JP4579084B2 - Bus duct connection structure and wind power generation system using the bus duct connection structure - Google Patents

Description

  The present invention relates to a bus duct connection structure for connecting bus ducts to each other and a wind power generation system using the bus duct connection as an energization line.

  A plurality of bus ducts are usually connected over a long distance. Therefore, it is necessary to take measures against the expansion and contraction of the conductor loaded in the whole. For example, Patent Document 1 discloses a structure for absorbing expansion and contraction of a conductor of a bus duct installed in this way. The technique of patent document 1 improves the expansion part which accepts expansion / contraction of a conductor, and can avoid a contact with an expansion part and an adjacent bus duct. As a result, the distance between the bus ducts of different systems arranged in parallel is reduced.

Japanese Utility Model Publication No. 43-11876

  However, the configuration of the expansion portion of the bus duct connecting device is configured by connecting the inner conductor with a stretchable conductor and covering it with a stretchable box. Although a specific assembly structure is not disclosed, it is considered that the stretchable box and the bus duct are coupled and fixed by a fastening member such as a bolt. In addition, it is considered that the stretchable box is configured to allow deformation only in the extension direction of the bus duct, that is, in the stretch direction.

  Therefore, when a vibration including a vector component in a direction orthogonal to the extension direction occurs in the bus duct itself due to an earthquake or the like, the expansion portion is in a state fixed to the bus duct, so that the swing can be allowed. However, there is a problem that excessive stress is generated in the connecting portion.

  For example, for power wiring installed in a tower of a wind power generation system, the tower has a height of several tens of meters. Therefore, the work of wiring the wires to the top of the tower is heavy and the weight of the wires is heavy. The complicated work of pulling up is performed. Therefore, it is desirable to use the bus duct for wiring in the tower of such a wind power generation system, but the tower may be shaken by an earthquake or strong wind, etc., and bending stress due to shaking was added to the normal bus duct main line There is a situation that it is not possible to respond sufficiently in some cases.

  The present invention has been made in view of the above-described various circumstances, and an object of the present invention is to provide a bus duct that can sufficiently tolerate a swing including a vector component in a direction orthogonal to the extending direction of the connected and extending bus duct. It is to provide a connection structure and a wind power generation system including the bus duct connection structure.

In order to solve the above problem, a bus duct connection structure according to claim 1 is:
A bus duct connection structure having a housing structure capable of accommodating a power transmission conductor therein and connected to each other to have a desired length, a connection portion housing for accommodating a connection portion between bus ducts, and the connection portion housing A flexible conductor that electrically connects the in-phase conductors, and the connection portion housing is composed of a plurality of housing members, and each housing member is attached by bending the flexible conductors. is the extent permitted a mounting structure in a state in which with play, each connection housing includes a cover member covering the flexible conductors, each connecting portion between the conductor of the end portions and the bus duct the flexible conductor And a connecting cover member that covers each of the cover members, and the connection between the cover member and the connecting cover member is an attachment structure having the play. The bus duct connection structure according to claim 2 has a housing structure in which a power transmission conductor can be accommodated, and is connected to each other to be installed at a desired length. A connecting portion housing, and a flexible conductor that electrically connects the in-phase conductors in the connecting portion housing. The connecting portion housing includes a plurality of housing members, and each housing member is attached to the housing. Is a mounting structure in which the housing members are coupled together with a play in a range that allows the flexible conductor to bend, and the mounting structure coupled with the play is an extension of the bus duct. The structure includes play in a direction orthogonal to the direction.

  Accordingly, it is possible to allow a swing having a vector component in a direction orthogonal to the extension direction of the connected bus duct without further increasing the size of the connection portion. That is, by allowing the flexible conductor to bend by the play mounting structure of the connecting portion housing, it is possible to allow the positional displacement between the bus ducts without causing the housing to be destroyed. Thereby, the stress which arises in a connection part by the shake by an earthquake etc. can be absorbed with the bending of a flexible conductor, and the play of the member of a connection part housing.

The bus duct connection structure according to claim 3 is characterized in that the coupling portion having the play is formed in the vicinity of a portion where the flexible conductor bends in the extending direction of the bus duct. The bus duct connection structure according to claim 4 is characterized in that the coupling portion having the play is provided on both end sides of the flexible conductor. In the bus duct connection structure according to claim 5, the connection housing includes a cover member that covers the flexible conductor, a connection cover member that covers each connection portion between the end of the flexible conductor and the bus duct conductor, And the attachment between the cover member and the connecting cover member is a mounting structure with play.

The bus duct connection structure according to claim 6 is:
The cover member includes a side plate that covers a side surface portion of the flexible conductor and a lid plate that covers an upper and lower surface portion, and the connection cover member connects the end portion of the flexible conductor and the conductor of the bus duct. A connecting portion side plate that covers the side surface portion of the portion, and a connecting portion cover plate that covers the upper and lower surface portions, and the attachment structure having play is between the side plate of the cover member and the connecting portion side plate, or It is formed in at least one between the cover member cover plate and the connecting portion cover plate.

