9424200994 Rev N 609
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 34 and shown in Figure 357.
=
1
Equation 34. Undervoltage (27) Inverse Time Curve Definition
where:
T
T
= Time to Trip
D = Time Dial
V
m
= Measured Voltage
V
pu
= Voltage Pickup Setting
BE1-11g Time Curve Characteristics
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