Transformer ascending flanged base

Abstract

The invention provides a transformer ascending flanged base which comprises a lower ascending flanged base, an upper ascending flanged base and a sleeve mounting flange which are sequentially arranged from bottom to top, the lower ascending flanged base is arranged on the edge of a tank cover of a transformer oil tank and is connected with the tank cover in a welded mode, four stacked current transformers are arranged in the upper ascending flanged base, and the four current transformers are isolated through insulating washers; insulation end rings are arranged at the bottoms and the tops of the four current transformers, each insulation end ring comprises an insulation end plate and insulation cushion blocks, the insulation end plates abut against the current transformers, and the multiple insulation cushion blocks are arranged on the sides, away from the current transformers, of the insulation end plates; and the sleeve mounting flange is pressed above the insulating washer at the top, and the top of the sleeve mounting flange is provided with an air guide pipe joint communicated with the interior of the lifting seat. The structure is simple, a plurality of TPY current transformers can be arranged in one low-voltage sleeve ascending flanged base in a centralized mode, the size of an oil tank does not need to be increased, cost is saved, and market competitiveness is improved.

Description

Technical Field

[0001] The invention relates to the technical field of transformers, and in particular to a transformer elevation seat. Background Art

[0002] At present, bushing current transformers are indispensable in power transformers. 500kV transformers are usually designed as single-phase type, and each single-phase transformer is equipped with a high-voltage bushing and its riser, a medium-voltage bushing and its riser, a neutral point bushing and its riser, and a low-voltage bushing and its riser. Usually, four current transformers are installed in the low-voltage bushing, including two transient protection level LRBT (TPY), one protection level LRB, and one measurement level LR. And one TPY plus one LRB is set on one low-voltage bushing, and one TPY plus one LR is set on another low-voltage bushing; in addition, sometimes two TPYs are set on one of the low-voltage bushings or all four CTs are placed on one low-voltage bushing. However, under normal circumstances, the installation length of the CT of the low-voltage bushing cannot be too long, which limits the total installation height of the riser CT, and the installation interface between the low-voltage bushing and the box cover cannot be too large, which will affect the overall size of the oil tank. The TPY transformer is large in size, and the conventional riser cannot meet the requirements, which brings great problems to the design. Summary of the invention

[0003] The present invention aims to provide a transformer lifting stand to overcome the deficiencies in the prior art.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a transformer riser, comprising a lower riser, a riser, and a bushing mounting flange arranged in sequence from bottom to top, the lower riser is arranged on the transformer oil tank cover, the cover is provided with an opening for a sealing strip arranged near the edge of the cover, the lower end of the lower riser is inserted in the opening and is welded to the cover, the riser is connected to the lower riser through a fastener, four stacked current transformers are arranged in the riser, the four current transformers are isolated by insulating washers, and the bottoms and An insulating end ring is also provided on the top, and the insulating end ring includes an insulating end plate and an insulating pad. The insulating end plate is in contact with the current transformer. The insulating pad is arranged on the side of the insulating end plate away from the current transformer, and there are multiple insulating pads, which are evenly distributed around the central circumference of the lower riser. The bushing mounting flange is pressed above the insulating gasket at the top and connected to the riser through fasteners. An air duct joint connected to the inside of the riser is provided on the top of the bushing mounting flange. The low-voltage bushing is installed on the bushing mounting flange and passes through between the four current transformers and is arranged in the oil tank.

[0005] Furthermore, the above-mentioned transformer riser is provided with a wiring flange in the middle of the outer side of the riser, and a junction box is installed on the wiring flange.

[0006] Furthermore, the above-mentioned transformer riser is provided with an annular support plate at the lower end inside the riser, and the support plate is used to support the current transformer located in the riser, and the insulating end ring located at the bottom of the current transformer is arranged above the support plate.

[0007] Furthermore, the above-mentioned transformer lifting seat, the lower lifting seat includes a lower wall tube and an upper flange, the lower end of the lower wall tube is inserted into the opening and embedded in the box cover and welded, the upper end of the lower wall tube is inserted into the through hole in the middle of the upper flange and embedded in the upper flange, and the embedding height of the lower end of the lower wall tube is greater than 2 / 3 of the thickness of the box cover, and the embedding height of the upper end is greater than 2 / 3 of the thickness of the upper flange.