The bus duct connection structure according to claim 7 is:
The mounting structure with play is provided with a long hole extending in the bus duct extending direction in one of the cover member or the connecting cover member, and the fastening member that can be inserted into the long hole with a margin, and the fastening It is characterized in that it is configured by providing a spacer for providing play in the tightening direction of the member.

The bus duct connection structure according to claim 8 is:
The cover member and the connecting cover member have overlapping portions that overlap each other in a final installation state, and an elastic member is interposed in the overlapping portion.

A wind power generation system according to claim 9 is:
In the wind power generation system comprising a wind power generator at the top of the tower and transmitting the power generated by the wind power generator downward,
A wind power generation system comprising: a bus duct main line having a connection portion connected to the power transmission route by the bus duct connection structure according to any one of claims 1 to 8 .

  According to the present invention, the flexure of the flexible conductor of the bus duct connecting portion and the play structure of the connecting portion housing that allows it absorb the stress generated in the bus duct due to the swing including the vector in the direction perpendicular to the extending direction of the bus duct. And the shaking can be tolerated. Thereby, it is possible to install a bus duct that is resistant to shaking, and to achieve a wide range of installation of the bus duct. In particular, it is possible to accurately install the bus duct in the tower of the wind power generation system.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a first embodiment, and is an explanatory diagram of a wind power generation system including bus ducts connected using a bus duct connection structure according to the present invention.

  As shown in the figure, the wind power generation system 10 has a structure including a wind power generation device 14 at the top of a tower 12, and the wind power generation device 14 includes a rotor system including blades 16 that rotate by receiving wind. An electric system including a generator and power equipment associated therewith is provided, and a main part thereof is housed in the nacelle 18.

  In the lower part of the tower 12, a power conversion device 20 that performs necessary conversion of the generated power is installed, and an electric system installed in the nacelle 18 and the power conversion device 20 are electrically connected by a bus duct main line 22. Connected and transmitting power. The bus duct main line 22 is composed of a plurality (13 in this embodiment) of bus ducts 24, and each is connected by a connection portion 26.

  The bus duct main line 22 is arranged substantially vertically in the tower 12 as shown in the figure, and is supported by a plurality of support portions 28 provided at substantially equal intervals on the inner wall of the tower. These support portions 28 extend substantially horizontally from the inner wall of the tower toward the bus duct main line 22 to provide arm portions, and are configured to hold the bus ducts 24 at the end portions of the arm portions. In addition, each bus duct 24 is formed in substantially the same length, therefore, the bus duct connection part 26 is arrange | positioned at substantially equal intervals.

  Cable connection portions 30 and 32 are provided at both upper and lower ends of the bus duct main line 22, connected to the electrical system installed in the nacelle 18 via the upper cable connection portion 30, and connected to the power converter via the lower cable connection portion 32. 20 is connected.

  The characteristic of the present invention is that the wind power generation system 10 having such a configuration has a configuration for responding to the tower 12 having a height of several tens of meters being swayed by a wind or an earthquake, In the first embodiment, a predetermined number of connection portions (three in the first embodiment) among the plurality of bus duct connection portions 26 are configured as the stress absorbing connection structure portion 36 having a structure for allowing shaking. That is. In the present embodiment, the bus duct 24 is provided at every other three locations of the bus duct 24 in the upper position of the bus duct main line 22, that is, in the region where the swing width is large, but the number of installations is variously selected according to the height of the tower 12. If the tower 12 is low, not only a plurality of installations but also a single installation can function sufficiently.

  The stress absorbing connection structure 36 will be described with reference to the drawings. FIG. 2 is a plan view explanatory view of the stress absorbing connection structure 36 according to the first embodiment, FIG. 3 is a front view explanatory view thereof, and FIG. 4 is an exploded view showing each component member separately. Moreover, FIG. 5 is explanatory drawing for showing the connection structure of a normal bus duct as a reference.

  In the case of connection between the normal bus ducts 24, as shown in FIG. 5, one connection unit 40 is used, and the ends of the in-phase conductors 38 (for example, three-phase three-wires) of the bus duct 24 are butted together, for example. The fasteners 42 are configured to be fastened together with an insulating means interposed therebetween.

  On the other hand, as shown in FIGS. 2 and 3, the stress-absorbing connection structure portion 36, which is a characteristic configuration of the present invention, is provided between the ends of the three-phase three-wire substantially flat conductor 38 of the bus duct 24 on both sides. And the flexible conductor 50 are connected to each other. For this connection, two connection units 40-1 and 40-2 are provided, and a plurality of flexible conductors 50 having flexibility corresponding to each phase are electrically connected to the conductor 38. Yes. That is, the end portions of the insulation-coated conductors 38 protruding from the bus duct 24 are connected to both end portions of the respective flexible conductors 50.

