Inflatable transformer for offshore wind power tower cabin

Abstract

The utility model relates to an inflatable transformer for an offshore wind power tower cabin, and belongs to the technical field of transformer manufacturing. According to the technical scheme, gas is adopted as an insulating and cooling medium in a gas tank of the transformer, and the exterior of the transformer is composed of a high-voltage wire outlet system, a low-voltage wire outlet system, a cooling system, a pressure protection gas injection, deflation and taking system, a temperature measurement system and a burst pressure protection system; the cooling system adopts a strong gas water cooling mode; the transformer is provided with a burst pressure relay, a pressure density protection meter and a thermometer to monitor and protect a transformer body. The inflatable transformer has the positive effects that the transformer takes gas as a transformer cooling and insulating medium and has the characteristics of non-combustibility and non-explosion, so that safety accidents caused by transformer faults are completely avoided, the transformer is safer and more reliable to use, the inflatable transformer is used in an offshore wind power tower cabin, and the service life of the transformer is prolonged. The danger of fire catching and explosion caused by faults of the transformer can be thoroughly avoided, and the operation safety of offshore wind power tower drum equipment is guaranteed.

Description

Technical Field

[0001] The utility model relates to an inflatable transformer for an offshore wind power tower cabin, belonging to the technical field of transformer manufacturing. Background Art

[0002] Wind turbine equipment is expensive to build, especially when built offshore. It's often unmanned, making it difficult to address safety issues like fire or explosion in a timely manner. To improve the safety of offshore wind turbine towers, existing offshore wind turbine tower nacelle transformers typically use synthetic ester insulating oil with a higher flash point as the transformer medium. For example, Chinese patents CN202220769493.5, titled "A High-Flash-Point Oil Transformer for Large-Capacity Offshore Wind Turbines," and CN202310614076.2, titled "A Double Oil Conservator Structure for Offshore Wind Turbine Oil-Immersed Transformers," have a relatively high flash point of around 300°C. While this somewhat reduces the risk of fire and improves transformer safety, it's still an ester-based substance and carries the potential for combustion and explosion. Utility Model Content

[0003] The purpose of the utility model is to provide an inflatable transformer for an offshore wind turbine tower nacelle. The transformer uses gas as the transformer cooling and insulation medium, has the characteristics of being non-flammable and non-explosive, completely avoids safety accidents caused by transformer failure, and solves the above-mentioned technical problems existing in the existing technology.

[0004] The technical solution of the utility model is:

[0005] An inflatable transformer for an offshore wind turbine tower nacelle, wherein the transformer body consists of a transformer gas box and a device body, which is installed inside the transformer gas box and contains a transformer core, a coil and a lead. Gas is used as an insulating and cooling medium inside the transformer gas box, and the outside of the transformer consists of a high-voltage outlet system, a low-voltage outlet system, a cooling system, a pressure protection gas injection and release system, a temperature measurement system and a sudden pressure protection system. The high-voltage outlet system has the following structure: the high-voltage side of the transformer is directly connected to the high-voltage cable through a high-voltage elbow connector and a high-voltage lightning arrester and is led out; the low-voltage outlet system has the following structure: the low-voltage side of the transformer is connected to the low-voltage busbar through a bushing and is led out; the cooling system adopts a strong air-water cooling method; the transformer is equipped with a sudden pressure relay, a pressure density protection meter and a thermometer to monitor and protect the transformer body.

[0006] The gas is one of the following: SF6 gas; C4F7N gas and CO2, N2, O2 mixed gas; C5F 10 O and CO2, N2, O2 mixed gas.

