JP2018033210A - Circuit breaker and photovoltaic generation monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circuit breaker and a photovoltaic generation monitoring system that reduce energy loss due to backward current and thereby can save space and wiring.SOLUTION: A circuit breaker 4 includes: a first connection terminal 11A; a second connection terminal 12A; an electric circuit 13A for electrically connecting between the first and second connection terminals 11A, 12A in order to make forward current flow from the first connection terminal 11A to the second connection terminal 12A; a switch 21 for switching the electric circuit 13A; a current measuring unit 22 (backward current detection unit) for detecting backward current provided on the electric circuit 13A for detecting backward current flowing from the second connection terminal 12A to the first connection terminal 11A; a communication unit 24 for receiving, from the outside, a circuit open command signal to open the electric circuit 13A; and a control unit 25 for controlling the switch 21. The control unit 25 controls the breaker 21 to open the electric path 13A when the current measuring unit 22 detects backward current or when the communication unit 24 receives a circuit open command signal.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electric circuit breaker capable of electrically connecting and disconnecting an electric circuit, and a photovoltaic power generation monitoring system using the electric circuit breaker.

  Generally, a photovoltaic power generation system connects a plurality of solar cell strings that receive light to generate electrical energy, a power conditioner that converts electrical energy into predetermined power, and a solar cell string and a power conditioner. And a switch or the like that opens the circuit when an abnormality occurs in the solar cell string (see, for example, Patent Document 1).

  Moreover, as described in Patent Document 1, generally, a photovoltaic power generation system includes a backflow prevention diode in order to prevent an output current of a solar cell string from flowing to another solar cell string as a reverse current. ing. In general, a backflow prevention diode is provided in a junction box together with electric parts such as a switch.

  FIG. 6 shows a schematic configuration in a general junction box 101. As shown in FIG. 6, the connection box 101 accommodates electrical components and the like provided on an electric circuit for connecting the solar cell string 2 and the power conditioner 5. Specifically, the connection box 101 houses a switch 110, a fuse holder 120, a sensor module 130, and a diode module 140.

  The switch 110 is composed of a switch including an operation lever 111, and opens and closes an electric circuit according to an operation by an administrator. The fuse holder 120 includes fuses 121 and 122 that open the electric circuit when an excessive current flows in the electric circuit. The sensor module 130 includes a current measurement unit 131 that measures the output current of the solar cell string 2 and a voltage measurement unit 132 that measures the output voltage of the solar cell string 2. The diode module 140 includes a backflow prevention diode 141. In the connection box 101, the switch 110 and the fuse holder 120, the fuse holder 120 and the sensor module 130, and the sensor module 130 and the diode module 140 are electrically connected using the wiring W.

Japanese Patent Laid-Open No. 2015-231249

  However, in the configuration in which the reverse current is prevented by the reverse current prevention diode 141, there is a problem that energy loss occurs in the diode 141. Further, there is a problem that a space for installing a backflow prevention diode 141 and a heat radiating plate for dissipating heat generated in the diode 141 is increased, and it is complicated to connect electrical components such as the diode module 140 by the wiring W. There was a problem that there was.

  This invention is made | formed in view of the said situation, The subject is reducing the energy loss resulting from a reverse current, and the circuit breaker which can aim at space saving and wiring saving, and a solar power generation monitoring system It is to provide.

  In order to solve the above-mentioned problem, a circuit breaker according to claim 1 includes a first connection terminal to which an electric wire is connected, a second connection terminal to which another electric wire is connected, and the first connection terminal. An electric circuit for electrically connecting the first and second connection terminals to flow a forward current from the second connection terminal to the second connection terminal, a switch for opening and closing the electric circuit, and the second circuit provided in the electric circuit A reverse current detection unit for detecting a reverse current flowing from the connection terminal to the first connection terminal, a communication unit for receiving an open circuit command signal for opening the electric circuit from the outside, and a control unit for controlling the switch. The control unit operates the switch to open the electric circuit when the reverse current is detected by the reverse current detection unit or when the communication unit receives the opening command signal. And

  The circuit breaker according to claim 2 is the circuit breaker according to claim 1, wherein the circuit is connected to the first connection terminal and fixed to the first fixed-side contact member; A second fixed-side contact member connected to and fixed to the two connection terminals, and a movable-side contact member movable relative to the first and second fixed-side contact members, the movable-side contact member Is moved to a closed position where the electric circuit is closed by contacting the first and second fixed contact members, and an open position where the electric circuit is opened apart from the first and second fixed contact members. The switch is characterized in that the electric circuit is opened by moving the movable contact member from the closed position to the open position.

