CN2622823Y

CN2622823Y - Loop three-phase cable winding transformer

Info

Publication number: CN2622823Y
Application number: CN 03227753
Authority: CN
Inventors: 刘军; 党艳阳; 杜新梅; 刘坚栋
Original assignee: TEBIAN ELECTROTECHNICAL CO Ltd XINJIANG
Current assignee: Tebian Electric Apparatus Stock Co Ltd
Priority date: 2003-05-27
Filing date: 2003-05-27
Publication date: 2004-06-30
Anticipated expiration: 2013-05-27

Abstract

The utility model relates to a loop three-phase cable winding transformer comprising a cable winding and a loop three-phase iron core. Cables used in a cable winding comprise a conductor wire core, an inner semiconducting layer, an insulating layer and an outer semiconducting layer. A wire core with a circular section is used in the conductor wire core as a conductor. The loop three-phase iron core comprises an iron core column, an upper yoke, a lower yoke and a cable winding arranged on the iron core column. The utility model is characterized in simple structure, material saving, low cost, simple operation, easy manufacturing, low empty and load loss, remarkable energy-saving effect, high safety and excellent environmental-friendly performance.

Description

Ring type threephase cable winding transformer

Technical field

The utility model belongs to the transformer technology field, relates to a kind of ring type threephase cable winding transformer specifically.

Background technology

Existing transformer structure commonly used has: structures such as shell-type, simplex winding core formula, three-phase, double wrap core assembly formula and annular.The iron core of these type transformers, generally adopt the silicon steel sheet punching press after lamination form, as common EI type.Waste of material is big in the above-mentioned EI sections core structure silicon steel sheet punching course, magnetic air gap is also big, cause that the transformer leakage field is big, exciting current is big, complex process and influence are very big simultaneously, the assembly technology a bit deficient in will cause operating big noise during bind, and volume is big, weight is also very heavy simultaneously.Structure described in DE40414, US2446999, GB2025150, US3792399, these patent documentations of US4229721 for example.

For the conventional electric power transformer, generally adopt the square-section lead, this lead is more concentrated in its four corner's field intensity, and Electric Field Distribution is extremely inhomogeneous.Simultaneously in order to make winding eddy current loss reduce to minimum, must replace along the lead of winding short transverse, can make the structure of winding very complicated like this; The design of conventional transformer also need consider to control the influence problem of electric field to grounded parts.This makes no matter conventional transformer is in design or manufacturing operation, all can more complicated.

Hidden danger is put in well-known oil-filled transformer existence office.High-volume excessive for fear of office, insulating treatment process is just very complicated.In order to obtain good insulation performance, must keep the low humidity of insulation, all necessary fully dipping of insulating element, the bubble of hidden danger is put in the existence office of getting rid of in the slit.Office puts in order to ensure reduction, and the device body is packed into and must be carried out specific drying and impregnation technology before the fuel tank.Also need take measures to improve Electric Field Distribution inequality and the influence that prevents partial discharge at winding overhang simultaneously;

In addition, if the temperature of discharge or the arbitrary parts local overheating that is in operation takes place in the oil-filled power transformer, the capital causes the decomposition of little water in oil, insulation or the oil, the gas that causes decomposing generation is dissolved in the oil, so that reduced oily insulation property, insulation simultaneously also can occur serious aging phenomenon because of being heated, decomposing.Conventional electric power transformer in addition, by means of insulating oil cooling, insulation, this makes it have problems such as for example leakage of oil, volume are big, transportation difficulty inevitably.

Summary of the invention

Technical problem to be solved in the utility model is at the above-mentioned defective that exists in the prior art, the ring type threephase cable winding transformer of provide a kind of simple in structure, good energy-conserving effect, being convenient to make, thus above-mentioned conventional oil-filled transformer complex process, leakage of oil, inflammable, explosive, long-standing problems such as volume big, transportation difficulty, feature of environmental protection difference solved.

