KR102293197B1 - Photovoltaic equipment - Google Patents

Abstract

The present invention relates to a photovoltaic system using a multi-input diode using a direct current (DC) high-voltage extinction device (device installed in the switchgear of an electric circuit to quickly extinguish arc discharge that occurs during opening or closing thereof). A plurality of DC circuits are configured so that power flowing through the plurality of DC circuits is collected into one circuit and output to the system. A relay for turning on/off the plurality of DC circuits is connected to each of the DC circuits, and multi-input circuits for inputting a multi-signal to a relay connected to any one of the plurality of circuits are connected. Multi-input switches are turned on/off according to a control signal transmitted by a control unit to the multi-input circuits. A diode for preventing an input short circuit is connected to an input unit of the multi-input circuits to which a current is input through the multiple input switch. Sides of second multi-input circuits are connected to each of a plurality of circuits excluding a circuit to which the multi-input circuits and the multi-input switch are connected. The other sides of the second multi-input circuits are combined into one to be connected to the multi-input circuits corresponding to the space between output units of the multi-input circuits and the diode, so that power is output to the multi-input circuits. The diode is connected to each of the plurality of second multi-input circuits to prevent an input short circuit. A measuring unit monitors the state of the value of power flowing through the circuits. A semiconductor-type multi-input circuit (Bypass) for removing high voltages and arcs or an expensive high-voltage multi-input switch capable of opening and closing high voltages is provided to only one circuit among the plurality of circuits, so that the switches can be protected by using the multi-input switches.

Description

Photovoltaic power generation device with multi-input diode applied with DC high voltage extinction device {PHOTOVOLTAIC EQUIPMENT}

The present invention relates to a photovoltaic device to which a multi-input diode applied to a DC high voltage extinguishing device (a device installed in a switchgear of an electric circuit to quickly turn off an arc discharge generated when opening and closing) is applied. The circuit is configured so that the flowing power is collected into one circuit and output to the grid,

A relay for turning on/off circuits is connected to each of the plurality of DC circuits, and a multiple input circuit for selecting a relay connected to any one of the plurality of circuits is connected, and the control signal of the controller is applied to the multiple input circuit. A switch to select multiple inputs to be turned on/off according to;

Connecting a diode for preventing an input short circuit to the input part of the multi-input circuit to which the current is input to the multi-input switch;

One side of the second multi-input circuit is respectively connected to the plurality of circuits except for the circuit connecting the multi-input circuit and the multi-input switch,

The other side of the second multiple input circuit is combined into one and connected so that power is output to the multiple input circuit corresponding between the output unit of the multiple input circuit and the diode;

Provided including a diode connected to each of the plurality of second multiple input circuits to prevent an input short circuit, and a measuring unit for monitoring the state of a flowing power value of the circuit

When provided in this way, a semiconductor-type multiple input circuit (Bypass) for removing high voltage and arcing from only one circuit of a plurality of circuits or an expensive high voltage multiple input switch capable of opening and closing high voltage is provided through the multiple input switch. Multiple switches can be protected.

For reference, a photovoltaic device is a solar cell panel that converts light energy into DC electrical energy, an inverter that converts DC power into AC power, connects the solar panel and the inverter, and converts the DC power produced by the solar panel to the inverter. It includes a connecting panel that transmits. The AC power converted by the inverter is boosted in a separate device and transmitted to the electrical system or supplied as a load for use.

The figure below (corresponding to Table 1) schematically shows the structure of a photovoltaic device, and since the amount of electrical energy generated from a unit solar cell is small, a panel (module) including a plurality of unit solar cells made in the form A solar cell group including one or more panels constitutes a solar cell string (S1, S2, S3, ..., Sn), and a plurality of solar cell strings constitute the solar cell array 200 to secure necessary power. At this time, each solar cell string constituting the solar cell array 200 is connected to the connection panel 100 to secure necessary power.

On the other hand, in the photovoltaic connection panel 100, input terminals, fuses, diodes, etc. respectively connected to the output terminals of a plurality (4, 8, 16, 32 or more) of the solar cell strings are arranged and connected in parallel to form a solar cell DC power from the array

are added and transmitted to the inverter through the output terminal. The channels (input terminals, fuses, diodes, etc.) to which the power supply cables from the solar cell string are connected have a high risk of overcurrent, overheating, short circuit, etc. due to the complicated arrangement of various electrical components and wiring. It is easy to spread into a large fire in

For reference, in general, each solar cell module is composed of a plurality of solar cells. For example, when a typical solar cell module consists of 24 solar cells, the positive (+) terminal and the negative (+) terminal ( -) Produces about 40V between terminals. In fact, a high voltage of 600 ~ 1000V and a current of tens to hundreds of amps (A) flows between the (+) power string and the ground (-) of the photovoltaic array in which a plurality of solar cell modules are connected in series and parallel.

