DC high-current metering device
A metering device and large current technology, applied in measuring devices, measuring electrical variables, measuring current/voltage, etc., can solve the problems of difficult current tracking and complex structure of current metering devices, achieve automatic tracking and improve the level of automated testing , cost and weight reduction effects
Inactive Publication Date: 2009-11-04
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
[0003] The invention provides a DC large current metering device, which solves the problems of complex structure and difficult current tracking of the existing current metering device, and is used for standard metering of DC large current with a simple and stable operation structure
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[0020] The present invention will be further described below in conjunction with the accompanying drawings.
[0021] Such as figure 1 As shown, the sensor head of the present invention has an annular shape, and its cross section is as follows figure 2 As shown, the first annular detection iron core C with the same shape is made by winding with permalloy strip and annealing 1 and the second annular detection core C 2 , the first annular detection core C 1 and the second annular detection core C 2 The first modulation detection winding W with the same number of turns is respectively wound on D1 , the second modulation detection winding W D2 , after assembly in the first modulation detection winding W D1 and a second modulation sense winding W D2 Copper foil is wrapped on the outside, as an electrostatic shielding layer E, and then they are placed in a permalloy magnetic shielding iron core C with an annular cavity structure 3 in the cavity of the magnetically shielded i...
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The invention provides a DC high-current metering device, belonging to the current measurement equipment in electrotechology, and the invention can solve the problems of complicated structure of the current metering device and difficult current tracking. In the device, a sensing head comprises a first annular detecting core and a second annular detecting core, wherein the first annular detecting core and the second annular detecting core are wound with a first modulation detecting winding and a second modulation detecting winding, which are arranged in a magnetic shading core; a feedback winding and a bias winding are wound outside the magnetic shading core; the first modulation detecting winding and the second modulation detecting winding are connected with a modulating oscillator, and are connected with a demodulator, an amplifier, the feedback winding and a standard resistor; a primary current sensor and a secondary current sensor are connected with a differential amplifier, a filter, a power amplifier, the bias winding and a capacitor. The DC high-current metering device features simple structure, low cost and light weight, realizing full automatic tracking and balancing of the secondary bias current, and improving the automatic testing level; and regarding metering of 60,000 amperes DC high current, the proportional precision of the device reaches over a hundred thousandth.
Description
technical field [0001] The invention belongs to current measuring equipment in electrical technology, in particular to a metering device for direct current large current. Background technique [0002] "A Self-Balancing Direct Current Comparator for 20,000Amperes" IEEE Transactions On Magnetics.VOL.MAG-1 published in Volume 1, Issue 4, December 1965 of IEEE Transactions on Magnetics , NO.4, December 1965), is the largest standard metering device for DC high current in the world so far. It is a DC current proportional device with an accuracy of one hundred thousandth. Its two-core magnetic modulator acts as an ampere-turn balance detector to output a detection signal. After the demodulator and amplifier, a feedback current is generated and flows through the feedback winding. , to achieve the balance of feedback ampere-turns and measured DC current ampere-turns, and determine the current ratio between the secondary feedback small current and the primary measured large current....
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IPC IPC(8): G01R19/00
Inventor 任士焱
Owner HUAZHONG UNIV OF SCI & TECH