GE T60

GE Multilin T60 Transformer Protection System 5-267
5 SETTINGS 5.6 GROUPED ELEMENTS
5
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:
(EQ 5.46)
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
Multiples of volts per hertz pickup
Time to trip ( in seconds)
Time
delay
setting
830738A1.CDR
T
TDM
V
F
--- -


Pickup 1–
----------------------------------------------
when
V
F
--- -
Pickup=
Time to trip ( in seconds)
Multiples of volts per hertz pickup
830739A1.CDR
Time
delay
setting