[0008] Furthermore, in the above-mentioned transformer riser, the diameter of the lower wall tube is the minimum size to ensure the live insulation distance of the low-voltage bushing, the height of the lower wall tube is the minimum size to ensure the welding of the box cover or the installation of the box cover bolts, and the lower riser is about 100mm higher than the tank cover.

[0009] Furthermore, the above-mentioned transformer lifting seat includes an upper wall tube and an upper flange 2 and a lower flange arranged at the upper and lower ends of the upper wall tube, the upper end of the upper wall tube is inserted into the middle through hole of the upper flange 2 and is inlaid and welded therewith, the lower end of the upper wall tube is inserted into the middle through hole of the lower flange and is inlaid and welded therewith, and the embedding height of the upper end of the upper wall tube is greater than 2 / 3 of the thickness of the upper flange 2, and the embedding height of the lower end is greater than 2 / 3 of the thickness of the lower flange.

[0010] Furthermore, in the above-mentioned transformer riser, the lower flange and the upper flange are provided with a plurality of corresponding mounting holes 1, and the two are connected by a fastener passing through the mounting hole 1; the upper flange 2 and the bushing mounting flange are provided with a plurality of corresponding mounting holes 2, and the two are connected by a fastener passing through the mounting hole 2.

[0011] Furthermore, in the above-mentioned transformer riser, the top surfaces of the upper flange 1 and the upper flange 2 are both provided with an annular sealing groove, the sealing groove is arranged close to the upper wall tube, and is located on the inner side of the mounting hole 1 and the mounting hole 2, and a sealing ring is inlaid in the sealing groove.

[0012] Furthermore, in the above-mentioned transformer riser, the insulating spacers are fan-shaped, at least three of them are provided, and both the inner arc and the outer arc of the insulating spacers do not protrude from the current transformer.

[0013] Furthermore, in the above-mentioned transformer lifting base, a paper groove and a support bar are also provided in the upper wall tube, and a plurality of grooves evenly distributed around the circumference are provided on the insulating end plate. The paper groove is inserted in the groove, and the upper end of the paper groove extends out of the insulating end plate located at the top, and the lower end extends out of the insulating end plate located at the bottom. The support bar is inserted in the paper groove, one side abuts against the bottom surface of the paper groove, and the other side abuts against the inner side surface of the upper wall tube, so as to press the current transformer.

[0014] Furthermore, in the above-mentioned transformer elevating seat, the grooves and the insulating spacers are arranged in one-to-one correspondence, and the distance from the bottom surface of the groove to the center of the insulating end plate is smaller than the radius of the outer arc of the insulating spacer.

[0015] Furthermore, in the above-mentioned transformer riser, the air duct joint is connected to the interior of the riser through an air duct hole provided on the top of the bushing mounting flange, one end of the air duct joint is a connecting end welded to the top surface of the bushing mounting flange, and the other end is connected to the main air channel of the transformer body, the connecting end is a round tube with a notch at the lower end, the bottom surface of the notch abuts against the top surface of the bushing mounting flange, and the notch is arranged toward the air duct hole, covering the air duct hole; the air duct hole is arranged close to the inner side surface of the upper wall tube, and the air duct hole is arranged between adjacent insulating pads.

[0016] Compared with the prior art, the beneficial effects of the present invention are: the present invention has a simple structure, a reasonable design, simplifies the riser structure and the air duct structure, and can centrally arrange multiple TPY current transformers in a low-voltage bushing riser without increasing the oil tank size, which is beneficial to reducing the oil tank size, saving costs, and improving the market competitiveness of transformer products. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of the transformer riser of the present invention;

[0019] Figure 2 It is a partial structural schematic diagram of the transformer riser of the present invention;

[0020] Figure 3 It is a schematic diagram of the insulating end ring structure of the transformer riser of the present invention;

[0021] Figure 4 A top view of the bushing mounting flange of the transformer riser of the present invention;

[0022] Figure 5 This is a schematic diagram of the installation of the transformer riser of the present invention;

