Rogowski coil for measuring small current and manufacturing method thereof

Abstract

The invention discloses a Rogowski coil for measuring small current, which comprises an outer layer of an insulating rubber tube, a shielding layer, an enameled wire, a magnetic material, a feedback core wire, and a central flexible frame disposed concentrically from the outside to the inside. The outer layer of the insulating rubber tube, the shielding layer, the enameled wire, the magnetic material, the feedback core wire, and the two ends of the central flexible frame are connected on the joints of the Rogowski coil. The joints of the Rogowski coil are connected to a lead-out shield wire, which is composed of an inner core wire and a shielding material layer wrapped around the core wire. The present invention also provides a method of manufacturing such a Rogowski coil. The present invention avoids manufacturing process problems, such as the deformation of the frame, the wire breaking of the winding coil, and the difficult to accurately control the winding uniformity when winding the coil on the flexible frame, by the arrangement of an annular tubular central flexible frame with the injection of a hot melt fluid.

Description

technical field [0001] The invention relates to a Rogowski coil for measuring small current and a manufacturing method thereof. 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-cor...

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.

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