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Tap changer contact system

A tap changer and contact system technology, applied in contact meshing, electrical components, electrical switches, etc., can solve problems such as material burn-through, and achieve the effect of simplifying structure and minimizing mechanical wear

Active Publication Date: 2018-09-07
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this has nothing to do with the wear problem and does not solve the problem, since the electrical contact starts at the very front edge of the circular contact surface on the fixed contact head and thus produces a burn-through of the material

Method used

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  • Tap changer contact system
  • Tap changer contact system
  • Tap changer contact system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0052] exist figure 1 In , the fixed contact part 1 and the movable contact part 2 are shown. The fixed contact portion 1 is one of a plurality of similar fixed contact portions arranged in the tap changer. The movable contact part 2 is arranged in contact with one of the fixed contact parts in the tap changer. By moving the movable contact part 2 from one fixed contact to the other, the point of connection to the transformer provided with the tap changer is changed and thus the transformation ratio of the transformer is changed. Apart from the inventive features related to the contact system, the general arrangement of the fixed and movable contacts in the tap changer and the operating steps performed at tap change may be of conventional type. Therefore, an explanation of the general construction and general operation of a tap changer is considered redundant.

[0053] The change of the connection point includes that the movable contact part 2 first leaves the first fixed c...

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PUM

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Abstract

The invention relates to a contact system for a tap changer. The system includes a fixed contact part (1) having a first contact surface (4), and a movable contact part (2) having a second contact surface. The movable contact part (1) is movable from an electrical non-contact position to an electrical contact position and vice versa. The direction of movement is substantially parallel to the first contact surface (4). Force applying means (F) is arranged to urge said contact surfaces towards each other. According to the invention one of said contact parts includes a wheel means (3) arranged to roll against an abutment surface (6,) of the other contact part during an entering phase of the movement from the electrical non-contact position to the electrical contact position. The rolling contact is a sole and singular contact between the contact parts (1, 2,) during the entering phase

Description

technical field [0001] The invention relates to a contact system for a tap changer comprising a fixed contact with a first contact surface and a movable contact with a second contact surface, the movable contact part being movable from a non-contact position to a contact position, and vice versa, the direction of movement is substantially parallel to the first contact surface, and thus the force applying means are arranged to push the contacts towards each other. [0002] The invention also relates to tap changers and transformers. Background technique [0003] Tap changers are often used in conjunction with transformers in order to change their transformation ratio. In a transformer with a tap changer, one of the windings in the transformer has a fixed number of turns connected to the circuit. The other winding has a fixed connection point, and the other connection point can be selected among a certain number of fixed contacts to obtain the required voltage. The optional...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H9/00H01H1/16
CPCH01H9/0016H01H1/16
Inventor J·马塔伊
Owner HITACHI ENERGY SWITZERLAND AG