CN215220460U

CN215220460U - Built-in current-limiting reactor

Info

Publication number: CN215220460U
Application number: CN202121534525.5U
Authority: CN
Inventors: 周繁; 徐思华; 廖金木; 佐明; 崔明兴; 刘均菲; 彭博; 刘屹
Original assignee: TBEA Shenyang Transformer Group Co Ltd
Current assignee: TBEA Shenyang Transformer Group Co Ltd
Priority date: 2021-07-07
Filing date: 2021-07-07
Publication date: 2021-12-17
Anticipated expiration: 2031-07-07

Abstract

The utility model relates to a built-in current-limiting reactor, which comprises an upper yoke, a coil and a lower yoke which are arranged from top to bottom in sequence, wherein the upper yoke is provided with an upper yoke, the upper side of the upper yoke is provided with an upper connecting seat, the interior of the upper yoke is provided with an upper silicon steel sheet, the upper silicon steel sheet is insulated with the upper yoke and connected with the upper connecting seat, the upper connecting seat is connected with the corresponding upper clamping piece of the transformer, the lower yoke is provided with a lower yoke, the lower side of the lower yoke is provided with a pad foot, the inner part of the lower yoke is provided with the lower silicon steel sheet, the lower silicon steel sheet is insulated with the lower yoke and connected with the corresponding pad foot, the pad foot is connected with the corresponding lower clamping piece of the transformer, a vertical screw rod is arranged between the upper yoke and the lower yoke, and the upper end of the vertical screw is fixedly connected with the corresponding upper connecting seat, the lower end of the vertical screw is fixedly connected with the corresponding pad foot, an upper lead row and a lower lead row are arranged on the outer side of the coil, and the upper lead row and the lower lead row are respectively connected with the corresponding low-voltage lead rows of the transformer. The utility model discloses the cost is lower, and the loss is littleer, and anti short circuit ability is stronger to shorten production cycle and also reduced installation occupation space simultaneously.

Description

Built-in current-limiting reactor

Technical Field

The utility model belongs to the technical field of the transformer technique and specifically relates to a built-in current-limiting reactor.

Background

At present, the installed capacity of a power transformer is larger and larger, the increased short-circuit current can also cause larger damage to various electrical equipment on a power grid, in order to limit the short-circuit current value, a large impedance transformer needs to be adopted in the power grid, a common method in the prior art is to serially connect a group of current limiting reactors with a winding of the transformer to improve the impedance of the transformer, the current limiting reactors are generally serially connected with the low-voltage side of the transformer and are placed in the same oil tank with a transformer body, because the low-voltage side of the transformer has larger rated current and short-circuit current value, the current limiting reactors generally need to adopt a special structural form to meet the severe requirements of temperature rise, short-circuit force, vibration noise and the like, for example, a built-in transformer current limiting device is disclosed in Chinese utility model patent with the grant publication No. CN207367766U, and comprises a plurality of branch capacitors, and each branch capacitor is formed by, The current-limiting reactor and the quick switch are connected in parallel, automatic switching of the current-limiting reactor and automatic adjustment of impedance can be achieved, and then short-circuit current impact is reduced. In addition, the traditional scheme of the current-limiting reactor adopts a hollow double-continuous middle outgoing coil structure of self-adhesive transposed conductors, an upper yoke and a lower yoke are directly in a welding structure and are assembled behind a transformer, and then lead wires are configured.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a built-in current-limiting reactor, the cost is lower, and the loss is littleer, and anti short circuit ability is stronger to shorten production cycle and also reduced installation occupation space simultaneously.

