CN110619997B - Voltage transformer and shielding case thereof - Google Patents

Voltage transformer and shielding case thereof Download PDF

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Publication number
CN110619997B
CN110619997B CN201910610774.9A CN201910610774A CN110619997B CN 110619997 B CN110619997 B CN 110619997B CN 201910610774 A CN201910610774 A CN 201910610774A CN 110619997 B CN110619997 B CN 110619997B
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China
Prior art keywords
arc
shaped
bolt
opening
voltage transformer
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CN201910610774.9A
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CN110619997A (en
Inventor
陈奕嘉
连玺
岳光华
田超群
贺小维
岳天松
张晓鹏
李阳
房鑫
魏晓耀
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State Grid Corp of China SGCC
Pinggao Group Co Ltd
Henan Pinggao Electric Co Ltd
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State Grid Corp of China SGCC
Pinggao Group Co Ltd
Henan Pinggao Electric Co Ltd
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Application filed by State Grid Corp of China SGCC, Pinggao Group Co Ltd, Henan Pinggao Electric Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201910610774.9A priority Critical patent/CN110619997B/en
Publication of CN110619997A publication Critical patent/CN110619997A/en
Application granted granted Critical
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/34Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36Electric or magnetic shields or screens
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20Instruments transformers
    • H01F38/22Instruments transformers for single phase ac
    • H01F38/24Voltage transformers
    • H01F38/26Constructions

Abstract

The invention relates to a voltage transformer and a shielding case thereof, wherein the shielding case comprises two arc-shaped pieces which are relatively 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; openings are formed in the radial outer sides of the circular arc-shaped pieces, and connecting blocks are fixed to the two ends of each circular arc-shaped piece at the bottom of each opening respectively; one end of the two arc-shaped pieces which are oppositely combined is fixedly connected through a bolt and is mutually conductive; the size of the opening meets the requirement of operating the bolt, and the bolt is immersed in the opening; one of the two connecting blocks at the end, which corresponds to the nut of the bolt, is provided with a through hole, the other connecting block is provided with a threaded hole matched with the bolt, and the opening of the circular arc-shaped part provided with the through hole is used for the bolt to be installed and penetrates through the through hole to be in threaded connection with the threaded hole; after the two arc-shaped pieces are fixedly connected through the bolts, the shielding pipes do not need to be additionally arranged, 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

Voltage transformer and shielding case thereof
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 grant bulletin number is CN201601013U, and the grant bulletin date 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 connecting block. One end of each of the two arc-shaped tubular assemblies is fixedly connected through an insulating plate penetrating through the connecting block, 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 surface of the primary winding. The connecting block corresponding to the corresponding insulating connecting end is an insulating connecting block, and the connecting block corresponding to the electric connecting end is an electric connecting block.
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:
a shielding cover comprises two arc-shaped pieces which are relatively synthesized into a ring shape and are used for being tightly held and fixed on the outer side of a primary winding of a voltage transformer;
openings are formed in the radial outer sides of the circular arc-shaped pieces, and connecting blocks are fixed to the two ends of each circular arc-shaped piece at the bottom of each opening respectively;
one end of the two arc-shaped pieces which are oppositely combined is fixedly connected through a bolt and is mutually conductive; the size of the opening meets the requirement of operating a bolt, and the bolt is immersed in the opening;
one of the two connecting blocks at the end, which corresponds to the nut of the bolt, is provided with a through hole, the other connecting block is provided with a threaded hole matched with the bolt, and the opening of the circular arc-shaped part provided with the through hole is used for the bolt to be installed and penetrates through the through hole to be in threaded connection with the threaded hole;
or, the two connecting blocks at the end are provided with through holes, the bolt is provided with a nut, the openings of the two arc-shaped pieces are respectively used for the bolt and the nut to be installed, 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 radial outer side of the arc-shaped part is provided with an opening, the size of the opening meets the requirement of operating a bolt, the bolt is arranged in the opening of the arc-shaped part with the through hole and penetrates through the through hole to be in threaded connection with the threaded hole so as to realize the fixed connection and mutual conduction of one end of the two arc-shaped parts which are mutually matched, and the bolt for connecting the two arc-shaped parts is positioned in the opening of the arc-shaped part; or the bolt and the nut are respectively installed into the corresponding arc-shaped parts from the openings of the two arc-shaped parts and penetrate the bolt through the two through holes to be in threaded connection with the nut, the bolt and the nut which are connected with the two arc-shaped parts are both positioned inside the openings of the arc-shaped parts, and the electric field of the shielding cover is mainly distributed on the outer peripheral surface of the shielding cover, so that the bolt and the nut which are connected with the two arc-shaped parts cannot influence the distribution of the electric field on the shielding cover, after the two arc-shaped parts are fixedly connected through the bolt and the nut, the shielding pipe does not need to be additionally arranged, 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.
