transformer

Abstract

The application discloses a transformer. The transformer comprises an oil tank, a first body and a second body arranged in the oil tank, a high-voltage bushing and a low-voltage bushing arranged on the oil tank; the first body comprises a first high-voltage winding, and a neutral point of the first high-voltage winding is grounded; the second body comprises a second high-voltage winding and a second low-voltage winding which are magnetically coupled, and single-phase line terminals of the second high-voltage winding are connected with same-phase line terminals of the first high-voltage winding respectively; the same-phase line terminals of the first high-voltage winding and the second high-voltage winding are led out of the oil tank through the same high-voltage bushing, and the second low-voltage winding is led out of the oil tank through the low-voltage bushing. The arrangement of the oil tank can be reduced, the volume of the transformer can be reduced, and the occupied space of the transformer is reduced. When the transformer has the first body and the second body, the use of a group of high-voltage bushings can be reduced, so that the production cost of the transformer is saved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of power systems, and more particularly to a transformer. Background Technology

[0002] With the rapid development of large-scale substations both domestically and internationally, grounding transformers play a crucial role in power grid systems. Their function is to artificially provide a neutral point for the power system when a D-type connection neutral point cannot be established. When a single-phase-to-ground short circuit occurs in the power system, the ground current flowing through the fault point can smoothly return to the line via the grounding transformer coil, providing sufficient fault current information to the automatic protection devices for grounding protection. Grounding transformers often also serve as auxiliary transformers, providing auxiliary power to the power system. In this case, the grounding transformer's structure becomes more complex and its size larger, increasing production and maintenance costs as well as its space requirements. Summary of the Invention

[0003] This invention provides a transformer that simplifies the transformer's structure and reduces its size, thereby lowering the transformer's cost and space requirements.

[0004] In a first aspect, embodiments of the present invention provide a transformer, including an oil tank, a first transformer body and a second transformer body disposed within the oil tank, and a high-voltage bushing and a low-voltage bushing disposed on the oil tank;

[0005] The first transformer body includes a first high-voltage winding, the neutral point of which is grounded; the second transformer body includes a magnetically coupled second high-voltage winding and a second low-voltage winding, the single-phase line terminals of the second high-voltage winding are respectively connected to the same-phase line terminals of the first high-voltage winding; the same-phase line terminals of the first high-voltage winding and the second high-voltage winding are led out to the outside of the oil tank through the same high-voltage bushing, and the second low-voltage winding is led out to the outside of the oil tank through the low-voltage bushing.

[0006] Optionally, the first high-voltage winding is connected in a Z-shape, and the second high-voltage winding is connected in a D-shape.

[0007] Optionally, the second low-voltage winding is connected in an yn configuration.

[0008] Optionally, the second high-voltage winding includes a high-voltage coil and a voltage regulating switch; the first end of the single-phase high-voltage coil serves as the single-phase winding connection end of the second high-voltage winding, and the second end of the single-phase high-voltage coil serves as the single-phase line terminal of the second high-voltage winding; the high-voltage coil also includes multiple taps, the taps are connected to the stationary contacts of the voltage regulating switch, and the moving contacts of the voltage regulating switch are used to select any two stationary contacts of the voltage regulating switch.

[0009] Optionally, the oil tank includes a first tank bottom, a second tank bottom, and a first tank side plate. The first tank bottom and the second tank bottom are spaced apart. One end of the first tank side plate is connected to the first tank bottom, and the other end of the first tank side plate is connected to the second tank bottom. The first device body is fixed to the first tank bottom, and the second device body is fixed to the second tank bottom.

[0010] Optionally, one end of the first tank side plate is connected to the middle area of ​​the first tank bottom, and the outer side of the second tank bottom, the outer side of the first tank side plate, and the first tank bottom form a recessed area. An oil collecting pipe is provided in the recessed area, one end of the oil collecting pipe is connected to the inside of the oil tank, and a partition plate is provided between two adjacent oil collecting pipes in the recessed area. The partition plate is connected to the second tank bottom, the first tank side plate, and the first tank bottom, respectively.

[0011] Optionally, the oil tank has a first radiator on the side with the recessed area, and a second radiator on the side of the oil tank adjacent to the first radiator. The first radiator is connected to a first connecting pipe, which is connected to the oil collection pipe in a one-to-one correspondence. The second radiator is connected to a second connecting pipe, which is connected to the oil collection pipe. The oil collection pipe, which is connected to both the second connecting pipe and the first connecting pipe, is a square pipe.

[0012] Optionally, a first reinforcing rib is provided between the oil collecting pipe and the first tank side plate;

[0013] And / or, a second reinforcing rib is provided between the first connecting pipe and the oil collecting pipe;

[0014] And / or, a third reinforcing rib is provided between the second connecting pipe and the oil collecting pipe;

[0015] And / or, a fourth reinforcing rib is connected between the second connecting pipe and the bottom of the first box.

[0016] Optionally, the transformer further includes a first upper clamp, a second upper clamp, a first fixing member, and a second fixing member. The first upper clamp abuts against the end of the first transformer body opposite to the bottom of the first tank, and the second upper clamp abuts against the end of the second transformer body opposite to the bottom of the second tank. The first upper clamp and the second upper clamp extend in the same direction and have the same length. One end of the first upper clamp and one end of the second upper clamp are connected to the same first fixing member, and the other end of the first upper clamp and the other end of the second upper clamp are connected to the same first fixing member. The first fixing member is connected to the inner wall of the oil tank through the second fixing member.

