Concentrated transformer low-voltage ascending flanged base

Abstract

The utility model provides a concentrated transformer low-voltage 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 at the edge of a tank cover of a transformer oil tank and is connected with the tank cover in a welding manner, and four current transformers are arranged in the upper ascending flanged base in a stacked manner. The four current transformers are isolated through insulating washers, insulating end rings are arranged at the bottoms and the tops of the four current transformers, each insulating end ring comprises an insulating end plate and a plurality of insulating cushion blocks, the insulating end plates abut against the current transformers, and the insulating cushion blocks are arranged on the sides, away from the current transformers, of the insulating 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. According to the utility model, the structure is simple, a plurality of TPY current transformers can be intensively arranged in one low-voltage bushing ascending flanged base without increasing the size of an oil tank, the cost is saved, and the market competitiveness is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer technical field especially relates to a centralized transformer low pressure riser. BACKGROUND

[0002] At present, bushing current transformer is indispensable in power transformer. 500kV transformer is usually designed into single phase type, and high voltage bushing and its riser, medium voltage bushing and its riser, neutral point bushing and its riser and low voltage bushing and its riser are arranged on each single phase transformer. In general, four current transformers are arranged in the low voltage bushing, including two transient protection level LRBT (TPY), one protection level LRB and one measurement level LR. One TPY and one LRB are arranged on one low voltage bushing, and one TPY and one LR are arranged on another low voltage bushing. In addition, sometimes two TPYs are arranged on one low voltage bushing or four CTs are all arranged on one low voltage bushing. However, the CT installation length of the low voltage bushing cannot be too long in general, which limits the total height of the riser CT installation, and the installation interface between the low voltage bushing and the tank cover cannot be too large, otherwise it will affect the overall size of the oil tank. The size of TPY transformer is large, and the conventional riser cannot meet the requirement, which brings great problems to the design. SUMMARY

[0003] The utility model aims at providing a centralized transformer low pressure riser to overcome the deficiencies in the prior art.

[0004] To solve the above technical problems, the technical scheme of the utility model is as follows: a centralized transformer low pressure riser, which comprises a lower riser, an upper riser and a bushing installation flange arranged in sequence from bottom to top, the lower riser is arranged on a tank cover of a transformer oil tank, the tank cover is provided with an opening arranged by a sealing strip close to the edge of the tank cover, the lower riser is inserted into the opening and is welded and connected with the tank cover, the upper riser is connected with the lower riser through fasteners, four current transformers are arranged in the upper riser in a stacked manner, the four current transformers are isolated through insulating washers, and insulating end rings are further arranged at the bottom and the top of the four current transformers, the insulating end ring comprises an insulating end plate and an insulating pad, the insulating end plate abuts against the current transformer, the insulating pad is arranged on the side of the insulating end plate away from the current transformer, and a plurality of insulating pads are arranged and are uniformly distributed around the center circumference of the lower riser, the bushing installation flange is arranged above the insulating end ring at the top and is connected with the upper riser through fasteners, a gas guide pipe joint is arranged at the top of the bushing installation flange and is in communication with the inside of the upper riser, and a low voltage bushing is arranged on the bushing installation flange and passes through the four current transformers and is arranged in the oil tank.

[0005] Further, the centralized transformer low-voltage riser of the above has a wiring flange in the middle of the outer side of the riser, and a wiring box is installed on the wiring flange.

[0006] Further, the centralized transformer low-voltage riser of the above has a ring-shaped supporting plate in the inner lower end of the riser, which is used to support the current transformer in the riser, and the insulating end ring at the bottom of the current transformer is arranged above the supporting plate.

[0007] Further, the centralized transformer low-voltage riser of the above has a lower riser including a lower wall cylinder, and an upper flange I, wherein the lower end of the lower wall cylinder is inserted into the opening and inlay-welded with the box cover, the upper end of the lower wall cylinder is inserted into the through hole in the middle of the upper flange I and inlay-welded with the upper flange I, and the inlay height of the lower end of the lower wall cylinder is greater than 2 / 3 of the thickness of the box cover, and the inlay height of the upper end is greater than 2 / 3 of the thickness of the upper flange.

[0008] Further, the centralized transformer low-voltage riser of the above has a diameter of the lower wall cylinder being the minimum size to ensure the live insulation distance of the low-voltage bushing, and a height of the lower wall cylinder being the minimum size to ensure the welding or bolt installation of the box cover along the tank, and the lower riser is about 100 mm higher than the oil tank cover.

[0009] Further, the centralized transformer low-voltage riser of the above has an upper riser including an upper wall cylinder, and an upper flange II and a lower flange arranged at the upper and lower ends of the upper wall cylinder, wherein the upper end of the upper wall cylinder is inserted into the through hole in the middle of the upper flange II and inlay-welded therewith, the lower end of the upper wall cylinder is inserted into the through hole in the middle of the lower flange and inlay-welded therewith, and the inlay height of the upper end of the upper wall cylinder is greater than 2 / 3 of the thickness of the upper flange II, and the inlay height of the lower end is greater than 2 / 3 of the thickness of the lower flange.

