CN101295578A

CN101295578A - Sulfur hexafluoride gas insulating transformer

Info

Publication number: CN101295578A
Application number: CNA2008100944099A
Authority: CN
Inventors: 边庆凯; 谢毓城; 李敏; 王奎生; 李素雅
Original assignee: Baoding Tianwei Group Co Ltd
Current assignee: Baoding Tianwei Baobian Electric Co Ltd
Priority date: 2008-04-30
Filing date: 2008-04-30
Publication date: 2008-10-29
Anticipated expiration: 2028-04-30
Also published as: CN101295578B

Abstract

The invention discloses a sulfur hexafluoride gas insulating transformer which includes an iron core, a low voltage loop, a high voltage loop, the upper end insulator of the low voltage loop, the lower end insulator of the low voltage loop, the upper end insulator of the high voltage loop, the lower end insulator of the high voltage loop, the main insulating paper cylinder of the loop and the bar stay of the loop, a loop pressure pad and a splint for a core and winding assembly; the expansion lines of the beginning end and the tail end of the low voltage loop respectively cross the insulators of the upper and the lower ends, and the loop pressure pad and the splint for the core and winding assembly to lead out the core and winding assembly from the two ends of the core and winding assembly; the high voltage loop is divided into an upper path and a lower path in parallel; the high voltage loop is twisted by adopting an inner shielding-continuous mode; a plurality of winding coils at the starting end of 110KV of the high voltage loop adopt double-section screen structures; the expansion lines of the beginning ends of 110KV of the upper half path and the lower half path of the high voltage loop penetrate the core and winding assembly and are led out from the middle part; the expansion lines of the tail ends of the upper half path and the lower half path of the high voltage loop penetrate of the high voltage loop penetrate the insulators of the upper and the lower end parts of the high voltage loop, the loop pressure pad and the splint for the core and winding assembly and lead out the core and winding assembly from the two ends of the core and winding assembly. The localized concentration of the electric field at the end part of the loop of the transducer of the transformer is low; the anti-short circuit ability of the high voltage loop is high; the manufacture is easy; the materials are saved and the cost is low.

Description

SF

One, technical field

The present invention relates to a kind of variable pressure gas device, relate in particular to a kind of 110kV gas-insulated transformer.

Two, background technology

At present, 110kV level high pressure SF6 gas-insulated transformer high pressure all adopts the bind mode of YN, and be the graded insulation structure, be that high pressure head end insulation level is the 110kV level, high pressure neutral point insulation level is 60kV or 40kV level, its High-Voltage Insulation and high-tension coil structure be in the following ways: 1, high-tension coil adopts end inlet wire structure, be that 110kV level high pressure head end is from high coil, draw at following both ends, this structure will inevitably cause high pressure, low-voltage coil end electric field concentration of local, in order to reduce the concentration of local of transformer coil end electric field, the transformer of this structure is at high pressure, static board has all been placed in the end of low-voltage coil, the height height of transformer, volume is big, the cost of manufacture height.What 2, high-tension coil adopted is to be entangled with the formula winding method entirely, though it can satisfy sulphur hexafluoride SF6 gas percussion voltage strength, effectively improving the high-tension coil surge voltage distributes, but transformer for larger capacity (20MVA and more than), the coils from parallel connection of coils radical is many, and soldering tip is many, and the coiling difficulty, quality is difficult for guaranteeing, is unfavorable for improving the transformer anti-short circuit capability.

Three, summary of the invention:

The present invention solves now with the problems referred to above that exist in the technology, provides the concentration of local of a kind of transformer coil end electric field low, and the high-tension coil anti-short circuit capability is strong, makes simply, saves material, the SF that cost is low.

For addressing the above problem, technical solution of the present invention is: a kind of SF, it comprises iron core, low-voltage coil, high-tension coil, low-voltage coil upper end, bottom insulation, high-tension coil upper end, bottom insulation, coil main insulation paper web and stay, coil pressing plate and device body supporting plate; The head of low-voltage coil, terminal lead-out wire pass through its upper end, bottom insulation, coil pressing plate and the device body supporting plate two ends extracting device body from the device body respectively; High-tension coil is divided into upper and lower two-way in parallel, and it adopts the mode coiling of inner shield-continous way, and several line cakes of its 110KV level head end adopt two sections screen structures; The 110KV level head end lead-out wire of its upper and lower two-way passes through the device body, draws from device body middle part, and the terminal lead-out wire of its upper and lower two-way passes through its upper end, bottom insulation, coil pressing plate and the device body supporting plate two ends extracting device body from the device body.

