Epoxy pouring type current transformer and manufacturing method thereof

Abstract

The invention provides an epoxy pouring type current transformer which comprises an epoxy resin body (1), a primary winding (2) and a secondary winding (3), the lower edge of the primary winding (2) is sleeved with an insulating round tube (4), the lower edge and the insulating round tube (4) concentrically penetrate through a center hole of the secondary winding (3), the insulating round tube (4) is wrapped with a semi-conductive layer, and the semi-conductive layer is wrapped with an insulating layer. And the bottom of the epoxy resin main body (1) is connected with a mounting bottom plate (7). The device is simple in structure, convenient to operate and capable of improving the partial discharge level of a product. The invention further provides a manufacturing method of the epoxy pouring type current transformer. The manufacturing method comprises the following steps of iron core buffering and binding, secondary winding (3) winding, primary winding (2) winding, primary terminal (5) welding and pouring. The process steps are simple, the working efficiency is high and the cost is low.

Description

technical field [0001] The invention relates to the field of current transformers, in particular to an epoxy casting type current transformer and a manufacturing method thereof. Background technique [0002] Epoxy casting current transformer is composed of primary winding and secondary winding, which are then cast with epoxy resin mixture. The prior art has the following problems: 1. After the winding of the primary and secondary windings is completed, first wrap the buffer layer on the primary and secondary windings, and then wrap the semi-conductive layer for overall shielding to ensure the partial discharge level, and the operation It is complicated, and the shape of the primary conductor is a square structure. It is very time-consuming to wrap the buffer layer. After the buffer layer is wrapped, it is easy to form an irregular shape. When wrapping the semiconductive layer, it will also cause poor wrapping and easy detachment. Low work efficiency, low output, etc., and t...

AI Technical Summary

Problems solved by technology

The existing technology has the following problems: 1. After the winding of the primary and secondary windings is completed, the primary and secondary windings are respectively covered with a buffer layer first, and then covered with a semi-conductive layer for overall shielding to ensure the partial discharge level. It is complicated, and the shape of the primary conductor is a square mechanism. It is very time-consuming to wrap the buffer layer. After the buffer layer is wrapped, it is easy to form an irregular shape. Low work efficiency, low output, etc., and high production costs; 2. The primary winding must pass through the iron core. The existing production method is that the primary conductor directly passes through the center hole of the secondary winding, and the concentricity cannot meet the requirements after casting , which is not conducive to generating a uniform electric field

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