Dry-type transformer with monitoring and protecting functions

Abstract

The utility model discloses a dry-type transformer with monitoring and protecting functions, which belongs to the technical field of transformers and comprises a transformer, a support and a movable support, a low-voltage end of the transformer is provided with a low-voltage mutual inductor fixedly connected with the support, and a high-voltage end of the transformer is provided with a high-voltage mutual inductor. The supporting bracket and the movable bracket are fixedly connected and jointly erected on the outer surface of the transformer; the movable bracket comprises the following structures: a horizontal slide rail which is fixedly connected with the supporting bracket and extends horizontally, a fixed frame is erected at the top of the horizontal slide rail, a plurality of first pulleys which slide along the horizontal slide rail are arranged on the side surface of the fixed frame, and a vertical slide rail which extends downwards and is matched with the first pulleys is arranged at the end part of the horizontal slide rail; the high-voltage mutual inductor is fixedly connected with the fixed frame; current protection is provided for the transformer through the current transformer, and the stability of an electric power system can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a dry-type transformer with monitoring and protection functions. Background Art

[0002] As an important equipment in the power system, the stable operation of the transformer is crucial to the normal operation of the power system. In order to ensure the safe and stable operation of the transformer, its current needs to be accurately measured and monitored. Usually, a current transformer is installed in the transformer. As a high-precision, fast-response and anti-interference electrical equipment, the current transformer can accurately convert the large current on the primary side of the transformer into the small current on the secondary side, providing important data for the monitoring, control and protection of the power system. Current transformers are usually divided into low-voltage current transformers and high-voltage current transformers. In order to reduce the space occupied by the transformer, the current transformer is usually installed on the top of the transformer. The volume and weight of the high-voltage current transformer are usually large, and it is more difficult to replace or disassemble it for maintenance.

[0003] Chinese patent publication number CN217035358U discloses an excitation transformer structure, comprising an iron core, a low-voltage coil and a high-voltage coil wrapped around the iron core from the inside out, which are installed in a transformer box, upper clamps are installed on the front and rear sides of the upper iron yoke of the iron core, and lower clamps are installed on the front and rear sides of the lower iron yoke of the iron core, and brackets are respectively installed on the front and rear upper clamps, and the front and rear brackets are connected and fixed together by double-headed screws. A high-voltage side current transformer is installed on the bracket on one side, and a low-voltage side current transformer is installed on the bracket on the other side; in the above-mentioned transformer, the high-voltage side current transformer is installed above the high and low voltage coils, which can avoid the transformer occupying too much space, but the high-voltage side current transformer is installed at a higher position and weighs more, which makes it difficult to perform routine maintenance, disassembly and repair, replacement, etc., so the transformer still has room for improvement. Utility Model Content

[0004] In view of the technical defects existing in the background technology, the present invention proposes a dry-type transformer with monitoring and protection functions, which solves the above technical problems and meets the actual needs. The specific technical solution is as follows:

[0005] A dry-type transformer with monitoring and protection functions, comprising a transformer, a support bracket, and a movable bracket. The low-voltage end of the transformer is provided with a low-voltage mutual inductor fixedly connected to the support bracket, and the high-voltage end of the transformer is provided with a high-voltage mutual inductor. The support bracket and the movable bracket are fixedly connected and are jointly mounted on the outer surface of the transformer.

[0006] The movable bracket includes the following structure: a horizontal slide rail fixedly connected to the support bracket and extending horizontally, a fixed frame is mounted on the top of the horizontal slide rail, a plurality of first pulleys sliding along the horizontal slide rail are provided on the side of the fixed frame, and a vertical slide rail extending downward and matching the first pulley is provided at the end of the horizontal slide rail; the high-voltage transformer is fixedly connected to the fixed frame.

[0007] As a further technical solution of the present invention, the horizontal slide rail is composed of an upper slide rail and a lower slide rail distributed up and down, the first pulley is composed of an upper pulley sliding along the upper surface of the upper slide rail and a lower pulley sliding along the upper surface of the lower rail, and the lower pulley is provided with a second pulley sliding along the lower surface of the lower rail and movably connected to the fixed frame on the side away from the vertical slide rail.

