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VT and CT Options for Different Locations VT Metering VTs Special-purpose capacitive or resistive dividers Calibrated bushing taps Metering VTs Metering VTs Pad-mounted transformer Special-purpose dividers Direct connection Direct connection CT Metering CTs Relaying CTs
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VT and CT Requirements for Different Power Quality Variations VTs* Standard metering Standard metering Standard metering with high-kneepoint saturation Capacitive or resistive dividers CTs Standard metering Window-type Window-type Window-type
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Concern Voltage variations Harmonic levels Low-frequency transients (switching) High-frequency transients (lightning)
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*VTs are usually not required at locations below 600 V rms nominal
Figure 1125 Power quality measurement equipment capabilities
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Power Quality Monitoring 496 Eleven
1141 Off-line power quality data assessment
Off-line power quality data assessment is carried out separately from the monitoring instruments Dedicated computer software is used for this purpose Large-scale monitoring projects with large volumes of data to analyze often present a challenging set of requirements for software designers and application engineers First, the software must integrate well with monitoring equipment and the large number of productivity tools that are currently available The storage of vast quantities of both disturbance and steady-state measurement data requires an efficient and well-suited database Data management tools that can quickly characterize and load power quality data must be devised, and analysis tools must be integrated with the database Automation of data management and report generation tasks must be supported, and the design must allow for future expansion and customizing The new standard format for interchanging power quality data the Power Quality Data Interchange Format (PQDIF) makes sharing of data between different types of monitoring systems much more feasible This means that applications for data management and data analysis can be written by third parties and measurement data from a wide variety of monitoring systems can be accessible to these systems PQView (wwwpqviewcom) is an example of this type of third-party application The PQDIF standard is described in Sec 116 The off-line power quality data assessment software usually performs the following functions:
Viewing of individual disturbance events RMS variation analysis which includes tabulations of voltage sags and swells, magnitude-duration scatter plots based on CBEMA, ITI, or user-specified magnitude-duration curves, and computations of a wide range of rms indices such as SARFI, SIARFI, and CAIDI Steady-state analysis which includes trends of rms voltages, rms currents, and negative- and zero-sequence unbalances In addition, many software systems provide statistical analysis of various minimum, average, maximum, standard deviation, count, and cumulative probability levels Statistics can be temporally aggregated and dynamically filtered Figures 1126 and 1127 show the time trend of phase A rms voltage along with its histogram representation Harmonic analysis where users can perform voltage and current harmonic spectra, statistical analysis of various harmonic indices, and trending overtime
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Power Quality Monitoring Power Quality Monitoring 497
7700 7600 7500 7400 V RMS A 7300 7200 7100 7000 6900 6800 4/26/95 5/1/95 5/6/95 5/11/95
Samples: Minimum: Average: Maximum:
1404 68730806 72847099 76003726
5/16/95 5/21/95 5/26/95
5/31/95
6/5/95
Figure 1126 Time trend of an rms voltage is a standard feature in many power quality
analysis software programs
Samples: Minimum: Average: Maximum: 120 100 80 Count 60 40 20 0 6870 6910 6950 6990 7030 7070 7110 7150 7190 7230 7270 7310 7350 7390 7430 7470
1404 68730806 72847099 76003726 100% 90% 70% 60% 50% 40% 30% 20% 10% 0% 7510 7550 7590 Cumulative Frequency 80%
V RMS A
Figure 1127 Histogram representation of rms voltage indicates the statistical distribution of the rms voltage magnitude
Transient analysis which includes statistical analysis of maximum voltage, transient durations, and transient frequency Standardized power quality reports (eg daily reports, monthly reports, statistical performance reports, executive summaries, customer power quality summaries)
Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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