  Further, the circuit breaker according to claim 3 is the circuit breaker according to claim 2, wherein the switch supports the movable contact member and is provided with a movable member that is capable of linear reciprocating motion; An elastic member that moves the movable member, a movement restricting member that restricts movement of the movable member, and a solenoid actuator that retracts the movement restricting member to a position that does not hinder linear reciprocation of the movable member. And

  According to a fourth aspect of the present invention, there is provided the electric circuit breaker according to the third aspect, wherein the movable member includes the first and the first members when the movable contact member is located at the open position. An arc extinguishing magnet for applying a magnetic field is provided between the two fixed contact members and the movable contact member.

  In addition, a photovoltaic power generation monitoring system according to a fifth aspect includes a plurality of solar cell strings that receive light to generate electric energy, the electric circuit breaker according to any one of claims 1 to 4, and the electric A power conditioner that converts energy into predetermined power, and each of the plurality of solar cell strings is connected in series with the circuit breaker in a one-to-one relationship, and the plurality of circuit breakers Are connected in parallel to each other, the first connection terminal included in the circuit breaker is connected to the solar cell string, and the second connection terminal included in the circuit breaker is connected to the power conditioner. It is characterized by having.

  According to the present invention, it is possible to provide an electric circuit breaker and a photovoltaic power generation monitoring system capable of reducing energy loss due to reverse current and saving space and wiring.

It is a block diagram which shows schematic structure of the solar power generation monitoring system which concerns on one Embodiment of this invention. It is a block diagram which shows schematic structure of the electric circuit interruption apparatus which concerns on the same embodiment. It is a top view of the electric circuit interruption device concerning the embodiment. It is sectional drawing of the electric circuit interruption apparatus which concerns on the same embodiment, Comprising: It is a figure which shows the state with which the electric circuit is closed. It is sectional drawing of the electric circuit interruption apparatus which concerns on the same embodiment, Comprising: It is a figure which shows the state with an open electric circuit. It is a block diagram which shows schematic structure in the conventional connection box.

An embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the photovoltaic power generation monitoring system 1 includes a plurality of solar cell strings 2, a connection box 3, a circuit breaker 4 provided in the connection box 3, a power conditioner 5, and an external controller 6. And a monitoring device 7.

  Each of the solar cell strings 2 (hereinafter referred to as “string 2”) is composed of a plurality of solar cell modules (not shown) connected in series. The string 2 receives light and generates electrical energy. Each of the plurality of strings 2 is connected in series with a circuit breaker 4 in a one-to-one relationship. When the string 2 generates power, a direct current is supplied from the string 2 to the circuit breaker 4.

  A plurality of connection boxes 3 are provided according to the solar cell array composed of one or more strings 2. Each of the connection boxes 3 accommodates an electric circuit breaker 4, collects the DC power supplied from the plurality of strings 2, and outputs it to the power conditioner 5.

  The electric circuit breaker 4 is constituted by a terminal block with an opening / closing function. The plurality of circuit breakers 4 in the connection box 3 are connected in parallel to each other. The electric circuit breaker 4 opens and closes an electric circuit for connecting the string 2 and the power conditioner 5. The circuit breaker 4 measures the power generation status of the string 2 and transmits information related to the power generation status to the external controller 6.

  The power conditioner 5 (hereinafter referred to as “power conditioner 5”) converts the electric energy generated by the string 2 into predetermined power. Specifically, the power conditioner 5 converts the direct current input from the plurality of connection boxes 3 into an alternating current as an output of the mega solar.

  The external controller 6 includes a communication device that communicates with the circuit breaker 4 and the monitoring device 7. The external controller 6 controls the circuit breaker 4 by transmitting a command signal based on a command input by an administrator (not shown) using the monitoring device 7. The external controller 6 receives information related to the power generation status of the string 2 from the circuit breaker 4 and transmits the information to the monitoring device 7.

  The monitoring device 7 is composed of a stationary or portable information terminal device used by an administrator. The monitoring device 7 includes an input device (not shown) for an administrator to input a command, a display device for displaying information related to the power generation status of the string 2 to the administrator, and the like. The administrator can determine whether or not the electric circuit breaker 4 needs to open the electric circuit with reference to the power generation status of the displayed string 2, and can input a command to open the electric circuit to the monitoring device 7.

