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Tap changer

By designing multiple groups of parallel-connected tap switching mechanisms in the tap changer and adjusting the conductor connection points, the problem of contact overheating when no load is solved, more efficient current distribution is achieved, eddy current losses are reduced, and the efficiency is improved Equipment stability and efficiency.

Inactive Publication Date: 2014-08-13
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There may be localized overheating at the contact part of the tap changer due to the eddy current generated in the tap changer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0032] figure 1 It is a cross-sectional view showing the structure of the tap changer in Embodiment 1 of the present invention. figure 2 From figure 1 See the diagram of the tap changer mechanism of the tap changer of this embodiment in the direction of arrow II. The tap changer 10 of the present embodiment is a tap changer that switches the taps of the connected transformer when there is no load. in figure 2 In the figure, the insulating cylinder 12 is described in perspective.

[0033] Such as figure 1 , 2 As shown, the tap changer 10 of the first embodiment of the present invention includes a rotating shaft 11 made of an electrically insulating material, and an insulating cylinder arranged coaxially with the rotating shaft 11 and made of an electrically insulating material 12. The rotating shaft 11 is connected to a driving source not shown. Can rotate around the center of the shaft. The diameter of the insulating cylinder 12 is about 50 cm to 100 cm, for example.

[0034]...

Embodiment approach 2

[0148] Figure 13 It is a cross-sectional view showing the structure of a tap changer according to Embodiment 2 of the present invention. Such as Figure 13 As shown, a tap changer 20 according to Embodiment 2 of the present invention includes a rotating shaft 21 made of an electrically insulating material, and an insulating cylinder arranged coaxially with the rotating shaft 21 and made of an electrically insulating material twenty two. The rotating shaft 21 is connected to a driving source not shown, and can rotate around the center of the shaft. The diameter of the insulating cylinder 22 is about 50 cm to 100 cm, for example.

[0149] The tap changer 20 of the present embodiment is provided with a three-component tap switching mechanism group. The above-mentioned tap switching mechanism group arranges four tap switching mechanism parts 200 at predetermined intervals in the axial direction 1 of the rotating shaft 21, and Electrically connected in parallel.

[0150] Specificall...

Embodiment approach 3

[0188] Figure 14 It is a cross-sectional view schematically showing the structure of the tap changer of the fourth comparative example. Figure 15 With Figure 14 Similarly, a cross-sectional view schematically showing the structure of a tap changer according to a modification of the first embodiment of the present invention. Figure 16 With Figure 14 Similarly, a cross-sectional view schematically showing the structure of the tap changer in Embodiment 1 of the present invention. Figure 17 With Figure 14 Similarly, a cross-sectional view schematically showing the structure of a tap changer according to Embodiment 3 of the present invention.

[0189] First, the tap changer of the fourth comparative example will be described. Such as Figure 14 As shown, the tap changer of the fourth comparative example includes one tap changing mechanism group including the first to sixth tap changing mechanism parts 501 to 506.

[0190] The tap switching mechanism group includes an input conduct...

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PUM

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Abstract

The invention provides a tap changer 10 which according to the present embodiment has the above-described configuration. Particularly, input connection point 118a and output connection point 119a are located closer in shaft direction 1 of rotation shaft 11 to center line 3 of entire two tap changing mechanism groups than center line 2a of one-end side tap changing mechanism group 100a. Furthermore, input connection point 118b and output connection point 119b are located closer in shaft direction 1 of rotation shaft 11 to center line 3 of entire two tap changing mechanism groups than center line 2b of the other-end side tap changing mechanism group 100b.

Description

Technical field [0001] The present invention relates to a tap changer, in particular to a tap changer that switches the tap of a connected transformer when there is no load. Background technique [0002] As a prior document, there is Japanese Patent Application Laid-Open No. 2007-258393, which discloses a time tap changer that reduces the eddy current loss generated in the lead penetrating portion of the drive mechanism and reduces the current limit due to the eddy current loss. [0003] In the load time tap changer described in Japanese Patent Application Laid-Open No. 2007-258393, the connection lead between the switch switch and the tap selector is composed of odd-numbered side and even-numbered side connection leads. [0004] The odd-numbered side connecting lead is drawn upward from the odd-numbered side ring contact and connected to the odd-numbered side terminal of the switching switch. The upper lead is drawn out from the odd-numbered side ring contact and connected to the sw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H1/56H01F29/02
CPCH01H19/02H01F29/04H01H1/56H01H1/62H01H9/0016
Owner MITSUBISHI ELECTRIC CORP