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Understanding Sources of Power Disturbances for Improved System Reliability

Learn about various sources of power disturbances such as lightning, switching, faults, loads, and equipment failures. Discover how to mitigate issues related to voltage fluctuations, harmonics, noise, and more for better operational performance.

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Understanding Sources of Power Disturbances for Improved System Reliability

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  1. SOURCES OF POWER DISTURBANCES

  2. Impulsive: Lightning,switching ,impulses, utility fault clearing Oscillatory: Switching of inductive/capacitive load Interruption Switching, utility faults, circuit breaker tripping, component failures Sag Startup loads, faults Undervoltage Utility faults, load changes

  3. Swell Load changes, utility faults Overvoltage Load changes, utility faults DC offset Faulty rectifiers, power supplies Harmonics Electronic loads (non-linear loads) Interharmonics Control signals, faulty equipment,cycloconverters, frequency converters, induction motors, arcing devices Notching Variable speed drives, arc welders, light dimmers

  4. Noise Transmitters (radio), faulty equipment, ineffective grounding, proximity to EMI/RFI source Voltage fluctuations Transmitters (radio), faulty equipment, ineffective grounding, proximity to EMI/RFI source Power frequency variations Intermittent operation of load equipment

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