JPS6035504A - Winding for dc electric induction apparatus - Google Patents

Abstract

PURPOSE:To enable to secure the dielectric strength at the flow out aperture part of insulating oil of a disc winding and the lead out aperture part of a high-tension lead wire by a method wherein insulation is reinforced in such a manner that the region ranging from the point in the vicinity of the press-plate of the high-tension lead wire led out through the aperture part of the press-plate to the point located near the aperture part of an electrostatic shield is covered by an insulating pipe. CONSTITUTION:The upper aperture part located between insulating pipes 1 and 2 on the inside and outside of a disc winding are blocked using electrostatic shields 8 and 9 and insulating barriers 10, 11 and 12 excluding the aperture part 7 in the center part. The insulating oil which has been flown cooling each winding unit 3 of the disc winding flows out to outside through the aperture part 7. The outer circumferential part, ranging from the point located in the vicinity of the aperture part 14 of a press-plate 13 on the high-tension lead wire 15 connected to the tip winding unit 3a to the point in the vicinity of the center aperture part 7 of the electrostatic shields 8 and 9, is covered by the insulating pipe 16 consisting of a pressboard. As a result, the percentage of potential allotment of the insulating pipe 16 is increased, the percentage of potential allotment of the internal part high-tension lead wire 15 is reduced, and a high electric field is eliminated, thereby enabling to accomplish an insulating constitution having no weak point part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a high voltage lead - an insulation modification Q near 〇, and a Bt DC visiting grinder winding.

[Technical background of the invention and its problems]

Direct current induction system (DC induction transducers such as transformers and reactors used in converters have a basic internal structure (
＝It can be said that it is a single power transformer as well.

The transformer windings also use disk windings, like forced cooling transformers. M of this class of disk winding
Alternatively, as is well known, (a plurality of disc winding units are stacked between two inner insulating cylinders and an outer insulating cylinder via a horizontal passage and a vertical passage C: between them and the insulating cylinder, and then The upper and lower ends of the inner and outer insulating cylinders are wrapped with a P3 edge barrier to reinforce the insulation.The upper and lower ends of the disc winding (two shields are provided to reduce the electric field at the ends). νp1 is tightened by its upper valve plate and lower valve plate.

The problem with such disk windings is that the insulating oil flows through the horizontal and vertical roads in the disk windings and out of the street wires (through the openings where it flows out and the high-voltage leads of the windings). In other words, in the case of an oil-immersed transformer, the breaking stress E of the gap occupied by insulating oil is E=−G” (K is a constant and G is the oil gap length). Therefore, as the notch 9 of the opening serving as the insulating oil outlet or lead outlet becomes larger, the breaking stress decreases, and therefore, the insulation distance of the entire assembly must be increased.

In order to prevent such problems and minimize the insulating weak points, the insulating oil outlet and the high voltage lead wire outlet are located at the center of the upper ends of the inner and outer insulating cylinders of the disc winding. An opening is provided, and the circumference of this opening is closed with an electrostatic shield, so that the insulating oil flows out from the opening in the center of the electrostatic shield (-), and the high voltage lead wire passes through the upper valve plate and All configurations are adopted in which the top winding unit (-) is connected through the central opening of the magnetic shield.

However, in the case of such a disc winding insulation configuration, the insulation strength of the high voltage lead wire (==) is either wrapped thickly with insulating paper until it reaches the holding plate, or the winding is wrapped from the part that passes through the opening in the holding plate. A thin layer of insulating paper is applied to the area below the holding plate where almost no voltage is applied to the unit. Even if it is covered by the holding plate, the DC potential distribution changes rapidly (=).The DC potential distribution tends to be determined by the thickness of the insulating paper. As a result, the potential of the thick lead wire of the insulating paper above the presser plate remains as it is, and the potential of the thin lead wire of the insulating paper below the presser plate (2). Therefore, the lead-out portion of this high-voltage lead wire is the weak point on the DC insulation.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a DC induction winding which can ensure the P3 edge strength of the insulating oil outflow opening of the disc winding and the high voltage lead core lead-out opening.

[Summary of the invention]

The present invention (2) provides a direct current inductor (4-) in which an electrostatic shield is placed above the uppermost winding unit of the disk winding (2) and has an opening that serves as an outlet for the cooling insulating medium. Insulate the high voltage lead wire from the top winding unit through the opening of the uppermost winding unit and the opening of the holding plate to the vicinity of the opening of the electrostatic shield with an insulating tube. It is characterized by being reinforced with insulation.

[Embodiments of the invention]

The present invention will be described below with reference to embodiments shown in the drawings. In the drawings, the space between the inner insulating cylinder 1 and the outer insulating cylinder 2
The winding units 3 of the disk winding are stacked in a required number of stages.

The distance between the winding unit 3 (the vertical path 4) and the distance between the winding unit 3 and the inner and outer insulating cylinders 1°2 (-vertical path 5'?
C is formed, and the middle step of the winding unit 3 is a rainbow? A cutting board 6 is provided. The insulating oil that is forcibly fed into the two disk windings is applied to the horizontal road 4, the vertical road 5 and the floor 1 plate 61; therefore, the zigzag I: R, iL 'C improves the cooling efficiency. are doing.

