Transformer cable terminal outgoing line oil way system and transformer equipment

Abstract

The utility model provides a transformer cable terminal outgoing line oil way system which comprises an ascending flanged base, an oil-oil sleeve and a connecting pipe, the ascending flanged base is provided with a first sleeve, the first sleeve is in butt joint with a second sleeve arranged on an oil tank of a transformer, and the connecting pipe is connected with the oil-oil sleeve. The oil-oil sleeve is arranged in an internal space formed by butt joint of the first sleeve and the second sleeve in a penetrating mode, one end of the oil-oil sleeve is connected with an oil tank, the other end of the oil-oil sleeve is connected with a cable terminal at the ascending flanged base, and the first sleeve and the second sleeve are separated from each other at the butt joint position except the penetrating position of the oil-oil sleeve. The two ends of the connecting pipe are connected with the first sleeve and the second sleeve respectively, and the connecting pipe is provided with a valve so that the first sleeve and the second sleeve can be connected or disconnected. The transformer cable terminal outgoing line oil way system is simple in structure and convenient to operate, low-voltage and partial discharge tests can be conveniently executed, and cost is effectively reduced. The utility model further provides transformer equipment.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformers, and particularly relates to a transformer cable terminal outgoing oil circuit system and a transformer device. Background Art

[0002] With the continuous increase in the development of current offshore wind power projects, the manufacturing requirements and on-site installation requirements for transformers are getting higher and higher. Due to the limited space on the offshore platform, the high-voltage side of the transformer generally adopts a cable terminal outgoing line, an oil-oil bushing and a plug-in cable terminal connection structure.

[0003] Currently, when performing low-voltage and partial discharge tests on the transformer at the site, it is necessary to drain the oil in the riser, then expose the inside of the riser to the air, and then disconnect the oil-oil bushing and the cable terminal to conduct the test. After the test is completed, first connect the oil-oil bushing and the cable terminal, and then inject oil. However, since the riser is often directly connected to the oil tank in the previous structure, it is necessary to completely drain all the oil in the oil tank side of the transformer to ensure that the test is not affected when draining the oil in the riser. This results in a large amount of waste of oil, increases the cost, and at the same time increases the operation complexity and is not convenient for the test. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a transformer cable terminal outgoing oil circuit system aiming at the above deficiencies existing in the prior art. The system has a simple structure and is convenient to operate, is convenient to perform low-voltage and partial discharge tests, and effectively reduces the cost. The utility model also provides a transformer device.

[0005] The utility model provides a transformer cable terminal outgoing oil circuit system, which includes a riser, an oil-oil bushing and a connecting pipe. A first bushing is provided on the riser, and the first bushing is butt-connected to a second bushing provided on the oil tank of the transformer. The oil-oil bushing is arranged in the internal space formed by the butt joint of the first bushing and the second bushing, one end is connected to the oil tank, and the other end is connected to the cable terminal at the riser. At the butt joint position of the first bushing and the second bushing, the other positions except the position where the oil-oil bushing penetrates are separated from each other. The two ends of the connecting pipe are respectively connected to the first bushing and the second bushing, and a valve is provided to realize the connection or disconnection of the first bushing and the second bushing.

[0006] Further, flanges are provided at the butt joint end of the first bushing and the butt joint end of the second bushing. The first bushing and the second bushing are butt-connected and connected through the flanges. Through holes allowing the oil-oil bushing to pass through are provided on the flanges, so as to separate the first bushing and the second bushing while allowing the oil-oil bushing to penetrate.

[0007] Further, a sealing rubber layer is clamped between the flange butt joint surfaces on the first sleeve and the second sleeve, and the sealing rubber layer is used to seal the gaps between the two flanges and between the flange and the oil-filled sleeve.

[0008] Further, the end of the connecting pipe is located at the middle position of the first sleeve / second sleeve.

[0009] Further, the riser base body is arranged in the vertical direction, and a first sleeve extending in the horizontal direction is provided on the side wall. The second sleeve is arranged horizontally and is coaxial with the first sleeve.

[0010] Further, an oil injection and drainage valve is provided at the bottom of the riser base for draining the oil in the riser base or injecting oil into the riser base.

