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Direct current metering device

A technology of DC current and measuring device, applied in measuring device, measuring electrical variable, measuring current/voltage, etc., can solve the problems of insufficient industrial measuring accuracy and stability of current sensing device

Inactive Publication Date: 2015-05-06
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a DC current metering device, which solves the problem of insufficient accuracy and stability of the existing current sensing device for industrial metering, and is used for standard metering in the field of strong DC industry with a reliable and stable operation structure

Method used

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] Embodiments of the present invention include a sensor head, an excitation transformer T 1 , Modulating transformer T 2 , low-pass filter E, phase-sensitive demodulator F, synthesis regulator G and power amplifier H;

[0024] Such as figure 1 , figure 2 As shown, the sensing head is circular and includes a first annular detection core C 1 , the second annular detection core C 2 and annular magnetic shielding core C, the first annular detection core C 1 and the second annular detection core C 2 The same shape, the first annular detection core C 1 The outside is wound with the first modulation detection winding W D1 ’, the first modulation detection winding W D1 'The outside is wound with the first excitation detection winding W D1 ;Second annular detection core C 2 The outside is wound with a second modulation detection winding W D2 ’,...

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Abstract

A direct current metering device belongs to current metering equipment in the electrotechnology, solves the problems of insufficient precision and stability of the existing current sensing device used for industrial gauging, and is used for the standard gauging in the strong direct current industrial field with the reliable and stably operated structure. The direct current metering device comprises a sensing head, an exciting transformer, a modulation transformer, a low pass filter, a phase sensitive demodulator, a synthesis modulator and a power amplifier; the sensing head is annular and comprises a first annular detection iron core, a second annular detection iron core and an annular magnetic shield iron core; the first and second annular detection iron cores, respectively wound by two sets of detection windings, are overlapped to be wholly placed in the annular hollow cavity of the annular magnetic shield iron core; and a feedback winding surrounds the annular magnetic shield iron core. The direct current metering device can realize the accurate gauging of the industrial strong direct current with ten thousands of amperes, realizes full automation traction in the whole process without unbalance, and is high in stability and reliability and suitable for industrial application, and the proportion precision achieves more than 0.02%.

Description

technical field [0001] The invention belongs to current metering equipment in electrotechnical technology, in particular to a metering device for direct current. Background technique [0002] "A Self-Balancing Direct Current Comparator for 20,000Amperes", IEEE Transactions on Magnetics.Vol.MAG- 1, NO.4, December, 1965.), is the world's first DC large current metering device based on the principle of magnetic modulation, and its accuracy reaches one hundred thousandth. Its two-core magnetic modulator is used as the output signal of the ampere-turn balance detector. After the demodulator and amplifier, the feedback current is generated and flows through the feedback winding to realize the balance between the feedback ampere-turn and the measured DC current ampere-turn, and determine the secondary feedback. The current ratio between the small current and the large current measured at one time. This device has the following principle defect: the DC input / output characteristics...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
Inventor 任士焱
Owner HUAZHONG UNIV OF SCI & TECH
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