Synergistic enhancement effect of moisture and aging on frequency dielectric response of oil-immersed cellulose insulati
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REVIEW PAPER
Synergistic enhancement effect of moisture and aging on frequency dielectric response of oil-immersed cellulose insulation and its degree of polymerization evaluation using dielectric modulus Jian Hao . Xize Dai . Jun Gao . Lijun Yang Ruijin Liao
. Zheng Jian . Yongyong Du .
Received: 8 July 2020 / Accepted: 8 October 2020 Ó Springer Nature B.V. 2020
Abstract Oil-immersed cellulose insulation is the heart of the power transformer, which will will gradually deteriorate in the operation process of transformer. Therefore, accurately evaluating the aging condition of the oil-immersed cellulose insulation is important for maintaining safe and stable operation of transformer. In this paper, the synergistic effect of moisture and aging on frequency dielectric spectroscopy (FDS) of oil-immersed cellulose insulation was analyzed in depth using the modified cole– cole model. A novel degree of polymerization (DP)
J. Hao (&) X. Dai L. Yang Z. Jian R. Liao State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing, China e-mail: [email protected] X. Dai e-mail: [email protected] L. Yang e-mail: [email protected]
evaluation method for oil-immersed cellulose insulation based on the dielectric modulus analysis and its curve translation method was proposed. Results show that the higher the moisture content and the lower the DP, the greater the frequency dielectric parameters, the smaller the a relaxation time, the greater the DC conductivity and hopping conductivity of the oilimmersed cellulose insulation. The novel DP evaluation method for oil-immersed cellulose insulation based on calculating the integral area of the imaginary part of dielectric modulus A(DP–mc%) and translating the A(DP–mc%) curve was proposed, which could simultaneously consider the synergistic effect of moisture and aging on FDS. The novel DP evaluation method for the oil-immersed cellulose insulation is suitable for moisture range is 0.5–5%, and the DP range is 250–1300. The verified effectiveness of the novel DP evaluation method presents that it is ideal for transformer aging condition assessment, which is superior to the existing evaluation methods.
Z. Jian e-mail: [email protected] R. Liao e-mail: [email protected] J. Gao Y. Du State Grid Chengdu Power Supply Company, Chengdu, China e-mail: [email protected] Y. Du e-mail: [email protected]
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Cellulose
Graphic abstract
Keywords Cellulose insulation Synergistic enhancement effect Moisture and aging Degree of polymerization evaluation
Introduction Oil-immersed cellulose insulation is an important insulation structure of oil-immersed power transformer (Mo et al. 2019; Tang et al. 2018; Saha and Purkait 2008). In the regular operation of oil-immersed power transformer, oil-immersed cellulose insulation system will gradually deteriorate under the action of various stresses such as thermal stress and electric stress, which will lead to its performance deg
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