[0017] Optionally, the end of the first device body away from the bottom of the first box is higher than the end of the second device body away from the bottom of the second box, the side of the second upper clamp away from the second device body is flush with the side of the first upper clamp away from the first device body, and the side of the second upper clamp away from the second device body and the side of the first upper clamp away from the first device body are respectively connected to the first fixing member.

[0018] Optionally, a support base is provided on the outer side of the first box bottom, and a roller is provided on the support base, the roller being configured to support on the support surface.

[0019] Secondly, embodiments of the present invention provide a transformer, including an oil tank, a first transformer body, and a second transformer body. The oil tank includes a first tank bottom, a second tank bottom, and a first tank side plate. The first tank bottom and the second tank bottom are spaced apart. One end of the first tank side plate is connected to the middle area of ​​the first tank bottom, and the other end of the first tank side plate is connected to one end of the second tank bottom. The first transformer body is fixed to the first tank bottom, and the second transformer body is fixed to the second tank bottom. The outer side of the second tank bottom, the outer side of the first tank side plate, and the first tank bottom form a recessed area. A partition plate is provided in the recessed area, and the partition plate is connected to the second tank bottom, the first tank side plate, and the first tank bottom, respectively.

[0020] Optionally, the recessed area is provided with an oil collecting pipe, one end of which is connected to the inside of the oil tank, and a partition plate is provided between two adjacent oil collecting pipes.

[0021] Optionally, the oil tank has a first radiator on the side with the recessed area, and a second radiator on the side of the oil tank adjacent to the first radiator. The first radiator is connected to a first connecting pipe, which is connected to the oil collection pipe in a one-to-one correspondence. The second radiator is connected to a second connecting pipe, which is connected to the oil collection pipe. The oil collection pipe, which is connected to both the second connecting pipe and the first connecting pipe, is a square pipe.

[0022] Optionally, a first reinforcing rib is provided between the oil collecting pipe and the first tank side plate;

[0023] And / or, a second reinforcing rib is provided between the first connecting pipe and the oil collecting pipe;

[0024] And / or, a third reinforcing rib is provided between the second connecting pipe and the oil collecting pipe;

[0025] And / or, a fourth reinforcing rib is connected between the second connecting pipe and the bottom of the first box.

[0026] Optionally, the transformer further includes a first upper clamp, a second upper clamp, a first fixing member, and a second fixing member. The first upper clamp abuts against the end of the first transformer body opposite to the bottom of the first tank, and the second upper clamp abuts against the end of the second transformer body opposite to the bottom of the second tank. The first upper clamp and the second upper clamp extend in the same direction and have the same length. One end of the first upper clamp and one end of the second upper clamp are connected to the same first fixing member, and the other end of the first upper clamp and the other end of the second upper clamp are connected to the same first fixing member. The first fixing member is connected to the inner wall of the oil tank through the second fixing member.

[0027] Optionally, the end of the first device body away from the bottom of the first box is higher than the end of the second device body away from the bottom of the second box, the side of the second upper clamp away from the second device body is flush with the side of the first upper clamp away from the first device body, and the side of the second upper clamp away from the second device body and the side of the first upper clamp away from the first device body are respectively connected to the first fixing member.

[0028] Optionally, a support base is provided on the outer side of the first box bottom, and a roller is provided on the support base, the roller being configured to support on the support surface.

[0029] Optionally, the transformer further includes a high-voltage bushing and a low-voltage bushing disposed on the oil tank; the first transformer body includes a first high-voltage winding, the neutral point of the first high-voltage winding being grounded; the second transformer body includes a magnetically coupled second high-voltage winding and a second low-voltage winding, the single-phase line terminals of the second high-voltage winding being respectively connected to the same-phase line terminals of the first high-voltage winding; the same-phase line terminals of the first high-voltage winding and the second high-voltage winding are led out to the outside of the oil tank through the same high-voltage bushing, and the second low-voltage winding is led out to the outside of the oil tank through a low-voltage bushing.

[0030] The technical solution of this invention, by setting both the first and second transformer bodies within the same oil tank, reduces the need for an oil tank while allowing the transformer to simultaneously perform two transformer functions. This also reduces the transformer's size and space requirements. Furthermore, the single-phase terminals of the second high-voltage winding are connected to the same-phase terminals of the first high-voltage winding, and the same-phase windings of both windings are led out of the oil tank through the same high-voltage bushing, allowing them to share the same set of high-voltage bushings. When the transformer has both a first and a second transformer body, the use of one set of high-voltage bushings can be reduced, thereby saving on transformer production costs.

[0031] In the technical solution of this invention, the first and second transformer bodies are at different heights. By placing the first and second transformer bodies on tank bottoms of different heights, the height difference between the tops of the first and second transformer bodies can be reduced. When connecting the first and second transformers, the length of the wiring between them can be reduced, improving the reliability and simplicity of the wiring between the first and second transformers. The structure of the first and second tank bottoms creates a concave structure for the tank, which reduces the amount of transformer oil used in the second transformer and avoids a large waste of transformer oil on the second transformer side. The first tank bottom is placed on the outside of the tank, forming a stable support structure at the bottom of the tank. The partition plate increases the support strength of the first tank bottom, improves the structural strength of the tank, reduces the probability of tank deformation during transportation and transfer, and improves the stability of the second transformer. Attached Figure Description

[0032] Figure 1 A schematic diagram of the principle structure of a transformer provided in an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the high-voltage side structure of a transformer provided in an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the low-voltage side of a transformer provided in an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the left-side structure of a transformer provided in an embodiment of the present invention;

[0036] Figure 5 A first axonometric view of a transformer tank structure provided in an embodiment of the present invention;

[0037] Figure 6 A second isometric view of a transformer tank structure provided in an embodiment of the present invention;

[0038] Figure 7 This is a top view of a transformer provided in an embodiment of the present invention;

[0039] Figure 8 This is a partial top view of another transformer provided in an embodiment of the present invention.