In such a photovoltaic power generation system, a disconnector is installed between the string and the inverter to cut off the high-voltage string DC power to which the string of the photovoltaic array is connected for failure or maintenance.

In the conventional disconnector, a relay or a circuit breaker having a mechanical contact is usually used.

However, when switching a string (+) DC power with hundreds of volts DC voltage and several tens to hundreds of amps using the mechanical contact of the disconnector, DC power has no current zero point like AC power. Therefore, a direct current arc is easily generated between the contact points of the disconnector, and the arc generated once lasts for a considerable time until the contact gap is sufficiently separated. The continuous arc not only shortens the life of the disconnector by melting the contact point of the disconnector, but also poses a risk of a fire accident.

So, as an amount to solve the above problems, registration number 10-1777195 is

A plurality of solar panels (S1) separately connected to a plurality of groups of circuits, a plurality of input terminals, a plurality of fuses and circuit breakers, a plurality of diodes, and an output terminal for combining the power output from the plurality of diodes into one In the connection panel,

a plurality of bypass circuits for bypassing the power input from the plurality of fuses to the plurality of diodes and outputting them to an output terminal; a plurality of multiple switches for opening and closing the multiple circuits according to a control signal of a control unit, and a measuring unit for monitoring a state of a power value flowing through the circuit;

In a state in which the state of the circuit is determined by the measurement unit to open and close the multiple switches, and the power input to the fuse is simultaneously input to the diode and the multiple switches

During normal and equal power generation in each of the plurality of groups, any

When the measured value measured through the measuring unit in one group is out of the preset voltage range, the normally generated power is abnormally flowing.

It is determined that the reverse current flows in the circuit direction, and the multi-switch is turned off to cut the reverse current by the diode, and when the power value measured through the measuring unit during monitoring is within the preset voltage range, it is determined that it is normal power production, It is a configuration in which multiple switches are turned on so that power is output to the output terminal via multiple circuits.

As described above, by providing multiple circuits to a plurality of circuits, and then providing multiple switches to each of the multiple circuits, the product price increases, and by providing a plurality of multiple switches, the failure probability is high, and a plurality of multiple switches are provided. This increases the volume, increases storage and transportation costs, and has problems such as cumbersome manufacturing due to the need to connect a plurality of multiple switches.

(Patent Document 1) 1. Republic of Korea Patent Publication No. 10-2017-0113836

(Patent Document 2) 2. Republic of Korea Registration No. 10-1777195

In view of the above conventional problems, the configuration of the present invention configures a circuit such that power flowing through a plurality of DC circuits is collected into one circuit and output to the system,

A relay for turning on/off circuits is connected to each of the plurality of DC circuits, and a multiple input circuit for multiple input of a relay connected to any one of the plurality of circuits is connected to the multiple input circuit, and a control signal from the control unit is provided to the multiple input circuit. A multi-input switch that turns on/off according to

Connecting a diode for preventing an input short circuit to the input part of the multi-input circuit to which the current is input to the multi-input switch;

One side of the second multi-input circuit is respectively connected to the plurality of circuits except for the circuit connecting the multi-input circuit and the multi-input switch,

The other side of the second multiple input circuit is combined into one and connected so that power is output to the multiple input circuit corresponding between the output unit of the multiple input circuit and the diode;

Provided including a diode connected to each of the plurality of second multiple input circuits to prevent an input short circuit, and a measuring unit for monitoring the state of a flowing power value of the circuit

When provided in this way, a semiconductor-type multiple input circuit (Bypass) for removing high voltage and arcing from only one circuit of a plurality of circuits or an expensive high voltage multiple input switch capable of opening and closing high voltage is provided through the multiple input switch. Multiple switches can be protected.

A detailed configuration will be described with reference to the accompanying drawings.

In the photovoltaic device,

The electric power flowing through the plurality of DC circuits 10 is collected into one circuit and converted into a system.

