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Switching devices for on-load tap changers

A tap changer, switching device technology, applied in electrical switches, electrical components, circuits, etc., can solve problems involving overheating and the like

Active Publication Date: 2017-09-12
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the heat loss in the transition resistance is small due to the short duration of the switching action, frequent switching will probably still involve a risk of overheating

Method used

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  • Switching devices for on-load tap changers
  • Switching devices for on-load tap changers
  • Switching devices for on-load tap changers

Examples

Experimental program
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Embodiment Construction

[0029] There are many switching device designs which are arranged to provide an electrical connection between at least one movable contact of a tap changer and an external output and by means of which smooth switching between different taps of the tap changer is possible. Here, the term switching device is used to refer to the ability to pass a load current I from one tap to another in a tap changer under continuous operation of the tap changer (i.e. without any interruption in power transmission). load s installation. In one type of tap changer, called the diverter type, the tap changer includes a switching device called a diverter switch, and a tap selector. The switches of the diverter switch can be operated in sequence to switch operation between two taps (see Figure 5 with 7 ). In a diverter switch tap changer, a tap selector is used to select the tap to which the load current is passed, and a diverter switch is used to perform the commutation of the load current from...

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PUM

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Abstract

A switching device (115, 300) for an on-load tap changer (100) is disclosed. The switching device is designed for providing electrical connection between a fixed contact (135) and an external output (155) of the tap changer. The switching device provides: a main current path comprising a main switch (140) which is series-connected in the main current path; and a transition current path comprising a transition inductor (400) and a transition switch (145). The transition switch and the transition inductor are connected in series. The impedance of the transition current path is higher than the impedance of the main current path, the impedance of the transition current path being mainly inductive. The main switch and the transition inductor are connected in parallel, so that upon opening of the main switch, a load current flowing through the main current path will be commutated to the transition current path.

Description

technical field [0001] The invention relates to the field of power transmission, and in particular to tap changers for controlling the output voltage of a transformer. Background technique [0002] A tap changer is used to control the output voltage of a transformer by providing the possibility to switch on or off additional turns in the transformer winding. The tap changer comprises a set of fixed contacts which can be connected to a number of taps of the regulating winding of the transformer, wherein the taps are positioned at different points in the regulating winding. The tap changer further comprises at least one movable contact connected at one end to the current collector and at the other end connectable to one of the fixed contacts. By switching different taps on or off, the effective number of transformer turns can be increased or decreased, thereby regulating the output voltage of the transformer. [0003] Mechanical tap changers are typically arranged such that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H9/00H01H9/54
CPCH01H9/0005H01H9/0038H01H9/54
Inventor T.拉斯森
Owner HITACHI ENERGY SWITZERLAND AG