CN102867638A

CN102867638A - Armored shielding type high-voltage test transformer

Info

Publication number: CN102867638A
Application number: CN2012102743870A
Authority: CN
Inventors: 叶军; 张巧霞
Original assignee: WUHAN HUAXING SPECIAL TRANSFORMER MANUFACTURE CO Ltd
Current assignee: WUHAN HUAXING SPECIAL TRANSFORMER MANUFACTURE CO Ltd
Priority date: 2012-08-03
Filing date: 2012-08-03
Publication date: 2013-01-09
Anticipated expiration: 2032-08-03
Also published as: CN102867638B

Abstract

The invention relates to an armored shielding type high-voltage test transformer, which comprises a base, an iron core, a winding and a casting main body, wherein the casting main body and the base are integrally cast; the iron core is horizontally arranged on the base; a yoke of the iron core serves as a middle part of a casting mold; the upper edge of the base is connected with the yoke of the iron core and serves as the lower part of the casting mold; epoxy resin which is cast around the winding is filled among the winding, the iron core and the yoke and between the winding and the base; the yoke and a metal base are connected in a device structure which is molded by casting to form a shielding shell of a device; the upper part of the device structure is cast by using a mold; and the mold, the yoke and the base form a complete casting mold. By adoption of the armored shielding type high-voltage test transformer, the problem of surface discharge of a high-voltage-grade dry-type test transformer is effectively solved, and a brand-new solution is provided for the device insulating structure of a high-voltage-grade epoxy casting dry-type test transformer and a high-potential transformer. The armored shielding type high-voltage test transformer is simple in structure, reliable in performance and easy to manufacture.

Description

Armouring shielded high-voltage testing transformer

Technical field

The invention belongs to a kind of high voltage or high potential transformer, particularly a kind of armouring shielded high-voltage testing transformer.

Background technology

At existing dry testing transformer, especially epoxy resin pouring testing transformer product, because the high-tension coil surface field intensity of this transformer is very high, although its outer envelope certain thickness epoxy resins insulation layer, but still be difficult to avoid its ambient air generation electric discharge phenomena, affect product useful life and Operation safety.The existence of this phenomenon has obviously restricted the lifting of above-mentioned power transformer product electric pressure, is unfavorable for epoxy resin pouring HT testing transformer product, and especially the voltage levels product applies.

Summary of the invention

The purpose of this invention is to provide a kind of armouring shielded high-voltage testing transformer with novel device body insulation structure pattern, to solve the deficiencies in the prior art.

To achieve these goals, the technical solution adopted in the present invention is:

A kind of armouring shielded high-voltage testing transformer, comprise base, iron core and winding, described iron core is " E " shaped iron core or " ED " shaped iron core, be characterized in: also comprise: the cast main body that pours into an integrated entity with base, flat sleeping being installed on the base of described iron core, core center column sleeve dress winding, the low-voltage coil of described winding and high-tension coil are wound on the insulating cylinder successively, the iron yoke ring of described iron core is around the periphery of high-tension coil, the mid portion that also is used as casting mold, described base is the groove type metab that is arranged on the below of described winding, the base upper edge links to each other with the iron yoke, serves as the bottom of casting mold, and the epoxy resin of cast enriches in winding and iron core around the winding, between the iron yoke, between winding and the base, and supporting high-field electrode.Like this, the iron yoke links to each other with metab and becomes the screening can of device body (armouring shielding construction) in the machine body structure of moulding by casting.

In technique scheme, die casting is adopted on the top of described machine body structure, the casting mold of described mould and iron yoke and base complete, and high pressure (or high potential) electrode is drawn in the top of described mould, and low pressure (or electronegative potential) electrode is drawn in the below.

In technique scheme, in drawing the pour mass on edge on the position, iron yoke and low-field electrode be placed with and the equipotential stealth of iron yoke (or built-in) external shield ring, low-field electrode and iron yoke are carried out shielding, improve its peripheral Electric Field Distribution, prevent that it from electric discharge phenomena occuring.

In technique scheme, the periphery of described external shield ring is not less than the peripheral and outward extending size of its shielding object, to guarantee its shield effectiveness.

In technique scheme, described external shield ring can adopt tubular or round bar shape metal material to make.

In technique scheme, the outline of described external shield ring is circle or round rectangle.

In technique scheme, described high pressure winding outer surface holds one deck inner shield ring, described inner shield ring is the round rectangle sheet metal, its periphery encloses with round metal line or pipe fringing welding one, described inner shield ring two ends do not overlap, the about 10mm in interval connects into equipotential with wire and high-field electrode or high potential exit, to improve the Electric Field Distribution on high-tension coil surface.

In technique scheme, the cross section of described groove type base is polygon or circular arc.

The present invention compares with traditional technology, and it has following features:

(1) around the high-tension coil (except high-field electrode draw top) and earth potential conductor (iron core and base) between do not have the air gap owing to being full of epoxide resin encapsulation material, do not have the discharge of gas ionization flashing.

(2) shielding action of iron yoke and metab, blocked high voltage electric field to around and the radiation of below.

(3) sheathed structure that forms of iron yoke and base, also also mould of shell has been simplified the encapsulating die structure greatly.

(4) iron core horizontal positioned can only change iron core thickness and can adapt to capacity in the certain limit and change the long-pending requirement of corresponding core section in certain scope, such one pair of mould can be suitable for the capacity requirement of many grades of products.

Description of drawings

Fig. 1 is structural representation of the present invention.

