CN110620000A - Voltage transformer and shielding case thereof - Google Patents
Voltage transformer and shielding case thereof Download PDFInfo
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- CN110620000A CN110620000A CN201910611661.0A CN201910611661A CN110620000A CN 110620000 A CN110620000 A CN 110620000A CN 201910611661 A CN201910611661 A CN 201910611661A CN 110620000 A CN110620000 A CN 110620000A
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- circumferential wall
- hole
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- bolt
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/288—Shielding
- H01F27/2885—Shielding with shields or electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/24—Voltage transformers
- H01F38/26—Constructions
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The invention relates to a voltage transformer and a shielding case thereof, wherein the shielding case comprises two circular arc-shaped tubes which are oppositely synthesized into a ring shape and are used for being tightly held and fixed at the outer side of a primary winding of the voltage transformer; two ends of each circular arc pipe are respectively fixed with a plug; one ends of the two arc-shaped pipes which are oppositely combined are fixedly connected through a bolt and are mutually conductive; one of the two plugs at the end, which corresponds to the nut of the bolt, is provided with a through hole, the other one is provided with a threaded hole matched with the bolt, the periphery of the circular arc pipe provided with the through hole is also provided with an operation hole, and the operation hole is arranged close to the through hole so that the bolt can be arranged in the circular arc pipe provided with the through hole and penetrates through the through hole to be in threaded connection with the threaded hole; the bolts for connecting the two arc-shaped pipes cannot influence the distribution of the electric field on the shielding cover, and after the two arc-shaped pipes are fixedly connected through the bolts, the shielding pipes do not need to be additionally arranged, so that the uniform distribution of the electric field on the shielding cover can be realized, the assembly efficiency of the voltage transformer is improved, and the cost of the voltage transformer is reduced.
Description
Technical Field
The invention relates to a voltage transformer and further relates to a shielding case for the voltage transformer.
Background
A high-voltage shielding cover is sleeved outside a primary winding of a sulfur hexafluoride gas insulation voltage transformer product and used for shielding a high-voltage electric field, and meanwhile, the starting end of a lead of the primary winding is in conductive connection with a central conductor of a basin-type insulator through the high-voltage shielding cover and is connected with the primary end of a line through the central conductor.
For satisfying voltage transformer's structural requirement, improve assembly efficiency, the utility model patent that the bulletin number is CN201601013U, and the bulletin date of granting is 2010.10.06 discloses a shield cover, and this shield cover comprises two convex tubulose subassemblies that enclose into the loop configuration, and the port at the both ends of two convex tubulose subassemblies is welded fastening respectively has the end cap. One end of each of the two arc-shaped tubular assemblies is fixedly connected through an insulating plate penetrating through the plug, and the other end of each of the two arc-shaped tubular assemblies is fixedly connected through a connecting plate fixed at the end part of the primary winding along the radial direction of the primary winding, so that the shielding cover is tightly held and fixed on the outer circumferential wall of the primary winding. And one end of each circular arc-shaped component fixedly connected through the insulating plate is taken as an insulating connecting end, one end fixedly connected through the connecting plate is taken as an electric connecting end, the corresponding plug corresponding to the insulating connecting end is taken as an insulating connecting plug, and the corresponding plug corresponding to the electric connecting end is taken as an electric connecting plug.
The connecting plate stretches out the shield cover outside and sets up, seriously influences the distribution of electric field on the shield cover, has the potential safety hazard, need set up the shielded tube outside the connecting plate and come even electric field during in-service use, when carrying out voltage transformer's assembly, need link firmly two connecting plates through the bolt earlier, then set up the shielded tube in connecting plate department, the setting of shielded tube has reduced voltage transformer's assembly efficiency, and has increased voltage transformer's cost.
Disclosure of Invention
The invention aims to provide a shielding case, so that an electric field on the shielding case is uniformly distributed, the assembly efficiency of a voltage transformer is improved, and the cost of the voltage transformer is reduced; the invention also aims to provide the voltage transformer, so that the assembly efficiency of the voltage transformer is improved, and the cost of the voltage transformer is reduced.