[0011] Further, a vacuum extraction valve is provided at the top of the riser base for evacuating the riser base during the process of injecting oil into the riser base through the oil injection and drainage valve.

[0012] Further, a gas guiding valve is provided at the top of the riser base for discharging the decomposition gas during the operation of the transformer cable terminal outgoing oil circuit system; the gas guiding valve is communicated with the conservator through an oil circuit so that the conservator can supplement oil to the transformer cable terminal outgoing oil circuit system.

[0013] Further, the second sleeve provided on the oil tank includes two segments. One segment is a fixed segment fixedly connected to the oil tank, and the other segment is a cylindrical structure segment. One end of the cylindrical structure segment is butt-connected to the second sleeve, and the other end is detachably connected to the fixed segment.

[0014] A transformer device provided by the utility model includes an oil tank, a cable terminal, a conservator, and the above-mentioned transformer cable terminal outgoing oil circuit system. In the transformer cable terminal outgoing oil circuit system, the first sleeve of the riser base is butt-connected to the second sleeve provided on the oil tank. The top of the riser base is connected to the conservator, and the bottom is connected to the cable terminal. The oil-filled sleeve is arranged in the internal space formed by the butt joint of the first sleeve and the second sleeve, with one end connected to the oil tank and the other end connected to the cable terminal at the riser base. At the butt joint position of the first sleeve and the second sleeve, except for the position where the oil-filled sleeve passes through, the other positions are separated from each other. The two ends of the connecting pipe are respectively connected to the first sleeve and the second sleeve, and a valve is provided to realize the connection or disconnection of the first sleeve and the second sleeve.

[0015] The oil circuit system for the outgoing cable terminal of the transformer of the present utility model has the riser not directly connected to the oil tank side of the transformer. The two are connected by butt-joint of the first sleeve and the second sleeve. And at the butt-joint position, except for the position where the oil-removing sleeve penetrates, the remaining positions are separated from each other, so that the oil in the riser and the oil in the transformer oil tank are isolated from each other, and the first sleeve and the second sleeve are connected by a connecting pipe provided with a valve, so as to realize the isolatable connection of the oil in the two areas.

[0016] Since the oil in the riser and the oil in the transformer oil tank can be connected and can also be isolated by closing the valve, when it is necessary to conduct low-voltage and partial discharge tests on site, only the oil in the riser can be emptied, and it is not necessary to empty the oil on the transformer oil tank side, which can provide enough space for the test, and the oil-removing sleeve and the cable terminal can be disconnected to conduct the test. After the test is completed, only the riser needs to be refilled with oil. Therefore, it is convenient for test operation, and at the same time, the oil consumption is greatly reduced, and the cost is saved. Brief Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the oil circuit system for the outgoing cable terminal of the transformer in Embodiment 1 of the present utility model;

[0018] Figure 2 is a top view schematic diagram of the oil circuit system for the outgoing cable terminal of the transformer in Embodiment 1 of the present utility model.

[0019] In the figure: 1, riser; 11, first sleeve; 12, oil injection and drainage valve; 13, vacuum pumping valve; 14, gas guiding valve; 2, oil-removing sleeve; 3, connecting pipe; 31, valve; 4, oil tank; 41, second sleeve; 5, cable terminal. Detailed Embodiments

[0020] Next, the technical solutions in the present utility model will be clearly and completely described in conjunction with the drawings in the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts shall fall within the scope of the present utility model.

[0021] In the description of the present utility model, it should be noted that the terms "upper", "lower", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model.

[0022] In the description of the present utility model, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0023] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "connection", "installation", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] Embodiment 1

[0025] As Figure 1 and Figure 2 shown, the oil circuit system for the outgoing line of the transformer cable terminal in this embodiment includes a riser 1, an oil-filled bushing 2, and a connecting pipe 3. A first bushing 11 is provided on the riser 1. The first bushing 11 is butt-connected to a second bushing 41 provided on the oil tank 4 of the transformer. The oil-filled bushing 2 is arranged in the internal space formed by the butt-joint of the first bushing 11 and the second bushing 41, with one end connected to the oil tank 4 and the other end connected to the cable terminal 5 at the riser 1. At the butt-joint position of the first bushing 11 and the second bushing 41, the remaining positions except the position where the oil-filled bushing 2 penetrates are separated from each other. Both ends of the connecting pipe 3 are respectively connected to the first bushing 11 and the second bushing 41, and a valve 31 is provided to realize the connection or cut-off between the first bushing 11 and the second bushing 41.