With reference to FIG. 2, the electrical configuration of the circuit breaker 4 will be described.
As shown in FIG. 2, the circuit breaker 4 includes first connection terminals 11A and 11B connected to the string 2, second connection terminals 12A and 12B connected to the power conditioner 5, and electric circuits 13A, 13B.

  An electric wire connected to a plus terminal (not shown) of the string 2 is connected to the first connection terminal 11A, and an electric wire connected to a minus terminal (not shown) of the string 2 is connected to the first connection terminal 11B. . Hereinafter, the pair of first connection terminals 11 </ b> A and 11 </ b> B are collectively referred to as “first connection terminal 11”.

  An electric wire connected to a plus terminal (not shown) of the power conditioner 5 is connected to the second connection terminal 12A, and an electric wire connected to a minus terminal (not shown) of the power conditioner 5 is connected to the second connection terminal 12B. . Hereinafter, the pair of second connection terminals 12A and 12B are collectively referred to as “second connection terminals 12”.

  The electric paths 13 </ b> A and 13 </ b> B are electric circuits between the first connection terminal 11 and the second connection terminal 12. The electric circuit 13A electrically connects the first and second connection terminals 11A and 12A in order to pass a DC forward current from the first connection terminal 11A to the second connection terminal 12A. Further, the electric circuit 13B electrically connects the first and second connection terminals 11B and 12B. Hereinafter, the pair of electric circuits 13A and 13B are collectively referred to as “electric circuit 13”. The electric circuit 13 includes a first fixed side contact member 14 that is electrically connected and fixed to the first connection terminal 11, and a second fixed side contact that is electrically connected and fixed to the second connection terminal 12. A member 15 and a movable contact member 16 movable with respect to the fixed contact members 14 and 15 are provided. The electric circuit 13 has two contact members 14, 15, and 16 corresponding to the electric circuits 13A and 13B.

  Furthermore, the circuit breaker 4 includes a switch 21 that opens and closes the circuit 13, a current measuring unit 22 and a voltage measuring unit 23 that measure the output current and output voltage of the string 2, and a communication unit 24 that communicates with the external controller 6. The control unit 25 and fuses 26A and 26B provided in the electric circuit 13 are provided.

  The switch 21 closes the electric circuit 13 by bringing the movable contact member 16 into contact with the first fixed contact member 14 and the second fixed contact member 15, and the first fixed contact member 14 and the first fixed contact member 14. The electric circuit 13 is opened by separating the movable contact member 16 from the second fixed contact member 15.

  The current measuring unit 22 is configured by a hall CT (current transformer) or a flux gate CT provided in the electric circuit 13A. The current measuring unit 22 measures the output current of the string 2 by detecting the magnitude of the current flowing through the electric path 13A. Further, the current measurement unit 22 functions as a reverse current detection unit that detects the reverse current of the DC flowing from the second connection terminal 12A to the first connection terminal 11A by detecting the direction of the current flowing through the electric circuit 13A. .

  The voltage measuring unit 23 is configured by a DCVT (Direct Current Voltage Transformer) provided between the electric circuits 13A and 13B. The voltage measurement unit 23 measures the output voltage of the string 2 by detecting a potential difference between the electric circuits 13A and 13B.

  The communication unit 24 includes a communication module that performs wired communication or wireless communication. The communication unit 24 receives from the external controller 6 a command signal corresponding to the command of the administrator input to the monitoring device 7. When a command to open an electric circuit connecting the string 2 and the power conditioner 5 is input to the monitoring device 7, the communication unit 24 receives an open circuit command signal to open the electric circuit 13. The communication unit 24 transmits information related to the power generation status of the string 2 to the external controller 6.

  The control unit 25 is configured by a control circuit that operates based on a program incorporated in advance and a command signal from the outside. Specifically, the control unit 25 controls the switch 21 so that the electric circuit 13 is opened when a reverse current is detected by the current measurement unit 22 or when an opening command signal is received by the communication unit 24. That is, the control unit 25 operates the switch 21 so as to transition from the closed state to the open state when the current measuring unit 22 detects a reverse current and when the communication unit 24 receives an open circuit command signal. Therefore, the control unit 25 does not operate the switch 21 in the closed state when the current measurement unit 22 detects a forward current and when the communication unit 24 does not receive an open circuit command signal. Note that when an excessive current flows through the electric circuit 13, the fuses 26 </ b> A and 26 </ b> B open the electric circuit 13, so that the control unit 25 does not operate the switch 21 even when the current measuring unit 22 detects a reverse current. In addition, the control unit 25 causes the communication unit 24 to transmit the measurement results obtained by the current measurement unit 22 and the voltage measurement unit 23 as information relating to the power generation status of the string 2.

