JPH0782944B2 - Iron core type high voltage reactor with gear - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core type high voltage reactor with a gear cap for compensating for a phase advance current in a high voltage power system.

[Conventional technology]

Recently, with the increase of high-voltage and large-capacity power cables and underground cables, iron core high-voltage reactors with high voltage of 220 to 500 KV and large capacities (hereinafter simply referred to as reactors) are being used more frequently. Natsuta. Such a reactor will be described with reference to the drawings.

FIG. 2 (a) is a vertical sectional view of a conventional reactor. In the figure, reference numeral 1 denotes a yoke, and an upper yoke 1a and a lower yoke 1b in this yoke 1 are shown. Reference numeral 2 denotes a main leg iron core provided between the upper yoke 1a and the lower yoke 1b, and the main leg iron core 2 is composed of a large number of block iron cores 21 and a gear cup 22 formed between the block iron cores 21. The intervals between the gears 22 are substantially equal. Reference numeral 3 is a winding wound concentrically on the main landing gear core 2. The winding 3 forms a high-voltage terminal 31 from an intermediate point in the height direction and a neutral point terminal 32 from the lower yoke 1b side to form an upper and lower parallel winding. Reference numeral 4 denotes an electric field adjusting insulator arranged on the high voltage terminal 31 side. Reference numeral 5 is a tightening fitting for the main landing gear core 2, and 6 is an upper and lower tightening rod.

2 (b) and 2 (c) are enlarged cross-sectional views of the windings at the portions indicated by alternate long and short dash lines IIb and IIc in FIG. 2 (a). In each figure, 33 is an electric wire having a cross-sectional area sufficient to handle 1/2 of the line current, and 34 is an insulating coating applied to the electric wire 33. The thickness of the insulating coating 34, towards the thickness t ₂ of the side of the insulating coating connected than the thickness t ₁ of the insulating coating on the side that is connected to the neutral terminal 32 to the high voltage terminal 31 is thicker. The insulation coating 34 and the electric field adjusting insulator 4 arranged on the high voltage terminal 31 side constitute step insulation.

FIG. 2 (d) is a distribution diagram of the average magnetic flux density of each gear of the main landing gear core shown in FIG. 2 (a). In the figure, the horizontal axis shows the average magnetic flux density, and the vertical axis shows the positions of the gears in correspondence with the positions shown in FIG. 2 (a). In the upper and lower parallel windings, the high voltage terminal 31
The average magnetic flux density of the gear up and down with respect to the center is symmetrically distributed. However, as shown in FIG. 2 (d), there is a difference in the average magnetic flux density of each gear. Then, due to the difference in the average magnetic flux densities, a vertical magnetic attraction force is generated between the block iron cores 21 and vibration is generated. You can

A means for adjusting the intervals of the respective gears 22 so that the average magnetic flux densities of all the gears 22 of the block iron core 21 are equal is presented in Japanese Patent Publication No. 61-22848.
By using this means, the above vibration can be almost eliminated.

In such a conventional reactor using the upper and lower parallel windings, in order to secure a creep distance L between the winding on the high voltage terminal 31 side and the winding on the side connected to the neutral point terminal 32, The height L _H of the wire 3 was extremely high, and the winding width W was also extremely large. Such drawbacks are eliminated by adopting the step insulation winding winding.

FIG. 3 (a) is a vertical cross-sectional view of a reactor that employs a step insulation winding coil. In the figure, the same parts as those shown in FIG. 2 (a) are designated by the same reference numerals. Reference numeral 8 is a winding wound concentrically on the main landing gear core 2. The winding 8 has a high voltage terminal 81 extending from the upper end in the height direction and a neutral point terminal 82 extending from the lower end to form a winding winding. Reference numeral 9 is an electric field adjusting insulator arranged on the high voltage terminal 81 side.

3 (b) and 3 (c) are enlarged cross-sectional views of the windings indicated by alternate long and short dash lines IIIb and IIIc in FIG. 3 (a). In each figure,
83 is an electric wire with a sufficient cross-sectional area to carry the line current, 84
Is an insulating coating applied to the electric wire 83. Regarding the thickness of the insulating coating 84, the thickness t ₂ of the insulating coating 84 on the high voltage terminal 81 side is made thicker than the thickness t ₁ of the insulating coating 84 on the neutral point terminal 82 side. The insulation coating 84 and the electric field adjusting insulator 9 constitute step insulation.

By adopting such a winding winding 8, the height of the winding 8
L _H ′ can be reduced to a height substantially equal to the creep distance L of the winding shown in FIG. 2 (a) (about half the height L _H of the upper and lower parallel windings). Further, the cross-sectional area of the electric wire 83 is almost twice as large as that of the electric wire 33 of the upper and lower parallel windings, but the amount of the insulating coating 84 occupying the winding is halved, and the winding width W'is parallel in the upper and lower directions. It can be made significantly smaller than the winding width W in the case of winding. As a result, the volume of the winding 8 can be reduced by 30 to 40% as compared with the volume of the upper and lower parallel windings 3.