[0040] In the picture:

[0041] 100. First body of the vessel; 200. Second body of the vessel;

[0042] 10. High-voltage bushing; 30. First high-voltage winding; 40. Second high-voltage winding; 41. Single-phase high-voltage coil; 50. Second low-voltage winding; 501. Low-voltage bushing;

[0043] 20. Fuel tank; 201. First tank bottom; 202. Second tank bottom; 203. First tank side panel; 204. Recessed area; 205. Tank top panel; 206. Second tank side panel; 207. Third tank side panel; 208. Fourth tank side panel; 60. Divider plate; 70. First radiator; 80. Second radiator; 90. Oil collection pipe; 110. First connecting pipe; 120. Second connecting pipe; 130. First reinforcing rib; 140. Second reinforcing rib; 150. Third reinforcing rib; 160. Fourth reinforcing rib; 170. First upper clamp; 180. Second upper clamp; 190. First fixing component; 1100. Second fixing component; 1200. Support base; 1300. Roller; 1400. Third radiator; 1500. Third connecting pipe; 101. Oil storage tank;

[0044] 2. Fourth tap; 3. Third tap; 4. Fifth tap; 5. Second tap; 6. Sixth tap; 7. First tap. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0046] Figure 1 This is a schematic diagram of the principle structure of a transformer provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the high-voltage side structure of a transformer according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the low-voltage side structure of a transformer provided in an embodiment of the present invention. Figures 1 to 3 As shown, the transformer includes an oil tank 20, a first transformer body and a second transformer body disposed within the oil tank 20, and a high-voltage bushing 10 and a low-voltage bushing 501 disposed on the oil tank 20. The first transformer body includes a first high-voltage winding 30, the neutral point N of which is grounded. The second transformer body includes a magnetically coupled second high-voltage winding 40 and a second low-voltage winding 50. The single-phase line terminals of the second high-voltage winding 40 are respectively connected to the same-phase line terminals of the first high-voltage winding 30. The same-phase line terminals of the first high-voltage winding 30 and the second high-voltage winding 40 are led out to the outside of the oil tank 20 through the same high-voltage bushing 10, and the second low-voltage winding 50 is led out to the outside of the oil tank 20 through the low-voltage bushing 501.

[0047] Specifically, the first and second transformer bodies can be three-phase transformers. The first high-voltage winding 30 has a neutral point N, which is grounded, allowing the first transformer body to function as a grounding transformer, providing a grounding point for the power system. In this case, the first transformer body can operate under no-load conditions. The second transformer body can be an auxiliary transformer, where the line terminals of the second low-voltage winding 50 can be connected to the electrical equipment in the power system to provide auxiliary power. When a short-circuit fault occurs in the power system where the transformer is located, the short-circuit current in the first transformer body is relatively large. Therefore, the rated apparent power of the second transformer body can be set to be relatively small. By providing auxiliary power to the power system through the second low-voltage winding 50 of the second transformer body, the short-circuit current in the first transformer body can be prevented from affecting the electrical equipment connected to the second low-voltage winding 50, ensuring the reliability of the transformer's auxiliary power supply function. In this case, the first transformer body does not need to have a low-voltage winding as an auxiliary power supply. When the low-voltage winding is led out of the oil tank 20 through the low-voltage bushing 501, the low-voltage bushing 501 is used to insulate and fix the second low-voltage winding 50 to the oil tank 20. At this time, only one set of low-voltage bushings 501 is needed to lead the second low-voltage winding 50 out of the oil tank 20, avoiding the need to increase the number of low-voltage bushings 501. Both the first high-voltage winding 30 and the second high-voltage winding 40 include three-phase windings, and therefore both the first high-voltage winding 30 and the second high-voltage winding 40 include three single-phase line terminals, namely the first phase line terminal, the second phase line terminal, and the third phase line terminal. At this time, the first phase line terminal A3 of the first high-voltage winding 30 is connected to the first phase line terminal U1 of the second high-voltage winding 40, the second phase line terminal B3 of the first high-voltage winding 30 is connected to the second phase line terminal V1 of the second high-voltage winding 40, and the third phase line terminal C3 of the first high-voltage winding 30 is connected to the third phase line terminal W1 of the second high-voltage winding 40. This ensures that each phase winding of the first high-voltage winding 30 and each phase winding of the second high-voltage winding 40 are connected in parallel, so that the voltage flowing through the first high-voltage winding 30 and the second high-voltage winding 40 is the rated voltage. When the second high-voltage winding 40 includes a tap changer, multi-level voltage regulation can be achieved based on the rated voltage. At this time, the same-phase windings of the first high-voltage winding 30 and the second high-voltage winding 40 are short-circuited and used as the output terminals of the single-phase windings on the high-voltage side. For example, as shown... Figure 1 As shown, the line terminal A3 of the first phase winding in the first high-voltage winding 30 is connected to the line terminal U1 of the first phase winding in the second high-voltage winding 40 to serve as the line terminal A of the first phase winding on the high-voltage side. The line terminal B3 of the second phase winding in the first high-voltage winding 30 is connected to the line terminal V1 of the second phase winding in the second high-voltage winding 40 to serve as the line terminal B of the second phase winding on the high-voltage side. The line terminal C3 of the third phase winding in the first high-voltage winding 30 is connected to the line terminal W1 of the third phase winding in the second high-voltage winding 40 to serve as the line terminal C of the third phase winding on the high-voltage side.