Configure the circuit to output,

Multi-input relay 20a connected to any one circuit 10a of the plurality of circuits 10 by connecting a relay 20 for turning on/off circuits respectively to the plurality of DC circuits 10 A multi-input switch 40 for connecting the input circuit 30 and turning on/off the multi-input circuit 30 according to a control signal of the control unit 100;

Connecting the input short circuit prevention diode (a') to the input part (30a) of the multiple input circuit (30) to which the current is input to the multiple input switch (40);

One side 50a of the second multiple input circuit 50 is respectively connected to the plurality of circuits 10 except for the circuit 10a connecting the multiple input circuit 30 and the multiple input switch 40,

The other side 50b of the second multiple input circuit 50 is combined into a multiple input circuit 30 corresponding to between the output part 30a of the multiple input circuit 30 and the diode a'. It is connected to output power,

It consists of a diode (a) connected to each of the plurality of second multiple input circuits (50) to prevent an input short circuit, and a measuring unit (130) for monitoring the state of the flowing power value of the circuit.

Specifically, a plurality of second multiple relays 20 for turning on/off circuits are connected to each of the plurality of DC circuits 10 and bypassing the relays 20 respectively to the plurality of DC circuits 10 . One side 50a of the input circuit 50 is connected, and the other side 50b of the plurality of second multiple input circuits 50 is combined into one and connected to the multiple input switch 40 .

In a state in which the plurality of relays 20 and the multiple input switch 40 connected to the plurality of circuits 10 according to the control signal of the control unit 100 are maintained in an on' state

In the process of sequentially turning on/off a plurality of relays 20 for a set time through the control unit 100, the power passing through the multi-input switch 40 is measured through the detection unit 140,

When the measured value measured in one circuit is outside the preset voltage, current, leakage current, etc. range, it is determined that there is a problem in the circuit 10 out of the range such as voltage, current, leakage current, etc. 10) is to cut off the power by turning off the relay 20.

The relay corresponds to a latching relay, and the multi-input switch corresponds to a MOS-FET switch.

The latching relay has a dual coil and at least one three-way switching mechanical contact and a permanent magnet capable of maintaining the circuit even when the current of the control circuit is cut off, and the three-way switching mechanical contact is the dual It is characterized in that it is opened and closed by a set (SET) signal that excites any one of the coils and a relay signal of a reset (REST).

The multiple input circuit 30 corresponds to a bypass circuit,

The multi-input switch 40 corresponds to a bypass switch,

The second multiple input circuit 50 corresponds to the second bypass circuit 50 .

As described above, the present invention provides a single multi-input circuit to a plurality of circuits and then shares one multi-input circuit to the plurality of circuits, thereby reducing the product price and providing a single multi-input switch. It is a very beneficial invention that has a low probability, a small volume and low storage and transportation costs by providing one multi-input switch, and is convenient to manufacture by wiring only one multi-input switch.

In addition, according to the present invention, the arc generation between the mechanical contacts is fundamentally suppressed by operating the latching relay in a state where the DC power is inputted in parallel for a certain time and the voltage between the mechanical contacts of the latching relay is lowered to several volts. do. For this reason, even if the capacity of the latching relay is not increased, the lifespan of the latching relay is greatly extended, and a fire accident is prevented.

1 is an overall flowchart of an embodiment of a photovoltaic device to which a multi-input diode to which a DC high voltage extinction device of the present invention is applied is applied.
Figure 2 is a flowchart showing the operation state of the multi-input switch and relay of the present invention.
3 is an explanatory diagram showing a flowchart of the present invention;
4A) is a parallel multiple input protection circuit of a DC power disconnector according to an embodiment of the present invention.
B) is the operation time chart of a) of FIG. 4 .
5 is another overall flow chart of a photovoltaic device to which a multi-input diode is applied to which the DC high voltage extinction device of the present invention is applied.

Let's take a look at the configuration with reference to the accompanying drawings, and look at an embodiment according thereto.

In the photovoltaic power generation device to which a multi-input diode to which a DC high voltage extinction device is applied,

The electric power flowing through the plurality of DC circuits 10 is collected into one circuit and converted into a system.

