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Current transformer device for high-precision current-voltage conversion

A current transformer, current and voltage technology, applied in the direction of inductors, transformers/inductor coils/windings/connections, transformers, etc., can solve problems such as increased failure rate, large resistance loss, and poor control of temperature drift

Inactive Publication Date: 2016-08-10
STATE GRID CORP OF CHINA +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional resistance sampling current-voltage converter will not only produce a large resistance loss, but also the temperature drift is not easy to control, which will lead to a decrease in measurement accuracy, inaccurate measurement of current signals, and increase the failure rate

Method used

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  • Current transformer device for high-precision current-voltage conversion

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Embodiment Construction

[0015] The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0016] A current transformer device for high-precision conversion of current and voltage, including an iron core 1, a primary winding 2, and a secondary winding 5, such as figure 1 As shown, the primary winding 2 is a multi-tap structure, including at least a first tap 3 and a second tap 4, wherein the primary current corresponding to the first tap 3 is 1A, and the primary current corresponding to the second tap 4 is 5A. The secondary current corresponding to the output of the secondary winding 5 is 50mA (that is: the number of coil turns at the first tap 3: the number of coil turns at the second tap 4: the number of coil turns of the secondary win...

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Abstract

The invention discloses a current transformer device for high-precision current-voltage conversion. The current transformer device comprises a core, a primary winding and a secondary winding and is characterized in that the primary winding is of a multi-tap structure and at least comprises a first tap and a second tap, a primary current corresponding to the first tap is 1A, a primary current corresponding to the second tap is 5A, a secondary current corresponding to the output of the secondary winding is 50mA, a resistor R1 and a resistor R2 which are connected in series are arranged between the secondary winding and are identical, and a part between the R1 and the R2 is grounded. According to the device, a high current of 5A or 1A is converted into a 1.25V voltage signal, which facilitates digital signal processing, separately through a 0.005-level current transformer and the two resistors which have the characteristics of 0.005 high-precision and 1ppM ultralow temperature coefficient, so that compared with the traditional resistance sample current-voltage converter, the device has the advantages that a temperature drift phenomenon cannot occur, and the final conversion precision can reach a 0.01 level.

Description

technical field [0001] The invention relates to a current transformer device for high-precision conversion of current and voltage. Background technique [0002] With the continuous advancement of power grid construction, electronic transformers, DC transformers and other metering devices are used more and more. The accuracy of such metering devices is directly related to the fairness and justice of trade settlement, so it is necessary to make errors check. This type of metering device needs to convert the 5A or 1A current signal output by the traditional current transformer into a voltage signal during calibration, so that the measuring device can analyze and process it. Therefore, the calibration of this type of metering device requires the assistance of a current transformer for current-voltage conversion, and puts forward higher requirements for the accuracy of the replacement device, which must reach 0.01 level. [0003] The traditional resistance sampling current-to-v...

Claims

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Application Information

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IPC IPC(8): H01F38/30H01F27/28H01F27/40
CPCH01F38/30H01F27/2828H01F27/402
Inventor 包玉树孙和泰胡永建孙军陈江洪胡月
Owner STATE GRID CORP OF CHINA
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