JPS6081809A - Direct current electric induction apparatus - Google Patents

Abstract

PURPOSE:To simplify the coupling of a high voltage lead wire and a winding without lowering their insulating efficiency by a method wherein a high voltage lead wire, the outside of which is insulated, is vertically inserted into the aperture part of an electrostatic ring from a part on the circumferential direction, and the lead wire is connected to the uppermost winding having one half of turns comparing with the unit of other windings. CONSTITUTION:An aperture part 10, to be turned to the flow channel of insulating oil, is provided almost in the center of electrostatic shields 15a and 15b to be used for relief of electric field of a winding terminal part. Besides, insulating barriers 12 and 18 are coated on the circumference of a winding 3, inner and outer insulating tubes 1 and 2, and electrostatic shields 15a and 15b. The uppermost winding 3a, among the windings stacked in axial direction, is wound approximately one half of the number of turns comparing with the unit of other windings, and the outer circumferential part of said winding is positioned almost on the same circumference of the aperture part 10 located in the center of the electrostatic shield. According to this constitution, the insulated high voltage lead 14 can be vertically led out easily through the aperture part of the electrostatic shield, thereby unnecessitating the lead-in of the high voltage lead wire having unreasonable bending angle between the electrostatic sheild 15b and the uppermost winding 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a DC induction electric appliance with an improved method of coupling high voltage lead wires and windings.

[Technical background of the invention and its problems]

The basic internal structure of a DC induction device, typified by a transformer for a DC power transmission converter, is almost the same as that of an AC induction device, typified by a power transformer. An example is shown below.

Conventionally, the disk winding of an induction electric device such as a forced cooling type transformer or an accelerator is a plurality of wire conductors formed by winding a wire conductor between inner and outer insulating tubes 1 and 2, as shown in Fig. 1. Winding units 3 consisting of so-called disk windings are sequentially arranged in the axial direction. Between the winding units 3, a plurality of horizontal duct pieces (not shown) are arranged along the radial direction to form horizontal cooling passages (hereinafter referred to as horizontal cooling passages) 4 partitioned at equal pitches. At the same time, a plurality of vertical duct pieces (not shown) extending in the axial direction are provided between each winding unit 3 and the inner and outer insulating cylinders 1.2, so that a plurality of vertical duct pieces (not shown) are arranged in the circumferential direction corresponding to the horizontal cooling passages 4. Inner and outer axial cooling passages (hereinafter referred to as vertical cooling passages) 6 are formed at equal pitches along the shaft. Further, in the vertical cooling passage 6, a baffle plate 5 is attached to the inside or outside of every several winding units 3, and the flow passage is arranged in a zigzag pattern to improve cooling efficiency.

In addition, an electrostatic shield 16 is attached to the upper end of the winding formed by stacking a plurality of winding units 3 as described above, to serve as a shield for alleviating the electric field, so that dielectric breakdown due to electric field concentration at the end of the winding is prevented. is prevented.

Furthermore, the insulating medium that has passed between the winding units 3 of the winding in a zigzag manner is passed through the opening 17 cut out in the upper part of the outer insulating cylinder 2 outside the end of the uppermost winding unit (3-1). It's time to go outside.

However, in a configuration in which a winding consisting of another unit winding is wound outside this winding, the insulation distance between the windings is determined by the stress of the opening 17 that serves as the outlet for the insulating medium. become. Furthermore, even in the case where there is no separate winding as described above, the insulation distance to the inner wall of the tank is determined.

That is, when the insulating medium is, for example, transformer insulating oil, the destructive stress of the oil gap is expressed as E=-g-t/3 (K is a constant and 9g is the oil gap length). Therefore opening 1
The larger the length of 7, that is, the larger the notch, the lower the breakdown stress, so the overall insulation distance must be increased.

In order to prevent this problem, a structure as shown in FIG. 2 was devised. That is, the space between the inner insulating cylinder 1 and the outer insulating cylinder 2 is closed by an electrostatic shield 7.8 having an opening 10 in the center, and a conventional insulating oil outlet (1 in Fig. 1) is closed.
7) was closed with the winding outer insulating cylinder 2. In this configuration, oil flows out of the opening 10 in the cap of the electrostatic shield 7.8. In addition, the conventional weak point (part 17 in Fig. 1)
The insulation can be strengthened by covering it with the outer insulating cylinder 2.

Now, if the high voltage lead is passed through the opening of the electrostatic shield and connected to the uppermost winding at the end of the winding having the above configuration, the lead configuration shown in FIG. 2 will be obtained. In the figure, the high voltage lead 9 between the electrostatic shield 7 and the winding is bent at right angles to the lead insertion angle. In other words, this is a rather unreasonable insulation structure, and is difficult to manufacture in a large-capacity device with a large high-voltage lead diameter.