[0007] The cooling system comprises two sets of coolers with the same structure, namely a left cooler and a right cooler. The left cooler comprises a cooling system isolation valve 1, a cooling system isolation valve 2, a cooling system upper connecting pipe 1, a cooling system air-water heat exchanger 1, a cooling system air pump 1, a cooling system lower connecting pipe 1 and a cooling system injection and discharge valve 1. The upper and lower parts of the transformer body are respectively connected to the cooling system air-water heat exchanger 1 through the cooling system upper connecting pipe 1 and the cooling system lower connecting pipe 1. The cooling system upper connecting pipe 1 and the cooling system lower connecting pipe 1 are respectively provided with a cooling system isolation valve 1 and a cooling system The cooling system isolation valve 2 isolates the transformer body from the cooling system air-water heat exchanger 1, and a cooling system air pump 1 is provided on the cooling system lower connecting pipe 1; the cooling system lower connecting pipe 1 is provided with a cooling system injection and discharge valve 1, and the cooling system injection and discharge valve 1 is used for separate vacuuming and gas injection operations of the gas inside the cooling system; the right cooler includes a cooling system isolation valve 3, a cooling system isolation valve 4, a cooling system upper connecting pipe 2, a cooling system air-water heat exchanger 2, a cooling system air pump 2, a cooling system lower connecting pipe 2 and a cooling system injection and discharge valve 2, and has the same functions as the left cooler.

[0008] The pressure protection injection and release gas extraction system consists of a pressure and density protection gauge, a body injection and release gas isolation valve, a body injection and release gas pipeline and a body injection and release gas valve arranged on the transformer body, which can monitor the gas pressure and density inside the transformer and meet the requirements of replacement and inspection of the pressure and density protection gauge.

[0009] The temperature measurement system is composed of a thermometer probe, a thermometer capillary and a thermometer terminal arranged on the transformer body, which realizes real-time monitoring of the gas temperature on the top of the transformer to ensure the operating status of the transformer.

[0010] The sudden pressure protection system consists of a sudden pressure relay, a sudden pressure relay connecting pipe and a sudden pressure relay isolation valve arranged on the transformer body. The sudden pressure relay is arranged on the transformer body through the sudden pressure relay connecting pipe, and the sudden pressure relay isolation valve is arranged on the sudden pressure relay connecting pipe to realize monitoring of internal faults of the transformer.

[0011] When the transformer is in normal operation, the main body injection and discharge isolation valve is in a normally open state, the main body injection and discharge valve is in a normally closed state, the main body injection and discharge pipeline is connected to the gas path of the transformer body, and the gas pressure and density of the transformer gas chamber are monitored by the pressure density protection meter connected to the main body injection and discharge pipeline. Once there is leakage, an alarm or trip signal is issued when the gas density drops to a certain level. When the gas pressure increases to a certain level, a high pressure alarm signal is also issued. The gas inside the transformer body can be sampled and analyzed through the main body injection and discharge valve to determine the internal operating status of the transformer. When the transformer needs to be repaired, When the transformer is under maintenance, the gas inside the transformer body can be recovered through the main body injection and discharge valve. After the maintenance is completed, the transformer can be vacuumed and gas-injected through the main body injection and discharge valve. When the pressure density protection gauge fails or needs to be disassembled for calibration, the main body injection and discharge isolation valve can be closed, and a small amount of gas in the main body injection and discharge pipeline can be recovered through the main body injection and discharge valve. Then the pressure density protection gauge can be removed, and the pressure density protection gauge can be replaced or reinstalled after calibration. The main body injection and discharge pipeline can be vacuumed and gas-injected, the main body injection and discharge valve can be closed, and the main body injection and discharge isolation valve can be opened to put the transformer into normal operation.

[0012] The transformer temperature measurement system is composed of a thermometer probe, a thermometer capillary and a thermometer terminal. The thermometer probe is inserted into the transformer body from the top to detect the temperature of the gas on the top of the transformer. The thermometer capillary connects the thermometer probe and the thermometer terminal, and transmits the temperature of the top gas of the transformer detected by the thermometer probe to the thermometer terminal for intuitive display. When the temperature of the gas on the top of the transformer is too high, the thermometer terminal will send an alarm signal.

[0013] The sudden pressure protection system consists of a sudden pressure relay, a sudden pressure relay connecting pipe and a sudden pressure relay isolation valve. When the transformer is operating normally, the sudden pressure relay isolation valve is in the normally open state. When there is a fault inside the transformer, the sudden pressure relay sends a trip signal. When the sudden pressure relay is replaced, the sudden pressure relay isolation valve can be closed and then opened again to enter normal operation after the replacement is completed.