Configure the circuit to output,

Multi-input relay 20a connected to any one circuit 10a of the plurality of circuits 10 by connecting a relay 20 for turning on/off circuits respectively to the plurality of DC circuits 10 A multi-input switch 40 for connecting the input circuit 30 and turning on/off the multi-input circuit 30 according to a control signal of the control unit 100;

Connecting the input short circuit prevention diode (a') to the input part (30a) of the multiple input circuit (30) to which the current is input to the multiple input switch (40);

One side 50a of the second multiple input circuit 50 is respectively connected to the plurality of circuits 10 except for the circuit 10a connecting the multiple input circuit 30 and the multiple input switch 40,

The other side 50b of the second multiple input circuit 50 is combined into a multiple input circuit 30 corresponding to between the output part 30a of the multiple input circuit 30 and the diode a'. It is connected to output power,

It consists of a diode (a) connected to each of the plurality of second multiple input circuits (50) to prevent an input short circuit, and a measuring unit (130) for monitoring the state of the flowing power value of the circuit.

Looking at the embodiment of the configuration as follows,

A diode a is connected to each of the plurality of second multiple input circuits 30 and 50 , and a diode a′ is connected to one circuit 10a among the plurality of circuits 10 . That is, a diode is connected to each circuit 10 .

In this case, the power flowing to the multiple input circuit and the second multiple input circuit is in a state in which reverse flow is prevented because each diode is connected.

There is a measuring unit 130 that monitors the state of each power value flowing through the plurality of circuits 10 , and the state of the circuit 10 is determined by the measuring unit 130 , and the multiple input switch is passed through the control unit 100 . (40) and the plurality of circuits (10) to open and close the relay (20)

In a state in which power is simultaneously input to the plurality of circuits 10 from a plurality of DC power input units,

When the measured value measured in any one circuit through the measuring unit 130 while normally outputting power from the plurality of circuits 10 is out of a preset voltage range, current range, or leakage current range,

Turn on the multiple input switch 40 connected to the multiple input circuit 30 to cut off the power flowing in the circuit 10 out of the voltage range or the current range or the leakage current range, and then turn on the voltage range or the current range or the leakage current range The power of the circuit 10 out of

In a state in which output is made to the output terminal through the multiple input circuit 30, the relay 20 connected to the circuit 10 out of the voltage range, current range, or leakage current range is turned off (after turning off the multiple input switch is turned off) ) and then turn off the multi-input switch 40 to cut off the power supply of the circuit out of the voltage range, current range, or leakage current range.

When a set time elapses after the power is cut off of the circuit 10 out of the voltage range, current range, or leakage current range, the multi-input switch 40 is turned on, and the power value measured through the measuring unit 130 is set to a preset voltage. When it is within the range or current range or leakage current range, it is determined that it is a normal power supply, and the off relay is turned on' so that power is output to the output terminal via the turned off relay, and then the control signal of the control unit 100 is applied. Accordingly, the multi-input switch 40 is turned off.

Next, it is possible to determine whether a failure occurs by monitoring a plurality of circuits 10 in the multiple input circuit.

In a state in which the plurality of relays 20 and the multiple input switch 40 connected to the plurality of circuits 10 according to the control signal of the control unit 100 are maintained in an on' state

In the process of sequentially turning on/off a plurality of relays 20 for a set time through the control unit 100, the power passing through the multi-input switch 40 is measured through the detection unit 140,

When the measured value measured in one circuit is out of the preset voltage range or current range or leakage current range, it is determined that there is a problem in the circuit 10 out of the voltage range or current range or leakage current range, and the circuit with the problem (10)

The relay 20 is turned off to cut off the power.

An example of the configuration is as follows (see FIG. 5).

The power output to the output circuit 30b of the multiple input switch 40 is measured through the detection unit 140 .

And when the plurality of relays 50 connected to the plurality of circuits 10 are turned off through the control unit 100 in a preset order and then turned on after a set time, they are turned off in the off process for a predetermined time.

The power of the circuit 10 is output to the output terminal through the multiple input circuit 30 .

By configuring in this way, a plurality of circuits 10 can be checked through one detection unit 140, so the manufacturing cost is low, and a problematic circuit 10 line can be easily and conveniently found, so that quick maintenance is possible.

In the description, when the plurality of relays and the multi-input switch 40 are in the on state, the power input from the input unit flows in the direction of the plurality of relays (corresponding to the switches in the drawing), respectively.

The multi-input switch is temporarily closed only when the plurality of relays 20 are operated, and after the relay operation is completed, the multi-input switch is cut off (off).

This is because, when the multi-input switch is turned off, the power input from the input unit flows only in the direction of the plurality of relays, and does not flow to the multi-input switch 40 .

(Power moves in the direction of the relay with less resistance as the diode and the resistance of the multi-input switch act)

In the present invention, the MOS-FET is a switching device for power circuits of various electronic devices because high-speed switching is possible and gate driving is relatively simple. The multi-input switch 40 of the present invention uses a MOS-FET device (refer to Registration No. 10-1209639 for a MOS-FET gate driving circuit and driving method).

