All-insulation 145kV power transformer

Abstract

The invention discloses an all-insulation 145kV power transformer, and relates to the technical field of power transformers, the all-insulation 145kV power transformer comprises a bottom plate, the upper end of the bottom plate is fixedly connected with a transformer body through bolts, a transformer main body is fixedly installed above the bottom plate, an insulation mechanism is arranged on the outer side of the transformer main body, and the insulation mechanism is fixedly installed above the bottom plate; the insulating mechanism comprises positioning rods and an insulating plate, the four positioning rods are fixedly mounted on one side of the bottom plate in a central symmetry manner, the insulating plate is movably clamped between the two positioning rods, and the insulating plate is made of boron nitride ceramics. According to the invention, the insulating plate made of the boron nitride ceramic has excellent insulating property, the relative dielectric constant and other electrical properties of the insulating plate enable the insulating plate to effectively block current in an electric field, and the insulating plate is used as a barrier to prevent an electric field line from penetrating out of a weak insulating part of the transformer main body, so that the phenomenon of partial discharge is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of power transformers, in particular to a fully insulated 145kV power transformer. Background Art

[0002] As a vital electrical equipment in the power system, the power transformer plays a key role in changing the size of the AC voltage. Among them, 145kV belongs to a higher voltage level. In the power transmission process, the 145kV voltage level has significant advantages. It can effectively reduce the loss of energy during transmission, realize long-distance and large-capacity power transmission, and meet the power demand of different regions. It can efficiently transmit the electricity generated by the power plant to the distant power consumption area, and provide a stable and reliable power supply for large-scale power consumption scenarios such as cities and industries. At the same time, in large substations, 145kV power transformers, as key equipment, play an important role in voltage conversion and distribution, ensuring the safe and stable operation of the power system and promoting the rational allocation and utilization of power resources.

[0003] For example, a transformer core structure and a power transformer disclosed in Chinese Patent Publication No. CN113690030B include a shell, a bottom plate chamber, a slotted support frame, a transformer component, etc.; the shell is fixedly provided with a bottom plate chamber, the bottom plate chamber is fixedly provided with a slotted support frame, and the transformer component is arranged on the slotted support frame.

[0004] A higher voltage level means that the insulation material inside the transformer needs to have higher insulation performance to withstand the electric field strength brought by the high voltage. However, the insulation of existing power transformers does not meet the insulation requirements of 145kV-level power transformers. When the insulation performance is insufficient, under the action of the electric field, local discharge is prone to occur at the weak insulation points inside the transformer. Under the 145kV high voltage environment, the energy generated by local discharge will cause the insulation material to gradually age and damage, forming a carbonization channel, further reducing the insulation performance, and may eventually lead to insulation breakdown, causing a transformer short circuit failure. Summary of the invention

[0005] The purpose of the present invention is to provide a fully insulated 145kV power transformer to solve the problem raised in the above background technology that when the insulation performance is insufficient, local discharge is likely to occur at the weak insulation inside the transformer under the action of the electric field, resulting in a short circuit failure of the transformer.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a fully insulated kV power transformer, comprising a base plate, the upper end of the base plate is fixedly connected to the body by bolts, the transformer body is fixedly installed above the base plate, an insulating mechanism is arranged on the outer side of the transformer body, the insulating mechanism is fixedly installed above the base plate, the insulating mechanism comprises a positioning rod and an insulating plate, four of the positioning rods are fixedly installed on one side of the base plate in a centrally symmetrical manner, the insulating plate is movably clamped between two positioning rods, the insulating plate is made of boron nitride ceramics, a plurality of No. 1 heat dissipation grooves are evenly opened inside the insulating plate, a plurality of the No. 1 heat dissipation grooves are fixedly connected inside with a heat dissipation net, a plurality of the No. 1 heat dissipation grooves and the heat dissipation net are used to conduct the heat generated when the transformer body is working, a lifting mechanism is symmetrically fixedly installed on the outer side of the body, and the lifting mechanism is used to suspend and transport the power transformer.

