JPH0337220Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to gas-insulated electrical equipment that uses an insulating gas such as SF ₆ as a medium for insulating and cooling the main body of the electrical equipment.

[Prior Art] Gas-insulated electrical equipment is constructed by housing an electrical equipment main body in which multiple layers of electrical equipment windings are wound around an electrical equipment iron core in an electrical equipment case filled with an insulating gas. In conventional gas-insulated electrical equipment of this type, such as gas-insulated transformers, polyester films are used as interlayer insulators of windings to provide insulation between winding conductor layers.

[Problem to be solved by the invention] However, since polyester film is easily charged with static electricity during winding work, there is a risk that it will attract dust and deteriorate the insulation performance of the transformer winding. Therefore, winding work had to be carried out in a clean work environment with dust prevention measures, which inevitably increased the cost of factory equipment.

In addition, when winding the polyester film around the wound conductor layer, the polyester film tends to tear in the width direction, requiring careful handling, resulting in the problem of taking too much time.

Furthermore, since the polyester film has a small coefficient of friction with the winding conductor, the film may fly out in the direction of the winding axis of the winding conductor, ride on the wound conductor, or cause damage between the layers of the winding. Since the wires are easily misaligned, there are problems such as the winding conductor being deflected by electromagnetic mechanical force during a short circuit.

It has been proposed to locally apply a thermosetting resin to the surface of a polyester film to prevent the film from slipping. However, since the mechanical strength of the film is hardly improved even when an adhesive is applied to the film, the problem of the film being easily torn when it is wound around a wound conductor layer cannot be solved.

In addition, when adhesive is applied directly to the polyester film, there is no slippage between the winding conductor and the polyester film when the winding is wound, so the electromagnetic mechanical force in the event of a short circuit directly applies to the polyester film. A problem arises in that the strong force acts on the film and makes it more likely to tear.

The purpose of the present invention is to provide a gas-insulated electric device that has good workability during winding work, excellent insulation performance, and high strength against electromagnetic mechanical force in the event of a short circuit.

[Means for Solving the Problems] The present invention includes an electrical equipment body in which an electrical equipment winding is wound around an electrical equipment iron core using a plurality of winding conductors, and the electrical equipment main body is housed in an electrical equipment case filled with an insulating gas. This relates to gas-insulated electrical equipment.

In this invention, we use an interlayer insulator made by polymerizing adhesive paper coated with a thermosetting insulating adhesive on both sides of a polyester film. The adhesive applied to each adhesive paper was cured while being interposed between the conductor layers.

The adhesive applied to the adhesive paper and cured connects the winding conductor and the adhesive paper and the adhesive paper and the polyester film.

[Function] As mentioned above, if an interlayer insulator made by polymerizing adhesive paper coated with a thermosetting resin on both sides of a polyester film is used, the interlayer insulator will be applied to the winding layer. Since the insulator does not slip, winding work can be easily performed.

Furthermore, as mentioned above, if the adhesive applied to the adhesive paper is cured to create a structure that connects the winding conductor and the adhesive paper and the adhesive paper and the polyester film, the electromagnetic mechanical force in the event of a short circuit accident can be reduced. This can prevent the winding conductor from protruding in the direction of the winding axis.

Further, since the above interlayer insulator has a structure in which a polyester film is sandwiched between mechanically strong adhesive papers, the strength of the interlayer insulator can be increased compared to the case where a polyester film is used alone. Moreover, the adhesive paper acts as a buffer against the electromagnetic mechanical force during a short circuit and prevents strong force from being applied to the polyester film, increasing its strength against electromagnetic mechanical force and preventing the polyester film from tearing during a short circuit. can solve the problem.

Therefore, according to the present invention, it is possible to obtain a gas-insulated electrical device with excellent electrical performance and high mechanical strength by taking advantage of the properties of the polyester film that exhibits good insulation properties in a gas-insulated state.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 and 2 show an embodiment in which the present invention is applied to a gas insulated transformer, with FIG. 1 being a cross-sectional view of the main parts, and FIG. 2 being a top view. The transformer of this embodiment is an external iron type transformer, in which rectangular first and second winding cores 1 and 2 of the same size and shape are arranged side by side.
A transformer winding 3 is wound across the winding window portions 1a and 2a of both cores.

As shown in FIG. 1, the transformer winding 3 consists of a low voltage winding 4 placed inside and a high voltage winding 5 wound concentrically around the low voltage winding 4 from the outside. , an inner circumferential insulator 6 is provided on the inner circumferential side of the low voltage winding 4,
Further, a main insulator 7 is provided between the low voltage winding 4 and the high voltage winding 5.

