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Condition Monitoring Of Electrical Assets

Condition Monitoring Of Electrical Assets. What is condition monitoring.Using various technologies to monitor the current performance of a piece of equipment to determine if it is operating within specified guidelines.The results obtained from the monitoring along with previous results can give

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Condition Monitoring Of Electrical Assets

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    1. Condition Monitoring Of Electrical Assets Stephen Pierce Condition Monitoring Officer AGL – Torrens Island Power Station

    2. Condition Monitoring Of Electrical Assets What is condition monitoring. Using various technologies to monitor the current performance of a piece of equipment to determine if it is operating within specified guidelines. The results obtained from the monitoring along with previous results can give an indication to the life assessment of the equipment and assist in determining the nature of any abnormality.

    3. Condition Monitoring Of Electrical Assets Types of condition monitoring. Thermography Motor testing Transformer oil analysis Battery testing Ultrasonics Vibration Lube oil analysis

    4. Condition Monitoring Of Electrical Assets Thermography inspections Using infrared imaging equipment to capture the infrared radiation from a specific piece of equipment to determine if it is operating within its normal performance specifications. Switchgear and Control gear Assemblies (AS3439) Terminals of load cables; 70?C Temperature rise limit. External covers; Metal, 30?C Temperature rise limit. Insulating, 40?C Temperature rise limit. Fuses (AS60269.1) Contacts – tin plated; Spring, 60?C Temperature rise limit. Bolted; 65?C Temperature rise limit.

    5. Condition Monitoring Of Electrical Assets Thermography Inspecting the HT bushings on a 13.8/275kV 144 MVA step up transformer.

    6. Condition Monitoring Of Electrical Assets Thermography Inspecting the HT bushings on a 13.8/275kV step up transformer.

    7. Condition Monitoring Of Electrical Assets Thermography 13.8/6.6kV 7.5 MVA Transformer – Cooling fins. Ambient temperature 13°C, load on 6.6kV side was 455 amps.

    8. Condition Monitoring Of Electrical Assets Thermography 220V DC system, from battery charger to the batteries and inverter. Three diodes in parallel, load approximately 55 amps

    9. Condition Monitoring Of Electrical Assets Motor testing Insulation testing Using the appropriate equipment to test the quality of the insulation from phase to earth and between phases to determine if it will withstand the applied voltage. 415V Motors – 1kV DC 6.6kV Motors – 5 kV DC If conducting a one minute test, temperature correction should be applied. Resistance changes with temperature. Select a base temperature (20°C) and correct readings to that for more reliable results.

    10. Condition Monitoring Of Electrical Assets Motor testing Testing the insulation on a 415V motor, windings to the frame.

    11. Condition Monitoring Of Electrical Assets

    12. Condition Monitoring Of Electrical Assets Motor testing Stator Windings and Rotor Checking for shorted turns within the windings or shorts between the windings. Checking for rotor faults (cracked rotor bars)

    13. Condition Monitoring Of Electrical Assets Motor testing Testing the windings on a 415V motor, across a set of windings.

    14. Condition Monitoring Of Electrical Assets Motor testing Testing the rotor on a 415V motor, across a set of windings.

    15. Condition Monitoring Of Electrical Assets Motor testing Testing the rotor on a 415V motor.

    16. Condition Monitoring Of Electrical Assets Motor testing – Rotor test (Alltest IV Pro 2000)

    17. Condition Monitoring Of Electrical Assets Transformer oil analysis Transformer oil samples are taken on a six or twelve monthly basis depending on the criticality of the equipment. Samples are taken for both dissolved gas analysis (DGA) and oil quality. Samples are sent off site for analysis with reports supplied showing the current results and the previous four results for trending purposes. Suitability of results are obtained from a number of standards. IEC 60599 – Mineral oil impregnated electrical equipment in service. Guide to the interpretation of dissolved and free gases analysis.

    18. Condition Monitoring Of Electrical Assets Transformer oil analysis

    19. Condition Monitoring Of Electrical Assets Battery maintenance and testing Battery testing is carried out as per the relevant Australian Standard. Three different types of maintenance inspection. Monthly Quarterly (includes monthly) Yearly (includes quarterly and monthly) AS 2676.1 – 1992; Vented cells AS 2676.2 – 1992; Sealed cells Guide to the installation, maintenance, testing and replacement of secondary batteries in building

    20. Condition Monitoring Of Electrical Assets Battery testing Using a digital hydrometer, records specific gravity and temperature.

    21. Condition Monitoring Of Electrical Assets Battery testing Using an impedance tester, also records voltage,

    22. Condition Monitoring Of Electrical Assets Battery testing Results of a routine test, showing, voltage, impedance and specific gravity for each cell of a 110V battery bank.

    23. Condition Monitoring Of Electrical Assets Battery testing Voltage measurements trended for each cell over a three year period on a 110V battery bank.

    24. Condition Monitoring Of Electrical Assets Ultrasonics The detection of sound above the 20kHz range. This is in a range that is not audible to the human ear. Most humans can hear between about 20Hz up to 20kHz In the electrical area can be used to detect. Corona (voltages above 1kV required for corona to be produced) Arcing Tracking The type of sound recorded determines the type of electrical disturbance. Sound levels are recorded in a percentage or dB (depending on equipment). Levels can be trended to monitor for deterioration.

    25. Condition Monitoring Of Electrical Assets Ultrasonics Listening to 275kV HT bushings on a transformer.

    26. Condition Monitoring Of Electrical Assets Ultrasonics Listening to a 6.6kV circuit breaker.

    27. Condition Monitoring Of Electrical Assets Vibration and lube oil analysis Both vibration and oil analysis can provide information on the condition of a bearing (oil lubricated bearings). Vibration readings are taken in the horizontal, vertical and axial directions. Oil sampling results look for unacceptable levels of moisture, viscosity, wear metals, oil additives and particle count. Abnormalities with oil are usually evident prior to detecting abnormalities with vibration.

    28. Condition Monitoring Of Electrical Assets Vibration and lube oil analysis

    29. Condition Monitoring Of Electrical Assets Thermography and Ultrasonics Both are used as on line non contact methods of monitoring electrical assets. Can support each other and also each technology can provide specific information. Thermography can not detect corona because it does not produce heat, ultrasonics can due to the noise produced by the electrical discharge of the corona. Thermography and ultrasonics testing are done together so the plant conditions are the same.

    30. Condition Monitoring Of Electrical Assets

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