[0007] Preferably, a slot is provided on the outer side of the positioning rod, and positioning strips are fixedly connected to both ends of the insulating plate, respectively, and the positioning strips are slidably engaged in the slot.

[0008] Preferably, one end of the positioning rod is threadedly connected to a No. 1 positioning bolt, and one end of the No. 1 positioning bolt is fixedly connected to a positioning plate, and the positioning plate is used to cover the slot entrance of the card slot.

[0009] Preferably, the four corners of the body are fixedly connected with angle irons by bolts, and one side of the angle iron is fixedly connected to one side of the base plate by bolts.

[0010] Preferably, a heat dissipation bin is symmetrically fixedly connected to the outer side of the device body, and a second heat dissipation slot is evenly provided inside the heat dissipation bin, and the second heat dissipation slot is used to transfer the heat of the device body.

[0011] Preferably, the lifting mechanism includes a mounting frame, a mounting rail, and a lifting rope positioner, the two mounting rails are respectively fixedly mounted on both ends of the mounting frame, the lifting rope positioner is arranged above the mounting rails, the two mounting frames are respectively fixedly mounted on both sides of the device body by bolts, and one end of the mounting rail is fixedly connected to a block.

[0012] Preferably, the sling locator includes a mounting base, one end of which is fixedly connected to two mounting side plates, a positioning round rod is fixedly connected between the two mounting side plates, the positioning round rod is used to fix the cable, and the mounting base is slidably clamped on the outer side of the mounting track.

[0013] Preferably, a positioning groove is formed at the other end of the mounting base, and a No. 2 positioning bolt is movably penetrated inside the positioning groove, and one end of the No. 2 positioning bolt is threadedly connected to the inside of the mounting track.

[0014] Preferably, a cable connecting plate is fixedly welded to the upper end of the device body.

[0015] Preferably, the heat dissipation net is made of aluminum alloy, and a plurality of heat dissipation holes are evenly opened inside the heat dissipation net.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the insulating plate made of boron nitride ceramic has excellent insulation performance. Its electrical properties such as relative dielectric constant enable it to effectively block current in an electric field. The insulating plate acts as a barrier to prevent electric field lines from passing through weak insulation of the transformer body, thereby avoiding the occurrence of partial discharge.

[0017] 2. In the present invention, the No. 1 heat sink and the heat sink net transfer the heat to the inside of the device body, and then the No. 2 heat sink on the heat sink on the device body transfers the heat to the external environment, completing the heat dissipation operation, effectively conducting the heat generated when the transformer body is working, and improving the heat dissipation efficiency of the fully insulated kV power transformer.

[0018] 3. In the present invention, when it is necessary to transport and install the fully insulated 1000 kV power transformer, the installation base is slidably clamped to the outside of the installation track, and the No. 2 positioning bolt is rotated to install so that one end of it is threadedly connected to the inside of the installation track, and then the rope is wrapped around the outside of the positioning round rod. With the help of lifting equipment, the fully insulated 1000 kV power transformer is lifted to the designated installation area. After the installation is completed, the lifting rope positioner can be removed to facilitate the transportation of the fully insulated 1000 kV power transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of a fully insulated 145kV power transformer of the present invention; Figure 2 It is a schematic diagram of the connection relationship between the insulation mechanism and the transformer body in a fully insulated 145kV power transformer of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of an insulation mechanism in a fully insulated 145kV power transformer of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of an insulating plate in a fully insulated 145kV power transformer of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of a body of a fully insulated 145kV power transformer of the present invention; Figure 6 It is a three-dimensional structural schematic diagram of a hoisting mechanism in a fully insulated 145kV power transformer of the present invention; Figure 7 The present invention is a schematic diagram of the three-dimensional structure of a suspension rope positioner in a fully insulated 145kV power transformer.