[0014] The positive effects of this utility model are as follows: the transformer uses gas as the transformer cooling and insulation medium, which has the characteristics of being non-flammable and non-explosive, completely avoiding safety accidents caused by transformer failure, making the use of the transformer safer and more reliable. The inflatable transformer is used in the offshore wind power tower nacelle, which can completely avoid the risk of fire and explosion caused by transformer failure, and ensure the safe operation of offshore wind power tower equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front view of a transformer according to an embodiment of the present utility model;

[0016] Figure 2 This is a top view of a transformer according to an embodiment of the present utility model;

[0017] Figure 3 This is a side view of a transformer according to an embodiment of the present utility model;

[0018] Figure 4 A three-dimensional view of a transformer according to an embodiment of the present utility model;

[0019] In the figure: transformer body 1; low-voltage bushing 1 21, low-voltage bushing 2 22, low-voltage bushing 3 23, low-voltage bushing 4 24; high-voltage elbow coupler 1 31, high-voltage elbow coupler 2 32, high-voltage elbow coupler 3 33; high-voltage lightning arrester 1 41, high-voltage lightning arrester 2 42, high-voltage lightning arrester 3 43; cooling system isolation valve 1 51, cooling system isolation valve 2 56, cooling system isolation valve 3 61, cooling system isolation valve 4 66; cooling system upper connecting pipe 1 52, cooling system upper connecting pipe 2 62; cooling system air-water heat exchanger 1 53, cooling system air-water heat exchanger Heat exchanger 2 63; cooling system air pump 1 54, cooling system air pump 2 64; cooling system lower connecting pipe 1 55, cooling system lower connecting pipe 2 65; cooling system injection and discharge valve 1 57, cooling system injection and discharge valve 2 67; pressure density protection gauge 71; main body injection and discharge isolation valve 72; main body injection and discharge pipeline 73; main body injection and discharge valve 74; thermometer probe 81; thermometer capillary 82; thermometer terminal 83; sudden pressure relay 91; sudden pressure relay connecting pipe 92; sudden pressure relay isolation valve 93; PLC programmable intelligent terminal control box 10. DETAILED DESCRIPTION

[0020] The present invention will be further described below through embodiments with reference to the accompanying drawings.

[0021] An inflatable transformer for an offshore wind turbine tower nacelle, wherein the transformer body 1 consists of a transformer gas box and a device body, which is installed inside the transformer gas box and contains a transformer core, a coil and a lead. Gas is used as an insulating and cooling medium inside the transformer gas box, and the outside of the transformer consists of a high-voltage outlet system, a low-voltage outlet system, a cooling system, a pressure protection gas injection and release system, a temperature measurement system and a sudden pressure protection system. The high-voltage outlet system has the following structure: the high-voltage side of the transformer is directly connected to the high-voltage cable through a high-voltage elbow connector and a high-voltage lightning arrester and is led out; the low-voltage outlet system has the following structure: the low-voltage side of the transformer is connected to the low-voltage busbar through a bushing and is led out; the cooling system adopts a strong air-water cooling method; the transformer is equipped with a sudden pressure relay, a pressure density protection meter and a thermometer to monitor and protect the transformer body.

[0022] The gas is one of the following: SF6 gas; C4F7N gas and CO2, N2, O2 mixed gas; C5F 10O and CO2, N2, O2 mixed gas.

[0023] The cooling system comprises two sets of coolers with the same structure, namely a left cooler and a right cooler. The left cooler comprises a cooling system isolation valve 51, a cooling system isolation valve 2 56, a cooling system upper connecting pipe 52, a cooling system air-water heat exchanger 53, a cooling system air pump 54, a cooling system lower connecting pipe 55 and a cooling system injection and discharge valve 57. The upper and lower parts of the transformer body 1 are connected to the cooling system air-water heat exchanger 53 through the cooling system upper connecting pipe 52 and the cooling system lower connecting pipe 55 respectively. The cooling system upper connecting pipe 52 and the cooling system lower connecting pipe 55 are respectively provided with a cooling system isolation valve 51 and a cooling system The system isolation valve 2 56 isolates the transformer body 1 from the cooling system air-water heat exchanger 1 53. A cooling system air pump 1 54 is provided on the cooling system lower connecting pipe 1 55; the cooling system lower connecting pipe 1 55 is provided with a cooling system injection and discharge valve 1 57, and the cooling system injection and discharge valve 1 57 is used for separate vacuuming and gas injection operations of the gas inside the cooling system; the right cooler includes a cooling system isolation valve 3 61, a cooling system isolation valve 4 66, a cooling system upper connecting pipe 2 62, a cooling system air-water heat exchanger 2 63, a cooling system air pump 2 64, a cooling system lower connecting pipe 2 65 and a cooling system injection and discharge valve 2 67, which has the same functions as the left cooler.

