Patents Publication number EP0147125 B1 Publication type Grant Publication date Jul 27, 1988 Filing date Dec 10, 1984 Priority date Dec 8, 1983 Also pu blish ed as EP0147125A1 US4595806 Inventors Katsuaki C/O Itami Works OfMitsubishi Itoh Appl ican t Mitsubishi Denki Kabushiki Kaisha International Classification H01H9/00 4 More » Eu ropean Classi fi cati on H01H 9/00B External Links Espacenet EP RegisterCLAIMS 1. An on-load tap changer comprising a selector switch (24) and a change-overswitch (90), each having a plurality of contacts divided into groups according to phase, and an intermittent drive mechanism (60), characterised in that the contact rou s of the chan e-over switch 90 are arran ed in the EP 0147125 B1 DESCRIPTION Background of the invention This invention relates to an on-load tap changer for use with an electric apparatus such as a transformer, and more particularly to a compact on-load ta chan er called a selector switch t e comrisin a selector Find pri or art Discuss this patent DRAWINGS (2) [0001] French Sign in +You Search Images Maps Play YouTube News Gmail Drive Calendar Mor e Ver esta página em: português Google Traduto rDesativar para: inglês Opções ▼ Patent EP0147125B1 - On-load tap changer - Google Patents http://www.google.com/patents/EP0147125B1?cl=e 1 de 6 18/03/2013 18:36
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Patent EP0147125B1 - On-Load Tap Changer - Google Patents
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7/30/2019 Patent EP0147125B1 - On-Load Tap Changer - Google Patents
If the sprocket wheel 66 and the Geneva wheel 74 were disposed within one of the phases other than the above
Phase III, one half of the voltage across the transformer winding would appear across the gap distance X, and
therefore a greater insulating distance able to withstand the above voltage would be required. However, on the
present invention, since the sprocket wheel 68 and the Geneva wheel 74 are disposed within Phase III in which the
voltages of the above- mentioned components are given, an entire voltage between the tap windings, which is
significantly smaller than the one half voltage of the voltage between the transformer winding turns, is applied
across the above gap distance X, and within the other two phases, about one half of the above voltage between
the transformer winding turns is applied across the gas distance Y which is longer than the above gap distance X,
providing significant advantages in the design of the insulation.
Therefore, as is taught by the present invention, when the arrangement is made such that the phases of the
change-over switch are separated in the circumferential direction and the electrical potential of a partition plate
within the insulating housing and the electrical potential of an intermittent drive unit of the change-over switch are
equal to the electrical potential of the collector contact which is the lowermost phase of the selector switch and a
portion of the intermittent drive unit that project .most toward the selector switch is disposed within the phase of
the change-over switch which corresponds to the lowermost phase of the selector switch, the axial length of the
change-over switch and of the tap changer as a whole can be reduced. According to the on-load tap changer of the present invention, as described above, not only is the potential
distribution suitable to the insulating distance permitted, allowing a reasonable insulating design, but also the axial
lengths of the change-over switch as well as the entire on-load tap changer can be shortened, contributing to a
compact design of a transformer resulting in a significant cost reduction.
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