As an optimal technical scheme, the arc-shaped part is a sheet metal part, and two side edges of the opening are folded towards the inner side of the opening.
Has the advantages that: the two sides of the opening are folded towards the inner side of the opening, so that the edges of the two sides of the opening are positioned at the inner side of the opening, and the uniform distribution of an electric field on the shielding cover is facilitated.
As a preferred technical scheme, each circular arc-shaped piece comprises a circular arc-shaped bottom edge and two arc-shaped side edges, the two side edges are arranged on the two axial sides of the bottom edge and positioned on the radial outer side of the bottom edge, the connecting block is fixed on the bottom edge, and the opening is surrounded by the two side edges;
and a conductive tube is fixed on the bottom edge of one of the circular arc-shaped pieces and is used for being spliced 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 shape of the arc-shaped parts enables the electric field on the shielding cover to be mainly distributed on the side edges, and the conducting tube arranged on the outer circumferential surface basically does not influence the distribution of the electric field on the shielding cover.
As a preferred technical scheme, each circular arc-shaped piece comprises a circular arc-shaped bottom edge and two arc-shaped side edges, the two side edges are arranged on the two axial sides of the bottom edge and positioned on the radial outer side of the bottom edge, the connecting block is fixed on the bottom edge, and the opening is surrounded by the two side edges;
and a wire outlet hole is formed in the bottom edge of one of the circular arc-shaped pieces, a binding post is fixed on the outer side of the bottom edge of the circular arc-shaped piece, the binding post is arranged close to the wire outlet hole, and a lead of the primary winding passes through the wire outlet hole and is electrically connected with the binding post.
Has the advantages that: the lead of the primary winding penetrates out of the wire outlet hole and is in conductive connection with the binding post, so that the conductive connection between the lead of the primary winding and the shielding case is realized, 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-shaped parts enables the electric field on the shielding cover to be mainly distributed on the side edges, and the arrangement of the wire outlet holes on the bottom edge does not basically influence the distribution of the electric field on the shielding cover.
The voltage transformer adopts the following technical scheme:
a voltage transformer comprises a transformer body, wherein the transformer body comprises a primary winding and a shielding case arranged outside the primary winding;
the shielding cover comprises two circular arc-shaped pieces 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;
openings are formed in the radial outer sides of the circular arc-shaped pieces, and connecting blocks are fixed to the two ends of each circular arc-shaped piece at the bottom of each opening respectively;
one end of the two arc-shaped pieces which are oppositely combined is fixedly connected through a bolt and is mutually conductive; the size of the opening meets the requirement of operating a bolt, and the bolt is immersed in the opening;
one of the two connecting blocks at the end, which corresponds to the nut of the bolt, is provided with a through hole, the other connecting block is provided with a threaded hole matched with the bolt, and the opening of the circular arc-shaped part provided with the through hole is used for the bolt to be installed and penetrates through the through hole to be in threaded connection with the threaded hole;
or, the two connecting blocks at the end are provided with through holes, the bolt is provided with a nut, the openings of the two arc-shaped pieces are respectively used for the bolt and the nut to be installed, 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 radial outer side of the arc-shaped part is provided with an opening, the size of the opening meets the requirement of operating a bolt, the bolt is arranged in the opening of the arc-shaped part with the through hole and penetrates through the through hole to be in threaded connection with the threaded hole so as to realize the fixed connection and mutual conduction of one end of the two arc-shaped parts which are mutually matched, and the bolt for connecting the two arc-shaped parts is positioned in the opening of the arc-shaped part; or the bolt and the nut are respectively installed into the corresponding arc-shaped parts from the openings of the two arc-shaped parts and penetrate the bolt through the two through holes to be in threaded connection with the nut, the bolt and the nut which are connected with the two arc-shaped parts are both positioned inside the openings of the arc-shaped parts, and the electric field of the shielding cover is mainly distributed on the outer peripheral surface of the shielding cover, so that the bolt and the nut which are connected with the two arc-shaped parts cannot influence the distribution of the electric field on the shielding cover, after the two arc-shaped parts are fixedly connected through the bolt and the nut, the shielding pipe does not need to be additionally arranged, 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.
