JP7097053B2 - Solar panel maintenance and inspection connection equipment - Google Patents

Description

The present invention relates to a connector positioned between the electrical path connecting the solar cell string and the power conditioner and having a signal extraction point for measuring the characteristics of the solar cell panel, a junction box including the connector, and a junction box containing the connector. It relates to a power conditioner including the connection device.

An IV curve analysis method for monitoring the power generation status of a solar cell panel has been proposed (see, for example, Patent Document 1).

Further, conventionally, as maintenance and inspection of a solar cell panel, characteristics such as power generation state and impedance in a solar cell string are measured by using an IV curve measuring device or an impedance measuring device. In these measurement operations, the string wire connector of the solar cell string is removed from the input end of the junction box or the input end of the power conditioner, and the connector is brought into contact with the signal input device of the measuring device.

Such measurements are made, for example, semi-annually.

A device having a function of bundling a plurality of strings in parallel and a circuit opening / closing function is generally called a junction box (or a connection unit), and a device having a DC AC conversion function and a device having a DC AC conversion function and a plurality of strings are arranged in parallel. A device having a function of bundling a current and an opening / closing function of a circuit is generally called a power conditioner. These names are also used in the present invention and the present specification.

The junction box and the power conditioner may have a backflow prevention diode.

Japanese Unexamined Patent Publication No. 2016-93048

It is not easy to bring a signal input device such as a socket or a test lead into contact with the string wire connector and maintain the contact state during the measurement period. This is because the string wire connector has a structure that avoids the exposure of the terminal, so it is difficult to contact the signal input device with the terminal.

Further, since the string wire connector and the signal input device are not fixed to each other, they move easily and it is difficult to maintain the contact state. Further, since the IV curve measurement, which is one of the measurement items, is performed during the power generation of the solar cell panel, the above contact must be performed under energization, and tension is forced during the work.

Therefore, it is an object of the present invention to obtain a connection device, a connection box and a power conditioner that solve these difficulties. Other problems of the present invention will be clarified by the description of the present invention.

The means for solving the problem are described below. In order to facilitate understanding, the present invention will be described with reference numerals corresponding to the embodiments of the present invention, but the present invention is not limited to the embodiments. In addition, a number as a code may collectively indicate a part or the like, and in some examples described later, when an individual part or the like is indicated, an alphabetical subscript is added after the number.

The connection device according to one aspect of the present invention is a connection device located between the solar cell string and the electric path connecting the power conditioner, in which the lead wire 24, the input connector 21 conducting the lead wire, and the lead wire are conducted. It has an output terminal 22 and a signal device receiver 26 that is conductive to the lead wire.

The connector according to a preferred embodiment of the present invention is a connector in which an output connector is connected to the output end. Such connecting devices can be very easily positioned on the input side of an existing junction box or existing power conditioner. In this way, it is possible to easily install an inspection point having excellent usability.

In the connecting device according to another preferred embodiment of the present invention, the signal device receiver is either a test lead receptacle or a socket. These signal fixture receivers are suitable for permanent inspection points because the electrodes are inside the receiver and the electrodes are not exposed to the outside. For this reason, these connecting devices are even more suitable as permanent solar cell equipment. Further, it has an advantage that it is compatible with a probe that is widely used as a probe for measuring equipment such as IV curve measuring equipment.

The junction box according to another aspect of the present invention is a junction box located between the solar cell string and the electric circuit connecting the power conditioner, and comprises the connection device and the switch according to the present invention, and the connection device according to the present invention. The output end and the input circuit end of the switch are connected.

In a junction box according to a preferred embodiment of the present invention, the signal appliance receiver of the connector is either a test lead receptacle or a socket. These signal fixture receivers are suitable for permanent inspection points because the electrodes are inside the receiver and the electrodes are not exposed to the outside. For this reason, these junction boxes are even more suitable as permanent solar cell equipment. Further, it has an advantage that it is compatible with a probe that is widely used as a probe for measuring equipment such as IV curve measuring equipment.

