High plant transformer oil tank and on-load tap changer arrangement structure

Abstract

The utility model relates to a high plant transformer oil tank and on-load tap changer arrangement structure which comprises an oil tank of a transformer, radiators are connected to the two sides of the oil tank in the long axis direction, an oil conservator is connected to one side of the oil tank in the short axis direction, a wire inlet sleeve is connected to the top of the oil tank through an enclosed bus, and a coil and three tap changers are arranged in the oil tank. The three voltage regulating switches are arranged on the same straight line and parallel to the coil, the three voltage regulating switches are located on the side, away from the low-voltage side of the transformer, of the coil, and transmission shafts of the three voltage regulating switches are in a three-in-one mode and connected with an electric mechanism. The three-phase voltage regulating switch is parallel to the coil, and the arrangement mode of the voltage regulating switch is optimized, so that the oil tank structure is simplified, the cost of the transformer is reduced, the electric field distribution is improved, the lead loss is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a high-voltage transformer oil tank and on-load tap-changing switch arrangement structure. Background Art

[0002] A high-voltage transformer is a special transformer in a thermal power plant. It is primarily connected to the transformer that supplies the plant's power supply at the generator output, providing power to various equipment within the plant. It is a critical piece of equipment in a thermal power plant, playing a vital role in ensuring its normal operation, safety, and stability. The "Twenty-Five Key Requirements for Preventing Power Production Accidents (2023 Edition)" issued by the National Energy Administration in 2023 stipulates that when high-voltage transformers use on-load tap changers, the tap changer should be a single-phase on-load tap changer.

[0003] The traditional on-load tap-changer structure is that the three-phase tap-changer 3 is arranged at one end of the coil 2 arrangement direction in the transformer tank 1 and is perpendicular to the coil arrangement direction (such as Figure 1 As shown in the figure, this structure has the following disadvantages: 1. The width of the oil tank on the switch side of the transformer increases in the long axis direction, generally exceeding 3 meters, which makes the transformer transportation beyond the limit, causing transportation difficulties and increased costs; 2. The oil tank has a T-shaped structure, which increases the difficulty of designing the oil tank on the switch side; 3. The three-phase leads cross inside the transformer, resulting in abnormal electric field strength and increased lead loss; 4. The short-circuit resistance of the high and low voltage sides of the transformer is poor. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a high-voltage transformer oil tank and on-load voltage regulating switch arrangement structure, which simplifies the oil tank structure, optimizes the arrangement of the voltage regulating switch, reduces costs, and has good short-circuit resistance.

[0005] The utility model is realized through the following technical scheme: a high-voltage transformer oil tank and on-load tap-changing switch arrangement structure, comprising an oil tank of a transformer, wherein both sides of the oil tank in the long axis direction are connected to a radiator, one side of the oil tank in the short axis direction is connected to an oil storage cabinet, the top of the oil tank is connected to an incoming line bushing through a closed busbar, a coil and three tap-changing switches are provided in the oil tank, the three tap-changing switches are arranged in a straight line and parallel to the coil, and the three tap-changing switches are located on the side of the coil away from the low-voltage side of the transformer, and the transmission shafts of the three tap-changing switches are three-in-one and connected to an electric mechanism.

[0006] As an optimization, the fuel tank has a rectangular structure.

[0007] As an optimization, the voltage regulating switch is a single-phase on-load switch.

[0008] As an optimization, the incoming bushing is located on a side of the coil away from the voltage regulating switch.

[0009] As an optimization, a wire outlet bushing is provided on the side of the voltage regulating switch away from the coil, and the wire outlet bushing is also installed on the top of the oil tank through the closed busbar.

[0010] As an optimization, the closed busbar includes a casing riser fixedly connected to the top of the oil tank, and a busbar interface fixedly connected to the top of the casing riser, and three casing flanges are provided on the top of the busbar interface.

[0011] As an optimization, the busbar interface is a low-magnetic steel plate.

[0012] As an optimization, the side wall of the sleeve riser is provided with a water drain port and an oil drain port.

