Moisture Transfer Characteristics in Silicone Oil–Silicone Rubber Insulation System Considering Swelling Effect

Yuan, Hao; Li, Yuan; Zhou, Kai; Zhang, Hao

doi:10.1109/tdei.2023.3298756

Cited by 2 publications

(1 citation statement)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In a previous study [28], model characteristics were determined for water contents ranging from 1 wt.% to 4 wt.% while model characteristics were determined for a critical content of 5 wt.% in the papers [29][30][31][32]. Secondly, transformer insulation measurements should be carried out under conditions of thermodynamic equilibrium between the pressboard, insulation oil and water [5,33]. Under conditions of thermodynamic equilibrium between the moisture in the oil and the pressboard, the moisture content of the oil is several orders of magnitude lower than that of the pressboard.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Influence of Insulation Moisture during Long-Term Exploitation of Transformers on Their Reliability as Determined by Alternating Current Electrical Parameters

Zukowski,

Kierczynski,

Rogalski

et al. 2024

Energies

View full text Add to dashboard Cite

This paper presents the results of the study of the direct current (DC) and alternating current (AC) electrical properties of an electrical pressboard–bio-insulating oil–water composite in a wide range of water content and temperatures used in electric power transformers. These parameters allow the level of insulation reliability to be determined after many years of operation of power transformers. To analyse the experimental results, a model of the DC and AC conductivities of nanocomposites based on the quantum-mechanical phenomenon of electron tunnelling was used. It was found that in a low-frequency region, the conductivities of AC and DC and their activation energy are equal. The relaxation times of AC conductivity and permittivity are also equal. It was found that the dependence of the DC conductivity on the distance between water molecules is an exponential function. On the basis of the model of conductivity by electron tunnelling between potential wells, the average number of water molecules in a nanodroplet, located in a composite of electrical pressboard–bio-insulating oil–moisture was determined to be (126 ± 20). It was found that the measured dependencies of DC and AC conductivity, permeability and dielectric relaxation times are consistent with the results of computer simulations performed on the basis of the model. This study showed that the composite of pressboard impregnated with bio-oil spontaneously transforms through water absorption into a pressboard–bio-oil–water nanocomposite. These will serve as the basis for the application of actual conductivity and dielectric relaxation mechanisms to improve the accuracy of moisture estimation in the solid component of power transformer insulation carried out on the basis of measurements of DC and AC properties. This will improve the operational safety of the transformers, minimise the occurrence of transformer failure and the associated environmental pollution.

show abstract