[0023] In the figure: 100, low pressure booster seat;

[0024] 1. Lower raised seat; 11. Lower wall tube; 12. Upper flange 1; 13. Sealing groove;

[0025] 2. Rising seat; 21. Upper wall tube; 22. Upper flange 2; 23. Lower flange; 24. Support plate; 25. Wiring flange; 26. Junction box;

[0026] 3. Casing mounting flange; 31. Air pipe joint; 311. Connection end; 32. Air guide hole;

[0027] 4. Current transformer; 5. Insulating gasket; 6. Insulating end ring; 61. Insulating end plate; 611. Groove; 62. Insulating spacer; 7. Paper slot; 8. Stay;

[0028] 9. Oil tank; 91. Tank cover; 92. Opening; 10. Low-pressure bushing. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example 1

[0031] like Figure 1-5As shown, a transformer riser 100 is arranged at the corner edge of the transformer oil tank 9, including a lower riser 1, a riser 2, and a bushing mounting flange 3 arranged in sequence from bottom to top, the lower riser 1 is arranged on the box cover 91 of the oil tank 9, and the box cover 91 is provided with an opening 92 for setting a sealing strip near the edge of the box cover 91, the lower end of the lower riser 1 is inserted into the opening 92 and is welded to the box cover 91, the riser 2 is connected to the lower riser 1 by fasteners, and four stacked current transformers 4 are arranged in the riser 2, which are LR, LRB, LRBT, LRBT from bottom to top, and the lower end of the upper wall tube 21 of the riser 2 is provided with The annular support plate 24 is used to support the current transformer 4 located in the raised seat 2; the four current transformers 4 are isolated by insulating washers 5, and the bottom and top of the four current transformers 4 are also provided with insulating end rings 6, and the insulating end rings 6 located at the bottom of the current transformer 4 are arranged above the support plate 24; the bushing mounting flange 3 is pressed above the insulating washer 6 located at the top, and is connected to the raised seat 2 through fasteners, and the top of the bushing mounting flange 3 is provided with an air duct joint 31 connected to the inside of the raised seat 2; the low-voltage bushing 10 is installed on the bushing mounting flange 3, and passes through between the four current transformers 4 and extends into the oil tank 9. The low-voltage bushing raised seat of the present invention can place multiple TPY current transformers without increasing the size of the oil tank, simplifies the structure of the raised seat and the air duct structure, has a simple structure, and is reasonably designed, which is conducive to reducing the size of the oil tank and saving costs. It should be noted that the present invention is also applicable to conventional low-voltage bushing raised seats.

[0032] In the above structure, if Figure 1-3 As shown, the insulating end ring 6 includes an insulating end plate 61 and an insulating pad 62. The insulating end plate 61 abuts against the current transformer 4. The insulating pad 62 is arranged on the side of the insulating end plate 51 away from the current transformer 4. The insulating pad 62 is fan-shaped, and at least three are arranged, which are evenly distributed around the central circumference of the lifting seat 2. The inner and outer arcs of the insulating pad 62 do not protrude from the current transformer 4, which can level the CT, and after gas is generated, the gas can be smoothly discharged. The insulating gasket 5 and the insulating end plate 61 are made of insulating thin cardboard, which is light and thin, and the insulating pad 62 is made of insulating cardboard.

[0033] In addition, in order to improve the gas conduction effect, the gas is most effectively conducted out, such as Figure 1 , 4As shown, the air guide pipe joint 31 is connected to the inside of the rising seat 2 through the air guide hole 32 provided on the top of the sleeve mounting flange 3. One end of the air guide pipe joint 31 is a connection end 311 welded to the top surface of the sleeve mounting flange 3, and the other end is connected to the main air channel of the transformer body, and finally reaches the oil storage cabinet through the gas relay. The connection end 311 is a round tube with a notch at the lower end. The bottom surface of the notch abuts against the top surface of the sleeve mounting flange 3, and the notch is arranged toward the air guide hole 32, covering the air guide hole 32; and the air guide hole 32 is arranged close to the inner side surface of the upper wall tube 21, and the air guide hole 32 is arranged between adjacent insulating pads 62, so that there is an air guide space between the bottom surface of the sleeve mounting flange 3 and the insulating end plate 61, which can prevent the air guide hole 32 from being blocked. The air guide structure is simple and the air guide effect is good.

