JPS5966012A - Method of connecting condenser type molded insulated cylind-er - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for connecting a plurality of insulating cylinders, and particularly to a method for connecting capacitor-type molded insulating cylinders.

[Technical background of the invention]

A capacitor-shaped molded insulating tube that insulates a conductor to which high voltage is applied is generally made of an insulator such as kraft paper or polyester, and aluminum foil or 7.
'J=A conductor such as electric paper is wound alternately to form several concentric cylindrical layers of the same potential surface, and the electric field strength distribution in the radial direction i 3! ,l! 11 to increase the voltage on the insulation side. .

In addition, J? It is impregnated with a resin to improve the mechanical strength of the capacitor-shaped molded insulating cylinder.

Therefore, when such capacitor-shaped molded insulating tubes are connected to each other, the connections must be made so that there are 41 mechanical and electrical weak points at the connecting portions.

The conventional method of connecting a capacitor type molded insulating tube is as follows.
H7i U:21 As shown in FIG. each i/+M surface 2a, 2b'ff
: Connection is made using a metal fitting 1'jII pipe 3.

In other words, even if the lit self-connecting tube 3 made by @genus is iJ'
As a metal H material, aluminum has a relatively high coefficient of linear expansion and is molded in a gJj type. The inner circumferential surface 4 of the connecting pipe 3 is formed by molding the capacitor type H, cylinder I n +
Each end of 1-b rfi! 2 a, 2 b, each outer periphery 1 bacteria, 5 a, 5 b are J-ii self-circular inner peripheral surface 4
The finishing points are machined to meet a predetermined C'' mating tolerance between the two. Part 1. So, the inner circumferential surface 4 of the connecting pipe 3
and polishing stove 1. / After applying adhesive to each of the 9Ha surfaces 2a and 2b, each of the above capacitor type molded insulating tubes 1 is attached.
Each '/'l' having the above-mentioned end faces 2a, 2bf of g, Ib
:Broadcast゛'] 1~ to the above song continuation tube 3 (1111 to 1
Enter f41 and place M9Ii6 on -! self-l 2 a
, 2 b ' −, h M self tangent IF
'R,9's 1)) JMJ i7i'i 4
They are joined at the center position 1i'r.

There is also a connection method using flanges and bolts, as shown in FIG. 1(b).

That is, for each capacitor-type molded insulating tube la, Ib, each end surface 2a, 2b and each outer circumferential surface near each end surface 2a, 2b are carefully measured, and the inner diameter of the capacitor-type molded insulating tube 7a, lb is 7 cylindrical aluminum langes 6a, 6bf equal to: Attach with adhesive.

Next, the seven flange 5a, 6b are tightened and fixed using bolts 7 arranged at a plurality of positions on the entire circumference of the seven flange 5a, 6b.

[Problems with background technology]

However, the connection method of the capacitor type molded insulating tube as described above has the following problems.

In other words, the linear expansion coefficient of JarlbO, a capacitor-shaped molded insulating cylinder impregnated with synthetic resin such as epoxy resin, is
Even compared to the net expansion rate of aluminum, which is relatively large for a metal side slope, the life expectancy is significantly large. Therefore, when the temperature of the connection between the capacitor-type molded insulating tubes 1a and Ib changes completely, stress is generated in the connection due to the difference in coefficient of linear expansion. The value of this stress is J')j%'1 agent ty)
No. 1 in terms of strength (that is, h1.1 of the 11 layers of contact
1 white 14” - Comp.

Fluid-shaped mold insulation fii) Outer peripheral surface 5 a of Jul J b.

, between rib b, flange 6 FL, 6 h and each node 1
Page 1 2a.

Beveling/paralyzing soil 11 with 2b (2 flanges 6a, 6
13 and each of the outer peripheries nll 5 h and 5 b, a peeling phenomenon occurs.

So, above 1. Self name Konbunza type mold insulation tai) 7R
+ 1b Upper W, u+:, Pipe 3, Flange 5a.

6b may be damaged, and the reliability of the connection may be reduced.

! In order to lower the pressure of the joint 88d1 and h; and to completely prevent voids from forming at the joint, vacuum 7)? The extra work involved in handling the pump pair equipment also increases manufacturing costs.

