faults instrument transformers correlation to drawings ... · instrument transformers correlation...
TRANSCRIPT
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Faults Relays Instrument Transformers Correlation to Drawings
One LinesAC SchematicsDC Schematics
Other Types of Protection Coordination of Relays
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Protect Personnel Protect Equipment Isolate Fault to Smallest
Affected Area
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1) Trip during fault2) Trip during overload3) Trip during over/under voltage4) Trip during over/under frequency
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5) Don’t trip during inrush6) Don’t trip during cold load
restoration 7) Don’t trip during “normal”
conditions
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Abnormal Current Abnormal Voltage Abnormal Frequency Combination of any of the
Above
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Pre Fault
Breaker OpensAØ Fault
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Grounding Cables Trees Splices Terminations Weather
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Continuously Monitors Power System
Sends a signal to Trip Circuit Breaker or Recloser during abnormal conditions (faults)
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Line (Distance and Differential) Transformer (Differential) Bus (Differential) Feeder (Overcurrent)
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Line
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Transformer Differential
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Bus Differential
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Relay Testing
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PTs
CTs
Instrument Transformers
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PT
PT
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CT
CT
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CTCT
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One-line Diagrams
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Primary vs. Secondary
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Line
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Transformer Differential
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Three-line Diagrams
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Line
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DC Schematics
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Transformer Fuses Reclosers Sectionalizers
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Transformer Fuse Protection
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Transformer Fuse
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Recloser
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RecloserController
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Recloser
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Time Current Curves
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Questions?