CN112879247A

CN112879247A - Lightning protection sliding connection device of variable pitch system

Info

Publication number: CN112879247A
Application number: CN202110082206.3A
Authority: CN
Inventors: 阮庆洲; 俞庆; 刘琳; 倪青荣; 冉小锋; 郜广军
Original assignee: Shanghai Electric Wind Power Group Co Ltd
Current assignee: Shanghai Electric Wind Power Group Co Ltd
Priority date: 2021-01-21
Filing date: 2021-01-21
Publication date: 2021-06-01

Abstract

The embodiment of the invention provides a lightning protection sliding connection device of a pitch system, which is applied to a wind generating set. The lightning protection sliding connection device of the variable pitch system comprises a conductive belt and a sliding connection component. The conductive belt is installed on a variable pitch bearing of the wind generating set. The sliding connection part is connected with the conductive belt in a sliding mode. The wind generating set comprises a wind generating set body, a blade connecting component and a conductive belt, wherein the conductive belt is provided with an insulating surface electrically insulated from a variable pitch bearing of the wind generating set and a conductive surface electrically connected with the sliding connecting component, the input end of the sliding connecting component is connected to a down lead component of the wind generating set body, the down lead component is used for receiving lightning current from the blade, and the output end of the down lead component is connected to the hub body of. Therefore, the reliability of the wind generating set in the operation process can be improved, and the risk of damage of the wind generating set blade caused by lightning stroke is reduced.

Description

Lightning protection sliding connection device of variable pitch system

Technical Field

The embodiment of the invention relates to the technical field of wind power, in particular to a lightning protection sliding connection device of a variable pitch system.

Background

With the gradual depletion of energy sources such as coal and petroleum, human beings increasingly pay more attention to the utilization of renewable energy sources. Wind energy is increasingly gaining attention as a clean renewable energy source in all countries of the world. The wind power generation device is very suitable for and can be used for generating electricity by utilizing wind power according to local conditions in coastal islands, grassland pasturing areas, mountain areas and plateau areas with water shortage, fuel shortage and inconvenient traffic. Wind power generation refers to converting kinetic energy of wind into electric energy by using a wind generating set.

Wind power plants have developed very rapidly in recent years. According to statistics of wind power machinery conferences of the China mechanical industry Association, in 2019, 588 machines of wind power machinery on China offshore are additionally arranged, the installed capacity is 249 ten thousand kilowatts, the year-on-year increase is 50.9%, and 703 ten thousand kilowatts are accumulated. From IEC 61400-24: 2019, it is seen that the pacific region has reached a lightning activity level of red (highest level), while the eastern coastal region of China has a lightning activity level of yellow (second highest level).

As fan capacity increases, hub height and blade diameter also increase. The probability of the wind generating set suffering from lightning strike is increased. In the aspect of lightning protection of a pitch system, the current wind generating set mainly adopts the technical schemes of cable twisting connection, connection of a cable leading to a bearing carbon brush through a wall bushing, conduction of lightning current on a pitch bearing by using the carbon brush, and the like. For twisted cable connection, the technical defects are that the cable joint is easy to fail due to the rotation of a variable pitch bearing, the contact resistance of the cable joint is increased, the joint is corroded when lightning stroke occurs, and the contact resistance is further increased; for a complex system of the cable through-wall conduit, the defect is that in the twisting process of the cable, the cable is positioned in the through-wall conduit, and the transition point is easy to wear to cause abnormal insulation, so that other nearby equipment is discharged; for direct carbon brush connection of the pitch bearing, although a part of lightning current can be guided away, the pitch bearing cannot be insulated from the hub, so that part of the lightning current still passes through the pitch bearing to cause electric corrosion to the pitch bearing.

Disclosure of Invention

The embodiment of the invention aims to provide a lightning protection sliding connection device of a pitch system, which can improve the reliability of a wind generating set in the operation process and reduce the risk of damaging blades of the wind generating set by lightning.

