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Hybrid on-load tap-changer change-over switch

An on-load tap and switch switching technology, applied in the field of electrical equipment and electrical engineering, can solve the problems of low switch reliability, replacement of insulating oil, etc., to reduce the number of oil filtering and oil changes, increase service life, and reduce losses Effect

Inactive Publication Date: 2015-01-14
潘小山
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the shortcomings of the existing on-load tap-changer such as arcing, frequent replacement of insulating oil, and low switch reliability during the switching process of the existing on-load tap-changer, the present invention provides a hybrid on-load tap-changer switching The changeover switch is installed in the hybrid on-load tap-changer, one end is connected to the power inlet terminal, and the other end is connected to the tap selector of the hybrid on-load tap-changer, so that when switching and selecting the transformer tap no arc generation

Method used

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Embodiment Construction

[0023] The present invention is based on the consideration of the arc generated during the switching process of the mechanical on-load tap changer, fully utilizes the advantage of the conduction type of the power electronic device that does not generate an arc, and uses the power electronic device to assist the action of the mechanical contact to complete the arc-free switching.

[0024] The hybrid on-load tap changer switch is mainly composed of 1 left switching branch, 2 bridging branches, and 3 right switching branches. The structures of 1 left switching branch and 3 right switching branches are the same. 1. The left switching branch is composed of contacts A, B, C, thyristor switching branch and transition branch. The thyristor switching branch is composed of anti-parallel thyristors T11, T12, diodes D11, D12, current limiting resistors R11, R12, voltage transformer PT1, current limiting resistor R13, time relay KT1 (including coil KT1-1, contact KT1-2) , 2 bridges connect...

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Abstract

The invention discloses a hybrid on-load tap-changer change-over switch. The hybrid on-load tap-changer change-over switch mainly consists of a left change-over branch circuit 1, a bridge connection branch circuit 2 and a right change-over branch circuit 3, wherein the left change-over branch circuit 1 and the right change-over branch circuit 3 are respectively connected to a transformer winding 5 through a tap selector 4, the bridge connection branch circuit 2 enables the left change-over branch circuit and the right change-over branch circuit to be connected so as to assist change-over action of the on-load tap-changer change-over switch. The on-load tap-changer change-over switch can be installed in an on-load tap-changer to achieve non-arc voltage regulation during on-load voltage regulation of a transformer. The hybrid on-load tap-changer change-over switch has the advantages of being free of electric arcs in the change-over process, low in transition loss, accurate in change-over moment, low in manufacture cost, high in practicability and the like, and a good solution is provided for arcing freeing of on-load voltage regulation of the transformer.

Description

technical field [0001] The invention relates to the technical field of electrical equipment and electrical engineering, and more specifically relates to a changeover switch for a transformer on-load tap changer. Background technique [0002] With the development of the power industry, users have put forward higher requirements for power quality. Voltage stability is one of the main technical indicators to measure power quality, and voltage fluctuations directly affect industrial production and people's quality of life. Transformer on-load voltage regulation technology is an important means of stabilizing voltage, that is, in the case of uninterrupted power supply, the on-load tap changer switches the transformer from one tap to another to adjust the effective number of turns of the transformer winding to achieve regulation. pressure purpose. [0003] At present, more than 90% of domestic power transformers at all levels from 10kV to 500kV are equipped with on-load tap-chan...

Claims

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Application Information

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IPC IPC(8): H03K17/687
Inventor 朱宁辉杨少辉
Owner 潘小山
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