The power conditioner according to another aspect of the present invention comprises an output line connection mechanism, a switch and a DC AC converter, and is a power conditioner that receives DC power output from a solar cell string and outputs AC power. The wire connection mechanism is the connection device according to claim 1, wherein the output end of the connection device and the input circuit end of the switch are connected.

In the power conditioner according to the preferred embodiment of the present invention, the signal device receiver of the connection device is either a test lead receptacle or a socket. In the power conditioner according to the preferred embodiment of the present invention, the signal device receiver of the connection device is either a test lead receptacle or a socket. These signal fixture receivers are suitable for permanent inspection points because the electrodes are inside the receiver and the electrodes are not exposed to the outside. For this reason, these junction boxes are even more suitable as permanent solar cell equipment. Further, it has an advantage that it is compatible with a probe that is widely used as a probe for measuring equipment such as IV curve measuring equipment.

The present invention described above, preferred embodiments of the present invention, and components contained therein can be combined as much as possible.

Since the connecting device according to the present invention has a signal device receiver, it is easy and reliable to contact the signal input device of the measuring device and the output wire of the solar cell string and maintain the contact state together with other matters specifying the invention. Become. Therefore, the measurement worker can freely move both hands during the measurement. Therefore, the measurement work such as the operation of the measuring device becomes easy, and the work efficiency is improved.

Further, since the junction box according to the present invention has a signal device receiver, it is easy to contact the signal input device of the measuring device and the output wire of the solar cell string and maintain the contact state together with other specific matters of the invention. It will be certain. Therefore, the measurement worker can freely move both hands during the measurement. Therefore, the measurement work such as the operation of the measuring device becomes easy, and the work efficiency is improved. In addition, since the signal device receiver is permanently installed, the above-mentioned facilitation of measurement work is always brought about.

Furthermore, since the power conditioner according to the present invention has a signal device receiver, it is easy to contact and maintain the contact state between the signal input device of the measuring device and the output wire of the solar cell string together with other specific matters of the invention. And it will be certain. Therefore, the measurement worker can freely move both hands during the measurement. Therefore, the measurement work such as the operation of the measuring device becomes easy, and the work efficiency is improved. In addition, since the signal device receiver is permanently installed, the above-mentioned facilitation of measurement work is always brought about.

FIG. 1 is a perspective view of a connecting device. FIG. 2 is a cross-sectional view of the connecting device, and shows a cross-sectional view shown by AA in FIG. FIG. 3 is a cross-sectional view of the connecting device, and shows a cross-sectional view shown by BB in FIG. FIG. 4 is a perspective view showing a mode in which a string wire and a connecting cable are connected to a connecting device. FIG. 5 is a plan view of the junction box. FIG. 6 is a plan view of the power conditioner.

Hereinafter, the connection device, the junction box, and the power conditioner for photovoltaic power generation according to the embodiment of the present invention will be further described with reference to the drawings. In order to facilitate the understanding of the present invention, some of the figures referred to in the present specification are schematically shown by exaggerating some of the components. Therefore, the dimensions and ratios between the components may differ from the actual product. Further, the dimensions, materials, shapes, relative positions, etc. of the members and parts described in the examples of the present invention are not intended to limit the scope of the present invention to those, unless otherwise specified. It is just an example of explanation.

1 is a perspective view of the connecting device 1, FIG. 2 is a cross-sectional view of the connecting device 1, a cross section shown by AA in FIG. 1 is shown, and FIG. 3 is a cross-sectional view of the connecting device 1. Yes, the cross section shown by BB in FIG. 1 is shown.

The connecting device 1 has a positive electrode input connector 21 which is an input connector on the left side surface of the housing 10, a positive electrode lead receptacle 26 which is a signal device receiver on the upper surface, and a positive electrode output connector 23 which is an output connector on the right side surface. The positive electrode input connector 21, the positive electrode lead receptacle 26, and the positive electrode output connector 23 are components of the positive electrode circuit in the connector 1.