For the problem described in ``U31'', the method of passing once is to form thick molded insulation 1'S11 & 11b and increase the M1 product of end faces 2a and 2b [7, electric field distribution. Connecting pipe 3, flanges 6a, 6 to avoid concentration
There is a method of reducing the influence of the voids by forming each corner of b to be rounded. However, in the method described in item 1, the capacitor-type molded insulating tubes 1 a , 1 b
And the connecting pipe 3.7 The flange 6a, 6b becomes larger, and as a result, the capacitor type mold insulation 'f't) 1 ae 1
b k The whole Do5ki device used is likely to become larger i7
- There was also 0 [Object of the invention] The present invention was made in response to such a small 'l'i'f, and its purpose is to
It is an object of the present invention to provide a complete method for contacting a capacitor-type molded insulating tube, which can improve reliability in an additional process and also reduce the size of the condenser-type molded insulating tube itself.

[Summary of the invention]

In order to achieve the above object, in the capacitor type molded insulation connection method of the present invention, the insulator and the conductor are wound around each other in a small circle and impregnated with resin. By forming a wound layer of non-metallic fiber fabric impregnated with resin on the outer peripheral surface of the abutting joint of a pair of capacitor-shaped molded insulating cylinders, the net expansion coefficient of the wound layer can be It is characterized by approximating the pure expansion coefficient of a pair of capacitor-shaped molded insulating cylinders.

[Embodiments of the invention]

FIG. 2 is a cross-sectional view of a connection part for explaining the connection method of a capacitor-type molded insulating tube according to an embodiment of the present invention, and the same parts as in FIG. 1 (-) (b) are the same. It is shown by . Therefore, the explanation of the overlapping parts will be omitted.

In this embodiment, a capacitor type molded insulating tube 1
An annular step 8'fK: is formed along the inner peripheral edge of the end surface 2a of the capacitor type insulating tube 1b, while the end surface 2b of the capacitor-shaped molded insulating cylinder 1b is
An annular protrusion 'A1. that fits into the annular step part 8 with a fitting tolerance along the inner peripheral edge of the annular protrusion 'A1. ! 9 is formed, and the annular projection 9 is fitted into the annular step +%8. Then, as shown in FIG. 3, while impregnating 11 pieces of fabric knitted with glass fiber Htt yarn wound around a roll 10 and a resin 13 such as epoxy that is filled in a tank 12, the capacitor-shaped molded insulating cylinder is 1a, end face 2a of lb.

A winding layer 14 of a constant Jq common to the outer peripheral surfaces 5a, 5b f is formed by winding around the outer peripheral surfaces 5a and 513 near the outer peripheral surfaces 2b, and 4
+'i, J harden fat.

Condenser type mold 9 insulating cylinder I
Q, lb are connected d:, 4iQ is made of the glass fiber woven fabric 11 reinforced with resin 13, and the coefficient of linear expansion of the wound layer 14 is determined by the overlapped insulator and conductor. Capacitor type molded insulating tube J impregnated with xylene resin
The linear expansion coefficients of a and 7b are approximated. therefore,
Even if the connection portion is subject to a large temperature change, the generation of stress due to the difference in coefficient of linear expansion can be suppressed in the connection portion. As a result, the occurrence of the peeling hIF phenomenon between the wound layer 14 and the outer circumferential surfaces 5a, 5b can be suppressed, and as a result, the reliability of the connection portion can be improved.

Further, in this embodiment, since the wound layer 4 is impregnated with resin 13 such as uncured epoxy, this resin 13 fills voids generated in the joint portion to some extent. therefore,
As mentioned above, there is no need for the device to prevent the generation of voids.
9. Make the condenser-type molded insulating cylinder itself particularly thick (
2) Since it is necessary to form the J: 111.1 capacitor type mold insulation nl, i, it is possible to miniaturize it.

It should be noted that the present invention is not limited to the above-mentioned 111 examples of heating power, and 11 woven fabrics forming 14 layers at a time are directly fired with 7-fiber dainer yarn and this glass fiber silk yarn. Nai
In, 71? Liester Satoshi's plastic fiber ff, Ii
The above outer periphery is adjusted so that the direction of the upper 11 glass fibers matches the axial direction of the multi-molded insulation I) la and Ib. Surface 5a.

At 5h, turn L7 to the right and turn the layer FK': Turn layer 134: Form 7.