As an optimal technical scheme, the arc-shaped part is a sheet metal part, and two side edges of the opening are folded towards the inner side of the opening.
Has the advantages that: the two sides of the opening are folded towards the inner side of the opening, so that the edges of the two sides of the opening are positioned at the inner side of the opening, and the uniform distribution of an electric field on the shielding cover is facilitated.
As a preferred technical scheme, each circular arc-shaped piece comprises a circular arc-shaped bottom edge and two arc-shaped side edges, the two side edges are arranged on the two axial sides of the bottom edge and positioned on the radial outer side of the bottom edge, the connecting block is fixed on the bottom edge, and the opening is surrounded by the two side edges;
and a conductive tube is fixed on the bottom edge of one of the circular arc-shaped pieces and is used for being spliced 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 shape of the arc-shaped parts enables the electric field on the shielding cover to be mainly distributed on the side edges, and the conducting tube arranged on the outer circumferential surface basically does not influence the distribution of the electric field on the shielding cover.
As a preferred technical scheme, each circular arc-shaped piece comprises a circular arc-shaped bottom edge and two arc-shaped side edges, the two side edges are arranged on the two axial sides of the bottom edge and positioned on the radial outer side of the bottom edge, the connecting block is fixed on the bottom edge, and the opening is surrounded by the two side edges;
and a wire outlet hole is formed in the bottom edge of one of the circular arc-shaped pieces, a binding post is fixed on the outer side of the bottom edge of the circular arc-shaped piece, the binding post is arranged close to the wire outlet hole, and a lead of the primary winding passes through the wire outlet hole and is electrically connected with the binding post.
Has the advantages that: the lead of the primary winding penetrates out of the wire outlet hole and is in conductive connection with the binding post, so that the conductive connection between the lead of the primary winding and the shielding case is realized, 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-shaped parts enables the electric field on the shielding cover to be mainly distributed on the side edges, and the arrangement of the wire outlet holes on the bottom edge does not basically influence the distribution of the electric field on the shielding cover.
As an optimized technical scheme, one end of the two ends of the two arc-shaped pieces which are combined is close to the bottom shielding plate of the voltage transformer, the other end of the two arc-shaped pieces which are combined is far away from the bottom shielding plate of the voltage transformer, and one end of the bottom shielding plate which is far away from the voltage transformer is arranged to be deviated from the bottom shielding plate of the voltage transformer in the vertical direction.
Has the advantages that: keep away from the end shield plate setting of voltage transformer's end shield plate setting and skew voltage transformer's end shield plate setting in vertical direction, can prevent end shield plate influence shield cover assembly on primary winding, further improve 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 a schematic view of the electrical connection ends of the two circular arc members in FIG. 1;
FIG. 4 is a schematic view of the insulated connecting ends of the two arc-shaped members of FIG. 2;
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 perspective view of the first arcuate member of FIG. 1;
FIG. 9 is a front view of the first arcuate member of FIG. 1;
FIG. 10 is a perspective view of the second arcuate member of FIG. 1;
FIG. 11 is a front view of the second arcuate member of FIG. 1;
fig. 12 is a perspective view of an embodiment of the voltage transformer of the present invention (only the body and the bottom plate are shown, the housing and the basin insulator are not shown);
FIG. 13 is a perspective view of a single phase voltage transformer of FIG. 12;
fig. 14 is a front view of the single-phase voltage transformer of fig. 12.