[0020] In the figure: 1. bottom plate; 2. body; 21. angle iron; 22. heat sink; 221. No. 2 heat sink; 3. transformer body; 4. insulation mechanism; 41. positioning rod; 411. slot; 412. No. 1 positioning bolt; 42. insulation plate; 421. No. 1 heat sink; 422. heat sink net; 423. heat dissipation hole; 424. positioning clip; 5. lifting mechanism; 5. lifting mechanism; 51. mounting frame; 52. mounting track; 521. block; 53. lifting rope positioner; 531. mounting base; 532. mounting side panel; 533. positioning round rod; 534. positioning slot; 535. No. 2 positioning bolt; 6. cable connecting plate. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1: Reference Figure 1 - Figure 5 As shown: a fully insulated 145kV power transformer, including a base plate 1, the upper end of the base plate 1 is fixedly connected to a body 2 by bolts, a transformer body 3 is fixedly installed above the base plate 1, an insulating mechanism 4 is arranged on the outer side of the transformer body 3, the insulating mechanism 4 is fixedly installed above the base plate 1, the insulating mechanism 4 includes a positioning rod 41 and an insulating plate 42, four positioning rods 41 are fixedly installed on one side of the base plate 1 in a centrally symmetrical manner, the insulating plate 42 is movably connected between two positioning rods 41, the insulating plate 42 is made of boron nitride ceramics, a plurality of No. 1 heat dissipation grooves 421 are evenly opened inside the insulating plate 42, a plurality of No. 1 heat dissipation grooves 421 are fixedly connected to the inside of the plurality of No. 1 heat dissipation grooves 421, and a plurality of No. 1 heat dissipation grooves 421 and heat dissipation nets 422 are fixedly connected. The net 422 is used to conduct the heat generated by the transformer body 3 when it is working. The outer side of the body 2 is symmetrically fixed with a lifting mechanism 5, which is used to suspend and transport the power transformer. A slot 411 is provided on the outer side of the positioning rod 41, and both ends of the insulating plate 42 are respectively fixedly connected with positioning strips 424, which are slidably connected to the inside of the slot 411. One end of the positioning rod 41 is threadedly connected with a No. 1 positioning bolt 412, and one end of the No. 1 positioning bolt 412 is fixedly connected with a positioning plate, which is used to block the entrance of the slot 411. The four corners of the body 2 are fixedly connected with angle irons 21 by bolts, and one side of the angle iron 21 is fixedly connected to one side of the base plate 1 by bolts. The upper end of the body 2 is fixedly welded with a cable connecting plate 6.

[0023] In this embodiment, an insulating mechanism 4 is provided on the outside of the transformer body 3. When local discharge occurs at a weak insulation point inside the transformer body 3, the insulating plate 42 made of boron nitride ceramic has excellent insulation performance, and its electrical properties such as relative dielectric constant enable it to effectively block current in an electric field, wherein the insulating plate 42 acts as a barrier to prevent the electric field lines from passing through the weak insulation point of the transformer body 3, thereby avoiding the occurrence of local discharge. In addition, boron nitride ceramic has good chemical stability and will not chemically react with common substances in the transformer operating environment to cause a decrease in insulation performance, which ensures that the insulating plate 42 always maintains good insulation performance during long-term operation and continuously provides stable insulation protection for the transformer body 3. When assembling the insulating mechanism 4, the positioning card strip 424 on the insulating plate 42 is clamped to the inside of the card slot 411 on the positioning rod 41, and the No. 1 positioning bolt 412 is rotated and installed so that the positioning disk on the No. 1 positioning bolt 412 blocks the slot entrance of the card slot 411, and the positioning card strip 424 is stably clamped to the inside of the card slot 411 to complete the assembly operation of the insulating mechanism 4.

