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Rogowski current sensor

A current sensor, integrating resistance technology, applied in the direction of measuring current/voltage, instruments, measuring electrical variables, etc., to achieve the effect of improving reliability

Active Publication Date: 2011-04-13
XI AN JIAOTONG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But these current sensors can only better measure current signals in a single amplitude range
If the current amplitude varies greatly, it is difficult to make a complete measurement throughout the experiment

Method used

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Embodiment Construction

[0027] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0028] like figure 1 Shown is a schematic structural view of an embodiment of the Rogowski current sensor of the present invention. In this embodiment, the Rogowski current sensor includes a circular magnetic medium skeleton 1, on which a first coil 2-1 and a second coil 2-2 are wound independently, respectively, Wherein the first coil 2-1 has more winding turns than the second coil 2-2, the first integrating resistor 5-1 is connected in parallel at both ends of the enameled wire forming the first coil 2-1, and the second integrating resistor 5-1 is formed in parallel The two ends of the enameled wire of the coil 2-2 are connected in parallel with a second integrating resistor 5-2, and the resistance values ​​of the first integrating resistor 5-1 and the second integrating resistor 5-2 are respectively according to th...

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Abstract

The invention relates to a Rogowski current sensor, which comprises an outer shielding structure, an annular magnetic medium framework, and a first coil and a second coil independently wound on the annular magnetic medium framework respectively. The first coil has more number of turns than the second coil; the first coil and the second coil are respectively connected in parallel with a first integral resistor and a second integral resistor with corresponding resistance; the first integral resistor and the second integral resistor are provided with a corresponding signal-measuring output end respectively; and the second integral resistor is connected in parallel with a transient voltage suppression diode. In a coil structure, by winding different turns of coils on the annular magnetic medium framework, the sensor measures a current signal in a wider amplitude range; and due to the mode that the second integral resistor is connected in parallel with the transient voltage suppression (TVS) diode, the export voltage at two ends of the second integral resistor is limited when heavy current passes through the coil, and the reliability of the sensor is improved.

Description

technical field [0001] The invention relates to high voltage measurement technology, in particular to a Rogowski current sensor. Background technique [0002] The Rogowski coil is a hollow or toroidal coil with a magnetic core. Its working mechanism is the principle of electromagnetic induction. It can be directly placed on the conductor under test to measure the AC current passing through the conductor. The measuring range of the coil is from a few milliamps to hundreds of kiloamperes, which can meet different measurement requirements. The Rogowski coil has the advantages of wide applicable frequency, wide measurement amplitude, good linearity, easy calibration, and no electrical connection with the primary circuit. Therefore, it has extremely broad application prospects in many fields, such as power quality monitoring, rectifier monitoring, partial discharge monitoring, etc. [0003] In the prior art, measuring sensors based on Rogowski coils that independently measure l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R15/00
Inventor 张乔根刘石张璐张翠霞
Owner XI AN JIAOTONG UNIV
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