[0013] The beneficial effects of the present invention are as follows: the three-phase voltage regulating switch is parallel to the coil, and by optimizing the arrangement of the voltage regulating switch, the oil tank structure is simplified, so that the width of the rectangular oil tank in the long axis direction is greatly reduced, and the difficulty of transportation is effectively reduced, thereby reducing the cost of the transformer. Since the coil is between the voltage regulating switch and the incoming bushing, the lead distance is reduced, which facilitates wiring. After the lead is drawn, the out-of-phase tapping is contactless, which improves the electric field distribution and reduces the lead loss, thereby increasing the service life. The incoming bushing and the outgoing bushing are connected by a closed busbar, which can effectively reduce the probability of short circuits and improve the ability to resist short circuits in relatively harsh operating conditions such as power plants. The busbar interface adopts a low-magnetic steel plate design, which can further reduce losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Arrange the structure for the existing oil tank and three-phase voltage regulating switch;

[0015] Figure 2 This is a top view of the utility model;

[0016] Figure 3 This is a side view of the utility model;

[0017] Figure 4 for Figure 3 A magnified view of part A;

[0018] Figure 5 It is the top view of the closed busbar structure;

[0019] As shown in the figure:

[0020] 1. Fuel tank, 2. Coil, 3. Voltage regulating switch, 4. Drive shaft, 5. Electric mechanism, 6. Enclosed busbar, 61. Casing riser, 62. Busbar interface, 63. Casing flange, 64. Oil drain port, 65. Drain port, 66. Connecting hole, 7. Inlet bushing, 8. Radiator, 9. Oil storage cabinet, 10. Outlet bushing. DETAILED DESCRIPTION

[0021] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0022] like Figures 1 to 5 As shown, a high-voltage power plant transformer oil tank and on-load tap changer arrangement structure includes a transformer oil tank 1. The oil tank 1 is a rectangular structure. Radiators 8 are connected to both sides of the oil tank 1 in the long axis direction, and an oil conservator 9 is connected to one side of the oil tank 1 in the short axis direction. The radiator 8 is a plate radiator. The oil filling pipe of the radiator 8 is connected to the oil outlet pipe of the oil tank 1, and the oil outlet pipe of the oil conservator 9 is connected to the oil filling pipe of the oil tank 1.

[0023] The oil tank 1 is provided with a coil 2 and three voltage regulating switches 3. Specifically, the three coils 2 are arranged along the long axis direction in the oil tank 1, and the two sides of the long axis direction of the oil tank form the high-voltage side and the low-voltage side of the transformer respectively.

[0024] The three voltage-regulating switches 3 are arranged in a straight line, parallel to the coil 2, and located on the side of the coil 2 away from the low-voltage side of the transformer. The drive shafts 4 of the three voltage-regulating switches 3 are combined into one and connected to a motorized mechanism 5. Specifically, the voltage-regulating switches 3 are single-phase on-load tap changers. The three voltage-regulating switches 3 are also arranged along the long axis of the fuel tank 1, parallel to the arrangement of the three coils 2. The motorized mechanism 5 described in this embodiment is a commonly used mechanism for driving the voltage-regulating switches 3 and will not be described in detail here.

[0025] The top of the oil tank 1 is connected to an incoming line bushing 7 through a closed busbar 6. The incoming line bushing 7 is located on the side of the coil 2 away from the voltage regulating switch 3. In this embodiment, three incoming line bushings 7 are arranged along the long axis direction on the top of the oil tank 1. The three incoming line bushings 7 are located on the low-voltage side of the transformer.

[0026] A line outlet bushing 10 is provided on the side of the voltage regulating switch 3 away from the coil 2 , and the line outlet bushing 10 is also installed on the top of the oil tank 1 through the closed busbar 6 . In this embodiment, three line outlet bushings 10 are arranged along the long axis direction on the top of the oil tank 1 .