[Purpose of the invention]

The present invention has been made in consideration of the above points, and its purpose is to provide a direct current induction device with a structure that allows easy connection of high voltage lead wires and windings without deteriorating insulation performance. The purpose is to provide electrical appliances.

[Summary of the invention]

In order to achieve the above object, the present invention has a plurality of winding units formed by winding a wire conductor between an inner insulating cylinder and an outer insulating cylinder inserted into an iron core, and connecting the winding units to each other through a spacing member. In a DC induction device that is stacked to form a winding, the end of the winding is provided with an electrostatic shield for mitigating the electric field, and the container is housed inside and filled with an insulating medium, the inner and outer insulating tubes are connected to each other. is occluded by the electrostatic ring, and
A sharp opening for the insulating medium is formed in the center of this electrostatic ring, and a high voltage lead wire with external insulation is inserted vertically from a part of the opening in the circumferential direction, and connected to other winding units. In comparison, this type is characterized by being connected to the uppermost winding having approximately 1/2 the number of windings.

[Embodiments of the invention]

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the DC induction electric appliance of the present invention will be described with reference to the drawings. The DC induction electric appliance of the present invention has a structure shown in FIG. In FIG. 3, a winding unit 3 consisting of a plurality of so-called disk windings formed by winding a wire conductor between inner and outer insulating cylinders 1 and 2 is sequentially axially similar to the conventional case. Arranged. 4. Cooling path horizontal to the windings.
The vertical cooling passages 6 and the like are secured in the same manner as in the past. In addition, an electrostatic shield 15a for alleviating the electric field at the end of the winding.
, 15b is provided with an opening 10 that serves as a flow path for the insulating oil. Furthermore, winding 3. Inner and outer insulation tubes 1 and 2
, an insulating barrier 17 is placed around the electrostatic shields 15a and 15b.
It is covered with 2.18. These structures are almost the same as conventional ones. In the present invention, the uppermost winding 3ak of the windings stacked in the axial direction is approximately l/2 compared to other winding units.
The number of windings was the same, and the outer periphery of this winding was positioned on approximately the same circumference as the central opening of the electrostatic shield. With this configuration, as shown in Figure 3, the insulated high voltage lead 1
4 not only allows the electrostatic shield to be pulled out vertically through the entire opening, but also eliminates the unreasonable bending angle between the electrostatic shield 15b and the top winding 3a, which was a drawback of the conventional structure. There is no need to pull in the high voltage lead you have. As a result, it becomes possible to manufacture a large capacity container with a large high voltage lead diameter. Moreover, the difference in size of the electrostatic shield 7.8 shown in FIG. 2 can also be eliminated. This makes it easier to manufacture the electrostatic shield.

In this example, we have explained a DC induction electric appliance in which the tank is filled with insulating oil as a cooling and insulating medium.
The present invention is also applicable to direct current induction electric appliances filled with F, gas, etc. cooling and insulating media. [Effects of the Invention] As described above, according to the present invention, high voltage leads and windings can be easily manufactured. Can be combined relatively easily. Furthermore, the electrostatic shield is also easier to process than in the past. From these facts, it will become possible to manufacture large-capacity DC induction electric appliances that are expected to be produced in the future, and they will also be highly reliable in terms of insulation.

[Brief explanation of drawings]

FIGS. 1 and 2 are cross-sectional views showing the winding structure of a conventional DC induction device, respectively, and FIG. 3 is a cross-sectional view showing an embodiment of the present invention. 1...Inner insulating tube 2...Outer insulating tube 3...Winding unit 3a...Top winding 4...Horizontal cooling path 5...Baffle plate 6...Vertical Directional cooling path 7.
8... Electrostatic shield 9... High voltage lead wire 10... Electrostatic shield opening 11... Insulating plate 12... Insulating barrier 13...
Opening of insulating plate 14...High voltage lead wires 15a, 15
b... Electrostatic, shield 16... Electrostatic shield 17... Opening 18...
Insulation barrier Figure 1 Figure 2

Claims (2)

[Claims] (1) Forming a winding by stacking a plurality of winding units formed by winding a wire conductor between an inner insulating cylinder and an outer insulating cylinder inserted into an iron core via a spacing member, In a DC induction device that is equipped with an electrostatic shield for electric field mitigation at the end of the winding, and is housed inside a container and filled with an insulating medium, the space between the inner and outer insulating cylinders is closed by the electrostatic ring. At the same time, an opening is formed in the center of this electrostatic ring to serve as a flow path for the insulating medium, and an externally insulated high-voltage lead wire is vertically inserted into a part of the opening in the circumferential direction. A direct current induction electric appliance characterized by being coupled to the top winding with approximately 1/2 the number of turns compared to the DC induction electric appliance. (2) The DC induction electric appliance according to claim 1, characterized in that the outer periphery of the uppermost winding is located on substantially the same circumference as the opening at the center of the electrostatic shield.