GE Multilin G650 - Page 212

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)
PickupFwhenV
Pickup
F
V
TDM
T >
−
⎥
⎦
⎤
⎢
⎣
⎡
⎟
⎠
⎞
⎜
⎝
⎛
= /
1
2
PickupFwhenV
Pickup
F
V
TDM
T >
−
⎥
⎦
⎤
⎢
⎣
⎡
⎟
⎠
⎞
⎜
⎝
⎛
= /
1
PickupFwhenV
Pickup
F
V
TDM
T >
−
⎥
⎦
⎤
⎢
⎣
⎡
⎟
⎠
⎞
⎜
⎝
⎛
= /
1
5.0