阅读说明：本技术 杆上变压器的免停电更换方法 (Power-failure-free replacement method for pole-mounted transformer ) 是由 赵邦 周巨标 韩东 曾琦 吕文君 冯轲 费鸿韬 于 2021-09-08 设计创作，主要内容包括：本发明涉及一种杆上变压器的免停电更换方法,步骤如下：断开熔断器并拆除母线；在两电线杆根部安装下支撑座,在变压器横担下方安装上支撑座；在下支撑座前侧分别铰接吊臂,吊臂的下立柱与上立柱之间安装有螺杆升降机；两升降立柱的上部相向折弯且分别焊接有固定套管,将U形弯管的两端分别插入固定套管中锁定；将绞盘中的钢丝绳向上引出,绕过同侧定滑轮后,连接在同侧上立柱上；收紧钢丝绳将吊臂升起,U形弯管逐渐向后插入变压器顶部；在U形弯管的横管中部通过十字吊架吊住旧变压器；操纵螺杆升降机推动两升降立柱上升使旧变压器底部脱离变压器横担。该方法在保持高压线路供电的状态下,完成变压器的更换,操作简便且更换作业的安全性好。(The invention relates to a power failure-free replacement method of a pole-mounted transformer, which comprises the following steps: disconnecting the fuse and removing the bus; a lower supporting seat is arranged at the root of each of the two telegraph poles, and an upper supporting seat is arranged below the transformer cross arm; the front sides of the lower supporting seats are respectively hinged with a suspension arm, and a screw rod lifter is arranged between a lower upright post and an upper upright post of the suspension arm; the upper parts of the two lifting upright posts are oppositely bent and are respectively welded with a fixed sleeve, and two ends of the U-shaped bent pipe are respectively inserted into the fixed sleeves to be locked; the steel wire rope in the winch is led out upwards, bypasses the fixed pulley on the same side and is connected to the upright post on the same side; the steel wire rope is tightened to lift the suspension arm, and the U-shaped bent pipe is gradually inserted backwards into the top of the transformer; hanging the old transformer in the middle of a transverse pipe of the U-shaped bent pipe through a cross-shaped hanging bracket; the screw rod lifter is operated to push the two lifting upright posts to rise so that the bottom of the old transformer is separated from the cross arm of the transformer. The method completes the replacement of the transformer under the condition of keeping the power supply of the high-voltage line, and has the advantages of simple and convenient operation and good safety of replacement operation.)

1. A power failure-free replacement method of a pole-mounted transformer is characterized by sequentially comprising the following steps: s1, disconnecting the fuse above the transformer, and removing the high-voltage bus between the fuse and the transformer and the low-voltage bus between the transformer and the control cabinet;

s2, mounting lower supporting seats at the roots of the two telegraph poles, wherein winches for winding steel wire ropes are respectively arranged on the lower supporting seats;

s3, mounting an upper supporting seat below the cross arm of the transformer, wherein the upper supporting seat is respectively provided with a fixed pulley;

s4, respectively hinging a suspension arm at the front sides of the two lower supporting seats, wherein the suspension arm comprises a lower upright post, an upper upright post and a lifting upright post from bottom to top, and a screw rod lifter for driving the lifting upright post is arranged between the lower upright post and the upper upright post;

s5, bending the upper parts of the two lifting upright posts in opposite directions, respectively welding fixing sleeves, respectively inserting and locking two ends of the U-shaped bent tube into the fixing sleeves;

s6, leading out a steel wire rope in the winch upwards, and connecting the steel wire rope to the upright post on the same side after bypassing the fixed pulley on the same side;

s7, tightening the steel wire rope through a winch, gradually lifting the suspension arm, gradually inserting the U-shaped bent pipe backwards into the top of the transformer, and stopping lifting the suspension arm when the transverse pipe of the U-shaped bent pipe reaches the position right above the transformer;

s8, hanging a cross-shaped hanging bracket in the middle of the transverse pipe of the U-shaped bent pipe, and hanging the old transformer through the cross-shaped hanging bracket;

and S9, operating the screw rod lifter in the forward direction to push the lifting upright posts on the two sides to rise so that the bottom of the old transformer is separated from the cross arm of the transformer.

2. The method for blackout-free replacement of a pole transformer as recited in claim 1, further comprising the steps of: s10, releasing the steel wire rope through the winch, and gradually swinging the suspension arm downwards until the old transformer falls on the ground;

s11, removing the old transformer, and suspending the new transformer in the middle of the transverse pipe of the U-shaped bent pipe through the cross hanger;

s12, the steel wire rope is tightened again through the winch, the suspension arm is gradually lifted, and when the new transformer reaches the position right above the transformer cross arm, the suspension arm stops lifting;

and S13, operating the screw rod lifter reversely to enable the lifting upright posts on the two sides to descend, and enabling the bottom of the new transformer to fall on the cross arm of the transformer.

