinhibit
Start inhibit value
50 … 200
%
1
105