阅读说明：本技术 一种750kV变压器出线装置及安装工艺方法 (750kV transformer outgoing line device and installation process method ) 是由 张晓阳 丁立国 柴孟东 丁守涛 于 2021-01-13 设计创作，主要内容包括：本发明涉及一种750kV变压器出线装置,所述的出线装置为新型直出式结构,新型直出式出线装置布置在变压器油箱的内部,位于变压器主柱与变压器旁柱组成的三角空间位置；新型直出式出线装置包括：位于内部的均压球和均压管,均压球和均压管内设置有引线,均压管与高压线圈外表面连接,均压球与高压套管连接。本发明还涉及一种750kV变压器出线装置安装工艺方法,对高压套管均压球周围电场的验证,保证设计裕度,设计一种体积小、绝缘强度高的新型直出式出线装置。本发明充分利用变压器内部主柱与旁柱间的三角空间,减小了油箱尺寸及变压器重量,降低原材料的使用,节约成本,提高产品经济效益。改变高压套管位置,方便接线,减少安装工时。(The invention relates to a wire outlet device of a 750kV transformer, which is of a novel direct-out type structure, wherein the novel direct-out type wire outlet device is arranged inside an oil tank of the transformer and is positioned at a triangular space position formed by a main column of the transformer and a side column of the transformer; novel straight-out device of being qualified for next round of competitions includes: the voltage-sharing device comprises a voltage-sharing ball and a voltage-sharing tube which are arranged inside, wherein leads are arranged in the voltage-sharing ball and the voltage-sharing tube, the voltage-sharing tube is connected with the outer surface of the high-voltage coil, and the voltage-sharing ball is connected with the high-voltage sleeve. The invention also relates to an installation process method of the wire outlet device of the 750kV transformer, which is used for verifying the electric field around the voltage-sharing ball of the high-voltage bushing and ensuring the design margin, and designs a novel direct-outlet wire outlet device with small volume and high insulation strength. The invention fully utilizes the triangular space between the main column and the side column in the transformer, reduces the size of the oil tank and the weight of the transformer, reduces the use of raw materials, saves the cost and improves the economic benefit of products. The position of the high-voltage bushing is changed, wiring is convenient, and the installation time is reduced.)

1. The outgoing device of the 750kV transformer is characterized in that the outgoing device is of a novel direct-out type structure, and a novel direct-out type outgoing device (15) is arranged inside a transformer oil tank (4) and is located in a triangular space position formed by a transformer main column (16) and a transformer side column (17); the novel straight-out outlet device (15) comprises: the voltage-sharing structure comprises a voltage-sharing ball (6) and a voltage-sharing tube (13) which are located inside, wherein a lead (8) is arranged in the voltage-sharing ball (6) and the voltage-sharing tube (13), and the voltage-sharing ball (6) is connected with the voltage-sharing tube (13) and then is connected with the lead (8) through an equipotential line.

2. The outgoing device of the 750kV transformer as claimed in claim 1, wherein one end of the lead (8) is connected to a terminal of the high-voltage bushing (5) inside the voltage-sharing ball (6), and the other end is connected to an outgoing end of the high-voltage coil.

3. The outgoing device of a 750kV transformer as claimed in claim 2, wherein a multi-layer insulating cylinder (7) is arranged outside the voltage-sharing ball (6).

4. The outgoing line device of the 750kV transformer according to claim 2, wherein a corrugated paper board (9), a first insulating bent pipe (10) and a second insulating bent pipe (12) are sequentially arranged on the outer side of the voltage-sharing pipe (13) from inside to outside, and the first insulating bent pipe (10) and the second insulating bent pipe (12) are fixed through a stay and a clamping board (11).

5. An installation process method of a wire outlet device of a 750kV transformer, which is characterized in that the wire outlet device according to any one of claims 1 to 4 is applied, and comprises the following steps:

step 1, verifying an electric field around a high-voltage bushing voltage-sharing ball, ensuring design margin, and designing a novel direct-out type wire outlet device with small volume and high insulation strength;

step 2, designing a specific structure of the novel straight-out type wire outlet device;

and 3, connecting a voltage-sharing pipe with the outer surface of the high-voltage coil, connecting a voltage-sharing ball with a high-voltage sleeve, and installing the novel direct-out type wire outlet device at a triangular space position formed by a main transformer column and a side transformer column inside the transformer oil tank.