  The fuse 26A is provided in the electric circuit 13A, and opens the electric circuit 13A when an excessive current flows through the electric circuit 13A. The fuse 26B is provided in the electric circuit 13B, and opens the electric circuit 13B when an excessive current flows through the electric circuit 13B. The fuses 26A and 26B interrupt an excessive current that cannot be interrupted by the switch 21 in the event of a short circuit failure or the like. Hereinafter, the pair of fuses 26A and 26B is collectively referred to as “fuse 26”.

  The mechanical configuration of the circuit breaker 4 will be described with reference to FIGS. In addition, the front-back direction X, the left-right direction Y, and the up-down direction Z which are shown with the arrow in a figure are directions orthogonal to each other. Further, the vertical direction Z is not limited to a vertical direction.

  4 and 5 show a cross section of the casing 31 taken along the line AA in FIG. 4 and 5, only the electric parts provided in the electric circuit 13B (see FIG. 2) and the mechanical parts that open and close the electric circuit 13B are illustrated, and the electric parts provided in the electric circuit 13A (see FIG. 2) are illustrated. Illustration of mechanical parts that open and close 13A is omitted.

  As shown in FIG. 3, the circuit breaker 4 includes a casing 31 that is mounted on the rail R and a pair of fuse holders 32 that can be attached to and detached from the casing 31. A plurality of the circuit breakers 4 can be arranged side by side on the same rail R extending in the left-right direction Y.

  The casing 31 is formed of a resin material having electrical insulation, and houses the components of the electric circuit 13 and the components of the switch 21. 3-5, illustration of a part of the electric circuit 13, the current measurement unit 22, the voltage measurement unit 23, the communication unit 24, the control unit 25, and the like is omitted. The first connection terminal 11 is provided at the front end portion in the casing 31, and the second connection terminal 12 is provided at the rear end portion in the casing 31.

As shown in FIGS. 4 and 5, an arc extinguishing chamber 31 </ b> A, an electronic component housing chamber 31 </ b> B, and the like are provided in the casing 31.
The arc extinguishing chamber 31A forms a space for extinguishing arc discharge. Inside the arc extinguishing chamber 31 </ b> A, a first fixed contact member 14, a second fixed contact member 15, and a movable contact member 16 are provided.

  The electronic component storage chamber 31B forms a space for storing electronic components. A current measurement unit 22, a voltage measurement unit 23, a communication unit 24, and a control unit 25 are provided inside the electronic component storage chamber 31B.

  The fuse holder 32 is formed of a resin material having electrical insulation, and holds the fuse 26. The fuse 26 can be easily replaced by removing the fuse holder 32 from the casing 31, and the fuse 26 can be easily provided in the electric circuit 13 by attaching the fuse holder 32 to the casing 31.

  The switch 21 includes a movable member 41 that supports the movable contact member 16 and is capable of linear reciprocation, an elastic member 42 that moves the movable member 41, and a movement restricting member that restricts movement of the movable member 41. 43 and a solenoid actuator 44 that retracts the movement restricting member 43 at a position that does not hinder the linear reciprocating motion of the movable member 41.

  The movable member 41 is configured by a bar-shaped slider extending in the up-down direction Z. The movable member 41 has a position (see FIG. 4) that closes the electric circuit 13 by bringing the stationary contact members 14 and 15 into contact with the movable contact member 16 by linear reciprocation along the vertical direction Z, and the stationary contact member. 14, 15 and the movable contact member 16 are moved apart to move to a position (see FIG. 5) where the electric circuit 13 is opened. The movable member 41 has a recess 41 </ b> A in which the movement restricting member 43 can be hooked.

  The elastic member 42 is configured by a coil spring provided below the movable member 41. The elastic member 42 is compressed when the movable member 41 moves downward. That is, the elastic member 42 is elastically deformed by moving the movable member 41 to the closed position, and urges the movable member 41 to move to the open position.

