Zero-sequence current transformer and manufacturing method thereof

Abstract

The invention discloses a zero-sequence current transformer in the technical field of transformers. The zero-sequence current transformer comprises an outer sheath, and an inner sheath is fixedly connected with the interior of the outer sheath; a magnetic core is sleeved with the inner sheath, and the magnetic core is located between the inner sheath and the outer sheath; a copper wire is wound on the magnetic core in a same-direction reversion mode, and pins are connected with the two ends of the copper wire; a gum layer for sealing the magnetic core is arranged between the inner sheath and the outer sheath. A manufacturing method comprises the following steps that firstly, the magnetic core is prepared; secondly, winding is conducted, wherein the copper wire is wound on the magnetic core in the same-direction reversion mode; thirdly, assembling is performed, wherein the inner sheath is fixedly connected with the interior of the outer sheath; then the magnetic core where the wire is wound is connected to the inner sheath in a sleeving mode, and then the two ends of the copper wire are connected with the pins; finally, the gap between the inner sheath and the outer sheath is fully filled with resin for sealing. According to the scheme, the copper wire is wound on the magnetic core in the same-direction reversion mode, so that the invalid internal resistance caused by an initiating terminal line of the zero-sequence current transformer is counteracted, and then the output characteristic of the zero-sequence current transformer is smoother.

Description

technical field [0001] The invention belongs to the technical field of transformers, in particular to a zero-sequence current transformer and a preparation method thereof. Background technique [0002] The zero-sequence current transformer is a single-turn feedthrough current transformer, which is generally used in power protection equipment such as: small current grounding line selection device, computer harmonic elimination device, etc. [0003] At present, zero-sequence current transformers generally include outer sheath, inner sheath, copper wire, pins, magnetic core and resin; when connecting, the inner sheath is fixedly connected in the outer sheath, and the copper wire is wound in the same direction Connected to the magnetic core, the two ends of the copper wire are connected to the pins; then the magnetic core wound with the copper wire is sleeved on the inner sheath, and then poured and sealed with resin. The magnetic core adopts the winding method of forward rotat...

AI Technical Summary

Problems solved by technology

[0004] The present invention intends to provide a zero-sequence current transformer and its preparation method to solve the problem that the zero-sequence current transformer in the prior art has poor output characteristics due to the winding method of forward rotation in the same direction.

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