9424200996 82-29
BE1-11m Time Curve Characteristics
Under/Overvoltage (27/59)
The 27 and 59 elements have independent user defined definite and inverse time delays. The inverse
time curves are defined below.
Undervoltage (27) Inverse Time Curve
The undervoltage inverse time curve is defined by Equation 82-8. The undervoltage inverse time curve
with default constants is shown in Figure 82-24.
=
+
Equation 82-8
=
|
1|
Equation 82-9
T
T
= Time to trip when M ≤ 1
T
R
= Time to reset if BE1-11m is set for integrating reset when M > 1. Otherwise, reset is
50 milliseconds or less
D = Time Dial setting (0.0 to 9.9)
M = Multiple of Pickup setting
A, B, C, N = Constants for the particular curve
R = Constant defining the reset time.
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