  The movement restricting member 43 is configured by a stopper that is caught in the recess 41 </ b> A that is a part of the movable member 41. The movement restricting member 43 is provided so as to be movable in the front-rear direction X, which is a direction perpendicular to the direction in which the movable member 41 reciprocates linearly. The movement restricting member 43 restricts the movement of the movable member 41 located at the closed position by being caught in the recess 41 </ b> A of the movable member 41. Further, the movement restricting member 43 moves backward to escape from the recess 41 </ b> A and retreats to a position that does not hinder the linear reciprocating motion of the movable member 41. Thus, the movement restriction of the movable member 41 in the vertical direction Z is released.

  The solenoid actuator 44 is configured by a linear actuator including a magnetic shaft 44A that can move in the front-rear direction X. The solenoid actuator 44 is controlled by the control unit 25. When the control unit 25 causes the switch 21 to transition from the closed state to the open state, the solenoid actuator 44 operates to move the magnetic shaft 44A backward. The magnetic body shaft 44A is connected to the movement restricting member 43, and the movement restricting member 43 also moves rearward when the magnetic body shaft 44A moves rearward.

  The movable member 41, the elastic member 42, and the movement restricting member 43 are provided in the casing 31 in two according to the pair of electric paths 13A and 13B, but only one solenoid actuator 44 is provided in the casing 31. It has been. That is, by operating one solenoid actuator 44, the two movable members 41 for opening and closing the electric paths 13A and 13B move to the closed position.

  Further, the switch 21 releases the restriction of movement of the movable member 41 when the elastic member 45 for pressing the movable contact member 16 against the fixed contact members 14 and 15 and the solenoid actuator 44 are not operating. Are provided with an elastic member 46, an opening operation lever 47, a closing operation lever 48, and an arc extinguishing magnet 49.

  The elastic member 45 is configured by a coil spring provided above the movable contact member 16. The elastic member 45 is compressed by moving the movable member 41 downward, and causes the movable contact member 16 to be in close contact with the fixed contact members 14 and 15 when the movable member 41 is located at the closed position.

  The elastic member 46 is configured by a compression coil spring that is compressed in the front-rear direction X. The elastic member 46 presses the movement restricting member 43 forward. In this manner, the movement restricting member 43 is configured not to move backward when the solenoid actuator 44 is not operating and when a predetermined force or more is not applied to the opening operation lever 47.

  The opening operation lever 47 is an operation member for moving the movement restricting member 43 rearward without operating the solenoid actuator 44. The opening operation lever 47 is configured to be movable in the vertical direction Z and to be rotatable about a predetermined rotation axis R1. As indicated by a two-dot chain line in FIG. 4, the upper end portion of the opening operation lever 47 is lifted upward and tilted forward, whereby the movement restricting member 43 is moved backward in conjunction with the lower end portion of the opening operation lever 47. Move to.

  The closing operation lever 48 is an operation member for pushing the movable member 41 downward. The closing lever 48 is connected to the upper end of the movable member 41 and is configured to be rotatable about a predetermined rotation axis R2. The closing operation lever 48 protrudes upward from the casing 31, and it can be confirmed whether or not the electric circuit 13 is closed based on the protruding state of the closing operation lever 48. When the movable member 41 is in the open position, as shown by the two-dot chain line in FIG. 5, the closing operation lever 48 is tilted rearward so that the amount of protrusion of the closing operation lever 48 from the casing 31 is increased. Can be small.

  The arc extinguishing magnet 49 is a permanent magnet provided on the movable member 41. The arc-extinguishing magnet 49 moves in the vertical direction Z together with the movable member 41, and when the movable contact member 16 is located at the open position, the stationary contact members 14 and 15 and the movable side in the arc extinguishing chamber 31A. A magnetic field is applied between the contact member 16 and the contact member 16.

  Two elastic members 45, 46, an opening operation lever 47, a closing operation lever 48, and an arc extinguishing magnet 49 are provided in the casing 31 in accordance with the pair of electric paths 13A, 13B. The pair of opening operation levers 47 are connected by pins 47A (see FIG. 3) so as to be interlocked. The pair of closing operation levers 48 are also connected by pins 48A (see FIG. 3) so as to be interlocked.