  Each of the three conductors 38 loaded in the bus duct 24 is arranged in parallel with insulation coating and in close contact with each other, and the end portions to be connected are removed from the insulation coating and the conductor 38 is exposed. Each of the flexible conductors 50 is also covered with insulation, and both end portions are exposed with the insulation coating removed. Moreover, in the said embodiment, as understood from FIG. 3, the flexible conductor 50 in each phase is divided into two in the width direction of the conductor 38 and arranged in two stages, but this is not limitative. Instead, the size and number of the flexible conductors 50 are set corresponding to the current flowing in each phase of the conductor 38 loaded in the bus duct.

  The above-described stress absorbing connection structure portion 36 includes a connection portion housing 52, and the connection portion housing 52 includes a side plate 56 that covers the side surface of the flexible conductor 50 and a cover plate 58 that covers the upper and lower surfaces. 54 and a connection cover member that covers the connection portion of the flexible conductor 50 and the conductor 38 in the connection unit 40, and this connection cover member covers both side surfaces of the connection portion of the flexible conductor 50 and the conductor 38. It is composed of a duct side plate joint plate 60 (which is a connecting portion side plate) and a unit cover plate 62 (which is a connecting portion cover plate) which covers the upper and lower surfaces of the connecting portion between the flexible conductor 50 and the conductor 38.

  What is characteristic in the present embodiment is that the fixing structure of each member of the connecting portion housing 52 having these members has a structure that allows play of the flexible conductor 50. Hereinafter, the configuration of each member of the connection portion housing 52 will be described.

  The duct side plate joint plate 60 as a component of each connection unit 40-1 and 40-2 is fixed to the duct side plate 64 of the bus duct 24 with bolts 66 (see FIG. 2). In addition, each connection unit 40-1 and 40-2 can connect them by inserting the edge part of the conductor 38 and the edge part of the flexible conductor 50 between the duct side board joint plates 60 of these both sides. The conductive connecting member 68 and the substantially flat insulating separator 70 are installed so as to form an insertion space so that the insertion space can be formed.

  The connection portions of the connection units 40-1 and 40-2 are fixed together by a fastener in a state where the end portion of the flexible conductor 50 and the end portion of the conductor 38 of the bus duct are sandwiched between conductive connection members. It is concluded. Here, as shown in FIG. 3 and FIG. 4, two fasteners are provided corresponding to each of the flexible conductors 50 arranged in two stages in the conductor width direction. As shown, a bolt 72, a nut 74, and a disc spring 76 are provided.

  Next, the unit cover plate 62 as a constituent element of each connection unit 40-1 and 40-2 is provided to close the opening at the upper and lower surfaces of the conductor 38, that is, both ends in the width direction. As shown in FIG. 2, the unit cover plate 62 is attached on the bus duct 24 side so as to overlap the housing 80 of the bus duct 24 in plan view, and is attached to the bus duct housing 80 with a fixture such as a bolt and a nut. It is fixed.

  Next, the cover member 54 having the side plate 56 that covers the side surface of the flexible conductor 50 of the connection portion housing 52 and the cover plate 58 that covers the upper and lower surfaces is configured to have rigidity so as not to be easily deformed. A specific configuration of the cover member 54 is a pair of side plates 56 and a pair of lid plates 58 fixed to the upper and lower portions of the side plates 56. The side plates 56 are connected to the duct side plate joint of the connection unit 40 as shown in FIG. As shown in FIG. 2, the cover plate 58 is installed so as to have an overlapping portion that overlaps the unit cover plate 62 of the connection unit 40. That is, the cover member 54 is installed so as to cover the flexible conductor 50 and the ends of the connection units 40-1 and 40-2 on the flexible conductor 50 side. The side plate 56 and the cover plate 58 are made of sheet metal. Further, the duct side plate joint plate 60 and the unit cover plate 62 that are the connecting cover members are also configured to have rigidity.

  As shown in FIG. 2, the side plate 56 and the lid plate 58 are attached by bending inwardly a fixing portion 56 a for fixing the lid plate 58 to the end portion in the width direction of the side plate 56, as shown in FIG. 3. The fixing portion 56a is used with a bolt 84.

  In the present embodiment, an elastic member 86 (for example, a packing formed of rubber or the like) is inserted in an overlapping portion of the cover plate 58 of the cover member 54 and the unit cover plate 62 of the connection unit 40. In other words, the conductor 38 is provided over almost the entire thickness in the thickness direction so as to fill the gap in the overlapping portion. That is, the cover plate 58 is fixed to the side plate 56 while being separated from the unit cover plate 62 by the thickness of the compressed elastic member. The elastic member 86 is bonded to the lid plate 58 with a double-sided tape or an adhesive. For the installation of the elastic member 86, the side plate 56 and the cover plate 58 are fastened by the bolts 84 as spacers for separating the cover plate 58 from the unit cover plate 62 by the amount of the elastic member 86. And the nut 88 is interposed.