The purpose of the utility model is realized through the following technical scheme:

a built-in current-limiting reactor comprises an upper yoke, a coil and a lower yoke, wherein the upper yoke is provided with an upper yoke, an upper connecting seat is arranged on the upper side of the upper yoke, an upper silicon steel sheet is arranged inside the upper yoke, the upper silicon steel sheet is insulated with the upper yoke and connected with the upper connecting seat, the upper connecting seat is connected with a corresponding upper transformer clamping piece, the lower yoke is provided with a lower yoke, a pad foot is arranged on the lower side of the lower yoke, a lower silicon steel sheet is arranged inside the lower yoke, the lower silicon steel sheet is insulated with the lower yoke and connected with a corresponding pad foot, the pad foot is connected with a corresponding lower transformer clamping piece, a vertical screw is arranged between the upper yoke and the lower yoke, the upper end of the vertical screw is fixedly connected with the corresponding upper connecting seat, the lower end of the vertical screw is fixedly connected with the corresponding pad foot, an upper lead row and a lower lead row are arranged on the outer side of the coil, and the upper lead row and the lower lead row are respectively connected with a corresponding low-voltage lead row of the transformer.

The coil is a hollow spiral coil and the conducting wire adopts a single paper covered wire.

The coil is of a structure that a plurality of wires are wound in parallel, a Pange transposition mode is adopted among parallel winding wires, and the transposition frequency is the same as the number of the parallel winding wires.

An oil baffle plate is arranged inside the coil.

The upper yoke frame comprises upper yoke webs and upper yoke horizontal screw rods, the two upper yoke webs are respectively arranged on two sides of an upper silicon steel sheet, two ends of each upper yoke horizontal screw rod are respectively connected with the upper yoke webs on the corresponding sides, the upper yoke webs are insulated with the upper silicon steel sheet, the upper yoke horizontal screw rods are insulated with the upper yoke webs, and the upper connecting seats are arranged on the upper sides of the upper yoke webs.

The upper connecting seats are insulated from the corresponding upper clamping pieces of the transformer, and any one group of upper connecting seats and the upper clamping pieces of the transformer are connected with a grounding wire.

Lower yoke includes yoke web and lower yoke horizontal screw rod down, and two lower yoke webs divide and locate silicon steel sheet both sides down, and lower yoke horizontal screw rod both ends are connected with the lower yoke web that corresponds the side respectively, lower yoke web is insulating with lower silicon steel sheet, lower yoke horizontal screw rod is insulating with lower yoke web, and yoke web downside is located down to the foot pad.

The pad feet and the transformer lower clamping piece are insulated, and any one group of pad feet and the transformer lower clamping piece are connected with a grounding wire.

The coil is equipped with and goes out the head and go out the head down, just go up the head and go out the lead wire row connection, go out the head down and be connected with down the lead wire row.

And butterfly springs are arranged at two ends of the vertical screw, and a pressure cylinder is arranged between the upper clamping piece of the transformer and the corresponding upper connecting seat.

The utility model discloses an advantage does with positive effect:

1. the utility model discloses the silicon steel sheet in upper yoke and the lower yoke passes through both sides web centre gripping fixed, need not punch or weld on the silicon steel sheet, can not destroy silicon steel sheet structure, reduces the structural loss, and adopts the taut fixed coil that compresses tightly of vertical screw between upper yoke and the lower yoke, and the anti short circuit ability of coil is stronger, and effective noise reduction.

2. The utility model discloses a single paper envelope curve has been adopted to the coil, and the wire cost is lower to having adopted the spiral coil of pange transposition, the circulation loss is littleer, and the coiling speed is more swift, has increased the oil baffle simultaneously, and the winding temperature rise is lower.

3. The utility model discloses a coil is for going out the head and going out the two first structures of going out of head down, compares three first structures of going out of the top of prior art, and it is more succinct to be connected with the transformer to coil goes out the head and leads to one side through last lead wire row and lower lead wire row, both convenient and transformer low pressure side connection, and the distance need not consider the distance of artifical configuration lead wire between reactor and the transformer simultaneously, only need consider insulating distance, thereby effectively reduce the interval between reactor and the transformer.

4. The utility model discloses can set up between folder and the last connecting seat on the transformer and press the jar further compactor body to further improve the anti short circuit ability of reactor, and effectively reduce the noise that the reactor produced.

5. The utility model discloses the size is very little, can put into the oil tank together with the transformer, and the oil tank adopts standard oil tank, its width direction and transformer keep unanimous can, need not be the local installation space that enlarges of reactor.