[0048] The high-voltage bushing 10 may include three. The line terminals of the single-phase high-voltage winding are led out of the oil tank 20 through one high-voltage bushing 10, which is used to insulate and fix the first high-voltage winding 30 and the second high-voltage winding 40 to the oil tank 20. By setting the same-phase line terminals of the first high-voltage winding 30 and the second high-voltage winding 40 to be led out of the oil tank 20 through the same high-voltage bushing 10, the first high-voltage winding 30 and the second high-voltage winding 40 can share the same set of high-voltage bushings 10. When the transformer has a first body and a second body, the use of one set of high-voltage bushings 10 can be reduced, thereby saving the production cost of the transformer.

[0049] Simultaneously, the first and second transformer bodies are housed within the same oil tank 20. This reduces the need for an oil tank 20, thus decreasing the transformer's size and space requirements, even though the transformer simultaneously performs two transformer functions. For example, when the second transformer body is an auxiliary transformer, it can be a grounding transformer and also function as an auxiliary transformer.

[0050] The technical solution of this embodiment, by setting both the first and second transformer bodies within the same oil tank, reduces the need for an oil tank while allowing the transformer to simultaneously perform two transformer functions. This also reduces the transformer's size and space requirements. Furthermore, the single-phase terminals of the second high-voltage winding are connected to the same-phase terminals of the first high-voltage winding, and the same-phase terminals of both windings are led out of the oil tank through the same high-voltage bushing, allowing them to share the same set of high-voltage bushings. When the transformer has both a first and a second transformer body, the use of one set of high-voltage bushings can be reduced, thereby saving on transformer production costs.

[0051] Continue to refer to Figure 1 The first high-voltage winding 30 is connected in a Z-shape, and the second high-voltage winding 40 is connected in a D-shape.

[0052] Specifically, such as Figure 1 As shown, the wiring configuration of the first high-voltage winding 30 is a zigzag type. Specifically, as... Figure 1As shown, the first high-voltage winding 30 includes a three-phase winding. The first phase winding includes a first coil A1X1 and a second coil A2X2. The second phase winding includes a third coil B1Y1 and a fourth coil B2Y2. The third phase winding includes a fifth coil C1Z1 and a sixth coil C2Z2. Each coil has two ends, namely the first end and the second end of the coil. The first end A1 of the first coil A1X1 serves as the line terminal A3 of the first phase winding. The second end X1 of the first coil A1X1 is connected to the second end Z2 of the sixth coil C2Z2. After the first end A2 of the second coil A2X2, the first end B2 of the fourth coil B2Y2, and the first end C2 of the sixth coil C2Z2 are connected, they are connected to the neutral point N and led out to the outside of the oil tank 20 through the high-voltage bushing 10 corresponding to the neutral point N. The first terminal C1 of the fifth coil C1Z1 serves as the line terminal C3 of the third phase winding. The second terminal Z1 of the fifth coil C1Z1 is connected to the second terminal Y2 of the fourth coil B2Y2. The first terminal B1 of the third coil B1Y1 serves as the line terminal B3 of the second phase winding. The second terminal Y1 of the third coil B1Y1 is connected to the second terminal X2 of the second coil A2X2. When a fault occurs in the power system, the fault current is balanced between the two series windings, allowing the fault current to pass smoothly through the first transformer body to ground. The second high-voltage winding 40 is connected in a D-shape, i.e., a delta connection. In this case, the second high-voltage winding 40 does not form a zero-sequence path, meaning it does not have zero-sequence impedance. The zero-sequence impedance of the transformer is the same as that of the first high-voltage winding 30. When the zero-sequence impedance of the first transformer body meets the transformer's requirements, the transformer's zero-sequence impedance also meets the requirements. Furthermore, the Z-shaped connection of the first high-voltage winding 30 has a large magnetic reluctance. When the first transformer body is in an unloaded state, its no-load current is very small and will not affect the impedance voltage of the second transformer body. Therefore, the impedance voltage of the transformer is the impedance voltage of the second transformer body. When the impedance voltage of the second transformer body meets the requirements of the transformer, the impedance voltage of the transformer will also meet the requirements of the transformer. Thus, the zero-sequence impedance parameter and impedance voltage parameter of the transformer can meet the performance requirements of the transformer.

[0053] Continue to refer to Figure 1 and Figure 3 The second low-voltage winding 50 is connected in an yn configuration.

[0054] Specifically, the second low-voltage winding 50 is star-connected and has a neutral point n. In this case, the three-phase output terminals (phase a, phase b, and phase c) of the second low-voltage winding 50 can be connected to the load to supply power, thus realizing the function of the second transformer as an auxiliary transformer. For example, the three-phase output terminals (phase a, phase b, and phase c) of the second low-voltage winding 50 can be connected to a single-phase load individually, or simultaneously to a three-phase load.

[0055] Continue to refer to Figure 2 and Figure 3 The transformer also includes an oil conservator 101 for storing oil and supplying oil to the oil tank 20.

[0056] Continue to refer to Figure 1 The second high-voltage winding 40 includes a high-voltage coil and a voltage regulating switch. Figure 1 (not shown in the image); the first end of the single-phase high-voltage coil 41 serves as the single-phase winding connection end of the second high-voltage winding 40, and the second end of the single-phase high-voltage coil 41 serves as the single-phase line terminal of the second high-voltage winding 40; the high-voltage coil also includes multiple taps, which are connected to the stationary contacts of the voltage regulating switch, and the moving contacts of the voltage regulating switch are used to select any two stationary contacts of the voltage regulating switch.

