Evaluation method for determining of the probability of an asymmetrical fault location in a distribution network and a monitoring system for performing such method
Result description
The present invention relates to a method of determining probability of unsymmetrical failure occurrence points in electrical networks, where a backward chart of monitored distribution system is created, a coordination time of a failure occurrence is evaluated based on exceeding a change limit of a current negative phase-sequence component, records of change of a voltage negative phase-sequence component recorded on secondary sides of the distribution transformers (VN/NN) and records of negative phase-sequence components of currents withdrawn from feeding transformers (VVN/VN) are collected for the given coordination time of the failure occurrence. Subsequently, values of maximum change in the current and voltage negative phase-sequence components, corresponding to the instant at which the sum of all the recorded changes in the voltage negative phase-sequence components is maximal are determined. The values of the maximum change in the voltage negative phase-sequence components are converted to the primary side of a corresponding distribution transformer (VN/NN). Individual deviations of absolute values of the calculated changes of the voltage negative phase-sequence component and recorded values of the maximum change in the voltage phase-sequence component at the individual measuring nodes (MU) are then calculated from the converted maximum changes in the voltage phase-sequence components and the current phase-sequence components. Then total deviations of the absolute values of the calculated changes in voltage phase-sequence components and recorded values of the maximum changes in the voltage phase-sequence components for the individual nodes are calculated, and finally, a probability of occurrence of the asymmetry source in individual points of the monitored system is calculated.
Keywords
earth faultlocalizationunsymmetrical faultnegative sequencevoltage sag
The result's identifiers
Result code in IS VaVaI
Result on the web
https://register.epo.org/application?number=EP15163595&tab=main
DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Evaluation method for determining of the probability of an asymmetrical fault location in a distribution network and a monitoring system for performing such method
Original language description
The present invention relates to a method of determining probability of unsymmetrical failure occurrence points in electrical networks, where a backward chart of monitored distribution system is created, a coordination time of a failure occurrence is evaluated based on exceeding a change limit of a current negative phase-sequence component, records of change of a voltage negative phase-sequence component recorded on secondary sides of the distribution transformers (VN/NN) and records of negative phase-sequence components of currents withdrawn from feeding transformers (VVN/VN) are collected for the given coordination time of the failure occurrence. Subsequently, values of maximum change in the current and voltage negative phase-sequence components, corresponding to the instant at which the sum of all the recorded changes in the voltage negative phase-sequence components is maximal are determined. The values of the maximum change in the voltage negative phase-sequence components are converted to the primary side of a corresponding distribution transformer (VN/NN). Individual deviations of absolute values of the calculated changes of the voltage negative phase-sequence component and recorded values of the maximum change in the voltage phase-sequence component at the individual measuring nodes (MU) are then calculated from the converted maximum changes in the voltage phase-sequence components and the current phase-sequence components. Then total deviations of the absolute values of the calculated changes in voltage phase-sequence components and recorded values of the maximum changes in the voltage phase-sequence components for the individual nodes are calculated, and finally, a probability of occurrence of the asymmetry source in individual points of the monitored system is calculated.
Czech name
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Czech description
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Classification
Type
P - Patent
CEP classification
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OECD FORD branch
20704 - Energy and fuels
Result continuities
Project
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Patent/design ID
EP2940483
Publisher
EPO_1 -
Publisher name
European Patent Office
Place of publication
Munich, The Hague, Berlin, Vienna, Brussels
Publication country
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Date of acceptance
Apr 5, 2017
Owner name
Vysoké ucení technické v Brne Antonínská 548/1 60190 Brno / CZ
Method of use
A - Výsledek využívá pouze poskytovatel
Usage type
A - K využití výsledku jiným subjektem je vždy nutné nabytí licence
Basic information
Result type
P - Patent
OECD FORD
Energy and fuels
Year of implementation
2017