CN201532843U

CN201532843U - Transformer with segmental structure

Info

Publication number: CN201532843U
Application number: CN2009203070477U
Authority: CN
Inventors: 江惠贞
Original assignee: Fuzhou Tianyu Electric Co Ltd
Current assignee: Fuzhou Tianyu Electric Co Ltd
Priority date: 2009-07-29
Filing date: 2009-07-29
Publication date: 2010-07-21
Anticipated expiration: 2019-07-29

Abstract

The utility model relates to a transformer with a segmental structure, which comprises a high-voltage coil winding and a low-voltage coil winding which are spirally wound outside an iron core, and is characterized in that two ends of the upper half section of the high-voltage coil winding is respectively provided with a pair of taps; the lower half section thereof is also provided with a pair of taps; the winding direction of the upper half section of the coil winding is opposite to that of the lower half section of the coil winding, and the numbers of turns are the same; and the tap at the tail end of the upper half section is connected with the tap at the beginning end of the lower half section. The transformer with the segmental structure can effectively solves the problems of reducing the interlayer voltage of the coil windings of the transformer, and reducing the influence of interlayer voltage on internal material of the transformer, thus improving the working stability of the transformer.

Description

Segmented layered structure transformer

Technical field

The utility model relates to a kind of segmented layered structure transformer, is applied to 35KV level electric power system.

Background technology

Transformer 35kV level electric power system is used connection Yyn0 always, and this connection can cause that output current is asymmetric under secondary side asymmetric load situation, thereby primary side produces the neutral point drift.Therefore answer the power supply department requirement, having produced 35kV level connection is the design of Dyn11.The conventional design that 35kV level high-tension coil D connects is common layered structure, because the phase voltage height that every phase coil bears, the number of turn is many, thereby produces very high interlayer operating voltage.Transformer wet goods dielectric is under the too high interlayer operating voltage for a long time, and ageing of insulation takes place easily, and transformer oil decomposes problems such as producing gas and partial discharge.Therefore, how addressing the above problem is the object of the utility model research.

Summary of the invention

The utility model relates to a kind of segmented layered structure transformer, and purpose is to design a kind of transformer device structure that can reduce transformer interlayer operating voltage.

Technical solutions of the utility model are achieved in that a kind of segmented layered structure transformer, comprise the spiral helicine high-tension coil winding and the low-voltage coil winding that are wrapped in the iron core periphery, it is characterized in that: the two ends of described high-tension coil winding upper semisection respectively are provided with a pair of tap, lower semisection also is provided with a pair of tap, upper semisection coil windings and lower semisection coil windings are around to opposite, the number of turn is identical, and the terminal tap of upper semisection is connected with the tap of lower semisection top.

The utility model can effectively solve the voltage between layers that reduces transformer coli winding, reduces the influence of voltage between layers to the transformer internal material, thereby has improved the job stability of transformer.

Description of drawings

Fig. 1 is segmented layered structure transformer basic principle figure

Fig. 2 is a segmented layered structure transformer high-tension coil structure chart

Fig. 3 is a segmented layered structure transformer high-tension coil lower semisection tap clamping sketch

Fig. 4 is a segmented layered structure transformer high-voltage coil insulation spare structure diagram (1)

Fig. 5 is a segmented layered structure transformer high-voltage coil insulation spare structure diagram (2)

Embodiment

With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, a kind of segmented layered structure transformer comprises the spiral helicine high-tension coil winding and the low-voltage coil winding that are wrapped in the iron core periphery, and the two ends of described high-tension coil winding upper semisection respectively are provided with a pair of tap, lower semisection also is provided with a pair of tap, upper semisection coil windings and lower semisection coil windings are around to opposite, and the number of turn is identical, and the terminal tap of upper semisection is connected with the tap of lower semisection top.

The latter half of described high-tension coil winding upper semisection is provided with some terminal taps, by middle part tap changer and the corresponding connection of some tops tap that the first half of lower semisection is provided with, is beneficial to reduce the interlayer operating voltage of coil windings.