3. The method of claim 1, wherein the step of replacing the pole transformer comprises: the lower support seat comprises an upper hoop and a lower hoop which are respectively embraced at the root of the telegraph pole, the upper hoop and the lower hoop are respectively formed by connecting two halves which are encircled in opposite directions, front side lug seats are respectively welded on the front sides of the upper hoop and the lower hoop, a front connecting plate is welded between the upper front side lug seat and the lower front side lug seat, a hinged support extending forwards is welded on the lower portion of the front connecting plate, and the root of the lower upright post is hinged to the hinged support.

4. The blackout-free replacement method for the pole-mounted transformer according to claim 3, wherein: go up the staple bolt and weld respectively with the outside ear seat of staple bolt down, weld between two upper and lower outside ear seats and have an outer connecting plate, the capstan winch seat is installed respectively on the upper portion of outer connecting plate, the capstan winch is installed in the capstan winch seat, the outside of capstan winch seat is equipped with drive capstan winch pivoted capstan winch spanner respectively.

5. The method of claim 4, wherein the step of replacing the pole transformer comprises: the lifting screw rod of the screw rod lifter extends along the axis of the upper upright post, the top of the lifting screw rod is connected with a floating tray through a ball joint, and the lower end of the lifting upright post is closed, inserted in the upper upright post and abutted against the floating tray;

the outer side of the screw rod lifter is provided with a driving hand wheel, the driving hand wheel is fixed at one end of a worm, the worm is meshed with a worm wheel, a screw hole is formed in the center of the worm wheel, and the lifting screw rod is screwed in the central screw hole of the worm wheel.

6. The method of claim 4, wherein the step of replacing the pole transformer comprises: the top of the lifting upright post is welded with a fixed sleeve extending along the front-rear direction, and the bottom of the fixed sleeve is respectively welded with the front side and the rear side of the top of the lifting upright post through triangular rib plates; at least two sleeve locking screws capable of locking the U-shaped bent pipe are screwed at the top of the fixed sleeve.

7. The method of claim 6, wherein: a floating sleeve is sleeved in the middle of a transverse pipe of the U-shaped bent pipe, two sides of the floating sleeve are respectively provided with a positioning lantern ring, and a sleeve lifting lug is welded at the center of the bottom of the floating sleeve; the center of the cross-shaped hanging bracket is provided with a hook which extends upwards, and the hook is hung in the sleeve lifting lug.

8. The method of claim 1, wherein the step of replacing the pole transformer comprises: hanging rods are respectively arranged at four end parts of the cross-shaped hanging bracket, the upper ends of the hanging rods respectively penetrate through the corresponding hanging holes and are screwed in the hanging nuts, and the bottoms of the hanging nuts are pressed on the upper end surface of the cross-shaped hanging bracket; the lower end of each suspender is respectively provided with a suspension ring which can suspend the transformer.

9. The method of claim 1, wherein the step of replacing the pole transformer comprises: the upper supporting seat comprises two upper supporting seat hoops which are oppositely encircled, and the two upper supporting seat hoops are mutually connected through flanges and bolts; the outer wall of the hoop of the upper supporting seat on the outer side is welded with a square ear hoop, the fixed pulley is positioned in the inner cavity of the square ear hoop, a wheel shaft of the fixed pulley extends along the radial direction of the upper supporting seat, and two ends of the wheel shaft are welded on the inner wall of the square ear hoop and the outer wall of the corresponding hoop of the upper supporting seat; and a U-shaped groove with a downward opening is formed in the upper part of one side of the square ear hoop facing the transformer hoisting support.

10. The method of claim 1, wherein the step of replacing the pole transformer comprises: the steel wire rope between the fixed pulley and the suspension arm is sleeved with a rubber sleeve, and one end of the rubber sleeve facing the fixed pulley is connected with a rubber limiting disc.

Technical Field

The invention relates to a power failure-free replacement method of a pole-mounted transformer, and belongs to the technical field of field transmission line operation.

Background

The transformer is erected very generally by adopting concrete electric poles in an oil field or a place, and by taking the oil field as an example, two reinforced concrete electric poles with the height of 12 meters are adopted and are parallelly erected in a foundation pit at an interval of 2.4 meters, a high-voltage wire support is installed at the top between the two poles, and a three-phase high-voltage wire is installed on the high-voltage wire support. The insulator and the cross arm are installed below the high-voltage wire support, the fuse and the cross arm are installed downwards, the insulator and the cross arm are installed below the fuse, the transformer is installed below, the bottom of the transformer is installed on the transformer cross arm, the control cabinet is installed below the transformer cross arm, the bottom of the control cabinet is installed on the control cabinet cross arm, and two ends of each cross arm are respectively fixed on the wire pole. The high-voltage wire is connected with the high-voltage side of the transformer through the insulator and the drop-out fuse, the low-voltage side of the transformer is connected with a busbar of the control cabinet, and the high-voltage wire and the drop-out fuse form a pole upper transformer platform.

