Method for cleaning generator of wind turbine

Abstract

The invention relates to a method (100) for cleaning a generator (200) of a wind turbine (1), where the wind turbine (1) comprises a tower (12), a nacelle (207) rotatably mounted to the tower (12), a wind turbine rotor (217) having at least one rotor blade, and a generator (200) drivable by the rotor (217), the wind turbine rotor (217) is rotatably mounted to the nacelle (207) about a substantially horizontal axis of rotation (218). The method comprises the steps of: locking (101) the wind turbine rotor (217); turning off (103) the generator (200); removing the cooling device (211) such that the opening (204) is accessible for maintenance purposes; inserting (105) a cleaning agent into the opening (204) such that the cleaning agent is at least partially in operative contact with the winding (202) and / or with the magnetic element (214); at least partially removing (107) the cleaning agent from the generator (200); mounting the cooling device (211) to the opening (204); and releasing (109) the wind turbine rotor (217).

Description

Technical Field

[0001] The invention relates to a method for cleaning a generator of a wind turbine, a method for operating a wind turbine, a wind turbine and the use of a cleaning agent for cleaning a wind turbine. Background Art

[0002] Generators in wind turbines face grease leakage problems caused by the main bearings of the generator. Grease leaking from the main bearing seals enters the generator, which cannot be reached by cleaning equipment because the space inside the generator housing is very limited.

[0003] In this context, the problem underlying the present invention is to provide a possibility for cleaning a generator, in particular a stator winding of a generator in a wind turbine, to remove grease. Summary of the invention

[0004] According to one aspect, a wind turbine with a generator to be cleaned comprises a tower, a nacelle rotatably mounted to the tower, a wind turbine rotor with at least one rotor blade rotatably mounted to the nacelle about a substantially horizontal axis of rotation, and a generator drivable by the wind turbine rotor.

[0005] According to one embodiment, the generator comprises a fixed housing and a rotating housing, a generator rotor with magnetic elements, a stator with windings and a cooling device attached to an opening of the fixed housing. In particular, according to this embodiment, the stator is surrounded or surrounded by the generator rotor, wherein the stator is equipped with a plurality of windings. The generator rotor is rotatably connected to the wind turbine rotor so that the rotation of the wind turbine rotor is transmitted to the generator rotor. In particular, the rotating housing of the generator is rotatably connected to the wind turbine rotor while supporting a plurality of magnetic elements on the radial inner side. The configuration of the generator rotor and the stator is selected so that there is only a small air gap in the radial direction between the windings of the stator and the magnetic elements of the rotor. In addition, the generator comprises a cooling device, which is attached to an opening of the fixed part of the housing (fixed housing).

[0006] According to another embodiment / aspect, the configuration of the generator may be different, such as such that a rotor of the generator is surrounded by a stator of the generator, and the rotor includes at least one magnetic element, wherein the stator includes at least one winding.

[0007] If the generator is driven by the wind turbine rotor, a relative translation / rotational movement is generated between the magnetic element and the winding of the generator, thereby inducing a current in the winding.

[0008] According to one aspect, in particular for cleaning a wind turbine having the configuration described, the problem is solved by providing a method for cleaning the generator. The method comprises the following steps: locking the wind turbine rotor and shutting down the generator. Then, the cooling device is removed so that the opening in the fixed housing is accessible for maintenance purposes. By providing access to the opening, the following steps can be performed without having to form an additional opening in the housing of the generator, thereby causing structural damage to the generator. Subsequently, an excess of cleaning agent is inserted or poured into the opening so that the cleaning agent is at least partially in effective contact with the winding and / or with the magnetic element. The cleaning agent then begins to act on dirt, grease or other substances that are not desired to be present on the surface of a part of the generator, in particular on the sensible winding of the stator. Thereafter, the cleaning agent is removed from the interior of the generator. Now, the cooling device is mounted again on the opening of the housing, thereby closing the housing. The wind turbine can now resume its operation after the wind turbine rotor has been released.