Therefore, in the present invention (2), the uppermost part of the disc winding unit 3 is connected to the central part (=static magnetic shield 8.9 having the opening 7).
The outside is insulated and reinforced and insulated with (-rear lO).In addition, the inner and outer insulation tubes 1 and 2 of the two-disc winding and both sides of the static magnetic shield 8 and 9 are insulated with an insulating barrier. 11, and the upper part of the static magnetic shield 8t9 is also insulated and reinforced with an insulating carrier 12 except for the central opening 7. Therefore, the upper part between the inner and outer insulating cylinders 1.2 of the disc winding is The opening is
Except for the central opening 7, it is closed with magnetostatic shields 8, 9 and insulating carriers 10, 11, 12.

Now, the disc winding having the two configurations is wound around the iron core leg (not shown) and fixed by tightening the upper valve plate 13 and the lower valve plate (not shown). Each winding unit 31!i of the disk winding: The insulating oil that has flowed in a zigzag pattern while being cooled passes through the central opening 7 of the static magnetic shield 8.9 and the opening 7 of the edge parrier 10.12. Through the outside (two flows out.

In addition, in the axial direction of the disc winding (- in the stacked winding single M3, the uppermost winding unit 3a is The outer peripheral end of the winding 3a is located on the same circumference as the central opening 7 of the electrostatic shield 8.9.

The winding end of this winding unit 3a (=opening 14 of presser plate 13,
A high voltage lead 15 is connected which is led through the opening 7 of the insulating barrier and electrostatic shield 8.9.

For the sake of construction, this high voltage lead wire 15 is made by reducing the thickness of the binding paper of the part 15a from the vicinity passing through the holding plate 13 to the winding unit 3a, and
The thickness of the insulating paper is increased. Furthermore, the outer periphery of the high voltage lead wire 15 from the vicinity of the opening 14 of the holding plate 13 to the vicinity of the central opening 7 of the shields 8 and 9 is covered with an insulating tube 16 made of pressboard. This insulation part 16
The disk winding is inserted from the opening 14 of the holding plate 13 into the center opening 7 of the shield 8.9 (vertical to the opposite direction), and the curve between its upper end and the holding plate 13 is The height T is secured by a distance corresponding to the thickness T (-) of the presser plate 13.

Insulation structure around this high voltage lead wire 15 The proportion of the share is small, and the insulation structure (two can be made) with no weak points, and the ratio of the share is small.

Although the explanation has been made using insulating oil as the insulating medium in the disc winding, it is also possible to implement cooling using chlorofluorocarbon, SFa gas, etc., or direct current equipment using an insulating medium (2).

〔Effect of the invention〕

As described above (according to the present invention, the upper part of the uppermost winding unit in the disc winding constructed by combining the required number of disc winding units with the frontage of the inner and outer insulating cylinders). An electrostatic shield is placed over the center opening (2) The area near the top of the disk winding including the electrostatic shield is insulated with an insulating barrier except for the corresponding opening (2). In addition, the high-voltage lead wire that is dedicated from the opening of the holding plate is connected to the uppermost winding unit (two connected, and the +
By inserting an insulating tube into the rj' 2 and reinforcing the insulation up to the center opening of the shield, the insulation is reinforced at the outflow opening for the coolant in the circle and coil melting area and at the uniform opening for the high voltage lead wire. As a result, there is no insulating weak point, and it is possible to obtain a DC d-conductor-wound paddy for voltage use.

[Brief explanation of drawings]

The drawing is a cross-sectional view showing an example of direct current or 1A type rice rolling according to this method.

Claims (4)

[Claims] (1) Between the inner and outer 7 rib cylinders (2 required number of disc windings 1iI
li! A blood flow device that drains disk windings constructed by stacking the disk windings (= a device that has a central opening at the top of the uppermost winding unit that serves as an outlet for the cooling insulating medium). When arranging the V tunnel shield (2), the surrounding area is insulated and reinforced with an insulating barrier except for the open part, and from the top winding level to the center of the static center &d C1 negative 1 (and 1) A DC soap characterized in that a high voltage lead wire, which is drawn out through the four openings of the pushing plate, is covered with an insulating surface for reinforcing insulation from the vicinity of the opening 1i of the pushing plate to the vicinity of the opening of the static magnetic shield. Nitunki winding. (2) Position the center opening of the static magnetic shield, the opening of the insulating barrier, and the opening of the holding plate in the shape of an IWJ-straight door,
2. A countersunk dielectric coil winding according to claim 1, wherein an insulating cylinder of a high-voltage lead wire is inserted into each opening (two openings) in a straight line. (3) The number of turns of the uppermost winding unit is calculated as a percentage of the number of turns of other winding units, and its outer circumference is l! 2. The direct current A conductor winding heel according to claim 1, wherein the IL conductor is located on the same circumference as the central opening of the static magnetic shield. (4) The length of the insulating cylinder that fully covers the high voltage lead wire, which protrudes from the holding plate, is approximately equal to the thickness of the upper holding plate, as set forth in claim 1. .