Drawings

Figure 1 is a front view of the present invention,

figure 2 is a top view of the invention of figure 1,

figure 3 is a simplified schematic diagram of a structure of the present invention,

figure 4 is a simplified schematic diagram of another configuration of the present invention,

figure 5 is a schematic representation of the pogo transposition of the coil of figure 1,

fig. 6 is a schematic view of the coil outlet and the oil baffle of fig. 1.

The transformer comprises a lower yoke 1, a lower yoke web 101, a lower yoke horizontal screw 102, a pad foot 103, a coil 2, a single paper covered wire 201, an upper outlet 202, a lower outlet 203, an oil baffle 204, an upper yoke 3, an upper yoke web 301, an upper yoke horizontal screw 302, an upper connecting seat 303, an upper lead row 4, a vertical screw 5, a lower lead row 6, a transformer 7, a transformer upper clamp 701, a transformer lower clamp 702, a transformer low-voltage lead row 703, an oil tank 8 and a grounding wire 9.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1-6, the utility model discloses an by last yoke 3, coil 2 and lower yoke 1 that sets gradually under to, wherein upper yoke 3 is equipped with yoke, upper yoke upside is equipped with upper connecting seat 303, inside is equipped with the silicon steel sheet, and go up silicon steel sheet and upper yoke insulating and be connected with upper connecting seat 303 through first grounding sheet, upper connecting seat 303 is connected with the last folder 701 of transformer that corresponds on the transformer 7, lower yoke 1 is equipped with lower yoke, lower yoke downside is equipped with the foot pad 103, inside is equipped with lower silicon steel sheet, and lower silicon steel sheet and lower yoke insulating and be connected with corresponding foot pad 103 through the second grounding sheet, foot pad 103 is connected with the last corresponding folder 702 of transformer 7 under, be equipped with vertical screw 5 between upper yoke 3 and the lower yoke 1, just vertical screw 5 upper end links firmly with corresponding upper connecting seat 303, the lower extreme links firmly with corresponding foot pad 103, thereby with upper yoke 3, lower yoke, The coil 2 and the lower yoke 1 are tightened and fixed, as shown in fig. 1 and fig. 2, an upper lead row 4 is arranged on the outer side of the upper part of the coil 2, a lower lead row 6 is arranged on the outer side of the lower part of the coil 2, and the upper lead row 4 and the lower lead row 6 are respectively connected with a corresponding transformer low-voltage lead row 703 on a transformer 7. In this embodiment, the upper lead row 4, the lower lead row 6, and the transformer low-voltage lead row 703 are all copper bars, and the first grounding strip and the second grounding strip are all copper sheets.

As shown in fig. 1 to 2, the upper yoke includes an upper yoke web 301 and an upper yoke horizontal screw 302, the two upper yoke webs 301 are respectively disposed on two sides of an upper silicon steel sheet, two ends of the upper yoke horizontal screw 302 are respectively connected to the upper yoke webs 301 on the corresponding sides, so as to tension and clamp the upper yoke webs 301 on two sides to fix the middle upper silicon steel sheet, the upper yoke web 301 is insulated from the upper silicon steel sheet, and the upper yoke horizontal screw 302 is insulated from the upper yoke web 301 to prevent formation of a circulation current, wherein the insulation state can be realized by providing an insulating pad or the like, or the upper yoke web 301 is made of an insulating material, which is a known technology in the art, and the upper connection seat 303 is disposed on the upper side of the upper yoke web 301, and the upper silicon steel sheet is connected to the upper connection seat 303 through a first ground plate, so as to form an equipotential. The utility model discloses need not punch or weld on the silicon steel sheet, can not destroy the silicon steel sheet structure to can effectively reduce the silicon steel sheet loss.

