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GE Multilin
T60 Transformer Protection System
5-161
5 SETTINGS
5.6 GROUPED ELEMENTS
5
Figure 5–77: GROUND DISTANCE ZONES 2 AND HIGHER SCHEME LOGIC
GROUND DIRECTIONAL SUPERVISION:
A dual (zero-sequence and negative-sequence) memory-polarized directional supervision applied to the ground distance
protection elements has been shown to give good directional integrity. However, a reverse double-line-to-ground fault can
lead to a maloperation of the ground element in a sound phase if the zone reach setting is increased to cover high resis-
tance faults.
Ground distance zones 2 and higher use an additional ground directional supervision to enhance directional integrity. The
element’s directional characteristic angle is used as a
maximum torque angle
together with a 90° limit angle.
The supervision is biased toward operation in order to avoid compromising the sensitivity of ground distance elements at
low signal levels. Otherwise, the reverse fault condition that generates concern will have high polarizing levels so that a cor-
rect reverse fault decision can be reliably made.
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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 ...