The MOS-FET device is capable of high-speed switching of high-voltage, high-current, and has a simple driving method.

However, if the current continuously flows, heat is severe and the device is destroyed.

In the present invention, the MOS-FET device is used to conduct electricity only for a short time when the arc is generated, and in the section in which current continuously flows in which heat is generated, the advantage of removing heat by using the relay contact is used.

A semiconductor-type multi-input circuit (Bypass) to eliminate voltage and arcing or an expensive high-voltage MOS-FET capable of opening and closing high voltage is used for switching. By using a mechanical contact, the performance against heat suppression and overcurrent is improved, and the cost is reduced.

The relay 20 of the present invention is a latching relay, and the latching relay RL1 has a dual coil and at least one or more 3 switching mechanical contacts. It is preferable to connect the contacts in parallel to increase the contact capacity. and

The mechanical contact of 3-way switching can be reliably opened and closed by the set (SET) signal that excites any one of the double coils and the relay signal of the reset (REST).

In addition, by using the double coil latching relay (RL1) that can maintain the open/closed state without a constant driving power source, the latching relay does not open and close by itself even if there is a power outage or a power supply failure, so safety accidents such as fire are prevented. .

The latching relay RL1 (see FIG. 4) is preferably a dual coil and at least one or more 3-way switching mechanical contacts to increase the contact capacity by connecting the contacts in parallel, and the 3-way switching mechanical contacts are preferable. The contact point is any one of the double coils.

It can be reliably opened and closed by the excitation SET signal and the reset relay signal. In addition, by using a double coil latching relay (RL1) that can maintain an open/close state without a constant driving power source, the latching relay does not open and close by itself even if there is a power outage or a power supply failure, thereby preventing safety accidents such as fire.

In addition, the photocoupler OP1 is preferably a photocoupler OP1 having a photocell output function capable of operating the gate drive signal with DC power (H/V INPUT & H/V OUTPUT) without external driving power supply. Unlike a general photocoupler, the photovoltaic output photocoupler OP1 has a voltage that can turn on the semiconductor switching element Q1 on the insulated output side and

A current is generated by itself to drive the semiconductor switching element Q1 without an external driving power source. Therefore, it is possible to control the semiconductor switching element Q1 even if there is a power failure or a power supply failure, and accordingly, the DC power disconnector 100 to which the parallel multiple input protection circuit of the semiconductor switching element Q1 is added is reliable. can work high.

5 is an operation time chart of each component of the DC power disconnector 100, and FIG. 3 (a) is an operation time of the semiconductor switching element Q1 operated by the element control signal B/P1 of the control device. Time chart, Fig. 3b is an operation time time chart of the mechanical contact of the latching relay RL1 while the semiconductor switching element Q1 operates for a predetermined time, Fig. 3c is the semiconductor switching element Q1 operates, At this time, when the latching relay RL1 operates, the DC voltage applied to the mechanical contact part of the latching relay RL1 is schematically shown.

The technology related to the latching relay and the like is described in detail in Publication No. 10-2017-0113836.

Control is, as shown, the power transmitter 11 subgroups (SG1) to (SGn) of at least two or more series-connected power transmitters 11, and the power transmitter 11 subgroup Power measuring means 13 and power measurement values (P1) to (Pn) for measuring power by measuring the voltage and current of (SG1) to (SGn), and each of the power transmitting units (including the power generating unit) subgroups (SG1) to (SGn) installed in the vicinity of the solar radiation measurement sensor 14 and the measured amount of information (L1) to (Ln), and each of the power transmitter subgroups (SG1) to (SGn) at a set time interval between each other Comparing the measured power values (P1 to Pn), if it is in an unbalanced state, it is judged as abnormal,

In addition, the amount of power (Pc) obtained by correcting the area of the small group (SG1) of the power transmitter 11 to the measured power value (P1) of the small group (SG1) and the information value (L1) measured at the location (Pc) A control unit 20 for determining and processing the operating state and deterioration of the power transmission unit small group (SG1) to (SGn) compared to

Communication in which the control unit 20 transmits an alarm message and data of the operation state and deterioration state of each of the power transmitting units 11 small groups SG1 to SGn to the remote communication unit 40 through the wireless communication module 30 It is characterized in that it includes means.