[Problems to be Solved by the Invention]

In the case of the reactor employing the above-mentioned winding winding, the magnetic flux density distribution of each gear in the main landing gear core is shown in Fig. 3 (d).
As shown in. In FIG. 3 (d), the horizontal axis shows the average magnetic flux density, and the vertical axis shows the positions of the gears corresponding to the positions shown in FIG. 3 (a). Due to such magnetic flux density distribution, the following problems occur in the reactor employing the winding winding.

That is, as described above, if there is a difference in the magnetic flux densities of the gears 22, a magnetic attraction force is generated between the block iron cores 21 and vibrations occur in the main landing gear core 2. Considering this vibration, since the magnetostriction of the yoke 1 is small, the left and right yokes 1 with the main landing gear core 2 as the center do not generate vibrations in the left-right asymmetrical mode, and the generated vibrations are vertically asymmetrical. It becomes a symmetrical mode. That is, in the winding winding 8, the high-voltage terminal 81 side generally requires an insulation distance L ₂ from the upper yoke 1a (larger than the insulation distance L ₁ between the lower yoke 1b and the neutral point terminal 82). The thicker coating of the electric wire in this portion and the presence of the electric field adjusting insulator 9 reduce the ampere-turn density and increase the fringing in each gear 22. Therefore, the average magnetic flux density of the gear on the side of the high voltage terminal 81 becomes smaller than the average magnetic flux density of the gear on the side of the neutral point terminal 82, as shown in FIG. 3 (d). Then, due to such average magnetic flux density distribution, the vibrations in the above-mentioned asymmetrical and laterally symmetric modes occur.

This vibration will be specifically described with reference to the diagram shown in FIG.
In FIG. 4, the upper and lower horizontal lines indicate the upper yoke 1a and the lower yoke 1b, and the left and right vertical lines indicate the side yokes 1c and 1d on both sides of the yoke 1.
The vertical lines in the center represent the main landing gear cores 2, respectively. During the operation of the reactor, this reactor generates vibrations (such vibrations are called ramen vibrations) that cause deformation as shown by a broken line in FIG. This vibration is generated by the vibration force that vibrates the entire structure in the vertical direction, and the entire structure vibrates in the vertical direction. Therefore, the tightening by the tightening metal fitting 5 and the vertical tightening rod 6 is completely against the above vibration. It has no effect.

In order to prevent the occurrence of such vibration, application of the means described in Japanese Patent Publication No. 61-22848 mentioned above is considered. However, this means must measure the magnetic flux densities of adjacent gears one after another and adjust the intervals between the gears so that the magnetic flux densities are the same, and it takes a lot of time to adjust all the gears. It requires a lot of manpower and becomes an extremely troublesome task. In particular, the adjustment of the gap between the neutral point terminals 82 is significantly more difficult than the adjustment of the gap between the upper gears because the gears are located below the main leg iron core 2. After all, the means described in the above publication is practically difficult to apply. And, if this means is not adopted, the above vibration cannot be avoided, and in order to avoid this vibration, it is inevitable to accept the disadvantage of enlarging the size of the windings as upper and lower parallel windings.

The present invention has been made in view of such circumstances,
The purpose is to solve the above-mentioned problems of the prior art, provide an iron core type high pressure reactor with a gear cup that can make the entire structure small and easily reduce vibrations in vertical asymmetrical and horizontal symmetrical modes. There is.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a main landing iron core configured by stacking a predetermined number of block cores with a gap therebetween, and a stepped insulation of concentric arrangement on the outer circumference of the main landing iron core. In a cored high voltage reactor with a gap provided with a winding winding, the gap between the block cores in the height direction of the main landing iron core is arranged at an arbitrary interval from the center, and from the center. The gap between the upper block cores is adjusted and arranged so that the magnetic flux density distribution of each gap is symmetrical to the magnetic flux density distribution of each of the lower gaps.

[Action]

The block cores from approximately the center to the bottom of the main landing gear core are arranged with an appropriate gap interval. On the contrary,
Each of the block cores from the center to the upper part is arranged by adjusting the gap between the upper gears so that the magnetic flux density distribution of the gear cores becomes symmetrical to the magnetic flux density distribution of the lower gears. In this way, by making the magnetic flux density distribution symmetrical, the ramen vibration is significantly reduced, and it is possible to adopt the winding winding.

〔Example〕

 Hereinafter, the present invention will be described based on the illustrated embodiments.

FIG. 1 (a) is a longitudinal sectional view of a reactor according to an embodiment of the present invention. In the figure, the same parts as those shown in FIG. As the winding 8 of this embodiment, a step insulation winding winding is used as in the winding shown in FIG. 3 (a). Reference numeral 11 denotes a main landing gear core, which has a different structure from the main landing gear core 2 shown in FIG. One-dot chain line C
Indicates almost the center of the main landing gear core 11. 11U is each block iron core that constitutes the upper main landing iron core from the central portion C, 11G _U is their gears, 11D is each block iron core that constitutes the lower main landing iron core from the central portion C, and 11G _D is These gears are shown.