Illustrate that according to Fig. 2 there are following characteristics in this novel high-pressure loop construction:

Main empty path A1 is followed successively by from inside to outside: item is 6. cardboard+item 8. 9. corrugation oil duct of cardboard+item of oil duct+item that 7. insulate of corrugation oil duct+item 5., and the A1 minimum value is 20mm.

High-tension coil is followed successively by from top to bottom apart from core end insulation H1: core insulation+item 4. paper circle+item 3. square ring+item 2. insulating end ring+item 1. hold insulation, the h1 minimum value is 35mm.

Middle part insulation H2 is for being followed successively by from top to bottom: 10. item 10. end insulation+item ⑾ insulating end ring+item ⑿ square ring+item ⑿ square ring+item ⑾ insulating end ring+item holds insulation, and the H2 minimum value is 41mm.

Because high-tension coil does not highly have ampere-turn at H2, causes along coil height ampere-turn skewness, produce horizontal stray field and relevant additional impedance thus, should revise short-circuit impedance during the design high-tension coil.

Whole high-tension coil is without electrostatic shielding, and the employing square ring improves electric field, improves dielectric strength.

High-tension coil is the 35kV level, and D connects, and wire insulation is 0.45mm;

High-tension coil is a segmented layered structure, and the two parts that are divided into are arranged above and below vertically, two parts insulation system symmetry up and down, but around on the contrary.

Layer insulation: choose by the interlayer operating voltage, and will suitably strengthen;

Axial oil road size and quantity are calculated to determine it by temperature rise;

Two parts distribute at the total number of turns and the number of turn up and down, oil duct size, quantity and placement location, and choosing of layer insulation is all identical.

The

shunting tap

2,4,6 of the first half is drawn for radial at outermost layer; The

shunting tap

3,5,7 of Lower Half is at innermost layer, for axially drawing.

The coil tap 3,5,7 of high-tension coil the latter half needs to grip with wire clamp when the lead-in wire assembling, sees Fig. 3 for details.

High-voltage coil insulation spare structure has novelty: item is insulating end ring 2., adopts paper circle both sides to paste different length and width cushion block, sees Fig. 4 for details.The item oil duct that 7. insulate: two ends and middle part otch see Fig. 5 for details to place square ring.

High-voltage coil and low-voltage coil cover winding technologe, the maximum characteristics of coiling high-tension coil are: by two parts up and down simultaneously around, its coiling is in proper order: load onto low-voltage coil that high-tension coil winding former Zhao will wind and be fixed on the accurate position of high-tension coil winding former Zhao and load onto 5. corrugation oil duct of item successively by the high-tension coil structure chart on coil winding machine, item is cardboard 6., 7. item insulate the oil duct Zhao in the definite item of half the place's line ⑿ of whole high-tension coil height square ring position, simultaneously first-class ⑿ square ring of two parts up and down, ⑾ insulating end ring Zhao up and down two parts re-lay simultaneously item 9. corrugation oil duct Zhao up and down two parts fixed respectively around head, (4. 3. item 2. item temporarily do not loaded onto in winding process, when the device body assembles, refill and join item 2. item is 3. 4.), item 2. the item 3. the item 4. the position assemble interim wood block filler, to keep its 2. 3. 4. former having living space of item of item, lay item 1. end insulation Zhao then up and down two parts after the intact regulation number of turn, lay 10. end insulation of item by two ends to middle spaced winding Zhao simultaneously, method according to this behind intact ground floor is around complete high-tension coil.

Claims

1. segmented layered structure transformer, comprise the spiral helicine high-tension coil winding and the low-voltage coil winding that are wrapped in the iron core periphery, it is characterized in that: the two ends of described high-tension coil winding upper semisection respectively are provided with a pair of tap, lower semisection also is provided with a pair of tap, upper semisection coil windings and lower semisection coil windings are around to opposite, the number of turn is identical, and the terminal tap of upper semisection is connected with the tap of lower semisection top.

2. segmented layered structure transformer according to claim 1, it is characterized in that: the latter half of described high-tension coil winding upper semisection is provided with some terminal taps, by middle part tap changer and the corresponding connection of some tops tap that the first half of lower semisection is provided with, be beneficial to reduce the interlayer operating voltage of coil windings.