As shown in fig. 1, the lower yoke includes a lower yoke web 101 and a lower yoke horizontal screw 102, the two lower yoke webs 101 are respectively disposed at two sides of a lower silicon steel sheet, two ends of the lower yoke horizontal screw 102 are respectively connected with the lower yoke web 101 at the corresponding side, so that the lower yoke webs 101 at the two sides are tensioned and clamped to fix the lower silicon steel sheet in the middle, the lower yoke web 101 is also insulated from the lower silicon steel sheet, the lower yoke horizontal screw 102 is insulated from the lower yoke web 101 to prevent the formation of a circulating current, and a foot pad 103 is disposed at the lower side of the lower yoke web 101.

And two ends of the vertical screw 5 are provided with belleville springs to ensure that the upper yoke 3, the coil 2 and the lower yoke 1 are pressed to form a whole body and improve the short-circuit resistance, and the belleville springs are commercially available products.

As shown in fig. 3-4, the coil 2 can adopt a single-phase double-column (fig. 3) structure or a three-phase three-column (fig. 4) structure, and the coil 2 is a hollow spiral coil, so that compared with the existing double-continuous coil, the winding of the hollow spiral coil is faster, the ampere-turn distribution is more uniform, the short-circuit resistance is strong, the electric density can be properly improved, and the amount of copper wires is saved.

As shown in FIG. 5, the wire of the coil 2 adopts a single paper-covered wire 201, so that the paper insulation thickness of the outer side of the wire can be selected according to the voltage class, and the cost of the wire is lower than that of the self-adhesive transposed wire in the prior art.

The coil 2 adopts a multi-winding structure, the number of windings can be selected according to the short-circuit current value, is usually larger than 40 wires, and is wound in parallel, in addition, in order to reduce the circulation loss, as shown in fig. 5, a pando transposition mode is adopted between the windings, the transposition frequency is the same as the number of windings, the circulation loss can be effectively reduced by adopting the transposition mode, and the winding is convenient, wherein the pando transposition mode is a known technology in the field.

As shown in fig. 6, the coil 2 has an oil baffle 204 structure, and a plurality of oil baffles 5 can be arranged inside the coil according to actual conditions to reasonably control oil flow and effectively reduce the temperature rise of the coil. The oil baffle 5 is well known in the art.

As shown in fig. 6, coil 2 adopts the tip structure of being qualified for the next round of competitions, and it is equipped with out head 202 and lower head 203, is qualified for the next round of competitions and is equipped with three coil in the middle part of being qualified for the next round of competitions and goes out the head, compare in prior art middle part, the utility model discloses it is more succinct to be connected with the transformer.

As shown in fig. 1, coil 2's last end 202 corresponds with last lead wire row 4 and is connected, and lower end 203 corresponds with lower lead wire row 6 and is connected, as shown in fig. 2, coil 2's end is led to reactor one side through last lead wire row 4 and lower lead wire row 6 to reserve the interface and be connected with transformer low pressure lead wire row 703 in order to make things convenient for, because place the reactor in transformer 10's long axis side usually, the utility model discloses owing to preassemble last lead wire row 4 and lower lead wire row 6, the distance of manual configuration lead wire need not be considered between reactor and the transformer 7, only need consider insulating distance, thereby effectively reduce the interval between reactor and the transformer 7, whole volume reduces. The upper lead row 4 and the lower lead row 6 can be connected with the corresponding transformer low-voltage lead row 703 through a lug or a cable, and the installation is simple and convenient.

As shown in fig. 1-2, the upper connection socket 303 on the upper side of the upper yoke is connected to the corresponding upper clamp 701 of the transformer 7, and the insulation between the upper yoke 3 and the upper clamp 701 of the transformer needs to be ensured, and the insulation state can be realized by arranging an insulation pad and other structures, which are known in the art, and as shown in fig. 1, one set of the upper connection socket 303 and the upper clamp 701 of the transformer are connected to the ground wire 9, so that an equipotential is formed between the two. The pad foot 103 of the lower yoke is connected to the corresponding lower clamp 702 of the transformer 7, and it is also necessary to ensure the insulation between the pad foot 103 of the lower yoke 1 and the lower clamp 702 of the transformer, and as shown in fig. 1, one set of pad foot 103 and the lower clamp 702 of the transformer are connected to the ground line 9 to form an equipotential.