  Although not shown, an elastic member may also be provided between the duct side plate joint plate 60 of the connection unit 40 and the side plate 56 of the cover member 54.

  Next, the joint portion of the side plate 56 of the cover member 54 and the duct side plate joint plate 60 of the connection unit 40, that is, the structure of the support portion 100 will be described. First, as shown in FIG. 4, elongated holes 90 are formed at positions near both ends of the central portion of the side plate 56. On the other hand, a screwing hole 92 is formed in the vicinity of the end of the central portion of the duct side plate joint plate 60, and these end portions of the side plate 56 and the duct side plate joint plate 60 overlap each other in the installed state. A long hole 90 and a screw hole 92 are formed so that the holes overlap each other.

  FIG. 6 shows an enlarged view of the coupling structure of the support portion 100, that is, the portion of the long hole 90 and the screw hole 92. As shown in the drawing, a bolt 94 is screwed into a screw hole 92 provided in the duct side plate joint plate 60, and a spacer 96 having an outer diameter larger than that of the screw hole 92 on the bolt shaft of the bolt 94. And a nut 98 is screwed onto the bolt shaft with the spacer 96 interposed therebetween. The long hole 90 of the side plate 56 of the cover member 54 is formed so that the spacer 96 is inserted with a margin. The long hole 90 is formed to open long in the extending direction of the bus duct. That is, the cover member 54, which is a component of the connection portion housing 52, is also a component of the connection portion housing 52 through the elongated hole 90, and is coupled and coupled to the duct side plate joint plate 60 that covers the side surface of the connection unit 40. ing.

  Therefore, the side plate 56 can move in the conductor thickness direction within the range of the length of the spacer 96 while being connected to the duct side plate joint plate 60, and the opening range of the long hole 90 provided in the side plate 56. Can be tilted and moved in the conductor thickness direction. The movement range of the side plate 56 is ensured within a range in which the flexure due to various factors of the flexible conductor 50 can be allowed, and thereby the bus duct 24 can be shaken without breaking the housing. The stress absorbing connection structure 36 can absorb the stress.

  In the first embodiment, the support unit 100 also serves as a terminal block for connecting the terminal of the ground wire 102, and the duct side plate joint plates 60 of the connection unit 40 are electrically connected by the ground wire 102. is doing. Specifically, the terminal of the ground wire 102 is sandwiched between a nut 98 (washer) and a spacer 96 and is electrically connected to the duct side plate joint plate 60 via the support portion 100.

  That is, in this embodiment, the housing 80 of the bus duct 24 is used as the ground line of the bus duct trunk line 22, and the duct side bodies 64 of the housing 80 are connected to the duct side plate joint plate 60, the bolt 94 and the nut 98 ( The ground wire 102 is electrically connected via a washer.

  Thus, even if the cover member and the connecting cover member are attached with play, an earth line can be easily formed by simply connecting the support portions 100 fixed to the duct side plate joint plate 60 with the ground wire 102. can do.

  Regarding the configuration size of the stress absorbing connection structure portion 36 in the above embodiment, first, as understood from FIG. 3, the duct side plate joint plate 60 has a width substantially the same as the width of the bus duct housing 80 in the conductor width direction. Is formed. Therefore, when the connection unit 40 is connected, the connection unit 40 portion is substantially flush with the housing 80 of the bus duct 24 in the width direction, and the connection unit 40 portion projects in the conductor width direction. There is no. The duct side plate joint plate 60 is formed as a recessed duct side plate joint plate 60a having a substantially central region bent toward the inside of the duct, and the portion is fastened by the fastening member. Therefore, an increase in the size of the connection unit 40 in the thickness direction is avoided.

  On the other hand, as shown in FIG. 2, a convex region 56b that protrudes slightly outward is formed in the central region of the side plate 56 so as not to interfere with the bending operation of the flexible conductor 50. However, the outer surface of the convex region 56b is formed to be substantially flush with the surface of the housing 80 of the bus duct. Thus, the cover member 54 does not protrude much larger than the outer surface of the other bus duct housing 80 in plan view. Therefore, in the present embodiment, the stress absorbing connection structure portion 36 does not protrude further outward from the outer surface of the bus duct housing 80 in both side view and plan view. Thereby, when arranging a plurality of bus duct trunk lines in parallel, even if a stress absorbing connection structure is provided, the bus duct trunks can be prevented from interfering with each other at the stress absorbing connection structure.