[0009] By implementing the method as described above, a serious technical prejudice has been overcome for the first time, namely, the insertion of cleaning agents into the internal volume of a generator. Normally, technicians would avoid inserting cleaning agents into the internal volume of a generator due to the presence of highly sensitive surfaces, such as the surfaces of the windings of the stator. By performing a large series of careful tests and experiments, the inventive engineers determined a unique solution, namely that a specific cleaning agent with a unique composition is actually suitable, contrary to all understandings of the prior art. Surprisingly, it has been found that inserting a cleaning agent into the generator is successful for removing dirt or grease from the surface of the stator or the generator rotor, wherein the cleaning agent is or includes a grease remover, and wherein the grease remover is non-water-soluble and is a fluid liquid, so that the generator of a wind turbine can be partially rinsed with the grease remover, the grease remover having a viscosity greater than 0.6 g / cm 3 And less than 0.85g / cm 3 The density is greater than 1.3mm 2 / s and less than 2.5mm 2 / s kinematic viscosity, and includes normal paraffins and hydrocarbons.

[0010] Since most of the tested cleaning agents were shown to be unsuitable, ineffective or even harmful to the components of the generator, the identification of the suitability of a specific cleaning agent requires a significant investment in research and development.Exclusively, cleaning agents having the above mentioned properties successfully meet the various application requirements.

[0011] The term "effective contact" may be understood such that physical contact between the cleaning agent and the surface (which may be partially covered with dirt, grease or other substances undesirably present on the surface of the segment) is achieved and the cleaning, solving and removing effects of the cleaning agent can occur.

[0012] The cleaning agent may remain in effective contact with the respective section or may remain within the generator for a given cleaning time in order to be effective. The given cleaning time is defined as between the moment of first application of the cleaning agent and the start of the removal step. The given cleaning time is at least three minutes, preferably at least five minutes, more preferably at least 10 minutes, even further preferably at least 15 minutes, and / or not more than 60 minutes, preferably not more than 30 minutes, more preferably not more than 20 minutes.

[0013] Furthermore, the cleaning agent may be inserted into the generator or onto surfaces of the internal volume of the generator such that the kinetic energy of the spray of cleaning agent is used to properly distribute the cleaning agent over a large portion of the relevant surfaces, in particular over the windings of the stator.

[0014] Additionally or alternatively, the cleaning agent can be inserted into the generator or onto the corresponding surface by using an injection device for inserting the cleaning agent, which is configured so that a sharp and compact injection, compaction of the cleaning agent can be provided. The term "sharp and compact injection" can be understood as such that the injection has an injection angle of not more than 90°, preferably not more than 70°, more preferably not more than 45°, and even more preferably not more than 20°. In particular, the sharp and compact injection is configured so that both are achieved, i.e., covering a wider surface to be cleaned and applying a certain kinetic energy to the injected cleaning agent.

[0015] As a next subsequent step, the contaminated cleaning agent is removed from the generator. This means that at least a large part of the cleaning agent is carried away from the corresponding surfaces of the internal volume of the generator, is removed from the interior of the generator, and / or is sucked out of the internal volume of the generator, so that the normal standard function of the generator can be restored. This means that a certain amount of residual cleaning agent that does not negatively affect the functionality of the generator may remain in the interior of the generator, so that even after the step of removing the cleaning agent from the generator is implemented, a test for the presence of residual cleaning agent is positive. In particular, the step of removing the cleaning agent may include: removing at least 80%, preferably at least 90%, more preferably at least 95%, even more preferably at least 97%, or even more preferably at least 99% of the cleaning agent initially provided from the interior of the generator. The state (i.e., the cleaning agent is at least partially removed) can be determined as "the generator is cleaned".

[0016] In a next step, the rotor is released from the temporary rotor lock so as to be able to rotate. The rotor is then rotated so that another part of the generator rotor can be cleaned. The cleaning of the other part comprises: locking the rotor again; inserting a cleaning agent into the generator or the housing so that the cleaning agent is at least partially in effective contact with the other part; and removing or at least partially removing the cleaning agent from the other part of the generator. This cleaning process can be continued and / or repeated until the entire generator (e.g., all parts of the generator rotor) are cleaned.

