Direct-current resistant current transformer
A technology of current transformer and transformer, applied in the direction of inductor, transformer/inductor core, transformer/inductor coil/winding/connection, etc., to ensure the effect of accurate measurement
Active Publication Date: 2017-08-18
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology
[0006] The invention provides an anti-DC current transformer to solve the problem that the electric energy meter can perform accurate measurement when the DC content is high or the half-wave DC is large
Method used
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[0039] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.
[0040] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...
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The invention discloses a direct-current resistant current transformer. The transformer comprises an anti-saturation iron core, a primary winding, a secondary winding and a compensating winding, wherein an air gap is formed in the anti-saturation iron core; the primary winding is used for connecting a measured circuit; the secondary winding is used for connecting a measuring instrument; the secondary winding, the compensating winding and the primary winding are wound on the anti-saturation iron core in sequence; the phase error of the transformer is compensated through the compensating winding; and the ratio error of the transformer is compensated by adjusting the number of windings of the secondary winding. Through the technical scheme provided by the invention, the phase error is compensated by setting the compensating winding, so that the transformer can guarantee accurate metering for electric energy when the content of primary direct current is hundreds of amperes and the secondary current is standard current of 5A and 1A.
Description
technical field [0001] The invention relates to the field of transformer measurement, in particular to an anti-DC current transformer. Background technique [0002] In the power system, the power current transformer is usually used to convert the primary large current into a standard small current of 5A or 1A, and together with the electric energy meter, it constitutes the current measurement circuit of the electric energy metering device. Therefore, the performance of the current transformer is directly related to the electric energy metering. The accuracy will affect the fairness and justice of electricity trade settlement. When the system is in normal steady state operation, the primary current of the current transformer is generally a power frequency sine wave. If the transformation ratio of the current transformer and the rated secondary load are selected properly, its operating error can reach the desired goal. However, in some special cases, the primary current of th...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H01F38/30H01F27/24H01F27/28G01R19/165G01R15/18
CPCG01R15/183G01R19/165H01F27/24H01F27/28H01F38/30H01F2038/305
Inventor 杜蜀薇杜新纲雷民葛得辉彭楚宁熊魁周峰岳长喜殷小东姜春阳
Owner CHINA ELECTRIC POWER RES INST