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GE Multilin
T60 Transformer Protection System
5-175
5 SETTINGS
5.6 GROUPED ELEMENTS
5
Figure 5–88: PERCENT DIFFERENTIAL CALCULATIONS
The T60 percent differential element is based on a configurable dual-breakpoint / dual-slope differential restraint character-
istic. The purpose of the preset characteristic is to define the differential restraint ratio for the transformer winding currents
at different loading conditions and distinguish between external and internal faults. Differential restraint ratio variations
occur due to current unbalance between primary and secondary windings and can be caused by the following:
1.
Inherent CT inaccuracies.
2.
Onload tap changer operation: it adjusts the transformer ratio and consequently the winding currents.
3.
CT saturation.
Figure 5–89: PERCENT DIFFERENTIAL OPERATING CHARACTERISTIC
...
∑
Winding 1
current
waveform
Winding 2
current
waveform
Winding ‘n’
current
waveform
Magnitude
phase angle, and
zero sequence
compensation
(as required)
Magnitude
phase angle, and
zero sequence
compensation
(as required)
Magnitude
phase angle, and
zero sequence
compensation
(as required)
Decaying dc
offset filter
Decaying dc
offset filter
Decaying dc
offset filter
Discrete Fourier
Transform
MAX
Differential
phasor
Discrete Fourier
Transform
Discrete Fourier
Transform
Restraint
phasor
828714A1.CDR
Transition region
(cubic spline)
Breakpoint 2
Breakpoint 1
Id
(Ir)
Pickup
Slope 2
region
Ir
0
2
4
6
8
10
2
4
6
8
10
828750A1.CDR
Содержание UR T60
Страница 10: ...x T60 Transformer Protection System GE Multilin TABLE OF CONTENTS ...
Страница 14: ...xiv T60 Transformer Protection System GE Multilin 0 1 BATTERY DISPOSAL 0 BATTERY DISPOSAL 0 ...
Страница 34: ...1 20 T60 Transformer Protection System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Страница 436: ...5 298 T60 Transformer Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Страница 492: ...8 18 T60 Transformer Protection System GE Multilin 8 3 ENERVISTA SECURITY MANAGEMENT SYSTEM 8 SECURITY 8 ...
Страница 510: ...9 18 T60 Transformer Protection System GE Multilin 9 6 COMMISSIONING TEST TABLES 9 COMMISSIONING 9 ...
Страница 678: ...C 30 T60 Transformer Protection System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Страница 688: ...D 10 T60 Transformer Protection System GE Multilin D 1 IEC 60870 5 104 PROTOCOL APPENDIX D D ...
Страница 700: ...E 12 T60 Transformer Protection System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...