The inner circumference insulator 6 is made of an insulator having a structure in which a polyester film is sandwiched between two sheets of adhesive paper, and is wound a predetermined number of times, and the low voltage winding 4 is concentric with the outer circumference of the inner circumference insulator 6. It consists of two low-voltage winding halves 4A and 4B wound around each other. The low-voltage winding halves 4A and 4B include winding conductor layers 41 and 42 formed by winding a rectangular wire a predetermined number of turns, and an interlayer insulator 4.
3, and end insulators 44 and 45 are provided at the ends of the winding conductor layers 41 and 42 in the direction of the winding axis, respectively.
The low voltage winding halves 4A and 4B are arranged concentrically and connected in series to each other via a gas flow gap 8.

A gas circulation gap 9 is formed on the outer peripheral side of the low-voltage winding 4, and a main insulator 7 is provided so as to surround the gap 9. The main insulator 7 has the same structure as the inner insulator 6, and the high voltage winding 5 is wound around the outer periphery of the main insulator 7. The high-voltage winding 5 consists of high-voltage winding halves 5A and 5B that are concentrically wound through an oil pipe 10. Both high-voltage winding halves 5A and 5B are made by winding a conductor with a circular cross section a predetermined number of turns. Formed wire-wound conductor layer 5
1 and 52 are arranged concentrically via an interlayer insulator 53, and end insulators 54 and 55 are arranged at the ends of both winding conductor layers 51 and 52 in the direction of the winding axis. There is. Outer insulators 56 and 57 are provided on the outer periphery of the inner high voltage winding half 5A and the outer periphery of the outer high voltage winding half 5B, respectively, and an inner periphery is provided on the inner periphery of the outer high voltage winding half 5B. An insulator 58 is provided. Outer insulators 56, 57 and inner insulators 58
The same material as the interlayer insulators 43 and 53 is used. Further, insulation between core windings having a U-shaped cross section that covers both end faces in the axial direction of the low-voltage winding 4 and high-voltage winding 5, the outer peripheral surface of the high-voltage winding 5, and the first and second wound cores 1 and 2 is provided. A material 11 is interposed between the first and second cores 1 and 2 and the transformer winding 3, and this core inter-winding insulator 11 strengthens the insulation between the transformer winding and the core. ing.

As shown in the enlarged views of FIGS. 3 and 4, the interlayer insulators 43 and 53 are made of a polyester film 12 with adhesive papers 13 and 13 superposed on both sides. The adhesive paper 13 is made by applying a thermosetting insulating adhesive to both sides of an insulating paper such as kraft paper to bring the adhesive into a semi-cured state (so-called B stage state), and then heating the adhesive paper. The adhesive then cures and becomes bonded to the polymerized neighbor.

By the way, the electrical properties and handling workability of polyester film and adhesive paper as interlayer insulators are compared and shown below.

(a) Insulating performance Polyester film shows high insulating performance in an insulating gas atmosphere, but adhesive paper cannot be expected to have high insulating performance.

(b) Strength during winding work Polyester film can be easily torn if slightly scratched, but adhesive paper is difficult to tear because its fibers are entangled.

(c) Winding workability Polyester film is slippery, so winding work is time-consuming, but adhesive paper is non-slip, making winding work easy.

Further, polyester film wrinkles unless tension is applied, so it takes time to wind the film, but adhesive paper does not wrinkle, so the winding work is easy.

(d) Effects of static electricity Polyester film is easily charged, so it easily attracts dust, etc., but adhesive paper is not easily charged, so it is difficult to attract dust, etc.

(e) Resistance to electromagnetic mechanical force Polyester film has a small coefficient of friction with the winding conductor, so if polyester film is used as the only interlayer insulator, the mechanical strength of the winding will be weakened. On the other hand, adhesive paper has adhesive strength, so
When adhesive paper is used as an interlayer insulator, the mechanical strength of the winding is increased.

(F) Necessity of dipping in varnish If only polyester film is used as interlayer insulation, it is necessary to dip the winding wire in varnish after winding work, but if adhesive paper is used, dipping in varnish is not necessary. .

As mentioned above, polyester film and adhesive paper have advantages and disadvantages as interlayer insulators, but if the polyester film is sandwiched between adhesive papers and used as an interlayer insulator as in the present invention, the advantages of both can be achieved. Taking advantage of this, it is possible to obtain an insulating structure with excellent electrical performance and mechanical performance, and it is also possible to improve workability during winding.

That is, in the present invention, an interlayer insulator consisting of a polyester film sandwiched between adhesive papers is provided on the wound wire conductor layer, and the wire wound conductor is wound on top of it. The winding conductor to be wound does not slip, and the winding work can be easily carried out.

Since the winding conductor is bonded to the adhesive paper by heat treatment after the winding is formed, the winding conductor does not move in the direction of the winding axis of the winding. Therefore, the mechanical strength of the winding against electromagnetic mechanical force can be increased.