With reference to FIG. 2, the positive electrode circuit has a positive electrode lead line 24 which is a lead line. The positive electrode input connector 21 is conductive with the positive electrode lead wire 24. The positive electrode output end 22 which is the output end is conducting with the positive electrode lead wire 24.

The positive electrode output connector 23 is connected to the positive electrode output end. The positive electrode lead line 24 has a positive electrode branch point 25. The positive electrode lead receptacle 26, which is a signal device receiver, is connected to the positive electrode branch point 25. The positive electrode lead wire 24 and the positive electrode lead receptacle 26 are conducting.

Further, the connecting device 1 has a negative electrode input connector 31 which is an input connector on the left side surface of the housing 10, a negative electrode lead receptacle 36 which is a signal device receiver on the upper surface, and a negative electrode output connector 33 which is an output connector on the right side surface. The negative electrode input connector 31, the negative electrode lead receptacle 36, and the negative electrode output connector 33 are components of the negative electrode circuit in the connector 1.

With reference to FIG. 3, the negative electrode circuit has a negative electrode lead line 34 which is a lead line. The negative electrode input connector 31 is conductive with the negative electrode lead wire 34. The negative electrode output end 32, which is the output end, is conductive with the negative electrode lead wire 34.

The negative electrode output connector 33 is connected to the negative electrode output end. The negative electrode lead line 34 has a negative electrode branch point 35. The negative electrode lead receptacle 36, which is a signal device receiver, is connected to the negative electrode branch point 35. The negative electrode lead wire 34 and the negative electrode lead receptacle 36 are conducting.

A set of circuits consisting of a single positive electrode circuit and a single negative electrode circuit corresponds to a single solar cell string output. The connector 1 shown in FIG. 1 has two positive circuit circuits and two negative electrode circuits, and is compatible with two rows of solar cell string outputs. In order to support a large number of solar cell strings, a plurality of connecting devices 1 shown in FIG. 1 may be used, or a large number of positive electrode circuits and a large number of negative electrode circuits may be attached to a single housing.

The signal device receiver is not limited to the test lead receptacle, and for example, a socket (for example, a socket that accepts a banana plug), a test lead, various plugs, various clips, and the like may be used. Of these, test lead receptacles and sockets are preferred. This is because the electrical contact end of the measuring instrument receiver is not exposed.

The connecting device 1 has a usage mode of being attached to the circuit of the solar cell power generation only during the execution period of the characteristic measurement of the solar cell string. Further, the connecting device 1 may be used to be attached to the circuit of the solar cell power generation not only during the characteristic measurement execution period but also during the period when the measurement is not performed. In the latter use mode, it is particularly preferable to use a measuring instrument receiver in which the electrical contact end is not exposed.

The usage mode of the connecting device 1 will be described with reference to FIG. FIG. 4 is a perspective view showing a mode in which a string wire and a connecting cable are connected to a connecting device.

The positive electrode string wire 28 is connected to the positive electrode connector 21 via the connector 27. The negative electrode string wire 38 is connected to the negative electrode input connector 31 via the connector 37.

The positive electrode connecting cable 17 is connected to the positive electrode output connector 23 via the connector 16. The negative electrode connecting cable 19 is connected to the negative electrode output connector 33 via the connector 18.

The other end of the positive electrode connecting cable and the other end of the negative electrode connecting cable are connected to a junction box or a power conditioner.

The positive electrode test lead, which is a signal device of a solar cell characteristic measuring device (IV curve measuring device, impedance measuring device, etc.), is connected to the positive electrode test lead receptacle 26, and the negative electrode test lead, which is a signal device, is connected to the negative electrode test lead receptacle 36. And measure the characteristics.

The junction box 4 according to the present invention will be described. FIG. 5 is a plan view of the junction box 4.

The connection box 4 has a housing 40, a connection device 1, switches 41a and 41b, a terminal block 44, and the like.