[0008] As a further technical solution of the present invention, the vertical slide rail is provided with a first notch matching the first pulley on one side close to the end of the horizontal slide rail, and the first notch connects the horizontal slide rail and the vertical slide rail to each other.

[0009] As a further technical solution of the present invention, a third pulley sliding along the lower surface of the upper slide rail is provided on the side of the fixed frame, and a second notch matching the third pulley is provided on the side of the vertical slide rail close to the end of the horizontal slide rail.

[0010] As a further technical solution of the present invention, a lifting rod extending upward is provided at the bottom of the vertical slide rail, and a support plate is provided at the top of the lifting rod. The support plate is located at the intersection of the horizontal slide rail and the vertical slide rail.

[0011] As a further technical solution of the present invention, a lifting bracket is provided at the bottom of the vertical slide rail, and one side of the lifting bracket is movably connected to a driving gear by a shaft rod, and the lifting bracket is movably connected to a lifting gear that meshes with the driving gear by a bearing, and a threaded hole passes through the axis of the lifting gear, and a threaded hole is provided on the surface of the lifting rod that matches the threaded hole and the bottom passes through the threaded hole.

[0012] As a further technical solution of the present invention, the driving gear axis is fixedly connected to a hand crank handle using a shaft.

[0013] As a further technical solution of the present invention, a limit block is provided at one end of the horizontal slide rail close to the supporting bracket.

[0014] The beneficial effects of the present invention are:

[0015] The transformer of the utility model provides current protection for the transformer through accurate measurement and monitoring of current by low-voltage mutual inductors and high-voltage mutual inductors, which is beneficial to improving the stability of the power system. The high-voltage mutual inductor, which is larger in volume and weight, is fixed by a fixed frame. The fixed frame can move along the horizontal slide rail and then move downward along the vertical slide rail to lower the height of the high-voltage mutual inductor and move it to one side of the transformer at the same time, making it convenient for staff to repair or disassemble and replace the high-voltage mutual inductor, thereby improving the operating efficiency during the inspection or maintenance of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of a dry-type transformer with monitoring and protection functions.

[0017] Figure 2 The present invention is a schematic structural diagram of a high-voltage transformer of a dry-type transformer with monitoring and protection functions after the height is reduced.

[0018] Figure 3 The present invention is a structural diagram of a movable bracket of a dry-type transformer with monitoring and protection functions.

[0019] Among them: 1-transformer, 11-low-voltage transformer, 12-high-voltage transformer, 2-support bracket, 3-movable bracket, 31-horizontal slide rail, 311-upper slide rail, 312-lower slide rail, 32-fixed frame, 33-first pulley, 331-upper pulley, 332-lower pulley, 34-vertical slide rail, 341-first notch, 342-second notch, 35-second pulley, 36-third pulley, 37-limiting block, 4-lifting rod, 41-support plate, 5-lifting bracket, 51-driving gear, 52-lifting gear, 53-hand crank handle. DETAILED DESCRIPTION

[0020] The following describes the implementation of the present invention in conjunction with the accompanying drawings and relevant embodiments. The implementation of the present invention is not limited to the following embodiments, and the present invention involves relevant necessary components in this technical field, which should be regarded as common knowledge in this technical field and can be known and mastered by technical personnel in this technical field.

[0021] like Figure 1-3As shown, a dry-type transformer with monitoring and protection functions includes a transformer 1, a support bracket 2, and a movable bracket 3. The low-voltage end of the transformer 1 is provided with a low-voltage mutual inductor 11 fixedly connected to the support bracket 2, and the high-voltage end of the transformer 1 is provided with a high-voltage mutual inductor 12. The support bracket 2 is fixedly connected to the movable bracket 3 and is jointly mounted on the outer surface of the transformer 1; the movable bracket 3 includes the following structure: a horizontal slide rail 31 fixedly connected to the support bracket 2 and extending horizontally, a fixed frame 32 is mounted on the top of the horizontal slide rail 31, and a plurality of first pulleys 33 sliding along the horizontal slide rail 31 are provided on the side of the fixed frame 32, and a vertical slide rail 34 extending downward and matching the first pulley 33 is provided at the end of the horizontal slide rail 31; the high-voltage mutual inductor 12 is fixedly connected to the fixed frame 32.