[0024] Embodiment 2: Figure 1 - Figure 5 As shown, a fully insulated 145kV power transformer includes a base plate 1, the upper end of the base plate 1 is fixedly connected to a body 2 by bolts, a transformer body 3 is fixedly installed above the base plate 1, an insulating mechanism 4 is arranged on the outer side of the transformer body 3, the insulating mechanism 4 is fixedly installed above the base plate 1, the insulating mechanism 4 includes a positioning rod 41 and an insulating plate 42, four positioning rods 41 are fixedly installed on one side of the base plate 1 in a centrally symmetrical manner, the insulating plate 42 is movably connected between two positioning rods 41, the insulating plate 42 is made of boron nitride ceramics, a plurality of No. 1 heat dissipation grooves 421 are evenly opened inside the insulating plate 42, a plurality of No. 1 heat dissipation grooves 421 are fixedly connected inside with heat dissipation nets 422, a plurality of No. 1 heat dissipation grooves 421 and the heat dissipation nets 422 are used to conduct the heat generated when the transformer body 3 is working, and a hoist is symmetrically fixedly installed on the outer side of the body 2. Structure 5, the lifting mechanism 5 is used for suspending and carrying the power transformer, a slot 411 is provided on the outer side of the positioning rod 41, and positioning strips 424 are fixedly connected at both ends of the insulating plate 42, and the positioning strips 424 are slidably connected to the inside of the slot 411, one end of the positioning rod 41 is threadedly connected to a No. 1 positioning bolt 412, and one end of the No. 1 positioning bolt 412 is fixedly connected to a positioning plate, and the positioning plate is used to block the entrance of the slot 411, and the four corners of the body 2 are fixedly connected to angle irons 21 by bolts, and one side of the angle iron 21 is fixedly connected to one side of the bottom plate 1 by bolts, and the outer side of the body 2 is symmetrically fixedly connected to the heat dissipation bin 22, and the inside of the heat dissipation bin 22 is evenly provided with No. 2 heat dissipation slots 221, which are used to transfer the heat of the body 2, and the heat dissipation net 422 is made of aluminum alloy, and the inside of the heat dissipation net 422 is evenly provided with a plurality of heat dissipation holes 423.

[0025] In this embodiment, by evenly opening a plurality of No. 1 heat dissipation grooves 421 inside the insulating plate 42, and installing a heat dissipation net 422 inside the No. 1 heat dissipation groove 421, the No. 1 heat dissipation groove 421 and the heat dissipation net 422 can effectively conduct the heat generated when the transformer body 3 is working, thereby improving the heat dissipation efficiency of the fully insulated 145kV power transformer, so that the fully insulated 145kV power transformer will not be overheated or overloaded when working for a long time; in addition, by symmetrically fixing the heat dissipation bin 22 on the outer side of the body 2, the No. 1 heat dissipation groove 421 and The heat dissipation net 422 transfers the heat to the inside of the device body 2, and then the No. 2 heat dissipation slot 221 on the heat dissipation bin 22 on the device body 2 transfers the heat to the external environment to complete the heat dissipation operation; wherein the heat dissipation net 422 is made of aluminum alloy, which can effectively conduct the heat generated by the transformer, and the mechanical strength of the heat dissipation net 422 made of aluminum alloy is significantly improved, which makes the heat dissipation net 422 not easy to deform when subjected to certain external forces such as wind pressure, vibration, etc., and the aluminum alloy material improves the corrosion resistance of the heat dissipation net 422 and extends the service life of the heat dissipation net 422.

