JP6406963B2 - Current collection box for solar power generation system - Google Patents

Description

  The present invention relates to a current collection box used in a solar power generation system.

  In a solar power generation system, a solar cell facility composed of a solar cell panel or a string is connected to a power conditioner via a current collection box. As shown in Patent Document 1, in this current collection box, a plurality of branch switches connected to each of a plurality of solar cell facilities, a backflow prevention diode module connected to the positive electrode, and a backflow prevention diode A positive electrode bar connected via the module, a negative electrode bar connected to the other pole of the branch switch, and a current collecting switch connected to the positive electrode bar and the negative electrode bar are housed.

  A conventional backflow prevention diode module of a current collection box is formed by arranging connection terminals that can connect a plurality of electric wires connected to the positive terminal portion of the branch switch in the left-right direction inside the housing. As described above, since the connection terminals are in the horizontal direction, there is a problem that when a plurality of backflow prevention diode modules are installed side by side, the housing of the current collection box becomes large in the left-right direction.

  In order to solve this problem, it is possible to arrange a backflow prevention diode module in the vertical direction. However, since the heat generated from the backflow prevention diode module moves upward, another backflow prevention diode module is placed directly above. Then there is a risk of heat transfer. For this reason, the staggered arrangement is also adopted in Patent Document 1, but in this case, the casing has to be enlarged not only in the width direction but also in the vertical direction.

  In addition, when the backflow prevention diode modules are arranged in a staggered manner, the distance between the branch switch and the backflow prevention diode module is different, so that a structure using a lead bar rather than a lead bar is used, which reduces wiring workability and increases assembly man-hours. There was also a problem.

JP 2003-149766 A

  Accordingly, an object of the present invention is to solve the above-described conventional problems, to provide a current collection box for a photovoltaic power generation system that enables downsizing of a housing and facilitates wiring work.

The present invention made in order to solve the above-mentioned problems, on the device mounting plate, a plurality of branch switches that open and close the electric circuit of the plurality of solar cell modules, the wiring of the terminal portion of the branch switch and the positive bar In a current collection box for a photovoltaic power generation system having a plurality of backflow prevention diode modules having a plurality of connection terminals to which wiring is connected, a backflow prevention diode module is arranged for each of two branch switches, and each backflow prevention diode module A plurality of connection terminals are arranged in the vertical direction of the housing, the wiring from one branch switch is connected to the connection terminal from the vertical direction of the housing, and the wiring from the other branch switch is connected to the vertical direction of the housing It is characterized by being connected from a different angle . Note that, as in claim 2, the center line of the plurality of connection terminals of the backflow prevention diode module and the center line of the terminal part of one branch switch can be arranged on the same straight line.

Further, the invention of claim 3 made to solve the above-mentioned problems is that a plurality of branch switches for opening and closing electric paths of a plurality of solar cell modules, wiring of terminal portions of the branch switches, In a current collection box for a photovoltaic power generation system provided with a plurality of backflow prevention diode modules having a plurality of connection terminals to which wiring to the positive electrode bar is connected, the backflow prevention diode modules are arranged for each of two branch switches, A plurality of connection terminals of the backflow prevention diode module are arranged in the vertical direction of the casing, and all the wirings from the branch switches are connected from an angle different from the vertical direction of the casing. Furthermore, as in claim 4 , the positive electrode bar extends in a direction different from the vertical direction of the housing, and can be structured to connect so as to pass connection terminals of a plurality of backflow prevention diode modules.

  In the current collection box for the photovoltaic power generation system of the present invention, since the plurality of connection terminals of the backflow prevention diode module are arranged in the vertical direction of the casing, the internal devices can be arranged densely, and the small size of the casing Can be achieved. In addition, since the wiring from the branch switch is connected to these connection terminals from an angle different from the vertical direction of the housing, wiring work is easy.

Moreover, since so as to place the blocking diode module for every two branching switches, will be placed at regular intervals, it can be two types of the type in case of using the lead bar. Furthermore, if the structure of Claim 4 is employ | adopted, since a positive electrode bar can be connected so that the connection terminal of a several backflow prevention diode module may be passed, it can aim at reduction of the number of wiring, and a housing | casing is also reduced in size. can do.

It is an external appearance perspective view of a current collection box. It is a front view of an internal device which removes and shows a cover. It is an enlarged front view of the principal part. It is a perspective view of a backflow prevention diode module. It is an expansion perspective view of an internal structure. It is a side view of an internal structure. It is a perspective view of a positive electrode lead bar. It is a perspective view which shows other embodiment. It is a perspective view which shows other embodiment. It is a front view which shows other embodiment.

Embodiments of the present invention will be described below.
FIG. 1 is an external perspective view of a current collection box for a photovoltaic power generation system, where 1 is a housing of the current collection box, 2 is a door, and 3 is a number of branch switches. In FIG. 1, since the internal device of the housing is covered with the cover 4, only the handle portion of the branch switch 3 is exposed from the window hole of the cover 4.