  The stationary contact members 14 and 15 are conductive members fixed in the casing 31. The first fixed-side contact member 14 and the second fixed-side contact member 15 are provided with an interval in the front-rear direction X, and projecting shapes that come into contact with the movable-side contact member 16 are provided at their ends. Electrodes 14A and 15A are provided. In the present embodiment, the first fixed-side contact member 14 is the same component as the conductive member constituting the first connection terminal 11, and the second fixed-side contact member 15 is connected to the fuse 26. It is a conductive member.

  The movable contact member 16 is a conductive member that moves in the vertical direction Z within the casing 31. The movable contact member 16 is interlocked with the movable member 41 and contacts the fixed contact members 14 and 15 to close the electric circuit 13 (see FIG. 4), and is separated from the fixed contact members 14 and 15. It moves to the open position (refer FIG. 5) where the electric circuit 13 opens. The movable contact member 16 extends in the front-rear direction X so as to be bridged between the electrodes 14A, 15A of the fixed contact members 14, 15, and is fixed to both ends of the movable contact member 16 in the left-right direction X. Protruding electrodes 16A and 16B that are in contact with the electrodes 14A and 15A of the side contact members 14 and 15 are provided.

According to the present embodiment, the following effects can be obtained.
(1) The electric circuit breaker 4 opens the electric circuit 13A, and a current measurement unit 22 (reverse current detection unit) that is provided in the electric circuit 13A and detects a reverse current flowing from the second connection terminal 12A to the first connection terminal 11A. A communication unit 24 that receives an open circuit command signal from the outside and a control unit 25 that controls the switch 21 are provided. When the reverse current is detected by the current measurement unit 22, or the communication unit 24 opens the circuit. When the command signal is received, the switch 21 is operated so that the electric circuit 13 is opened. According to this configuration, it is possible to prevent a reverse current from being generated by opening the electric circuit 13 without using the backflow prevention diode 141 (see FIG. 6). For this reason, the energy loss resulting from a reverse current can be reduced compared with the structure which prevents the reverse current using the conventional backflow prevention diode 141.

  Further, compared to the configuration in which the reverse current prevention diode 141 is used to prevent the reverse current, a space for installing the reverse current prevention diode 141 and a heat radiating plate for radiating the heat generated in the diode 141 becomes unnecessary. Space saving in the connection box 3 can be achieved. Further, the backflow prevention diode 141 is not necessary, and the switch 21, the current measurement unit 22, the communication unit 24, and the control unit 25 are provided in the electric circuit breaker 4 as a unit, so that in the connection box 3 Reduced wiring can be achieved. Further, since it is not necessary to provide a breaker in the junction box 3, space saving in the junction box 3 and cost reduction can be achieved.

  In addition, when the reverse current is detected by the current measuring unit 22 or when the communication unit 24 receives an opening command signal, the switch 21 operates so that the electric circuit 13 is opened. Does not need to go to the place where the connection box 3 is installed, and the electric circuit 13 can be quickly opened.

  (2) The switch 21 regulates the movement of the movable member 41, the movable member 41 that supports the movable contact member 16 and is provided so that linear reciprocation is possible, the elastic member 42 that moves the movable member 41, and the movable member 41. A movement restricting member 43 and a solenoid actuator 44 that retracts the movement restricting member 43 to a position that does not hinder the linear reciprocation of the movable member 41 are provided. According to this configuration, the solenoid actuator 44 with a fast response speed retracts the movement restricting member 43, and the movable member 41 momentarily moves due to the restoring force of the elastic member 42. Therefore, the electric circuit 13 can be opened quickly, Generation of a discharge arc between the stationary contact members 14 and 15 and the movable contact member 16 can be effectively prevented.

  (3) The movable member 41 has an arc-extinguishing magnet 49 that applies a magnetic field between the stationary contact members 14 and 15 and the movable contact member 16 when the movable contact member 16 is in the open position. Is provided. According to this structure, generation | occurrence | production of a discharge arc can be prevented more effectively.

  (4) Since the circuit breaker 4 further includes the fuse 26 provided in the circuit 13, it is possible to prevent a large reverse current from occurring even if the switch 21 is not operated.

  (5) Each of the plurality of strings 2 is connected in series with the circuit breaker 4 in a one-to-one relationship, and the plurality of circuit breakers 4 are connected in parallel to each other, and the first connection terminal 11 Is connected to the string 2, and the second connection terminal 12 is connected to the power conditioner 5. According to this configuration, it is possible to prevent the output current of the string 2 from flowing into the other strings 2 as a reverse current by opening the electric circuit 13.