[0057] Specifically, the high-voltage coil can be a three-phase coil, and the voltage regulating switch can be a three-phase switch. The first end c1 of the single-phase high-voltage coil 41 in the third phase winding of the second high-voltage winding 40 is connected to the second end a2 of the single-phase high-voltage coil 41 in the first phase winding of the second high-voltage winding 40. The second end c2 of the single-phase high-voltage coil 41 in the third phase winding of the second high-voltage winding 40 is connected to the first end b1 of the single-phase high-voltage coil 41 in the second phase winding, and serves as the line terminal W1 of the third phase winding of the second high-voltage winding 40. The second end b2 of the single-phase high-voltage coil 41 in the second phase winding of the second high-voltage winding 40 is connected to the first end a1 of the single-phase high-voltage coil 41 in the first phase winding of the second high-voltage winding 40, and serves as the line terminal V1 of the second phase winding of the second high-voltage winding 40. The second end a2 of the single-phase high-voltage coil 41 in the first phase winding of the second high-voltage winding 40 serves as the line terminal U1 of the first phase winding of the second high-voltage winding 40, forming a D-shaped connection. The single-phase high-voltage coil 41 has multiple taps, with the coil between adjacent taps forming a portion of the turns of the single-phase high-voltage coil 41. Each tap is connected to a stationary contact of a single-phase voltage regulating switch. The moving contact of the voltage regulating switch can select any two stationary contacts of the single-phase voltage regulating switch, thereby adjusting the number of turns of the single-phase high-voltage coil 41 connected to the circuit, and consequently adjusting the voltage ratio between the second high-voltage winding 40 and the second low-voltage winding 50. This allows the transformer to meet the power system's voltage regulation requirements when used as an auxiliary transformer to provide auxiliary power to the power system.

[0058] For example, such as Figure 1As shown, an exemplary single-phase high-voltage coil 41 includes six taps, which are sequentially arranged from the first end to the second end as follows: first tap 7, second tap 5, third tap 3, fourth tap 2, fifth tap 4, and sixth tap 6. Each of these taps is connected to a stationary contact of a single-phase voltage regulator switch, enabling the second transformer to achieve voltage regulation of five levels: ±2 × 2.5% on the high-voltage side. When the moving contact of the single-phase voltage regulator switch selects the stationary contact corresponding to the third tap 3 and the fourth tap 2, the third tap 3 and the fourth tap 2 are connected, and all turns of the single-phase high-voltage coil 41 are connected to the circuit. The turns ratio of the second high-voltage winding 40 to the second low-voltage winding 50 is the largest, and the voltage of the second low-voltage winding 50 is the smallest. When the moving contact of the one-way voltage regulator selects the stationary contact corresponding to the third tap 3 and the fifth tap 4, the third tap 3 and the fifth tap 4 are connected. At this time, the number of turns of the single-phase high-voltage coil 41 connected to the circuit is the total number of turns of the single-phase high-voltage coil 41 minus the number of turns between the fourth tap 2 and the fifth tap 4. The turns ratio of the second high-voltage winding 40 to the second low-voltage winding 50 decreases, and the voltage of the second low-voltage winding 50 increases. When the moving contact of the one-way voltage regulator selects the stationary contact corresponding to the second tap 5 and the fifth tap 4, the second tap 5 and the fifth tap 4 are connected. At this time, the number of turns of the single-phase high-voltage coil 41 connected to the circuit is the total number of turns of the single-phase high-voltage coil 41 minus the number of turns between the second tap 5 and the fifth tap 4. The turns ratio of the second high-voltage winding 40 to the second low-voltage winding 50 decreases, and the voltage of the second low-voltage winding 50 increases. At this time, the voltage on the high-voltage side of the second transformer body can be the rated voltage. When the moving contact of the one-way tap changer selects the stationary contact corresponding to the second tap 5 and the sixth tap 6, the second tap 5 and the sixth tap 6 are connected. At this time, the number of turns of the single-phase high-voltage coil 41 connected to the circuit is the total number of turns of the single-phase high-voltage coil 41 minus the number of turns between the second tap 5 and the sixth tap 6. The turns ratio of the second high-voltage winding 40 to the second low-voltage winding 50 decreases, and the voltage of the second low-voltage winding 50 increases. When the moving contact of the one-way voltage regulator selects the stationary contact corresponding to the first tap 7 and the sixth tap 6, the first tap 7 and the sixth tap 6 are connected. At this time, the number of turns of the single-phase high-voltage coil 41 connected to the circuit is the total number of turns of the single-phase high-voltage coil 41 minus the number of turns between the first tap 7 and the sixth tap 6. The turns ratio of the second high-voltage winding 40 to the second low-voltage winding 50 is the smallest, and the voltage of the second low-voltage winding 50 is the largest.

[0059] like Figure 4 and Figure 5As shown, the oil tank 20 includes a first tank bottom 201, a second tank bottom 202, and a first tank side plate 203. The first tank bottom 201 and the second tank bottom 202 are spaced apart. One end of the first tank side plate 203 is connected to the first tank bottom 201, and the other end of the first tank side plate 203 is connected to the second tank bottom 202. The first device body 100 is fixed to the first tank bottom 201, and the second device body 200 is fixed to the second tank bottom 202. The first device body 100 and the second device body 200 have different heights. By setting the first device body 100 and the second device body 200 on tank bottoms of different heights, the height difference between the top of the first device body 100 and the top of the second device body 200 can be reduced. When connecting the first device body 100 and the second device body 200, the length of the wiring between the first device body 100 and the second device body 200 can be reduced, thereby improving the reliability and simplicity of the wiring between the first device body 100 and the second device body 200. In addition, the arrangement of the first tank bottom 201 and the second tank bottom 202 can reduce the amount of transformer oil used in the second transformer body 200, thus avoiding a large waste of transformer oil on the second transformer body 200 side.