  Next, a configuration and a connection process for connecting bus ducts using the bus duct connection structure according to the above embodiment will be described with reference to FIGS. 4 and 7. As shown in FIG. 4, the duct side plate joint plate 60 of the connection unit 40 and the side plate 56 of the cover member 54 have screwing holes for screwing or bolting that are necessary in the temporary fixing operation in the connection process. It is installed.

  The duct side plate joint plate 60 is provided with screw holes 104 at two places above and below the portion overlapping the side plate 56. On the other hand, the side plate 56 is provided with a screw hole 106 at a position overlapping the duct side plate joint plate 60 and at a position facing the screwing hole 104 in the installed state. A screw 107 for temporary fixing is inserted into the screw hole 104 and the screw hole 106, and the cover member 54 is temporarily fixed to the connection unit 40. The temporary fixing screw 107 is preferably a member that can be attached and removed without a tool (for example, a thumbscrew). Here, the screw hole 104 and the screw hole 106 of the duct side plate joint plate are formed so as to be positioned so that the bus ducts 24 are substantially aligned on a straight line when temporarily fixed. In this temporarily fixed state, the cover member 54 is fixed to the connection unit 40, and the bending operation of the flexible conductor 50 is maintained. Although the number of the screw holes 104 and the screw holes 106 is two in this embodiment, it is sufficient to form at least one to achieve the function of temporary fixing.

  Next, as a connection process, first, as shown in FIG. 7A, the connection unit 40 in a state in which the unit cover plate 62 is not attached is disposed at both ends of the flexible conductor 50, and the cover member 54 is provided. The side plate 56 and the duct side plate joint plate 60 of the connection unit 40 are temporarily fixed with a temporary fixing screw 107 such as a thumbscrew. Next, the bolts 72 and nuts 74 of the fasteners of the connection units 40-1 and 40-2 are loosened, and the bus ducts 24 to be connected on both sides are arranged to face each other with a predetermined distance. That is, the stress absorbing connection structure 36 is in a unitized state as a whole.

  Then, as shown in FIG. 7B, the end portions of the conductors 38 protruding from the end portions of the respective bus ducts 24 are inserted between the conductive connection members 68 between the insulating separators 70 of the connection unit 40, and the duct side plate 64. Is inserted into the gap between the outermost insulating separator 70 and the duct side plate joint plate 60. At this time, in each of the connection units 40-1 and 40-2, the edge of the duct side plate 64 of the bus duct 24 to be connected is placed on the step side portion of the recessed duct side plate joint plate 60 a formed on the duct side plate joint plate 60. It inserts until it contact | abuts, and it fixes with a volt | bolt, a screw, etc. using the hole for the bolt fastening or screwing formed in the duct side board joint plate 60 and the duct side board 64.

  Next, after fixing the unit cover plate 62 of the connection unit 40 to each bus duct 24 with the bolt 108, the cover plate 58 of the cover member 54 is fixed to the side plate 56 with the bolt 84. Next, the bolt 72 of the fastener of each connection unit 40 is tightened. In this state, the cover member 54 is fixed to the connection unit 40 with a temporary fixing screw 107 such as a thumbscrew, and the bending operation of the flexible conductor 50 is restricted. That is, in this state, the bus duct 24 on both sides of the stress absorbing connection structure portion 36 formed in the bus duct connection portion is restricted from moving in the orthogonal direction orthogonal to the axial direction of the bus duct. Therefore, in the laying operation of the bus duct main line, the displacement of the bus duct 24 in the stress absorbing connection structure portion in the orthogonal direction orthogonal to the axial direction of the bus duct can be prevented, and the construction operation can be facilitated.

  After the installation of the bus duct main line is completed, as shown in FIG. 7C, the temporary fixing screw 107 such as a thumbscrew is removed. As a result, the stress-absorbing connection structure portion is opened, and the function can be exhibited. That is, the flexible conductor 50 can be allowed to bend by the coupling structure having play between the cover member 54 and the connection unit 40 by the coupling structure of the side plate 56 and the duct side plate joint plate 60. As a result, it is possible for the stress absorbing connection structure 36 to absorb a shift between bus ducts including a vector component in a direction orthogonal to the bus duct extension direction due to the shaking of the bus duct 24.

  FIG. 8 shows a state where the bus duct connection structure according to the above embodiment is displaced in the conductor thickness direction. The side plate 56 of the cover member 54 is tilted in the thickness direction of the conductor 38 while moving within the range of the length of the spacer 96 and the long hole 90 described above while being connected to the duct side plate joint plate 60 of the connection unit 40. Since the bus ducts 24 arranged on both sides of the stress absorbing connection structure portion 36 are displaced relative to each other in the direction perpendicular to the bus duct extension direction (when displaced in the X1 and / or X2 direction in the figure), for example, This can be tolerated even when the tower of the wind power generation system is shaken.