[0017] In the context of the present disclosure, shutting down the generator may include disconnecting the electrical connection by tripping / opening a circuit breaker between the generator and the rest of the turbine, so that the generator has no power. Thus, starting the generator may include connecting the electrical connection by closing the open circuit breaker between the generator and the wind turbine, so that the generator produces electrical energy, i.e., converts wind energy into electrical energy.

[0018] In order to shut down the generator, the generator can be put into the so-called LOTO state.

[0019] In the context of this disclosure, idling or moving the rotor of a wind turbine means orbiting the rotor a certain distance without generating electrical energy, such as the length of a section around a generator. Thus, the rotor may move a distance equal to 360° divided by the number of sections of the rotor.

[0020] In the context of the present disclosure, locking the rotor of a wind turbine prevents the rotor from moving. For example, such locking may be caused by blocking a gear connected to the rotor or by engaging a brake connected to the rotor.

[0021] Thus, the cleaning agent may be supplied into the generator at a first point within the generator and removed at a second point within the generator, wherein the first point is higher than the second point in the direction of gravity. Alternatively or additionally, a vacuum pump may be used to remove the cleaning agent from the section. Thus, by using gravity and / or vacuum, a force is applied to force the cleaning agent through the section such that the cleaning agent comes into contact with grease accumulated inside the generator, dissolves the grease, absorbs the grease and transports it out of the generator.

[0022] In particular, the use of a vacuum allows the cleaning agent to be almost completely removed from the generator, thereby preventing the cleaning agent from being released into the environment.

[0023] The cleaning process can be repeated on another portion of the generator rotor by moving the rotor and / or the generator. To move the rotor, the brakes on the rotor are released, allowing the rotor to rotate, for example using gravity and / or wind energy. Alternatively, a motor or the muscle power of a technician can be used to move the rotor.

[0024] According to one embodiment, the rotor is moved in at least one direction before the cleaning agent is removed or at least partially removed from the section of the generator.

[0025] It has been found that moving the rotor (especially idling) causes the generator to move inside the generator together with the cleaning agent. This movement creates mechanical stress between the cleaning agent and the generator, which results in wiping grease from the generator. In particular, this movement pushes the cleaning agent to inaccessible areas of the generator and dilutes the grease so that it flows to more accessible areas.

[0026] The rotor can move for a period of time between 1 second and 12 hours, for example.

[0027] It has surprisingly been found during experiments that a cleaning agent which is in liquid state or at least partially becomes liquid during cleaning does not cause any damage to the generator and also reliably removes grease from the generator.

[0028] In the context of the present invention, it is mentioned that the individual steps of the disclosed methods do not necessarily need to be performed in the order arranged; however, performing the steps in the mentioned order is an advantageous embodiment.

[0029] According to one embodiment, the removed contaminated cleaning agent is analyzed relative to a standard that specifies a contamination level of the cleaning agent, and if the contamination level is greater than a given threshold, the following steps are repeated until the contamination level is less than or equal to the threshold: filling the generator with fresh cleaning agent; and removing the contaminated cleaning agent from the generator.

[0030] The standard of contamination level using a specified cleaning agent provides an objective measure to assess whether the cleaning agent is completely contaminated and needs to be changed, or the cleaning agent is not completely contaminated and the generator is clean.

[0031] For example, analyzing the cleaning agent relative to a standard specifying the cleaning agent's contamination level may include optical inspection by eye or by using a spectrometer.

[0032] According to one embodiment, the standard comprises a reference color.

[0033] By using a reference color as a criterion for defining the contamination level of the cleaning agent, contaminated cleaning agent can also be easily and quickly assessed under harsh conditions, such as in the nacelle of a wind turbine. Thus, by comparing the color of the contaminated cleaning agent with the reference color, the state of the contaminated cleaning agent and, therefore, the state of the generator can be easily assessed.

