CA2996390A1 - Static discharger for wind turbine - Google Patents
Static discharger for wind turbine Download PDFInfo
- Publication number
- CA2996390A1 CA2996390A1 CA2996390A CA2996390A CA2996390A1 CA 2996390 A1 CA2996390 A1 CA 2996390A1 CA 2996390 A CA2996390 A CA 2996390A CA 2996390 A CA2996390 A CA 2996390A CA 2996390 A1 CA2996390 A1 CA 2996390A1
- Authority
- CA
- Canada
- Prior art keywords
- turbine
- blade
- lightning
- conductor
- friction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/30—Lightning protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
- H02G13/80—Discharge by conduction or dissipation, e.g. rods, arresters, spark gaps
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
- H05F3/00—Carrying-off electrostatic charges
- H05F3/02—Carrying-off electrostatic charges by means of earthing connections
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
Abstract
The invention is the construction of an electrostatic discharging brush and a lightning registration system, its mounting assembly, and the installation method, on certain wind turbines (Gamesa G8x/9x). The invention allows continuous drainage of turbine blade static electricity to the electrical ground of the nacelle by offering two mechanical degrees of freedom, one between the device and the blade and one between the device and the nacelle combined with the ability to use a Lightning Registration Card to record lightning strikes on the blade. The invention is characterised by its ease of installation, requiring no modification to the turbine, while also creating a path for static electricity and lightning current to drain from the blade to the ground of the nacelle avoiding the leakage of such electrical charge to the drivetrain of the turbine including the Main Bearings as well as the ability to record lightning strikes on the turbine. The invention is comprised of a double conduction system with spring loaded brush contact surfaces that maintain continuous contact and a controlled rate of wear that provides for a service life longer than the prescribed Preventive Maintenance of the turbine. The design accommodates varying distances and geometries due to aging and manufacturing tolerances that exist amongst the target population of similar wind turbines.
Description
Static Discharger for Wind Turbine This invention provides a device for removing static electricity from blades of a wind turbine and a method for registering lightning strikes on the turbine using a third party Lightning Registration Card.
Field of the Invention The invention generally pertains to the field of renewable power generation.
More specifically the invention relates to operational engineering for wind turbines and the electrical maintenance of such equipment.
Background Of The Invention A modern wind turbine, like any other tall structure, is subject to lightning and therefore is equipped with an electrically conductive lightning protection system comprised of a cable extending from near the tip of each blade to the electrical ground of the turbine and eventually to the Protective Earth (FIG 1). Meanwhile the moving blade of a wind turbine is subject to generation and/or collection of static electricity while travelling through the air, even in the absence of direct lightning activity, and is known to accumulate high voltage levels of static electricity if not drained. In certain wind turbine models, i.e., Gamesa G8x and G9x, the lightning system is comprised of an umbilical cable embedded in the blade that terminates at the Blade Root Conduction Band. This conduction band is part of the blade and rotates with the blade both with pitching of the blade(change of blade angle of attack) and with spinning of the blade around the main shaft. Opposite to the blade, and installed on the nacelle of the turbine, is a grounded Rotor Cuff (Nacelle Gutter Ring) that is separated by varying distances of multiple inches (FIG la). The turbine is equipped with a contactless lightning transmission system that covers some of the distance between the Blade Conduction Band and the grounded Rotor Cuff.
This contactless lightning protection system meets the Blade Conduction Blade and the Rotor Cuff on each side at an Arc receptor. With increase of voltage in the blade umblical system, whether as a result of a lightning strike or accumulation of electrostatic charges the airgap between the blade Condution Band and the grounded Rotor Cuff ionizes, allowing the travel of the current from the blade to to the Arc Receptor, through the Transmission Cyclinder and to the other Arc Receptor and eventually to the grounded Rotor Cuff and eventually to the Protective Earth of the turbine.