One aspect of the embodiment of the invention provides a lightning protection sliding connection device of a variable pitch system, which is applied to a wind generating set. The device comprises a conductive belt and a sliding connecting part. The conductive belt is installed on a variable pitch bearing of the wind generating set. The sliding connection part is connected with the conductive belt in a sliding mode. The conductive belt is provided with an insulating surface electrically insulated from a variable pitch bearing of the wind generating set and a conductive surface electrically connected with the sliding connecting part, the input end of the sliding connecting part is connected to a down-lead part of the wind generating set, used for receiving lightning current from a blade, through the conductive belt, and the output end of the down-lead part is connected to a hub body of the wind generating set.

The lightning protection sliding connection device of the pitch system provided by the embodiment of the invention can bear strong lightning stroke of more than 10 times, wherein the lightning current peak value is 200kA, the lightning striking charge is 600C, and the unit energy is 20 MJ/omega.

All cable joints in the lightning protection sliding connection device of the pitch system in the embodiment of the invention are static, the cables are not twisted together with the pitch part, lightning current from the blades directly flows to the hub body, and the shunting of the pitch bearing is 0, so that the reliability of the wind generating set in the operation process is effectively improved, and the risk of damage of the blades of the wind generating set caused by lightning stroke is reduced.

Drawings

FIG. 1 is a schematic view of a lightning protection sliding connection arrangement of a pitch system according to an embodiment of the invention;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a top view of a conductive strip of one embodiment of the present invention;

FIG. 4 is a front view of a conductive strip of one embodiment of the present invention;

FIG. 5 is an enlarged view of the circled portion in FIG. 3;

FIG. 6 is a schematic view of a down conductor component of one embodiment of the present invention;

FIG. 7 is a schematic view of an input/output connection terminal of the down conductor component shown in FIG. 6;

FIG. 8 is a perspective view of an L-shaped adapter member according to one embodiment of the present invention;

FIG. 9 is a top view of the sliding coupling component of one embodiment of the present invention;

fig. 10 is a front view of a slide coupling component according to an embodiment of the invention.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless otherwise defined, technical or scientific terms used in the embodiments of the present invention should have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be noted that, in this specification, the term "input terminal" and "output terminal" are defined in terms of the direction in which a lightning current flows, and the terminal at which the lightning current enters a certain element is referred to as "input terminal", and the terminal at which the lightning current flows out of the element is referred to as "output terminal".

Fig. 1 discloses a schematic view of a lightning protection sliding connection device 100 of a pitch system according to an embodiment of the invention, and fig. 2 is a partial enlarged view of fig. 1. The lightning protection sliding connection device 100 of the pitch system in the embodiment of the invention can be applied to wind generating sets, and is particularly suitable for offshore wind generating sets. As shown in fig. 1 and 2, a pitch system lightning protection sliding connection apparatus 100 according to an embodiment of the present invention includes an electrically conductive strip 101 and a sliding connection member 104/105. The conductive belt 101 is installed on a variable pitch bearing of the wind generating set. The slide connector 104/105 is slidably connected to the conductive strip 101. The conductive belt 101 has an insulating surface electrically insulated from a pitch bearing of the wind turbine generator system, and a conductive surface electrically connected to the sliding connection member 104/105. The sliding connection member 104/105 is connected at an input end to a down conductor member 102 of the wind park for receiving lightning current from the blades by an electrically conductive band 101 and at an output end to a hub body of the wind park.

Fig. 3 to 5 disclose diagrams of the conductive strip 101 according to an embodiment of the present invention, wherein fig. 3 is a top view of the conductive strip 101, fig. 4 is a front view of the conductive strip 101, and fig. 5 is an enlarged view of a circled portion in fig. 3. As shown in fig. 3 to 5, the conductive tape 101 is made of copper, and the cross-sectional area of the conductive tape 101 is 40mm × 8mm or more. The shape of the conductive band 101 coincides with the inner diameter arc of the pitch bearing. In one embodiment, the conductive band 101 is an arc, for example, the length of the conductive band 101 may be about 10cm greater than the circumference of the inner diameter circle of the pitch bearing, the outer side of the arc forming an insulating surface that is electrically insulated from the pitch bearing, and the inner side of the arc forming a conductive surface that is in electrical contact with the sliding connection 104/105. In order to form the above-mentioned insulating and conductive surfaces, the outer, upper and lower sides of the arc may be sprayed with an insulating material having a thickness of, for example, 350 μm, and the inner side of the arc may be plated with copper.

