GE G60 Instruction Manual page 392

5.6 GROUPED ELEMENTS
INVERSE CURVE B:
The curve for the Volts/Hertz Inverse Curve B shape is derived from the formula:
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.
5
INVERSE CURVE C:
The curve for the Volts/Hertz Inverse Curve C shape is derived from the formula:
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)
5-232
--------------------------------------------- - when V TDM
T
=
V
  Pickup
--- - ⁄
–
 
F
Multiples of volts per hertz pickup
Figure 5–120: VOLTS-PER-HERTZ CURVES, INVERSE CURVE B
TDM
---------------------------------------------------- - when
T
=
0.5
V
  Pickup
--- -
⁄
 
F
G60 Generator Protection System
--- -
> Pickup
F
1
V
--- - >
Pickup
F
1
–
5 SETTINGS
(EQ 5.30)
Time
delay
setting
830739A1.CDR
(EQ 5.31)
GE Multilin