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]
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