[0034] In order to facilitate the CT lead out, such as Figure 2 As shown, a wiring flange 25 is further provided in the middle of the outer side of the lifting seat 2 , and a wiring box 26 is installed on the wiring flange 25 .

[0035] Example 2

[0036] Based on the structure of Example 1, Figure 1 As shown, the lower elevated seat 1 includes a lower wall tube 11 and an upper flange 12. The lower end of the lower wall tube 11 is inserted into the opening 92 and is inlaid and welded with the box cover 91. The upper end of the lower wall tube 11 is inserted into the through hole in the middle of the upper flange 12 and is inlaid and welded with the upper flange 12. In order to ensure the welding strength, the inlay height of the lower end of the lower wall tube 11 is greater than 2 / 3 of the thickness of the box cover 91, and the inlay height of the upper end is greater than 2 / 3 of the thickness of the upper flange 12.

[0037] In addition, the diameter of the lower wall tube 11 is the minimum size to ensure the live insulation distance of the low-voltage bushing 10, so that the size of the box cover opening 92 is small, so that the opening 92 is within the effective sealing range of the box edge sealing strip; the height of the lower wall tube 11 is the minimum size to ensure the box edge welding or box edge bolt installation of the box cover 91, and the size is as small as possible to reduce its height above the box cover 91. Specifically, the lower riser 1 is 80-120mm higher than the box cover 91.

[0038] like Figure 1 , 2 As shown, the rising seat 2 includes an upper wall tube 21 and an upper flange 22 and a lower flange 23 arranged at the upper and lower ends of the upper wall tube 21. The upper end of the upper wall tube 21 is inserted into the middle through hole of the upper flange 22 and is inlaid and welded therewith, and the lower end of the upper wall tube 21 is inserted into the middle through hole of the lower flange 23 and is inlaid and welded therewith. In order to ensure the welding strength, the embedding height of the upper end of the upper wall tube 21 is greater than 2 / 3 of the thickness of the upper flange 22, and the embedding height of the lower end is greater than 2 / 3 of the thickness of the lower flange 23; and the outer diameter of the upper wall tube 21 is greater than the outer diameter of the lower wall tube 11.

[0039] Among them, Figure 1 , 4 As shown, the lower flange 23 and the upper flange 12 are provided with corresponding multiple mounting holes 1, and the two are connected by fasteners passing through the mounting holes 1; the upper flange 22 and the sleeve mounting flange 3 are provided with corresponding multiple mounting holes 2, and the two are connected by fasteners passing through the mounting holes 2, which makes disassembly and assembly convenient and simple, and the lifting seat 2 can be disassembled for transportation during transportation, which has good flexibility.

[0040] In addition, if Figure 2 , 3 As shown, the upper wall tube 21 is also provided with a paper groove 7 and a support bar 8. The insulating end plate 61 is provided with a plurality of grooves 611 evenly distributed around the circumference. The paper groove 7 is inserted into the groove 611, and the upper end of the paper groove 7 extends out of the insulating end plate 61 at the top, and the lower end extends out of the insulating end plate 61 at the bottom. The support bar 8 is inserted into the paper groove 7, one side abuts against the bottom surface of the paper groove 7, and the other side abuts against the inner side surface of the upper wall tube 21, which is used to press the current transformer 4 so that the current transformer 4 is firmly fixed in the rising seat 2 to ensure the working stability of the CT. Among them, the support bar 8 is made of laminated paperboard, and the thickness can be adjusted according to actual conditions. The groove 611 is set one-to-one with the insulating pad 62, and the distance from the bottom surface of the groove 611 to the center of the insulating end plate 61 is less than the radius of the outer arc of the insulating pad 62.

[0041] like Figure 1 , 2 As shown, in order to ensure the sealing effect of the lifting seat, the top surfaces of the upper flange 12 and the upper flange 2 22 are provided with an annular sealing groove 13, and the sealing groove 13 is arranged close to the upper wall tube 21 and is located on the inner side of the mounting hole 1 and the mounting hole 2, and a sealing ring is inlaid in the sealing groove 13.

