The use of phase voltage modules to select the damaged phase in case of single-phase earth faults
In case of short circuits, the selection of damaged phases always precedes the determination of the damage location. To select the damaged phase, filter selector of the damaged phase are widely used, using symmetrical components of phase currents. In networks with an isolated neutral, the phase c...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Omsk State Technical University, Federal State Autonoumos Educational Institution of Higher Education
2023-09-01
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| Series: | Омский научный вестник |
| Subjects: | |
| Online Access: | https://www.omgtu.ru/general_information/media_omgtu/journal_of_omsk_research_journal/files/arhiv/2023/%E2%84%963%20(187)%20(%D0%9E%D0%9D%D0%92)/92-100%20%20%D0%A8%D0%B0%D0%B1%D0%B0%D0%BD%D0%BE%D0%B2%20%D0%92.%20%D0%90.,%20%D0%A1%D0%BE%D1%80%D0%BE%D0%BA%D0%B8%D0%BD%20%D0%90.%20%D0%92..pdf |
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| Summary: | In case of short circuits, the selection of damaged phases always precedes the
determination of the damage location. To select the damaged phase, filter selector
of the damaged phase are widely used, using symmetrical components of phase
currents. In networks with an isolated neutral, the phase currents during a ground
fault are determined mainly by load currents and in most cases the phase current
of the damaged phase differs little from the currents in the undamaged phases.
Therefore, phase currents and their symmetrical components are not used to select
the damaged phase in single-phase short circuits. To select the damaged phase in
networks with an isolated neutral, the properties of the phase voltage modules
and the neutral offset voltage are used. Single-phase earth faults occur, as a rule,
through fault resistances, the values of which can reach several thousand ohms.
Therefore, the study of devices for selecting the damaged phase using voltage
modules with single-phase earth faults through significant fault resistances is an
urgent task.
The purpose of the article is to investigate the properties and consider the directions
of improvement of damaged phase sensors using phase voltage modules, to
determine the areas of their selective action depending on the magnitude of the
fault resistance at the point of damage. Describe algorithms in which the voter will
act selectively both with metal damages and with damages through fault resistance. |
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| ISSN: | 1813-8225 2541-7541 |