The shielding case adopts the following technical scheme:
the shielding cover comprises two circular arc-shaped tubes which are relatively synthesized into a ring shape and used for being tightly held and fixed on the outer side of a primary winding of the voltage transformer;
two ends of each circular arc pipe are respectively fixed with a plug;
one ends of the two arc-shaped pipes which are oppositely combined are fixedly connected through a bolt and are mutually conductive;
one of the two plugs at the end, which corresponds to the nut of the bolt, is provided with a through hole, the other one is provided with a threaded hole matched with the bolt, the periphery of the circular arc tube provided with the through hole is also provided with an operation hole, and the operation hole is arranged close to the through hole so that the bolt can be arranged in the circular arc tube provided with the through hole and penetrates through the through hole to be in threaded connection with the threaded hole;
or, the two plugs at the end are provided with through holes, the bolt is provided with a nut, the peripheries of the two circular arc pipes are provided with operation holes, and each operation hole is arranged close to the through hole of the corresponding circular arc pipe, so that the bolt and the nut are respectively arranged in the corresponding circular arc pipe, and the bolt penetrates through the two through holes to be in threaded connection with the nut.
The invention has the beneficial effects that: the periphery of the arc-shaped pipe is provided with the operation hole, the bolt is arranged in the corresponding arc-shaped pipe from the operation hole and penetrates through the through hole to be in threaded connection with the threaded hole, so that the fixed connection and mutual conduction of one end of the two arc-shaped pipes which are mutually jointed are realized, the bolt for connecting the two arc-shaped pipes is positioned in the arc-shaped pipes, and the electric field on the shielding cover is mainly distributed on the peripheral surface of the shielding cover, so that the distribution of the electric field on the shielding cover cannot be influenced by the bolt for connecting the two arc-shaped pipes; or the bolt and the nut are respectively installed into the corresponding circular arc tubes from the operation holes of the two circular arc tubes and penetrate through the two through holes to be in threaded connection with the nut, so that the fixed connection and mutual conduction of the two opposite ends of the two circular arc tubes are realized, the bolt and the nut which are connected with the two circular arc tubes are both positioned in the circular arc tubes, and the electric field on the shielding cover is mainly distributed on the peripheral surface of the shielding cover, therefore, the bolt and the nut which are connected with the two circular arc tubes cannot influence the distribution of the electric field on the shielding cover, after the two circular arc tubes are fixedly connected through the bolt and the nut, the uniform distribution of the electric field on the shielding cover can be realized without additionally arranging the shielding tubes, the assembly efficiency of the voltage transformer is improved, and the cost of the voltage transformer is reduced.
As the preferred technical scheme, the two circular arc pipes are both semicircular arc pipes.
Has the advantages that: the two arc-shaped pipes are both semicircular arc-shaped pipes, so that the main body sizes of the two circular arc-shaped pipes are the same, and the design and processing of the two circular arc-shaped pipes are facilitated.
As a preferred technical scheme, each circular arc-shaped pipe comprises an inner circumferential wall, an outer circumferential wall and two middle arc-shaped walls, wherein the outer circumferential wall and the inner circumferential wall are coaxially arranged, the outer circumferential wall is arranged on the radial outer side of the inner circumferential wall, and the two middle arc-shaped walls are respectively connected to the two axial sides of the inner circumferential wall and the outer circumferential wall;
and a conductive tube is fixed on the outer circumferential wall of one of the circular arc tubes and is used for being inserted with the central conductor of the basin-type insulator.
Has the advantages that: when the shielding cover is electrically connected with the central conductor of the basin-type insulator, the conductive tube is directly inserted into the central conductor of the basin-type insulator, the shielding cover is conveniently connected with the central conductor of the basin-type insulator, and the assembly efficiency of the voltage transformer is further improved; in addition, the arc tube is shaped such that the electric field on the shield is mainly distributed over the central arc wall, while the conductive tube arranged on the outer circumferential wall does not substantially affect the distribution of the electric field on the shield.
As a preferred technical scheme, each circular arc-shaped pipe comprises an inner circumferential wall, an outer circumferential wall and two middle arc-shaped walls, wherein the outer circumferential wall and the inner circumferential wall are coaxially arranged, the outer circumferential wall is arranged on the radial outer side of the inner circumferential wall, and the two middle arc-shaped walls are respectively connected to the two axial sides of the inner circumferential wall and the outer circumferential wall;
and an outlet hole is formed in the inner circumferential wall of one of the circular arc pipes, so that a lead of the primary winding can pass through the outlet hole and is in conductive connection with the bolt.
