April 2015

POWER QUALITY PROBLEMS IEEE

IEEE defined power quality disturbances into seven categories based on wave shape: 1. Transients 2. Interruptions 3. Sag/ Under voltage 4. Swell/ Overvoltage 5. Waveform distortion 6. Voltage fluctuations 7. Frequency variations 1. TRANSIENTS Potentially the most damaging type of power disturbance, transients fall into two subcategories: 1. Impulsive 2. Oscillatory more » 2. INTERRUPTIONS

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WHAT IS GROUNDING

There are several important reasons why a grounding system should be installed. But the most important reason is to protect people! Secondary reasons include protection of structures and equipment from unintentional contact with energized electrical lines. The grounding system must ensure maximum safety from electrical system faults and lightning. A good grounding system must receive

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TYPES OF SUBSYNCHRONOUS RESONANCE INTERACTIONS

There are several ways in which the system and the generator may interact with subsynchronous effects. A few of these interactions are basic in concept and have been given special names. We mention three of these that are of particular interest: Induction generator effect Torsional interaction Transient torque Each of the above effects will be

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