  That is, the relative displacement is absorbed without causing the housing to be destroyed by the bending operation of the flexible conductor 50 and the displacement operation of each component member by the coupling structure having the play of the connecting portion housing 52 allowing the bending. be able to. In particular, since the side plate 56 has a long hole 90 that is long in the bus duct extending direction, the above function can be achieved while preventing the displacement of the bus duct 24 in a state without shaking. It also has a function of absorbing the expansion and contraction of the conductor 38 in the extending direction of the bus duct 24 by the length of.

  Next, FIG. 9 shows a state where the two bus ducts 24 are relatively displaced in the width direction of the conductor 38. In the figure, the side plate 56 of the cover member 54 and the duct side plate joint plate 60 of the connection unit 40 are supported by the support portion 100 which is the only connecting portion, that is, by the movement of the spacer 96 in the long hole 90. The relative rotation of the side plate 56 with respect to the duct side plate joint plate 60 can be allowed. Thereby, the position shift of the bus duct 24 on both sides in the Y1 direction and / or the Y2 direction can be allowed without breaking the housing. Further, even when the above-described misalignment between the bus ducts 24 occurs, the constituent members of the connection portion housing 52 have overlapping portions, so that the flexible conductor 50 is not exposed to the outside. Absent.

  Here, since the elastic member 86 is disposed in a compressed state at both ends of the cover plate 58 of the cover member 54, the cover plate 58 can be prevented from colliding with the unit cover body 62. Further, even when one elastic member 86 is further compressed and is in close contact with the plate, the other elastic member 86 is released from the compressed state and expands. Can be prevented in advance.

  As described above, according to the first embodiment, the bending operation of the flexible conductor 50 can be effectively allowed by each member coupling structure of the connection portion housing without a complicated configuration. In addition, absorption of the shaking operation of the bus duct main line by the flexible conductor 50 can be effectively achieved without causing an increase in size.

  Next, a second embodiment will be described based on FIG. In the present embodiment, the configuration different from that of the first embodiment is that the connection structure corresponding to the structure in which the connection between the flexible conductor and the bus duct conductor is not the mating type but the overlapping type. . FIG. 11 is a plan view showing a connection state in which the bus ducts 24 are connected to each other based on the second embodiment, and FIG. 11 also shows a front view structure thereof. In the figure, elements similar to those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  As shown in the figure, the connection between the conductor 38 of the bus duct and the flexible conductor 50 is performed by a so-called superposition method, which is different from the associating method in the first embodiment. That is, the end portions of the conductor 38 and the flexible conductor 50 are sandwiched between insulating separators, which are sandwiched between duct side plates and collectively fastened with a fastener. In the case of this configuration, since the size in the bus duct thickness direction is relatively large, the convex region 56b formed on the side plate 56 in the first embodiment is not formed. About the connection structure of each part with other play, it has the structure similar to the said embodiment, The function is also the same. In addition, the state which attached the component for temporary fix | stop is shown on the figure.

  12 and 13 show a third embodiment, FIG. 12 shows the bus duct connection structure in a plan view, and FIG. 13 also shows the bus duct connection structure in a front view. In the figure, elements similar to those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted. Further, in FIG. 12, the illustration of the insulating coated conductor, the flexible conductor, the insulating separator, the conductive connecting member, etc. is omitted for the sake of simplification of the drawing.

  In the first embodiment, the case where the support portion 100 is provided on the duct side plate joint plate 60 of the connection unit 40 has been described. However, in the third embodiment, the support portion 100 is connected to the unit cover plate 62 of the connection unit 40. This is provided on the cover plate 58 of the cover member 54. The elastic member 110 is provided between the duct side plate joint plate 60 of the connection unit 40 and the side plate 56 of the cover member 54. The configuration of the long holes 90, the spacers 96, and the like provided in the lid plate 58 are the same as in the above embodiment. Also in the third embodiment having such a configuration, the bus duct can be allowed to swing in either the width direction or the thickness direction of the bus duct 24 as in the first embodiment. Also in the third embodiment, an elastic member may be further provided between the unit cover plate 62 of the connection unit and the cover plate 58 of the cover member.

  FIG. 14 shows a fourth embodiment in which the bus duct connection structure according to the present invention is applied to a wind power generation system. In addition, the same code | symbol is shown to the element similar to the element shown in FIG. In the embodiment of the wind power generation system shown in FIG. 1, the case where the stress absorbing connection structure portions 36 that are bus duct connection structures according to the present invention are provided at substantially equal intervals has been described, but in the fourth embodiment, The installation interval of the stress absorbing connection structure 36 is varied.

  The amount of shaking of the tower 12 of the wind power generation system increases as it goes upward. Therefore, in the present embodiment, as shown in the drawing, the distances D1, D2, and D3 are arranged such that D1> D2> D3 in the upper region of the tower 12 and from the lower side toward the upper side. That is, the installation interval of the stress absorbing connection structure portion 36 is narrowed toward the top of the tower 12. Accordingly, a larger shaking motion absorbing function is intended to be exhibited in the upper portion where the shaking amount is large. With this configuration, protection from shaking of the bus duct main line is more effectively achieved.

