JPH0626223U - Coil device for electromagnetic induction equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] In a coil device configured by winding windings over a plurality of layers, the electric field concentration in the lead wire portion of the winding start of the first layer winding of the coil is relaxed, The purpose is to suppress the occurrence of partial discharge. [Structure] The lead wire at the beginning of the winding of the first layer is
Pull out to the outside from the turn of the layer winding. By this drawing, the first-layer winding of the second layer is wound outside the lead wire. Therefore, the outside of the lead wire is covered by the winding. This prevents the lead wire from protruding outward. Therefore, the concentration of the electric field at this portion is alleviated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coil device for electromagnetic induction equipment.

[0002]

[Prior art]

 An electromagnetic induction device, such as a transformer, is constructed by winding a low voltage coil B and a high voltage coil C around an iron core A as shown in FIG. Such a coil, especially a high-voltage coil, has a winding 1 of the first layer wound around the insulating cylinder 1 over a plurality of turns as shown in FIG. 3, and then a winding of the second layer through an interlayer paper 3. Wind 4 in multiple turns as well. In the same manner as described below, the winding 5 is wound on each layer through the interlayer paper 3 for a plurality of turns. Reference numeral 6 is a creeping band installed at the end of the first layer winding.

In the coil having such a configuration, the lead wire 7 connected to the first-turn winding 2A, which is the winding start portion of the first-layer winding 2, needs to be pulled out to the outside. As shown in FIG. 3, the lead wire 7 is drawn to the outside from the outside of the first turn winding 4A of the second layer winding 4.

However, when the lead wire 7 is drawn out in this manner, the lead wire 7 is projected outside the winding 4 A, so that the electric field is concentrated in this portion and partial discharge easily occurs. There is.

[0005]

[Problems to be solved by the device]

 According to the present invention, when winding is wound over a plurality of layers to form a coil, the electric field concentration in the lead wire portion of the winding start of the first layer is relaxed to suppress the occurrence of partial discharge. The purpose is to

[0006]

[Means for Solving the Problems]

 The present invention is characterized in that the lead wire at the beginning of winding of the first layer winding is drawn out from between the turns of the second layer winding.

[0007]

[Action]

 The lead wire at the beginning of the winding of the first layer is pulled out to the outside between the turns of the winding of the second layer, so that the lead wire of the second layer is placed outside the lead wire. At least the first turn of them will be wound. Therefore, the outer side of the lead wire is covered with the winding wire, which prevents the lead wire from protruding outward, and thus the concentration of the electric field at this portion is alleviated.

[0008]

【Example】

 An embodiment of the present invention will be described with reference to FIG. In addition, the portions denoted by the same reference numerals as those in FIG. 3 indicate the same or corresponding portions. According to the present invention, the lead wire 7 connected to the winding 2A is drawn to the outside from between the first-turn winding 4A and the second-turn winding 4B of the second-layer winding 4. I am trying. Therefore, the winding 4A is wound outside the lead wire 7.

When the winding 4A is wound on the outside of the lead wire 7 in this way, the outer surface of the lead-out portion of the lead wire 7 is covered with the winding 4A having a gentle arc shape, as shown in FIG. The protrusion caused by the lead wire 7 is eliminated. As a result, the concentration of the electric field in this portion is relaxed, and the occurrence of partial discharge is suppressed.

[0010]

[Effect of device]

 As described above, according to the present invention, among the windings forming the coil, the lead wire connected to the first turn of the first layer winding is drawn out between the turns of the second layer winding. As a result, the concentration of the electric field at the lead-out portion of the lead wire is relaxed, and the effect of being able to sufficiently suppress the occurrence of partial discharge as compared with the conventional configuration.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

FIG. 2 is a partial side view of FIG.

FIG. 3 is a sectional view of a conventional example.

FIG. 4 is a schematic sectional view of a transformer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation cylinder 2 First layer winding 2A First layer first turn winding 4 Second layer winding 4A Second layer first turn winding 4B Second layer 2 Turn winding 7 Lead wire

Claims (1)

[Scope of utility model registration request] 1. A coil device for an electromagnetic induction device, comprising: winding a plurality of layers on an insulating cylinder and winding a plurality of turns for each layer, wherein a winding start of a first layer of the plurality of layers is wound. The coil device for an electromagnetic induction device in which the lead wire is drawn out from between the turns of the second layer winding.