[0026] Embodiment 3: According to Figure 1 - Figure 7As shown, a fully insulated 145kV power transformer comprises a base plate 1, an upper end of the base plate 1 is fixedly connected with a body 2 by bolts, a transformer body 3 is fixedly installed above the base plate 1, an insulating mechanism 4 is arranged on the outer side of the transformer body 3, the insulating mechanism 4 is fixedly installed above the base plate 1, the insulating mechanism 4 comprises a positioning rod 41 and an insulating plate 42, four positioning rods 41 are fixedly installed on one side of the base plate 1 in a centrally symmetrical manner, the insulating plate 42 is movably clamped between two positioning rods 41, the insulating plate 42 is made of boron nitride ceramic, a plurality of No. 1 heat dissipation grooves 421 are evenly opened inside the insulating plate 42, a plurality of No. 1 heat dissipation grooves 421 are fixedly connected with heat dissipation nets 422 inside, the plurality of No. 1 heat dissipation grooves 421 and the heat dissipation nets 422 are used to conduct the heat generated when the transformer body 3 is working, and a lifting mechanism 5 is symmetrically fixedly installed on the outer side of the body 2, and the lifting mechanism 5 is used to suspend and transport the power transformer. The lifting mechanism 5 includes a mounting frame 51, a mounting rail 52, and a lifting rope positioner 53. The two mounting rails 52 are respectively fixedly mounted on the two ends of the mounting frame 51, and the lifting rope positioner 53 is arranged above the mounting rail 52. The two mounting frames 51 are respectively fixedly mounted on the two sides of the device body 2 by bolts. One end of the mounting rail 52 is fixedly connected with a block 521. The lifting rope positioner 53 includes a mounting base 531. One end of the mounting base 531 is respectively fixedly connected with two mounting side plates 532. A positioning round rod 533 is fixedly connected between the two mounting side plates 532. The positioning round rod 533 is used to fix the cable. The mounting base 531 is slidably clamped on the outer side of the mounting rail 52. A positioning groove 534 is opened at the other end of the mounting base 531. A No. 2 positioning bolt 535 is movably penetrated inside the positioning groove 534. One end of the No. 2 positioning bolt 535 is threadedly connected to the inside of the mounting rail 52.

[0027] In this embodiment, when it is necessary to transport and install the fully insulated 145kV power transformer, the installation base 531 is slidably clamped to the outside of the installation rail 52, and the No. 2 positioning bolt 535 is rotated to install so that one end of it is threadedly connected to the inside of the installation rail 52, and then the rope is wrapped around the outside of the positioning round rod 533. With the help of lifting equipment, the fully insulated 145kV power transformer is lifted to the designated installation area. After the installation is completed, the lifting rope positioner 53 can be removed to facilitate reuse in subsequent transportation operations.

[0028] The use method and working principle of the device are as follows: when local discharge occurs at the weak insulation part inside the transformer body 3, the insulating plate 42 can effectively block the current in the electric field, wherein the insulating plate 42 acts as a barrier to prevent the electric field lines from passing through the weak insulation part of the transformer body 3; when assembling the insulating mechanism 4, the positioning card strip 424 on the insulating plate 42 is clamped into the inside of the card slot 411 on the positioning rod 41, and the No. 1 positioning bolt 412 is rotated and installed so that the positioning disk on the No. 1 positioning bolt 412 blocks the entrance of the card slot 411, and the positioning card strip 424 is stably clamped into the inside of the card slot 411, and the assembly operation of the insulating mechanism 4 is completed; the fully insulated 145kV power transformer When the transformer is dissipating heat, the No. 1 heat sink 421 and the heat sink net 422 transfer the heat to the inside of the body 2, and then the No. 2 heat sink 221 on the heat sink 22 on the body 2 transfers the heat to the external environment to complete the heat dissipation operation. When the fully insulated 145kV power transformer needs to be transported and installed, the installation base 531 is slidably clamped to the outside of the installation track 52, and the No. 2 positioning bolt 535 is rotated to install so that one end of it is threadedly connected to the inside of the installation track 52, and then the rope is wrapped around the outside of the positioning round rod 533. With the help of lifting equipment, the fully insulated 145kV power transformer is lifted to the designated installation area. After the installation is completed, the lifting rope positioner 53 can be removed.