When the transformer fails or needs to be updated, the transformer needs to be replaced, the power supply of a high-voltage line is cut off in the traditional transformer replacing mode, then the old transformer is hoisted and unloaded by using a crane, a new transformer is hoisted, and the lead is reconnected. Because the insulator, the fuse and the high-voltage line are arranged above the transformer, the hook and the wire rope of the crane need to be prevented from colliding or being scratched with an appliance above the crane, and therefore the hook and the wire rope of the crane cannot be directly lifted from the position right above the transformer. The lifting hook can only deviate a distance and fall down from the front side of the transformer, a worker stands on a cross arm of the transformer to transversely pull the hook to the transformer, and then the hook hooks the short steel wire rope for lifting of the transformer. The height between the top of the transformer and the insulator cross arm above the transformer is only 1-1.5 m, and the large hook of the crane is pulled transversely, so that the steel wire rope of the crane is easily scratched with the fuse or the high-voltage wire above the crane, and the crane is very dangerous.

This type of mounting has the following problems: 1. because the distance between the top of the transformer and the cross arm of the insulator is limited, after the hook is hooked, a steel wire rope of the crane is in an inclined state, and the crane is very easy to collide with appliances and high-voltage wires above the crane by mistake. 2. Workers need to perform transverse pulling operation at high altitude, and the danger is high. 3. After the crane lifts, the gravity center of the transformer and the lifting point of the lifting arm are not on the same vertical line, and the transformer firstly breaks away from the cross arm of the transformer to move towards the lower part of the lifting point of the crane in the initial lifting stage, so that the transformer is greatly shaken and is dangerous. 4. The large crane is needed for operation, the suspension arm is lifted as much as possible, the inclination angle of the lifting rope is reduced, and the operation cost is high. And many oil production plants are in remote areas, so that the transportation is inconvenient.

Through investigation, at present, there is a replacement mode without power outage, that is, traction tools such as a chain block are adopted and hung at appropriate positions of two telegraph poles respectively, a control cabinet, a cross arm, a transformer and the cross arm are lowered and removed in sequence, then a new transformer is combined with the cross arm on the ground, the transformer is lifted to an appropriate height by using the traction tools, installation and fastening are carried out, then the control cabinet and the cross arm are installed, finally a wire is connected, and power supply is recovered. The method is not commonly adopted mainly because of the large dismantling range, the multiple working procedures, the increased labor intensity, the low construction efficiency and the high labor cost.

And another uninterrupted replacing mode is adopted, a slideway is built, traction tools such as a manual hoist and the like are used and hung at the proper positions of the two telegraph poles respectively, the old transformer is slowly lowered along the slideway, and the new transformer is slowly lifted to the cross arm. The disadvantages are: the slideway is heavy, the erection difficulty is high, the traction workload is huge, the transformer cannot be completely put in place, and the manual adjustment is difficult. The uninterrupted replacement operation is realized on the whole, but the construction efficiency and the labor intensity are not obviously improved.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provide a power-failure-free replacement method of a pole-mounted transformer, which is simple and convenient to operate and good in replacement safety, and the transformer can be replaced under the condition that the power supply of a high-voltage line is kept.

In order to solve the technical problems, the power-failure-free replacement method of the pole-mounted transformer sequentially comprises the following steps of: s1, disconnecting the fuse above the transformer, and removing the high-voltage bus between the fuse and the transformer and the low-voltage bus between the transformer and the control cabinet;

s2, mounting lower supporting seats at the roots of the two telegraph poles, wherein winches for winding steel wire ropes are respectively arranged on the lower supporting seats;

s3, mounting an upper supporting seat below the cross arm of the transformer, wherein the upper supporting seat is respectively provided with a fixed pulley;

s4, respectively hinging a suspension arm at the front sides of the two lower supporting seats, wherein the suspension arm comprises a lower upright post, an upper upright post and a lifting upright post from bottom to top, and a screw rod lifter for driving the lifting upright post is arranged between the lower upright post and the upper upright post;

s5, bending the upper parts of the two lifting upright posts in opposite directions, respectively welding fixing sleeves, respectively inserting and locking two ends of the U-shaped bent tube into the fixing sleeves;

s6, leading out a steel wire rope in the winch upwards, and connecting the steel wire rope to the upright post on the same side after bypassing the fixed pulley on the same side;

s7, tightening the steel wire rope through a winch, gradually lifting the suspension arm, gradually inserting the U-shaped bent pipe backwards into the top of the transformer, and stopping lifting the suspension arm when the transverse pipe of the U-shaped bent pipe reaches the position right above the transformer;

s8, hanging a cross-shaped hanging bracket in the middle of the transverse pipe of the U-shaped bent pipe, and hanging the old transformer through the cross-shaped hanging bracket;

and S9, operating the screw rod lifter in the forward direction to push the lifting upright posts on the two sides to rise so that the bottom of the old transformer is separated from the cross arm of the transformer.