[0010] Further, the centralized transformer low-voltage riser of the above has a plurality of installation holes I arranged correspondingly on the lower flange and the upper flange I, and the two are connected through fasteners passing through the installation holes I; and a plurality of installation holes II arranged correspondingly on the upper flange II and the bushing installation flange, and the two are connected through fasteners passing through the installation holes II.

[0011] Further, the centralized transformer low-voltage riser of the above has a ring-shaped sealing groove arranged on the top surface of the upper flange I and the upper flange II, which is arranged close to the upper wall cylinder, inside the installation holes I and II, and a sealing ring is inlaid in the sealing groove.

[0012] Further, the centralized transformer low-voltage riser of the above has at least three fan-shaped insulating pads, and the inner arc and outer arc of the insulating pad are not protruding to the current transformer.

[0013] Further, the centralized transformer low-voltage riser of the above has a paper slot and a support bar in the upper wall cylinder, the insulation end plate is provided with a plurality of circumferentially distributed grooves, the paper slot is inserted in the groove, and the upper end of the paper slot extends out of the insulation end plate at the top and the lower end extends out of the insulation end plate at the bottom, and the support bar is inserted in the paper slot and abuts against the bottom surface of the paper slot on one side and the inner side surface of the upper wall cylinder on the other side, for pressing the current transformer.

[0014] Further, the centralized transformer low-voltage riser of the above has the grooves corresponding to the insulation blocks one by one, and the distance from the bottom surface of the groove to the center of the insulation end plate is less than the radius of the outer arc of the insulation block.

[0015] Further, the centralized transformer low-voltage riser of the above has the gas guide pipe joint communicating with the inside of the riser through the gas guide hole provided at the top of the bushing mounting flange, one end of the gas guide pipe joint is a connecting end welded with the top surface of the bushing mounting flange, the other end is connected with the main gas guide channel of the transformer body, the connecting end is a circular pipe 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 towards the gas guide hole and covers the gas guide hole; the gas guide hole is arranged close to the inner side surface of the upper wall cylinder, and the gas guide hole is arranged between adjacent insulation blocks.

[0016] Compared with the prior art, the centralized transformer low-voltage riser has the advantages that the structure is simple, the design is reasonable, the riser structure and the gas guide pipe structure are simplified, a plurality of TPY current transformers can be arranged in one low-voltage bushing riser without increasing the size of the oil tank, the size of the oil tank is reduced, the cost is saved, and the market competitiveness of the transformer product is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 It is a structure schematic view of the centralized transformer low-voltage riser of the present application.

[0019] Figure 2 It is a local structure schematic view of the centralized transformer low-voltage riser of the present application.

[0020] Figure 3 It is an insulation end ring structure schematic view of the centralized transformer low-voltage riser of the present application.

[0021] Figure 4The flange of the bushing installation is installed in the low-voltage riser of the centralized transformer.

[0022] Figure 5 The installation schematic view of the low-voltage riser of the centralized transformer is shown in the utility model.

[0023] In the drawing: 100, low-voltage riser;

[0024] 1, lower riser; 11, lower wall cylinder; 12, upper flange one; 13, sealing groove;

[0025] 2, upper riser; 21, upper wall cylinder; 22, upper flange two; 23, lower flange; 24, supporting plate; 25, wiring flange; 26, junction box;

[0026] 3, bushing installation flange; 31, gas guide pipe joint; 311, connecting end; 32, gas guide hole;

[0027] 4, current transformer; 5, insulating washer; 6, insulating end ring; 61, insulating end plate; 611, recess; 62, insulating pad; 7, paper groove; 8, brace;

[0028] 9, oil tank; 91, tank cover; 92, opening; 10, low-voltage bushing. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0030] Embodiment 1