In the figure: 1-a first circular arc-shaped piece; 2-a second circular arc-shaped piece; 3-a first bolt; 4-an insulating sleeve; 5-an insulating plate; 6-a second bolt; 7-a binding post; 8-wire outlet holes; 9-a conductive tube; 10-bottom edge; 11-a first perforation; 12-a first threaded hole; 13-a first electrical connection block; 14-a first insulating connection block; 15-lateral; 21-second perforation; 22-a second threaded hole; 23-a second electrical connection block; 24-a second insulating connection block; 41-sleeve body; 42-an insulating disk; 51-perforation; 100-a primary winding; 101-side shielding plate; 102-a bottom shield plate; 103-a backplane.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
In the specific embodiment of the shielding case of the invention, the shielding case in the embodiment is used in a sulfur hexafluoride gas insulation three-phase voltage transformer product, as shown in fig. 1 to 4, the shielding case is in a two-piece type, and comprises two circular arc-shaped parts which are relatively synthesized into a ring shape, namely a first circular arc-shaped part 1 and a second circular arc-shaped part 2, and the radial outer sides of the two circular arc-shaped parts are both provided with openings. The first arc-shaped part 1 and the second arc-shaped part 2 are sheet metal parts and comprise arc-shaped bottom edges 10 and two arc-shaped side edges 15, the two side edges 15 are arranged on two axial sides of the bottom edges 10 and located on the radial outer sides of the bottom edges 10, the two side edges 15 are folded towards the inner sides of the opening, the opening is enclosed by the two side edges 15, the bottom edges 10 are located at the bottom of the opening, an electric field on the shielding cover is mainly distributed on the two side edges 15, and then parts arranged inside the opening and on the bottom edges 10 basically cannot influence the distribution of the electric field on the shielding cover. As shown in fig. 13 and 14, when the shield case is attached to the outside of the primary winding 100 of the voltage transformer, the two circular arc-shaped members are held tightly and fixed to the outside of the primary winding 100.
As shown in fig. 8 and 9, two ends of the first arc-shaped member 1 and the second arc-shaped member 2 are respectively an electrical connection end and an insulation connection end, and two ends of the first arc-shaped member 1 are respectively welded and fixed with connection blocks on the bottom side 10, wherein the connection block corresponding to the electrical connection end is a first electrical connection block 13, and the connection block corresponding to the insulation connection end is a first insulation connection block 14; as shown in fig. 10 and 11, two ends of the second arc-shaped member 2 are respectively welded and fixed with connection blocks on the bottom side 10, wherein the connection block corresponding to the electrical connection end is a second electrical connection block 23, and the connection block corresponding to the insulating connection end is a second insulating connection block 24. The first insulating connecting block 14 and the second insulating connecting block 24 are made of metal materials, and the insulating connecting blocks are only mutually insulated and connected. The first electrical connection block 13, the first insulation connection block 14, the second electrical connection block 23, and the second insulation connection block 24 are rectangular blocks.
As shown in fig. 3, the electric connection ends of the first arc-shaped part 1 and the second arc-shaped part 2 are combined relatively and fixedly connected through the first bolt 3 and are electrically conductive to each other, the size of the upper opening of the two arc-shaped parts meets the requirement of operating the first bolt 3, and the first bolt 3 is immersed in the opening of the two arc-shaped parts so as to avoid influencing the distribution of the electric field on the shielding case. As shown in fig. 8, the first electrical connection block 13 is provided with a through hole, i.e., the first through hole 11; as shown in fig. 11, the second electrical connection block 23 is provided with a screw hole, i.e., a second screw hole 22. The first bolt 3 is installed in the first arc-shaped part 1 through the opening of the first arc-shaped part 1, the stud of the first bolt 3 penetrates through the first through hole 11 to be in threaded connection with the second threaded hole 22, the nut of the first bolt 3 is located in the first arc-shaped part 1 and is in stop fit with the first electric connecting block 13 to achieve fixed connection of the two arc-shaped parts, and the circuit and the magnetic circuit between the two petals are ensured to be conducted. The thickness of the second electrical connection block 23 is greater than that of the first electrical connection block 13, so that a long threaded hole is formed in the second electrical connection block 23, and stable connection of the first bolt 3 is guaranteed.
