There are several observations presented in the paper that help us identify the cause of power quality disturbances from waveshapes. 1. Insulation breakdown causes waveshape disturbances at the peak of the voltage. 2. Loose connection faults cause waveshape disturbances in the voltage waveshape near the zero crossing of the current. 3. Capacitor energizing transients initiate a sharp transient toward the voltage zero, followed by a dampened oscillation at the power system frequency. 4. Higher frequency transients are dampened greatly by electrical distance. Normally waveshape disturbances that exhibit higher frequency characteristics indicate that the source of the disturbance is nearby.
展开▼
