5-76
745 Transformer Management Relay
GE Multilin
5.6 S4 ELEMENTS
5 SETPOINTS
5
The curve for the Inverse Curve 1 shape is derived
from the formula:
(EQ 5.12)
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)
The curve for the inverse curve 2 shape is derived
from the formula:
(EQ 5.13)
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)
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)
T
D
V F
⁄
Pickup
------------------
2
1
–
-----------------------------------
=
when
V
F
----
Pickup
>
0.01
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
ò
10
3
1
0.3
0.1
T
ime
to
T
rip
(seconds)
T
D
V F
⁄
Pickup
------------------
1
–
---------------------------
=
when
V
F
----
Pickup
>
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
T
ime
to
T
rip
(seconds)
T
D
V F
⁄
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
T
ime
to
T
rip
(seconds)
Содержание TRANSFORMER MANAGEMENT RELAY 745
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