GE Multilin G650 Manual page 212

5 SETTINGS
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)
GEK-113285A
TDM
=
T
2
⎡ ⎤
⎛ ⎞
V
−
⎜ ⎟
⎢ Pickup ⎥
⎝ ⎠
⎣ ⎦
F
TDM
=
T
⎡ ⎤
⎛ ⎞
V
−
⎜ ⎟
⎢ Pickup ⎥
⎝ ⎠
⎣ ⎦
F
TDM
=
T
0 5 .
⎡ ⎤
⎛ ⎞
V
−
⎜ ⎟
⎢ Pickup ⎥
⎝ ⎠
⎣ ⎦
F
G650 Generator Protection & Control System
5.4 PROTECTION ELEMENTS
>
whenV / F Pickup
1
>
whenV / F Pickup
1
>
whenV / F Pickup
1
5
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