CN1253365A

CN1253365A - Technology for manufacturing dry-type three-phase transformer with flame-retarding paper

Info

Publication number: CN1253365A
Application number: CN 99124508
Authority: CN
Inventors: 赵志恒; 赵国连
Original assignee: TRANSFORMER CO Ltd OF TIANWEI GROUP BAODING
Current assignee: TRANSFORMER CO Ltd OF TIANWEI GROUP BAODING
Priority date: 1999-11-10
Filing date: 1999-11-10
Publication date: 2000-05-17

Abstract

A dry-type three-phase transformer features that the flame retarding paper whose insulating class is higher than F is used when low-voltage winding is wound, the wound transformer is immersed in non-solvent impregnating varmish for impregnation under vacuum condition, then after baked, it is finished, and elastic silicon rubber is used for vibration damping. Its advantages are high insulation performance, high safety, low noise, small size, low cost, and no environmental pollution.

Description

Technology for manufacturing dry-type three-phase transformer with flame-retarding paper

The present invention relates to the transformer technology field.

Capacity in the past is 30-630 kilovolt-ampere a transformer, low-voltage coil is that laminar or paper tinsel are around formula, the material of using between Copper Foil is insulated wire (brown paper), and is oil immersed type, and not only volume is big for this transformer, complex structure, easy to leak oil, contaminated environment, noise is big, and insulation property are poor, inflammable, dangerous.The transformer that capacity is bigger (more than 630 kilovolt-amperes) low-voltage coil adopts spiral, and insulating material is still used general insulating paper (brown paper) during coiling, after transformer is made, coats with lacquer impregnation process at normal temperatures and pressures.It is poor that this class transformer also exists insulation property, the loss height, and noise is big, short-life defective.

The purpose of this invention is to provide a kind of technology for manufacturing dry-type three-phase transformer with flame-retarding paper, its technology is reasonable, has good insulation preformance with its transformer of making, and safe in utilization, loss is low, and is fire-retardant, and overload capacity is strong, and low office puts, durable characteristics.

The present invention is achieved in that a kind of technology for manufacturing dry-type three-phase transformer with flame-retarding paper, comprise the manufacturing iron core, it is characterized in that it is the above fire retardant papers coiling of F level that inner low-voltage coil and external high pressure coil all adopt the class of insulation, behind the transformer coil coiled, coil integral body or high and low pressure coil are put into vacuum tank respectively, vacuumize, and carry out the pressure dipping lacquer, it is the above solvent-free immersion paint of F level that lacquer adopts the class of insulation, and oven dry is at last made.

Fire-retardant for guaranteeing safety, good insulating, it is that the above fire retardant papers of F level is good that the crust of high pressure or the used lead of low-voltage coil all is surrounded by the class of insulation.

Between the yoke and coil of iron core, between iron core and folder, between yoke and folder, or preferably be provided with resistant to elevated temperatures elastic silicone rubber pad between strutting piece and coil,, reduce noise to strengthen damping property.

The dry-type three-phase transformer that adopts above-mentioned manufacturing process to make, its structure can be inner low-voltage coil be Copper Foil around the formula structure, outside high-tension coil is a layered structure.Perhaps for inner low-voltage coil is multilayer architecture, spiral cake formula structural formula, connects the cake formula structure of twining, high-tension coil is a multilayer architecture.

Advantage of the present invention is: technology is reasonable, with the transformer that this technology is made, has good insulation preformance, loss is low, safety is fire-retardant, overload capacity is strong, low dry sound, low office are put, advantage such as durable.Around the formula transformer, it is little also to have a volume with its paper tinsel of making, no oil impregnate problem, advantage such as simple in structure, cost is low, and applicability is good.

Below in conjunction with embodiment and accompanying drawing the present invention is described further, but not as a limitation of the invention.

