GE Multilin G650, Manual

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GEK-113285A G650 Generator Protection & Control System 5-69
5 SETTINGS 5.4 PROTECTION ELEMENTS
5
The 1 pu value for V/Hz operation is the Nominal Voltage setting divided by the Nominal Frequency setting adjusted in the
General Settings menu.
The characteristics of the inverse curves are shown below:
• DEFINITE TIME: T (sec) = TD Multiplier.
• INVERSE CURVE A:
where: T = operating time
TDM = Time Delay Multiplier (sec)
V = fundamental value of voltage (pu)
F=frequency of voltage signal (pu)
Pickup= volts-per-hertz pickup setpoint (pu)
• INVERSE CURVE B:
where: T = operating time
TDM = Time Delay Multiplier (sec)
V = fundamental value of voltage (pu)
F=frequency of voltage signal (pu)
Pickup= volts-per-hertz pickup setpoint (pu)
• INVERSE CURVE C:
where: T = operating time
TDM = Time Delay Multiplier (sec)
V = fundamental value of voltage (pu)
F=frequency of voltage signal (pu)
Pickup= volts-per-hertz pickup setpoint (pu)
Pickup F whenV
Pickup
F
V
TDM
T
>
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2
Pickup F whenV
Pickup
F
V
TDM
T
>
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1
Pickup F whenV
Pickup
F
V
TDM
T
>
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5 . 0