Winding method of a high voltage coil

Abstract

The invention discloses a high-voltage coil winding method. A cross-type winding structure is used to wind the high-voltage coil, and the coil is divided into two ends by an air channel plate for winding. There are only two welding points on the bottom layer, which are wound to the coil side by side. After the airway plate in the center is wound to both sides with a cable-stayed wire structure, after the bottom layer winding is completed, the layer is raised, and the cable-stayed wire structure is continued to be wound; this winding method reduces solder joints and ensures product reliability .

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a winding method of a high-voltage coil. Background technique [0002] In recent years, my country's power demand has grown rapidly. According to the global power transformer research report, it is estimated that by 2019, the global power transformer market will increase to 28.69 billion US dollars, with a compound annual growth rate of 7.7% during the period; high-speed power grid construction and investment have driven The market demand for power transmission and transformation equipment; the huge investment in power construction has brought opportunities and challenges to the transformer industry, which has promoted the rapid development of the transformer industry. [0003] The transformer consists of an iron core (or magnetic core) and a coil. The coil has two or more windings. The winding connected to the power supply is called the primary coil, and the remaining windin...

AI Technical Summary

Problems solved by technology

[0004] The current transformer high-voltage coil adopts a traditional structure, that is, a structure in which the high-voltage coils are evenly arranged. When this structure is used in conventional 10kV products, due to the low voltage level, the two sets of high-voltage coils are divided into four sections. The structure winding can meet the performance requirements according to this, but for 35kV and above products, due to the high voltage, under the premise of ensuring partial discharge, each high-voltage coil must ensure that the number of segments is 8-10 or more. , and with the increase of capacity, the number of air channels increases, resulting in more welding points in the high-voltage coil, and at the same time, some positions are difficult to weld, and a welding point becomes a hidden danger if it is not handled properly; see figure 1 It is a conventional coil structure, and there are 14 welding points outside the tap. Among them, welding points 1 and 2 are difficult to weld, and the welding must be performed on the coil, but this will cause the welding to be easily dropped. The slag will cause the coil to be burned. At the same time, after the welding is completed, the coil at the weld is not tightly fitted, and it is very easy to loosen. It must be bandaged, otherwise it will easily cause the coil to fall off, and it will also cause the coil to burn during operation; In the coil of a transformer, the fewer welding points, the more reliable the product quality

Images