Rogowski coils for measuring small currents

Abstract

The invention discloses a Rogowski coil for measuring small current, comprising an insulating rubber tube outer layer, a shielding layer, an enameled wire, magnetic material, a feedback core wire anda central flexible framework which are concentrically arranged from outside to inside. The two ends of the enameled wire and the feedback core wire are connected to the butt joint of the Rogowski coil. A lead shielding wire is connected to the butt joint of the Rogowski coil. The lead shielding wire is composed of an inner core wire and a shielding material layer wrapped outside the core wire. Plurality pairs of lead joints matched with the lead shielding wire are provided on the enameled wire. According to the Rogowski coil for measuring small current, plurality pairs of lead joints are provided on the enameled wire, so that the purpose of adjusting the number of the turns is achieved only by loosening the joints of the Rogowski coil and pulling the central flexible framework to connect the other lead joints to the end of the lead shielding wire when the number of the turns needs to be adjusted.

Description

technical field [0001] The invention relates to a Rogowski coil for measuring small current. Background technique [0002] In order to be installed in any irregular conductor without affecting the measurement, the current Rogowski coil has very good flexibility, because its skeleton adopts a flexible skeleton; Changes in pressure will change the shape and structure of the wound coil, which in turn changes the structural parameters and electrical parameters of the Rogowski coil, thereby affecting the accurate measurement of current parameters. The second is that when winding the coil on the flexible skeleton, it is easy to cause the deformation of the skeleton, the broken wire of the winding coil and the difficulty of precise control of the winding uniformity and other manufacturing process problems; the Rogowski coils on the market are all used to measure the power frequency and large current. , using the principle of Rogowski coil air-core without magnetic field saturation...

AI Technical Summary

Problems solved by technology

[0002] In order to be installed in any irregular conductor without affecting the measurement, the current Rogowski coil has very good flexibility, because its skeleton adopts a flexible skeleton; Changes in pressure will change the shape and structure of the wound coil, which in turn changes the structural parameters and electrical parameters of the Rogowski coil, thus affecting the accurate measurement of current parameters

The second is that when winding the coil on the flexible skeleton, it is easy to cause the deformation of the skeleton, the broken wire of the winding coil and the difficulty of precise control of the winding uniformity and other manufacturing process problems; the Rogowski coils on the market are all used to measure the power frequency and large current. , using the principle of Rogowski coil air-core without magnetic field saturation, theoretically can measure a very large current, and the flexibility of the Rogowski coil is also very good, it can be installed in any irregular conductor without affecting the measurement; but with the application of the market It is more and more widely used and has more and more uses. Many users also need to measure small currents in different occasions. The current Rogowski coils are at a loss when measuring small currents, especially small currents below a few amperes.

An air gap is also added to the magnetic circuit, which can also increase the reluctance and avoid magnetic saturation. The air gap of the current Rogowski coil cannot be adjusted to adapt to the measurement of different currents.

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