The Arc Receptors and the Transmission Cylinder are held in between the Conduction Band and the Rotor Cuff using an Isolating Cylinder (FIG la) and rotate with the Mainshaft and the blade. However they do not change position with the change of blade angle (i.e., the pitch of the blade). As such, the process of blade grounding in this setup requires two degrees of freedom, which are integral to solving the problem posed by the independently varying distances of the air gap and changes to this airgap across different units in existence due to aging and manufacturing differences.
The existence of two air gaps along this drainage path causes an accumulation of static electricity charge in the wind turbine blades where the blade rotates against the Mainshaft and where the Mainshaft rotates against the body of the wind turbine nacelle (FIG
la). That is to say, because the discharge path to the ground is not continuous, the static electricity charge builds up until it comes to ionize the air, eventually discharging across the whole expanse of each air gap to the ground. It has been observed that steady and continuous removal of incidental static electricity charge on the blades prevents disturbances to the machine grounding system and its control systems and therefore drastically improves the operational availability of the machine and reduces stress on the components. The invention is a mechanism for such continuous drainage. It is accepted practice in electrical engineering to ensure that the grounding path for lightning and static electricity remains unimpeded. Due to the blade's ability to rotate against the Mainshaft (i.e., the Hub), and the Mainshaft against the body of the turbine, a brush system with 2 mechanical degrees of freedom becomes desirable to facilitate a continuous conduction path. It is also accepted that grounding of the this static electricity to the Mainshaft of the turbine is not in line with good practices and can cause damage to the mainbearings of the shaft and must therefore be avoided. It is to be noted that the problem of creating an electrical path in and out of a rotating shaft is a common problem amongst rotating machineries with many prior examples commonly in use. Both the concept of grounding a system subject to lightning or static electricity and the use of a brush system for conduction to and from a rotating shaft are considered in and of themselves common knowledge in the field.
Typical setups for removal of electricity in different machinery find many precedents, for example US Patent 662,643 1991/03/01, TWERDOCHLIB
CA 2775262, Smith However, though various grounding brush systems exist, none were found that can be used in the aforementioned equipment ( Gamesa models G8x/9x) without modification to other parts of the OEM equipment, while also being installable in less than 1 hour, and while accommodating the use of a Lightning Registration Card, and/or without allowing the leakage of excess incidental electricity into the Mainshaft and therefore the main bearings of the turbine.
Summary Of The Invention Considered broadly, the invention includes the mounting technique, support apparatus, the conduction assembly, and a card holding assembly, that provides continuous grounding of the wind turbine blade system using a durable conduction system that resists abrasion and can be installed in an operating wind turbine without modifications to the existing OEM parts, including no removal of any of the lightning protection system (LPS) originally installed on the turbine. The system to be patented also allows addition of an industry-standard 3rd party lightning registration card (FIG 3).
The invention(FIG 3) is comprised of a double-ended brush system mounted on a support bracket(FIG 3a) that is attached during installation to an existing part of the turbine. The support bracket allows the attachment of the rest of the device to the turbine LPS
using existing OEM
hardware on the "candlestick" support arm between the Arc Receptors and the transmission cylinder. The conduction system, a double brush assembly allowing 2 degrees of freedom, is, on the first side, a brush that meets the grounded connection on the nacelle of the wind turbine (also known as the Rotor Cuff or the Gutter Ring) and, on the second side, another brush that meets the electrical Blade Root Conduction Band of the wind turbine blade.
This Blade Root Conduction Band is where the lightning umbilical cord of the blade terminates.
The brushes provide ample flexibility which enables them to be used in turbines that have varying distances between the blades and the OEM support arm, and the nacelle Gutter Ring and the OEM
support arm.
The inner construction of the Static Discharger conductor parts provide for a uniform force and even rate of wear on OEM turbine components, as well as self lubrication of the turbine parts in friction. The device is designed such that it could sustain normal operation of the wind turbine for a period longer than the prescribed Preventive Maintenance of 6 months.