[0060] Optionally, one end of the first tank side plate 203 is connected to the middle area of ​​the first tank bottom 201. The outer side of the second tank bottom 202, the outer side of the first tank side plate 203, and the first tank bottom 201 form a recessed area 204, forming an oil tank 20 with a concave structure, reducing the volume inside the oil tank 20. The first tank bottom 201 is positioned on the outer side of the oil tank 20, creating a stable support structure for the lower part of the oil tank 20. A partition plate 60 is provided within the recessed area 204, connecting to the second tank bottom 202, the first tank side plate 203, and the first tank bottom 201 respectively. The partition plate 60 increases the support strength of the first tank bottom 201, improves the structural strength of the oil tank 20, reduces the probability of deformation of the oil tank 20 during transportation and transfer, and improves the stability of the second transformer body 200. An oil collecting pipe 90 is also provided within the recessed area 204. One end of the oil collecting pipe 90 is connected to the interior of the oil tank 20. A partition plate 60 is provided between two adjacent oil collecting pipes 90, which also serves to separate the oil collecting pipes 90. The partition plate 60 can be set according to the number of oil collecting pipes 90, and no specific limitation is made here. The partition plate 60, the second tank bottom 202, the first tank side plate 203, and the first tank bottom 201 can be an integrally connected structure.

[0061] like Figure 5 and Figure 6As shown, the oil tank 20 also includes a top plate 205, a second side plate 206, a third side plate 207, and a fourth side plate 208. The top plate 205 and the second bottom plate 202 are spaced apart. The second side plate 206 connects one end of the top plate 205 and the other end of the second bottom plate 202. The third side plate 207 is opposite to the second side plate 206 and connects the other end of the top plate 205 and the end of the first bottom plate 201 away from the oil collection pipe 90. There are two fourth side plates 208, which are opposite to each other. The fourth side plates 208 connect the top plate 205, the second side plate 206, the second bottom plate 202, the first side plate 203, the first bottom plate 201, and the third side plate 207. The first tank bottom 201, the second tank bottom 202, the first tank side plate 203, the tank top plate 205, the second tank side plate 206, the third tank side plate 207 and the two fourth tank side plates 208 are arranged to form a closed oil tank 20, and the oil tank 20 has a recessed area 204 that is recessed from the outside to the inside.

[0062] Part of the first tank bottom 201 is placed on the outside of the oil tank 20. During processing, one side wall of the oil tank 20 can be bent inward to form the second tank side plate 206, the second tank bottom 202 and the first tank side plate 203. The first tank side plate 203 is connected to the middle of the first tank bottom 201 to form a sealed oil tank structure.

[0063] In some embodiments, see continue to see Figure 6 As shown, a support base 1200 is provided on the outer side of the first tank bottom 201, and rollers 1300 are provided on the support base 1200. The rollers 1300 are configured to support the transformer on a support surface. The support base 1200 serves to improve the structural strength of the first tank bottom 201, and the oil tank 20 can slide on the support surface with the support of the rollers 1300, facilitating the movement of the transformer. Multiple support bases 1200 can be provided, and each support base 1200 is provided with rollers 1300. Optionally, each support base 1200 includes two channel steels, the grooves of the two channel steels are arranged opposite to each other, and the rollers 1300 are rotatably connected between the bottoms of the two channel steels.

[0064] In some embodiments, combined with Figure 4 , Figure 5 and Figure 7As shown, a first radiator 70 is located on the side of the oil tank 20 with a recessed area 204, and a second radiator 80 is located on the side of the oil tank 20 adjacent to the first radiator 70. The first radiator 70 is connected to a first connecting pipe 110, which is connected to an oil collecting pipe 90 in a one-to-one correspondence. The second radiator 80 is connected to a second connecting pipe 120, which is connected to the oil collecting pipe 90. The oil collecting pipe 90, which connects the second connecting pipe 120 and the first connecting pipe 110, is a square pipe. Transformer oil in the oil tank 20 enters the first radiator 70 through the oil collecting pipe 90 and the first connecting pipe 110, while transformer oil in the oil tank 20 enters the second radiator 80 through the oil collecting pipe 90 and the second connecting pipe 120. During the operation of the first transformer body 100 and the second transformer body 200, the transformer oil in the tank 20 will heat up. At this time, the transformer oil in the tank 20 enters the first radiator 70 and the second radiator 80 through the oil collecting pipe 90 and the connecting pipe. The first radiator 70 and the second radiator 80 circulate and cool the transformer oil before it enters the tank. Connecting the oil collecting pipe 90 simultaneously with the first connecting pipe 110 and the second connecting pipe 120 can improve the circulation efficiency of the transformer oil. Setting the oil collecting pipe 90 as a square pipe can improve the structural strength of the oil collecting pipe 90, allowing it to simultaneously bear the weight of the first radiator 70 and the second radiator 80, reducing the probability of deformation of the oil collecting pipe 90, and facilitating connection with the first connecting pipe 110 and the second connecting pipe 120.