  FIG. 2 is a front view showing a state in which the cover 4 is removed and the internal device is removed from the housing 1. Reference numeral 5 denotes an iron-based device mounting plate vertically arranged inside the housing 1, and a number of branch switches 3 are arranged in close contact with the device mounting plate 5 in the lateral direction as shown in the figure. These branch switches 3 are formed for each solar cell module (not shown). The solar cell module is a string of solar cells (in which solar cells are connected in series) or a single solar cell panel. The wiring of each solar cell module is connected to the lower terminal of the branch switch 3. These branch switches 3 have a role of opening and closing the electric paths of the plurality of solar cell modules.

  Above the branch switch 3, a positive electrode bar 6 and a negative electrode bar 7 are provided in the horizontal direction (left-right direction). These are fixed on the device mounting plate 5 with an insulation distance by a bar holder 8 or the like. The current generated by the solar cell module is finally collected in the positive electrode bar 6 and the negative electrode bar 7 and supplied to a current collecting switch (not shown) through a current collecting cable 25 shown at the right end of FIG. In the present embodiment, the current collecting switch is formed outside the housing 1, but the current collecting switch may be formed in the housing instead of the current collecting cable 25. However, since the electromotive force of the solar cell module fluctuates greatly according to the sunshine condition, there is a possibility that a reverse power flow from the system occurs when the electromotive force decreases. Therefore, a backflow prevention diode module 9 is disposed between the branch switch 3 and the positive bar 6.

  As shown in FIG. 4, the backflow prevention diode module 9 has a structure like a terminal block, in which a backflow prevention diode is housed. One backflow prevention diode module 9 is arranged for every two branch switches 3 and is arranged at equal intervals at the same height position. For this reason, a gap 19 is formed between the adjacent backflow prevention diode modules 9. Since the backflow prevention diode module 9 generates a large amount of heat, the air gap 19 can prevent heat transfer through the space of the adjacent backflow prevention diode module 9. Since the staggered arrangement as in Patent Document 1 is not employed, the branch switch 3 and the backflow prevention diode module 9 are all formed at the same predetermined interval, so that the types of lead bars described later can be reduced. .

  In this embodiment, three connection terminals 10, 11, 12 are provided on the upper surface of each backflow prevention diode module 9, and these connection terminals 10, 11, 12 are arranged in the vertical direction of the casing. The upper connection terminal 10 is a connection terminal for the positive electrode bar 6, and the positive electrode bar 6 is directly connected as a wiring. The connection terminal 10 serves as an output terminal for connection terminals 11 and 12 to be described later. In addition, although it is also possible to connect an electric wire as a wiring to the connection terminal 10, by connecting the positive electrode bar 6 as a direct wiring, the electric wire can be omitted and the efficiency of wiring work can be improved. Moreover, since no wiring space is required, the vertical size of the housing can be reduced. As shown in FIG. 2, the positive electrode bar 6 is connected across a plurality of backflow prevention diode modules.

  The middle and lower connection terminals 11 and 12 of each backflow prevention diode module 9 are the positive terminals 13 and the input terminals to which the positive lead bars 14 and 15 are connected among the upper terminals of the branch switch 3. Is connected to the above-described backflow prevention diode. As shown in FIG. 3, the positive terminal 13 of the branch switch 3 on one side (left side) is connected to the lower connection terminal 12 by the positive lead bar 14, but the positive terminal of the branch switch 3 on the opposite side (right side). The terminal 13 is connected to the middle connection terminal 11 from a different angle from the vertical direction of the housing 1 by positive electrode lead bars 15 having different shapes.

  The shapes of these positive electrode lead bars 14 and 15 are as shown in FIGS. 5 to 7, and both are bent in the middle toward the device mounting plate 5. Not bent. That is, the center line of the lower connection terminal 12 connected by the positive electrode lead bar 14 and the center line of the positive terminal 13 of the branch switch 3 on one side (left side) are substantially the same. On the other hand, the tip of the positive electrode lead bar 15 is bent in the left-right direction, and is connected to the middle connection terminal 11 from the left-right direction. With this structure, the positive terminal 13 of each branch switch 3 arranged in close contact as shown in FIG. 5 is connected to the middle and lower connection terminals 11 and 12 of each backflow prevention diode module 9 between the positive lead bars 14 and 15. Can be connected with a gap that can ensure insulation.

  On the other hand, the negative terminal 16 of the upper terminals of the branch switch 3 is not directly connected to the negative bar 7 by the negative lead bar 17 shown in FIGS. . The connection terminal 18 of the negative electrode lead bar 17 is positioned between the positive electrode lead bars 14 and 15 so that it can be easily screwed. Further, as shown in FIG. 6, the height from the device mounting plate 5 is changed to ensure an insulation distance between the positive lead bars 14 and 15. The branch switch 3 has a height from the device mounting plate 5 secured by the fixture 18.