As shown in fig. 4, the insulated connecting ends of the first and second arc-shaped pieces 1 and 2 are relatively combined and fixedly connected by a second bolt 6, and the second bolt 6 is a metal bolt and is a hexagon socket pan head bolt. The size of the upper openings of the two arc-shaped parts meets the requirement of operating the second bolt 6, and the second bolt 6 is immersed in the openings of the two arc-shaped parts so as to avoid influencing the distribution of the electric field on the shielding cover. As shown in fig. 8, the first insulating connection block 14 is provided with a threaded hole to be engaged with the second bolt 6, i.e., the first threaded hole 12; as shown in fig. 11, the second insulating connecting block 24 is provided with a through hole, i.e., a second through hole 21, which is engaged with the second bolt 6.
An insulating plate 5 shown in fig. 5 and 6 is further arranged between the two insulating connecting blocks, the shape of the insulating plate 5 is matched with that of any insulating connecting block, and a through hole 51 for the second bolt 6 to pass through is formed in the insulating plate 5; the second bolt 6 is sleeved with the insulating sleeve 4 shown in fig. 7, 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 the present embodiment. When second bolt 6 threaded connection is on second screw hole 22, the insulating link of two circular arc shape pieces merges fixed connection relatively, insulation board 5 presss from both sides between the insulating connecting block of two circular arc shape pieces this moment, insulating cover 4 cover is established on second bolt 6, and insulating disc 42 presss from both sides between the medial surface of second insulating connecting block 24 and the nut of second bolt 6, realize the insulation between first insulating connecting block 14 and the second insulating connecting block 24, thereby realize that circuit and magnetic circuit between first circular arc shape piece 1 and the second circular arc shape piece 2 break, can not form electric field, magnetic field closed loop between the two lamella of messenger's shield cover.
Above-mentioned second bolt 6 is as the main atress part of the insulating link of connecting two circular arc shape pieces, insulation board 5 and insulating cover 4 mainly play the mutual insulating effect between the two circular arc shape pieces 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 shape pieces of this end yet, and second bolt 6 is the 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 shape pieces, and then improve voltage transformer's performance.
When carrying out the fixed connection of the insulating link of first circular arc spare 1 and second circular arc spare 2, with 5 centre gripping of insulation board between two insulating connecting blocks, insulating cover 4 suit is on the double-screw bolt of second bolt 6, the second bolt 6 that the cover was equipped with insulating cover 4 is packed into in second circular arc spare 2 and is perforated 21 from the second from the opening of second circular arc spare 2, perforation 51 is worn out, through outer hexagonal spanner with 6 threaded connection of second bolt on first screw hole 12, realize the fixed connection of the insulating link of two circular arc spares. The thickness of the first insulation connection block 14 is greater than that of the second electrical connection block 24, so that a long threaded hole is formed in the first insulation connection block 14, and stable connection of the second bolt 6 is guaranteed.
As shown in fig. 10 and 11, a wire outlet hole 8 is formed in a bottom side 10 of the second circular arc-shaped piece 2, as shown in fig. 2, a terminal 7 is welded on an outer side of the bottom side 10 of the second circular arc-shaped piece 2, the terminal 7 is arranged close to the wire outlet hole 8, and a lead of the primary winding 100 penetrates through the wire outlet hole 8 and is electrically connected with the terminal. Specifically, the wiring terminal 7 is provided with a threaded hole, a lead of the primary winding 100 penetrates out of the wire outlet hole 8, then a wire nose is wound at the end of the lead, the wire nose is arranged on a metal bolt matched with the threaded hole in a penetrating mode, then the metal bolt is in threaded connection with the threaded hole of the wiring terminal 7, and the primary winding 100 is electrically connected with the shielding case.
As shown in fig. 1, the outer circumference of the second arc-shaped part 2 is welded with a conductive tube 9, and the length and diameter of the conductive tube 9 can be adapted according to the product structure. As shown in fig. 12, the body of each phase voltage transformer is arranged in a delta shape, and the conductive tubes 9 of each phase voltage transformer are bent conductive tubes, so that the distance between the upper ends of the conductive tubes 9 of the three-phase voltage transformer is adapted to the distance between the central conductors of the three-phase basin-type insulator. When the product is assembled, the conductive tube 9 corresponding to the central conductor of the three-phase basin-type insulator is directly inserted into the electric connection contact of the central conductor of the basin-type insulator, so that equipotential among the three-phase 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 arc-shaped part 1 and the second arc-shaped part 2 in the embodiment are both semi-circular arc-shaped parts.