[0026] In the oil circuit system for the outgoing line of the transformer cable terminal in this embodiment, the riser 1 and the oil tank 4 side of the transformer are not directly connected. The two are butt-connected through the first bushing 11 and the second bushing 41, and at the butt-joint position, the remaining positions except the position where the oil-filled bushing 2 penetrates are separated from each other, so that the oil in the riser 1 and the oil in the transformer oil tank 4 are isolated from each other, and the first bushing 11 and the second bushing 41 are connected through the connecting pipe 3 provided with the valve 31, so as to realize the isolatable connection of the oil in the two regions.

[0027] Since the oil in the riser 1 and the oil in the transformer oil tank 4 can be connected and can also be isolated by closing the valve 31, when it is necessary to conduct a low-voltage and partial discharge test on site, only the oil in the riser 1 needs to be emptied, and it is not necessary to empty the oil on the transformer oil tank 4 side, which can provide enough space for the test, and the oil-filled bushing 2 and the cable terminal 5 can be disconnected to conduct the test. After the test is completed, only the riser 1 needs to be refilled with oil. Therefore, it is convenient for test operation, and at the same time, the oil consumption is greatly reduced, saving costs.

[0028] In this embodiment, flanges are provided at the docking ends of the first sleeve 11 and the second sleeve 41. The first sleeve 11 and the second sleeve 41 are docked and connected through the flanges. The flanges are provided with through holes allowing the oil-oil casing 2 to pass through, so as to separate the first sleeve 11 and the second sleeve 41 while allowing the oil-oil casing 2 to penetrate.

[0029] In this embodiment, a sealing rubber layer is clamped between the flange docking surfaces on the first sleeve 11 and the second sleeve 41. The sealing rubber layer is used to seal the gaps between the two flanges and between the flanges and the oil-oil casing 2 to avoid oil leakage. The flange can be selected as a circular flange structure, the flange diameter is 1050 mm, and the aperture of the mounting hole is adapted to the oil-oil casing 2.

[0030] In this embodiment, the end of the connecting pipe 3 is located at the middle position of the first sleeve 11 / second sleeve 41. This embodiment uses a flexible pipe as the connecting pipe 3 to reduce the hard stress during installation, avoid cracking at the connection between the valve and the connecting pipe 3, and at the same time can effectively control the installation of the connecting pipe 3. The end of the connecting pipe 3 is located on the sleeve and is not directly connected to the fuel tank, which can avoid problems such as too long length of the connecting pipe 3 and difficult control of the installation dimensions, and at the same time avoid cracking at the connection between the valve and the connecting pipe 3 caused by such a hard connection.

[0031] In this embodiment, the body of the lifting seat 1 is arranged vertically, and a first sleeve 11 extending horizontally is provided on the side wall. The second sleeve 41 is arranged horizontally and is coaxial with the first sleeve 11.

[0032] In this embodiment, an oil injection / drainage valve 12 is provided at the bottom of the lifting seat 1 for discharging the oil in the lifting seat 1 or injecting oil into the lifting seat 1.

[0033] In this embodiment, a vacuum extraction valve 13 is provided at the top of the lifting seat 1 for evacuating the lifting seat 1 during the process of injecting oil into the lifting seat 1 through the oil injection / drainage valve 12, so as to ensure that the lifting seat 1 is filled with oil and the gas is completely extracted.

[0034] In this embodiment, the oil injection / drainage valve, the vacuum extraction valve, and the gas guiding valve adopted can all be ball valves.

