9252000898 Rev —
BE1-50/51B-235/-236 Characteristic Curves
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APPENDIX A
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CHARACTERISTIC CURVES
TABLE OF CONTENTS
INTRODUCTION....................................................................................................................................A-1
Timing.................................................................................................................................................A-1
Pickup.................................................................................................................................................A-1
Inverse Time Functions ......................................................................................................................A-2
Characteristic Curve Groups .............................................................................................................. A-2
Timing Accuracy ...............................................................................................................................A-17
Fixed Time Characteristic.................................................................................................................A-17
Figures
Figure A-1. Instantaneous Characteristic Curves......................................................................................A-1
Figure A-2. Short Inverse (S) Time Characteristic Curve (SW3-3 Off, Similar to ABB CO-2) ..................A-3
Figure A-3. Long Inverse (L) Time Characteristic Curve (SW3-3 Off, Similar to ABB CO-5) ...................A-4
Figure A-4. Definite Time (D) Time Characteristic Curve (Similar to ABB CO-6) .....................................A-5
Figure A-5. Moderately Inverse (M) Time Characteristic Curve (Similar to ABB CO-7) ...........................A-6
Figure A-6. Inverse (I) Time Characteristic Curve (SW3-3 Off, Similar to ABB CO-8) .............................A-7
Figure A-7. Very Inverse (V) Time Characteristic Curve (SW3-3 Off, Similar to ABB CO-9)....................A-8
Figure A-8. Extremely Inverse (E) Time Characteristic Curve (SW3-3 Off, Similar to ABB CO-11) .........A-9
Figure A-9. BS142 Very Inverse (BS142-B) Time Characteristic Curve .................................................A-10
Figure A-10. BS142 Extremely Inverse (BS142-C) Time Characteristic Curve ......................................A-11
Figure A-11. Short Inverse (S2) Time Characteristic Curve (SW3-3 On, Similar to GE IAC 55) ............A-12
Figure A-12. Long Inverse (L2) Time Characteristic Curve (SW3-3 On, Similar to GE IAC 66) .............A-13
Figure A-13. Inverse (I2) Time Characteristic Curve (SW3-3 On, Similar to GE IAC 51) .......................A-14
Figure A-14. Very Inverse (V2) Time Characteristic Curve (SW3-3 On, Similar to GE IAC 53) .............A-15
Figure A-15. Extremely Inverse (E2) Time Characteristic Curve (SW3-3 On, Similar to GE IAC 77) .... A-16
Figure A-16. Integrating Reset Characteristic Curve...............................................................................A-17
Tables
Table A-1. Time Characteristic Curve Constants with Switch SW3-3 Open (Off).....................................A-2
Table A-2. Time Characteristic Curve Constants with Switch SW3-3 Closed (On) .................................. A-2
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