[0022] The transformer 1 of the present invention uses a dry-type transformer, the low-voltage transformer 11 uses a low-voltage current transformer, and the high-voltage transformer 12 uses a high-voltage current transformer. The support bracket 2 and the movable bracket 3 together form a bracket similar to a tic-tac-toe and fix the low-voltage transformer 11 and the high-voltage transformer 12. The current transformer measures the current at the low-voltage end or the high-voltage end of the transformer 1, and can also accurately measure and monitor the current, so as to timely discover potential faults in the power system and provide important data for the monitoring and scheduling of the power system. When the transformer is overloaded or short-circuited, the current transformer can quickly sense the current abnormality and trigger the protection device to cut off the fault current, thereby protecting the transformer 1 from damage. The current transformer provides current protection for the transformer by accurately measuring and monitoring the current, which is beneficial to improving the stability of the power system.

[0023] The high-voltage transformer 12 of the present invention is fixed in the fixed frame 32 by fixing bolts. The fixed frame 32 is fixed by a plurality of horizontal bars and vertical bars to form a structure with a hexahedron outline. The fixed frame 32 is mounted on the top of at least two horizontal slide rails 31 through a plurality of first pulleys 33 on both sides. The first pulley 33 can be driven by a motor to rotate so that the fixed frame 32 moves along the horizontal slide rail 31 or the vertical slide rail 34. There are two vertical slide rails 34, and one side of each vertical slide rail 34 can be set as a rack structure, and the first pulley 33 is set as a gear meshing with the rack, so that the first pulley 33 can move along the vertical slide rail 34. Due to the weight of the high-voltage transformer 12 and the The volume is large. When the high-voltage transformer 12 needs to be disassembled for maintenance or replacement, the connection line between the high-voltage transformer 12 and the transformer 1 is disconnected, and the fixed frame 32 is driven by the motor to move along the horizontal slide rail 31 to the vertical slide rail 34, so that the high-voltage transformer 12 is away from directly above the transformer 1. Then the fixed frame 32 moves downward along the vertical slide rail 34 to lower the height of the high-voltage transformer 12. At this time, the height of the high-voltage transformer 12 has been lowered and is located on one side of the transformer 1. The staff can repair or disassemble and replace it more conveniently. After completing the maintenance or disassembling and replacing the new high-voltage transformer 12, the reverse operation is performed to move it to the top of the transformer 1 and reconnect the line.

[0024] Furthermore, the horizontal slide rail 31 is composed of an upper slide rail 311 and a lower rail 312 distributed up and down. The upper slide rail 311 and the lower rail 312 are each provided with two wheels. The first pulley 33 is composed of an upper pulley 331 that slides along the upper surface of the upper slide rail 311 and a lower pulley 332 that slides along the upper surface of the lower rail 312. The lower pulley 332 is provided with a second pulley 35 that slides along the lower surface of the lower rail 312 and is movably connected to the fixed frame 32 on the side away from the vertical slide rail 34. The upper pulley 331, the lower pulley 332, and the second pulley 35 are all located on the side of the fixed frame 32 away from the vertical slide rail 34. The upper pulley 331, the lower pulley 332, and the second pulley 35 enable the fixed frame 32 to have three fulcrums forming a triangle in the upper slide rail 311 and the lower rail 312 on the same side, thereby improving the stability of the fixed frame 32 during movement.

[0025] After adopting the above structure, it needs to be further explained that the vertical slide rail 34 is provided with a first notch 341 matching the first pulley 33 on one side near the end of the horizontal slide rail 31. The first notch 341 connects the horizontal slide rail 31 and the vertical slide rail 34 to each other. The first notch 341 allows the first pulley 33 to smoothly leave the horizontal slide rail 31 and enter the vertical slide rail 34. At this time, the second pulley 35 abuts against the outer side of the vertical slide rail 34, which can avoid the fixed frame 32 from swinging when entering the vertical slide rail 34. When the fixed frame 32 can move downward along the vertical slide rail 34, the first pulley 33 slides in the vertical slide rail 34, and the second pulley 35 slides along the outer side of the vertical slide rail 34, which can improve the stability of the fixed frame 32 during movement.

