Analysis of partial discharges in supporting insulators
The diagnostics of overhead power lines is an important issue in the modern electric power industry. Sometimes supporting insulators are destroyed by external factors. Cracks in insulators can cause the destruction of the insulator, which increases the electrical injuries of personnel. Therefore...
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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
2020-03-01
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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/2020/1%20(169)/32-38%20%D0%9F%D0%BE%D0%BB%D1%8F%D0%BA%D0%BE%D0%B2%20%D0%94.%20%D0%90.,%20%D0%9D%D0%B8%D0%BA%D0%B8%D1%82%D0%B8%D0%BD%20%D0%9A.%20%D0%98.,%20%D0%A2%D0%B5%D1%80%D0%B5%D1%89%D0%B5%D0%BD%D0%BA%D0%BE%20%D0%9D.%20%D0%90.%20%D0%B8%20%D0%B4%D1%80..pdf |
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| Summary: | The diagnostics of overhead power lines is an important issue
in the modern electric power industry. Sometimes supporting
insulators are destroyed by external factors. Cracks in insulators
can cause the destruction of the insulator, which increases the
electrical injuries of personnel. Therefore, the article investigates
the diagnosis of insulators by the method of partial discharges
as a tool for personnel protection. The electric field of normal
and defective insulators is simulated. Partial discharges (PD)
experiments are conducted in the same insulators. The results of
modeling the electric field show a high electric field intensity in
a porcelain insulator with a slit and in an epoxy insulator with a
crack. In these cases, the electric field in the air gap is higher than
the electric strength of the air. In other cases, the electric field
is not exceed the electric strength of the material. Experimental
studies have shown the highest intensity of partial discharges in
cases of high electric field strength obtained in the simulation.
However, other defective insulators also show the presence
of partial discharges. The only case of the absence of partial
discharges is a porcelain insulator without a defect. An analysis of
experimental data shows that the diagnosis of partial discharges
can be effective for insulators only if a voltage higher than the
working voltage is used. In the experiments, only voltages of 16
kV and higher made it possible to reliably detect the presence
of a defect. Therefore, this method cannot be recommended for
the diagnosis of supporting insulators before the disconnector is
used by personnel, which could reduce the electrical injuries of
personnel. In addition, monitoring of partial discharges also will
not be effective for the studied types of defects. |
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| ISSN: | 1813-8225 2541-7541 |