  As described above, since the backflow prevention diode module 9 generates a large amount of heat, it is arranged with a gap 19 formed between them. However, as shown in FIG. Is preferably formed. In order to prevent heat transfer through the device mounting plate 5 between the backflow prevention diode modules 9 and 9, the slit 20 is preferably equal to or longer than the vertical length of the backflow prevention diode module 9.

  In the embodiment described above, a large number of branch switches 3 and backflow prevention diode modules 9 are arranged on one device mounting plate 5. However, as shown in FIGS. 8 and 9, the unit mounting plate 21 can be used and disposed on the mounting rail 22. In this embodiment, four branch switches 3 and two backflow prevention diode modules 9 are mounted on a unitized device mounting plate 21. A gap 19 is formed between the adjacent device mounting plates 21, 21, but a slit 20 is formed between the two backflow prevention diode modules 9, 9 mounted on the same device mounting plate 21. Absent.

  In the structures of FIGS. 8 and 9, when a plurality of similar units are arranged in the left-right direction of the housing 1, the width of the space 30 is formed between adjacent units. With such a configuration, it is possible to provide the space 30 for suppressing heat transfer between the backflow prevention diode modules 9 only by installing the unit at a predetermined mounting position. In addition, after attaching such a unit, the linear positive electrode lead bar 14, the positive electrode lead bar 15 whose tip is refracted, the negative electrode lead bar 17, and the other positive electrode bar 6 and negative electrode bar 7 are attached. It is attached so that a plurality of units can be delivered.

  In another embodiment shown in FIG. 10, the tips of the positive lead bars 23 and 24 for connecting the upper positive terminal 13 of the branch switch 3 to the middle and lower connection terminals 11 and 12 of the backflow prevention diode module 9 are provided. It is bent in the opposite direction. That is, the right positive lead bar 23 connected to the middle connection terminal 11 of the backflow prevention diode module 9 is bent to the left at the tip, and the right positive lead bar 24 connected to the lower connection terminal 12 is directed to the right. Is bent. For this reason, all wiring from each branch switch 3 is connected from an angle different from the vertical direction of the housing 1. With this structure, the positive lead bars 23 and 24 can be accommodated within the width in the left-right direction of the backflow prevention diode module 9. Moreover, the operation | work which connects the negative electrode terminal 16 of the branch switch 3 to the negative electrode lead bar 17 becomes easy.

  As described above, the current collection box for the photovoltaic power generation system of the present invention can arrange internal devices densely, can reduce the size of the housing, and is excellent in wiring workability. There are advantages.

DESCRIPTION OF SYMBOLS 1 Case 2 Door 3 Branch switch 4 Cover 5 Equipment mounting plate 6 Positive electrode bar 7 Negative electrode bar 8 Bar holder 9 Backflow prevention diode module 10 Upper connection terminal 11 Middle connection terminal 12 Lower connection terminal 13 Positive terminal 14 Positive electrode lead bar 15 Positive electrode lead bar 16 Negative electrode terminal 17 Negative electrode lead bar 18 Connection terminal 19 Gap portion 20 Slit 21 Unitized device mounting plate 22 Mounting rail 23 Positive electrode lead bar 24 Positive electrode lead bar 25 Current collecting cable 30 Space portion

Claims (4)

A backflow prevention diode having a plurality of branch switches for opening and closing electric paths of a plurality of solar cell modules, and a plurality of connection terminals to which wiring of terminal portions of the branch switches and wiring to a positive electrode bar are connected on a device mounting plate In the current collection box for solar power generation systems with multiple modules,
A backflow prevention diode module is arranged for each of the two branch switches, a plurality of connection terminals of each backflow prevention diode module are arranged in the vertical direction of the housing, and wiring from one branch switch is arranged in the vertical direction of the housing A collector box for a photovoltaic power generation system, characterized in that it is connected to a connection terminal, and wiring from the other branch switch is connected from an angle different from the vertical direction of the housing . The collection for a photovoltaic power generation system according to claim 1, wherein a center line of a plurality of connection terminals of the backflow prevention diode module and a center line of a terminal portion of one branch switch are arranged on the same straight line. Electric box. A backflow prevention diode having a plurality of branch switches for opening and closing electric paths of a plurality of solar cell modules, and a plurality of connection terminals to which wiring of terminal portions of the branch switches and wiring to a positive electrode bar are connected on a device mounting plate In the current collection box for solar power generation systems with multiple modules,
A backflow prevention diode module is arranged for each of the two branch switches, a plurality of connection terminals of each backflow prevention diode module are arranged in the vertical direction of the housing, and all wiring from each branch switch is arranged in the vertical direction of the housing. Is a collector box for solar power generation system , characterized by being connected from different angles . 4. The solar light according to claim 1, wherein the positive electrode bar extends in a direction different from the vertical direction of the housing and is connected so as to pass connection terminals of a plurality of backflow prevention diode modules. Current collection box for power generation system.

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