[0026] In order to further improve the stability of the fixed frame 32 during its movement on the horizontal slide rail 31, a plurality of first pulleys 33 are also provided on the side of the fixed frame 32 close to the vertical slide rail 34. At this time, the first notch 341 needs to penetrate to the other side. These first pulleys 33 can move along the first notch 341 to the outside of the vertical slide rail 34 until the first pulley 33 on the side of the fixed frame 32 away from the vertical slide rail 34 can successfully enter the vertical slide rail 34, so that the fixed frame 32 can move downward along the vertical slide rail 34.

[0027] like Figure 1-3 As shown, as one of the preferred embodiments of the present invention, a third pulley 36 is provided on the side of the fixed frame 32, which slides along the lower surface of the upper slide rail 311. The third pulley 36 is located on the side of the fixed frame 32 away from the vertical slide rail 34 and is on the same vertical line as the first pulley 33. The third pulley 36 can further improve the stability of the fixed frame 32 during the movement along the horizontal slide rail 31. The vertical slide rail 34 is provided with a second notch 342 that matches the third pulley 36 on the side close to the end of the horizontal slide rail 31. The second notch 342 allows the third pulley 36 to smoothly enter the vertical slide rail 34, so that the fixed frame 32 can move downward along the vertical slide rail 34 and lower the height of the high-voltage transformer 12, and the third pulley 36 can improve the stability of the fixed frame 32 during the movement along the vertical slide rail 34.

[0028] like Figure 1-3When the lifting rod 32 is lifted up, the lifting plate 41 is lifted and lowered, so that the lifting frame 32 can be lifted up and lowered, thereby preventing the lifting frame 32 from falling down.

[0029] like Figure 1-3 As shown, as one of the preferred embodiments of the present invention, a lifting bracket 5 is provided at the bottom of the vertical slide rail 34, and a driving gear 51 is movably connected to the lifting bracket 5 on one side of the lifting bracket 5 by a shaft rod, and a lifting gear 52 that meshes with the driving gear 51 is movably connected to the lifting bracket 5 by a bearing. The axis of the lifting gear 52 passes through a threaded hole, and the surface of the lifting rod 4 is provided with a thread matching the threaded hole and the bottom passes through a threaded hole; the lifting rod 4 of the present invention is a threaded rod and is provided with two, and the driving gear 51 and the lifting gear 52 are respectively provided with two and matched in pairs. The driving gear 51 can rotate synchronously under the drive of the motor, and the lifting gear 52 is rotated synchronously through meshing transmission. During the rotation of the lifting gear 52, the lifting rod 4 is moved in the vertical direction through the mutual cooperation of the threads, thereby causing the fixed frame 32 on the top of the support plate 41 to move in the vertical direction. The stability of the fixed frame 32 during movement can be improved by thread cooperation.

[0030] like Figure 1-3 As shown, as one of the preferred embodiments of the present invention, the axis of the driving gear 51 is fixedly connected to a hand crank handle 53 by an axis rod, and the two driving gears 51 are connected by the same axis rod. The staff uses the hand crank handle 53 to make the two driving gears 51 rotate synchronously. The driving gear 51 and the lifting gear 52 both use helical gears. The driving gear 51 rotates in the vertical direction and drives the lifting gear 52 to rotate in the horizontal direction, which is convenient for the staff to rotate the hand crank handle 53. In addition, the first pulley 33 can cancel the drive of the motor. The staff pushes and pulls the fixed frame 32 by hand to move along the horizontal slide rail 31. By manually operating the fixed frame 32 to lower the height of the high-voltage transformer 12, the high-voltage transformer 12 can be repaired or disassembled and replaced without power supply.

[0031] It should be noted that since the low-voltage transformer 11 is small in size and light in weight, the staff can easily disassemble and move the low-voltage transformer 11 manually, so no movable bracket 3 or other structures are set to move the low-voltage transformer 11. In order to improve the convenience of repairing or disassembling and replacing the low-voltage transformer 11, the low-voltage transformer 11 can be fixed on one side of the fixed frame 32 so that the low-voltage transformer 11 and the high-voltage transformer 12 move synchronously. In addition, the support bracket 2 can be replaced with a movable bracket 3, a lifting rod 4, a lifting bracket 5 and other structures, and the low-voltage transformer 11 can be moved independently through another fixed frame 32.