[0024] The pressure protection injection and release gas extraction system is composed of a pressure density protection gauge 71, a body injection and release gas isolation valve 72, a body injection and release gas pipeline 73 and a body injection and release gas valve 74 arranged on the transformer body 1, which can monitor the gas pressure and density inside the transformer and meet the requirements of replacement and inspection of the pressure density protection gauge.

[0025] The temperature measurement system is composed of a thermometer probe 81, a thermometer capillary 82 and a thermometer terminal 83 arranged on the transformer body 1, which realizes real-time monitoring of the gas temperature at the top of the transformer to ensure the operating status of the transformer.

[0026] The sudden pressure protection system is composed of a sudden pressure relay 91, a sudden pressure relay connecting pipe 92 and a sudden pressure relay isolation valve 93 arranged on the transformer body 1. The sudden pressure relay 91 is arranged on the transformer body 1 through the sudden pressure relay connecting pipe 92, and the sudden pressure relay isolation valve 93 is arranged on the sudden pressure relay connecting pipe 92 to realize the monitoring of internal faults of the transformer.

[0027] The transformer is also equipped with an intelligent control system, which uses a PLC programmable intelligent control box to achieve intelligent control and protection of the cooling system. The intelligent control system installs the PLC programmable intelligent control in a PLC programmable intelligent terminal control box 10. The PLC programmable intelligent terminal control box 10 can intelligently control the start and stop of the air pump of the transformer cooling system. At the same time, the transformer secondary protection terminals are centralized in the terminal control box for user use, realizing intelligent control of the transformer cooling system.

[0028] In this embodiment, the transformer body 1 is composed of a transformer gas box, a transformer body (a transformer core, a coil, a lead wire, etc. installed inside the transformer gas box), and gas (the transformer gas box is filled with SF6 gas).

[0029] In an embodiment, the coil inside the transformer body 1 includes a low-voltage coil and a high-voltage coil. The low-voltage coil inside the transformer body 1 is connected to the parts of the low-voltage bushing 1 21, the low-voltage bushing 2 22, the low-voltage bushing 3 23 and the low-voltage bushing 4 24 inside the transformer through leads. The connection output of the live part of the transformer is realized through the low-voltage bushing 1 21, the low-voltage bushing 2 22, the low-voltage bushing 3 23 and the low-voltage bushing 4 24, while satisfying the isolation between the inside of the transformer body and the external atmosphere. The high-voltage coil inside the transformer body 1 is connected to the high-voltage elbow coupler 1 31, the high-voltage elbow coupler 2 32, and the high-voltage elbow coupler 3 33 through leads, and is connected to the high-voltage lightning arrester 1 41, the high-voltage lightning arrester 2 42, and the high-voltage lightning arrester 3 43 inside the transformer. Finally, the high-voltage cable is connected through the high-voltage elbow coupler 1 31, the high-voltage elbow coupler 2 32, and the high-voltage elbow coupler 3 33 to achieve the connection output of the live part of the transformer, while satisfying the isolation between the internal body of the transformer and the external atmosphere. The low-voltage bushing, the high-voltage elbow coupler, and the high-voltage lightning arrester are all well-known and commonly used components in the art.