[0031] As Figures 1-5As shown in the drawings, a centralized transformer low-voltage riser 100 is arranged at the corner edge of a transformer oil tank 9, and comprises a lower riser 1, an upper riser 2 and a bushing mounting flange 3 arranged in sequence from bottom to top, the lower riser 1 is arranged on a tank cover 91 of the oil tank 9, the tank cover 91 is provided with an opening 92 arranged close to the edge of the tank cover 91, the lower riser 1 is inserted into the opening 92 and is welded to the tank cover 91, the upper riser 2 is connected to the lower riser 1 through fasteners, four current transformers 4 are arranged in the upper riser 2 in a stack, from bottom to top, they are LR, LRB, LRBT and LRBT respectively, the lower end of an upper wall cylinder 21 of the upper riser 2 is provided with an annular supporting plate 24, the supporting plate 24 is used for supporting the current transformers 4 arranged in the upper riser 2, the four current transformers 4 are isolated through insulation washers 5, and the bottom and top of the four current transformers 4 are further provided with insulation end rings 6, the insulation end ring 6 arranged at the bottom of the current transformer 4 is arranged above the supporting plate 24, the bushing mounting flange 3 is arranged above the insulation washer 6 arranged at the top, and is connected to the upper riser 2 through fasteners, the bushing mounting flange 3 is provided with a gas guide pipe joint 31 which is in communication with the inside of the upper riser 2, and a low-voltage bushing 10 is arranged on the bushing mounting flange 3 and extends into the oil tank 9 from between the four current transformers 4. The low-voltage bushing riser of the utility model can place multiple TPY current transformers without increasing the size of the oil tank, simplifies the structure of the riser and the structure of the gas guide pipe, is simple in structure, reasonable in design, and is conducive to reducing the size of the oil tank and saving cost. It should be noted that the utility model is also applicable to conventional low-voltage bushing risers.

[0032] In the above structure, as shown in the drawings, Figures 1-3 The insulation end ring 6 comprises an insulation end plate 61 and an insulation pad 62, the insulation end plate 61 abuts against the current transformer 4, the insulation pad 62 is arranged on the side of the insulation end plate 51 away from the current transformer 4, the insulation pad 62 is fan-shaped, at least three insulation pads 62 are arranged, are uniformly distributed around the center of the upper riser 2, and the inner arc and the outer arc of the insulation pad 62 are not protruded to the current transformer 4, so that the CT can be leveled, and the gas can be smoothly guided out after the gas is generated. The insulation washer 5 and the insulation end plate 61 are made of insulation thin paper board, are light and thin, and the insulation pad 62 is made of insulation paper board.

[0033] In addition, in order to improve the gas guiding effect and most effectively guide out the gas, as shown in the drawings, Figure 1 , 4As shown, the gas guide pipe joint 31 is communicated with the inside of the rising stand 2 through the gas guide hole 32 provided at the top of the bushing mounting flange 3. One end of the gas guide pipe joint 31 is connected with the top surface of the bushing mounting flange 3 by welding, and the other end is connected with the main gas guide channel of the transformer body, and finally reaches the oil conservator through the gas relay. The connecting end 311 is a round pipe with a notch at the lower end, the bottom surface of the notch is abutted with the top surface of the bushing mounting flange 3, and the notch is arranged towards the gas guide hole 32 and covers the gas guide hole 32. The gas guide hole 32 is arranged close to the inner side surface of the upper wall cylinder 21, and the gas guide hole 32 is arranged between the adjacent insulation pads 62, so that there is a gas guide space between the bottom surface of the bushing mounting flange 3 and the insulation end plate 61, and the gas guide hole 32 can be avoided from being blocked. The gas guide structure is simple and the gas guide effect is good.

[0034] In order to facilitate the CT lead to be drawn out, as shown in Figure 2 , the middle part of the outer side of the rising stand 2 is further provided with a wiring flange 25, and the wiring box 26 is mounted on the wiring flange 25.

[0035] Example 2

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

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

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

[0039] Among them, asFigure 1 、 4 As shown in the drawings, the lower flange 23 and the upper flange one 12 are provided with a plurality of mounting holes one corresponding to each other, and are connected by fasteners passing through the mounting holes one; the upper flange two 22 and the sleeve mounting flange 3 are provided with a plurality of mounting holes two corresponding to each other, and are connected by fasteners passing through the mounting holes two, which is convenient and simple to disassemble and assemble, and the upper lifting seat 2 can be disassembled and transported during transportation, which is good in flexibility.

[0040] In addition, as shown in the drawings, Figure 2 、 3 The upper wall cylinder 21 is further provided with a paper groove 7 and a supporting strip 8, the insulation end plate 61 is provided with a plurality of circumferentially distributed grooves 611, the paper groove 7 is inserted into the groove 611, and the upper end of the paper groove 7 extends out of the insulation end plate 61 at the top, and the lower end of the paper groove 7 extends out of the insulation end plate 61 at the bottom, the supporting strip 8 is inserted into the paper groove 7 and abuts against the bottom surface of the paper groove 7 on one side and the inner side of the upper wall cylinder 21 on the other side, for pressing the current transformer 4, so that the current transformer 4 is firmly fixed in the upper lifting seat 2, and the working stability of the CT is ensured. The supporting strip 8 is made of laminated paper board, and the thickness can be adjusted according to the actual situation. The groove 611 and the insulation pad 62 are one-to-one corresponding, and the distance from the bottom surface of the groove 611 to the center of the insulation end plate 61 is less than the radius of the outer arc of the insulation pad 62.

