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3 Electrical Power Quality and Utilisation. Journal

3 2007

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The effect of the Integration Interval on the Measurement Accuracy of rms Values and Powers in Systems with Nonsinusoidal Wavefo

Peretto L., Willems J. L., Emanuel A. E.

Electrical Power Quality and Utilisation. Journal

2007

Vol. 13, nr 1

113-119

In this paper the possibility of errors in the measurement of average values (in particular rms values or active powers) in power systems under nonsinusoidal conditions are discussed. The errors considered are either due to the fact that the measurement time interval is not an exact multiple of the fundamental period of the voltage and current signals, or due to the presence of interharmonics or subharmonics. The errors are calculated and the results are illustrated by means of simple examples.

Performance Evaluation of a Multifunctional Energy Metering IC under Sinusoidal and Non-Sinusoidal Conditions

Pasini G., Peretto L., Pivello E., Tinarelli R.

Electrical Power Quality and Utilisation. Journal

2007

Vol. 13, nr 1

67-73

Low-cost handheld instruments performing a large variety of electrical measurements are recently appeared on the market. Their diffusion is mainly due to the availability of integrated circuits that carry out many measurement functions, thus simplifying the instrument implementation and reducing the costs. In this paper, the accuracy performances of an integrated circuit featuring rms and power measurements are evaluated under both sinusoidal and non-sinusoidal conditions. The implemented measurement bench and the obtained results are presented. The results show that the accuracy of the device under test is satisfactory for active power and current rms values, instead of the voltage channel accuracy is significantly worst.

Assessment of Fault Location in Power Distribution Networks

Borghetti A., Bosetti M., Di Silvestro M., Nucci C. A., Paolone M., Peretto L., Scala E., Tinarelli R.

Electrical Power Quality and Utilisation. Journal

2007

Vol. 13, nr 1

33-41

Methods aimed at locating the position where a fault is occurred can be seen as part of a complex measurement system oriented at more general power quality purposes. This paper faces the comparison between two methods recently proposed in literature for fault-location in distribution networks, based on a distributed and on a single-ended measurement system, respectively. By assuming a common distribution system topology, the two methods are applied in order to compare their performances as well as the obtained results. On the basis of the different drawbacks and advantages shown by the two methods, potential improvements are eventually taken into account, and a possible integration of the two approaches is investigated and discussed.