SU1676008A1 - Bar winding of high-voltage electric machine and method of its manufacture - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to methods for manufacturing rod stator windings of high-voltage generators with a large thickness of shell insulation. The purpose of the invention is to improve the winding method by increasing the slot filling ratio with an electrically conductive material and simplifying the manufacturing technology. The winding bars are formed and fastened from elementary conductors 1. Strip 2 of the forming electrically insulating material, for example, prepreg, is placed on the narrow edges of the slot part of the rod. The rod is pressed with the formation in the gaskets 2 longitudinal channels 3 on the outside. The material 4 layer is wound with a porosity greater than that of the main body insulation 5 of mica-containing tape. Isolation 5 is pressed in pressplans 6 to a predetermined thickness and subjected to vacuum-pressure impregnation and drying. 2 h. and 3 s. ad hoc, 1 or

Description

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The invention relates to electrical engineering, in particular, to the rod windings of high-voltage electric machines and methods for their manufacture, including vacuum-pressure impregnation of the rods with insulation applied to them.

The aim of the invention is to improve the quality of the winding by increasing the filling ratio of the rod section and the efficiency of impregnation,

On schematically shows the cross section of the winding rod, placed in the press strips.

The core of the winding is molded and clamped the OSR from the elementary conductors 1. On the narrow edges of the slot part of the rod there are gaskets 2 of electrically insulating material, on the outer side of which there are longitudinal channels 3 with a depth of 1.0-1.5 mm each. Channels 3 are designed to improve the quality of impregnation of the insulation of the rod with an electrical insulating compound. A layer of spirally applied glass cloth tape 4 is placed on top of a core of elementary conductors. The glass fiber in the tape may be semiconducting, such as copper-silver-containing, or non-conducting. A layer of glass mica tape is placed on top of the layer of glass cloth tape, forming insulation 5. The voids and pores in the rod and the insulation are filled with a hardened impregnating compound, preferably epoxy.

The winding is made as follows.

First of the elementary conductors

1 the winding rod is molded and secured. Then, gaskets 2 of the forming insulating material, for example, of glass-mica paper prepreg on the epoxy-binder, are applied onto the narrow edges of the slot part of the rod. After that, the rod is pressed to form in gaskets

2 from the prepreg of the longitudinal channels 3 on the outer side and spirally butt-wrap a layer A of a porous material — semiconducting copper-silver-containing glass cloth tape or electrical insulating glass cloth tape. On top of layer 4 is wound in 1/2 overlap 25 layers of non-impregnated glass-mica tape, forming a winding of 5 6.6 mm thick. Then, the insulation winding 5 is pressed by press strips 6 to a predetermined thickness of 6.0 mm, which corresponds to the pressing by 10%.

The pressed rod is subjected to vacuum drying and impregnated under vacuum and pressure with an epoxy compound at a temperature of 55 ± 5 ° C, and after impregnation

cure for 15 hours at a temperature of 130 ° C.

By performing the impregnation channels in the gaskets on the narrow faces of the rods of the proposed winding, the filling ratio of the rod section is increased in comparison with the known solution, and the efficiency of impregnation of insulating winding improves, which improves the quality (solidity) of the finished insulation. The use of spacer materials on the narrow faces of the cores of prepregs allows, in a single pressing operation, to obtain and fill irregularities on the surface of the rod and form longitudinal channels, i.e., improve the quality of the winding almost without increasing the labor intensity of its manufacture.

Claims (3)

1. The core winding of a high-voltage electric machine, containing a core of conductors on which layers of mica-containing tape are wound, and longitudinal channels for impregnating them with a compound, characterized in that, in order to improve the quality of the winding by increasing the filling ratio of a rod section, it is provided with gaskets, placed on narrow faces of a rod, and longitudinal channels are made on the outside of the gaskets. 2, Winding according to claim 1, characterized in that, in order to improve the quality by increasing the impregnation efficiency, it it is provided with a layer of a spirally laid tape of a material with a porosity greater than the porosity of the mica-containing tape located under the layers of the mica-containing tape. 3. A method of manufacturing a core winding of a high-voltage electric machine, according to which the core is molded, longitudinal channels are formed, the mica-containing tape is wound on the rod, pressurized to a predetermined thickness, impregnated with a compound and thermally treated, characterized in that the pads are made from the forming material and after they are laid t pressure test with education on them longitudinal channels.