[0034] According to one embodiment, shutting down the generator comprises disconnecting an electrical connection between the generator and the rest of the turbine.

[0035] By disconnecting the electrical connection between the generator and the rest of the turbine, it is ensured that no interaction occurs between the electrical energy in the generator and the cleaning agent which could damage the generator.

[0036] According to one embodiment, the method further comprises: shutting down a cooling system for cooling the generator before filling fresh cleaning agent into the generator; and starting the cooling system to dry the generator to remove the cleaning agent before starting the generator.

[0037] Since the cooling system (such as, for example, a plurality of fans) is electrically driven, the cooling system should be shut down, in particular put into a LOTO state, to ensure that no electricity is introduced from the cooling system into the cleaning agent.

[0038] By starting the cooling system before starting the generator, the air flow provided by the cooling system can be used to dry the generator to remove residual cleaning agent inside the generator. Since the cooling system only provides a small amount of heat, the generator will not be critically preheated.

[0039] According to one embodiment, removing the contaminated cleaning agent from the generator comprises: lowering a suction hose into a housing of the generator; and sucking out the contaminated cleaning agent using a pump.

[0040] By using a hose, the hose can be lowered to the point where the grease has accumulated, such as, for example, the lowest point in the generator. Of course, multiple points inside the generator can be used to suck out the contaminated cleaning agent.

[0041] A pump may be used to suck out the contaminated cleaning agent, such as a pump driven by a drill, which is easy to operate and may be driven by electricity from a battery.

[0042] According to one embodiment, fresh cleaning agent is filled into the generator through an opening in a stationary housing of the generator.

[0043] By using an opening from inside the nacelle of the wind turbine to fill the cleaning agent into the generator, dangerous operations outside the nacelle can be avoided.The opening may be a hatch for maintenance of the generator.

[0044] According to one embodiment, the volume of the cleaning agent filled in the generator is between 10 liters and 200 liters, in particular between 15 liters and 100 liters, preferably between 20 liters and 80 liters, most preferably between 30 liters and 50 liters.

[0045] During experiments it has surprisingly been found that a volume of cleaning agent filled in the generator of between 30 liters and 50 liters, in particular 40 liters, leads to the best cleaning results.

[0046] According to one embodiment, the method further comprises measuring the voltage at the generator, wherein filling the generator with fresh cleaning agent is performed only if the measured voltage is below a given threshold value, in particular zero.

[0047] By measuring the voltage at the generator upon completion of the cleaning process and dry application, a short circuit in the generator caused by cleaning agents filled into the generator is prevented.

[0048] Additionally and / or alternatively, another aspect and / or an embodiment in particular being one of the aforementioned aspects and / or embodiments is disclosed, namely a method for operating a wind turbine, in particular an offshore wind turbine, further in particular a floating offshore wind turbine, and / or for feeding electrical and / or chemical energy into an electrical and / or chemical grid, the method comprising the following steps:

[0049] Execute the steps of an embodiment or combination of embodiments of the method disclosed above, and / or operate an embodiment of the apparatus disclosed above,

[0050] generating electricity and / or electrical energy by means of a wind turbine, and in particular generating chemical energy in gaseous or liquid form, in particular in the form of hydrogen, at least partly from the electrical energy, further in particular by converting the electrical energy into hydrogen by electrolysis,

[0051] At least partially transmitting the electricity, the electrical energy and / or the chemical energy to an energy receiving device, in particular wherein the receiving device is not located in an international sea, is located on shore and / or is located within a 12-mile zone of a respective host country over which the respective host country has jurisdiction, and at least partially supplying the electricity, the electrical energy and / or the chemical energy to an electrical and / or chemical utility grid, in particular to an onshore electrical and / or chemical utility grid and / or a chemical / electrical storage device.

[0052] The term "chemical energy" includes devices for storing energy in chemical substances, such as hydrogen. A chemical energy grid may be, for example, a gas (hydrogen) grid and / or a storage device.