In the drawings, which form a part of this specification, Fig. 1 Layout of a turbine and the main path of the lightning electricity to the grounded tower Fig la. Close up of an original single blade Lightning protection system and its components Fig. 2 Static Discharger mounted on the original lightning protection system Isolation Cylinder and its both brush ends Fig 2a. Static Discharger mounted on the original lightning protection Isolation Cylinder seen from above the Isolation Cylinder Fig. 3 The Static Discharger, with its conduction, support and primer system shown Fig. 4 Inside construction of the device conductor system including the elastic spine and the grease dispensing mechanism Fig. 5 is the method of installation for the Static Discharger on the turbine lightning protection system arm Detailed Description Of The Invention The support bracket is comprised of two legs (FIG 3) that are compressed between the removable and replaceable Arc Receptor tips of the turbine LPS Insulation Cylinder, colloquially known as the "Candlestick." The distance between the arms allows for easy installation of the device and the length of the arms is sufficient for a proper placement of the brush system as intended.
The brush system is constructed from a flexible copper brush with sufficient flexibility and range of motion.
On the side where the brush system meets the Blade Conduction Band ("the Blade Side"), the brush is formed by a loop of copper that exists the housing of the Dischargers, approaches the Blade Conduction band and returns to the house forming an elliptical loop. The conductor is supported by a low-friction elastic spine on the inside to provide rigidity of the shape and continuous pressure on the soft copper conductor against the Blade Conduction Band (FIG2).
This elastic spine is the spring element that provides flexibility to accomodate various positions and distances while maintaining the sufficient pressure between the brush conductor and the Blade Conduction band.
The conductor, or brush, is made of a hollow Outer Copper conductor tube, a hollow Inner conductor tube, the elastic spine made of the appropriate metal or polymer and the Grease Dispenser.
After an initial wear period, and with the wearing off of the early layers of the copper conductor, the grease dispenser is exposed and provides lubrication, reducing the wear rate to enhance the discharger system's service life. The Grease Dispenser is a vein system at the core of the conductor that provides a gradual supply of fire-retardant lubricant to extend the life of the device in service(FIG4).
On the other side, the Nacelle side, the copper braid extends out of the assembly forming a conductive tail that is in contact with the nacelle Rotor Cuff. The length of the tail is sufficient to provide continuous contact with the nacelle ground throughout the operation of the rotor cycle (around the circle of the rotor rotation). The Tail end is also supported by a low-friction spring that, after the initial wear period, will act as the main friction surface and therefore reduces the metal-to-metal friction and extends the life of the device. The angle at which the tail end of the device meets the Rotor Cuff controls the friction force, allowing for further reduction of the wear and extension of the service life.
The Grease Dispenser extends from the Blade-side to the Nacelle-side and through a similar mechanism of wear and grease release, extends the life of the device.
As previously described, the entire conduction system(FIG 4) is comprised of three layers of hollow braided tube-like copper cable, supported in the core by a spring spine system that maintains the shape of the wire throughout the unsupported air gaps. Inside the hollow tubing copper braid, and along with the spring spine, a longitudinal reservoir, the Grease Dispenser, containing non-flammable grease is placed, which will gradually release the grease over time to lubricate the friction surface and elongate the life of the contact metal as the device remains in service.
On the Nacelle Side, where it meets the Rotor Cuff, and at the very end of the tail, a Primer Pack is attached that is constructed of mildly abrasive skin on a appropriately weak shell containing non-flammable grease. In the early phases of the operation, the abrasive shell of the Primer Pack will smooth the burrs on the Rotor Cuff to eliminate sharp and destructive edges.
Further along the service life, the friction from contact with the Rotor Cuff will wear the weak shell open to allow the gradual seepage of the grease along the surface of the Rotor Cuff for the purpose of lubrication. Through the operation of the turbine, the Primer Pack has been designed to naturally slough off leaving an evenly greased surface that increases the longevity of the Static Discharger conductor's service life.
