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Journal of Nanomaterials
Volume 2014, Article ID 510864, 6 pages
Research Article

A Novel Nanomodified Cellulose Insulation Paper for Power Transformer

1State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Shapingba District, Chongqing 400044, China
2School of Materials Science and Engineering, Chongqing University, Shapingba District, Chongqing 400044, China

Received 6 February 2014; Accepted 10 March 2014; Published 31 March 2014

Academic Editor: Fan Dong

Copyright © 2014 Yuan Yuan and Ruijin Liao. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A novel cellulose insulation paper handsheet has successfully been modified with various contents of montmorillonite (MMT). Relative permittivity and breakdown strength were investigated. The microstructure of MMT in Kraft paper was observed with scanning electron microscopy (SEM) and X-ray diffraction. The relative permittivity of the immersed oil Kraft-MMT handsheets (K-MMT) initially decreased with the increasing amount of MMT. For MMT concentration of 9 wt%, K-9% MMT possessed the lowest relative permittivity of approximately 2.3 at 50 Hz. The breakdown voltage of the paper-oil-paper composite insulation system increased from 50.3 kV to 56.9 kV. The tensile strength of the paper handsheet was also measured.