As shown in fig. 1, a pressure cylinder may be disposed between the transformer upper clamping piece 701 and the corresponding upper connection seat 303 to further compress the reactor body, so as to further reduce noise of the reactor coil 2 and improve short-circuit resistance. The press cylinder is well known in the art and is a commercially available product.

As shown in fig. 2, the utility model discloses accomplish after the assembly along with transformer 7 fall into in the oil tank 8 together, because the utility model discloses an optimize the structure, the reactor size is less, and oil tank 8 can adopt standard rectangle oil tank, it in width direction with transformer 7 keep unanimous can, need not be the local installation space that enlarges of reactor.

The utility model discloses a theory of operation does:

as shown in fig. 3 ~ 6, the utility model discloses coil 2 can adopt single-phase twin columns (fig. 3) structure, or three-phase three-column (fig. 4) structure, every post is hollow spiral coil, and the wire adopts single paper envelope curve 3 and many wires duplex winding formula structure, duplex winding adopts the pantoge transposition mode between the line, coil 2 only goes out first 202 and two heads 203 down, 2 structure coilings of whole coil are more swift, ampere-turn distributes more evenly, the cost is lower, anti short circuit ability is stronger, can effectively reduce the circulation loss, and it is more succinct to be connected with transformer 7.

In addition as shown in fig. 1-2, the utility model discloses a connect through vertical screw 5 between upper yoke 3 and the lower yoke 1, can guarantee that coil 2 compresses tightly, and the upper yoke web 301 of upper yoke 3 both sides and the lower yoke web 101 of lower yoke 1 both sides all connect through horizontal screw, make the silicon steel sheet press from both sides tightly fixedly through the web that corresponds to need not punch or weld on the silicon steel sheet, can not destroy the silicon steel sheet structure, reduce the loss of structure.

The utility model discloses concrete assembling process as follows:

firstly, placing coils 2 after assembly on a lower yoke 1, adjusting the heights of the coils 2 to be consistent, placing an upper yoke 3 on the coils 2, then tensioning the upper yoke 3, the coils 2 and the lower yoke 1 through a plurality of vertical screws 5, arranging a belleville spring at the upper end of each vertical screw 5 to ensure that the upper yoke 3, the coils 2 and the lower yoke 1 are pressed to form a whole, and arranging bolts on the vertical screws 5 to realize fixation.

Two, will the utility model discloses place in the long axis side of transformer 7 and place on the transformer between folder 701 and the folder 702 down of depressor, pass through the bolt with the last connecting seat 303 of yoke 3 upside and the transformer that corresponds on folder 701 and link firmly, pass through the bolt with folder 702 under the pad foot 103 of yoke 1 downside and the transformer that corresponds and link firmly to it forms the equipotential to be connected with earth connection 9 on folder 701 on arbitrary a set of last connecting seat 303 and the transformer, and folder 702 is connected with earth connection 9 and forms the equipotential under arbitrary a set of pad foot 103 and the transformer.

And thirdly, the upper lead row 4 and the lower lead row 6 are connected with the corresponding transformer low-voltage lead row 703 through a lug or a cable.

Fourthly, a pressure cylinder is arranged between the upper clamping piece 701 of the transformer and the upper connecting seat 303, the upper yoke 3, the coil 2 and the lower yoke 1 are further pressed, and the vertical screw 5 is fastened again after the pressing, so that the upper yoke 3, the coil 2 and the lower yoke 1 are further pressed to form a whole, the vibration noise of the coil 2 is further reduced, and the short-circuit resistance is provided.

Five, will the utility model discloses put into oil tank 8 with transformer 7 together, the utility model discloses owing to adopt the optimization structure, current-limiting reactor size is very little, and oil tank 8 adopts standard rectangle oil tank, its width direction and transformer keep unanimous can, need not be the local installation space that enlarges of reactor.