The plastic housing of the invention could accommodate a 3rd party Lightning Registration card that at its end meets the conductor inside the Static Discharger housing as it travels from one brush to the other. The card is secured inside the housing for service using a hole in the housing and a cable-tie
Field of the Invention The invention generally pertains to the field of renewable power generation.
More specifically the invention relates to operational engineering for wind turbines and the electrical maintenance of such equipment.
Background Of The Invention A modern wind turbine, like any other tall structure, is subject to lightning and therefore is equipped with an electrically conductive lightning protection system comprised of a cable extending from near the tip of each blade to the electrical ground of the turbine and eventually to the Protective Earth (FIG 1). Meanwhile the moving blade of a wind turbine is subject to generation and/or collection of static electricity while travelling through the air, even in the absence of direct lightning activity, and is known to accumulate high voltage levels of static electricity if not drained. In certain wind turbine models, i.e., Gamesa G8x and G9x, the lightning system is comprised of an umbilical cable embedded in the blade that terminates at the Blade Root Conduction Band. This conduction band is part of the blade and rotates with the blade both with pitching of the blade(change of blade angle of attack) and with spinning of the blade around the main shaft. Opposite to the blade, and installed on the nacelle of the turbine, is a grounded Rotor Cuff (Nacelle Gutter Ring) that is separated by varying distances of multiple inches (FIG la). The turbine is equipped with a contactless lightning transmission system that covers some of the distance between the Blade Conduction Band and the grounded Rotor Cuff.
This contactless lightning protection system meets the Blade Conduction Blade and the Rotor Cuff on each side at an Arc receptor. With increase of voltage in the blade umblical system, whether as a result of a lightning strike or accumulation of electrostatic charges the airgap between the blade Condution Band and the grounded Rotor Cuff ionizes, allowing the travel of the current from the blade to to the Arc Receptor, through the Transmission Cyclinder and to the other Arc Receptor and eventually to the grounded Rotor Cuff and eventually to the Protective Earth of the turbine.
The Arc Receptors and the Transmission Cylinder are held in between the Conduction Band and the Rotor Cuff using an Isolating Cylinder (FIG la) and rotate with the Mainshaft and the blade. However they do not change position with the change of blade angle (i.e., the pitch of the blade). As such, the process of blade grounding in this setup requires two degrees of freedom, which are integral to solving the problem posed by the independently varying distances of the air gap and changes to this airgap across different units in existence due to aging and manufacturing differences.
The existence of two air gaps along this drainage path causes an accumulation of static electricity charge in the wind turbine blades where the blade rotates against the Mainshaft and where the Mainshaft rotates against the body of the wind turbine nacelle (FIG
la). That is to say, because the discharge path to the ground is not continuous, the static electricity charge builds up until it comes to ionize the air, eventually discharging across the whole expanse of each air gap to the ground. It has been observed that steady and continuous removal of incidental static electricity charge on the blades prevents disturbances to the machine grounding system and its control systems and therefore drastically improves the operational availability of the machine and reduces stress on the components. The invention is a mechanism for such continuous drainage. It is accepted practice in electrical engineering to ensure that the grounding path for lightning and static electricity remains unimpeded. Due to the blade's ability to rotate against the Mainshaft (i.e., the Hub), and the Mainshaft against the body of the turbine, a brush system with 2 mechanical degrees of freedom becomes desirable to facilitate a continuous conduction path. It is also accepted that grounding of the this static electricity to the Mainshaft of the turbine is not in line with good practices and can cause damage to the mainbearings of the shaft and must therefore be avoided. It is to be noted that the problem of creating an electrical path in and out of a rotating shaft is a common problem amongst rotating machineries with many prior examples commonly in use. Both the concept of grounding a system subject to lightning or static electricity and the use of a brush system for conduction to and from a rotating shaft are considered in and of themselves common knowledge in the field.