The technical scheme that solution the utility model technical problem is adopted is that this ring type threephase cable winding transformer comprises cable winding, ring type tri-phase iron core.Described cable winding electricity consumption cable wrap is drawn together: conductor wire core, interior semi-conductive layer, insulating barrier and outer semiconducting layer, conductor wire core adopt the core of circular cross-section as conductor.Wherein interior semi-conductive layer, outer semiconducting layer can be made of identical base material, wherein all are mixed with electric conducting material for example carbon black or metal powder granulates.In order to make its coefficient of expansion and insulating barrier basic identical, add the amount of carbon black or metal dust and should under the prerequisite that does not influence mechanical property, implement according to the specific requirement of conductance.Because the inner and outer conductor cross sectional shape of cable no longer is the rectangular shape of conventional oil-filled transformer winding conductor, but the core that has adopted circular cross-section is as conductor, and round conductor has been set up equally distributed electric field.Adopt " three-layer co-extruded " structure that generally adopts in the existing crosslinked cable production can eliminate partial discharge greatly simultaneously.Wire transposition, the unequal problem of conductor Electric Field Distribution have thoroughly been solved.The skin of the conductor wire core of winding cable has at least one reliably to electrically contact with interior semi-conductive layer, to guarantee the unification of current potential.

Insulating layer material of the present utility model can be: such as the thermoplastic of types such as LDPE (low density polyethylene (LDPE)), HDPE (high density polyethylene (HDPE)), PP (polypropylene), PB (polybutene), PMP (polymethylpentene), XLPE (crosslinked polyethylene), EPR (ethylene-propylene rubber) or silicon rubber.The inside and outside semi-conductive layer of cable can be that the thermoplastic such as LDPE (low density polyethylene (LDPE)), HDPE (high density polyethylene (HDPE)), PP (polypropylene), PB (polybutene), PMP (polymethylpentene), XLPE (crosslinked polyethylene), EPR (ethylene-propylene rubber) or silicon rubber adds electric conductors such as carbon black, metal dust and makes.The resistance coefficient of semiconductive material is 10 ^-6In Ω cm～100k Ω cm scope, be generally 10 ^-3～1000 Ω cm are preferably 1～500 Ω cm.

Ring type tri-phase iron core of the present utility model comprises: iron core column, upper yoke, lower yoke.Because each iron core column is an integral body, thereby has reduced the magnetic consumption, has energy-saving effect preferably, has reduced noise simultaneously.

The upper end of three iron core column of the present utility model is fixedly mounted on respectively on the upper yoke of ring-type, and the lower end of three iron core column is fixedly mounted on respectively on the lower yoke of ring-type.Upper yoke and lower yoke can be triangles.Three iron core column are fixedly mounted on upper yoke respectively or/and three top corner parts of lower yoke make three iron core column constitute three ribs of triangular prism.The contact-making surface of iron core column and iron yoke can be plane or curved surface, and makes its reliable connection by the magnetism molecule binder.

Iron core column material of the present utility model can adopt non-crystaline amorphous metal or silicon steel sheet circle to make cylinder, or adopts the concentric cylinder cover system of non-crystaline amorphous metal, silicon steel sheet to form.

Description of drawings

Below in conjunction with the embodiment accompanying drawing the utility model is described in further detail.

Fig. 1: overall schematic of the present utility model

Fig. 2: iron core schematic diagram of the present utility model

Fig. 3: the winding sectional view of cable in the utility model

Among the figure: the 1-cable winding; The upper yoke of 2-iron core; The lower yoke of 3-iron core; The 4-iron core column; The 5-conductor wire core; Semi-conductive layer in the 6-; The 7-insulating barrier; The 8-outer semiconducting layer.

Embodiment

This ring type threephase cable winding transformer comprises ring type tri-phase iron core and cable winding (1), and the ring type tri-phase iron core comprises iron core column (4), upper yoke (2) and lower yoke (3), and winding (1) is installed on the iron core column.The lower end of three iron core column (4) is separately fixed on the lower yoke (3) of ring-type, requirement is sleeved on iron core column (4) on every side with each phase winding (1) of cable winding respectively according to specific design then, and the upper end with three iron core column (4) is fixedly mounted on respectively on the upper yoke (2) of ring-type at last.