Has the advantages that: the lead of the primary winding penetrates out of the wire outlet hole and is in conductive connection with the shielding case through the bolt, so that the primary winding is conveniently and electrically connected with the shielding case, and the assembly efficiency of the voltage transformer is further improved; in addition, the shape of the arc tube makes the electric field on the shield cover mainly distributed on the middle arc wall, and the arrangement of the wire outlet on the inner circumferential wall does not influence the distribution of the electric field on the shield cover basically.
The voltage transformer adopts the following technical scheme:
the voltage transformer comprises a transformer body, wherein the transformer body comprises a primary winding and a shielding case arranged on the outer side of the primary winding;
the shielding cover comprises two circular arc-shaped tubes which are relatively synthesized into a ring shape and used for being tightly held and fixed on the outer side of a primary winding of the voltage transformer;
two ends of each circular arc pipe are respectively fixed with a plug;
one ends of the two arc-shaped pipes which are oppositely combined are fixedly connected through a bolt and are mutually conductive;
one of the two plugs at the end, which corresponds to the nut of the bolt, is provided with a through hole, the other one is provided with a threaded hole matched with the bolt, the periphery of the circular arc tube provided with the through hole is also provided with an operation hole, and the operation hole is arranged close to the through hole so that the bolt can be arranged in the circular arc tube provided with the through hole and penetrates through the through hole to be in threaded connection with the threaded hole;
or, the two plugs at the end are provided with through holes, the bolt is provided with a nut, the peripheries of the two circular arc pipes are provided with operation holes, and each operation hole is arranged close to the through hole of the corresponding circular arc pipe, so that the bolt and the nut are respectively arranged in the corresponding circular arc pipe, and the bolt penetrates through the two through holes to be in threaded connection with the nut.
The invention has the beneficial effects that: the periphery of the arc-shaped pipe is provided with the operation hole, the bolt is arranged in the corresponding arc-shaped pipe from the operation hole and penetrates through the through hole to be in threaded connection with the threaded hole, so that the fixed connection and mutual conduction of one end of the two arc-shaped pipes which are mutually jointed are realized, the bolt for connecting the two arc-shaped pipes is positioned in the arc-shaped pipes, and the electric field on the shielding cover is mainly distributed on the peripheral surface of the shielding cover, so that the distribution of the electric field on the shielding cover cannot be influenced by the bolt for connecting the two arc-shaped pipes; or the bolt and the nut are respectively installed into the corresponding circular arc tubes from the operation holes of the two circular arc tubes and penetrate through the two through holes to be in threaded connection with the nut, so that the fixed connection and mutual conduction of the two opposite ends of the two circular arc tubes are realized, the bolt and the nut which are connected with the two circular arc tubes are both positioned in the circular arc tubes, and the electric field on the shielding cover is mainly distributed on the peripheral surface of the shielding cover, therefore, the bolt and the nut which are connected with the two circular arc tubes cannot influence the distribution of the electric field on the shielding cover, after the two circular arc tubes are fixedly connected through the bolt and the nut, the uniform distribution of the electric field on the shielding cover can be realized without additionally arranging the shielding tubes, the assembly efficiency of the voltage transformer is improved, and the cost of the voltage transformer is reduced.
As the preferred technical scheme, the two circular arc pipes are both semicircular arc pipes.
Has the advantages that: the two arc-shaped pipes are both semicircular arc-shaped pipes, so that the main body sizes of the two circular arc-shaped pipes are the same, and the design and processing of the two circular arc-shaped pipes are facilitated.
As a preferred technical scheme, each circular arc-shaped pipe comprises an inner circumferential wall, an outer circumferential wall and two middle arc-shaped walls, wherein the outer circumferential wall and the inner circumferential wall are coaxially arranged, the outer circumferential wall is arranged on the radial outer side of the inner circumferential wall, and the two middle arc-shaped walls are respectively connected to the two axial sides of the inner circumferential wall and the outer circumferential wall;
and a conductive tube is fixed on the outer circumferential wall of one of the circular arc tubes and is used for being inserted with the central conductor of the basin-type insulator.
Has the advantages that: when the shielding cover is electrically connected with the central conductor of the basin-type insulator, the conductive tube is directly inserted into the central conductor of the basin-type insulator, the shielding cover is conveniently connected with the central conductor of the basin-type insulator, and the assembly efficiency of the voltage transformer is further improved; in addition, the arc tube is shaped such that the electric field on the shield is mainly distributed over the central arc wall, while the conductive tube arranged on the outer circumferential wall does not substantially affect the distribution of the electric field on the shield.