[0042] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0043] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A transformer riser, characterized in that: It includes a lower rising seat, a rising seat, and a bushing mounting flange which are arranged in sequence from bottom to top, the lower rising seat being arranged on the transformer oil tank cover, the cover being provided with an opening for a sealing strip near the edge of the cover, the lower end of the lower rising seat being inserted into the opening and being welded to the cover, the rising seat being connected to the lower rising seat through fasteners, four stacked current transformers being arranged in the rising seat, the four current transformers being isolated by insulating gaskets, and insulating end rings being arranged at the bottom and top of the four current transformers, the insulating end rings comprising an insulating end plate and an insulating pad, the insulating end plate being in contact with the current transformer, the insulating pad being arranged on a side of the insulating end plate away from the current transformer, and a plurality of insulating pads being arranged, which are evenly distributed around the central circumference of the lower rising seat; the bushing mounting flange being pressed above the insulating gasket at the top, and being connected to the rising seat through fasteners, and an air duct joint communicating with the interior of the rising seat being arranged at the top of the bushing mounting flange.

2. The transformer riser according to claim 1, characterized in that: A wiring flange is also provided in the middle of the outer side of the lifting seat, and a wiring box is installed on the wiring flange.

3. The transformer riser according to claim 1, characterized in that: An annular support plate is provided at the lower end of the interior of the lifting platform, and the support plate is used to support the current transformer located in the lifting platform, and the insulating end ring located at the bottom of the current transformer is arranged above the support plate.

4. The transformer riser according to claim 1, characterized in that: The lower elevated seat comprises a lower wall tube and an upper flange. The lower end of the lower wall tube is inserted into the opening and inlaid and welded with the box cover, and the upper end of the lower wall tube is inserted into the through hole in the middle of the upper flange and inlaid and welded with the upper flange.

5. The transformer riser according to claim 4, characterized in that: The diameter of the lower wall tube is the minimum dimension to ensure the live insulation distance of the low-voltage bushing, and the height of the lower wall tube is the minimum dimension to ensure the welding of the box cover and the box edge or the bolt installation of the box edge.

6. The transformer riser according to claim 1, characterized in that: The lifting seat includes an upper wall tube and an upper flange 2 and a lower flange arranged at the upper and lower ends of the upper wall tube. The upper end of the upper wall tube is inserted into the middle through hole of the upper flange 2 and is embedded and welded therewith, and the lower end of the upper wall tube is inserted into the middle through hole of the lower flange and is embedded and welded therewith.

7. The transformer riser according to claim 1, characterized in that: The insulating spacers are fan-shaped, and at least three of them are provided, and the inner arc and the outer arc of the insulating spacers do not protrude from the current transformer.

8. The transformer riser according to claim 6 or 7, characterized in that: A paper groove and a support bar are also provided in the upper wall tube. A plurality of grooves evenly distributed around the circumference are provided on the insulating end plate. The paper groove is inserted in the groove, and the upper end of the paper groove extends out of the insulating end plate at the top, and the lower end extends out of the insulating end plate at the bottom. The support bar is inserted in the paper groove, one side of which abuts against the bottom surface of the paper groove, and the other side abuts against the inner side surface of the upper wall tube, so as to compress the current transformer.

9. The transformer riser according to claim 8, characterized in that: The grooves are arranged in one-to-one correspondence with the insulating spacers, and the distance from the bottom surface of the groove to the center of the insulating end plate is smaller than the radius of the outer arc of the insulating spacer.

10. The transformer riser according to claim 1, characterized in that: The air guide pipe joint is connected to the interior of the rising seat through an air guide hole arranged on the top of the bushing mounting flange. One end of the air guide pipe joint is a connecting end welded to the top surface of the bushing mounting flange, and the other end is connected to the main air channel of the transformer body. The connecting end is a round tube with a notch at the lower end. The bottom surface of the notch abuts against the top surface of the bushing mounting flange, and the notch is arranged toward the air guide hole to cover the air guide hole. The air guide hole is arranged close to the inner side surface of the upper wall tube, and the air guide hole is arranged between adjacent insulating pads.

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