JPH0121539Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a three-phase reactor used in phase adjustment equipment of substations, etc.

Prior Art A large-capacity shunt reactor (hereinafter simply referred to as a reactor) is, as shown in Figures 1 and 2,
Annular upper and lower core yoke parts 1 and 2, core leg parts 3 of each of the three phases disposed across both core yoke parts 1 and 2, and core leg parts of each phase, respectively. The stacking width (radial dimension) of the upper and lower core yoke parts is set equal to the diameter of the core leg part. Upper core yoke part 1
Upper and lower core fastening fittings 7 and 8 are arranged on the lower surfaces of the upper and lower core yoke parts 2 via insulating plates 5 and 6, respectively, and the winding support is fixed to the lower winding tightening fitting 8. The lower end of the winding 4 is in contact with a lower winding tightening member 10 disposed at the upper end of the metal fitting 9. Also, an upper winding tightening member 1 is attached to the upper end of each winding 4.
1 is arranged and the winding tightening bolt 12 is screwed into the screw hole provided in the upper winding tightening fitting 7.
The winding 4 is tightened in the axial direction via an upper winding tightening member 11. The upper and lower winding tightening members (insulators) 11 and 10 are formed in an annular shape along the upper and lower ends of each winding 4. The entire reactor is housed in an iron case 13.

By the way, in this type of conventional reactor, only the winding tightening members 11 and 10 made of an insulator are provided on the upper and lower end surfaces of the winding 4, and the upper and lower end surfaces of the winding are located inside the core window. Since it was not magnetically _shielded except for the part located at I couldn't help it. This not only increases stray loss but also causes local overheating on the side walls of the case.

Purpose of the invention The purpose of the present invention is to provide a three-phase reactor that reduces leakage magnetic flux, reduces stray loss, and prevents local overheating in the case.

Composition of the invention The present invention consists of an annular upper core yoke section, a lower core yoke section, and a 3-wire structure that is disposed astride between both core yoke sections.
It is a three-phase reactor consisting of a core leg of each phase and a winding wound around each core leg. An annular upper inner shield core and an annular upper outer shield core are provided that span the upper ends of the windings of each of the three phases, and the lower ends of the windings of each of the three phases are disposed on the inner and outer peripheral sides of the lower core yoke, respectively. An annular lower inner shield core and lower outer shield core are disposed astride the annular lower inner shield core and lower outer shield core. The windings of each of the three phases are axially tightened and fixed via each of the shield cores.

With the above configuration, leakage magnetic flux generated from the windings of each phase will flow into the shield core closest to the end face of the windings. Furthermore, since a return path for the leakage magnetic flux is formed by the annular shield core, the leakage magnetic fluxes of the three phases cancel each other out, making the total sum zero, and the magnetic flux that has once flowed into the shield core does not flow out to the outside. Therefore, almost no magnetic flux flows toward the case side of the reactor, which not only greatly reduces stray loss but also prevents local overheating in the case. In addition, since each shield core straddles the end faces of the three-phase windings and tightens these windings, even if the heights of the three-phase windings are slightly uneven, the tightening force on the end faces of each phase winding can be maintained. By adjusting the amount, each winding can be tightened equally.

Furthermore, since the shield cores, which are arranged above and below, also serve as winding tightening members, the structure is simpler than that of conventional reactors, which have winding tightening members arranged above and below for each phase winding. It is possible to simplify the process and reduce costs.

Embodiment An embodiment of the present invention will be described below with reference to FIG.

FIG. 3 is a sectional view showing the configuration of one phase of an embodiment of the present invention, and corresponds to the sectional view taken along line A--A in FIG. 1. In FIG. 3, the core leg portion 3 includes a plate-shaped unit core 301 and this unit core 30.
A non-magnetic spacer 302 disposed adjacent to 1
The upper and lower core yoke parts 1 and 2 are formed by winding a steel strip so that they have a radial dimension (width dimension) approximately equal to the diameter of the core leg part 3. It consists of an annular wound iron core formed by turning. A winding 4 is fitted around each core leg 3 and wound around the core leg 3 . 20 and 21 are an upper inner shield core and an upper outer shield core, respectively;
Reference numerals 2 and 23 denote a lower inner shield core and a lower outer shield core, respectively, and these shield cores are made of an annular wound core formed by winding a steel strip. The upper inner shield core 20 and the upper outer shield core 21 are disposed on the inner and outer circumferential sides of the upper core yoke part 1, respectively, and span the windings 4 of each of the three phases.
It is arranged concentrically with the upper core yoke part 1 and is in contact with the upper end surface of the winding 4 via insulators 25 and 26. The insulators 25 and 26 are intended to provide insulation between the upper end surface of the winding 4 and the shield cores 20 and 21. These insulators may be formed in a ring shape like the shield core, and each winding It may also be formed to a size that contacts only a part of the upper end surface of 4.

The lower inner shield core 22 and the lower outer shield core 23 are arranged inside and outside the lower core yoke part 2, respectively, over the windings 4 of each of the three phases, and concentrically with the lower core yoke part 2. , are in contact with the lower end surface of the winding 4 via insulators 27 and 28. The configurations of these insulators 27 and 28 are similar to those of upper insulators 25 and 26.