As a preferred technical scheme, each circular arc-shaped pipe comprises an inner circumferential wall, an outer circumferential wall and two middle arc-shaped walls, wherein the outer circumferential wall and the inner circumferential wall are coaxially arranged, the outer circumferential wall is arranged on the radial outer side of the inner circumferential wall, and the two middle arc-shaped walls are respectively connected to the two axial sides of the inner circumferential wall and the outer circumferential wall;
and an outlet hole is formed in the inner circumferential wall of one of the circular arc pipes, so that a lead of the primary winding can pass through the outlet hole and is in conductive connection with the bolt.
Has the advantages that: the lead of the primary winding penetrates out of the wire outlet hole and is in conductive connection with the shielding case through the bolt, so that the primary winding is conveniently and electrically connected with the shielding case, and the assembly efficiency of the voltage transformer is further improved; in addition, the shape of the arc tube makes the electric field on the shield cover mainly distributed on the middle arc wall, and the arrangement of the wire outlet on the inner circumferential wall does not influence the distribution of the electric field on the shield cover basically.
As a preferable technical solution, the operation hole is provided to be offset from a bottom shield plate of the voltage transformer in a vertical direction.
Has the advantages that: the operating hole is deviated voltage transformer's end shield plate setting in vertical direction, can prevent end shield plate influence shield cover assembly on primary winding, further improves voltage transformer's assembly efficiency.
Drawings
FIG. 1 is a perspective view of an embodiment of a shield of the present invention;
FIG. 2 is a front view of an embodiment of the shield of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is an enlarged view of a portion of FIG. 2 at B;
FIG. 5 is a front view of the insulating plate of FIG. 4;
FIG. 6 is a left side view of the insulating plate of FIG. 4;
FIG. 7 is a cross-sectional view of the insulating sleeve of FIG. 4;
FIG. 8 is a front view of the first arcuate tube of FIG. 1;
FIG. 9 is a left side view of the first arcuate tube of FIG. 1;
FIG. 10 is a rear elevational view of the first arcuate tube of FIG. 1;
FIG. 11 is a front view of the second tube of FIG. 1;
FIG. 12 is a left side view of the second circular arc tube of FIG. 1;
FIG. 13 is a rear elevational view of the second arcuate tube illustrated in FIG. 1;
fig. 14 is a perspective view of an embodiment of the voltage transformer of the present invention (only the body is shown, the housing and the basin insulator are not shown);
FIG. 15 is a front view of an embodiment of the voltage transformer of the present invention;
fig. 16 is a right side view of an embodiment of the voltage transformer of the present invention.
In the figure: 1-a first circular arc-shaped tube; 2-a second circular arc-shaped pipe; 3-a first bolt; 4-an insulating sleeve; 5-an insulating plate; 6-a first handling hole; 7-a second handling hole; 8-wire outlet holes; 9-a conductive tube; 10-a second bolt; 11-a first perforation; 12-a first threaded hole; 13-a first electrical connection plug; 14-a first insulating connection plug; 21-second perforation; 22-a second threaded hole; 23-a second electrical connection plug; 24-a second insulating connecting plug; 41-sleeve body; 42-an insulating disk; 51-perforation; 100-a primary winding; 101-side shielding plate; 102-bottom shielding plate.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The specific embodiment of the shielding case of the present invention, the shielding case in this embodiment is used in a sulfur hexafluoride gas insulation single-phase voltage transformer product, as shown in fig. 1 to 4, the shielding case is of a two-piece type, and includes two circular arc tubes which are relatively synthesized into a ring shape, and are respectively a first circular arc tube 1 and a second circular arc tube 2, and each of the first circular arc tube 1 and the second circular arc tube 2 includes an inner circumferential wall, an outer circumferential wall and two middle arc walls, wherein the outer circumferential wall and the inner circumferential wall are coaxially arranged, the outer circumferential wall is arranged on the radial outer side of the inner circumferential wall, and the two middle arc walls are respectively connected to the axial two sides of the inner circumferential wall and the outer circumferential wall, as shown in fig. 14 to 16, when the shielding case is assembled outside a primary winding 100 of a voltage transformer, the two circular arc tubes are tightly held and fixed outside the.
