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Marine electrical  system integrity
 

Marine electrical system integrity

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    Marine electrical  system integrity Marine electrical system integrity Presentation Transcript

    • Marine Electrical System IntegrityOladokun Sulaiman Olanrewaju
    • Electrical Safety• Electric shock• Over current• Thermal hazard• Safely procedure
    • Electrical instrumentElectrical Instrument • Measuring instruments• Analogue • Ammeter• Digital • VoltmeterMeasurement • Ohmmeter-voltage • Multimeter-Current • Insulation tester- Resistance • Wattmeter- Power • Watt-hour meter • Power factor meter • Frequency meter • Voltage indicator • Phase sequence indicator • Earth loop tester • Earth resistance tester • Phase stick tester
    • Meter specification• Types of meter• Max measuring value• Accuracy• Operating temperature• Resolution• Types of supply (AC or DC)• Connection method• Percentage error• Maximum surge current• location
    • Continuity test• to check condition of current path• Correct condition• Condition of circuit and equipment• For ie cable, coil, winding-ohmmeter testGood- low ohm readingMalfuntion- high or infinit ohm reading-buzzer test-lamp test
    • Resistance test• To check condition of equipment winding or coilGood- small resistance- 3 phase expected to have equal resistance value
    • Insulation resistance test• Check condition of insulation materialTypes-Hand crankingBattery operatedAcceptable values of output250V DC - extra low voltage – 0.5 M- Ohm500V DC - <500V - 0.5 M- Ohm1000V DC – 1000V – 1.0 M-Ohm
    • Test procedure• For equipment - Remove equipment from circuit• Testing-1 phase- between coil or winding to ground or body-3 phase- between winding to winding or pole to pole-Between each windingFor cable or circuitRemove cable /circuit from supply and loadTesting1 phase- between phase to neutral, phase to earth and neutral to earth3phase- between phase to phase, each phase to neutral, each phase to body or earth, neutral to earth
    • Current injection test• Primary injectionCT ratio, connection, polarityStability and sensitivity of protection• Secondary injection• To check relay performance- operating current at various TMS and PMS using injection tester
    • Pressure test• Insulation property of HV• - 2 times voltage is supplied for 1min of AC, and 10min of DC
    • Earthling testing• Test earthing system items earth loop independence, earth electrode resistance