  The present invention is not limited to the above embodiment, and the above configuration can be changed. For example, the following modifications can be implemented, and the following modifications can be combined.

  -You may change the internal structure of the circuit breaker 4 suitably. Specifically, for example, even when the current measuring unit 22 detects the direction of the current flowing through the electric circuit 13B, the reverse current of the direct current flowing from the second connection terminal 12A to the first connection terminal 11A is detected. Good. In this case, the reverse current flowing from the second connection terminal 12A to the first connection terminal 11A is detected by detecting the current flowing from the first connection terminal 11B to the second connection terminal 12B. Further, the voltage measuring unit 23 may be omitted from the circuit breaker 4.

  As long as the movable member 41 and the movable contact point member 16 can be moved quickly, an elastic member other than the coil spring may be employed. Further, an actuator other than the solenoid actuator may be employed as long as the movement restricting member 43 can be retracted. The actuator for opening and closing the electric circuit 13A and the actuator for opening and closing the electric circuit 13A may not be shared.

  The arrangement of the arc extinguishing magnet 49 may be changed. For example, the arc extinguishing magnet 49 may be fixed in the arc extinguishing chamber 31A. Further, the arc extinguishing magnet 49 may be an electromagnet. Further, the arc extinguishing magnet 49 may be omitted.

DESCRIPTION OF SYMBOLS 1 Photovoltaic power generation monitoring system 2 Solar cell string 3 Connection box 4 Electric circuit breaker 5 Power conditioner 11, 11A, 11B 1st connection terminal 12, 12A, 12B 2nd connection terminal 13, 13A, 13B Electric circuit 14 1st Fixed side contact member 15 Second fixed side contact member 16 Movable side contact member 21 Switch 22 Current measurement unit (reverse current detection unit)
23 Voltage measurement unit 24 Communication unit 25 Control unit 26, 26A, 26B Fuse 41 Movable member 42 Elastic member 43 Movement restricting member 44 Solenoid actuators 45, 46 Elastic member 47 Opening operation lever 48 Closing operation lever 49 Arc extinguishing magnet

Claims (5)

A first connection terminal to which an electric wire is connected;
A second connection terminal to which another electric wire is connected;
An electrical circuit that electrically connects the first and second connection terminals to allow forward current to flow from the first connection terminal to the second connection terminal;
A switch for opening and closing the electric circuit;
A reverse current detection unit that is provided in the electric circuit and detects a reverse current flowing from the second connection terminal to the first connection terminal;
A communication unit for receiving an open command signal for opening the electric circuit from the outside;
A control unit for controlling the switch,
The control unit operates the switch so that the electric circuit is opened when the reverse current is detected by the reverse current detection unit or when the communication unit receives the opening command signal. The circuit breaker to do. The electrical circuit includes a first fixed contact member connected and fixed to the first connection terminal, a second fixed contact member connected and fixed to the second connection terminal, the first and A movable contact member movable with respect to the second fixed contact member,
The movable contact member is in a closed position where the electric circuit is closed by contacting the first and second fixed contact members, and an open circuit where the electric circuit is opened apart from the first and second fixed contact members. Go to position and
The electric circuit breaker according to claim 1, wherein the switch opens the electric circuit by moving the movable contact member from the closed position to the open position. The switch includes a movable member that supports the movable contact member and is capable of linear reciprocation, an elastic member that moves the movable member, a movement restricting member that restricts movement of the movable member, The electric circuit breaker according to claim 2, further comprising: a solenoid actuator that retracts the movement restriction member at a position that does not hinder linear reciprocation of the movable member. The movable member is for arc extinguishing that applies a magnetic field between the first and second fixed contact members and the movable contact member when the movable contact member is located at the open position. The circuit breaker according to claim 3, wherein a magnet is provided. A plurality of solar cell strings that generate electrical energy in response to light; and
The circuit breaker according to any one of claims 1 to 4,
A power conditioner that converts the electrical energy into predetermined power, and
In each of the plurality of solar cell strings, the circuit breaker is connected in series in a one-to-one relationship, and the plurality of circuit breakers are connected in parallel to each other,
The first connection terminal included in the circuit breaker is connected to the solar cell string, and the second connection terminal included in the circuit breaker is connected to the power conditioner. Power generation monitoring system.

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