As shown in fig. 8 to 10, two ends of the first circular arc tube 1 and the second circular arc tube 2 are respectively an electrical connection end and an insulation connection end, and two ends of the first circular arc tube 1 are respectively welded and fixed with a plug, wherein the plug corresponding to the electrical connection end is a first electrical connection plug 13, and the plug corresponding to the insulation connection end is a first insulation connection plug 14; as shown in fig. 11 to 13, plugs are respectively welded and fixed at two ends of the second circular arc tube 2, wherein the plug corresponding to the electrical connection end is a second electrical connection plug 23, and the plug corresponding to the insulating connection end is a second insulating connection plug 24. The first insulating connecting plug 14 and the second insulating connecting plug 24 are made of metal materials, and the insulating connecting plugs are only insulated from each other.
As shown in fig. 3, the electric connection ends of the first and second circular arc pipes 1 and 2 are fixedly connected by a first bolt 3 and are electrically conductive with each other. As shown in fig. 8, the first electrical connection plug 13 is provided with a threaded hole, i.e., a first threaded hole 12; as shown in fig. 11, the second electrical connection plug 23 is provided with a through hole, i.e., a second through hole 21; a second operation hole 7 is formed in the position, close to the second through hole 21, of the outer circumferential wall of the second circular arc-shaped tube 2, the first bolt 3 is installed in the second circular arc-shaped tube 2 through the second operation hole 7, the stud of the first bolt 3 penetrates through the second through hole 21 and is in threaded connection with the first threaded hole 12, and the nut of the first bolt 3 is located in the second circular arc-shaped tube 2 and is in stop fit with the second electric connection plug 23 to achieve fixed connection of the two circular arc-shaped tubes. During specific operation, the first bolt 3 is installed into the second arc-shaped tube 2 from the second operation hole 7 through a corresponding tool, the first bolt 3 is screwed, electric connection between the two petals is achieved through the first bolt 3, and conduction of a circuit and a magnetic circuit between the two petals is guaranteed. The tool is defined by the nut of the first bolt 3, for example, when the first bolt 3 is a hexagon socket head bolt, the tool is a hexagon socket wrench.
As shown in fig. 4, the insulation connection ends of the first and second circular arc pipes 1 and 2 are combined and fixedly connected with each other by a second bolt 10, the second bolt 10 is a metal bolt, and as shown in fig. 8, the first insulation connection plug 14 is provided with a through hole, i.e., a first through hole 11, which is matched with the second bolt 10; as shown in fig. 11, the second insulating connecting plug 24 is provided with a threaded hole matched with the second bolt 10, i.e. a second threaded hole 22; the first arc-shaped pipe 1 is provided with a first operating hole 6 on the outer circumferential wall thereof near the first through hole 11.
An insulating plate 5 shown in fig. 5 and 6 is further arranged between the two insulating connecting plugs, the shape and the size of the insulating plate 5 are matched with those of any insulating connecting plug, and a through hole 51 for the second bolt 10 to pass through is formed in the insulating plate 5; the insulating sleeve 4 shown in fig. 7 is sleeved on the bolt of the second bolt 10, the insulating sleeve 4 includes a sleeve body 41 and an insulating disc 42 disposed at one end of the sleeve body 41, an inner hole of the insulating sleeve 4 penetrates through the sleeve body 41 and the insulating disc 42, and the insulating sleeve 4 constitutes an insulating member in this embodiment. When the second bolt 10 is screwed on the second threaded hole 22, the insulation connection ends of the two arc pipes are combined and fixedly connected relatively, at the moment, the insulation plate 5 is clamped between the insulation connection plugs of the two arc pipes, the sleeve body 41 is sleeved on the stud of the second bolt 10, and the insulation disc 42 is clamped between the nut of the second bolt 10 and the inner side surface of the first insulation connection plug 14, so that insulation between the first insulation connection plug 14 and the second insulation connection plug 24 is realized, and therefore, the circuit and the magnetic circuit between the first arc pipe 1 and the second arc pipe 2 are disconnected, and an electric field and a magnetic field closed loop cannot be formed between the two petals of the shielding cover. Above-mentioned second bolt 10 is as the main atress part of the insulating link of two circular arc pipes, insulation board 5 and insulating cover 4 mainly play the mutual insulating effect between the two circular arc pipes of this end, when carrying out high temperature drying with the ware body of voltage transformer that assembles, even insulation board 5 and insulating cover 4 are heated and take place to warp, can not influence the insulating properties between the two circular arc pipes of this end yet, and second bolt 10 is metal bolt, it is difficult for taking place to warp to be heated, can guarantee the connection stability of the insulating link of two circular arc pipes, and then improve voltage transformer's performance.