[0030] In the embodiment, the cooling system comprises two sets of coolers with the same structure, namely a left cooler and a right cooler. The left cooler comprises a cooling system isolation valve 51, a cooling system isolation valve 2 56, a cooling system upper connecting pipe 52, a cooling system air-water heat exchanger 53, a cooling system air pump 54, a cooling system lower connecting pipe 55 and a cooling system injection and discharge valve 57. The upper and lower parts of the transformer body 1 are connected to the cooling system through the cooling system upper connecting pipe 52 and the cooling system lower connecting pipe 55 respectively. The system is connected to the air-water heat exchanger 153, and the upper connecting pipe 152 of the cooling system and the lower connecting pipe 155 of the cooling system are respectively provided with a cooling system isolation valve 151 and a cooling system isolation valve 256 to isolate the transformer body 1 from the air-water heat exchanger 153 of the cooling system. The lower connecting pipe 155 of the cooling system is provided with a cooling system air pump 154; the lower connecting pipe 155 of the cooling system is provided with a cooling system injection and discharge valve 157, and the cooling system injection and discharge valve 157 is used for the separate vacuuming and gas injection operations of the gas inside the cooling system.

[0031] When the transformer is operating normally, the cooling system isolation valve 1 51 and the cooling system isolation valve 2 56 are in a normally open state; when the cooling system air-water heat exchanger 1 53 and the cooling system air pump 1 54 fail or are under maintenance, the cooling system isolation valve 1 51 and the cooling system isolation valve 2 56 are closed. When the gas inside the transformer body 1 does not move, a small amount of gas in the left cooler is recovered through the cooling system injection and release valve 1 57. After the maintenance is completed, vacuum and gas are pumped through the cooling system injection and release valve 1 57. Finally, the cooling system isolation valve 1 51 and the cooling system isolation valve 2 56 are opened, and the transformer is completely restored to normal.

[0032] The right cooler includes cooling system isolation valve 3 61, cooling system isolation valve 4 66, cooling system upper connecting pipe 2 62, cooling system air-water heat exchanger 2 63, cooling system air pump 2 64, cooling system lower connecting pipe 2 65 and cooling system injection and discharge valve 2 67. It has the same functions as the left cooler. Multiple groups of coolers with the same structure can be installed according to the capacity of the transformer.

[0033] In this embodiment, a pressure protection, injection and discharge gas extraction system is formed by a pressure density protection gauge 71, a main body injection and discharge gas isolation valve 72, a main body injection and discharge gas pipeline 73 and a main body injection and discharge gas valve 74 to perform pressure protection, injection and discharge gas, and gas extraction on the transformer. When the transformer is in normal operation, the main body injection and discharge gas isolation valve 72 is in a normally open state, the main body injection and discharge gas valve 74 is in a normally closed state, the main body injection and discharge gas pipeline 73 is connected to the gas path of the transformer body, and the gas pressure and density of the transformer gas chamber are monitored by the pressure density protection gauge 71 connected to the main body injection and discharge gas pipeline 73. Once there is a leakage, an alarm or trip signal is issued when the gas density drops to a certain level, and a high pressure alarm signal is also issued when the gas pressure increases to a certain level; the transformer can be monitored by the main body injection and discharge gas valve 74 The gas inside the transformer body is sampled and analyzed to determine the operating status inside the transformer; when the transformer needs to be repaired, the gas inside the transformer body can be recovered through the body injection and discharge valve 74, and when the repair is completed, the transformer is vacuumed and gas-injected through the body injection and discharge valve 74; when the pressure density protection gauge 71 fails or needs to be disassembled for calibration, the body injection and discharge isolation valve 72 can be closed, and a small amount of gas in the body injection and discharge pipeline 73 can be recovered through the body injection and discharge valve 74, and then the pressure density protection gauge 71 can be removed, and the pressure density protection gauge 71 can be replaced or reinstalled after calibration, and the body injection and discharge pipeline 73 can be vacuumed and gas-injected, the body injection and discharge valve 74 can be closed, and the body injection and discharge isolation valve 72 can be opened to put the transformer into normal operating state.

[0034] In this embodiment, a transformer temperature measurement system is comprised of a thermometer probe 81, a thermometer capillary 82, and a thermometer terminal 83. The thermometer probe 81 is inserted into the transformer body 1 from the top thereof to detect the temperature of the gas at the top of the transformer. The thermometer capillary 82 connects the thermometer probe 81 and the thermometer terminal 83, transmitting the temperature of the gas at the top of the transformer detected by the thermometer probe 81 to the thermometer terminal 83 for intuitive display. When the temperature of the gas at the top of the transformer is too high, the thermometer terminal 83 issues an alarm signal.

