A Publication of the Dielectrics & Electrical Insulation Society
F E A T U R E A R T I C L E S
D E P A R T M E N T S 3 Editorial
6 Nanodielectrics – How Much Do We Really Understand? Christopher Green and Alun Vaughan We have sought to introduce some of the salient features of nanocomposite research that relate to the development and application of useful dielectrics.
17 Insulation Failure Mechanisms of Power Generators Rudolf Brütsch, Makoto Tari, Klaus Froehlich, Tilman Weiers, and Ruben Vogelsang Aging is not dominated by electrical stress but rather by the combination of different stress factors, of which thermal and mechanical wear are the most important.
26 Asset-Management of Transformers Based on Condition Monitoring and Standard Diagnosis Xiang Zhang and Ernst Gockenbach The important aim of the standardization is to develop the multiple diagnostic models that combine results from the different tests and give an overall assessment of reliability and maintenance for transformers..
4 Letter to the Editor 5 From The Editors’ Desk John Densley and Louise Audrieth
47 EIC Volunteer Profile 48 DEIS News 50 D & EI Folks 52 News From Japan Y. Ohki
41 Interaction between Insulating Paper and Transformer Oil: Bacterial Content and Transport of Sulfur and Nitrogen Compounds Martina Levin The paper insulation may influence the condition of the insulation oil in transformers.
54 Industry News 55 Book Reviews John. J. Shea
59 Meetings Calendar Harry Orton
Cover Photo: Prof. Masoud Farzaneh, Charles Biddle Prize Awardee
July/August 2008 — Vol. 24, No.4
61 CMD 2008 Conference Report Professor Chengrong Li