Embodiment 1: manufacturing process

Iron core, folder can be taked the common process manufacturing.Iron core can adopt magnetic conduction grain orientation cold rolling electric band, complete tiltedly atresia colligation, the built-in plate structure of hitting.High-tension coil can directly twine or be the sleeve assembled.Its low-voltage coil winding can be paper tinsel around formula, laminar or cake formula structure.Paper tinsel insulating material around between the formula Copper Foil uses the fire retardant papers of the class of insulation as the F level, for example adopts NOMEX fire retardant papers (company of U.S. Du group produces) performance preferable.But twine after laminar or this kind of the cake formula structure lead outsourcing fire retardant papers, have high-insulativity and anti-flammability.After high and low coil of transformer or integral manufacturing are intact, put into vacuum tank, vacuumize, adopting the class of insulation is the above solvent-free immersion paint impregnating by pressure of F level, and oven dry is at last made.Bake out temperature is generally 105 ℃ ± 5 ℃ for good.Behind the high and low pressure coil difference dipping lacquer, can assemble, the centre is a gas off-take, and adding the class of insulation is the above insulating stay of F level.

Embodiment 2: the paper tinsel made from above-mentioned technology is around the formula dry-type three-phase transformer.

Fig. 1 is the structural representation (removing cushion block) of this kind transformer.

Fig. 2 is the vertical view of Fig. 1.

Fig. 3 is the partial side view of Fig. 1.

Fig. 4 is its electrical schematic diagram (being provided with cushion block).

Referring to Fig. 1-Fig. 3, iron core 1 adopts high magnetic conduction grain orientation cold rolling electric band, and complete tiltedly atresia is tied up The hole, built-in control pulling plate structure; 9 is low pressure Copper Foil winding, accompanies the fire-retardant folder of NOMEX between Copper Foil Layer; 2 is the external high pressure coil, and its lead exoperidium is the NOMEX fire retardant papers, the cooling between two coil Be lined with NOMEX fire retardant papers insulating stay in the air flue 11; 3 is low pressure copper coin binding post, 3; 12 is high-voltage connection terminal (for the copper rod of tape insulation), 3; 4 is thermal detector; Iron core 1 end Yoke gripped by folder 6, folder 6 ends are provided with support member 7; Between yoke and coil, yoke and 6 of folders, or be lined with high temperature elastic silicone rubber pad 8 between support member and coil, to strengthen damping performance, make an uproar Sound is low; Also have vacuum pressure impregnation protective layer 10 between coil surface and space, lacquer can be selected insulation etc. Level is the above solvent-free immersion paint of F level; The external high pressure coil can directly be wrapped on the low-voltage coil, or in Between establish air flue, also can twine separately, be assemblied on the low-voltage coil; 5 are dolly (also can not establishing). This kind The paper tinsel of structure has saved oil cooling device in the past around the formula transformer, and effect is very good. The high pressure winding also can adopt The class of insulation is that the above enamel-covered wire of F level twines, and interlayer adds above-mentioned fire retardant papers structure.

Among Fig. 4, A, B, C are high voltage winding winding terminal, and X, Y, Z are low pressure winding connection post,

Tap

1 and 1,2 and 2,3 can link to each other respectively with 3.

Claims

1, a kind of technology for manufacturing dry-type three-phase transformer with flame-retarding paper, comprise the manufacturing iron core, it is characterized in that it is the above fire retardant papers coiling of F level that inner low-voltage coil and external high pressure coil all adopt the class of insulation, behind the transformer coil coiled, coil integral body or high and low pressure coil are put into vacuum tank respectively, vacuumize, and carry out the pressure dipping lacquer, it is the above solvent-free immersion paint of F level that lacquer adopts the class of insulation, and oven dry is at last made.

2, transformer manufacturing process according to claim 1 is characterized in that fire retardant papers is the NOMEX fire retardant papers.

3, it is the above fire retardant papers of F level that transformer manufacturing process according to claim 1, the crust that it is characterized in that high pressure or the used lead of low-voltage coil are surrounded by the class of insulation.

4, according to claim 1,2 or 3 described transformer manufacturing process, it is characterized in that between the yoke and coil of iron core, between iron core and folder, between yoke and folder, or be provided with resistant to elevated temperatures elastic silicone rubber pad between strutting piece and coil.

5, a kind of dry-type three-phase transformer that adopts the described manufacturing process of right 1,2,3 or 4 to make, it is characterized in that inner low-voltage coil be Copper Foil around the formula structure, outside high-tension coil is a layered structure.

6, a kind of dry-type three-phase transformer that adopts right 1,2,3 or 4 described manufacturing process to make is characterized in that inner low-voltage coil is multilayer architecture, spiral cake formula structure or continuous cake formula structure of twining, and high-tension coil is a multilayer architecture.