Power Quality Monitoring


Power Quality Monitoring

  • In order to improve power quality, the sources and causes of the disturbances must be known before appropriate mitigating actions can be taken. A feasible approach to achieve this goal is to incorporate detection capabilities into Power Quality monitoring equipment so that events of interest will be recognized, captured, and classified automatically. Hence, good performance monitoring equipment must have functions which involve the detection, localization, and classification of transient events.
  • In particular, when the disturbance type has been classified accurately, the power-quality engineers can define the major effects of the disturbance at the load and analyze the source of the disturbances so that an appropriate solution can be formulated (IEEE 1981 and IEEE 1993).

  • In a modern power system, the objective of continuous supply of electric energy has made the power quality become an issue of utmost importance. In order to maintain an expected level of electric power quality, some practices have been suggested to help to restrict the ever-increasing level of waveform distortion caused by the proliferation of nonlinear electronic circuits.
  • Many utilities have also installed dedicated monitoring devices such that the warning alarms can be earlier acquired in order to detect all possible power-quality events. One of the important issues in power quality analysis is to detect and classify disturbance wave forms automatically in an efficient manner. To detect, to solve, and to mitigate the power quality problem, many utilities perform power quality monitoring for their industrial and key customers. In the deregulated market, the power quality monitoring would be an effective means for providing better customer services as well as reinforcing competitiveness among the utilities.
  • The selection of Power Quality monitoring locations will depend on the facility design, the critical loads, the power conditioning equipment and the specific objectives of monitoring. At the minimum, the monitoring should include the utility supply locations, outputs of power conditioning equipment and the backup generators. Monitoring multiple locations over an extended period of time will provide a profile of the conditions on the distribution network.
  • Current and voltage profiles should be measured for periods when the circuit is under typical loading. Measurements taken during periods when the circuit is lightly loaded may provide an inaccurate picture of the harmonic conditions.
  • The traditional reactive approach of power quality monitoring may not be appropriate for all situations. Measurement of power quality requires the use of proper instrumentation to suit the application. The user of the instrument must be well trained in the use and care of the instrumentation. The engineer should be knowledgeable in the field of power quality.


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