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Regardless of the type of instrumentation needed for a particular test, there are a number of important factors that should be considered when selecting the instrument Some of the more important factors include
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Number of channels (voltage and/or current) Temperature specifications of the instrument Ruggedness of the instrument Input voltage range (eg, 0 to 600 V) Power requirements Ability to measure three-phase voltages Input isolation (isolation between input channels and from each input to ground) Ability to measure currents Housing of the instrument (portable, rack-mount, etc) Ease of use (user interface, graphics capability, etc) Documentation Communication capability (modem, network interface) Analysis software
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The flexibility (comprehensiveness) of the instrument is also important The more functions that can be performed with a single instrument, the fewer the number of instruments required Recognizing that there is some crossover between the different instrument categories, we discuss the basic categories of instruments for direct measurement of power signals in Secs 1132 to 11312
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1132 Wiring and grounding testers
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Many power quality problems reported by end users are caused by problems with wiring and/or grounding within the facility These problems can be identified by visual inspection of wiring, connections, and panel boxes and also with special test devices for detecting wiring and grounding problems Important capabilities for a wiring and grounding test device include
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Detection of isolated ground shorts and neutral-ground bonds Ground impedance and neutral impedance measurement or indication Detection of open grounds, open neutrals, or open hot wires Detection of hot/neutral reversals or neutral/ground reversals
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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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Power Quality Monitoring Power Quality Monitoring 473
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Three-phase wiring testers should also test for phase rotation and phase-to-phase voltages These test devices can be quite simple and provide an excellent initial test for circuit integrity Many problems can be detected without the requirement for detailed monitoring using expensive instrumentation
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1133 Multimeters
After initial tests of wiring integrity, it may also be necessary to make quick checks of the voltage and/or current levels within a facility Overloading of circuits, undervoltage and overvoltage problems, and unbalances between circuits can be detected in this manner These measurements just require a simple multimeter Signals used to check for these include
Phase-to-ground voltages Phase-to-neutral voltages Neutral-to-ground voltages Phase-to-phase voltages (three-phase system) Phase currents Neutral currents
The most important factor to consider when selecting and using a multimeter is the method of calculation used in the meter All the commonly used meters are calibrated to give an rms indication for the measured signal However, a number of different methods are used to calculate the rms value The three most common methods are 1 Peak method Assuming the signal to be a sinusoid, the meter reads the peak of the signal and divides the result by 1414 (square root of 2) to obtain the rms 2 Averaging method The meter determines the average value of a rectified signal For a clean sinusoidal signal (signal containing only one frequency), this average value is related to the rms value by a constant 3 True rms The rms value of a signal is a measure of the heating that will result if the voltage is impressed across a resistive load One method of detecting the true rms value is to actually use a thermal detector to measure a heating value More modern digital meters use a digital calculation of the rms value by squaring the signal on a sampleby-sample basis, averaging over the period, and then taking the square root of the result These different methods all give the same result for a clean, sinusoidal signal but can give significantly different answers for distorted signals This is very important because significant distortion levels are
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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