Typical setups for removal of electricity in different machinery find many precedents, for example US Patent 662,643 1991/03/01, TWERDOCHLIB
CA 2775262, Smith However, though various grounding brush systems exist, none were found that can be used in the aforementioned equipment ( Gamesa models G8x/9x) without modification to other parts of the OEM equipment, while also being installable in less than 1 hour, and while accommodating the use of a Lightning Registration Card, and/or without allowing the leakage of excess incidental electricity into the Mainshaft and therefore the main bearings of the turbine.
Summary Of The Invention Considered broadly, the invention includes the mounting technique, support apparatus, the conduction assembly, and a card holding assembly, that provides continuous grounding of the wind turbine blade system using a durable conduction system that resists abrasion and can be installed in an operating wind turbine without modifications to the existing OEM parts, including no removal of any of the lightning protection system (LPS) originally installed on the turbine. The system to be patented also allows addition of an industry-standard 3rd party lightning registration card (FIG 3).
The invention(FIG 3) is comprised of a double-ended brush system mounted on a support bracket(FIG 3a) that is attached during installation to an existing part of the turbine. The support bracket allows the attachment of the rest of the device to the turbine LPS
using existing OEM
hardware on the "candlestick" support arm between the Arc Receptors and the transmission cylinder. The conduction system, a double brush assembly allowing 2 degrees of freedom, is, on the first side, a brush that meets the grounded connection on the nacelle of the wind turbine (also known as the Rotor Cuff or the Gutter Ring) and, on the second side, another brush that meets the electrical Blade Root Conduction Band of the wind turbine blade.
This Blade Root Conduction Band is where the lightning umbilical cord of the blade terminates.
The brushes provide ample flexibility which enables them to be used in turbines that have varying distances between the blades and the OEM support arm, and the nacelle Gutter Ring and the OEM
support arm.
The inner construction of the Static Discharger conductor parts provide for a uniform force and even rate of wear on OEM turbine components, as well as self lubrication of the turbine parts in friction. The device is designed such that it could sustain normal operation of the wind turbine for a period longer than the prescribed Preventive Maintenance of 6 months.
In the drawings, which form a part of this specification, Fig. 1 Layout of a turbine and the main path of the lightning electricity to the grounded tower Fig la. Close up of an original single blade Lightning protection system and its components Fig. 2 Static Discharger mounted on the original lightning protection system Isolation Cylinder and its both brush ends Fig 2a. Static Discharger mounted on the original lightning protection Isolation Cylinder seen from above the Isolation Cylinder Fig. 3 The Static Discharger, with its conduction, support and primer system shown Fig. 4 Inside construction of the device conductor system including the elastic spine and the grease dispensing mechanism Fig. 5 is the method of installation for the Static Discharger on the turbine lightning protection system arm Detailed Description Of The Invention The support bracket is comprised of two legs (FIG 3) that are compressed between the removable and replaceable Arc Receptor tips of the turbine LPS Insulation Cylinder, colloquially known as the "Candlestick." The distance between the arms allows for easy installation of the device and the length of the arms is sufficient for a proper placement of the brush system as intended.
The brush system is constructed from a flexible copper brush with sufficient flexibility and range of motion.
On the side where the brush system meets the Blade Conduction Band ("the Blade Side"), the brush is formed by a loop of copper that exists the housing of the Dischargers, approaches the Blade Conduction band and returns to the house forming an elliptical loop. The conductor is supported by a low-friction elastic spine on the inside to provide rigidity of the shape and continuous pressure on the soft copper conductor against the Blade Conduction Band (FIG2).
This elastic spine is the spring element that provides flexibility to accomodate various positions and distances while maintaining the sufficient pressure between the brush conductor and the Blade Conduction band.
The conductor, or brush, is made of a hollow Outer Copper conductor tube, a hollow Inner conductor tube, the elastic spine made of the appropriate metal or polymer and the Grease Dispenser.
After an initial wear period, and with the wearing off of the early layers of the copper conductor, the grease dispenser is exposed and provides lubrication, reducing the wear rate to enhance the discharger system's service life. The Grease Dispenser is a vein system at the core of the conductor that provides a gradual supply of fire-retardant lubricant to extend the life of the device in service(FIG4).
