5-66
F650 DIGITAL BAY CONTROLLER
GEK-106310-AF
5.4 PROTECTION ELEMENTS
CHAPTER 5: SETPOINTS
5.4.3.4 Thermal model element (49)
Thermal model is a protection element that calculates the thermal heating generated as a result of the flowing current,
and prevents this heating from causing damage to the protected equipment. In order to calculate the tripping time, the
following equation is used:
Where,
t is the heating/cooling time constant.
I’ is the ratio current/pickup
Table 5-35: Thermal model element settings
The cooling constant is given in times the heating constant.
The snapshot event setting enables or disables the snapshot event generation for the thermal model elements.
SETPOINT > PROTECTION ELEMENT > SETTING GROUP X Phase Current > Thermal Model >
Thermal Model 1> Thermal Model 2 > Thermal Model 3
setting Description
Name
Default
Value
Step
Range
Function permission
Function
DISABLED
N/A
[DISABLED – ENABLED]
Heating time constant
Heat Time Constant
6.0
0.1 min
[3.0 : 600.0]
Cooling time constant
Cool Time Constant
2.00
0.01 times Heat Time
[1.00 : 6.00]
Pickup level
Pickup Level
1.00
0.01 A
[0.05 : 160.00]
Alarm level
Alarm Level
80.0
0.1 %
[1.0 : 110.0]
Snapshot event generation
Snapshot Events
ENABLED
N/A
[DISABLED – ENABLED]
Summary of Contents for F650
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