how to print barcode in asp net c# Power Quality Monitoring 458 Eleven in Software

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Figure 111 Form for recording supply transformer test data
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1112 Determining what to monitor
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Power quality encompasses a wide variety of conditions on the power system Important disturbances can range from very high frequency impulses caused by lightning strokes or current chopping during circuit interruptions to long-term overvoltages caused by a regulator tap switching problem The range of conditions that must be characterized creates challenges both in terms of the monitoring equipment performance specifications and in the data-collection requirements 2 details var-
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Power Quality Monitoring Power Quality Monitoring 459
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Figure 112 Form for recording feeder circuit test data (from panel)
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ious categories of power quality variations along with methods for characterizing the variations and the typical causes of the disturbances The methods for characterizing the quality of ac power are important for the monitoring requirements For instance, characterizing most transients requires high-frequency sampling of the actual waveform Voltage sags can be characterized with a plot of the rms voltage versus time Outages can be defined simply by a time duration Monitoring to characterize harmonic distortion levels and normal voltage variations requires steady-state sampling with results analysis of trends over time Extensive monitoring of all the different types of power quality variations at many locations may be rather costly in terms of hardware, communications charges, data management, and report preparation Hence, the priorities for monitoring should be determined based on the objectives of the effort Projects to benchmark system performance should involve a reasonably complete monitoring effort Projects designed to evaluate compliance with IEEE Standard 519-1992 for harmonic distortion levels may only require steady-state monitoring of harmonic levels Other projects focused on specific industrial problems may only require monitoring of rms variations, such as voltage sags
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Power Quality Monitoring 460 Eleven
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Figure 113 Form for recording branch circuit test data (from panel)
Figure 114 Form for recording test data at individual loads
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Power Quality Monitoring Power Quality Monitoring 461
1113 Choosing monitoring locations
Obviously, we would like to monitor conditions at virtually all locations throughout the system to completely understand the overall power quality However, such monitoring may be prohibitively expensive and there are challenges in data management, analysis, and interpretation Fortunately, taking measurements from all possible locations is usually not necessary since measurements taken from several strategic locations can be used to determine characteristics of the overall system Thus, it is very important that the monitoring locations be selected carefully based on the monitoring objectives We now present examples of how to choose a monitoring location The monitoring experience gained from the EPRI DPQ project1 provides an excellent example of how to choose monitoring locations The primary objective of the DPQ project was to characterize power quality on the US electric utility distribution feeders Actual feeder monitoring began in June 1992 and was completed in September 1995 Twentyfour different utilities participated in the data-collection effort with almost 300 measurement sites Monitoring for the project was designed to provide a statistically valid set of data of the various phenomena related to power quality Since the primary objective was to characterize power quality on primary distribution feeders, monitoring was done on the actual feeder circuits One monitor was located near the substation, and two additional sites were selected randomly (see Fig 115) By randomly choosing the remote sites, the overall project results represented power quality on distribution feeders in general It may not be realistic, however, to assume that the three selected sites completely characterized power quality on the individual feeders involved When a monitoring project involves characterizing specific power quality problems that are actually being experienced by customers on the distribution system, the monitoring locations should be at actual customer service entrance locations because it includes the effect of step-down transformers supplying the customer Data collected at the service entrance can also characterize the customer load current variations and harmonic distortion levels Monitoring at customer service entrance locations has the additional advantage of reduced transducer costs In addition, it provides indications of the origin of the disturbances, ie, the utility or the customer side of the meter Another important aspect of the monitoring location when characterizing specific power quality problems is to locate the monitors as close as possible to the equipment affected by power quality variations It is important that the monitor sees the same variations that the sensitive equipment sees High-frequency transients, in particular, can be significantly different if there is significant separation between the monitor and the affected equipment
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