Jin's first game I'rl/? 2 & J, , the above-mentioned fruit (in one example, it is possible to obtain the same 4'tf? effect, and the powder 11 has a characteristic of 4.21'ifi).
By using this, the reliability of the contact H1 portion can be improved compared to gold.

In other words, by using glass fiber silk thread in the direction of the stitches, the mechanical strength and tensile strength in the axial direction of the connection part are increased, and by using plastic fiber thread in the circumferential direction, the winding is increased. The coefficient of linear expansion in the circumferential direction of the layer 14 is made close to the coefficient of linear expansion in the circumferential direction of the capacitor-shaped molded insulating cylinder. For example, d: According to the inventors' estimates, the net expansion coefficient in the circumferential direction of the capacitor-shaped molded insulating cylinder: 50X1 (1-', the coefficient of linear expansion in the circumferential direction of the wound layer is 40 to 50X1.
It was possible to approximate it by 0'j. As a result, the aluminum connection% 43, also U'' Norange 6a.

Compared to the conventional method using 6b'4, the stress generated in 2 due to the difference in net expansion coefficient can be suppressed to 1/4 to 1/6.

Next, in order to confirm the effects of the present invention, on the external surface of a capacitor-shaped molded insulating tube with an outer diameter of 500 mm, a wound layer (1) using a fabric made only of glass fiber threads and a layer made of glass fiber threads and plastic. (2) All of the aluminum connecting pipes shown in Figure 1 (,) were installed in the manner described above, and all the thermal tests were carried out, and the above outer periphery was We investigated the occurrence of repeated fatigue caused by thermal stress at the bonding interface with +f+i.The results are shown in the table below.゛The joint J'M section connected using the 1-method has clearly superior surface 1 peelability against a 71 degree change compared to the conventional connection section connected using aluminum connecting pipes. ing.

〔Effect of the invention〕

- Upper liquid 1 As mentioned above, according to the present invention, on the outer peripheral surface of the butt joint of the condenser type molded insulating cylinder,
Combine all the non-metallic woven yarns such as glass fiber light weight or plastic fiber yarns in a 31'1 single block, knit them together, and roll them while dipping the object with resin. Therefore, the linear expansion coefficient of the above-mentioned wound layer is '!'. By easily approximating the coefficient of linear expansion of the molded insulating tube in the form of a diagonal mold, the generation of stress due to temperature change 114 can be suppressed. l
・I can do one thing.

In addition, impregnating agent such as resin of the winding layer may be used to prevent yl? Since the generation of id can be completely suppressed, it is also possible to downsize the capacitor type molded insulating cylinder itself.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) show a conventional method for connecting a condenser type molded insulating tube. FIG. 2 is a cross-sectional view of the connecting portion for explaining one embodiment of the present invention (connecting 141 of a condenser type molded insulating tube according to one example; method), and FIG. 3 is a cross-sectional view of the connecting portion for explaining the method. It is an explanatory diagram for explaining the same method. 1AIIh...container type molded insulating tube, 21'
L, 2h... end face, 3... 9 points, 4...
Inner circumference, 5 +1.5 + - outer circumference, 6 a, 6
b-flange,? ...l? Root, 8...Current step, 9...Jp-shaped protrusion, 10...Roll, 1)...
Fabric, 12...Tank, 13...Resin, 14...
Wound layer. 1111 (i+“one agent Rishiki Suzue Takeshi
Hiko Figure 1 (a) (b)

Claims (2)

[Claims] (1) An insulator and a conductor are alternately wound concentrically to form a cylinder, and a pair of capacitor-shaped insulating cylinders made by impregnating this cylinder with resin are tied together in the i1'l11 direction. In the method for connecting capacitor-shaped molded insulating tubes, a wound layer of non-metallic fiber fabric impregnated with resin is entirely formed on the outer peripheral surface of the abutting joint of the pair of capacitor-shaped molded insulating tubes. All features of condensation
How to connect a sea-shaped molded insulation tube. (2) The woven fabric has the following characteristics in the axial direction: 17 rows of glass R braided threads, and 16 rows of glass R braided threads, and 2 threads of 2 threads, M (threads). 4
2. A method for connecting a capacitor-type molded insulating tube as set forth in claim (1).