[0035] In this embodiment, a sudden pressure protection system is composed of a sudden pressure relay 91, a sudden pressure relay connecting pipe 92 and a sudden pressure relay isolation valve 93. When the transformer is operating normally, the sudden pressure relay isolation valve 93 is in a normally open state. When there is a fault inside the transformer, the sudden pressure relay sends a trip signal; when the sudden pressure relay is replaced, the sudden pressure relay isolation valve 93 can be closed and then opened again after the replacement is completed to enter normal operation.

[0036] The inflatable transformer for the offshore wind power tower cabin provided by the utility model can completely meet the safety requirements of the use environment.

Claims

1. An inflatable transformer for an offshore wind turbine tower nacelle, characterized by: The transformer body (1) is composed of a transformer gas box and a device body. The device body is installed inside the transformer gas box and contains a transformer core, a coil and a lead. The inside of the transformer gas box uses gas as an insulation and cooling medium. The outside of the transformer is composed of a high-voltage outlet system, a low-voltage outlet system, a cooling system, a pressure protection gas injection and discharge system, a temperature measurement system and a sudden pressure protection system. The structure of the high-voltage outlet system is as follows: the high-voltage side of the transformer is directly connected to the high-voltage cable through a high-voltage elbow connector and a high-voltage lightning arrester and is led out; the structure of the low-voltage outlet system is as follows: the low-voltage side of the transformer is connected to the low-voltage busbar through a bushing and is led out; the cooling system adopts a strong gas water cooling method; the transformer is equipped with a sudden pressure relay, a pressure density protection meter and a thermometer to monitor and protect the transformer body.

2. The gas-filled transformer for an offshore wind turbine tower nacelle according to claim 1, characterized in that: The gas is one of the following: SF6 gas; C4F7N gas and CO2, N2, O2 mixed gas; C5F 10 O and CO2, N2, O2 mixed gas.

3. The inflatable transformer for an offshore wind turbine tower nacelle according to claim 2, characterized in that: The cooling system comprises two sets of coolers with the same structure, namely a left cooler and a right cooler. The left cooler comprises a cooling system isolation valve (51), a cooling system isolation valve (56), a cooling system upper connecting pipe (52), a cooling system air-water heat exchanger (53), a cooling system air pump (54), a cooling system lower connecting pipe (55) and a cooling system injection and discharge valve (57). The upper and lower parts of the transformer body (1) are connected to the cooling system air-water heat exchanger (53) through the cooling system upper connecting pipe (52) and the cooling system lower connecting pipe (55), respectively. The cooling system upper connecting pipe (52) and the cooling system lower connecting pipe (55) are provided with a cooling system isolation valve (51) and a cooling system. The second isolation valve (56) of the system isolates the transformer body (1) from the first air-water heat exchanger (53) of the cooling system. The first lower connecting pipe (55) of the cooling system is provided with a first cooling system air pump (54). The first lower connecting pipe (55) of the cooling system is provided with a first cooling system air injection and discharge valve (57). The first cooling system air injection and discharge valve (57) is used for the separate vacuuming and air injection operations of the gas inside the cooling system. The right cooler comprises a third cooling system isolation valve (61), a fourth cooling system isolation valve (66), a second upper connecting pipe (62) of the cooling system, a second air-water heat exchanger (63) of the cooling system, a second cooling system air pump (64), a second lower connecting pipe (65) of the cooling system and a second cooling system air injection and discharge valve (67), which has the same functions as the left cooler.

4. The gas-filled transformer for an offshore wind turbine tower nacelle according to claim 1 or 2, characterized in that: The pressure protection injection and release gas extraction system is composed of a pressure density protection gauge (71) arranged on the transformer body (1), a body injection and release gas isolation valve (72), a body injection and release gas pipeline (73), and a body injection and release gas valve (74).

5. The gas-filled transformer for an offshore wind turbine tower nacelle according to claim 1 or 2, characterized in that: The temperature measurement system is composed of a thermometer probe (81), a thermometer capillary (82), and a thermometer terminal (83) arranged on the transformer body (1).

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