GE G30, Instruction Manual, Page: 343 / 698

GE Multilin G30 Generator Protection System 5-203
5 SETTINGS 5.6 GROUPED ELEMENTS
5
The volts/hertz inverse A curves are shown below.
Figure 5–88: VOLTS-PER-HERTZ CURVES, INVERSE CURVE A
INVERSE CURVE B:
The curve for the Volts/Hertz Inverse Curve B shape is derived from the formula:
(EQ 5.50)
where: T = Operating Time
TDM = Time Delay Multiplier (delay in sec.)
V = fundamental RMS value of voltage (pu)
F = frequency of voltage signal (pu)
Pickup = volts-per-hertz pickup setpoint (pu)
The volts/hertz inverse B curves are shown below.
Figure 5–89: VOLTS-PER-HERTZ CURVES, INVERSE CURVE B
Multiples of volts per hertz pickup
T
ime
to
trip
(i
n
seconds)
Time
delay
setting
830738A1.CDR
T
TDM
V
F
----
 
 
Pickup
⁄
1
–
----------------------------------------------
when
V
F
----
Pickup >
=
T
ime
to
trip
(i
n
seconds)
Multiples of volts per hertz pickup
830739A1.CDR
Time
delay
setting