20030805

20030805 - Electrical Protection Electrical Faults Phase to...

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Electrical Protection
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Electrical Faults & Phase to phase to phase to ground
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Purpose of Protection System & Maintain electrical system stability
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Requirements of a Protection System & Sensitivity
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Some terms & Inverse time
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Protection Zones
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Simple Zone
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Double Protection "A" Bus Protection "B" Bus Protection Circuit Breaker X Bus Circuit Breaker Y CT 2 CT 3 CT 3 CT 1 Bus Zone CT 4 CT 2 CT 4 CT 1
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Protection Zones x Bus H2 Y Bus Zone H2 Bus H1 Bus Zone H1 Bus Zone H3 Bus H3 Transformer T1 Zone T1 Zone G1 G1 Transformer SST1 Zone SST1 SST1 LV Bus Bus Zone L1 Bus L1
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Breaker Failure & Minimizes the amount of equipment removed from service in event of a failure ± Not started opening in a certain time ± Not open in a certain time ± Current not broken in a certain time
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Duplicate Protection Schemes A Protection B Protection Breaker X Breaker Y Device Z Action Q Initiate Initiate Trip Trip Close Close PT CT 2 CT 1 Electrical bus Electrical System Protection Logic Protection Output Electrical Devices System Input
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Bus Protection
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Bus Protection & Differential & Under voltage
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Over-current Relay I 1P I 1S CT 2000/5 A
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20030805 - Electrical Protection Electrical Faults Phase to...

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