[0035] In this embodiment, a gas guide valve 14 is provided at the top of the riser 1, which is used to discharge the decomposed gas during the operation of the oil circuit system of the transformer cable terminal. During the operation of the transformer, a small amount of gas will be decomposed from the transformer oil. In this embodiment, the gas guide valve 14 is provided so that these gases can flow through the gas guide valve 14 into the gas relay. The gas guide valve 14 is installed at the highest point of the riser, effectively avoiding gas accumulation in the protruding part of the riser, thereby preventing the gas volume from increasing to a certain extent and causing partial discharge. The gas guide valve 14 is communicated with the conservator through an oil circuit (i.e., a connecting pipe for circulating oil), so that the conservator can supply oil to the oil circuit system of the transformer cable terminal. When the internal oil volume of the transformer decreases during operation, the oil in the conservator will inject oil into the transformer through the oil circuit.

[0036] In this embodiment, the second bushing 41 provided on the oil tank 4 includes two segments. One segment is a fixed segment fixedly connected to the oil tank 4, and the other segment is a cylindrical structure segment. One end of the cylindrical structure segment is butt-connected to the second bushing 41, and the other end is detachably connected to the fixed segment. This two-segment structure solution can reduce the transportation width of the transformer. During transportation, the outer segment (i.e., the cylindrical structure segment) is removed and then transported, saving transportation costs. The two segments can also be connected by a circular flange structure. The flange diameter is 1050 mm, the mounting hole diameter is 1000 mm, and a sealing rubber layer is crimped in the middle of the flange butt joint surface to avoid oil leakage.

[0037] In summary, this embodiment provides an oil circuit system with a simple structure, convenient operation, and cost-saving in testing. The sleeve between the riser and the oil tank is fabricated and connected in sections, reducing the transportation width and saving transportation costs. A flexible hose is used to connect between the riser and the oil tank, reducing the hard stress during installation, avoiding cracking at the connection between the valve and the connecting pipe, and effectively controlling the installation dimensions of the connecting pipe. At the same time, several oil circuit valves added on the riser also facilitate low-voltage and partial discharge tests on-site, saving test time and costs. When conducting low-voltage and partial discharge tests on-site, close the valve 31 and the gas guide valve 14, open the oil injection and drainage valve 12 to drain the oil. After draining the oil, close the oil injection and drainage valve 12 to make the riser 1 empty (emptying means draining all the oil in the riser 1. When draining the oil, gas will enter the riser 1, which is equivalent to being exposed to the air), and disconnect the oil-oil bushing 2 from the cable terminal 5 to conduct the test. After the test is completed, connect the oil-oil bushing 2 to the cable terminal 5, open the oil injection and drainage valve 12 to inject oil, and at the same time, the vacuum pumping valve 13 is used to pump vacuum. After filling, close the oil injection and drainage valve 12 and the vacuum pumping valve 13, and at the same time open the valve 31 and the gas guide valve 14, and the transformer can operate. The gas guide valve 14 is always open during normal operation. The oil circuit system of this embodiment enables the transformer to not need to completely drain the oil in the transformer body during on-site tests, which is convenient for on-site operation, testing, and cost-saving.

[0038] Embodiment 2

[0039] The transformer equipment of this embodiment includes an oil tank 4, a cable terminal 5, an oil conservator, and the transformer cable terminal outgoing oil circuit system in Embodiment 1. In the transformer cable terminal outgoing oil circuit system, the first bushing 11 of the riser 1 is butt-connected to the second bushing 41 provided on the oil tank 4. The top of the riser 1 is connected to the oil conservator, and the bottom is connected to the cable terminal 5. The oil cleaning bushing 2 is arranged in the internal space formed by the butt-joint of the first bushing 11 and the second bushing 41, with one end connected to the oil tank 4 and the other end connected to the cable terminal 5 at the riser 1. At the butt-joint position of the first bushing 11 and the second bushing 41, the rest of the positions except the position where the oil cleaning bushing 2 penetrates are separated from each other. Both ends of the connecting pipe 3 are respectively connected to the first bushing 11 and the second bushing 41, and a valve 31 is provided to realize the connection or disconnection of the first bushing 11 and the second bushing 41.

