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Flux-confined zero-sequence current transformer

A zero-sequence current and transformer technology, which is applied in the direction of inductors, transformer/inductor cores, transformer/inductor coils/windings/connections, etc., can solve the problems of large transformers and difficult to apply

Inactive Publication Date: 2018-08-14
STATE GRID CORP OF CHINA +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the transformer has a large volume and is difficult to apply to various complex situations

Method used

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  • Flux-confined zero-sequence current transformer

Examples

Experimental program
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Effect test

Embodiment 1

[0012] An embodiment of the present invention, its structure is as figure 1 shown.

[0013] Such as figure 1 As shown, the flux-constrained zero-sequence current transformer of this embodiment consists of a square-shaped iron core as the zero-sequence current transformer body, and four-way coupling windings are installed on the iron core, and the transformation ratio of the four-way coupling windings is M : M: M: N, the four coupling windings are wound on the iron core in the same direction. The three-way windings are respectively connected to the secondary windings of the three-phase auxiliary current transformer as three-phase coupling windings, and the fourth winding is connected to the zero-sequence current detection device as a zero-sequence current winding. The primary windings of the three-phase auxiliary current transformers are respectively connected in series with the tested lines, and the secondary windings are connected with the three-phase coupling windings of t...

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Abstract

The invention discloses a flux-confined zero-sequence current transformer, and belongs to the technical field of electrical engineering. The invention comprises a zero-sequence converter body connected via a three-phase auxiliary current transformer, the body adopts a conventional toroidal core or a lip core; the zero-sequence converter body adopts a four-winding structure, wherein three windingsand an auxiliary current transformer are mutually connected, the remaining winding is connected to a zero-sequence current detecting device; the primary winding of the three-phase auxiliary current transformer is connected to the circuit under test, and the secondary winding is connected to the three-phase winding of the zero-sequence converter body. The invention can be free from the problem of the volume increase caused by the conventional zero-sequence current transformer due to the inclusion of the three-phase line, and the three-phase zero-sequence current can be measured under various working conditions.

Description

technical field [0001] The invention belongs to the technical field of electric engineering, in particular to a flux-constrained zero-sequence current transformer. Background technique [0002] With the rapid development of the power system, the voltage level and transmission capacity of the power grid are increasing, and the measurement of the zero-sequence current of the power grid is faced with many constraints such as insulation, volume, and capacity. At present, there is an urgent need for a zero-sequence Current Transformer. [0003] Chinese patent application 201520314178.3 discloses a three-phase integrated zero-sequence current transformer, including A-phase, B-phase, C-phase current transformers and zero-sequence current transformers, and the A-phase, B-phase and C-phase current transformers are arranged side by side Setting, the zero-sequence current transformer is set on the A-phase, B-phase and C-phase current transformers, and cast into an integral structure w...

Claims

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Application Information

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IPC IPC(8): H01F38/38H01F27/24H01F27/28G01R15/18
CPCG01R15/183H01F27/24H01F27/28H01F38/38
Inventor 吴维宁朱金大武迪骆健吕宏水俞拙非侯凯孙厚涛陈璐瑶隗华荣李继红周华张静张旗
Owner STATE GRID CORP OF CHINA