In the present embodiment, the ramen vibration that occurs when the step insulation winding winding is adopted is greatly suppressed by utilizing the characteristics of the magnetic flux density distribution in the upper and lower parallel windings. It is possible to use through windings.

That is, in the present embodiment, the lower block iron cores 11D are arranged with the gears 11G _D at arbitrary intervals, for example, the same intervals d. On the other hand, the upper block iron cores 11U are arranged such that the average magnetic flux density distribution of their respective gears 11G _U is symmetrical to the average magnetic flux density distribution of their lower gears 11G _D with respect to the central portion C. . For this reason,
In each of the upper gaps 11G _U , the gap spacing is adjusted. For the reason described above, the average magnetic flux density distribution when the winding winding 8 is adopted is shown in FIG. 3 (d).
When the above-mentioned gear gap is adjusted, the gear gap between the upper gears 11G _D is smaller than the gear gap between the lower gears 11G _U. That is, the gap distance on the high voltage terminal side is made smaller than the gear gap distance on the neutral point terminal side, whereby the average magnetic flux density of the gear trap can be made vertically symmetrical.

FIG. 1 (b) is a distribution diagram of the average magnetic flux density of the gears when the gear gaps of the upper gears are adjusted. The horizontal axis shows the average magnetic flux density distribution, and the vertical axis shows the distribution of the average magnetic flux density. The position corresponds to the position shown in FIG. 1 (a). From this figure, it is found that the gear gaps of the upper gears 11G _U are adjusted so that the average magnetic flux density distribution of the upper gear is symmetrical with respect to the central portion C with the average magnetic flux density distribution of the lower gear. I understand.

As described above, in the present embodiment, the stepped insulation winding winding is adopted, and the gaps of the lower gears of the main landing gear core are arranged at equal intervals. Since the gap between the upper gears is adjusted so that the average magnetic flux density distribution of is symmetrical with respect to the central part, the overall structure can be made compact and the vibration of the rigid frame can be significantly reduced, and Noise can be reduced. Also, since only the gap between the upper gears is adjusted, when considering the adjustment to make the magnetic flux densities of all the gears equal, compared to this, the labor and time required for the adjustment also consider the workability. Then, it becomes a remarkable decrease.

In the description of the above embodiment, the neutral point terminal is provided in the lower portion and the high voltage terminal is provided in the upper portion, but the neutral point terminal is provided in the upper portion and the high voltage terminal is provided in the lower portion. Even so, it is obvious that the present invention can be applied. Further, it is obvious that the lower gears are not limited to the equal intervals as exemplified in the above embodiment, but may be any intervals. Furthermore, the electric field adjusting insulator is not always necessary and can be omitted.

〔The invention's effect〕

As described above, in the present invention, the stage insulation winding winding is adopted, and the block cores of the lower part from the substantially central portion of the main landing gear core are arranged at arbitrary gear gaps, and the upper gear gap is Since the average magnetic flux density distribution is adjusted to be symmetrical with the average magnetic flux density distribution of the lower gap, the overall structure of the reactor can be made small, and
Ramen vibration can be significantly reduced and noise can be reduced. Further, the gear gap is adjusted only on the upper part of the main landing gear core, so the work is easy and the labor and time required for the adjustment can be reduced.

[Brief description of drawings]

1 (a) and 1 (b) are a longitudinal sectional view of a reactor according to an embodiment of the present invention and an average magnetic flux density distribution diagram of its gear, and FIGS. 2 (a), (b), (c), and (d). ) And the third
Figures (a), (b), (c), and (d) are a vertical cross-sectional view of each conventional reactor, a winding cross-sectional view, and an average magnetic flux density distribution diagram of the gear, and Fig. 4 is shown in Fig. 3 (a). It is a diagram explaining the vibration which occurs in the reactor shown. 1 ... Yoke, 8 ... Step insulation winding, 11 ... Main landing gear core, 11U ... Upper block iron core, 11D ... Lower block iron core, 11G _U ... Upper gear tap, 11G _D ... Lower gear tap

Claims (3)

[Claims] 1. A main leg iron core formed by stacking a predetermined number of block cores with a gap therebetween, and a step-insulating winding coil concentrically arranged on the outer periphery of the main leg iron core. In the core type high voltage reactor with a gap, the gaps of the block cores from the center to the bottom in the height direction of the main landing iron core are arranged at arbitrary intervals, and the gaps of the block cores from the center to the top are arranged. Is arranged so that the magnetic flux density distribution of each gap is symmetrical with the magnetic flux density distribution of each of the lower gaps. 2. The adjustment of the gap between the block cores in the upper portion according to claim 1, wherein a high voltage terminal is arranged above the winding winding and a neutral point terminal is arranged below the winding winding. If it is, the adjustment is performed to reduce the gap between the high-voltage terminal side and the high-voltage reactor with a gap. 3. The gap according to claim 1, wherein the gap between the block cores on the upper side is adjusted by disposing a neutral point terminal on the upper side of the winding winding and a high voltage terminal on the lower side. If so, the core-shaped high-voltage reactor with a gap is characterized in that the gap between the neutral point terminals is increased.