6. The installation process method of the 750kV transformer outlet device, according to claim 5, characterized in that the novel straight-out outlet device designed in step 2 comprises: the voltage-sharing ball and the voltage-sharing tube are internally provided with a lead, and the lead is connected with a high-voltage sleeve on the upper part of the voltage-sharing ball; the outside of pressure-equalizing ball sets up the insulating section of thick bamboo of multilayer, and the outside of pressure-equalizing pipe is from interior to exterior sets gradually corrugated paper board, first insulation return bend, the insulating return bend of second, and it is fixed through stay and cardboard between first insulation return bend and the insulating return bend of second.

Technical Field

The invention belongs to the technical field of transformer production and manufacturing, and particularly relates to a novel 750kV transformer wire outlet device and an installation process method.

Background

The high-capacity high-voltage transformer is becoming a product model which is researched and developed by each manufacturer more and more. With the increase of overseas orders of companies, market competition is becoming more and more intense, and manufacturers strive to improve product performance and reduce manufacturing cost to obtain larger profit margins. Therefore, on the premise of ensuring technical parameters, the design structure is optimized, the use amount of transformer oil and steel is reduced, the transportation and installation sizes of the transformer are reduced, and the economical efficiency of the 750kV transformer is inevitably improved.

In the current high-voltage class alternating-current transformer, the traditional L-shaped trunk-type wire outlet device is mostly adopted for connecting the wire from the coil to the sleeve voltage-sharing ball part. As shown in fig. 1, which is a schematic diagram of an existing 750kV transformer outlet device, an outlet device 2 is arranged in an L-shaped trunk 1 at one side of a transformer, the outlet device 2 is located in the L-shaped trunk 1 with a larger volume, the L-shaped trunk 1 is connected with a transformer oil tank 4, and a transformer body 3 is integrally installed in the transformer oil tank 4. The wire outlet device not only consumes a large amount of steel, but also consumes a large amount of manpower and working hours in workshop installation, and also needs to be independently subjected to hot oil circulation, and meanwhile, the cost of the using amount of transformer oil is increased.

Disclosure of Invention

In order to reduce the overall dimension of the transformer as much as possible and reduce the manufacturing cost, the invention designs a novel 750kV transformer wire outlet device and an installation process method. The technical scheme adopted by the invention is as follows:

a wire outlet device of a 750kV transformer is of a novel direct-outlet type structure, is arranged inside an oil tank of the transformer and is positioned in a triangular space formed by a main column of the transformer and a side column of the transformer; novel straight-out device of being qualified for next round of competitions includes: the voltage-sharing coil comprises a voltage-sharing ball and a voltage-sharing tube which are arranged inside, wherein leads are arranged in the voltage-sharing ball and the voltage-sharing tube, the voltage-sharing ball is connected with the leads through equipotential lines after being connected with the voltage-sharing tube, the voltage-sharing tube is connected with the outer surface of the high-voltage coil, and the voltage-sharing ball is connected with the high-voltage sleeve.

The installation process method of the outgoing line device of the 750kV transformer applies the outgoing line device and comprises the following steps:

step 1, verifying an electric field around a high-voltage bushing voltage-sharing ball, ensuring design margin, and designing a novel direct-out type wire outlet device with small volume and high insulation strength;

step 2, designing a specific structure of the novel straight-out type wire outlet device;

and 3, connecting a voltage-sharing pipe with the outer surface of the high-voltage coil, connecting a voltage-sharing ball with a high-voltage sleeve, and installing the novel direct-out type wire outlet device at a triangular space position formed by a main transformer column and a side transformer column inside the transformer oil tank.

The invention has the beneficial effects that:

the invention fully utilizes the triangular space between the main column and the side column in the transformer, changes the traditional L-shaped trunk-type wire outlet device into a direct-out wire outlet device structure, reduces the size of the oil tank and the weight of the transformer, and reduces the transportation weight; the space utilization rate of the oil tank is improved, the volume of the oil tank is effectively reduced, the using amount of transformer oil and steel is reduced, the use amount of raw materials is reduced, the cost is saved, and the economic benefit of the product is improved. The position of the high-voltage bushing is changed, wiring is convenient, and the installation time is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are specific embodiments of the invention, and that other drawings within the scope of the present application can be obtained by those skilled in the art without inventive effort.

FIG. 1 is a schematic diagram of a conventional 750kV transformer outlet device;

fig. 2 is a schematic diagram of a novel 750kV transformer outlet device according to an embodiment of the invention;

fig. 3 is an installation front view of a straight-out outlet device of an embodiment of the present invention;

fig. 4 is an installed sectional view of a straight-out type outlet device according to an embodiment of the present invention;

in the figure: 1-L-shaped trunk, 2-wire outlet device, 3-transformer body, 4-transformer oil tank, 5-high-voltage bushing, 6-voltage equalizing ball, 7-insulating cylinder, 8-lead wire, 9-corrugated paperboard, 10-first insulating bent pipe, 11-stay and clamp plate, 12-second insulating bent pipe, 13-voltage equalizing pipe, 14-high-voltage coil outer surface, 15-novel straight-out wire outlet device, 16-transformer main column and 17-transformer side column.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments.