As an improvement of the invention, the method also comprises the following steps: s10, releasing the steel wire rope through the winch, and gradually swinging the suspension arm downwards until the old transformer falls on the ground;

s11, removing the old transformer, and suspending the new transformer in the middle of the transverse pipe of the U-shaped bent pipe through the cross hanger;

s12, the steel wire rope is tightened again through the winch, the suspension arm is gradually lifted, and when the new transformer reaches the position right above the transformer cross arm, the suspension arm stops lifting;

and S13, operating the screw rod lifter reversely to enable the lifting upright posts on the two sides to descend, and enabling the bottom of the new transformer to fall on the cross arm of the transformer.

As a further improvement of the invention, the lower support seat comprises an upper anchor ear and a lower anchor ear which are respectively embraced at the root of the telegraph pole, the upper anchor ear and the lower anchor ear are respectively formed by connecting two halves which are encircled in opposite directions, front side ear seats are respectively welded at the front sides of the upper anchor ear and the lower anchor ear seat, a front connecting plate is welded between the upper front side ear seat and the lower front side ear seat, a hinge seat which extends forwards is welded at the lower part of the front connecting plate, and the root of the lower upright post is hinged on the hinge seat.

As a further improvement of the invention, outer side ear seats are respectively welded on the outer sides of the upper anchor ear and the lower anchor ear, an outer connecting plate is welded between the upper outer side ear seat and the lower outer side ear seat, a capstan seat is respectively installed on the upper part of the outer connecting plate, the capstan is installed in the capstan seat, and a capstan wrench for driving the capstan to rotate is respectively arranged on the outer side of the capstan seat.

As a further improvement of the invention, a lifting screw of the screw lifter extends along the axis of the upper upright post, the top of the lifting screw is connected with a floating tray through a ball joint, and the lower end of the lifting upright post is closed, inserted in the upper upright post and abutted against the floating tray; the outer side of the screw rod lifter is provided with a driving hand wheel, the driving hand wheel is fixed at one end of a worm, the worm is meshed with a worm wheel, a screw hole is formed in the center of the worm wheel, and the lifting screw rod is screwed in the central screw hole of the worm wheel.

As a further improvement of the invention, the top of the lifting upright post is welded with a fixed sleeve extending along the front-rear direction, and the bottom of the fixed sleeve is respectively welded with the front side and the rear side of the top of the lifting upright post through triangular rib plates; at least two sleeve locking screws capable of locking the U-shaped bent pipe are screwed at the top of the fixed sleeve.

As a further improvement of the invention, a floating sleeve is sleeved in the middle of a transverse pipe of the U-shaped bent pipe, two sides of the floating sleeve are respectively provided with a positioning lantern ring, and the center of the bottom of the floating sleeve is welded with a sleeve lifting lug; the center of the cross-shaped hanging bracket is provided with a hook which extends upwards, and the hook is hung in the sleeve lifting lug.

As a further improvement of the invention, four ends of the cross-shaped hanger are respectively provided with a hanger rod, the upper end of each hanger rod respectively passes through the corresponding suspension hole and is screwed in a suspension nut, and the bottom of the suspension nut is pressed on the upper end surface of the cross-shaped hanger; the lower end of each suspender is respectively provided with a suspension ring which can suspend the transformer.

As a further improvement of the invention, the upper supporting seat comprises two upper supporting seat hoops which are oppositely encircled, and the two upper supporting seat hoops are mutually connected through a flange and a bolt; the outer wall of the hoop of the upper supporting seat on the outer side is welded with a square ear hoop, the fixed pulley is positioned in the inner cavity of the square ear hoop, a wheel shaft of the fixed pulley extends along the radial direction of the upper supporting seat, and two ends of the wheel shaft are welded on the inner wall of the square ear hoop and the outer wall of the corresponding hoop of the upper supporting seat; and a U-shaped groove with a downward opening is formed in the upper part of one side of the square ear hoop facing the transformer hoisting support.

As a further improvement of the invention, a rubber sleeve is sleeved on the steel wire rope between the fixed pulley and the suspension arm, and one end of the rubber sleeve facing the fixed pulley is connected with a rubber limiting disc.

