Protection Functions
162 PRS-7367
t Operate time in seconds
A Curve Parameter A
B The Curve Parameter B
p Curve Parameter p
G The measured value
Gs The Start value
k The Time Multiplier
If the Curve_Type=0, the operate time is Definite Time mode and the time duration can be
calculated according to the formula:
If all available curves do not comply with user application, user can customize the inverse-time
curve characteristic when the setting Curve_Type is set to 5. The characteristic curve is
determined by the following:
s
()
( / )
p
A
t B k
G G C
Where:
t The operate time (in seconds)
A The Curve Parameter A
B The Curve Parameter B
C The Curve Parameter C
p The Curve Parameter P
G The value of the characterizing quantity
Gs The Start setting value of the characterizing quantity
k The Constant characterizing the relay
If the coefficients A is set to 0, the operate time is Definite Time mode and the time duration can be
calculated according to the formula:
The operation is activated after the operation timer has reached the calculated time value. If a
drop-off situation happens, that is, a fault suddenly disappears before the operate delay is
exceeded, the operation will reset after the reset time is exceeded.
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