  FIG. 15 shows a fifth embodiment. In the fourth embodiment, the case has been described in which the installation interval of the bus duct connection structure according to the present invention is narrowed toward the upper side of the tower 12, but in this embodiment, the constituent elements of the stress absorption connection structure portion are described. The length of the flexible conductor is longer as it goes upward of the tower 12, and the bending range is set wider.

  The length L1 of the flexible conductor 50 of the stress absorbing connection structure portion 36 shown in FIG. 11A is shorter than the length L2 of the flexible conductor 50 shown in FIG. As the length of the flexible conductor 50 is increased, the allowable range of misalignment between the connection bus ducts 24 due to the bending operation is increased. Therefore, among the bus duct connection structures connected in the vertical direction, the stress absorbing connection structure portion 36 of FIG. 10A is arranged on the lower side with small fluctuation, and the upper side of FIG. The stress absorbing connection structure 36 is arranged. Note that the length of the cover member 54 is also set corresponding to the length of the flexible conductor 50.

  Accordingly, by extending the length of the flexible conductor 50 toward the upper side, the allowable movement range of the bus duct 24 at a portion where the swing width of the tower 12 is large is widened, as in the fourth embodiment. Thus, it is possible to more accurately avoid the stress applied to the bus duct 24 and to effectively protect the bus duct main line. In such a case, it is necessary to adjust the play range in the connection housing corresponding to the difference in the flex range of the flexible conductor 50. The height and length of the spacer of the support portion 100 are increased toward the upper side of the tower 12. It is necessary to set a large hole length.

  FIG. 16 shows an example in which the bus duct connection structure according to the present invention is applied to a bent bus duct main line. In each of the above embodiments, the case where the bus duct main line is laid in a straight line has been described. However, in the present embodiment, a vertical portion and a horizontal portion are mixed in the bus duct main line.

  This figure is a front view explanatory view of a connection structure portion of a bent bus duct main line, and shows an example in which the bus duct connection structure according to the first embodiment is applied to this structure. As illustrated, the bus duct main line 200 is bent in an L shape at an intermediate position by an L-shaped bus duct 25. A stress absorbing connection structure 36 is disposed between the end of the conductor 38 of the L-shaped bus duct 25 and the end of the conductor 38 of the linear bus duct 24. That is, the bus duct trunk line 200 has a vertical portion and a horizontal portion, and a bus duct connection structure is disposed in the horizontal portion.

  When the vertical part of the bus duct main line 200 moves in the arrow Z direction, for example, when the conductor 38 in the vertical part of the bus duct main line 200 expands and contracts due to heat in the arrow Z direction, the stress absorbing connection structure 36 is Similarly to the state shown in FIG. 9 of the embodiment, the flexible conductor 50 bends, and this is allowed by the connection housing 52, and the misalignment between the bus ducts 24 can be absorbed. Therefore, even in the case of the bus duct main line having such a bent portion, it is possible to avoid applying excessive stress to the bus duct 24, and it is possible to protect the bus duct main line. It is also possible to arrange the bus duct connection structure in the vertical part of the bus duct main line to absorb the horizontal movement of the horizontal part of the bus duct main line.

  Although the present invention has been described based on the embodiments, the present invention is not limited to these configurations, and various modifications can be made within the scope of the gist of the invention. For example, it is sufficient for the coupling structure having the play between the cover member 54 and the connection unit 40 to have a play in both of them, and the specific structure can be variously selected.

  Further, the coupling structure having play is not necessarily provided between the housing members, and may be provided for coupling the connection portion housing and the housing portion of the bus duct.

  In the above embodiment, an example in which the flexible conductor 50 is covered with insulation has been shown. However, the present invention is not limited to this, and an insulating member having flexibility is interposed between the flexible conductors 50 to provide different phases. Alternatively, the flexible conductors 50 may be configured to maintain insulation.

  In each of the above embodiments, the stress absorption connection structure 36 is provided at the connection portion of the bus duct 24. However, the stress absorption connection structure 36 is separately formed at a location different from the connection position between the bus ducts 24. It is also possible to do.

  It should be noted that the bus duct connection structure of the present invention is not applied only to the wind power generation system, but can be applied to any situation as long as the bus duct main line is installed.

