Abstract:
Today, mineral insulated and cooled power transformers are world wide most frequently used. The transformer oil is used by on-load tap changers not just as a medium of insulation, but also as a breaking medium during tap changing. A complex kinetic system of switches concluding one tap change sequence within about 50 ms guarantees the successful current commutation during switching from one tap to another-the necessary know how is one of the very key-competences of a manufacturer of on-load tap-changers (OLTCs). The desire to reduce considerably frequency and extent maintenance or to enable the utilization of alternative insulation, makes new switching technologies necessary. The solution with the greatest advantages-from the today’s point of view-seems to be the application of vacuum interrupters as switching elements. The hermetically sealed system of the vacuum-switching elements prevents any interactions with its environment. As a result, no fission or the decomposition products which are primarily responsible for required maintenance can arise within the insulating liquid.
Page(s):
85-91
DOI:
DOI not available
Published:
Journal: New Horizons: Journal of the Institution of Electrical & Electronics Engineers Pakistan, Volume: 42, Issue: 1, Year: 2003