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Self-Calibrating System for Ratio Error of Miniature Current Transformer

A technology of current transformer and ratio error, which is applied in the field of electrical measurement, can solve problems such as inconsistency in error value and affect the implementation of standards, and achieve the effects of less operation steps, high efficiency of range expansion, and good value reproducibility

Inactive Publication Date: 2017-01-25
HUBEI TIANRUI ELECTRONICS
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of non-standard methods leads to inconsistencies in the magnitude of errors, which affects the implementation of standards

Method used

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  • Self-Calibrating System for Ratio Error of Miniature Current Transformer
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  • Self-Calibrating System for Ratio Error of Miniature Current Transformer

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Experimental program
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Effect test

Embodiment Construction

[0011] Below, combined with figure 1 to attach image 3 The present invention is further described.

[0012] figure 1 Among them, the miniature current comparator 3 is used as a reference current transformer, the current ratio is 5A / 0.5A, and the transformation ratio is 10 / 1; the induction shunt 2 has 10 sections in total, and the primary current taps are set to n-1 and n. Record εn as the shunt error of the nth stage, is the reference current transformer error, For the measured value, there are:

[0013]

[0014] After measuring 10 segments, add the errors of each segment:

[0015]

[0016] get:

[0017]

[0018] According to this, the induction shunt 2 setting ratio can be calculated as 10 / K The error εk and the error εs of the 5A / 0.5A range of the micro current comparator 3:

[0019]

[0020]

[0021] figure 2 Among them, the secondary output of the miniature current comparator 3 is connected to the first segment of the miniature induction shunt ...

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Abstract

A ratio error self calibration system for a miniature current transformer comprises a 10-segment single disc miniature sensing diverter, a 5A / 0.5A miniature current comparator, three multi-ratio miniature current comparators, a power supply current transformer, a test current source, an error measurement apparatus, a zeroing impedance casing and a galvanometer, wherein 5A / 0.5A to 0.001A ratio values are led out employing a reference current method self calibration line and a current comparator cascade single-disc induction diverter ratio expansion line. The ratio error self calibration system for a miniature current transformer is characterized in that the current ratio measuring ranges are divided into three segments as following: 5A / 0.5 A to 0.1A, 5A / 0.05A to 0.01A and 5A / 0.005A to 0.001A, which are covered respectively by three multi-ratio miniature current comparators. The advantages are provided as following: the number of self calibration operation steps is small, the measuring range expansion efficiency is high, and value reproducibility is good.

Description

technical field [0001] The invention relates to a current transformer, especially a miniature current transformer, and belongs to the technical field of electrical measurement. Background technique [0002] Miniature current transformer refers to the mechanical industry standard JB / T10665 "Miniature Current Transformer", defined by the primary current not exceeding 10A, the secondary current is 1mA ~ 100mA, and is used for electronic energy meters and other instruments. The error of the miniature current transformer is verified by the difference method in accordance with the national metrology verification regulation JJG313 "Current Transformer for Measurement". The difference method requires the use of standard current transformers or current comparators with the same current ratio. At present, there is no standard for the value of miniature current transformers in China. The voltage difference method is used to test the error of miniature current transformers. The seconda...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/02
CPCG01R35/02
Inventor 王乐仁金波何斌
Owner HUBEI TIANRUI ELECTRONICS