Abstract
The need of solving the problem concerned with measuring the polymerization degree (molecular weight) of polymeric dielectric systems is stemming from its practical significance, which implies the availability of a reliable polymerization degree measurement method that would fully meet the power equipment maintenance requirements. The problem is rather intricate in nature, and the requirements are quite stringent. In 2017, the Public Council of Specialists for Diagnostics of Power Electrical Equipment at the Engineering Technical Center (ETC) of UralEnergoEngineering commenced studies of existing and newly developed methods for estimating the polymerization degree of insulating papers that form the insulating structure of power electrical equipment. These studies were carried out with participation of scientific groups, which used different approaches to solving the stated problem. The article presents the results from discussion of polymerization degree measurement methods differing from each other in nature (chemical, optical and electrical), which were outlined in the reports presented at the Interregional Scientific and Practical Workshop held in the Smolensk Branch of the National Research University Moscow Power Engineering Institute (NRU MPEI) on April 26, 2018. It is emphasized (ETC of UralEnergoEngineering, Associate Professor V.N. Osotov) that the chemical method recommended by the relevant regulatory documents does not allow to get a full idea about the paper insulation ageing degree. Indirect methods (analysis of gases dissolved in oil, content of furans in it, etc.) do not yield a quantitative assessment of the ageing degree of the operating insulation system. Alternative methods of nondestructive testing and devices for estimating the polymerization degree of insulating papers: the spectral one (developed by Professor V.K. Kozlov from the Kazan Power Engineering University) and the method of dielectric absorption currents (developed by Professor V.A. Chernyshev from the Smolensk Branch of the NRU MPEI) meet the power equipment maintenance requirements to a fuller extent.
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