Fig. 2 is a schematic diagram of a structure of a novel 750kV transformer outlet device according to an embodiment of the present invention. A wire outlet device of a 750kV transformer is of a novel direct-out type structure; the novel straight-out outlet device 15 includes: the voltage-sharing coil comprises a voltage-sharing ball 6 and a voltage-sharing tube 13 which are positioned inside, the voltage-sharing ball 6 is connected with the voltage-sharing tube 13 and then is connected with a lead 8 by an equipotential line, the voltage-sharing tube 13 is connected with an outer surface 14 of the high-voltage coil, and the voltage-sharing ball 6 is connected with the high-voltage sleeve 5. And a lead 8 is arranged in the voltage-sharing ball 6 and the voltage-sharing tube 13, one end of the lead 8 is connected with a wiring terminal of the high-voltage bushing 5 in the voltage-sharing ball 6, and the other end of the lead is connected with a high-voltage coil outlet. The structure can effectively shield the included angle and improve the electric field distribution around the lead 8.

The multilayer insulation cylinder 7 is arranged on the outer side of the pressure equalizing ball 6, the corrugated paper board 9, the first insulation bent pipe 10 and the second insulation bent pipe 12 are sequentially arranged on the outer side of the pressure equalizing pipe 13 from inside to outside, and the first insulation bent pipe 10 and the second insulation bent pipe 12 are fixed through a stay and a clamping board 11. The structure can integrally form a small oil gap of the thin paper tube, improve the insulating strength of unit distance and effectively reduce the insulating distance.

Fig. 3 is a front view of the straight-out outlet device according to the embodiment of the present invention; fig. 4 is a sectional view showing the installation of the straight-out type outlet device according to the embodiment of the present invention. The novel straight-out type outlet device 15 is arranged inside the transformer oil tank 4 and is located in a triangular space position formed by a transformer main column 16 and a transformer side column 17. The invention fully utilizes the triangular space formed by the main column 16 and the side column 17 of the transformer, and the position of the novel direct-out outlet device 15 is moved to the oil tank of the transformer body from the inside of the L-shaped elephant nose at one side of the traditional transformer, thereby saving the larger L-shaped elephant nose and saving a large amount of steel; and the workshop installation saves a large amount of manpower and man-hour, saves the process of hot oil circulation alone, has still reduced the cost of transformer oil use amount, and manufacturing cost greatly reduced has generally reduced transformer transportation size simultaneously, has solved the long-distance transportation size and has restricted scheduling problem.

An installation process method of a 750kV transformer outgoing line device comprises the following steps:

step 1, verifying an electric field around a high-voltage bushing voltage-sharing ball, ensuring design margin, and designing a novel direct-out type wire outlet device with small volume and high insulation strength;

step 2, designing a specific structure of the novel straight-out type wire outlet device, comprising: the voltage-sharing ball and the voltage-sharing tube are internally provided with a lead, and the lead is connected with a high-voltage sleeve on the upper part of the voltage-sharing ball; the outside of pressure-equalizing ball sets up the insulating section of thick bamboo of multilayer, and the outside of pressure-equalizing pipe is from interior to exterior sets gradually corrugated paper board, first insulation return bend, the insulating return bend of second, and it is fixed through stay and cardboard between first insulation return bend and the insulating return bend of second.

The novel straight-out type wire outlet device can shield an included angle and improve the electric field distribution around the lead; the insulating strength of unit distance is improved, and the insulating distance is effectively reduced.

And 3, connecting a voltage-sharing pipe with the outer surface of the high-voltage coil, connecting a voltage-sharing ball with a high-voltage sleeve, and installing the novel direct-out type wire outlet device at a triangular space position formed by a main transformer column and a side transformer column inside the transformer oil tank.

According to the installation method of the novel straight-out type wire outlet device, the triangular space between the main column and the side column is fully utilized, the traditional large L-shaped trunk is omitted, steel is saved, the installation is convenient, the process of independent hot oil circulation is omitted, the manufacturing cost is reduced, and the transportation size is reduced.

Finally, it is to be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, and the scope of the present invention is not limited thereto. Those skilled in the art will understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.