Compared with the prior art, the invention has the following beneficial effects: the lifting device is assembled on the basis of the telegraph poles provided with the transformers, a door-shaped truss structure is formed between the two telegraph poles, the winch wrench at the lower parts of the two telegraph poles is manually operated, the two suspension arms are drawn in through the two steel wire ropes, the transformer lifting support keeps the posture unchanged in the lifting or descending process of the suspension arms, the suspension point is always kept right above the gravity center of the transformer, and the gravity center is always kept stable and cannot swing in the processes of dismantling and upper loading of the transformer. The transformer hoisting bracket can freely enter and exit a space between the top of the transformer and the insulator cross arm, and appliances above the insulator cross arm are not dangerous and do not need to be dismantled; the control cabinet below the cross arm of the transformer does not need to be dismantled. In the construction process, the high-voltage line does not need to be powered off, a large crane does not need to enter the field, and the high-voltage line is particularly suitable for field operation in remote areas.

Drawings

The invention will be described in further detail with reference to the following drawings and detailed description, which are provided for reference and illustration purposes only and are not intended to limit the invention.

Fig. 1 is a front view of the first working state of the present invention.

Fig. 2 is a left side view of fig. 1.

Fig. 3 is a perspective view of fig. 1.

Fig. 4 is a left side view of the second working state of the present invention.

Fig. 5 is a perspective view of fig. 4.

Fig. 6 is a rear view of the present invention.

Fig. 7 is a right side view of fig. 6.

Fig. 8 is a perspective view of fig. 7.

Fig. 9 is a partial exploded view of fig. 8.

Fig. 10 is a perspective view of a cross hanger of the present invention.

In the figure: 1. a lower support seat; 1a, installing an anchor ear; 1b, a lower hoop; 1c, a front ear mount; 1d, a front connecting plate; 1e, hinging seat; 1f, outer ear mount; 1g, an outer connecting plate; 2. a winch; 2a, a capstan base; 2b. a winch wrench; 3. a suspension arm; 3a, a lower upright post; 3b, upper upright posts; 3b1. hanging a lug; 3b2. upright locking screw; 3c, lifting the upright post; 3c1. triangular rib plates; 4. a screw elevator; 4a, lifting screw rods; 4b, driving a hand wheel; 4c, floating the tray; 5. fixing the sleeve; 5a sleeve locking screw; 6, U-shaped bent pipe; 6a, floating sleeve; 6b, casing lifting lugs; 6c, positioning a lantern ring; 7. a cross-shaped hanging bracket; 7a, hanging hooks; 7b, hanging nuts; 7c, a hanger rod; 7d, hanging rings; 8. an upper support base; 8a, an upper supporting seat hoop; 8b, square ear loops; 8b1. u-shaped groove; 8c, a fixed pulley; 9. a wire rope; 10. a rubber limiting disc; 10a, a rubber sleeve; 11. a utility pole; 12. a high-voltage wire support; 13. a high-voltage line; 14. an insulator; 15. an insulator cross arm; 16. a fuse; 17. a fuse cross arm; 18. a transformer; 19. a transformer cross arm; 20. a control cabinet; 21. control cabinet cross arm.

Detailed Description

As shown in fig. 1 to 10, the tooling used in the present invention comprises a lower support base 1 and an upper support base 8, wherein the lower support base 1 is respectively fixed at the root of two telegraph poles 11, the upper support base 8 is respectively fixed on the telegraph poles 11 and is positioned below a transformer cross arm 19, the front side of the lower support base 1 is respectively hinged with an upwardly extending boom 3, the outer end of the upper support base 8 is respectively fixed with a fixed pulley 8c, a steel wire rope 9 is respectively connected to the upper part of the boom 3 by bypassing the fixed pulley 8c, and a transformer hoisting support is installed between the two booms 3.

The upper supporting seat 8 comprises two upper supporting seat hoops 8a which are enclosed oppositely, and the two upper supporting seat hoops 8a are connected with each other through flanges and bolts and are enclosed on the telegraph pole 11. The outer wall welding of support seat staple bolt 8a has square ear hoop 8b on the outside, and fixed pulley 8c is located the inner chamber of square ear hoop 8b, and the shaft of fixed pulley 8c is followed the radial extension of upper support seat 8 and the shaft both ends weld in the inner wall of square ear hoop 8b and the corresponding outer wall of upper support seat staple bolt 8a.

The upper part of one side of the square ear hoop 8B facing the transformer lifting bracket is provided with a U-shaped groove 8B1 with a downward opening, a steel wire rope 9 wrapped on the fixed pulley 8c passes through the U-shaped groove 8B1 on the square ear hoop 8B to be connected with the upper part of the suspension arm 3, and the other end of the steel wire rope 9 is downwards wound on the winch 2.

