GE Power Management
745 Transformer Management Relay
5-97
5 SETPOINTS
5.10 INVERSE VOLTS-PER-HERTZ CURVES
5
5.10 INVERSE VOLTS-PER-HERTZ CURVES
5.10.1 INVERSE CURVE 1
The curve for the inverse curve 1 shape is derived from the formula:
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 5–16: INVERSE CURVE 1
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
Ti
me
to
Trip
(seconds)
Summary of Contents for 745 TRANSFORMER MANAGEMENT RELAY
Page 30: ...2 8 745 Transformer Management Relay GE Power Management 2 3 SECURITY 2 GETTING STARTED 2 ...
Page 210: ...7 36 745 Transformer Management Relay GE Power Management 7 2 BLOCK DIAGRAMS 7 SCHEME LOGIC 7 ...
Page 322: ...9 12 745 Transformer Management Relay GE Power Management 9 3 USING 745PC 9 745 PC SOFTWARE 9 ...
Page 396: ...A 4 745 Transformer Management Relay GE Power Management A 1 FIGURES AND TABLES APPENDIXA A ...
Page 400: ...C 2 745 Transformer Management Relay GE Power Management C 1 WARRANTY INFORMATION APPENDIXC C ...
Page 406: ...vi 745 Transformer Management Relay GE Power Management ...
Page 407: ...GE Power Management 745 Transformer Management Relay NOTES ...