Two sections screen structures that several line cakes of the 110KV level head end of above-mentioned described high-tension coil of the present invention adopt are: insert shielding conductor in several line cakes of 110KV level head end, by the computational analysis of coil wave process, the surge voltage that calculates between the winding wire cake distributes, determine to insert the line cake number of the shielding conductor in the high-tension coil and the insertion depth in every line cake thus, thus several line cakes of coil head end are divided into several screen units, each unit inserts the shielding number of turn of designing requirement, and all the other are continuous segment.

The head end of high-tension coil of the present invention is that 110KV level high-pressure side is drawn from device body middle part, its end that is low-pressure end are drawn from device body two ends, improved SF6 gas-insulated transformer end winding electric field in the prior art, effectively reduce the electric field concentration phenomenon of transformer coil end, reduced because of electric field and concentrated the possibility that causes electrical breakdown, improved the overall performance of transformer.Under the situation of the superperformance that guarantees transformer, cancelled the static board of high pressure, low-voltage coil end, transformer coil, iron core and whole height are effectively reduced, the structure of transformer is compactness more, has saved material, reduced cost of manufacture.High-tension coil adopts the mode coiling of inner shield-continous way, has improved its anti-short circuit capability, has improved the capacitance profile between end winding line cake, and the voltage between the line cake is more evenly distributed, and insulation margin is bigger.Its coil winding does not have soldering tip, and coil winding is easier, has saved man-hour greatly, enhances productivity, mass of coil and operational reliability.

Four, description of drawings

Below in conjunction with accompanying drawing the present invention is further described:

Fig. 1 is the structural representation of device body among the present invention;

Fig. 2 is the structural representation of mesohigh coil of the present invention.

Five, embodiment:

As depicted in figs. 1 and 2, present embodiment comprises iron core 15, low-voltage coil 16, high-tension coil, low-voltage coil upper end, bottom insulation 1,14, high-tension coil upper end, bottom insulation 4,11, coil main insulation paper web 7 and stay 17, coil pressing plate 3 and device body supporting plate 12.The head end lead-out wire 2 of low-voltage coil and terminal lead-out wire 13 pass through its upper end, bottom insulation 1,14, coil pressing plate 3 and the device body supporting plate 12 backs two ends extracting device body from the device body respectively.High-tension coil is divided into upper and lower two-

way

6,9, it is set out on a journey and 6 adopts a left side right around also passing through the device body from the coil middle part to the upper and lower two-way of, high-

tension coil

6,9 is in parallel around adopting to, following road 9, draw 110KV level high-tension coil head end A, B, C lead-out wire 8 is drawn the terminal X of high-tension coil of low voltage grade from the coil two ends, Y, Z lead-out wire and divide wiring to lift one's

head

5,10, thus make the electric pressure at high-tension coil both ends become the electric pressure of high pressure neutral point, improved high-tension coil end electric field.The upper and lower two-

way

6,9 of high-tension coil all adopts the mode coiling of inner shield-continous way, by the computational analysis of coil wave process, 12 line cakes of its 110KV level head end adopt two sections screen structures: 2 line cakes are a screen unit, from head end, preceding 4 line cakes insert 3 circle shielding conductors 19,4 line cakes then insert 2 circle shielding conductors 19, and 4 line cakes following insert 1 circle shielding conductor 19, and all the other are continuous segment 20.18 is the high-tension coil active line.

Claims

1, a kind of SF, it comprises iron core, low-voltage coil, high-tension coil, low-voltage coil upper end, bottom insulation, high-tension coil upper end, bottom insulation, coil main insulation paper web and stay, coil pressing plate and device body supporting plate; The head of low-voltage coil, terminal lead-out wire pass through its upper end, bottom insulation, coil pressing plate and the device body supporting plate two ends extracting device body from the device body respectively; High-tension coil is divided into upper and lower two-way in parallel, it is characterized in that: high-tension coil adopts the mode coiling of inner shield-continous way, and several line cakes of its 110KV level head end adopt two sections screen structures; The 110KV level head end lead-out wire of its upper and lower two-way passes through the device body, draws from device body middle part, and the terminal lead-out wire of its upper and lower two-way passes through its upper end, bottom insulation, coil pressing plate and the device body supporting plate two ends extracting device body from the device body.

2, SF according to claim 1, it is characterized in that: two sections screen structures that several line cakes of the 110KV level head end of described high-tension coil adopt are: insert shielding conductor (19) in several line cakes of 110KV level head end, by the computational analysis of coil wave process, the surge voltage that calculates between the winding wire cake distributes, determine to insert the line cake number of the shielding conductor (19) in the high-tension coil and the insertion depth in every line cake thus, thus several line cakes of coil head end are divided into several screen units, each unit inserts the shielding number of turn of designing requirement, and all the other are continuous segment.