Assessment of the Condition of the Insulating System of Power Equipment by the Method of Recording Polarization Currents
DOI:
https://doi.org/10.24160/1993-6982-2025-4-11-21Keywords:
condition diagnostic methods, power equipment, predicted service life, DAC spectrum, humidity level, diagnostic reliabilityAbstract
Increased attention to the development and studying of modern methods for diagnosing power equipment is still relevant and follows from The development and implementation of effective methods for diagnosing the technical condition of equipment is an important aspect in various industries where highly loaded power plants equipped with oil-filled transformers, cables, and other units are used. In the operating conditions of such devices, timely detection of defects that may lead to breakdowns and emergency situations is particularly crucial, as these can result in significant economic costs and safety risks. Non-destructive testing (NDT) is one of the most important approaches for diagnosing the condition of such objects, allowing assessment without disassembly, thereby preserving their integrity and operational characteristics.
One of the promising NDT methods is the use of dielectric absorption current (DAC) measurement techniques, also known as polarization current recording (PCR) methods, which provide information about the condition of an object, including the presence of defects such as contamination, oil leakage, degradation of insulating materials, and others. Polarization/depolarization currents represent a physical process that occurs due to the interaction of an electric field with a dielectric medium in power installations. This method allows monitoring changes in insulating materials, which can serve as an indicator of their aging, as well as the type and nature of developing defects.
The article presents the results of a study on the condition of the insulation system of three transformers with paper-oil insulation, obtained using an experimental prototype of the "DielectricAnalyzer" device based on the polarization current recording method, as well as a comparison with the results obtained using IDAX and Mit 525 (Megger) devices.
The interpretation of the data obtained using the polarization current recording method demonstrates not only the correctness of determining the main diagnostic parameters (correlation with other methods) but also highlights the method's sensitivity to the type of developing defect. This allows for the formation of a parameter characterizing the state of the insulation system and a more accurate determination of the predicted service life of the object under study.
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Для цитирования: Чернышев В.А., Зинченко К.А., Лопатин В.В., Утепов А.Е., Осотов В.Н. Оценка состояния изоляционной системы энергетического оборудования методом регистрации токов поляризации // Вестник МЭИ. 2025. № 4. С. 11—21. DOI: 10.24160/1993-6982-2025-4-11-21
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Конфликт интересов: авторы заявляют об отсутствии конфликта интересов
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For citation: Chernyshev V.A., Zinchenko K.A., Lopatin V.V., Utepov A.E., Osotov V.N. Assessment of the Condition of the Insulating System of Power Equipment by the Method of Recording Polarization Currents. Bulletin of MPEI. 2025;4:11—21. (in Russian). DOI: 10.24160/1993-6982-2025-4-11-21
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Conflict of interests: the authors declare no conflict of interest