The connecting device 1 is the same as the connecting device 1 according to the present invention described with reference to FIG. The positive electrode output end 22 which is the output end is connected to the positive electrode input circuit end 46 which is the input circuit end of the switch 41a. The negative electrode output end 32, which is the output end, is connected to the negative electrode input circuit end 47, which is the input circuit end of the switch 41a.

One of the two output ends of the switch 41a is connected to the positive electrode lead wire 42, and the other is connected to the negative electrode lead wire 43.

The positive electrode lead wire 42 and the negative electrode lead wire 43 are connected to the terminal block 44, and the DC plurality output connector 45 is connected to the terminal block 44.

In the junction box 4, the inputs from the two series of solar cell strings are bundled into one series and output from the DC multiple output connector 45.

That is, the circuit entering from one positive electrode input connector 21a and the other positive electrode input connector 21b is connected to the positive electrode lead wire 42, and the circuit entering from one negative electrode input connector 31a and the other negative electrode input connector 31b is connected to the negative electrode lead wire 43. There is.

The junction box may also have a backflow prevention diode.

The power conditioner 7 according to the present invention will be described. FIG. 6 is a plan view of the power conditioner 7.

The power conditioner 7 has a housing 50, a DC / AC converter 51, and the like.

In the configuration of the power conditioner 7, the parts from the input connectors 21 and 31 to the terminal block 44 via the switch 41 and the connection mode thereof are the junction box 4 according to the present invention described with reference to FIG. It is the same.

In the power conditioner 7, the terminal block 44 and the DC / AC converter 51 are connected to each other via the double-track lead wire 53. The AC electricity exiting the DC-AC converter 51 is output from the AC output connector 52.

The power conditioner may also have a backflow prevention diode.

Although one embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration example is not limited to this one embodiment, and the design change is not deviated from the gist of the present invention. Even if there is such a thing, it is included in the present invention.

1 Connection device 4 Connection box
7 Power conditioner 10 Housing 16 Connector 17 Positive connection cable 18 Connector 19 Negative connection cable 21 Positive input connector that is an input connector 22 Positive output end that is an output end 23 Positive output connector that is an output connector 24 Positive lead line that is a lead line 25 Positive branch point 26 Positive positive test lead receptacle 27 connector 28 Positive string wire 31 Negative input connector that is an input connector 32 Negative output end that is an output end 33 Negative output connector that is an output connector 34 Lead wire Negative lead wire 35 Negative branch point 36 Negative test lead receptacle 37 connector 38 Negative string wire 40 Housing 41 Switch 42 Positive lead wire 43 Negative lead wire 44 Terminal stand 45 DC multiple output connector 46 Input circuit end Positive input circuit end 47 Negative input circuit end, which is the input circuit end 50 Housing 51 DC AC converter 52 AC output connector 53 Double wire lead wire

Claims (2)

In the connection equipment for maintenance and inspection of the solar cell panel , which is positioned between the solar cell string and the electric path connecting the existing power conditioner and is electrically connected to the input side of the existing junction box .
Lead line and
An input connector that is conductive to the lead wire and can be connected to the string wire of the solar cell string ,
An output connector connected to the output end that is conductive to the lead wire,
A signal device receiver that is conductive to the lead line ,
It has a housing arranged on the outer surface with at least the signal device receiver exposed .
The signal device of the solar cell characteristic measuring device can be connected to the signal device receiver.
The other end of the connecting cable whose one end is connected to the existing junction box is configured to be connectable to the output connector.
The mode of using the solar cell string by positioning it in the electric path only during the characteristic measurement execution period of the solar cell string, and the electricity during the characteristic measurement execution period of the solar cell string and the period during which the characteristic measurement of the solar cell string is not performed. A connection device for maintenance and inspection of a solar cell panel , which is configured so that it can be positioned in a path and used in a selectable manner . The connection device for maintenance and inspection of a solar cell panel according to claim 1, wherein the signal device receiver is either a test lead receptacle or a socket.

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