## Abstract

Two and three phase short-circuit positioning technology and accuracy of different cases in radial distribution networks are studied in this research. Different factors, e.g. behaviour of the short-circuit current, properties of measuring transformers and errors of the electronics of the measuring devices, effecting on the accuracy of computational positioning are estimated in the beginning of the report. When the failure positioning is based only on the measurement of failure currents, the results are effected by the magnitude of the failure resistance. Additionally, in some cases the current of load of the network during the failure might effect on the results. The accuracy of short-circuit positioning was studied using both current and voltage measurement and plain current measurement, divided into cases in which the measurement is made either in the beginning of the faulty wire or in the cell of the feed-transformer. When the measurements of both voltage and current are available, the effect of load-current can be compensated so that the difference between measurements from the wire and transformer does not become too high. The positioning error of long distance faults is about 5 % of the fault-distance. If only the current measurement is available, it is only possible to
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Lehtonen, M

^{[1] }- Technical Research Centre of Finland, Espoo (Finland). Lab. of Electrical and Automation Engineering

## Citation Formats

Lehtonen, M.
Computational positioning of failures in electricity distribution networks. Two and three phase short-circuits; Saehkoenjakeluverkon vikojen laskennallinen paikallistaminen. Kaksi- ja kolmivaiheiset oikosulut.
Finland: N. p.,
1992.
Web.

Lehtonen, M.
Computational positioning of failures in electricity distribution networks. Two and three phase short-circuits; Saehkoenjakeluverkon vikojen laskennallinen paikallistaminen. Kaksi- ja kolmivaiheiset oikosulut.
Finland.

Lehtonen, M.
1992.
"Computational positioning of failures in electricity distribution networks. Two and three phase short-circuits; Saehkoenjakeluverkon vikojen laskennallinen paikallistaminen. Kaksi- ja kolmivaiheiset oikosulut."
Finland.

@misc{etde_10111615,

title = {Computational positioning of failures in electricity distribution networks. Two and three phase short-circuits; Saehkoenjakeluverkon vikojen laskennallinen paikallistaminen. Kaksi- ja kolmivaiheiset oikosulut}

author = {Lehtonen, M}

abstractNote = {Two and three phase short-circuit positioning technology and accuracy of different cases in radial distribution networks are studied in this research. Different factors, e.g. behaviour of the short-circuit current, properties of measuring transformers and errors of the electronics of the measuring devices, effecting on the accuracy of computational positioning are estimated in the beginning of the report. When the failure positioning is based only on the measurement of failure currents, the results are effected by the magnitude of the failure resistance. Additionally, in some cases the current of load of the network during the failure might effect on the results. The accuracy of short-circuit positioning was studied using both current and voltage measurement and plain current measurement, divided into cases in which the measurement is made either in the beginning of the faulty wire or in the cell of the feed-transformer. When the measurements of both voltage and current are available, the effect of load-current can be compensated so that the difference between measurements from the wire and transformer does not become too high. The positioning error of long distance faults is about 5 % of the fault-distance. If only the current measurement is available, it is only possible to estimate the maximum fault-distance. The actual fault-distance can be about 10-15 % shorter than calculated due to fault-currents. Additionally, the other factors causes a maximum error of 7 %, which must be added into the error of fault-resistance. In addition to short-circuits, a short review is given on positioning of ground contacts.}

place = {Finland}

year = {1992}

month = {Dec}

}

title = {Computational positioning of failures in electricity distribution networks. Two and three phase short-circuits; Saehkoenjakeluverkon vikojen laskennallinen paikallistaminen. Kaksi- ja kolmivaiheiset oikosulut}

author = {Lehtonen, M}

abstractNote = {Two and three phase short-circuit positioning technology and accuracy of different cases in radial distribution networks are studied in this research. Different factors, e.g. behaviour of the short-circuit current, properties of measuring transformers and errors of the electronics of the measuring devices, effecting on the accuracy of computational positioning are estimated in the beginning of the report. When the failure positioning is based only on the measurement of failure currents, the results are effected by the magnitude of the failure resistance. Additionally, in some cases the current of load of the network during the failure might effect on the results. The accuracy of short-circuit positioning was studied using both current and voltage measurement and plain current measurement, divided into cases in which the measurement is made either in the beginning of the faulty wire or in the cell of the feed-transformer. When the measurements of both voltage and current are available, the effect of load-current can be compensated so that the difference between measurements from the wire and transformer does not become too high. The positioning error of long distance faults is about 5 % of the fault-distance. If only the current measurement is available, it is only possible to estimate the maximum fault-distance. The actual fault-distance can be about 10-15 % shorter than calculated due to fault-currents. Additionally, the other factors causes a maximum error of 7 %, which must be added into the error of fault-resistance. In addition to short-circuits, a short review is given on positioning of ground contacts.}

place = {Finland}

year = {1992}

month = {Dec}

}