The width of the upper supporting seat hoop 8a needs to be larger than one third of the inner diameter of the hoop, and the flanges on each side are connected with each other through two pairs of bolts so as to improve the strength of the upper supporting seat hoop and the square ear hoops 8b and increase the stability of the fixed pulley 8c in the working process.

The lower supporting seat 1 comprises an upper hoop 1a and a lower hoop 1b which are respectively embraced at the root of a telegraph pole 11, the upper hoop 1a and the lower hoop 1b are respectively formed by connecting two halves which are encircled in opposite directions, front side lug seats 1c are respectively welded on the front sides of the upper hoop 1a and the lower hoop 1b, a front connecting plate 1d is welded between the upper front side lug seat 1c and the lower front side lug seats 1c, a hinge seat 1e which extends forwards is welded on the lower portion of the front connecting plate 1d, and the root of a suspension arm 3 is hinged on the hinge seat 1e.

Outer side ear seats 1f are welded on the outer sides of the upper anchor ear 1a and the lower anchor ear 1b respectively, an outer connecting plate 1g is welded between the upper outer side ear seat 1f and the lower outer side ear seat 1f, a capstan base 2a is installed on the upper portion of the outer connecting plate 1g respectively, a capstan 2 is installed in the capstan base 2a respectively, the root of a steel wire rope 9 is wound on the capstan 2 respectively, and a capstan wrench 2b for driving the capstan 2 to rotate is arranged on the outer side of the capstan base 2a respectively.

The anchor ear 1a and the anchor ear 1b can increase the height of lower carriage seat 1 down in the setting, go up anchor ear 1a and link as an organic whole with outer connecting plate 1g through preceding connecting plate 1d with lower anchor ear 1b, make lower carriage seat 1 have fine rigidity, can bear great load. The phase difference between the front side ear seat 1c and the outer side ear seat 1f is 90 degrees, the front side ear seat and the outer side ear seat can be welded on the same half of the hoop arcs, and the other half of the hoop arcs are connected with the flange through bolts and fixed after being surrounded, so that the lower support seat 1 is fixed at the root of the telegraph pole 11.

The wire ropes 9 can be retracted and extended by rotating the winch 2 through the winch wrench 2b, the two wire ropes 9 are retracted and extended synchronously, and after the steering of the fixed pulley 8c, the other end of the wire rope 9 pulls the upper parts of the two suspension arms 3 to lift or fall synchronously.

As shown in fig. 9, the suspension arm 3 includes a lower upright 3a, an upper upright 3b and a lifting upright 3c, the lower end of the lower upright 3a is hinged on the hinged support 1e through a pin shaft, a screw lifter 4 is installed between an upper flange of the lower upright 3a and a lower flange of the upper upright 3b, a lifting screw 4a of the screw lifter 4 extends along the axis of the upper upright 3b, the top of the lifting screw 4a is connected with a floating tray 4c through a ball joint, the lower end of the lifting upright 3c is closed, inserted in the upper upright 3b and abuts against the floating tray 4c, and the transformer lifting bracket is fixed between the tops of the two lifting uprights 3 c; the rear wall of the upper part of the upper upright post 3b is welded with a hanging lug 3b1, and the upper ends of the steel wire ropes 9 are respectively fixed on the corresponding hanging lugs 3b1.

The lower upright post 3a, the upper upright post 3b and the lifting upright post 3c can adopt square tubes, the lower part of the lifting upright post 3c is inserted into the upper upright post 3b to be lifted, and meanwhile, the upper upright post 3b plays a role in guiding the lifting of the lifting upright post 3c.

The outer side of the screw rod lifter 4 is provided with a driving hand wheel 4b, the driving hand wheel 4b is fixed at one end of a worm, the worm is meshed with a worm wheel, the center of the worm wheel is provided with a screw hole, and the lifting screw rod 4a is screwed in the central screw hole of the worm wheel. The worm is driven to rotate through the driving hand wheel 4b, the worm drives the worm wheel to rotate and decelerate, the position is kept still due to the rotation of the central screw hole of the worm wheel, the lifting screw rod 4a rotates and can lift, the floating tray 4c is driven by the lifting screw rod 4a to lift but does not rotate along with the lifting screw rod, the periphery of the floating tray 4c is attached to the inner wall of the upper upright post 3b to float, the guiding effect can be achieved, and the deflection is avoided.

As shown in fig. 6, 8 and 9, the upper parts of the lifting columns 3c are bent upwards and oppositely, the top parts of the lifting columns 3c are welded with fixing sleeves 5 extending along the front and rear directions, and the bottom parts of the fixing sleeves 5 are respectively welded with the front and rear sides of the top parts of the lifting columns 3c through triangular rib plates 3c 1; the transformer hoisting support comprises a U-shaped bent pipe 6 and a cross-shaped hanging bracket 7, the U-shaped bent pipe 6 is provided with a forward opening, two ends of the U-shaped bent pipe are inserted into the fixed sleeve 5, and the top of the fixed sleeve 5 is screwed with at least two sleeve locking screws 5a capable of locking the U-shaped bent pipe 6. Triangular rib plates are respectively welded at two corners of the U-shaped bent pipe 6 to improve the strength.

