GE B30 Instruction Manual page 295

Multilin b30 bus differential system ur series
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5 SETTINGS
The reset time of the thermal overload protection element is also time delayed using following formula:
In the above equation,
τ
= thermal protection trip time constant.
rst
T
is a minimum reset time setting
min
Figure 5–78: IEC 255-8 SAMPLE OPERATE AND RESET CURVES
The thermal overload protection element estimates accumulated thermal energy E using the following equations calculated
each power cycle. When current is greater than the pickup level, I
When current is less than the dropout level, I
GE Multilin
2
kI
B
---------------------------- -
t
ln
rst
rst
2
2
I
kI
B
> k × I
n
t 
E
E
-------------- -
=
+
n
n 1
t
op In
> 0.97 × k × I
, the element starts decreasing the thermal energy:
n
B
B30 Bus Differential System
5.7 CONTROL ELEMENTS
T
min
, element starts increasing the thermal energy:
B
(EQ 5.16)
5
(EQ 5.17)
5-171

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