[0029] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fully insulated 145 kV power transformer, comprising a base plate (1), characterized in that: The upper end of the base plate (1) is fixedly connected to the body (2) by bolts, a transformer body (3) is fixedly mounted above the base plate (1), an insulating mechanism (4) is arranged on the outer side of the transformer body (3), the insulating mechanism (4) is fixedly mounted above the base plate (1), the insulating mechanism (4) comprises positioning rods (41) and insulating plates (42), four positioning rods (41) are fixedly mounted on one side of the base plate (1) in a centrally symmetrical manner, and the insulating plates (42) are movably clamped on the two positioning rods (41). 1), the insulating plate (42) is made of boron nitride ceramics, a plurality of No. 1 heat dissipation grooves (421) are evenly arranged inside the insulating plate (42), a plurality of No. 1 heat dissipation grooves (421) are fixedly connected inside with heat dissipation nets (422), the plurality of No. 1 heat dissipation grooves (421) and the heat dissipation nets (422) are used to conduct heat generated when the transformer body (3) is working, and a lifting mechanism (5) is symmetrically fixedly installed on the outer side of the body (2), and the lifting mechanism (5) is used to suspend and transport the power transformer.

2. A fully insulated 145kV power transformer according to claim 1, characterized in that: A clamping groove (411) is provided on the outer side of the positioning rod (41), and positioning clamping strips (424) are fixedly connected to both ends of the insulating plate (42), respectively, and the positioning clamping strips (424) are slidably clamped inside the clamping groove (411).

3. A fully insulated 145kV power transformer according to claim 2, characterized in that: One end of the positioning rod (41) is threadedly connected to a No. 1 positioning bolt (412), and one end of the No. 1 positioning bolt (412) is fixedly connected to a positioning plate, and the positioning plate is used to cover the slot entrance of the card slot (411).

4. A fully insulated 145kV power transformer according to claim 1, characterized in that: The four corners of the body (2) are fixedly connected to angle irons (21) by means of bolts, and one side of the angle iron (21) is fixedly connected to one side of the bottom plate (1) by means of bolts.

5. A fully insulated 145kV power transformer according to claim 4, characterized in that: A heat dissipation bin (22) is symmetrically fixedly connected to the outer side of the device body (2), and second heat dissipation slots (221) are evenly arranged inside the heat dissipation bin (22), and the second heat dissipation slots (221) are used to transfer heat from the device body (2).

6. A fully insulated 145kV power transformer according to claim 1, characterized in that: The lifting mechanism (5) comprises a mounting frame (51), a mounting rail (52), and a lifting rope positioner (53); the two mounting rails (52) are respectively fixedly mounted on two ends of the mounting frame (51); the lifting rope positioner (53) is arranged above the mounting rails (52); the two mounting frames (51) are respectively fixedly mounted on two sides of the device body (2) by bolts; and a stopper (521) is fixedly connected to one end of the mounting rail (52).

7. A fully insulated 145kV power transformer according to claim 6, characterized in that: The suspension rope positioner (53) comprises a mounting base (531), one end of which is fixedly connected to two mounting side plates (532), a positioning round rod (533) is fixedly connected between the two mounting side plates (532), the positioning round rod (533) is used to fix the cable, and the mounting base (531) is slidably clamped on the outer side of the mounting track (52).

8. A fully insulated 145kV power transformer according to claim 7, characterized in that: The other end of the mounting base (531) is provided with a positioning groove (534), a second positioning bolt (535) movably penetrates the interior of the positioning groove (534), and one end of the second positioning bolt (535) is threadedly connected to the interior of the mounting track (52).

9. A fully insulated 145kV power transformer according to claim 1, characterized in that: A cable connection plate (6) is fixedly welded to the upper end of the device body (2).

10. A fully insulated 145kV power transformer according to claim 1, characterized in that: The heat dissipation net (422) is made of aluminum alloy, and a plurality of heat dissipation holes (423) are evenly arranged inside the heat dissipation net (422).

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