[0053] According to a third aspect, the invention relates to the use of a cleaning fluid, in particular a grease remover, for cleaning a wind turbine, in particular a generator of a wind turbine.

[0054] It has surprisingly been found that cleaning fluids, in particular large amounts of cleaning fluids, such as grease removers, can be used to clean generators in wind turbines.

[0055] According to a fourth aspect, the present invention relates to a wind turbine for generating electrical energy, the wind turbine comprising a tower, a nacelle and / or a bed frame rotatably mounted to the tower, a rotor having at least one rotor blade, and a generator drivable by the rotor, the rotor being rotatably mounted to the nacelle and / or the bed frame about a substantially horizontal axis, wherein the wind turbine is cleaned by an embodiment of the method disclosed herein.

[0056] According to a fifth aspect, the invention relates to a wind turbine for generating electrical energy, the wind turbine comprising a tower, a nacelle and / or a bed frame rotatably mounted to the tower, a rotor having at least one rotor blade, and a generator drivable by the rotor, the rotor being rotatably mounted to the nacelle and / or the bed frame about a substantially horizontal axis, wherein the generator is filled with a cleaning agent having a grease remover, and wherein the grease remover has a relative humidity of more than 0.5 g / cm 3 and / or less than 0.9g / cm 3 density, and / or having a diameter greater than 1.0 mm 2 / s, and / or less than 3.0mm 2 / s kinematic viscosity, and / or wherein the grease remover is water-insoluble and is a fluid liquid such that the generator of the wind turbine can be flushed with the grease remover, the grease remover having a kinematic viscosity of greater than 0.6 g / cm 3 , more preferably greater than 0.7 g / cm 3 , and preferably greater than 0.75 g / cm 3 , and / or less than 0.85g / cm 3 , more preferably less than 0.82 g / cm 3 , and preferably less than 0.8 g / cm 3 A density of, and / or wherein the density is substantially 0.77 g / cm 3 , with a diameter greater than 1.3 mm 2 / s, more preferably greater than 1.5 mm 2 / s, preferably greater than 1.8 mm 2 / s, and / or less than 2.5mm 2 / s, more preferably less than 2.0 mm 2 / s, preferably less than 1.9 mm 2 / s kinematic viscosity, and / or wherein the kinematic viscosity is substantially 1.88 mm 2 / s, and / or include normal alkanes, hydrocarbons, aliphatic hydrocarbons, mechanical components (such as abrasives) and chemical components (such as bipolar chains), and / or adhesives. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The foregoing and other features and advantages of the present invention will become more apparent from the following detailed description read in conjunction with the accompanying drawings, in which like reference numerals represent like elements.

[0058] Figure 1 A method for cleaning a generator in a wind turbine according to one embodiment is shown;

[0059] Figure 2 A stator of a generator for a wind turbine is shown, the stator consisting of a plurality of segments;

[0060] Figure 3 The details are shown according to Figure 1 a segment of a stator;

[0061] Figure 4 A nacelle of a wind turbine with a generator is shown. DETAILED DESCRIPTION

[0062] Figure 1 A method 100 for cleaning a generator in a wind turbine is shown.

[0063] The method 100 comprises: a locking step 101, in which the rotor of the wind turbine is locked; a shutting down step 103, in which the generator is shut down; a filling step 105, in which fresh cleaning agent is filled into a section of the generator; a removal step 107, in which the cleaning agent is removed or at least partially removed from a section of the generator; a releasing step 109, in which the rotor is released; a moving step 111, in which the rotor is locked again; a removing step 113, in which the contaminated cleaning agent is removed from the generator; a second releasing step 115, in which the rotor is released again; and a starting step 117, in which the generator is started.

[0064] The method 100 further comprises continuing by cleaning another part of the generator rotor, wherein cleaning another section comprises: a locking step 113, wherein the rotor is locked again; an inserting step 115, wherein a cleaning agent is filled into the generator; and a removing step 117, wherein the cleaning agent is removed or at least partially removed from the generator.