The utility model is made earlier iron core column (4), upper yoke (2), lower yoke (3) and cable winding (1) respectively in the mill.After the iron core column (4) that is sleeved on winding (1) goes up, use the magnetism molecule adhesive that iron core column (4) and last lower yoke (2,3) is reliably bonding respectively.Because the iron core column of each phase is an integral body, thereby has reduced the magnetic consumption, realize energy-conservation, anti noise falls.Upper yoke (2) and lower yoke (3) can be triangles.Core material adopts non-crystaline amorphous metal or silicon steel sheet circle system to form, or adopts the concentric body cover system of non-crystaline amorphous metal, silicon steel sheet to form.

The utlity model has and avoid that transformer oil pollutes, office puts minimumly, insulation is reliable, operation environment safety, characteristics such as empty, that load loss is little, simple in structure, saves material, and is easy and simple to handle, is convenient to make, and energy-saving effect is obvious.

Claims

1, a kind of ring type threephase cable winding transformer, comprise cable winding, ring type tri-phase iron core, it is characterized in that described cable winding electricity consumption cable wrap draws together: conductor wire core, interior semi-conductive layer, insulating barrier and outer semiconducting layer, conductor wire core adopt the core of circular cross-section as conductor.

2, ring type threephase cable winding transformer according to claim 1, the conductor wire core (5) that it is characterized in that making the cable of winding is surrounded by interior semi-conductive layer (6), interior semi-conductive layer (6) is surrounded by insulating barrier (7), and insulating barrier (7) is surrounded by outer semiconducting layer (8).

3, according to right 1 or 2 described ring type threephase cable winding transformers, it is characterized in that interior semi-conductive layer, insulating barrier, the outer semiconducting layer of winding cable has similar thermal characteristics, mutual secure adhesion in the running.

4, ring type threephase cable winding transformer according to claim 1 and 2, the skin that it is characterized in that the conductor wire core of winding cable have at least one reliably to electrically contact with interior semi-conductive layer, to guarantee the unification of current potential.

5, ring type threephase cable winding transformer according to claim 1 and 2, the base material that it is characterized in that the insulating barrier of winding cable can be a low density polyethylene (LDPE), high density polyethylene (HDPE), polypropylene, polybutene, polymethylpentene, crosslinked polyethylene, the thermoplastic of ethylene-propylene rubber or silicon rubber type, the interior semi-conductive layer of cable, the material of outer semiconducting layer can be a low density polyethylene (LDPE), high density polyethylene (HDPE), polypropylene, polybutene, polymethylpentene, crosslinked polyethylene, the thermoplastic of ethylene-propylene rubber or silicon rubber type adds carbon black, electric conductors such as metal dust are made.

6, ring type threephase cable winding transformer according to claim 1, it is characterized in that the ring type tri-phase iron core comprises upper yoke, iron core column, lower yoke, the upper end of three iron core column is fixedly mounted on the upper yoke of ring-type, and the lower end of three iron core column is fixed on the lower yoke of ring-type.

7, ring type threephase cable winding transformer according to claim 6 is characterized in that upper yoke, the lower yoke of ring type tri-phase iron core is triangle.

8, according to claim 1 or 6 or 7 or 8 described ring type threephase cable winding transformers, it is characterized in that three iron core column of ring type tri-phase iron core are fixedly mounted on the top corner part of upper and lower iron yoke respectively, make three iron core column constitute three ribs of triangular prism.

9, ring type threephase cable winding transformer according to claim 8 is characterized in that core material adopts non-crystaline amorphous metal or silicon steel sheet circle system to form, or adopts the concentric body cover system of non-crystaline amorphous metal, silicon steel sheet to form.

10, ring type threephase cable winding transformer according to claim 9, the contact-making surface that it is characterized in that iron core column and iron yoke is plane or curved surface, makes its reliable connection by the magnetism molecule adhesive.