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GE Multilin
L30 Line Current Differential System
5-219
5 SETTINGS
5.7 CONTROL ELEMENTS
5
•
E
n
is the accumulated energy at index
n
.
•
E
n
– 1
is the accumulated energy at index
n
– 1.
The thermal overload protection element removes the
THERMAL PROT 1 OP
output operand when
E
< 0.05. In case of
emergency, the thermal memory and
THERMAL PROT 1 OP
output operand can be reset using
THERM PROT 1 RESET
setting.
All calculations are performed per phase. If the accumulated energy reaches value 1 in any phase, the thermal overload
protection element operates and only resets when energy is less than 0.05 in all three phases.
The logic for the thermal overload protection element is shown below.
Figure 5–108: THERMAL OVERLOAD PROTECTION SCHEME LOGIC
Table 5–24: TYPICAL TIME CONSTANTS
PROTECTED EQUIPMENT
TIME CONSTANT
MINIMUM RESET TIME
Capacitor bank
10 minutes
30 minutes
Overhead line
10 minutes
20 minutes
Air-core reactor
40 minutes
30 minutes
Busbar
60 minutes
20 minutes
Underground cable
20 to 60 minutes
60 minutes
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Содержание L30
Страница 10: ...x L30 Line Current Differential System GE Multilin TABLE OF CONTENTS ...
Страница 30: ...1 20 L30 Line Current Differential System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Страница 58: ...2 28 L30 Line Current Differential System GE Multilin 2 4 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2 ...
Страница 126: ...4 30 L30 Line Current Differential System GE Multilin 4 3 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4 ...
Страница 370: ...5 244 L30 Line Current Differential System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Страница 396: ...6 26 L30 Line Current Differential System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6 ...
Страница 450: ...10 10 L30 Line Current Differential System GE Multilin 10 4 INSTANTANEOUS ELEMENTS 10 APPLICATION OF SETTINGS 10 ...
Страница 464: ...A 10 L30 Line Current Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Страница 600: ...C 30 L30 Line Current Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Страница 610: ...D 10 L30 Line Current Differential System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...
Страница 622: ...E 12 L30 Line Current Differential System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...
Страница 634: ...F 12 L30 Line Current Differential System GE Multilin F 3 WARRANTY APPENDIX F F ...
Страница 644: ...x L30 Line Current Differential System GE Multilin INDEX ...