The middle part of the transverse pipe of the U-shaped bent pipe 6 is sleeved with a floating sleeve 6a, two sides of the floating sleeve 6a are respectively provided with a positioning lantern ring 6c, and the center of the bottom of the floating sleeve 6a is welded with a sleeve lifting lug 6b.

The front end of the U-shaped bent pipe 6 is inserted into a fixing sleeve 5 at the top of the lifting upright post 3c and is fixed by a sleeve locking screw 5a, so that a certain distance is kept between the horizontal pipe of the U-shaped bent pipe 6 and the top of the lifting upright post 3c. The floating sleeve 6a can adjust the axial position on the horizontal tube of the U-shaped elbow 6 to ensure that the floating sleeve is located at the central position, then the positioning lantern ring 6c leans against the floating sleeve 6a from two sides to lock the screw, the position of the floating sleeve 6a is fixed, and the lifting lug is located more backward than the top of the lifting upright 3c.

As shown in fig. 10, the center of the cross-shaped hanger 7 is provided with a hook 7a extending upward, and the hook 7a is hung in the casing lifting lug 6 b; suspenders 7c are respectively arranged at four ends of the cross-shaped hanger 7, the upper end of each suspender 7c respectively penetrates through a corresponding suspension hole and is screwed in a suspension nut 7b, and the bottom of the suspension nut 7b is pressed on the upper end surface of the cross-shaped hanger 7; the lower ends of the suspension rods 7c are provided with suspension rings 7d for suspending the transformer 18.

The four corners of the transformer 18 are symmetrically provided with L-shaped lifting lugs with downward openings, the cross-shaped lifting frame 7 is convenient for lifting the transformer 18 in a balanced manner, the height of the lifting rod 7c can be adjusted through the suspension nut 7b, and when the hook 7a is suspended in the sleeve lifting lug 6b, the gravity centers of the sleeve lifting lug 6b, the cross-shaped lifting frame 7 and the transformer 18 are positioned on a vertical line, namely the gravity center of the transformer 18 is positioned right below the sleeve lifting lug 6b.

Slings can be arranged at the four ends of the cross-shaped hanger 7 respectively, the upper ends of the slings respectively penetrate through the corresponding suspension holes and are fixed in the upper chuck, and the bottom of the upper chuck is pressed on the upper end surface of the cross-shaped hanger 7; hanging rings 7d capable of hanging the transformer 18 are provided at the lower ends of the respective slings. The sling has certain flexibility, so that the hanging ring 7d at the lower end is hooked on the L-shaped lifting lugs at the four corners of the transformer 18.

As shown in fig. 1 to 3, as the boom 3 is raised gradually, the U-bend 6 moves backward from between the two poles 11 and is inserted into the space between the transformer 18 and the insulator cross arm 15 gradually, and when the sleeve lugs 6b reach the position right above the transformer 18, the boom 3 stops raising, and at this time, the boom 3 still forms a certain angle with the poles 11 and there is no interference. Next, the cross hanger 7 is hung on the casing lifting lug 6b by the hook 7a.

The lifting screw rods 4a of the two screw rod lifters 4 are slightly lifted by synchronously rotating the two driving hand wheels 4b in the positive direction, the lifting upright columns 3c on the two sides are slightly lifted upwards by the floating tray 4c to one end height, the bottom of the transformer 18 is separated from the transformer cross arm 19 by a small distance, and the weight of the transformer 18 is completely suspended by the U-shaped bent pipe 6; the lifting column 3c is fixed by a column locking screw 3b2 which is tightened to the outer wall of the upper column 3b.

Then the winch wrench 2b is rotated reversely, the winch 2 rotates reversely to release the steel wire rope 9, the suspension arm 3 swings downwards gradually, and in the process of lowering the old transformer, the floating sleeve 6a can rotate on the transverse pipe of the U-shaped bent pipe 6 to ensure that the sleeve lifting lug 6b is always positioned right below the axis of the floating sleeve 6a, and the old transformer is always kept in a vertical suspension state.

As shown in fig. 4 to 8, after the old transformer falls to the ground, the new transformer is suspended on the casing hanger 6b in the middle of the horizontal pipe of the U-shaped bent pipe 6 through the cross hanger 7, then the winch wrench 2b is rotated forward, the winch 2 rotates forward to tighten the steel wire rope 9, the suspension arm 3 swings upward gradually, and in the ascending process, the new transformer is always in a vertical suspension state and is stable.