Fig. 2 is inner shield structure of rings schematic diagram of the present invention.

Fig. 3 is the expanded view of Fig. 2.

Fig. 4 is external shield structure of rings schematic diagram of the present invention

Among the figure: 1-pour mass, 2-low pressure (electronegative potential) extraction electrode, 3-iron core column, 4-low-voltage coil winding, 5-high-tension coil winding, 6-insulating cylinder, 7-base, 8-iron yoke, 9-external shield ring, 10-inner shield ring, the 101-sheet metal, the 102-fringing, 11-high-voltage leading-out wire, 12-high-field electrode, 13-connecting line (high potential), the 14-earth connection.

Embodiment

Below in conjunction with accompanying drawing content of the present invention is described in further detail.

As shown in Figure 1, the device body insulation structure of armouring shielded high-voltage testing transformer of the present invention comprises base, iron core, winding, inner shield ring and stealthy external shield ring.Flat sleeping being installed on the base of iron core, the newel suit winding of iron core.High-tension coil is in the outside of winding, and the outer inner shield ring that is connected with high-voltage leading-out wire of high-tension coil holds.Be solidified into integral body after iron core column, base, winding and the shading ring cast.Wherein iron core and base earthing potential become outer shielding layer.The filling epoxy resin casting glue does not have the air gap between this screen and high-tension coil, has avoided the atmospherical discharges between this place and iron core fully, has improved useful life and the fail safe of transformer.

As shown in Figure 2, the inner shield ring is by round rectangle sheet metal and round metal line or pipe making, and the metallic plate periphery encloses with round metal line or pipe fringing welding one.The ring two ends of inner shield do not overlap, the about 10mm in interval, and an end connects into equipotential with wire and high-field electrode or high potential exit, and the diameter of fringing circle line or pipe can be different with the difference of electric pressure.The expanded view of inner shield ring as shown in Figure 3.

As shown in Figure 4, the external shield ring can adopt tubular or round bar shape metal material to make (also can to adopt nonmetal or pole or tube of material are made into ring-type, then the surface of shading ring forms uniform metal cladding outside), the material diameter of making this shading ring can be different with the difference of electric pressure.

The metal shell of above-mentioned armouring shielding construction also becomes the part of casting mold simultaneously, thereby the moulding of pour mass only need to draw from the top mould of high-field electrode, has greatly simplified the integrated poured mould structure of device body.

Because the different capabilities of transformer requires different iron core column sectional areas, for the overall dimension that requires iron core that satisfies capacity just has corresponding change.In the core dimensions of transformer of the present invention, only need change the within the specific limits requirement of adaptation capacity change of thickness of iron core, and can not cause the size of upper die to change, the product seriation that is conducive to realize and reduction cost of goods manufactured.

Above embodiment only is one embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Its specific structural details can be adjusted according to actual needs accordingly.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion, improvement and increase the auxiliary process measure, these all belong to protection scope of the present invention.

Claims

1. armouring shielded high-voltage testing transformer, comprise base, iron core and winding, it is characterized in that: also comprise: the cast main body that pours into an integrated entity with base, flat sleeping being installed on the base of described iron core, core center column sleeve dress winding, the low-voltage coil of described winding and high-tension coil are wound on the insulating cylinder successively, the iron yoke ring of described iron core is around the periphery of high-tension coil, the iron yoke of described iron core is used as the mid portion of casting mold, described base is the groove type metab that is arranged on the below of described winding, the base upper edge links to each other with the iron yoke of described iron core, the bottom of serving as casting mold, the epoxy resin of cast enriches in winding and iron core around the winding, between the iron yoke, between winding and the base, and supporting high-field electrode, the iron yoke links to each other with metab in the machine body structure of moulding by casting becomes the screening can of device body, die casting is adopted on the top of described machine body structure, the casting mold of described mould and iron yoke and base complete, high pressure or high-potential electrode are drawn in the top of described mould, and low pressure or low-potential electrode are drawn in the below.

2. armouring shielded high-voltage testing transformer as claimed in claim 1 is characterized in that: be placed with in the pour mass that iron yoke and the low-field electrode of described iron core are drawn edge on the position and the equipotential stealthy external shield ring of iron yoke or built-in external shield ring.

3. armouring shielded high-voltage testing transformer as claimed in claim 1, it is characterized in that: described high pressure winding outer surface holds one deck inner shield ring.

4. armouring shielded high-voltage testing transformer as claimed in claim 2 is characterized in that: the periphery of described external shield ring is not less than the peripheral and outward extending size of its shielding object.

5. armouring shielded high-voltage testing transformer as claimed in claim 2 is characterized in that: described external shield ring adopts tubular or round bar shape metal material to make.

6. armouring shielded high-voltage testing transformer as claimed in claim 2, it is characterized in that: the outline of described external shield ring is circle or round rectangle.

7. armouring shielded high-voltage testing transformer as claimed in claim 3, it is characterized in that: described inner shield ring is the round rectangle sheet metal, its periphery is with round metal line or pipe fringing welding one circle, connects into equipotential with wire and high-field electrode or high potential exit.

8. such as claim 3 or 7 described armouring shielded high-voltage testing transformers, it is characterized in that: described inner shield ring two ends do not overlap.

9. armouring shielded high-voltage testing transformer as claimed in claim 8 is characterized in that: described inner shield ring two ends do not overlap is spaced apart 10mm.

10. armouring shielded high-voltage testing transformer as claimed in claim 1, it is characterized in that: the cross section of described groove type base is polygon or circular arc.