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S4 Elements
GE Multilin
•
MINIMUM OPERATING VOLTAGE: Enter the minimum value of voltage (in
terms of nominal VT secondary voltage) required to allow the Volts-per-Hertz 1
element to operate.
•
VOLTS-PER-HERTZ 1 PICKUP: Enter the volts-per-hertz value (in V/Hz)
above which the Volts-per-Hertz 1 element will pickup and start the delay timer.
•
VOLTS-PER-HERTZ 1 SHAPE: Select the curve shape to be used for the Volts-
per-Hertz 1 element. The inverse volts-per-hertz curve shapes are shown
below.
•
VOLTS-PER-HERTZ 1 DELAY: Enter the time that the volts-per-hertz value
must remain above the pickup level before the element operates.
•
VOLTS-PER-HERTZ 1 RESET: Enter the time that the volts-per-hertz value
must remain below the pickup level before the element resets.
The curve for the Inverse Curve 1 shape is derived from the formula:
T
------------------------------------- -
=
V F ⁄
------------------ -
Pickup
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)
1000
100
10
1
0.1
0.01
1.00
FIGURE 5–33: Volts Per Hertz Curve 1
The curve for the inverse curve 2 shape is derived from the formula:
T
---------------------------- -
=
V F ⁄
------------------ - 1
Pickup
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)
http://www.GEindustrial.com/multilin
Transformer Management Relay
V
D
when
>
Pickup
--- -
F
2
1
–
1.20
1.40
1.60
1.80
Multiples of Volts/Hertz Pickup
V
D
when
>
Pickup
--- -
F
–
745
(EQ 5.12)
Time
Delay
Setting
ò
10
3
1
0.3
0.1
2.00
(EQ 5.13)
5–73
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