[0065] Optionally, the first radiator 70 and the second radiator 80 are arranged adjacent to each other, and the first connecting pipe 110 and the second connecting pipe 120, which are connected to the same oil collection pipe 90, are also arranged adjacent to each other. This facilitates the connection between the oil collection pipe 90, the first connecting pipe 110, and the second connecting pipe 120 without increasing the length of the second connecting pipe 120. The second connecting pipe 120, which is connected to the second radiator 80 but is not adjacent to the first connecting pipe 110, is directly connected to the oil tank 20. The oil collection pipe 90, which is only connected to the first connecting pipe 110, can be a circular pipe, and no specific limitation is made here.

[0066] A third radiator 1400 is also provided on the side of the oil tank 20 opposite to the first radiator 70. The third radiator 1400 is connected to the oil tank 20 through a third connecting pipe 1500. Multiple radiators are installed around the oil tank 20 to improve the efficiency of transformer oil cooling, thereby improving the transformer's operating efficiency.

[0067] The oil collecting pipe 90 is located within the recessed area 204. To ensure an effective connection between the oil collecting pipe 90 and the first radiator 70, the length of the oil collecting pipe 90 needs to be increased. To ensure the structural strength of the connection between the oil collecting pipe 90 and the oil tank 20 and to prevent oil leakage from the radiator during long-distance transportation, a first reinforcing rib 130 is connected between the oil collecting pipe 90 and the side plate 203 of the first tank. Each oil collecting pipe 90 can be connected to multiple first reinforcing ribs 130, which are spaced apart circumferentially around the oil collecting pipe 90 to improve the structural strength of the connection between the oil collecting pipe 90 and the oil tank 20.

[0068] A second reinforcing rib 140 is provided between the first connecting pipe 110 and the oil collecting pipe 90 to improve the connection strength between the first radiator 70 and the oil collecting pipe 90 and prevent oil leakage from the first radiator 70. Multiple second reinforcing ribs 140 may be provided, and these ribs are spaced apart circumferentially around the first connecting pipe 110.

[0069] A third reinforcing rib 150 connects the second connecting pipe 120 to the oil collecting pipe 90 to improve the connection strength between the second radiator 80 and the oil collecting pipe 90, thus preventing oil leakage from the second radiator 80. Multiple third reinforcing ribs 150 can be provided, arranged circumferentially around the second connecting pipe 120. A fourth reinforcing rib 160 connects the second connecting pipe 120 to the bottom of the first tank 201 to support the second connecting pipe 120.

[0070] One end of the first transformer body 100 is fixed to the first tank bottom 201, and one end of the second transformer body 200 is fixed to the second tank bottom 202. To ensure the stability of the transformer during long-distance transportation and operation, in some embodiments, such as... Figure 7 and Figure 8As shown, the transformer also includes a first upper clamp 170, a second upper clamp 180, a first fixing member 190, and a second fixing member 1100, which are used to stably fix the first transformer body 100 and the second transformer body 200 inside the oil tank 20. Specifically, the first upper clamp 170 abuts against the end of the first body 100 opposite to the first tank bottom 201, and the second upper clamp 180 abuts against the end of the second body 200 opposite to the second tank bottom 202. The first upper clamp 170 and the second upper clamp 180 extend in the same direction and have the same length. One end of the first upper clamp 170 and one end of the second upper clamp 180 are connected to the same first fixing member 190, and the other ends of the first upper clamp 170 and the second upper clamp 180 are also connected to the same first fixing member 190. The first fixing member 190 is connected to the inner wall of the oil tank 20 through the second fixing member 1100. The first upper clamp 170 and the second upper clamp 180 extend in the same direction and have the same length, which allows the first upper clamp 170 and the second upper clamp 180 to be connected to the same first fixing member 190, saving the number of parts used and simplifying the structure. The first transformer body 100 is connected to the oil tank 20 via the first upper clamp 170, the first fixing member 190, and the second fixing member 1100. The second transformer body 200 is connected to the oil tank 20 via the second upper clamp 180, the first fixing member 190, and the second fixing member 1100. This forms an integral fixed structure with the oil tank 20, which improves the structural stability of the transformer and ensures the stability of the transformer during long-distance transportation and operation.

[0071] Optionally, the first upper clamp 170 extends along the arrangement direction of the three-phase core posts of the first transformer body 100, so that the first upper clamp 170 can simultaneously fix the three-phase core posts of the first transformer body 100. The second upper clamp 180 extends along the arrangement direction of the three-phase core posts of the second transformer body 200, so that the second upper clamp 180 can simultaneously fix the three-phase core posts of the second transformer body 200. When the arrangement direction of the three-phase core posts of the first transformer body 100 and the three-phase core posts of the second transformer body 200 is the same, the extension direction of the first upper clamp 170 and the second upper clamp 180 is the same.

[0072] Optionally, the end of the first vessel body 100 facing away from the first tank bottom 201 is higher than the end of the second vessel body 200 facing away from the second tank bottom 202. The side of the second upper clamp 180 facing away from the second vessel body 200 is flush with the side of the first upper clamp 170 facing away from the first vessel body 100, and the side of the second upper clamp 180 facing away from the second vessel body 200 and the side of the first upper clamp 170 facing away from the first vessel body 100 are respectively connected to the first fixing member 190. The flush arrangement of one side of the first upper clamp 170 and one side of the second upper clamp 180 improves the overall stability of the connection between the first vessel body 100 and the second vessel body 200 and the oil tank 20, and facilitates the connection of the first upper clamp 170 and the second upper clamp 180 to the same first fixing member 190.