[0065] Optionally, method 100 comprises an analysis step 119 , wherein the removed and contaminated cleaning agent is analyzed relative to a standard defining a contamination level of the cleaning agent, and in case the contamination level is greater than a given threshold, filling step 105 and removing step 107 are repeated until the contamination level is less than or equal to the threshold.

[0066] Figure 2 A stator 201 for a generator of a wind turbine is shown, comprising a plurality of parts 203 .

[0067] In an exemplary wind turbine ( Figure 4 ), a nacelle 207 is equipped with a generator 200, wherein a wind turbine rotor 217 of the wind turbine 1 is rotatably supported by the nacelle 207, so that the rotatable part of the generator 200 can be rotated by the wind turbine rotor 217. In an exemplary case, the rotatable part of the generator 200 is referred to as a generator rotor 213 of the generator 200, wherein the non-rotating part of the generator 200 can be referred to as a stator 201. It is obvious to a person skilled in the art that the use of the terms "stator" and "rotor of the generator" should not limit the scope of the present invention. In particular, any alternative configuration of a generator having a rotatable generator rotor and a non-rotating stator is included within the scope of the present invention.

[0068] According to this embodiment, the generator rotor 213 comprises a rotating part of a housing (rotating housing 216) and a magnetic element 214. Both are connected to rotate with a wind turbine rotor 217.

[0069] According to the exemplary wind turbine, the housing of the rotor 217 of the wind turbine (or the hub of the rotor 217) also surrounds the generator 200, thereby also forming the housing of the generator 200. Specifically, the housing of the generator 200 includes a stationary housing 203, which is mainly located on the axial side of the generator adjacent to the nacelle 207. The stationary housing 203 includes an opening 204. An immersed cooling device 211 is mounted on the opening 204, so that, for example, air from the inside of the nacelle 207 can be blown into the inner volume of the generator 200 by the cooling device.

[0070] Opening 204 is identified as a suitable entry point for searching cleaning agent into generator 200 .

[0071] Since the space between the stator 201 and the extraction housing of the generator 200 is very small (5 to 8 mm), a cleaning device (such as a brush) cannot reach the winding 202 of the stator 201 .

[0072] exist Figure 3 , a section 205 of a stator 201 is shown in detail. This section 205 comprises a plurality of windings 202, which are difficult to access by mechanical equipment. Therefore, it is difficult to clean the section 205.

[0073] Furthermore, during operation of the wind turbine, grease from the bearings of the wind turbine accumulates between the windings, causing both thermal and electrical problems.

[0074] exist Figure 4 In FIG. 2 , a nacelle 207 of a wind turbine is shown. The nacelle 207 comprises a rear end 209 in which auxiliary units such as a cooling system 211 are located, a rotor 217 of the wind turbine forming a rotating housing 216 of a rotor 213 of a generator 200 comprising a stator 201 .

[0075] The circle 215 marks the volume between the stator 201 and the housing of the generator rotor 213 , which volume cannot be reached by cleaning equipment from outside the generator 200 .

[0076] Although specific embodiments are disclosed herein, various changes and modifications may be made without departing from the scope of the invention. The embodiments of the present invention should be considered in all aspects as illustrative and not restrictive, and all changes falling within the meaning and equivalent range of the appended claims are intended to be included therein.