When the sulfur hexafluoride gas insulation three-phase voltage transformer product is assembled, the shielding case can meet the requirements of convenient assembly and reliable quality of the voltage transformer. Furthermore, the terminal post 7 and the conductive tube 9 are both arranged on the outer side of the bottom edge 10 of the second circular arc-shaped part 2, and the electric field on the shield is mainly distributed on the two side edges 15, so that the distribution of the electric field on the shield is not affected by the terminal post 7 and the conductive tube 9.
In other embodiments, the shielding case can also be used in sulfur hexafluoride gas insulation single-phase voltage transformer products, and at this time, the conductive tube of the voltage transformer can be a straight tube, and only the conductive tube needs to be ensured to be inserted with the central conductor of the basin-type insulator of the voltage transformer.
In other embodiments, the first bolt may also be provided with a nut, at this time, the two electrical connection blocks are both provided with through holes, the openings of the two arc-shaped members are respectively used for the first bolt and the nut to be installed, and the first bolt penetrates through the two through holes to be in threaded connection with the nut, so that the electrical connection ends of the two arc-shaped members are fixedly connected and are electrically conductive with each other.
In other embodiments, the two arc-shaped members may also be formed by welding, that is, two side edges of the arc-shaped members are fixed to two axial sides of the bottom edge by welding, and the edges of the two side edges are provided with a fillet structure, so that the electric field is uniformly distributed on the two side edges of the shielding case.
In other embodiments, the conductive tube and the center conductor of the basin-type insulator can also be electrically connected through a flexible wire; or a threaded hole which is through along the radial direction of the second circular arc-shaped part is directly arranged on the bottom edge of the second circular arc-shaped part, a metal bolt is connected to the threaded hole, and a lead of the primary winding is in conductive connection with the shielding case through the metal bolt.
In other embodiments, the main body of the two arc-shaped members can be sized according to the requirement, for example, the first arc-shaped member is a quarter arc-shaped member, the second arc-shaped member is a quarter arc-shaped member, and the two arc-shaped members are combined into a ring.
In other embodiments, the insulating connection ends of the two arc-shaped members can also be connected by the insulating plate disclosed in the utility model with the publication number CN201601013U, that is, through holes are respectively formed on the first insulating connection block and the second insulating connection block, and the insulating plate passes through the two through holes and is fixedly connected with the corresponding arc-shaped members by nylon bolts.
In a specific embodiment of the voltage transformer of the present invention, the voltage transformer is a sulfur hexafluoride gas-insulated three-phase voltage transformer, as shown in fig. 12 to 14, the voltage transformer includes a bottom plate 103, bodies of the phase voltage transformers are arranged in a delta shape and are all fixed on the bottom plate 103, the bodies of the phase voltage transformers have the same structure, each body includes a primary winding 100 and a shield disposed outside the winding on one side, both sides of the primary winding 100 are provided with side shield plates 101, and the bottom of the primary winding 100 is further provided with a bottom shield plate 102. The electric connection blocks of the two arc-shaped parts are arranged close to the top of the transformer body, the insulating connection blocks are arranged close to the bottom of the transformer body, and the insulating connection blocks are arranged to deviate from the bottom shielding plate 102 in the vertical direction so as to prevent the bottom shielding plate 102 from influencing 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 wire outlet hole 8 and is connected to the binding post 7 through a metal bolt thread, so that the primary winding 100 is electrically connected with the shielding case; the first bolt 3 passes through the first through hole 11 and is in threaded connection with the second threaded hole 22, so that the two petals forming the shielding cover are electrically connected; the insulating plate 5 is clamped between the insulating connecting blocks of the two arc-shaped pieces, the insulating sleeve 4 is sleeved on the second bolt 6, and the second bolt 6 passes through the second through hole 21 and the through hole 51 to be in threaded connection with the first threaded hole 12, so that the two pieces are fixedly connected and the circuit and the magnetic circuit are disconnected; the conductive tube 9 is inserted into the electric connection contact of the central conductor of the three-phase basin-type insulator, so that the equipotential connection of the primary winding 100, the shielding case and the central conductor of the basin-type insulator is realized.
