CN2862281Y

CN2862281Y - New-type transformer low tension coil

Info

Publication number: CN2862281Y
Application number: CN 200520092141
Authority: CN
Inventors: 赵良云; 张伟; 张冬梅
Original assignee: TECHNOLOGY CENTRE SHENYANG TRANSFORMER GROUP CO Ltd TEBIAN DIANGONG
Current assignee: TBEA Shenyang Transformer Group Co Ltd
Priority date: 2005-08-12
Filing date: 2005-08-12
Publication date: 2007-01-24
Anticipated expiration: 2015-08-12

Abstract

The utility model discloses a novel low-voltage winding for transformer, which includes low-voltage winding, a-terminal, x-terminal and layer insulation. The low-voltage winding is a group of conductor wires parallel-connected and arrayed in axial direction, one end of each conductor wire is respectively in vertical electrical connection with the a-terminal; number of turns of the winding is equal to that of the conductor wire; another end of each conductor wire is respectively in vertical electrical connection with the x-terminal. The low-voltage winding has simple manufacture, and doesn't need transposition during winding process despite of multiple parallel-connected conductor wires. If axial oil duct is provided inside the winding, the oil duct can be formed by long stay or corrugated cardboard, so as to greatly improve winding efficiency of the low-voltage winding. The winding has flat end, small reactance coefficient, and multiple strands of insulated conductor wires at winding end, therefore, eddy current loss induced by stray magnetic field is small, and performance parameters can be conveniently guaranteed and designed, thereby being a novel and unique low-voltage winding for transformer.

Description

A kind of novel transformer low-voltage coil

Technical field

The utility model relates to a kind of transformer coil, more particularly relates to a kind of novel transformer low-voltage coil, belongs to the improvement of distribution transformer low-voltage coil.

Background technology

At present, the low-voltage coil of big capacity distribution transformer generally adopts double helix, four spirals or paper tinsel formula structure, and four helical coils are equivalent to two double-spiral structures.Double helix or four helical coils, along axial two or four lead parallel connections of coil, radial have a multiple conducting wires parallel connection.The residing stray field of parallel conducting wire is inequality, must replace between the parallel conducting wire, and the number of times of transposition is relevant with the number of turn with the radical of parallel conducting wire; Because the temperature limit requirement of coil, coil surfaces externally and internally heat radiation sometimes can not meet the demands, and portion increases radiating surface in coil, and promptly portion is provided with the axial oil duct of certain width and quantity in coil, guarantees the heat-sinking capability of coil.For double-stranded coil, in the coil transposition,, often to cancel the axial oil duct cushion block of transposition in order not increase the radial size of line cake, more axial oil duct cushion block is added after the transposition.Axially oil duct cushion block volume is little, and quantity is many, so the coiling efficient of coil is low; Because coil is a helical structure, overhang has certain gradient, causes the horizontal stray field of end winding bigger, and axial electric power was big when transformer was short-circuited, in order to guarantee the safe and reliable of transformer operation, must adopt high-intensity end circle to compress coil to end winding; The end out-of-flatness, the transverse electric Chinese People's Anti-Japanese Military and Political College of transformer, promptly the reactance coefficient of transformer is big.The conductor material of foil coil is a Copper Foil, and its width is the height of coil, and thickness is generally the 0.5mm-1.5mm. foil coil does not need transposition when coiling, and its axial oil duct directly forms with long stay, the coiling efficient height of whole winding; The foil coil end is smooth, and reactance coefficient is smaller.With regard to foil coil, the horizontal stray field in transformer end will produce big eddy current loss in Copper Foil, and the coiling of corresponding paper tinsel formula coil winding machine ability must be arranged; The different capabilities transformer, the thickness of the Copper Foil that it needs is different with width, of a great variety, the Breadth Maximum of Copper Foil is 1m, so the height of coil is restricted, and it is serious to overstock copper foil material for a long time, excessive inventory for fund, because the price of Copper Foil is high more a lot of than the price of lead.

Summary of the invention

The purpose of this utility model provides a kind of novel transformer low-voltage coil, it does not only replace in coiling, the efficiency height, and coil inside is done the oil duct that axial oil duct replaces small cushion block with long stay, make to make and become convenient, simultaneously end winding is straight, and laterally little, eddy current loss of leakage field and short-circuit electromotive force are little.

The purpose of this utility model is achieved in that it includes low-voltage coil, a terminal, x terminal and layer insulation, it is characterized in that described low-voltage coil is one group of lead that axially is arranged in parallel, and an end of lead is vertical configuration with a terminal respectively and is electrically connected; Lead coiling one circle is a circle, and the number of turn of coil equals the coiling number of turns of lead; An other end of lead is vertical configuration with the x terminal respectively and is electrically connected.

The utility model has the advantages that, because low-voltage coil is the lead of one group of axially-aligned parallel connection, the inner end of lead is vertical configuration with a terminal respectively and is electrically connected, the outer end of spiral conducting line is vertical configuration with the x terminal respectively and is electrically connected, therefore low-voltage coil is made simple, although the multiple conducting wires parallel connection is arranged, coil does not need transposition in winding process; If coil inside has axial oil duct, oil duct can be formed by long stay or corrugated board, therefore increases substantially the coiling efficient of low-voltage coil; And end winding is concordant, and reactance coefficient is little, again because overhang is a split conductor, so the eddy current loss that stray field causes is little, can guarantee the design performance parameter easily, is a kind of novelty and the low voltage winding in transformers product that shows unique characteristics.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is that structure master of the present utility model looks schematic diagram.

Fig. 2 is that the M-M of Fig. 1 is to analysing and observe organigram.

Fig. 3 is the plan structure figure of Fig. 1.

Fig. 4 is second embodiment.

Fig. 5 is the 3rd embodiment.

Embodiment

In Fig. 1-3, flat cable copper conductor 6 six roots of sensation axially-aligned that low-voltage coil 3 usefulness have paper covered wire 7 turn to coil, and each paper bag lead 6 of the inner end of coil is the vertical configuration welding with a terminal made from copper bar 1 respectively.The outer end of lead 6 is the vertical configuration welding with x terminal 5 respectively.Make the six conductors 6 of axially-aligned be electrically connected the formation parallel-connection structure by a terminal 5 and the coil x terminal made from copper bar conductor 1.Interlayer at low-voltage coil 3 has layer insulation 8, and upper end insulation 2 is arranged on the top of low-voltage coil 3, also has lower end insulation 4 in the bottom of low-voltage coil 3.

In Fig. 4-5, in one group of lead 6 of low-voltage coil 3, except that two of the two ends up and down of coil or three radicle lead are the paper bag lead, one group of lead that axially is arranged in parallel 6 of low-voltage coil 3 or be plain conductor 9.In low-voltage coil 3 or the axial oil duct 10 that is divided into of useful long stay or corrugated paper.

Claims

1, a kind of novel low voltage winding in transformers, it includes low-voltage coil, a terminal, x terminal and layer insulation, it is characterized in that described low-voltage coil is one group of lead that axially is arranged in parallel, and an end of lead is vertical configuration with a terminal respectively and is electrically connected; Lead coiling one circle is a circle, and the number of turn of coil equals the coiling number of turns of lead; An other end of lead is vertical configuration with the x terminal respectively and is electrically connected.

2, a kind of novel low voltage winding in transformers according to claim 1 is characterized in that described one group of lead that axially is arranged in parallel is the paper bag lead, or plain conductor.

3, a kind of novel low voltage winding in transformers according to claim 1 and 2 is characterized in that the axial oil duct that interior useful long stay of described low-voltage coil or corrugated paper are divided into.