Volts-Per-Hertz Curves, Inverse Curve - GE T60 Instruction Manual

5 SETTINGS
The volts/hertz inverse A curves are shown below.
Figure 5–132: 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:
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 5–133: VOLTS-PER-HERTZ CURVES, INVERSE CURVE B
GE Multilin
Multiples of volts per hertz pickup
TDM
T --------------------------------------------- - when
=
V
  Pickup

--- -
1
–
 
F
Multiples of volts per hertz pickup
T60 Transformer Protection System
5.6 GROUPED ELEMENTS
Time
delay
setting
830738A1.CDR
V

--- - Pickup
F
Time
delay
setting
830739A1.CDR
5
(EQ 5.46)
5-267