patent ep0147125b1 - on-load tap changer - google patents

7/30/2019 Patent EP0147125B1 - On-Load Tap Changer - Google Patents

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Patents

Publication number EP0147125 B1

Publication type Grant

Publication date Jul 27, 1988

Filing date Dec 10, 1984

Priority date Dec 8, 1983

Also published as EP0147125A1

US4595806

Inventors Katsuaki C/O Itami Works Of

Mitsubishi Itoh

Applicant Mitsubishi Denki Kabushiki Kaisha

International Classification H01H9/00

4 More »

European Classification H01H 9/00B

External Links Espacenet

EP Register

CLAIMS

1. An on-load tap changer comprising a selector switch (24) and a change-over

switch (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 com risin a selector

Find pr ior ar t Discuss this patent

DRAWINGS (2)

[0001]

French

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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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patent ep0147125b1 - on-load tap changer - google patents

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