GE T60 Instruction Manual page 478
Transformer protection system
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GROUPED ELEMENTS
CHAPTER 5: SETTINGS
T = Operating Time
TDM = Time Delay Multiplier (delay in seconds)
V = fundamental RMS value of voltage (pu)
F = frequency of voltage signal (pu)
Pickup = volts-per-hertz pickup setpoint (pu)
The figure shows the volts/hertz inverse A curves.
Figure 5-171: Volts-per-hertz curves, inverse curve A
5
Inverse curve B
The curve for the Volts/Hertz Inverse Curve B shape is derived from the formula:
Eq. 5-53
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 figure shows the volts/hertz inverse B curves.
5-296
T60 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
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