As shown in fig. 4, a plurality of insulation mounting holes 1013 are provided on the conductive strip 101, for example, the plurality of insulation mounting holes 1013 are formed by 8 countersunk holes of 9mm diameter arranged equidistantly on the conductive strip 101 for insulating screws to fasten the conductive strip 101 to the pitch bearing.

As shown in fig. 3 and 5, a double O-type connection terminal 1012 is provided on the conductive tape 101. In one embodiment, the dual-O type connection terminal 1012 has two connection mounting holes with a pitch of 40mm and a diameter of 13mm, and the surface of the dual-O type connection terminal 1012 is plated with a tin-copper material having a sectional area of 30mm × 8mm or more.

As shown in fig. 2, the lightning protection sliding connection device 100 of the pitch system according to the embodiment of the invention further includes an L-shaped adapter component 103, and the down conductor component 102 is connected to the conductive band 101 through the L-shaped adapter component 103. The input end of the L-shaped transition member 103 is connected to the output end connection terminal 1022 of the down conductor member 102, and the output end of the L-shaped transition member 103 is connected to the conductive tape 101 through the double O-shaped connection terminal 1012.

Fig. 6 discloses a schematic view of the down conductor member 102 according to an embodiment of the invention. As shown in fig. 6, the down conductor part 102 includes an input terminal connection 1021, an output terminal connection 1022, and a down conductor 1023 connecting the input terminal connection 1021 and the output terminal connection 1022.

The down conductor 1023 may be formed of, for example, a cross-sectional area of 70mm or more²The hard copper stranded wire consists of hard copper stranded wires, the diameter of a single strand of each stranded wire can be 1.7mm, and each stranded wire is formed by hinging not less than 32 single strand copper wires.

The input terminal 1021 and the output terminal 1022 have the same structure and material. The input terminal 1021 and the output terminal 1022 may be made of, for example, tin-plated copper, and have a cross-sectional area of 24mm × 4mm or more and a mounting area of 74mm × 24mm or more. Fig. 7 discloses a schematic view of the input connection terminal 1021 or the output connection terminal 1022 of the down conductor part 102. As shown in fig. 7, two mounting holes are respectively formed in the input terminal 1021 and the output terminal 1022, each mounting hole has a diameter of 13mm, and the distance between the two mounting holes is 40 mm.

Fig. 8 discloses a perspective view of an L-shaped adapter member 103 according to an embodiment of the invention. As shown in fig. 8, the L-shaped adapter member 103 may be formed by bending a tin-plated copper tape having a length of 190mm and a cross-sectional area of 30mm × 8mm or more by 90 degrees, for example. The two bent surfaces of the L-shaped adapter part 103 are respectively provided with two mounting hole sites with a diameter of 13mm, the two bent surfaces have the same performance, and any one end of the L-shaped adapter part can be used as an input end and an output end of the L-shaped adapter part 103.

In one embodiment, the sliding attachment 104/105 may include at least two. As shown in fig. 1, the sliding connection 104/105 of the embodiment of the present invention includes two sliding connections, i.e. a first sliding connection 104 and a second sliding connection 105, based on the overall consideration of lightning protection and economy. The input ends of the first and second sliding connecting

members

104 and 105 are connected to the conductive band 101, and the output ends of the first and second sliding connecting

members

104 and 105 are connected to the hub body.

The first sliding link 104 and the second sliding link 105 have the same structure and function, and can perform a function of one for use. The single sliding connection part 104/105 can bear the strong lightning stroke of 200kA of lightning current peak, 600C of lightning striking charge and 20 MJ/omega of unit energy for more than 10 times.

Fig. 9 and 10 disclose illustrations of the sliding connection 104/105 of one embodiment of the invention, wherein fig. 9 is a top view of the sliding connection 104/105 and fig. 10 is a front view of the sliding connection 104/105. As shown in fig. 9 and 10 with reference to fig. 2, the sliding connection member 104/105 includes a conductive mounting body (not numbered) fixed to the hub body, a carbon brush 1045 provided on the mounting body for contacting the conductive tape 101, and a carbon brush lead 1048 connected to the carbon brush 1045 and fixed to the mounting body.

