Medium-voltage outdoor open-close type current transformer

Abstract

A medium-voltage outdoor open-close type current transformer is disclosed. The current transformer comprises a winding, an upper iron yoke plastic frame and a lower half-frame-shaped iron core plastic shell; an upper iron yoke is correspondingly arranged in the upper iron yoke plastic frame; a half-frame-shaped iron core is correspondingly arranged in the lower half-frame-shaped iron core plastic shell; the upper iron yoke plastic frame is hinged with one side of the lower half-frame-shaped iron core plastic shell; the upper iron yoke plastic frame is connected with the other side of the lower half-frame-shaped iron core plastic shell through a rapid open-close connecting apparatus; an elastic sheet is integrally arranged at the bottom of an inner cavity in the upper iron yoke plastic frame; the elastic sheet supports the upper iron yoke of the half-frame-shaped iron core; and when the upper iron yoke plastic frame and the lower half-frame-shaped iron core plastic shell are buckled, the elastic sheet can enable the upper iron yoke and the iron core to be tightly fitted. The medium-voltage outdoor open-close type current transformer is good in insulation and dampproof performance, and extremely easy to install, detach and maintain; the tight fit of the iron core groups is ensured by the elastic sheet; the measurement precision is improved; and in addition, the current transformer is quite simple and convenient to install, capable of greatly reducing the installation time and improving efficiency and safety performance, and good in electricity-stealing-prevention performance.

Description

technical field [0001] The invention belongs to electrical devices, in particular to an open-close outdoor current transformer. Background technique [0002] The medium-voltage outdoor current transformer is usually made of epoxy resin, which has good insulation performance and moisture-proof performance, and the secondary line terminal is equipped with a plastic cover for lead sealing. In order to maintain high precision, the ring iron core is usually not open and closed, so when installing, the transformer must be placed on the busbar first, and then the busbar connection must be installed, otherwise, the transformer cannot be installed. At the same time, when the transformer needs to be replaced, the busbar must also be removed, and the busbar must be reinstalled after the transformer is replaced, resulting in a long time for replacement, and a large waste of materials, which is time-consuming and laborious. Therefore, the medium-voltage outdoor current transformer cast ...

AI Technical Summary

Problems solved by technology

This hoop connection method will affect product performance due to different tightening degrees and interface alignment; in addition, after multiple installations, the hoop screws will fail and the product cannot operate normally

Since the outdoor switchable medium-voltage outdoor current transformer must be sealed with epoxy resin, the production is difficult, the process is complicated, and the degree of environmental protection and recyclability is extremely poor.

The secondary terminals of outdoor switchable medium-voltage outdoor current transformers are connected by terminals, and an anti-theft cover is added, which is complicated to install and there is a risk of secondary short circuit

[0003] Because outdoor products require good sealing performance, the shell-type split-type medium-voltage outdoor current transformer has no protection at the interface, and the outdoor current transformer used for outdoor current transformers will easily rust due to water ingress, resulting in a decrease in product accuracy or even scrapping. Therefore, Shell split current transformers cannot be used outdoors

Even if it is used indoors, it is often rusted due to humidity; and after the two iron cores of the split current transformer are fastened, there is often a loose fit, which affects the measurement accuracy of the transformer. will not be used in medium voltage outdoor current transformers

In addition, the medium-voltage outdoor current transformer adopts a terminal lead-out structure, which has poor anti-theft performance

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