JPH02203508A - Transformer winding - Google Patents

Abstract

PURPOSE:To improve potential distribution as observed during application of an impulse voltage and to obtain a transformer winding having a simple and compact multilayer cylindrical structure by connecting, in a specified manner, the starting and terminal ends of a cylindrical winding layer consisting of insulated wire ring elements formed of a pair of insulated conductors. CONSTITUTION:A first cylindrical winding layer 1 consists of insulated wire ring elements 2, 3 formed by juxtaposing a pair of conductors axially in parallel with each other and winding them by a predetermined number of turns. A second cylindrical winding layer 4 also has similar arrangement. The starting end 2a of the element 2 is connected to an insulated wire ring element of the inner winding layer while the terminal end 2b of the element 2 is connected to the starting end 3a of the element 3. The terminal end 3b of the element 3 is connected to the starting end 5a of the insulated wire ring element 5 while the terminal end 5b of the element 5 is connected to the start end 6a of the element 6. The terminal end 6b of the element 6 is connected to a line terminal. According to such arrangement of winding, increased series capacitance can be provided between the adjacent wire ring elements in the winding layer and potential distribution as observed during application of an impulse voltage can be improved remarkably. Therefore, it is possible to obtain a transformer winding having a simple and compact multilayer cylindrical structure without using any shield.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (Industrial Field of Application) The present invention particularly relates to transformer windings which are improved multilayer cylindrical windings.

(Prior Art) A multilayer cylindrical winding of a conventional transformer is constructed by concentrically winding a low-voltage winding 8 and a high-voltage winding 9 outside an iron core 7, as shown in FIG. This high-voltage winding 9 has a multilayer cylindrical structure and is composed of winding layers 10, 11, 12, 13, and 14 wound in a cylindrical shape, and a line terminal U and a neutral point terminal N are connected to both ends of the winding. There is.

Each winding layer 10.11.12 of the high voltage winding 9. '13.14
Although the capacitance between I! When voltage is applied, the potential rise at the center of each winding layer is delayed, and the winding layer 10, 11, 12, 13
, 14 becomes non-uniform. In order to improve this non-uniform potential distribution within the high voltage winding, shields 15 are conventionally provided at both ends of the winding.

However, when using the shield 15, not only does the radial dimension increase, but it also requires a structure that does not form a one-turn closed circuit, and because a thin conductor is used, there is a need for a lead-out structure and the electric field at the end. It becomes necessary to consider mitigation,
The problem was that the structure was complex and it took a long time to manufacture.

(Problems to be Solved by the Invention) An object of the present invention is to provide a transformer winding having a multilayer cylindrical structure that is compact and has a simple structure, which has good potential distribution characteristics within the winding without using a shield. It is in.

[Structure of the invention]

(Means for Solving the Problems) The transformer winding of the present invention has at least two layers of the multi-layer cylindrical winding in the transformer winding having a multi-layer cylindrical winding arranged concentrically around an iron core. It consists of two parallel insulated wire shaft elements formed by arranging insulated conductors in parallel in the axial direction and winding them in a spiral shape. The other insulated conductor at the end is connected to the starting end of one insulated conductor in the adjacent layer.

(Function) In the present invention, the amount of series capacitance between adjacent soot coil elements in one winding layer is increased, and the potential distribution when an impact voltage is applied is significantly improved. The present invention will be explained with reference to the embodiment shown in FIG.

FIG. 1 shows two layers of a multilayer cylindrical winding constructed according to the present invention.

In FIG. 1, a first cylindrical winding layer 1 consists of insulated coil elements 2 and 3 formed by arranging two insulated conductors in parallel in the axial direction and winding them in a predetermined turn. 2
~ 3a, two insulated coil elements 5, 6, the second cylindrical winding layer 4, whose terminations are indicated by 2b, 3b, are similarly constructed.
The starting end is indicated by 5a and 6a, and the ending point is indicated by 5b and 6b.

Here, the starting end 2a of the insulated coil element 2 is connected to the insulated coil element of the inner winding layer, and the terminal end 2b of the insulated wire shaft Mf-2 is connected to the starting end 3a of the insulated wire aS element 3. The end @3b is at the starting end 5a of the insulating wire axis M-'f-5 of the adjacent layer,
Further, the terminal end 5b of the insulated coil element 5 is connected to the starting end 6a of the insulated coil element 6, and the terminal end 6b of the insulated coil element 6 is connected to a line terminal.

With such a winding configuration, adjacent wA in the 5th winding layer
The series capacitance between the shaft elements is increased, and the potential distribution when an impulse voltage is applied is significantly improved.

The cylindrical winding structure according to the present invention can be applied to all the layers of the multilayer cylindrical winding, but it may also be applied to some or only a few layers on the line end side.

This is because, in general, the potential sharing between the layers on the application end side is severe;
This is because it is easy to divide the load into 5 layers in the layers away from the application end, so by improving only the application end side with the configuration of the present invention, it may be possible to obtain a sufficient dielectric strength in combination.

〔Effect of the invention〕

As described above, according to the configuration of the present invention, the potential distribution of the two multilayer cylindrical winding can be improved without using a shield, and a transformer winding having a multilayer cylindrical structure that is compact and has a simple structure can be provided. .

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of a transformer winding according to the present invention, and FIG. 2 is a schematic diagram showing a transformer winding using a conventional multilayer cylindrical winding. 1.4... Cylindrical winding layer 2, 3, 5, 6... Insulated coil element 2a, 3a, 5a, 6a... Starting end of each insulated wire shaft element 2b, 3b, 5b, 6b.
...Terminal end of each insulated coil element 7 ... Iron core 8
...Low voltage winding 9...High voltage winding 10.11.
．． 12,13.14...High voltage winding layer 15...Shield

Claims (1)

[Claims] In a transformer winding including a multilayer cylindrical winding arranged concentrically around an iron core, at least one layer of the multilayer cylindrical winding is formed by two disconnected conductors arranged in parallel in the axial direction and wound helically. The insulated conductor of one end of the layer is connected to the other insulated conductor of the beginning of the layer, and the other insulated conductor of the end is connected to the insulated conductor of one of the adjacent layers. A transformer winding characterized in that it is connected to the starting end of a conductor.