In one embodiment, the mounting body includes a mounting base 1041 for fixing to the hub body, a mounting bracket 1042 connected to the mounting base 1041, and a top mounting platform 1043 connected to a top end of the mounting bracket 1042, and the carbon brushes 1045 and the carbon brush leads 1048 are disposed on the top mounting platform 1043. For example, the mounting base 1041 is mounted to the hub body by an electrically communicative locking device. One end of the mounting bracket 1042 is welded on the mounting base 1041, the top mounting platform 1043 is welded on the other end of the mounting bracket 1042, and the welding area of the welding part among the mounting base 1041, the mounting bracket 1042 and the top mounting platform 1043 is more than or equal to 176mm²。

The mounting base 1041, the mounting bracket 1042, and the top mounting platform 1043 are made of stainless steel, such as hot-dip galvanized steel. The sectional areas of the mounting base 1041, the mounting bracket 1042 and the top mounting platform 1043 are more than or equal to 176mm². Conductive paste coatings are arranged on the connecting portions of the mounting base 1041, the mounting bracket 1042 and the top mounting platform 1043. Thus, the top mounting platform 1043, the mounting bracket 1042, and the mounting base 1041 can be made to be an effective bleed down path for lightning current.

As shown in fig. 9 and 10, a carbon brush holder 1046 is further disposed on the top mounting platform 1043, the carbon brush 1045 and the carbon brush lead 1048 are connected together and mounted in the carbon brush holder 1046, and the carbon brush 1045 is fastened in the carbon brush holder 1046 by a compression spring 1047. In one embodiment, the terminals of the carbon brush holder 1046 and the carbon brush lead 1048 may be fixed to the top mounting platform 1043 by bolts, respectively, and the connection surfaces of the carbon brush holder 1046 and the carbon brush lead 1048 and the top mounting platform 1043 are coated with conductive paste, respectively.

In some embodiments, a tip discharge component 1044 may also be disposed on the top mounting platform 1043. The tip discharge component 1044 may serve as a redundant role in lightning protection. When the carbon brush 1045 is failed or malfunctions due to abrasion after being used for a certain period of time, the tip discharge component 1044 may play a role of temporary lightning protection. The shape of the tip discharge member 1044 is, for example, an M-type tip, and the distance of the tip portion of the tip discharge member 1044 from the conductive band 101 is within a predetermined range. For example, the distance between the tip portion of the tip discharge part 1044 and the conductive band 101 is between 3mm ± 2 mm.

The tip discharge member 1044 is made of a stainless steel material, such as a hot-dip galvanized steel material. The tip discharge member 1044 is fixed to the top mounting platform 1043 by bolts, and the connection surface of the tip discharge member 1044 and the top mounting platform 1043 is coated with a conductive paste.

Referring back to fig. 2, when a blade of the wind turbine generator system is struck by lightning, lightning current from the blade flows through the L-shaped adapter part 103 through the down conductor part 102 into the conductive band 101, crosses the pitch bearing from the conductive band 101 through the carbon brush 1045, reaches the carbon brush lead 1048, and then reaches the hub body through the top mounting platform 1043, the mounting bracket 1042 and the mounting base 1041 of the conductive mounting body.

The lightning protection sliding connection device 100 of the pitch system provided by the embodiment of the invention can bear strong lightning stroke of more than 10 times, wherein the lightning current peak value is 200kA, the lightning striking charge is 600C, and the unit energy is 20 MJ/omega.

All cable joints in the lightning protection sliding connection device 100 of the pitch system in the embodiment of the invention are static, the cables are not twisted together with the pitch part, lightning current from the blades directly flows to the hub body, and the shunting of the pitch bearing is 0, so that the reliability of the wind generating set in the operation process is effectively improved, and the risk of damage of the blades of the wind generating set caused by lightning stroke is reduced.

The lightning protection sliding connection device of the pitch system provided by the embodiment of the invention is described in detail above. The lightning protection sliding connection device of the pitch system according to the embodiment of the invention is described herein by using specific examples, and the above description of the embodiments is only used to help understanding the core idea of the invention, and is not intended to limit the invention. It should be noted that, for those skilled in the art, various improvements and modifications can be made without departing from the spirit and principle of the present invention, and these improvements and modifications should fall within the scope of the appended claims.

