GE Multilin 745

S4 Elements745
Transformer Management Relay
Setpoints
http://www.GEindustrial.com/multilin
5–74
GE Multilin
FIGURE 5–34: Volts Per Hertz Curve 2
The curve for the inverse curve 3 shape is derived from the formula:
(EQ 5.14)
where T = operate time (seconds)
D = delay setpoint (seconds)
V = fundamental RMS value of voltage (V)
F = frequency of voltage signal (Hz)
Pickup = volts-per-hertz pickup setpoint (V/Hz)
FIGURE 5–35: Volts Per Hertz Curve 3
0.1
1
10
100
1000
1.00 1.20 1.40 1.60 1.80 2.00
Multiples of Volts/Hertz Pickup
Time
Delay
Setting
10
3
1
0.3
0.1
Time to Trip (seconds)
T
D
VF⁄
Pickup
-------------------


0.5
1–
------------------------------------------= when
V
F
--- -
Pickup>
0.1
1
10
100
1000
10000
1.00 1.20 1.40 1.60 1.80 2.00
Multiples of Voltz/Hertz Pickup
Time
Delay
Setting
ò
3
10
1
0.3
0.1
Time to Trip (seconds)