A current measuring device and method
A current measuring device and current technology, applied in the field of power equipment, can solve the problems of preventing OCT from being practical, it is difficult to meet the accuracy of transformers, and it is difficult to achieve the measurement effect, and achieves easy machining and low coil winding process requirements. Effect
Active Publication Date: 2016-09-14
韦兆碧
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Problems solved by technology
Optical current transformers have the advantages of anti-high electromagnetic noise interference, large dynamic range, fast response, high sensor current sensitivity, compact structure, small size, light weight, cheap price, and non-contact measurement of the measuring device, but the measurement method of OCT is open. Therefore, it is difficult to achieve the ideal measurement effect, and the temperature drift problem caused by linear birefringence hinders the practical application of OCT
[0005] The Rogowski coil is an air-core coil that is evenly wound on a small and uniform annular non-magnetic skeleton. Compared with the traditional electromagnetic induction CT, Rogowski basically solves the problem of magnetic saturation and improves the dynamic response range of the traditional CT. However, it is still difficult to meet the accuracy of the transformer. The high-voltage sensing head must be active and cannot be converted into a DC component. The non-ideality of the coil structure, the influence of temperature and electromagnetic interference cannot be ignored. These four key issues
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[0033] Such as figure 1 As shown, a current measuring device includes: a magnetic core 1, an auxiliary coil 3, the magnetic core 1 is a fixed opening concentrating core, the opening concentrating core is box-shaped or circular; the auxiliary coil 3 is wound around the concentrating core On 1, the output wire end 5 of the auxiliary coil 3 is electrically connected to the load 2, and the load 2 is electrically connected to the voltage measuring circuit, and the voltage measuring circuit detects the current passing through the bus 4 under test.
[0034] The voltage measurement circuit uses a single-chip microcomputer with A / D input, and the A / D input has a band-pass filter circuit. The signal of the measured bus 4 is band-pass filtered by the band-pass filter, and only the frequency of the measured bus current is allowed to pass. Perform A / D conversion to read digital signals.
[0035] During measurement, the bus bar 4 under test passes through the middle of the box-shaped or ring-sha...
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The invention relates to a current measurement device and a method. The device comprises a magnet core and an auxiliary coil and is characterized in that the magnet core is a concentrating magnet core with a fixed opening, the auxiliary coil is wound on the concentrating magnet core, and an output wire end of the auxiliary coil is connected with a load. During measurement, a measured bus penetrates through the middle of the concentrating magnet core, current changes of the measured bus are inducted by the auxiliary coil wound on the concentrating magnet core, and passing currents are calculated and obtained by detecting voltages at two ends of the load. According to the current measurement device and the method, the measuring sensitivity is affected by little electromagnetic interference, and the manufacturability is good.
Description
Technical field [0001] The invention belongs to the field of power equipment, and relates to a current measurement device and method, which can be applied to a high-voltage and large-current power measurement system. technical background [0002] In the power measurement system, the methods of measuring current include current transformer, optical current transformer and Rogowski coil method. [0003] The function of a current transformer (CT for short) is to convert a primary current with a larger value into a secondary current with a smaller value through a certain transformation ratio, and the current can be measured by an electronic measurement circuit. The current transformer is composed of a closed iron core and windings based on the principle of electromagnetic induction. The secondary side is absolutely not allowed to be open. Once open, the primary current I1 will all become the magnetizing current, causing a sudden increase in φm and E2, resulting in excessive saturation ...
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IPC IPC(8): G01R19/25
Inventor 韦兆碧
Owner 韦兆碧