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Step switch

A technology of tap changer and switch unit, applied in the field of tap changer

Inactive Publication Date: 2012-11-07
MASCHFAB REINHAUSEN GEBR SCHEUBECK GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this arrangement requires prior special adaptation of the tap-changer to the corresponding step-change transformer to be switched on

Method used

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Embodiment Construction

[0017] figure 1 A tap changer according to the invention is shown. Shown here are two load branches A and B, which can each be connected via mechanical contacts to two coil taps of a step-variable transformer. Each load branch A or B has a mechanical main contact MCa or MCb which, in steady state operation, carries the current of the respectively connected load branch and establishes a direct connection to the load lead LA. Each load branch A or B has a series connection parallel to the corresponding main contact MCa, MCb consisting of further mechanical contacts TCa, TCb and the corresponding semiconductor switching unit SCSa, SCSb. On the side remote from the respective switching contact TCa, TCb, the semiconductor switching units SCSa, SCSb are electrically connected to each other and lead to the mechanical transition contact TC, which is connected on the other side to the load lead LA.

[0018] During the switching process, which will be described in more detail below, i...

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Abstract

The invention relates to a step switch comprising semiconductor switches for uninterrupted switching between tap windings of a step transformer. The switch is a hybrid switch that has fixed mechanical contact fingers and counter-contacts situated on a movable contact carrier. Semiconductor switch units are provided for the actual load switching, said units being actuated in a predetermined switching sequence by the contacts on the contact carrier.

Description

technical field [0001] The invention relates to a tap changer with semiconductor switching elements for switching without interruption between taps of a step-adjustable transformer coil. Background technique [0002] WO 01 / 22447 discloses a tap changer configured as a hybrid switch with semiconductor switching elements. This known tap changer has a mechanical part and an electrical part as a hybrid switch. The mechanical part, which is the actual subject of WO 01 / 22447, has mechanical switching contacts; the central part is a movable sliding contact, which is moved by a motor along a contact rail connected to the star point and simultaneously contacts a fixed contact element. The actual load lead itself is realized by two IGBTs each having four diodes forming a Glitz circuit. The disclosed hybrid switch concept is mechanically demanding in order to ensure that the required load switching is exactly at the zero crossing of the load current. [0003] WO 97 / 05536 discloses a...

Claims

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Application Information

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IPC IPC(8): H01H9/00
CPCH01H9/0027H01H9/541G05F1/20H01F29/04H01H9/00H03K17/687
Inventor O·布吕克尔U·赫特尔A·希尔特哈默A·萨韦列夫
Owner MASCHFAB REINHAUSEN GEBR SCHEUBECK GMBH & CO KG
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