It is explanatory drawing of the wind power generation system to which the bus duct connection structure concerning this invention is applied. It is plane view explanatory drawing which shows the bus duct connection structure which concerns on 1st Embodiment. It is front view explanatory drawing which shows the bus duct connection structure which concerns on 1st Embodiment. It is a schematic exploded front view of the bus duct connection structure concerning a 1st embodiment. It is front view explanatory drawing which shows the normal connection state which has connected bus ducts using the connection unit. FIG. 3 is an enlarged plan view explanatory view of a support portion shown in the explanatory view of FIG. 2. It is explanatory drawing which shows the connection process of the bus ducts using the bus duct connection structure which concerns on this invention. It is a state explanatory view of the bus duct connection structure when the bus duct is displaced in the conductor thickness direction. It is a state explanatory view of the bus duct connection structure when the bus duct is displaced in the conductor width direction. It is planar view explanatory drawing which shows the connection state which connected bus ducts by the bus duct connection structure which concerns on 2nd Embodiment. It is front view explanatory drawing which shows the connection state which connected bus ducts by the bus duct connection structure of 2nd Embodiment. It is planar view explanatory drawing which shows the connection state which connected bus ducts with the bus duct connection structure of 3rd Embodiment. It is front view explanatory drawing which shows the connection state which connected bus ducts by the bus duct connection structure of 3rd Embodiment. It is explanatory drawing of the wind power generation system which concerns on 4th Embodiment. It is explanatory drawing which shows the connection state which connected bus ducts by the bus duct connection structure of 5th Embodiment. It is front view explanatory drawing which shows the structure applied to the bus duct trunk line which bent the bus duct connection structure which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Wind power generation system 12 Tower 14 Wind power generator 20 Power converter 24 Bus duct 36 Stress absorption connection structure part 40 Connection unit 50 Flexible conductor 52 Connection part housing 54 Cover member 56 Side plate 58 Cover plate 60 Duct side plate joint plate 62 Unit cover Plate 80 Bus duct housing 86 Elastic member 90 Long hole 96 Spacer

Claims (9)

In a bus duct connection structure that has a housing structure that can accommodate a conductor for power transmission inside and is connected to each other and installed at a desired length,
A connection part housing for accommodating the connection part between the bus ducts;
A flexible conductor that electrically connects the in-phase conductors in the connection portion housing;
Have
The connection portion housing is composed of a plurality of housing members,
The attachment of each housing member is an attachment structure with play in a range that allows the flexible conductor to bend ,
Each connection portion housing has a cover member that covers the flexible conductor, and a connection cover member that covers each connection portion between both ends of the flexible conductor and the conductor of the bus duct,
A bus duct connection structure characterized in that the connection between the cover member and the connecting cover member is an attachment structure with the play.   In a bus duct connection structure that has a housing structure that can accommodate a conductor for power transmission inside and is connected to each other and installed at a desired length,
  A connection part housing for accommodating the connection part between the bus ducts;
  A flexible conductor that electrically connects the in-phase conductors in the connection portion housing;
  Have
  The connection portion housing is composed of a plurality of housing members,
  The mounting of each housing member is a mounting structure in which the housing members are coupled with each other with play in a range allowing the flexible conductor to bend,
  The bus duct connection structure according to claim 1, wherein the attachment structure coupled with the play includes a play in a direction perpendicular to an extension direction of the bus duct.   The bus duct connection structure according to claim 2, wherein the coupling portion having the play is formed in the vicinity of a portion where the flexible conductor bends in the extending direction of the bus duct. 4. The bus duct connection structure according to claim 2, wherein the coupling portion having the play is provided on both ends of the flexible conductor. 5. The connection portion housing is
A cover member covering the flexible conductor;
A connecting cover member covering each connection portion between the end portion of the flexible conductor and the bus duct conductor;
The bus duct connection structure according to any one of claims 2 to 4, wherein the connection structure between the cover member and the connecting cover member is an attachment structure with play. The cover member is
A side plate covering the side surface portion of the flexible conductor, and a lid plate covering the upper and lower surface portions,
The connecting cover member is
A connecting portion side plate that covers the side surface portion of the connection portion between the end portion of the flexible conductor and the conductor of the bus duct, and a connecting portion cover plate that covers the upper and lower surface portions,
The mounting structure with the play is
Between the side plate and the connecting portion side plate of the cover member, or, according to claim 1 or 5, characterized in that formed on at least one between the connecting portion cover plate and cover plate of said cover member Bus duct connection structure. The mounting structure with the play is
Either one of the cover member or the connecting cover member is provided with a long hole extending in the bus duct extending direction, and the other is provided with a fastening member that can be inserted with a margin into the long hole and with a play in the tightening direction of the fastening member. bus duct connection structure according to any one of claims 1, 5 or 6, characterized in that it is constituted by providing a spacer for. The connection cover member and the cover member is in the final installed condition has a overlapping portion overlapping each other, the heavy Nari portion of claim 1, 5, 6 or 7, characterized in that by interposing an elastic member The bus duct connection structure according to any one of the above. In the wind power generation system comprising a wind power generator at the top of the tower and transmitting the power generated by the wind power generator downward,
A wind power generation system comprising: a bus duct main line having a connection portion connected to the power transmission route by the bus duct connection structure according to any one of claims 1 to 8 .

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