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

[0042] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0043] In addition, it should be understood that although the present application is described in the specification, each embodiment does not contain only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments which can be understood by those skilled in the art.

Claims

1. A concentrated transformer low voltage riser, characterized by: The application relates to a current transformer installation structure, which comprises a lower elevated seat, an upper elevated seat and a sleeve installation flange arranged in sequence from bottom to top, wherein the lower elevated seat is arranged on a transformer oil tank cover, the tank cover is provided with an opening arranged near a sealing strip at the edge of the tank cover, the lower end of the lower elevated seat is inserted into the opening and is welded to the tank cover, the upper elevated seat is connected to the lower elevated seat through fasteners, four current transformers are arranged in the upper elevated seat, the four current transformers are isolated through insulating washers, and insulating end rings are arranged at the bottom and top of the four current transformers, the insulating end ring comprises an insulating end plate and insulating pads, the insulating end plate is in abutment with the current transformers, the insulating pads are arranged on the side of the insulating end plate away from the current transformers, a plurality of insulating pads are arranged, and the insulating pads are uniformly distributed around the center of the lower elevated seat; the sleeve installation flange is arranged above the insulating end ring at the top and is connected to the upper elevated seat through fasteners, and the sleeve installation flange is provided with a gas guide pipe joint which is in communication with the inside of the upper elevated seat.

2. The centralized transformer low voltage riser of claim 1, wherein: A wiring flange is arranged at the middle of the outer side of the upper elevated seat, and a wiring box is arranged on the wiring flange.

3. The concentrated transformer low voltage riser of claim 1, wherein: An annular supporting plate is arranged at the lower end of the inside of the upper elevated seat, the supporting plate is used for supporting the current transformers arranged in the upper elevated seat, and the insulating end ring arranged at the bottom of the current transformers is arranged above the supporting plate.

4. The concentrated transformer low voltage riser of claim 1, wherein: The lower elevated seat comprises a lower wall cylinder and an upper flange one, the lower end of the lower wall cylinder is inserted into the opening and is inlaid and welded to the tank cover, and the upper end of the lower wall cylinder is inserted into the through hole in the middle of the upper flange one and is inlaid and welded to the upper flange one.

5. The centralized transformer low voltage riser of claim 4, wherein: The upper elevated seat comprises an upper wall cylinder, an upper flange two and a lower flange arranged at the upper and lower ends of the upper wall cylinder, the upper end of the upper wall cylinder is inserted into the through hole in the middle of the upper flange two and is inlaid and welded thereto, and the lower end of the upper wall cylinder is inserted into the through hole in the middle of the lower flange and is inlaid and welded thereto.

6. The concentrated transformer low voltage riser of claim 5, wherein: A plurality of mounting holes one are arranged on the upper flange one and the lower flange in a corresponding mode, and the upper flange one and the lower flange are connected through fasteners penetrating through the mounting holes one; a plurality of mounting holes two are arranged on the upper flange two and the sleeve installation flange in a corresponding mode, and the upper flange two and the sleeve installation flange are connected through fasteners penetrating through the mounting holes two.

7. The centralized transformer low voltage riser of claim 5, wherein: Annular sealing grooves are arranged on the top surfaces of the upper flange one and the upper flange two, the sealing grooves are arranged near the upper wall cylinder, and sealing rings are inlaid in the sealing grooves.

8. The concentrated transformer low voltage riser of claim 1, wherein: The insulating pads are fan-shaped, at least three insulating pads are arranged, and the inner arc and the outer arc of the insulating pads are not protruded to the current transformers.

9. The concentrated transformer low voltage riser of claim 5, wherein: Paper grooves and supporting rods are further arranged in the upper wall cylinder, a plurality of circumferentially-distributed grooves are arranged on the insulating end plate, the paper grooves are inserted into the grooves, the upper end of the paper groove is protruded to the insulating end plate at the top, the lower end of the paper groove is protruded to the insulating end plate at the bottom, the supporting rods are inserted into the paper grooves, one side of the supporting rods is in abutment with the bottom surface of the paper groove, and the other side of the supporting rods is in abutment with the inner surface of the upper wall cylinder, so as to compress the current transformers.

10. The concentrated transformer low voltage riser of claim 1, wherein: The gas guide pipe joint is communicated with the inside of the ascending pedestal through a gas guide hole arranged on the top of the sleeve mounting flange, one end of the gas guide pipe joint is a connecting end welded with the top surface of the sleeve mounting flange, the other end is connected with the main gas guide channel of the transformer body, the connecting end is a circular pipe with a notch arranged on the lower end, the bottom surface of the notch is abutted with the top surface of the sleeve mounting flange, and the notch is arranged towards the gas guide hole and covers the gas guide hole; the gas guide hole is arranged close to the inner side surface of the upper wall cylinder, and the gas guide hole is arranged between adjacent insulation pads.

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