In other embodiments, the electrical connection blocks of the two arc-shaped members may be disposed near the bottom of the body, the insulating connection block may be disposed near the top of the body, and the electrical connection blocks may be disposed off the bottom shielding plate in the vertical direction.

Claims (9)

1. A shielding case is characterized by comprising two arc-shaped pieces 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 a voltage transformer;
openings are formed in the radial outer sides of the circular arc-shaped pieces, and connecting blocks are fixed to the two ends of each circular arc-shaped piece at the bottom of each opening respectively;
the two ends of the arc-shaped piece are respectively an electric connection end and an insulation connection end;
the insulation connecting ends of the two arc-shaped pieces are oppositely combined and fixedly connected, and the two arc-shaped pieces are insulated from each other at the insulation connecting ends;
the electric connection ends of the two arc-shaped pieces which are oppositely combined are fixedly connected through bolts and are mutually conductive; the size of the opening meets the requirement of operating a bolt, and the bolt is immersed in the opening;
one of the two connecting blocks at the electric connecting ends of the two arc-shaped pieces which are mutually jointed is provided with a through hole corresponding to the nut of the bolt, the other connecting block is provided with a threaded hole matched with the bolt, and the opening of the arc-shaped piece provided with the through hole is used for the bolt to be installed and penetrates through the through hole to be in threaded connection with the threaded hole;
or, through holes are arranged on the two connecting blocks at the electric connecting ends of the two arc-shaped pieces which are mutually matched, the bolt is provided with a nut, the openings of the two arc-shaped pieces are respectively used for the bolt and the nut to be installed, and the bolt penetrates through the two through holes to be in threaded connection with the nut.
2. The shield according to claim 1, wherein the arc-shaped member is a sheet metal member, and both sides of the opening are folded inward of the opening.
3. The shielding cage according to claim 1 or 2, wherein each of the arc-shaped members includes a circular arc-shaped bottom side and two arc-shaped side edges, the two side edges being disposed on both axial sides of the bottom side and radially outside the bottom side, the connecting block being fixed to the bottom side, the opening being defined by the two side edges;
and a conductive tube is fixed on the bottom edge of one of the circular arc-shaped pieces and is used for being spliced with the central conductor of the basin-type insulator.
4. The shielding cage according to claim 1 or 2, wherein each of the arc-shaped members includes a circular arc-shaped bottom side and two arc-shaped side edges, the two side edges being disposed on both axial sides of the bottom side and radially outside the bottom side, the connecting block being fixed to the bottom side, the opening being defined by the two side edges;
and a wire outlet hole is formed in the bottom edge of one of the circular arc-shaped pieces, a binding post is fixed on the outer side of the bottom edge of the circular arc-shaped piece, the binding post is arranged close to the wire outlet hole, and a lead of the primary winding passes through the wire outlet hole and is electrically connected with the binding post.
5. A voltage transformer comprises a transformer body, wherein the transformer body comprises a primary winding and a shielding case arranged outside the primary winding;
the transformer is characterized in that the shielding cover comprises two circular arc-shaped pieces 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 a voltage transformer;
openings are formed in the radial outer sides of the circular arc-shaped pieces, and connecting blocks are fixed to the two ends of each circular arc-shaped piece at the bottom of each opening respectively;
the two ends of the arc-shaped piece are respectively an electric connection end and an insulation connection end;
the insulation connecting ends of the two arc-shaped pieces are oppositely combined and fixedly connected, and the two arc-shaped pieces are insulated from each other at the insulation connecting ends;
the electric connection ends of the two arc-shaped pieces which are oppositely combined are fixedly connected through bolts and are mutually conductive; the size of the opening meets the requirement of operating a bolt, and the bolt is immersed in the opening;
one of the two connecting blocks at the electric connecting ends of the two arc-shaped pieces which are mutually jointed is provided with a through hole corresponding to the nut of the bolt, the other connecting block is provided with a threaded hole matched with the bolt, and the opening of the arc-shaped piece provided with the through hole is used for the bolt to be installed and penetrates through the through hole to be in threaded connection with the threaded hole;
or, through holes are arranged on the two connecting blocks at the electric connecting ends of the two arc-shaped pieces which are mutually matched, the bolt is provided with a nut, the openings of the two arc-shaped pieces are respectively used for the bolt and the nut to be installed, 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 arc-shaped member is a sheet metal member, and both sides of the opening are folded inward of the opening.