[0077] Reference numerals list

[0078] 1. Wind Turbines

[0079] 200 Generator

[0080] 201 Stator

[0081] 202 Winding

[0082] 203 Fixed housing

[0083] 204 Opening

[0084] 205 Segment

[0085] 207 Cabin

[0086] 209 Backend

[0087] 211 Cooling device

[0088] 213 Generator rotor

[0089] 214 Magnetic Components

[0090] 215 round

[0091] 216 Rotating Shell

[0092] 217 Wind turbine rotor

[0093] 218 Horizontal rotation axis

Claims

1. A method (100) for cleaning a generator (200) of a wind turbine (1), in, The wind turbine (1) comprises a tower (12), a nacelle (207) rotatably mounted to the tower (12), a wind turbine rotor (217) having at least one rotor blade, the wind turbine rotor (217) being rotatably mounted to the nacelle (207) about a substantially horizontal rotation axis (218), and a generator (200) drivable by the rotor (217), The generator (200) comprises a fixed housing (203) and a rotating housing (215), a generator rotor (213) having a magnetic element (214), a stator (201) having a winding (202), and a cooling device (211) attached to an opening (204) of the fixed housing (203). The method (100) comprises: Locking (101) the wind turbine rotor (217) and shutting down (103) the generator (200); removing the cooling device (211) so that the opening (204) is accessible for maintenance purposes; inserting (105) a cleaning agent into the opening (204) so ​​that the cleaning agent is at least partially in effective contact with the winding (202) and / or with the magnetic element (214); at least partially removing (107) the cleaning agent from the generator (200); installing the cooling device (211) to the opening (204); and releasing (109) the wind turbine rotor (217), wherein the cleaning agent is or contains a grease remover, and wherein the grease remover is water-insoluble and is a fluid liquid such that the generator (200) of the wind turbine (1) can be partially rinsed with the grease remover, the grease remover having a viscosity greater than 0.6 g / cm 3 And less than 0.85g / cm 3 The density is greater than 1.3mm 2 / s and less than 2.5mm 2 / s kinematic viscosity, and includes normal paraffins and hydrocarbons.

2. The method according to claim 1, in, The grease remover has the following density: The density is greater than 0.7 g / cm 3 , more preferably greater than 0.75 g / cm 3 , and less than 0.82g / cm 3 , and more preferably less than 0.8 g / cm 3 ,or The density is substantially 0.77 g / cm 3 , And wherein the grease remover has the following kinematic viscosity: The kinematic viscosity is greater than 1.5 mm 2 / s, preferably greater than 1.8mm 2 / s, and less than 2.5mm 2 / s, more preferably less than 2.0 mm 2 / s, more preferably less than 1.9 mm 2 / s, or The kinematic viscosity is basically 1.88 mm 2 / s.

3. The method (100) according to any one of the preceding claims, in, analyzing (119) the removed cleaning agent relative to a standard that specifies a contamination level for the cleaning agent; and When the pollution level is greater than a given threshold, repeat the following steps until the pollution level is less than or equal to the threshold: inserting (105) a cleaning agent into the opening (204) so ​​that the cleaning agent is at least partially in effective contact with the winding (202) and / or with the magnetic element (214); The cleaning agent is at least partially removed (107) from the generator (200).

4. The method (100) according to claim 3, wherein: The standard includes a reference color.

5. The method (100) according to any one of the preceding claims, wherein: The method (100) further comprises: Before filling the generator (200) with fresh cleaning agent, shutting down a cooling device (211) for cooling the generator (200); and The cooling device (211) is activated before the generator (200) is activated to dry the generator (200) to remove the cleaning agent.

6. The method (100) of any one of the preceding claims, wherein removing (117) the contaminated cleaning agent from the generator (200) comprises: lowering a suction hose into the generator (200); as well as Use a pump to suck out the contaminated cleaning agent.

7. The method (100) according to any one of the preceding claims, wherein: The volume of the cleaning agent filled in the generator (200) is between 10 liters and 50 liters, in particular between 10 liters and 30 liters.

8. The method (100) according to any one of the preceding claims, comprising: measuring a voltage at a generator (200); as well as Therein, filling the generator (200) with fresh cleaning agent is performed only if the measured voltage is below a given threshold and / or is substantially zero volts.