Claims

1. The utility model provides a become lightning protection sliding connection device of oar system, is applied to wind generating set, its characterized in that: the device comprises:

the conductive belt is arranged on a variable pitch bearing of the wind generating set; and

a sliding connection part slidably connected with the conductive strip,

the conductive belt is provided with an insulating surface electrically insulated from a variable pitch bearing of the wind generating set and a conductive surface electrically connected with the sliding connecting part, the input end of the sliding connecting part is connected to a down-lead part of the wind generating set, used for receiving lightning current from a blade, through the conductive belt, and the output end of the down-lead part is connected to a hub body of the wind generating set.

2. The apparatus of claim 1, wherein: the shape of the conductive belt is superposed with the inner diameter circular arc of the variable pitch bearing.

3. The apparatus of claim 2, wherein: the conductive band is a section of circular arc, the outer side of the circular arc forms the insulating surface which is electrically insulated from the variable-pitch bearing, and the inner side of the circular arc forms the conductive surface which is electrically contacted with the sliding connection component.

4. The apparatus of claim 3, wherein: the conductive band is made of copper, the outer side, the upper side and the lower side of the arc are sprayed with insulating materials with certain thicknesses, and the inner side of the arc is plated with tin by using a copper plating process.

5. The apparatus of claim 1, wherein: and a plurality of insulating mounting hole positions are arranged on the conductive belt and used for fastening the conductive belt on the variable-pitch bearing through insulating screws.

6. The apparatus of claim 1, wherein: the sliding connection part comprises a first sliding connection part and a second sliding connection part, input ends of the first sliding connection part and the second sliding connection part are connected with the conductive belt, and output ends of the first sliding connection part and the second sliding connection part are connected to the hub body.

7. The apparatus of claim 1, wherein: the sliding connection component comprises a conductive installation body fixed on the hub body, a carbon brush arranged on the installation body and used for being in contact with the conductive belt, and a carbon brush lead connected with the carbon brush and fixed on the installation body.

8. The apparatus of claim 7, wherein: the mounting body comprises a mounting base used for being fixed on the hub body, a mounting support connected to the mounting base and a top mounting platform connected to the top end of the mounting support, and the carbon brush lead are arranged on the top mounting platform.

9. The apparatus of claim 8, wherein: the mounting base is mounted to the hub body through an electrically communicative locking device.

10. The apparatus of claim 8, wherein: still be provided with the carbon brush holder on the mounting platform of top, the carbon brush with the carbon brush lead wire install in the carbon brush holder, and, the carbon brush passes through the pressure spring and fastens in the carbon brush holder.

11. The apparatus of claim 10, wherein: and terminals of the carbon brush holder and the carbon brush lead are respectively fixed on the top mounting platform through bolts, and the connection surfaces of the carbon brush holder and the carbon brush lead and the top mounting platform are respectively coated with conductive paste.

12. The apparatus of claim 8, wherein: the mounting base, the mounting bracket and the top mounting platform are all made of stainless steel.

13. The apparatus of claim 8, wherein: and the connecting parts of the mounting base, the mounting bracket and the top mounting platform are all provided with conductive paste coatings.

14. The apparatus of claim 8, wherein: and a point discharge component is also arranged on the top mounting platform.

15. The apparatus of claim 14, wherein: the distance between the tip discharge part and the conductive strip is within a predetermined range.

16. The apparatus of claim 14, wherein: the point discharge component is made of stainless steel.

17. The apparatus of claim 14, wherein: the point discharge component is fixed on the top mounting platform through a bolt, and the connecting surface of the point discharge component and the top mounting platform is coated with conductive paste.

18. The apparatus of claim 1, wherein: further comprising:

and the down lead component is connected to the conductive belt through the L-shaped adapter component.

19. The apparatus of claim 18, wherein: the L-shaped adapter part is formed by bending a tinned copper strip by 90 degrees.

20. The apparatus of claim 18, wherein: the input of L type switching part is connected to the output connecting terminal of downlead part be provided with two O type connecting terminal on the conducting strip, the output of L type switching part passes through two O type connecting terminal are connected to the conducting strip.