7. The voltage transformer according to claim 5 or 6, wherein each of the arc-shaped members includes a circular arc-shaped bottom side and two arc-shaped side edges, the two side edges are disposed on both axial sides of the bottom side and radially outside the bottom side, the connecting block is fixed on the bottom side, and the opening is surrounded by the two side edges;
and a conductive tube is fixed on the bottom edge of one of the circular arc-shaped pieces and is used for being spliced 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 members includes a circular arc-shaped bottom side and two arc-shaped side edges, the two side edges are disposed on both axial sides of the bottom side and radially outside the bottom side, the connecting block is fixed on the bottom side, and the opening is surrounded by the two side edges;
and a wire outlet hole is formed in the bottom edge of one of the circular arc-shaped pieces, a binding post is fixed on the outer side of the bottom edge of the circular arc-shaped piece, the binding post is arranged close to the wire outlet hole, and a lead of the primary winding passes through the wire outlet hole and is electrically connected with the binding post.
9. The voltage transformer according to claim 5 or 6, wherein one of the two ends of the two arc-shaped members facing each other is disposed close to the bottom shield of the voltage transformer, the other end is disposed away from the bottom shield of the voltage transformer, and the end disposed away from the bottom shield of the voltage transformer is disposed vertically away from the bottom shield of the voltage transformer.
CN201910610774.9A 2019-07-08 2019-07-08 Voltage transformer and shielding case thereof Active CN110619997B (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08153640A (en) * 1994-11-28 1996-06-11 Ngk Insulators Ltd Insulator molding method and die of split current transformer
JPH09213551A (en) * 1996-01-29 1997-08-15 Toko Denki Kk Current transformer
JP2000348957A (en) * 1999-06-02 2000-12-15 Mitsubishi Electric Corp Zero-phase sequence current transformer
EP1595158A1 (en) * 2003-02-21 2005-11-16 Liaisons Electroniques-Mecaniques Lem S.A. Magnetic field sensor and electrical current sensor therewith
CN201601013U (en) * 2009-11-26 2010-10-06 平高集团有限公司 Voltage transformer and shielding case thereof
CN203433986U (en) * 2013-08-29 2014-02-12 宁波恒力达科技有限公司 Outdoor low-voltage open-close type combined mutual inductor
EP2960659A1 (en) * 2014-06-27 2015-12-30 Efore OYJ An electrical energy meter and a method for installing it
CN207397930U (en) * 2017-10-13 2018-05-22 张一飞 A kind of novel open-close type current transformer

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08153640A (en) * 1994-11-28 1996-06-11 Ngk Insulators Ltd Insulator molding method and die of split current transformer
JPH09213551A (en) * 1996-01-29 1997-08-15 Toko Denki Kk Current transformer
JP2000348957A (en) * 1999-06-02 2000-12-15 Mitsubishi Electric Corp Zero-phase sequence current transformer
EP1595158A1 (en) * 2003-02-21 2005-11-16 Liaisons Electroniques-Mecaniques Lem S.A. Magnetic field sensor and electrical current sensor therewith
CN201601013U (en) * 2009-11-26 2010-10-06 平高集团有限公司 Voltage transformer and shielding case thereof
CN203433986U (en) * 2013-08-29 2014-02-12 宁波恒力达科技有限公司 Outdoor low-voltage open-close type combined mutual inductor
EP2960659A1 (en) * 2014-06-27 2015-12-30 Efore OYJ An electrical energy meter and a method for installing it
CN207397930U (en) * 2017-10-13 2018-05-22 张一飞 A kind of novel open-close type current transformer

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