[0027] Specifically, the enclosed busbar 6 includes a sleeve raising seat 61 fixed to the top of the oil tank 1, and a busbar interface 62 fixed to the top of the sleeve raising seat 61. Three sleeve flanges 63 are provided on the top of the busbar interface 62. The incoming sleeve 7 or the outgoing sleeve 10 are both screwed and fixed to the sleeve flanges 63. In this embodiment, the sleeve raising seat 61 is a rectangular structure, and the busbar interface 62 is a rectangular low-magnetic steel plate. The busbar interface 62 is welded and fixed to the top of the sleeve raising seat 61. The outer ring of the busbar interface 62 is provided with multiple connection holes 66 along the circumferential direction for bolt connection with the busbar. The three sleeve flanges 63 are arranged along the long axis of the oil tank 1 and welded and fixed to the top of the busbar interface 62. The three incoming sleeves 7 or the three outgoing sleeves 10 are bolted to the three sleeve flanges 63 one by one to achieve the installation of the incoming sleeve and the outgoing sleeve.

[0028] The side wall of the sleeve raising seat 61 is provided with a drain port 65 and an oil drain port 64. In this embodiment, the oil drain port 61 is located on one side wall of the sleeve raising seat 61 in the long axis direction, and the drain ports 65 are provided on both side walls of the sleeve raising seat 61 in the short axis direction.

[0029] In actual use, because coil 2 is located between the three-phase voltage-regulating switch 3 and the incoming bushing 7, and the three incoming bushings, three coils, three voltage-regulating switches, and three outgoing bushings are all arranged parallel to each other, the lead distance is greatly reduced. A motorized mechanism 5 drives the transmission shaft 4, which drives the three voltage-regulating switches 3 in synchronous operation, ensuring that the three-phase voltage-regulating switches regulate voltage simultaneously.

[0030] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved through or by adopting existing technologies, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A high-voltage transformer oil tank and on-load tap changer arrangement structure, including a transformer oil tank (1), characterized in that: Both sides of the oil tank (1) in the long axis direction are connected to a radiator (8), one side of the oil tank in the short axis direction is connected to an oil storage cabinet (9), the top of the oil tank (1) is connected to an inlet bushing (7) via a closed busbar (6), a coil (2) and three voltage regulating switches (3) are provided in the oil tank (1), the three voltage regulating switches are arranged in a straight line and parallel to the coil, and the three voltage regulating switches (3) are located on a side of the coil (2) away from the low-voltage side of the transformer, and the transmission shafts (4) of the three voltage regulating switches (3) are three-in-one and connected to an electric mechanism (5).

2. The high-voltage transformer oil tank and on-load tap changer arrangement structure according to claim 1 is characterized in that: The oil tank (1) has a rectangular structure.

3. The high-voltage transformer oil tank and on-load tap changer arrangement structure according to claim 1 is characterized in that: The voltage regulating switch (3) is a single-phase on-load switch.

4. The high-voltage transformer oil tank and on-load tap changer arrangement structure according to claim 1 is characterized in that: The incoming line bushing (7) is located on a side of the coil (2) away from the voltage regulating switch (3).

5. The high-voltage transformer oil tank and on-load tap changer arrangement structure according to claim 1 is characterized in that: A wire outlet bushing (10) is provided on the side of the voltage regulating switch (3) away from the coil (2), and the wire outlet bushing is also installed on the top of the oil tank through the closed busbar (6).

6. The high-voltage transformer oil tank and on-load tap changer arrangement structure according to claim 5 is characterized in that: The closed busbar (6) comprises a sleeve elevation seat (61) fixedly connected to the top of the oil tank (1), and a busbar interface (62) fixedly connected to the top of the sleeve elevation seat, and three sleeve flanges (63) are provided on the top of the busbar interface (62).

7. The high-voltage transformer oil tank and on-load tap changer arrangement structure according to claim 6 is characterized in that: The busbar interface (62) is a low-magnetic steel plate.

8. The high-voltage transformer oil tank and on-load tap changer arrangement structure according to claim 6 is characterized in that: The side wall of the sleeve elevation seat (61) is provided with a water outlet (65) and an oil outlet (64).

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