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Cabezon, Busbar, Thanks for the input. I am at a very early stage of understanding tapchangers, and while mechanics is my bent, I am beginning to try to understand what I am up against in the tapchanger area. I can understand the main problems that are common to all electrical equipt, such as...

All, Anyone involved with maintaining tapchangers and associated control circuits in both US and other countries: I am looking for info on the scope of maintenance - what is done, how often, potential problems and their solutions. Any details on oil management (other than DGA) including...

A colleague advised that a simple pressure vessel, constructed without post weld heat treatment, in which ammonia was used was found with substantial weld cracking. Tests on the material prior to construction indicated the material was sound, and the vessel was constructed by a quality company...

The US tends to use reactors in their tap changer diverter configurations, whereas a large part of the rest of the world uses switched resistors. As a non-US electrician, what are the benefits and drawbacks of using reactors, and is this as a result of the common US practice to tap on the low...