Claims

1. A built-in current limiting reactor is characterized in that: comprises an upper yoke (3), a coil (2) and a lower yoke (1) which are sequentially arranged from top to bottom, wherein the upper yoke (3) is provided with an upper yoke, the upper side of the upper yoke is provided with an upper connecting seat (303), the interior of the upper yoke is provided with an upper silicon steel sheet, the upper silicon steel sheet is insulated from the upper yoke and is connected with the upper connecting seat (303), the upper connecting seat (303) is connected with a corresponding upper transformer clamping piece (701), the lower yoke (1) is provided with a lower yoke, the lower side of the lower yoke is provided with a pad foot (103), the interior of the lower yoke is provided with a lower silicon steel sheet, the lower silicon steel sheet is insulated from the lower yoke and is connected with a corresponding pad foot (103), the pad foot (103) is connected with a corresponding lower transformer clamping piece (702), a vertical screw (5) is arranged between the upper yoke (3) and the lower yoke (1), the upper end of the vertical screw (5) is fixedly connected with the corresponding upper connecting seat (303), the lower end of the vertical screw is fixedly connected with the corresponding pad foot (103), the outer side of the coil (2) is provided with an upper lead row (4) and a lower lead row (6), and the upper lead row (4) and the lower lead row (6) are respectively connected with the corresponding transformer low-voltage lead row (703).

2. The built-in current-limiting reactor according to claim 1, characterized in that: the coil (2) is a hollow spiral coil, and a single paper covered wire (201) is adopted as a conducting wire.

3. The built-in current-limiting reactor according to claim 2, characterized in that: the coil (2) is of a structure that a plurality of wires are wound in parallel, a Pange transposition mode is adopted among parallel winding wires, and the number of transposition times is the same as that of the parallel winding wires.

4. The built-in current-limiting reactor according to claim 3, characterized in that: an oil baffle plate (204) is arranged inside the coil (2).

5. The built-in current-limiting reactor according to claim 1, characterized in that: the upper yoke frame comprises an upper yoke web (301) and upper yoke horizontal screw rods (302), the two upper yoke webs (301) are respectively arranged on two sides of an upper silicon steel sheet, two ends of each upper yoke horizontal screw rod (302) are respectively connected with the upper yoke web (301) on the corresponding side, the upper yoke web (301) is insulated with the upper silicon steel sheet, the upper yoke horizontal screw rods (302) are insulated with the upper yoke webs (301), and the upper connecting seat (303) is arranged on the upper side of the upper yoke webs (301).

6. The built-in current-limiting reactor according to claim 1 or 5, characterized in that: the upper connecting seats (303) are insulated from the corresponding upper transformer clamping pieces (701), and any one group of upper connecting seats (303) and the upper transformer clamping pieces (701) are connected with the grounding wire (9).

7. The built-in current-limiting reactor according to claim 1, characterized in that: lower yoke includes yoke web (101) and yoke horizontal screw rod (102) down, and two yoke webs (101) are divided and are located silicon steel sheet both sides down, and yoke horizontal screw rod (102) both ends are connected with lower yoke web (101) that correspond the side respectively down, yoke web (101) are insulating with silicon steel sheet down, yoke horizontal screw rod (102) are insulating with lower yoke web (101) down, and yoke web (101) downside is located down in backing foot (103).

8. The built-in current-limiting reactor according to claim 1 or 7, characterized in that: the pad feet (103) and the transformer lower clamping piece (702) are insulated, and any one group of pad feet (103) and the transformer lower clamping piece (702) are connected with the grounding wire (9).

9. The built-in current-limiting reactor according to claim 1, characterized in that: the coil (2) is provided with an upper lead (202) and a lower lead (203), the upper lead (202) is connected with the upper lead row (4), and the lower lead (203) is connected with the lower lead row (6).

10. The built-in current-limiting reactor according to claim 1, characterized in that: and butterfly springs are arranged at two ends of the vertical screw rod (5), and a pressure cylinder is arranged between the transformer upper clamping piece (701) and the corresponding upper connecting seat (303).