On the other side, the Nacelle side, the copper braid extends out of the assembly forming a conductive tail that is in contact with the nacelle Rotor Cuff. The length of the tail is sufficient to provide continuous contact with the nacelle ground throughout the operation of the rotor cycle (around the circle of the rotor rotation). The Tail end is also supported by a low-friction spring that, after the initial wear period, will act as the main friction surface and therefore reduces the metal-to-metal friction and extends the life of the device. The angle at which the tail end of the device meets the Rotor Cuff controls the friction force, allowing for further reduction of the wear and extension of the service life.
The Grease Dispenser extends from the Blade-side to the Nacelle-side and through a similar mechanism of wear and grease release, extends the life of the device.
As previously described, the entire conduction system(FIG 4) is comprised of three layers of hollow braided tube-like copper cable, supported in the core by a spring spine system that maintains the shape of the wire throughout the unsupported air gaps. Inside the hollow tubing copper braid, and along with the spring spine, a longitudinal reservoir, the Grease Dispenser, containing non-flammable grease is placed, which will gradually release the grease over time to lubricate the friction surface and elongate the life of the contact metal as the device remains in service.
On the Nacelle Side, where it meets the Rotor Cuff, and at the very end of the tail, a Primer Pack is attached that is constructed of mildly abrasive skin on a appropriately weak shell containing non-flammable grease. In the early phases of the operation, the abrasive shell of the Primer Pack will smooth the burrs on the Rotor Cuff to eliminate sharp and destructive edges.
Further along the service life, the friction from contact with the Rotor Cuff will wear the weak shell open to allow the gradual seepage of the grease along the surface of the Rotor Cuff for the purpose of lubrication. Through the operation of the turbine, the Primer Pack has been designed to naturally slough off leaving an evenly greased surface that increases the longevity of the Static Discharger conductor's service life.
The plastic housing of the invention could accommodate a 3rd party Lightning Registration card that at its end meets the conductor inside the Static Discharger housing as it travels from one brush to the other. The card is secured inside the housing for service using a hole in the housing and a cable-tie
Claims (7)
1. Method of attachment to the turbine (including the two-prong discharger bracket design) that allows quick installation without modification to any existing OEM parts of the turbine and in particular no modifications to the turbine lightning protection system
2. The use of an elastic and low-friction spine embedded in the conductor to allow for even and continuous force on the conductor against the friction surfaces such that the conductor remains in contact with the Blade Root Conduction Band and the Rotor Cuff throughout its rotation cycle
3. The use of elastic and low-friction spine as a friction surface against the metal of the turbine to reduce the wear of the conductor and therefore increase the life of the device
4. The use of elastic and low-friction spine to form the conductor into a shape that allows for optimal self-positioning and therefore friction and the ability to move and pivot. The tail end of the device, where it is in contact with the nacelle of the turbine FIG 2 is angled tail to control the forces at the contact point and therefore the wear of the conductor
5. Integration of an internal lubrication duct containing flame-resistant grease for self lubrication of the friction surfaces and therefore extension of the device life
6. Use of a Primer Assembly to prepare and lubricate the Rotor Cuff surface without any additional action on the part of the turbine operator
7. Integration of lightning registration cards in the body of the device to allow for recording of moderate to severe lightning strikes on the turbine blade
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2996390A CA2996390A1 (en) | 2018-02-26 | 2018-02-26 | Static discharger for wind turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2996390A CA2996390A1 (en) | 2018-02-26 | 2018-02-26 | Static discharger for wind turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2996390A1 true CA2996390A1 (en) | 2019-08-26 |
Family
ID=67769764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2996390A Abandoned CA2996390A1 (en) | 2018-02-26 | 2018-02-26 | Static discharger for wind turbine |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2996390A1 (en) |
-
2018
- 2018-02-26 CA CA2996390A patent/CA2996390A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |
Effective date: 20210831 |
|
| FZDE | Discontinued |
Effective date: 20210831 |