When carrying out the fixed connection of the insulating link of first circular arc pipe 1 and second circular arc pipe 2, with the 5 centre gripping of insulation board between two insulating connection end caps, insulating cover 4 suit is on the double-screw bolt of second bolt 10, the second bolt 10 that the cover was equipped with insulating cover 4 is packed into in first circular arc pipe 1 and is worn out threaded connection on second screw hole 22 from first handle hole 6 and from first perforation 11, perforation 51 from first perforation, realizes the fixed connection of the insulating link of two circular arc pipes. During specific operation, the second bolt 10 sleeved with the insulating sleeve 4 is installed in the first circular arc-shaped pipe 1 through a corresponding tool, and the second bolt 10 is screwed. The tool is defined by the nut of the second bolt 10, for example, an alien wrench when the second bolt 10 is a hexagon socket head bolt.
As shown in fig. 11, an outlet hole 8 is provided on the inner circumferential wall of the second arc tube 2, and the lead wire of the primary winding 100 passes through the outlet hole 8 and is electrically connected to the first bolt 3. Specifically, the wire outlet hole 8 is closer to the second operation hole 7, before the first bolt 3 is installed in the second circular arc tube 2 from the second operation hole 7, the lead of the primary winding 100 firstly penetrates through the wire outlet hole 8 and penetrates out of the second operation hole 7, then a wire nose is wound at the end of the lead and penetrates through the first bolt 3, and then the first bolt 3 is installed in the second circular arc tube 2 and is in threaded connection with the first circular arc tube 1, so that the primary winding 100 is electrically connected with the shielding case.
As shown in fig. 1, the conductive tube 9 is welded on the outer circumferential wall of the first circular arc tube 1, the length and diameter of the conductive tube 9 can be adapted according to the product structure, and when the product is assembled, the conductive tube 9 is directly inserted into the electrical connection contact of the central conductor of the basin-type insulator, so that the equipotential among the primary winding 100, the shielding case, and the central conductor of the basin-type insulator is realized.
For facilitating the design and processing of the shielding case, the first circular arc tube 1 and the second circular arc tube 2 in the embodiment are both semicircular arc tubes, and the difference is that the second circular arc tube 2 is provided with a wire outlet 8, and the first circular arc tube 1 is welded with a conductive tube 9.
When sulfur hexafluoride gas insulation single-phase voltage transformer products are assembled, the shielding cover can meet the requirements of convenient assembly and reliable quality of the voltage transformer, the first operating hole 6 and the second operating hole 7 are arranged to facilitate the assembly of the first bolt 3 and the second bolt 10, in addition, the first operating hole 6 and the second operating hole 7 are respectively arranged on the outer circumferential wall of the first circular arc-shaped tube 1 and the outer circumferential wall of the second circular arc-shaped tube 2, and the electric field on the shielding cover is mainly distributed on the middle arc-shaped wall, so that the distribution of the electric field on the shielding cover is basically not influenced by the first operating hole 6 and the second operating hole 7.
In other embodiments, the shielding case can also be used in sulfur hexafluoride gas insulation three-phase voltage transformer products, and the size and shape of the conductive pipes can be set according to the arrangement mode of the three-phase voltage transformer, so that the conductive pipes of the three-phase voltage transformer are correspondingly inserted with the central conductors of the three-phase basin-type insulators respectively.
In other embodiments, the first bolt may also be provided with a nut, at this time, the two electrical connection plugs are both provided with through holes, the peripheries of the two circular arc pipes are both provided with operation holes, each operation hole is arranged close to the through hole of the corresponding circular arc pipe, so that the first bolt and the nut are respectively installed in the corresponding circular arc pipe and penetrate the two through holes to be in threaded connection with the nut, and the fixed connection of the electrical connection ends of the two circular arc pipes and the mutual conduction are realized.
In other embodiments, the conductive tube and the center conductor of the basin insulator can be electrically connected through a flexible wire.
In other embodiments, the two arc pipes may have main dimensions as required, for example, the first arc pipe is a quarter arc pipe, the second arc pipe is a quarter arc pipe, and the two arc pipes are oppositely combined into a ring.
In other embodiments, the insulating connection ends of the two circular arc pipes can also be connected by the insulating plate disclosed in the utility model with the publication number CN201601013U, that is, the first insulating connection plug and the second insulating connection plug are respectively provided with through holes, and the insulating plate passes through the two through holes and is fixedly connected with the corresponding circular arc pipes by nylon bolts.