9. A method for operating a wind turbine, in particular an offshore wind turbine, further in particular a floating offshore wind turbine, and / or for feeding electrical energy into a grid, the method comprising the following steps: Cleaning a generator (200) of a wind turbine (1) according to any of the preceding claims; generating electricity and / or electrical energy by the wind turbine (1); at least partially transmitting said electrical power and / or said electrical energy to an energy receiving device, in particular wherein said receiving device is not located in international waters, is located on shore and / or is located within a 12 mile zone under the jurisdiction of a respective state of a respective sovereign state; and Said electricity and / or said electrical energy is at least partially supplied to an onshore utility grid.

10. A wind turbine (1), comprising a tower (12), a nacelle (10) rotatably mounted to the tower (12), a wind turbine rotor (217) having at least one rotor blade, the wind turbine rotor (217) being rotatably mounted to the nacelle (207) about a substantially horizontal axis of rotation (218), and a generator (200) drivable by the wind turbine rotor (217), in, The generator (200) comprises a stationary housing (203) and a rotating housing (215), a generator rotor (213) having a magnetic element (214), a stator (201) having a winding (202), and a cooling device (211) attached to an opening (204) of the stationary housing (203). The generator (200) is cleaned by implementing the cleaning method according to any one of claims 1 to 8.

11. A wind turbine (1), comprising a tower (12), a nacelle (10) rotatably mounted to the tower (12), a wind turbine rotor (217) having at least one rotor blade, the wind turbine rotor (217) being rotatably mounted to the nacelle (207) about a substantially horizontal axis of rotation (218), and a generator (200) drivable by the wind turbine rotor (217), in, The generator (200) comprises a stationary housing (203) and a rotating housing (215), a generator rotor (213) having a magnetic element (214), a stator (201) having a winding (202), and a cooling device (211) attached to an opening (204) of the stationary housing (203). wherein after carrying out the cleaning method according to any one of claims 1 to 8, cleaning agent or residues of cleaning agent are present in the generator (200), and The cleaning agent or cleaning agent residue comprises a grease remover, wherein the grease remover is water-insoluble and is a fluid liquid such that the generator (200) of the wind turbine can be partially rinsed with the grease remover, the grease remover having a viscosity greater than 0.6 g / cm 3 And less than 0.85g / cm 3 The density is greater than 1.3mm 2 / s and less than 2.5mm 2 / s kinematic viscosity, and includes normal paraffins and hydrocarbons.

12. A wind turbine (1) according to claim 11, wherein: The grease remover has a viscosity greater than 0.7 g / cm 3 , more preferably greater than 0.75 g / cm 3 and less than 0.82g / cm 3 , and more preferably less than 0.8 g / cm 3 , or substantially 0.77 g / cm 3 density; and The grease remover has a thickness greater than 1.5 mm 2 / s, more preferably greater than 1.8 mm 2 / s and less than 2.5mm 2 / s, more preferably less than 2.0 mm 2 / s, more preferably less than 1.9 mm 2 / s, or basically 1.88mm 2 / s kinematic viscosity.

13. Use of a cleaning agent for cleaning windings (202) and / or magnetic elements (214) of a generator (200) of a wind turbine (1), wherein the cleaning agent comprises a grease remover, and wherein the grease remover: is water-insoluble; and is a fluid liquid that enables a wind turbine generator (200) to be flushed with a grease remover; and With more than 0.6g / cm 3 And less than 0.85g / cm 3 density; and With more than 1.3mm 2 / s and less than 2.5mm 2 / s kinematic viscosity; and Includes normal paraffins and hydrocarbons.

14. Use of the cleaning agent according to claim 13, The grease remover has the following density: The density is greater than 0.7 g / cm 3 , more preferably greater than 0.75 g / cm 3 , and less than 0.82g / cm 3 , and more preferably less than 0.8 g / cm 3 ,or The density is substantially 0.77 g / cm 3 , And among them, The grease remover has the following kinematic viscosity: The kinematic viscosity is greater than 1.5 mm 2 / s, preferably greater than 1.8mm 2 / s, and less than 2.5mm 2 / s, more preferably less than 2.0 mm 2 / s, more preferably less than 1.9 mm 2 / s, or The kinematic viscosity is basically 1.88 mm 2 / s.

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