Method for manufacturing a magnetic core expansion cover for a medium-voltage transformer and magnetic core expansion cover for a medium-voltage transformer

Abstract

The subject of the application is a method for manufacturing an expansion sleeve for the magnetic core of a medium voltage transformer, and an expansion sleeve for the magnetic core of a medium voltage transformer for use in the production of special transformers such as voltage transformers and current transformers, which counteracts adverse changes in the core's magnetic properties caused by mechanical stress. The purpose of the application is to develop a method for manufacturing an expansion sleeve for a transformer's magnetic core, according to which the resulting expansion sleeve will be in the form of a self-contained shell, with an internal shape that replicates the shape of the magnetic core for which it is intended.According to the method, a model of the intended magnetic core is placed in the mold, and the expansion joint cover and the model are removed from the mold through the demoulding part. The expansion joint cover and the model are then separated from the demoulding part, and the expansion joint cover is removed from the model. The expansion joint cover (1) has a C-shaped profile with a hollow cross-section. One of the parts (3') of the peripheral wall (4) of the expansion joint cover (1), which is located on the outer side of the expansion joint cover (1) or on its inner side, is longitudinally open through a slot or cutout (6).