In a specific embodiment of the voltage transformer of the present invention, the voltage transformer is a sulfur hexafluoride gas-insulated single-phase voltage transformer, as shown in fig. 14 to 16, the voltage transformer includes a transformer body, the transformer body includes a primary winding 100 and a shielding case disposed outside the primary winding, both sides of the primary winding 100 are provided with side shielding plates 101, and the bottom of the primary winding 100 is further provided with a bottom shielding plate 102. The electric connection plugs of the two arc pipes are arranged close to the top of the transformer body, the insulation connection plugs are arranged close to the bottom of the transformer body, and the insulation connection plugs and the first assembly holes 6 are arranged deviated from the bottom shielding plate 102 in the vertical direction, so that the bottom shielding plate 102 does not influence the assembly of the shielding case on the primary winding 100.
The specific assembly process of the shielding case of the voltage transformer comprises the following steps: a lead of the primary winding 100 is led out through the position of the wire outlet hole 8, and penetrates through the first bolt 3 through a wire nose, and the first bolt 3 extends into the first circular arc-shaped tube 1 through the second operation hole 7 to be assembled and fastened, so that the primary winding 100 is electrically connected with the shielding case and the two circular arc-shaped tubes; the insulating plate 5 is clamped between the insulating connecting plugs of the two circular arc pipes, and the second bolt 10 and the insulating sleeve 4 extend into the second circular arc pipe 2 through the first operating hole 6 to be assembled and fastened, so that the circuit and the magnetic circuit between the two petals are disconnected; and then the conducting tube 9 is matched with an electric connection contact of the primary circuit, so that equipotential connection of the primary winding 100, the shielding cover and the central conductor of the basin-type insulator is realized.
In other embodiments, the electrical connection plugs of the two circular arc pipes can be arranged near the bottom of the transformer body, the insulating connection plug is arranged near the top of the transformer body, and the electrical connection plug and the second assembly hole are arranged offset from the bottom shielding plate in the vertical direction; or one end of any one of the two arc-shaped pipes which are combined together and arranged close to the bottom of the transformer body is vertically positioned right above the bottom shielding case, and the operation hole arranged close to the bottom of the transformer body is only required to be arranged to deviate from the bottom shielding case in the vertical direction.
Claims (9)
1. The shielding cover comprises two circular arc-shaped tubes which are relatively synthesized into a ring shape and used for being tightly held and fixed on the outer side of a primary winding of the voltage transformer;
two ends of each circular arc pipe are respectively fixed with a plug;
the device is characterized in that one ends of the two arc-shaped pipes which are mutually butted are fixedly connected through a bolt and are mutually conductive;
one of the two plugs at the end, which corresponds to the nut of the bolt, is provided with a through hole, the other one is provided with a threaded hole matched with the bolt, the periphery of the circular arc tube provided with the through hole is also provided with an operation hole, and the operation hole is arranged close to the through hole so that the bolt can be arranged in the circular arc tube provided with the through hole and penetrates through the through hole to be in threaded connection with the threaded hole;
or, the two plugs at the end are provided with through holes, the bolt is provided with a nut, the peripheries of the two circular arc pipes are provided with operation holes, and each operation hole is arranged close to the through hole of the corresponding circular arc pipe, so that the bolt and the nut are respectively arranged in the corresponding circular arc pipe, and the bolt penetrates through the two through holes to be in threaded connection with the nut.
2. The shield of claim 1 wherein the two circular arc tubes are semi-circular arc tubes.
3. The shield cover according to claim 1 or 2, wherein each of the arc-shaped pipes includes an inner circumferential wall, an outer circumferential wall and two intermediate arc-shaped walls, the outer circumferential wall and the inner circumferential wall are coaxially disposed and the outer circumferential wall is disposed radially outside the inner circumferential wall, the two intermediate arc-shaped walls are respectively connected to both axial sides of the inner circumferential wall and the outer circumferential wall;
and a conductive tube is fixed on the outer circumferential wall of one of the circular arc tubes and is used for being inserted with the central conductor of the basin-type insulator.
4. The shield cover according to claim 1 or 2, wherein each of the arc-shaped pipes includes an inner circumferential wall, an outer circumferential wall and two intermediate arc-shaped walls, the outer circumferential wall and the inner circumferential wall are coaxially disposed and the outer circumferential wall is disposed radially outside the inner circumferential wall, the two intermediate arc-shaped walls are respectively connected to both axial sides of the inner circumferential wall and the outer circumferential wall;
and an outlet hole is formed in the inner circumferential wall of one of the circular arc pipes, so that a lead of the primary winding can pass through the outlet hole and is in conductive connection with the bolt.
