6–54 345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
S3 PROTECTION CHAPTER 6: SETPOINTS
HEAT TIME CONSTANT (τ
H
)
Range: 3.0 to 600.0 min in steps of 0.1 min
Default: 6.0 min
This time constant is used to compute the thermal capacity when the thermal capacity
at each time-step is greater than the one computed in the previous time-step.
COOL TIME CONSTANT (τ
C
)
Range: 1.00 to 6.00 x
τ
H
in steps of 0.01 x
τ
H
Default: 2.00 x
τ
H
This time constant is used to compute the thermal capacity when the thermal capacity
at each time-step is less than the one computed in the previous time-step.
OUTPUT RELAY X
For details see Common setpoints
.
BLOCK 1/2/3
For details see Common setpoints
.
NOTE:
The thermal capacity is displayed on the relay even if the Thermal Overload Function is
set to “Disabled”.
To Next Page
Loading...