The U-bend 6 is moved backwards from between the poles 11 and is gradually inserted under the insulator cross arm 15, and when a new transformer reaches right above the transformer cross arm 19, the boom 3 stops lifting.

Then, the column locking screw 3b2 on the outer wall of the upper column 3b is unscrewed to unlock the lifting column 3c, the lifting screw rods 4a of the two screw rod lifters 4 slightly fall down by synchronously and reversely rotating the two driving hand wheels 4b, the lifting column 3c slightly falls down for a certain distance under the action of gravity, the bottom of the transformer falls on the transformer cross arm 19, and thus, the new transformer is positioned.

A rubber sleeve 10a is sleeved on the steel wire rope 9 between the fixed pulley 8c and the suspension arm 3, and one end of the rubber sleeve 10a facing the fixed pulley 8c is connected with a rubber limiting disc 10. The rubber sleeve 10a and the rubber limiting disc 10 move along with the steel wire ropes 9, so that whether the two steel wire ropes are synchronous or not can be observed conveniently; when the rubber limiting disc 10 is close to the upper supporting seat 8, the sleeve lifting lug 6b can be determined to reach the position right above the transformer, and the old transformer is lifted from the transformer cross arm 19 to be stable, so that the old transformer cannot shake; or the new transformer is dropped on the transformer cross arm 19, and the dropping position is very accurate.

The invention discloses a power failure-free replacement method of a pole-mounted transformer, which sequentially comprises the following steps: s1, disconnecting the fuse above the transformer, and the high-voltage wire 13 above the fuse 16 does not need to be powered off; removing a high-voltage bus between the fuse and the transformer and a low-voltage bus between the transformer and the control cabinet;

s2, mounting lower supporting seats 1 at the roots of the two telegraph poles, and respectively arranging winches 2 for winding steel wire ropes 9 on the lower supporting seats 1;

s3, installing an upper supporting seat 8 below the transformer cross arm 19, and respectively arranging fixed pulleys on the upper supporting seat 8;

s4, respectively hinging a suspension arm 3 at the front sides of the two lower supporting seats 1, wherein the suspension arm 3 comprises a lower upright post 3a, an upper upright post 3b and a lifting upright post 3c from bottom to top, and a screw rod lifter 4 for driving the lifting upright post 3c is arranged between the lower upright post 3a and the upper upright post 3 b;

s5, bending the upper parts of the two lifting upright posts 3c oppositely, welding fixing sleeves respectively, and inserting and locking the two ends of the U-shaped bent pipe 6 into the fixing sleeves respectively;

s6, the steel wire rope 9 in the winch 2 is led out upwards, and is connected to the upright post 3b on the same side after bypassing the fixed pulley on the same side;

s7, tightening the steel wire rope 9 through the winch 2, gradually lifting the suspension arm 3, gradually inserting the U-shaped bent pipe 6 backwards into the top of the transformer, and stopping lifting the suspension arm 3 when the transverse pipe of the U-shaped bent pipe 6 reaches the position right above the transformer;

s8, hanging a cross-shaped hanging bracket 7 in the middle of the transverse pipe of the U-shaped bent pipe 6, and hanging the old transformer through the cross-shaped hanging bracket 7;

and S9, operating the screw rod lifter 4 in the forward direction to push the lifting upright posts 3c at the two sides to ascend so that the bottom of the old transformer is separated from the transformer cross arm 19.

The new transformer is in place, and the method further comprises the following steps: s10, releasing the steel wire rope 9 through the winch 2, and gradually swinging the suspension arm 3 downwards until the old transformer falls on the ground;

s11, removing the old transformer, and suspending the new transformer in the middle of the transverse pipe of the U-shaped bent pipe 6 through the cross hanger 7;

s12, the steel wire rope 9 is tightened again through the winch 2, the suspension arm 3 is gradually lifted, and when a new transformer reaches the position right above the transformer cross arm 19, the suspension arm 3 stops lifting;

s13, the screw lifter 4 is operated in the reverse direction to lower the lifting columns 3c on both sides, and the bottom of the new transformer falls on the transformer cross arm 19.

In the processes of disassembling the old transformer and positioning the new transformer, the transverse pipe of the U-shaped bent pipe 6 only advances and retreats in a narrow space of 1-1.5 meters between the top of the transformer and the insulator cross arm 15 above the transformer, and the fuse 16, the insulator cross arm 15, the insulator 14, the high-voltage wire 13 and the high-voltage wire support 12 above the fuse cross arm 17 are not affected and have no risk of scratching. And the control cabinet 20 and the control cabinet cross arm 21 below the transformer cross arm 19 have no risk of scratching or collision.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.