5. The voltage transformer comprises a transformer body, wherein the transformer body comprises a primary winding and a shielding case arranged on the outer side of the primary winding;
the shielding cover comprises two circular arc-shaped tubes which are relatively synthesized into a ring shape and used for being tightly held and fixed on the outer side of a primary winding of the voltage transformer;
two ends of each circular arc pipe are respectively fixed with a plug;
the device is characterized in that one ends of the two arc-shaped pipes which are mutually butted are fixedly connected through a bolt and are mutually conductive;
one of the two plugs at the end, which corresponds to the nut of the bolt, is provided with a through hole, the other one is provided with a threaded hole matched with the bolt, the periphery of the circular arc tube provided with the through hole is also provided with an operation hole, and the operation hole is arranged close to the through hole so that the bolt can be arranged in the circular arc tube provided with the through hole and penetrates through the through hole to be in threaded connection with the threaded hole;
or, the two plugs at the end are provided with through holes, the bolt is provided with a nut, the peripheries of the two circular arc pipes are provided with operation holes, and each operation hole is arranged close to the through hole of the corresponding circular arc pipe, so that the bolt and the nut are respectively arranged in the corresponding circular arc pipe, and the bolt penetrates through the two through holes to be in threaded connection with the nut.
6. The voltage transformer of claim 5, wherein the two circular arc shaped tubes are semi-circular arc shaped tubes.
7. The voltage transformer according to claim 5 or 6, wherein each of the arc-shaped tubes comprises an inner circumferential wall, an outer circumferential wall and two intermediate arc-shaped walls, the outer circumferential wall and the inner circumferential wall are coaxially arranged and the outer circumferential wall is arranged radially outside the inner circumferential wall, and the two intermediate arc-shaped walls are respectively connected to two axial sides of the inner circumferential wall and the outer circumferential wall;
and a conductive tube is fixed on the outer circumferential wall of one of the circular arc tubes and is used for being inserted with the central conductor of the basin-type insulator.
8. The voltage transformer according to claim 5 or 6, wherein each of the arc-shaped tubes comprises an inner circumferential wall, an outer circumferential wall and two intermediate arc-shaped walls, the outer circumferential wall and the inner circumferential wall are coaxially arranged and the outer circumferential wall is arranged radially outside the inner circumferential wall, and the two intermediate arc-shaped walls are respectively connected to two axial sides of the inner circumferential wall and the outer circumferential wall;
and an outlet hole is formed in the inner circumferential wall of one of the circular arc pipes, so that a lead of the primary winding can pass through the outlet hole and is in conductive connection with the bolt.
9. The voltage transformer according to claim 5 or 6, wherein the handling hole is arranged vertically offset from a bottom shielding plate of the voltage transformer.
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|---|---|---|---|
| CN201910611661.0A CN110620000B (en) | 2019-07-08 | 2019-07-08 | Voltage transformer and shielding case thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910611661.0A CN110620000B (en) | 2019-07-08 | 2019-07-08 | Voltage transformer and shielding case thereof |
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| CN110620000A true CN110620000A (en) | 2019-12-27 |
| CN110620000B CN110620000B (en) | 2021-02-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113851282A (en) * | 2021-11-09 | 2021-12-28 | 南方电网科学研究院有限责任公司 | GIS basin-type insulator surface charge shielding device |
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| CN108831707A (en) * | 2018-06-23 | 2018-11-16 | 南通涵宇新能源电力工程有限公司 | A kind of combined electromagnetic voltage transformer body and its manufacturing method |
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| JPS61135107A (en) * | 1984-12-06 | 1986-06-23 | Toshiba Corp | Gas insulated transformer for instrument |
| JPH0360107A (en) * | 1989-07-28 | 1991-03-15 | Toko Denki Kk | Method and structure for installing high pressure shield of transformer |
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| CN113851282A (en) * | 2021-11-09 | 2021-12-28 | 南方电网科学研究院有限责任公司 | GIS basin-type insulator surface charge shielding device |
| CN113851282B (en) * | 2021-11-09 | 2024-01-09 | 南方电网科学研究院有限责任公司 | GIS basin-type insulator surface charge shielding device |
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| CN110620000B (en) | 2021-02-23 |
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