Electric Energy T&D Magazine Doble Conference 2005

8 - Manitoba Hydro Dynamic Protection Testing

By By: Ding Lin, Protection Engineering, Research Centre, Manitoba Hydro & Randy Wachal, Manitoba HVDC

A large set of fault cases was developed for the dynamic transient testing of line protection for a new 230 kV transmission line recently commissioned by Manitoba Hydro.
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27 - Assessing Health and Criticality of Substation Transformers

By By: David J. Woodcock, Weidmann Systems International

Utilities in North America installed a large number of transformers from the early 1960’s to the end of the 70’s. As a result of diminished capital spending since that time, many transformers are approaching the end of their technical life and most have reached the end of their financial life. Driven to reach an increasingly higher level of reliable electrical service, the trade-off for diminished capital investment is to spend more on equipment maintenance.
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31 - Transformer cooling – The impact of oil viscosity on the performance

By By: Dipl.Ing. Gerfrid Newesely, technical consultant for Nynas

The cooling behaviour of oil filled transformer is influenced by several factors including the type and volume of insulating oil, the surface and design of the radiators, the availability of oil pumps or air fans, the loading mode, etc.
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