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Aplication Guide
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DOA 2.1
CONTENTS
1. INTRODUCTION
2
1.1 Protection of Underground and Overhead Lines
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1.2 SAM DOA 2.1 Overcurrent Relay
3
2. EARTH AND PHASE CURRENT OVERCURRENT FUNCTIONS 6
2.1 Instantaneous function (50/50N)
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2.2 DMT thresholds
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2.3 IDMT thresholds
8
2.3.1 Inverse time curves
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2.4 Reset timer
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2.5 Time graded protection
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3. TRANSFORMER INRUSH CURRENTS
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4. BLOCKING LOGIC FUNCTION
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5. SETTING GROUP SELECTION
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6. Scheme of operation
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7. Scheme of operation for general connection of relay
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