[0073] It should be noted that the technical solution provided in this embodiment of the invention can reduce the size and production cost of the transformer while ensuring its functionality by setting the electrical connection relationship of the transformer, namely, the parallel electrical connection relationship of the first high-voltage winding 30 of the first transformer body 100 and the second high-voltage winding 40 of the second transformer body 200. Furthermore, by setting the mechanical structure of the transformer, the wiring reliability and structural strength of the transformer can be improved, and the utilization rate of transformer oil can be increased. The electrical connection relationship and mechanical structure of the transformer can be independent technical solutions or combined into a whole solution; no limitation is made here.

[0074] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A transformer, characterized in that, The vessel includes an oil tank (20), a first vessel body (100), and a second vessel body (200). The oil tank (20) includes a first tank bottom (201), a second tank bottom (202), and a first tank side plate (203). The first tank bottom (201) and the second tank bottom (202) are spaced apart. One end of the first tank side plate (203) is connected to the middle area of ​​the first tank bottom (201), and the other end of the first tank side plate (203) is connected to one end of the second tank bottom (202). The first vessel body... (100) is fixed to the first box bottom (201), the second body (200) is fixed to the second box bottom (202), the outer side of the second box bottom (202), the outer side of the first box side plate (203) and the first box bottom (201) form a recessed area (204), the recessed area (204) is provided with a partition plate (60), the partition plate (60) is connected to the second box bottom (202), the first box side plate (203) and the first box bottom (201) respectively; The recessed area (204) is provided with an oil collection pipe (90), one end of which is connected to the inside of the oil tank (20), and a partition plate (60) is provided between two adjacent oil collection pipes (90).

2. The transformer according to claim 1, characterized in that, The oil tank (20) has a first radiator (70) on one side of the recessed area (204), and a second radiator (80) on the side of the oil tank (20) adjacent to the first radiator (70). The first radiator (70) is connected to a first connecting pipe (110), and the first connecting pipe (110) is connected to the oil collection pipe (90) in a one-to-one correspondence. The second radiator (80) is connected to a second connecting pipe (120), and the second connecting pipe (120) is connected to the oil collection pipe (90). The oil collection pipe (90), which is connected to both the second connecting pipe (120) and the first connecting pipe (110), is a square pipe.

3. The transformer according to claim 2, characterized in that, A first reinforcing rib (130) is connected between the oil collecting pipe (90) and the first box side plate (203). And / or, a second reinforcing rib (140) is connected between the first connecting pipe (110) and the oil collecting pipe (90). And / or, a third reinforcing rib (150) is connected between the second connecting pipe (120) and the oil collecting pipe (90). And / or, a fourth reinforcing rib (160) is connected between the second connecting pipe (120) and the first box bottom (201).

4. The transformer according to claim 1, characterized in that, The transformer further includes a first upper clamp (170), a second upper clamp (180), a first fixing member (190), and a second fixing member (1100). The first upper clamp (170) abuts against the end of the first transformer body (100) away from the bottom of the first tank (201), and the second upper clamp (180) abuts against the end of the second transformer body (200) away from the bottom of the second tank (202). The first upper clamp (170) and the second upper clamp (180) extend in the same direction and have the same length. One end of the first upper clamp (170) and one end of the second upper clamp (180) are connected to the same first fixing member (190). The other end of the first upper clamp (170) and the other end of the second upper clamp (180) are connected to the same first fixing member (190). The first fixing member (190) is connected to the inner wall of the oil tank (20) through the second fixing member (1100).

5. The transformer according to claim 4, characterized in that, The end of the first body (100) away from the first box bottom (201) is higher than the end of the second body (200) away from the second box bottom (202). The side of the second upper clamp (180) away from the second body (200) is flush with the side of the first upper clamp (170) away from the first body (100). The side of the second upper clamp (180) away from the second body (200) and the side of the first upper clamp (170) away from the first body (100) are respectively connected to the first fixing member (190).

6. The transformer according to claim 1, characterized in that, The outer side of the first box bottom (201) is provided with a support seat (1200), and the support seat (1200) is provided with a roller (1300), which is configured to support on the support surface.

7. The transformer according to claim 1, characterized in that, It also includes a high-pressure bushing (10) and a low-pressure bushing (501) disposed on the oil tank (20). The first transformer body (100) includes a first high-voltage winding (30), and the neutral point (N) of the first high-voltage winding (30) is grounded; the second transformer body (200) includes a magnetically coupled second high-voltage winding (40) and a second low-voltage winding (50), and the single-phase line terminals of the second high-voltage winding (40) are respectively connected to the same-phase line terminals of the first high-voltage winding (30); the same-phase line terminals of the first high-voltage winding (30) and the second high-voltage winding (40) are led out to the outside of the oil tank (20) through the same high-voltage bushing (10), and the second low-voltage winding (50) is led out to the outside of the oil tank (20) through the low-voltage bushing (501).

8. The transformer according to claim 7, characterized in that, The first high-voltage winding (30) is connected in a Z-shape, and the second high-voltage winding (40) is connected in a D-shape.

9. The transformer according to claim 7, characterized in that, The second low-voltage winding (50) is connected in an yn configuration.

10. The transformer according to claim 7, characterized in that, The second high-voltage winding (40) includes a high-voltage coil and a voltage regulating switch; the first end of the single-phase high-voltage coil (41) serves as the single-phase winding connection end of the second high-voltage winding (40), and the second end of the single-phase high-voltage coil (41) serves as the single-phase line terminal of the second high-voltage winding (40); the high-voltage coil also includes multiple taps, which are connected to the stationary contact of the voltage regulating switch, and the moving contact of the voltage regulating switch is used to select any two stationary contacts of the voltage regulating switch.

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