The upper core clamping fitting 7 is brought into contact with the upper surface of the upper core yoke part 1 via the insulating plate 5, and the lower core yoke part 2
A lower core fastening fitting 8 is in contact with the lower surface of the iron core with an insulating plate 6 interposed therebetween. The upper and lower core fastening fittings 7 and 8 are, for example, annular plates having a slightly larger outer diameter than the upper and lower core yoke parts, a slightly smaller inner diameter, and a predetermined thickness, as shown in the figure. The upper and lower core yoke portions 1 and 2 are tightened in the direction in which they are drawn toward each other by the tightening bolts that do not touch each other.
and the core leg portion 3 are vertically tightened and integrated.

A plurality of winding support fittings 30 are provided at predetermined intervals in the circumferential direction of the lower core yoke portion 2 at positions of the lower core tightening fitting 8 facing the lower inner shield core 22 and the outer shield core 23, respectively. 30,...
and 31, 31, ... are fixed, and the support plate 3 is fixed to the upper end of the inner winding support fittings 30, 30, ...
2, 32,... on the upper surface of the lower inner shield core 22
However, the lower outer shield core 23 is in contact with the upper surface of the support plates 33, 33, . . . which are fixed to the upper ends of the outer winding support fittings 31, 31, .

A plurality of screw holes are provided at predetermined intervals in the circumferential direction of the upper core yoke at positions of the upper core fastening fitting 7 facing the upper inner shield core 20 and the upper outer shield core 21, respectively, A winding tightening bolt 34 is screwed into a screw hole provided on the inner circumferential side of the yoke portion 1, and a winding tightening bolt 35 is screwed into a screw hole provided on the outer circumferential side of the yoke portion 1. There is. The lower ends of the tightening bolts 34 and 35 are brought into contact with the upper surface of the upper inner shield core 20 and the upper surface of the upper outer shield core 21, respectively, via the tightening plates 36 and 37, and by tightening these tightening bolts 34 and 35, Winding 4 is axially tightened. Note that 38 and 39 are lock nuts screwed onto the tightening bolts 34 and 35, respectively.

In the above embodiment, the outer peripheral surfaces of the upper and lower inner shield cores 20 and 22 are connected to the winding 4.
The respective outer diameter dimensions are set so that they are located at approximately the same position as the inner circumferential surface of both shield cores 20.
The radial dimensions of and 22 are set approximately equal to the radial dimension (winding thickness) of the winding 4. In addition, the inner diameter dimensions of the upper and lower outer shield cores 21 and 23 are set such that their respective inner peripheral surfaces are located at approximately the same position as the outer peripheral surface of the winding 4, and the radial dimensions of both shield cores 21 and 23 are is winding 4
It is set approximately equal to the radial dimension of.

As mentioned above, the shield core 2 is attached to the end of the winding 4.
0 to 23, the leakage magnetic flux generated from the winding 4 flows into the nearest shield core disposed at the end of the winding. In addition, the shield core is arranged across the windings of each of the three phases and forms a return path for the leakage magnetic flux, so the leakage magnetic flux for the three phases that has flowed into the inner and outer shield cores cancel each other out. The total sum becomes zero, and the leakage magnetic flux flowing outside becomes zero. Therefore, magnetic flux does not flow into the case that houses the reactor (not shown in Figure 3) or the core fastening metal fittings, reducing stray loss and preventing local overheating in the case or core fastening metal fittings. occurrence is prevented.

Furthermore, since the windings are tightened by the annularly formed shield core, even if the heights of the windings of each of the three phases are slightly uneven, each winding can be adjusted by adjusting the tightening force for each phase winding. can be tightened almost evenly.

Effects of the invention As described above, according to the invention, an annular shield is provided on the inner and outer circumferential sides of the upper core yoke section and the lower core yoke section, respectively, so as to span the windings of each of the three phases. Since the iron core is provided, the leakage magnetic flux generated from the windings of each of the three phases can flow into the shield core and be canceled out.The leakage magnetic flux that has once flowed into the shield core can be prevented from flowing outside, and the case This has the advantage of preventing local overheating and reducing stray loss. In addition, since leakage magnetic flux can be prevented from flowing out from the shield core, it becomes possible to use inexpensive iron bolts as winding tightening bolts.
There is a practical benefit of reducing reactor costs.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing the basic configuration of a three-phase reactor to which the present invention is applied, and Figure 2 is a cross-sectional view taken along line A-A in Figure 1, showing the structure of a conventional reactor. 3 is a cross-sectional view taken along the line A--A in FIG. 1, showing the structure of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Upper core yoke part, 2... Lower core yoke part, 3... Core leg part, 4... Winding wire, 7... Upper core tightening fitting, 8... Lower iron core tightening fitting, 20 ……
Upper inner shield core, 21... Upper outer shield core, 22... Lower inner shield core, 23...
...Lower outer shield core, 32, 33... Winding support metal fittings, 34, 35... Winding tightening bolt.

Claims (1)

[Scope of utility model registration request] an annular upper core yoke portion and a lower core yoke portion;
In a three-phase reactor configured by a core leg portion of each of the three phases disposed across the two core yoke portions, and a winding wound around each of the core leg portions,
An annular upper inner shield core and an upper outer shield core disposed on the inner and outer peripheral sides of the upper core yoke portion so as to straddle the upper ends of the windings of each of the three phases, respectively, and the lower core joint. An annular lower inner shield core and annular upper inner shield core are provided on the inner circumferential side and the outer circumferential side of the iron part, respectively, and are arranged so as to straddle the lower ends of the windings of the three phases. A three-phase reactor characterized in that the windings are tightened and fixed in the axial direction via each of the shield cores.