[0032] like Figure 1-3 As shown, as one of the preferred embodiments of the present invention, a limit block 37 is provided at one end of the horizontal slide rail 31 close to the support bracket 2. The limit block 37 is used to limit the distance that the fixed frame 32 moves along the horizontal slide rail 31 to prevent the fixed frame 32 from moving to the side close to the support bracket 2 and hitting the low-voltage transformer 11.

[0033] To sum up, the transformer 1 of the present invention provides current protection for the transformer through the accurate measurement and monitoring of current by the low-voltage transformer 11 and the high-voltage transformer 12, which is beneficial to improving the stability of the power system. The high-voltage transformer 12, which is larger in volume and weight, is fixed by a fixed frame 32. The fixed frame 32 can move along the horizontal slide rail 31 and then move downward along the vertical slide rail 34, thereby lowering the height of the high-voltage transformer 12 and moving it to the side of the transformer 1, making it convenient for staff to repair or disassemble and replace the high-voltage transformer 12, thereby improving the operational efficiency during the inspection or maintenance of the transformer 1.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A dry-type transformer with monitoring and protection functions, comprising a transformer (1), a support bracket (2), and a movable bracket (3), characterized in that: The low-voltage end of the transformer (1) is provided with a low-voltage mutual inductor (11) fixedly connected to the support bracket (2), and the high-voltage end of the transformer (1) is provided with a high-voltage mutual inductor (12). The support bracket (2) is fixedly connected to the movable bracket (3) and is jointly mounted on the outer surface of the transformer (1); The movable bracket (3) includes the following structure: a horizontal slide rail (31) fixedly connected to the support bracket (2) and extending horizontally; a fixed frame (32) is mounted on the top of the horizontal slide rail (31); a plurality of first pulleys (33) sliding along the horizontal slide rail (31) are provided on the side of the fixed frame (32); and a vertical slide rail (34) extending downward and matching the first pulleys (33) is provided at the end of the horizontal slide rail (31); and the high-voltage transformer (12) is fixedly connected to the fixed frame (32).

2. The dry-type transformer with monitoring and protection function according to claim 1, characterized in that: The horizontal slide rail (31) is composed of an upper slide rail (311) and a lower slide rail (312) distributed up and down. The first pulley (33) is composed of an upper pulley (331) sliding along the upper surface of the upper slide rail (311) and a lower pulley (332) sliding along the upper surface of the lower slide rail (312). The lower pulley (332) is provided with a second pulley (35) sliding along the lower surface of the lower slide rail (312) and movably connected to the fixed frame (32) on the side away from the vertical slide rail (34).

3. The dry-type transformer with monitoring and protection function according to claim 1, characterized in that: The vertical slide rail (34) is provided with a first notch (341) matching the first pulley (33) on one side close to the end of the horizontal slide rail (31), and the first notch (341) connects the horizontal slide rail (31) and the vertical slide rail (34) to each other.

4. The dry-type transformer with monitoring and protection function according to claim 2, characterized in that: A third pulley (36) is provided on the side of the fixed frame (32) and slides along the lower surface of the upper slide rail (311). A second notch (342) matching the third pulley (36) is provided on one side of the vertical slide rail (34) near the end of the horizontal slide rail (31).

5. The dry-type transformer with monitoring and protection function according to claim 1, characterized in that: A lifting rod (4) extending upward is provided at the bottom of the vertical slide rail (34), and a support plate (41) is provided at the top of the lifting rod (4). The support plate (41) is located at the intersection of the horizontal slide rail (31) and the vertical slide rail (34).

6. The dry-type transformer with monitoring and protection function according to claim 5, characterized in that: A lifting bracket (5) is provided at the bottom of the vertical slide rail (34), and a driving gear (51) is movably connected to one side of the lifting bracket (5) by a shaft rod. The lifting bracket (5) is movably connected to a lifting gear (52) that meshes with the driving gear (51) by a bearing. A threaded hole is passed through the axis of the lifting gear (52), and a thread matching the threaded hole is provided on the surface of the lifting rod (4) and the threaded hole is passed through the bottom.

7. The dry-type transformer with monitoring and protection function according to claim 6, characterized in that: The axis of the driving gear (51) is fixedly connected to a crank handle (53) via a shaft.

8. The dry-type transformer with monitoring and protection function according to claim 1, characterized in that: A limit block (37) is provided at one end of the horizontal slide rail (31) close to the support bracket (2).

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