Measuring the Polymerization Degree of Polymer Materials Used in the High-Voltage Equipment Insulation System
DOI:
https://doi.org/10.24160/1993-6982-2019-3-54-61Keywords:
polymerization degree, spectrum of dielectric absorption currents, dielectric medium viscosity, state estimation, insulation system, lifetimeAbstract
The use of polymeric materials polymerization degree (PD) as a parameter from which the state of power equipment insulation system as a whole is estimated imparts much importance and significance to the PD measurement problem. The possibility of using the PD value as a parameter for estimating the state of power equipment items that have been in operation for a long time also attracts the attention of specialists. In this regard, practical methods for measuring the spectrum of dielectric absorption currents, which make it possible to monitor the polymeric material polarization degree, are of special interest. These methods are based on the theoretical concepts about the motion of a charged particle as a Stokes body in dielectric medium with specific viscosity ƞsp under the effect of a constantly applied electric field. To this end, the conductivity of a specially formed two-layer dielectric medium is monitored in the method being analyzed. One of these layers is a sample of the material being monitored, and the second one, which is in close contact with the first one, is a material the viscosity of which is known or can be easily measured using accessible methods, as in the case of a liquid dielectric. The proposed method for determining the PD of organic dielectric materials by measuring the spectrum of dielectric absorption currents is essentially a dielectric medium viscosity monitoring technique. It is exactly this parameter that governs the charged particle motion pattern in a dielectric and, hence, the characteristic features of the spectrum of dielectric absorption currents in the insulation gap being monitored. Owing to the clear physical principles laid down in the proposed method for estimating the polymerization degree, commercial availability of the equipment for its implementation, the availability of user-friendly software, and the simplicity of interpretation and analysis of the obtained results, the new method significantly extends the existing tools for assessing the insulation system state and determining the remained lifetime of operating power equipment.
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Для цитирования: Чернышев В.А., Зенова Е.В. Измерение степени полимеризации полимерных материалов изоляционной системы высоковольтного оборудования // Вестник МЭИ. 2019. № 3. С. 54—61. DOI: 10.24160/1993-6982-2019-3-54-61.
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For citation: Chernyshev V.A., Zenova E.V. Measuring the Polymerization Degree of Polymer Materials Used in the High-Voltage Equipment Insulation System. Bulletin of MPEI. 2019;3:54—61. (in Russian). DOI: 10.24160/1993-6982-2019-3-54-61.
