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Figure 1123 Capacitively coupled
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105 1 095 1/RCF 09 085 08 075 07 10 N:5 100 Equivalent circuit for determining CT frequency response primary ideal secondary transformer winding winding Zp Zs Ze Cs Zb
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exciting stray impedance capacitance burden 1000 10000 100000 1000000
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Figure 1124 Frequency response of a window-type CT
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conductor and is used to shunt the line current through the CT in the insulator This method allows the device to be installed on the crossarm in place of the original insulator By using the split-core choke, the phase conductor does not have to be broken, and thus, the transducers can be installed on a live line Initial tests indicated adequate frequency response for these transducers However, field experience with these units has shown that the frequency response, even at 60 Hz, is dependent on current magnitude, temperature, and secondary cable length This makes this type of device difficult to use for accurate power quality monitoring Care must be exercised in matching these transducers to the instruments In general, all primary sites should be monitored with metering class VTs and CTs to obtain accurate results over the required frequency spectrum Installation will require a circuit outage, but convenient designs can be developed for pole-top installations to minimize the outage Another option for monitoring primary sites involves monitoring at the secondary of an unloaded distribution transformer This will give accurate results up to at least 3 kHz This option does not help with the current transducers, but it is possible to get by without the currents at some circuit locations (eg, end of the feeder) This option may be particularly attractive for underground circuits where the monitor can be installed on the secondary of a pad-mounted transformer
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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
Power Quality Monitoring 494 Eleven
Primary wound CTs are available from a variety of CT manufacturers Reference 2 concludes that any primary wound CT with a single turn, or very few turns, should have a frequency response up to 10 kHz
End-user (secondary) sites Transducer requirements at secondary sites are much simpler Direct connection for the voltage is possible for 120/208- or 277/480-V rms systems This permits full utilization of the instrument s frequency-response capability Currents can be monitored with either metering CTs (at the service entrance, for example) or with clamp-on CTs (at locations within the facility) Clamp-on CTs are available in a wide range of turns ratios The frequency range is usually published by the manufacturer
Summary of transducer recommendations Table 112 describes different monitoring locations and the different types of transducers that are adequate for monitoring at these locations Table 113 describes the different power quality phenomena and the proper transducers to measure that type of power quality problem Tables 112 and 113 should be used in conjunction with each other to determine the best transducer for a given application Summary of monitoring equipment capabilities
Figure 1125 summarizes the capabilities of the previously described metering instruments as they relate to the various categories of power quality variations 114 Assessment of Power Quality Measurement Data As utilities and industrial customers have expanded their power quality monitoring systems, the data management, analysis, and interpretation functions have become the most significant challenges in the overall power quality monitoring effort In addition, the shift in the use of power quality monitoring from off-line benchmarking to on-line operation with automatic identification of problems and concerns has made the task of data management and analysis even more critical There are two streams of power quality data analysis, ie, off-line and on-line analyses The off-line power quality data analysis, as the term suggests, is performed off-line at the central processing locations On the other hand, the on-line data analysis is performed within the instrument itself for immediate information dissemination Both types of power quality data assessment are described in Secs 1141 and 1142
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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