5-48 F650 Digital Bay Controller GE Multilin
5.4 PROTECTION ELEMENTS 5 SETPOINTS
5
5.4.3.4 THERMAL MODEL UNIT (49)
Unit 49 is a protection element that measures 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 thermal image value, the following
equation is used:
Where,
î is the heating/cooling time constant.
I is the ratio current/pickup
When a body is cooled, it does not always follow a time constant similar to the heating time constant; this is why the
function has independent setpoints for heating and cooling constants.
Table 5â43: 49 UNIT SETPOINTS
The cooling constant is given in times the heating constant.
The snapshot event setpoint enables or disables the snapshot event generation for the thermal model units.
SETPOINT > PROTECTION ELEMENTS > PHASE CURRENT > THERMAL MODEL >
THERMAL MODEL 1> THERMAL MODEL 2 > THERMAL MODEL 3
SETPOINT DESCRIPTION NAME DEFAULT
VALUE
STEP RANGE
Function permission Function DISABLED N/A [DISABLED â ENABLED]
Heating constant Heat Time Constant 6.0 0.1 min [3.0 : 600.0]
Cooling constant Cool Time Constant 2.00 0.01 times Heat Time Ct.) [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 â ENABLED]
1
*
2'
2'
î
î
I
I
Lnt
î
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