[0040] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention. However, the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. A transformer cable terminal outlet oil circuit system, characterized in that: It comprises a lifting seat (1), an oil casing (2) and a connecting pipe (3). The lifting seat (1) is provided with a first sleeve (11), and the first sleeve (11) is butt-connected with a second sleeve (41) provided on the oil tank (4) of the transformer. The oil casing (2) is inserted into the internal space formed by the first casing (11) and the second casing (41) being connected, one end of which is connected to the oil tank (4) and the other end of which is connected to the cable terminal (5) at the lifting seat (1). The first casing (11) and the second casing (41) are separated from each other at the butt joint position except for the position where the oil casing (2) penetrates. The two ends of the connecting pipe (3) are respectively connected to the first sleeve (11) and the second sleeve (41), and are provided with a valve (31) to achieve the connection or disconnection between the first sleeve (11) and the second sleeve (41).

2. The transformer cable terminal outlet oil circuit system according to claim 1, characterized in that: A flange is provided at the butt end of the first sleeve (11) and the butt end of the second sleeve (41), and the first sleeve (11) and the second sleeve (41) are butt-jointed and connected via the flange. The flange is provided with a through hole for allowing the oil casing (2) to pass through, thereby allowing the oil casing (2) to pass through while separating the first casing (11) and the second casing (41).

3. The transformer cable terminal outlet oil circuit system according to claim 2, characterized in that: A sealing rubber layer is sandwiched between the flange abutting surfaces on the first sleeve (11) and the second sleeve (41). The sealing rubber layer is used to seal the gap between the two flanges and the gap between the flange and the oil casing (2).

4. The transformer cable terminal outlet oil circuit system according to claim 1, characterized in that: The end of the connecting pipe (3) is located at the middle of the first sleeve (11) / the second sleeve (41).

5. The transformer cable terminal outlet oil circuit system according to claim 1, characterized in that: The main body of the lifting seat (1) is arranged in a vertical direction, and a first sleeve (11) extending in a horizontal direction is arranged on the side wall. The second sleeve (41) is arranged horizontally and is coaxial with the first sleeve (11).

6. The transformer cable terminal outlet oil circuit system according to claim 1, characterized in that: An oil filling and draining valve (12) is provided at the bottom of the lifting seat (1) for draining the oil in the lifting seat (1) or filling the lifting seat (1) with oil.

7. The transformer cable terminal outlet oil circuit system according to claim 6, characterized in that: A vacuum valve (13) is provided on the top of the lifting seat (1) for vacuuming the lifting seat (1) during the process of injecting oil into the lifting seat (1) through the oil injection and release valve (12).

8. The transformer cable terminal outlet oil circuit system according to claim 1, characterized in that: The top of the lifting seat (1) is provided with a gas guide valve (14) for guiding out the decomposition gas of the transformer cable terminal outlet oil circuit system during operation; The air guide valve (14) is connected to the oil conservator through an oil circuit, so that the oil conservator can replenish oil to the transformer cable terminal outlet oil circuit system.

9. The transformer cable terminal outlet oil circuit system according to claim 1, characterized in that: The second sleeve (41) provided on the oil tank (4) comprises two sections, one section being a fixed section fixedly connected to the oil tank (4), and the other section being a cylindrical structure section. One end of the cylindrical structure section is butt-connected to the second sleeve (41), and the other end is detachably connected to the fixed section.

10. A transformer device, characterized in that: It comprises an oil tank (4), a cable terminal (5), an oil storage cabinet and a transformer cable terminal outlet oil circuit system as claimed in any one of claims 1 to 9, In the transformer cable terminal outlet oil circuit system, a first sleeve (11) of the lifting seat (1) is butt-connected with a second sleeve (41) provided on the oil tank (4). The top of the lifting seat (1) is connected to the oil storage cabinet, and the bottom is connected to the cable terminal (5). The oil casing (2) is inserted into the internal space formed by the first casing (11) and the second casing (41) being connected, one end of which is connected to the oil tank (4) and the other end of which is connected to the cable terminal (5) at the lifting seat (1). The first casing (11) and the second casing (41) are separated from each other at the butt joint position except for the position where the oil casing (2) penetrates. The two ends of the connecting pipe (3) are respectively connected to the first sleeve (11) and the second sleeve (41), and are provided with a valve (31) to achieve the connection or disconnection between the first sleeve (11) and the second sleeve (41).

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