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  • Testers designed to assess the main (i.e., most important) disturbances of the fundamental and/or harmonic components of electric power lines during total or partial failures. These testers can usually measure the variations in line variables such as amplitude, phase angle, frequency, and power in real time; some testers can also perform other assessments, including transient and/or harmonic analysis. Power line disturbance testers are intended for testing after electrical power lines are installed or modified, during some preventive maintenance procedures, and for routine checking of electrical power line status in a facility.
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