Accurate metering current transformer and manufacturing method of double-magnetic-circuit current transformer
A current transformer, accurate measurement technology, applied in the direction of inductors, circuits, transformers/inductor coils/windings/connections, etc., can solve the problem that the installation space is difficult to meet the installation of two transformers, multiple transformers are easy to affect each other, and it is difficult to To achieve the predetermined effect and other problems, to achieve the effect of improving self-checking ability, saving installation space and saving energy
Pending Publication Date: 2021-12-10
山东亿玛信诺电气有限公司
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Problems solved by technology
Taking the 0.2S standard as an example, there is no requirement for the accuracy level of the current below 1% of the rated current, which results in poor measurement accuracy of large current transformers for small currents and no controllability
Some manufacturers improve the accuracy of current transformers by setting multiple current transformers and adding complex switching circuits, but in some cases the installation space is difficult to meet the installation of two transformers, and at the same time, multiple transformers are easy to affect each other, Difficult to achieve the intended effect
Method used
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[0029] The application will be further described below in conjunction with the accompanying drawings and embodiments.
[0030] It should be noted that the terminology used herein is only for describing specific embodiments, and is not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.
[0031] In this disclosure, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom" etc. refer to The orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only a relative term determined for the convenience of describing the...
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The invention provides a double-magnetic-circuit accurate metering current transformer, which comprises a large transformation ratio current transformer and a small transformation ratio current transformer which are arranged on the same line and have independent magnetic circuits, and a transformer switching circuit, wherein the next stage of the small transformation ratio current transformer is connected with a multiplying power unified transformer in parallel, the multiplying power unified transformeris used for being matched with the small transformation ratio current transformer to form a current transformation ratio which is the same as that of the large transformation ratio current transformer, the number of turns of the primary wire of the large transformation ratio current transformer is smaller than that of the primary wire of the small transformation ratio current transformer, and the transformer switching circuit switches the large transformation ratio current transformer and the small transformation ratio current transformer according to the actual current of the line. According to the invention, through intelligent switching of the two current transformers with independent magnetic circuits, accurate detection of small current is satisfied.
Description
technical field [0001] The present application relates to the technical field of electric power metering, in particular to a method for manufacturing a precise metering current transformer and a dual magnetic circuit current transformer. Background technique [0002] The statements in this section merely provide background technical information relevant to this application and do not necessarily constitute prior art. [0003] A current transformer is an instrument that converts a large current on the primary side into a small current on the secondary side for measurement based on the principle of electromagnetic induction. A current transformer consists of a closed core and windings. Its primary side winding has few turns and is connected in series with the current line to be measured. [0004] At present, the existing current transformers follow the national standard accuracy levels of 0.1, 0.2, 0.5, etc., and the current transformers for special purposes also have 0.2S a...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G01R15/18G01R19/25H01F38/28H01F27/28
CPCG01R15/18G01R19/25H01F38/28H01F27/28
Inventor 王丕杰刘玉兴王开瑞杨伟英高斌傅杰
Owner 山东亿玛信诺电气有限公司