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Shielding and isolating voltage mutual inductor

A voltage transformer, isolation technology, applied in the direction of inductors, transformers, transformer/inductor coils/windings/connections, etc., can solve the problems of single function, unfavorable promotion and application, complex technical means, etc., and achieve reasonable insulation structure. Effect

Active Publication Date: 2012-05-23
STATE GRID ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of this utility model are: the voltage transformer needs to install a shielding cover separately on the periphery of the transformer, and the technical means adopted are complicated, which is not conducive to popularization and application
The disadvantages of this invention are: the voltage transformer is a fully shielded voltage transformer with single function and complex technical means, which is not conducive to popularization and application

Method used

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  • Shielding and isolating voltage mutual inductor
  • Shielding and isolating voltage mutual inductor
  • Shielding and isolating voltage mutual inductor

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Embodiment Construction

[0012] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0013] figure 1 Instructions marked in: Tm-booster with center tap; T1-common voltage transformer with rated voltage U; T2-voltage transformer with rated voltage U / 2; T3-common voltage with rated voltage U / 2 Transformer; HE-transformer calibrator.

[0014] figure 2 Instructions marked in middle: 1-low voltage end of primary winding; 2-high voltage end of primary winding; 3-secondary winding terminal; 4-shield terminal; 5-shielded cable; 6-polyester film insulation layer; ; 8-secondary winding; 9-silicon steel sheet iron core; 10-primary winding; 11-shell;

[0015] A shielded and isolated voltage transformer provided by an embodiment of the present invention includes an iron core, a primary winding, a shielding layer, an isolation layer, and a secondary winding, and adopts an R-type silicon steel sheet iron core, SF6 gas or oil-type insulat...

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Abstract

The invention provides a shielding and isolating voltage mutual inductor. The shielding and isolating voltage mutual inductor comprises an iron core, a primary winding, a shielding layer, an isolating layer and a secondary winding, and has an R-type silicon steel plate iron core, SF6 gas or oil insulating structure, wherein the iron core and a shell are in a U / 2 potential; copper foil layers coated inside and outside the secondary winding serve as static shielding; the secondary winding and the copper foil layers are insulated with the primary winding by a polyester film, and the insulating level depends on the insulating level of a primary winding of another voltage mutual inductor which is added in series with the secondary winding; and the secondary winding and the shielding are led out of the shell through a sleeve. The shielding and isolating voltage mutual inductor can realize respective serial with the first winding and the second winding of another conventional semi-insulatingvoltage mutual inductor, can ensure that the error characteristics of the voltage mutual inductor per se is constant before and after serial addition, and has the advantages of compact structure, perfect function and high accuracy.

Description

technical field [0001] The invention relates to an isolated voltage transformer, in particular to an isolated voltage transformer with high requirements on accuracy and insulation between primary and secondary windings, and belongs to the technical field of instrument voltage transformers. Background technique [0002] In my country's power frequency voltage proportional value system, it is necessary to use voltage transformers with the same transformation ratio in series to realize the addition of primary and secondary voltages, so as to complete the process of transferring the low voltage level value to the high voltage level value. This requires that the two voltage transformers connected in series can not only realize the voltage addition of the primary and secondary windings, but also ensure that the respective error characteristics of the two before and after the series connection process remain unchanged. In order to achieve this goal, one of the transformers must hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F38/24H01F27/36H01F27/28G01R15/18
Inventor 周峰雷民殷小东项琼胡宗泉
Owner STATE GRID ELECTRIC POWER RES INST
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