In the present invention, since both sides of the polyester film are covered with adhesive paper, dust and the like will not adhere to the polyester film due to static electricity.
Therefore, there is no need to use a clean room for the winding work site, and it is possible to reduce factory equipment costs.

In this invention, the polyester film is sandwiched between adhesive papers, giving the interlayer insulator a suitable degree of hardness, making it easier to place the interlayer insulator over the wound conductor layer. be able to. Further, the polyester film does not wrinkle or tear.

Furthermore, by using adhesive paper, the winding conductor and the adhesive paper can be integrated by heat treatment after the winding work, so there is no need to dip the winding wire in varnish and integrate it after the winding work, reducing the number of man-hours. It is possible to reduce the amount of

In addition, in this invention, since the adhesive applied to the adhesive paper is cured to bond between the winding conductor and the adhesive paper and between the adhesive paper and the polyester film, the winding conductor is This can prevent it from popping out in the direction of the winding axis.

Furthermore, since the interlayer insulator described above has a structure in which a polyester film is sandwiched between mechanically strong adhesive papers, the strength of the interlayer insulator can be increased compared to the case where a polyester film is used alone. Furthermore, the adhesive paper acts as a buffer against the electromagnetic mechanical force during a short circuit and prevents strong force from being applied to the polyester film, increasing its strength against electromagnetic mechanical force and preventing the polyester film from tearing during a short circuit. can solve the problem.

The interlayer insulators 43 and 53 are made by sandwiching a polyester film between adhesive paper coated with an adhesive, and then bringing the adhesive to the B stage and integrating the polyester film and the adhesive paper in advance. Alternatively, adhesive paper and polyester film may be supplied onto the winding conductor layer at the time of winding the winding to form an interlayer insulator in which the polyester film is sandwiched between the adhesive papers.

In the above embodiment, only one layer of the interlayer insulators 43 and 53 were provided between the winding conductor layers 41, 42 and 51, 52, but a plurality of layers may be provided. Further, the number of polyester films 12 for the interlayer insulators 43, 53 is not limited to one, but may be plural.

[Effects of the invention] As described above, according to the invention, since an interlayer insulating material having a structure in which a polyester film is sandwiched between adhesive papers coated with a thermosetting resin is used, each of the polyester film and the adhesive paper is By taking advantage of these advantages, it is possible to obtain gas-insulated electric equipment with high winding insulation performance and high winding strength against electromagnetic mechanical force.

Further, since the work of disposing the interlayer insulator on the winding conductor layer is facilitated, the winding workability can be improved and the manufacturing efficiency of electrical equipment can be increased.

Furthermore, by covering the polyester film with adhesive paper, it is possible to prevent dust from adhering to the interlayer insulation due to static electricity, so there is no need to take expensive dust countermeasures in the winding work area, and high-performance gas-insulated electricity can be used. It has the advantage that the equipment can be manufactured at low cost.

In addition, in this invention, since the adhesive applied to the adhesive paper is cured to bond between the wire-wound conductor and the adhesive paper and between the adhesive paper and the polyester film, the wire-wound conductor is bonded by the electromagnetic mechanical force in the event of a short circuit accident. This can prevent it from popping out in the direction of the winding axis.

Furthermore, since the interlayer insulator described above has a structure in which a polyester film is sandwiched between mechanically strong adhesive papers, the strength of the interlayer insulator can be increased compared to the case where a polyester film is used alone. Moreover, the adhesive paper acts as a buffer against the electromagnetic mechanical force during a short circuit and prevents strong force from being applied to the polyester film, increasing its strength against electromagnetic mechanical force and preventing the polyester film from tearing during a short circuit. can solve the problem.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the main parts of an embodiment of the present invention;
FIG. 2 is a top view of the same embodiment, and FIGS. 3 and 4 are enlarged views of portions A and B in FIG. 1, respectively. 1...First volume core, 2...Second volume core, 3
...Transformer winding, 4...Low voltage winding, 5...High voltage winding, 41, 42, 51, 52... Winding conductor layer, 4
3,53...Interlayer insulator.

Claims (1)

[Scope of Claim for Utility Model Registration] Gas-insulated electrical equipment comprising an electrical equipment body in which an electrical equipment winding is wound around an electrical equipment iron core using a plurality of winding conductors, and the electrical equipment body is housed in an electrical equipment case filled with insulating gas. In this method, an interlayer insulating material formed by polymerizing adhesive paper coated with a thermosetting insulating adhesive on both sides of a polyester film is interposed between the winding conductor layers of the electrical equipment winding, and then attached to each adhesive paper. The applied adhesive is cured, and the wire-wound conductor and the adhesive paper and the adhesive paper and the polyester film are bonded by the adhesive applied to the adhesive paper and cured. Characteristic gas insulated electrical equipment.