The power transmission unit small group SG1 includes a plurality of input units 11 and circuit 12 connected in series to obtain a predetermined voltage,

Power having a standard resistor (not shown) connected to any one line of the circuit 12 to measure the voltage from the circuit 12 and measure the current, and a voltage measuring line proportional to the current from the standard resistor It is characterized in that it includes a small group of transmission units (SG1).

The power transmitting units 11 may be input to the circuit as different values of voltage, current, leakage current, etc. input from the power transmitting unit 11 .

The power measuring means 13 of the power transmitting unit small group SG1 periodically measures the voltage from the voltage and current measurement lines drawn from the circuit 12 of the power transmitting unit small group SG1 and A/D conversion,

A unique identification number is assigned, and the digitally converted current and voltage values and the unique identification number are transmitted to the control unit 20 according to a predetermined cycle, and converted into a power value by the calculation formula of the program inputted in the arithmetic unit and stored. means (13).

In addition, the control unit (microprocessor), the digital value corresponding to the A / D converted current and voltage from the power measuring means 13, a unique identification number, an interface (not shown) for receiving the amount of insolation from the insolation meter;

The digital voltage/current measurement value and the solar radiation measurement value of the unique identification number received from the interface are stored in a memory device, and a constant according to the characteristics and size of each power transmission unit subgroups (SG1) to (SGn) is applied. Calculation is performed by correcting .

A key input unit for inputting the environment, the number of installations, calculation programs, etc. of the power transmission unit 11 of the small groups of power transmission units (SG1) to (SGn), an LCD monitor for displaying key input values and calculation processing results, and a program and a control unit 20 having a storage device for storing data.

Communication means, when the operation processing result of the control unit 20 is determined to be abnormal, the wireless module 30 for transmitting to the mobile communication terminal 40 of the administrator or user using WAP;

Through the wireless module 30 and the existing mobile communication network, the unique number of the power transmission unit small group 10 to the remote manager or user's mobile communication terminal 40 through the existing mobile communication network and the alarm text determined in response to the abnormal state and stored in the storage device By transmitting the measurement data to a remote manager or user, it is possible to know from a remote location which power transmitter subgroup 10 is in an abnormal state.

Briefly describing the active operation of such a remote monitoring system, the remote monitoring

When a desired administrator or user drives an application program installed in the mobile communication terminal to access the control unit 20 and transmits a status check request to the control unit 20, the control unit 20 receives a status check request from the manager or user It transmits the present or past results extracted by the user to the mobile communication terminal of the administrator or user.

In this embodiment, remote monitoring is performed without additional equipment by using WAP (Wireless Application Protocol) that is installed in the control unit 20 and the manager or user's mobile communication terminal and enables wireless data communication between the two devices. can do.

WAP acts as a communication emulator, and according to a predetermined protocol, it converts the received and demodulated signal from the other party into meaningful information. allows you to monitor

10 circuit 20 relay
30: multiple input circuit 30a: output unit
40: multiple input switch 50: second multiple input circuit
100: control unit 130: measurement unit
140: detection unit a': diode

Claims (3)

In the photovoltaic power generation device to which a multi-input diode to which a DC high voltage extinction device is applied,
A plurality of second multiple input circuits (50) for connecting relays (20) for turning on/off circuits respectively to a plurality of DC circuits (10) and bypassing the relays (20) to the plurality of DC circuits (10), respectively Connect one side (50a) of

The other side 50b of the plurality of second multiple input circuits 50 is combined into one.
It is connected to the multi-input switch 40,

A diode (a) connected to each of the plurality of second multiple input circuits (50) to block power reverse flow, and a measuring unit (130) for monitoring the state of the flowing power value of the circuit (10)
The state of the circuit 10 is determined by the measurement unit 130 and the relay 20 connected to the multiple input switch 40 and the plurality of circuits 10 is opened and closed through the control unit 100,

In a state in which the plurality of relays 20 and the multi-input switch 40 connected to the plurality of circuits 10 according to the control signal of the control unit 100 are kept in the on' state

In the process of sequentially turning on/off a plurality of relays 20 for a set time through the control unit 100, the power passing through the multi-input switch 40 is measured through the detection unit 140,

When the measured value measured in one circuit is out of the preset voltage range or current range or leakage current range, it is determined that there is a problem in the circuit 10 out of the voltage range or current range or leakage current range, and the circuit with the problem (10)
A photovoltaic device using a multi-input diode to which a DC high voltage extinction device is applied, characterized in that it includes a configuration that cuts off the power by turning off the relay (20).



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