A photovoltaic power generation DC arc protection system

Abstract

The present invention relates to the field of arc protection technology, and discloses a photovoltaic power generation DC arc protection system, which uses a power-off device, including: a cabinet, the bottom and top of which are respectively installed with a first connector and a second connector; and also includes: an adjustment chamber, which is embedded in the middle of the lower terminal, an electric push rod assembly is installed on the adjustment chamber, and the adjustment chamber is also provided with a first liquid chamber and a second liquid chamber that are mutually interpenetrating, and a push rod member is movably installed in the first liquid chamber; an electromagnetic driving component, which is arranged in the second liquid chamber, and uses the current increase principle of the arc effect to drive the energized connector to move and cut off the power. The photovoltaic power generation DC arc protection system uses the current change in the arc phenomenon process to enable the circuit breaker component of the system to quickly self-start, so that the system can quickly disconnect the circuit, realize arc protection, and improve the safety of circuit use.

Description

Technical Field

[0001] The invention relates to the technical field of arc protection, in particular to a photovoltaic power generation DC arc protection system. Background Art

[0002] In the process of collecting and utilizing photovoltaic power generation, it is necessary to converge the photovoltaic panels that are independently or combined, and use the converging components to centrally store the electricity generated by photovoltaic power generation. However, in the process of transmitting and storing electricity, arcing phenomenon may easily occur in the circuit due to external environmental factors or circuit aging and overvoltage. The arcing phenomenon is a circuit failure, which will cause arcing and high temperature at the power transfer position of the circuit, affecting the safety of circuit use. Therefore, it is necessary to set up an arc protection system and use circuit components such as arc sensors to achieve circuit breaking and current protection.

[0003] The existing arc protection system generally adopts the integration of various circuit components such as inverters and Hall sensors. When an arc fault occurs in the circuit, the circuit breaker structure in the protection system is tripped by utilizing the information transmission of the sensor and the current increase caused by the arc in the circuit. The circuit is disconnected to disconnect the voltage and cut off the current in the circuit, so that the arc phenomenon stops, avoiding the increase of current and light intensity caused by the arc, which causes the circuit to be damaged by high temperature.

[0004] In the actual process, if a circuit breaker facility is set up with circuit elements such as sensors, the monitoring and signal transmission of the sensors can be used to enable their own startup control to disconnect the circuit;

[0005] It is necessary to carry out innovative design based on the original photovoltaic power generation DC arc protection system, and additionally set up a self-starting mechanism for the circuit breaker, so that during the use of the circuit breaker, in addition to the control of the sensor and its supporting electrical components, it also has an additional self-circuit breaking protection effect. By utilizing the current increase reaction in the arc phenomenon, the circuit breaker can quickly self-start and disconnect the circuit, which is independent of the sensor's control facilities, and provide secondary protection for the circuit, thereby improving the safety of the circuit during use and reducing arc protection obstacles caused by external environmental factors. Summary of the invention

[0006] The purpose of the present invention is to provide a photovoltaic power generation DC arc protection system to solve the problem that the existing photovoltaic power generation DC arc protection system has a single circuit breaker activation function and cannot utilize the current changes during the arc phenomenon to realize the self-starting operation of the circuit breaker facility and achieve further safety protection of the circuit, except that electrical components such as sensors monitor and disconnect the circuit.

[0007] To achieve the above object, the present invention provides the following technical solution: a photovoltaic power generation DC arc protection system, the system uses a power-off device, including:

[0008] The cabinet has a first connector and a second connector installed at the bottom and top of the cabinet, respectively. The first connector and the second connector are provided with a lower terminal and an upper terminal on opposite sides thereof, and a power connector is movably installed on the lower terminal.

[0009] It also includes: an adjustment chamber, which is embedded in the middle of the lower terminal, an electric push rod assembly is installed on the adjustment chamber, and a first liquid chamber and a second liquid chamber that are interconnected are also provided in the adjustment chamber, a push rod member is movably installed in the first liquid chamber, and the push rod member is meshed and connected with a gear sleeve in the middle section of the central shaft at the rotating connection of the power-on joint;

[0010] The electromagnetic driving component is arranged in the second liquid chamber, and utilizes the current increase principle of the arc effect to drive the energized connector to move and cut off the power.

[0011] Preferably, the lower wiring terminal and the upper wiring terminal are both made of insulating material, and a gasket that fits and contacts each other is provided between adjacent portions of the lower wiring terminal and the upper wiring terminal;

[0012] The power-on connector on the lower wiring terminal is electrically connected to a corresponding power-on base on the upper wiring terminal.

[0013] Preferably, the power connectors are symmetrically distributed about the vertical center axis of the lower terminal block, and the two power connectors are vertically fixedly connected to the same rotating central axis, and the central axis and the adjustment cavity are installed in a through-bearing manner.

[0014] Preferably, the electric push rod assembly is positioned as a whole on the outer side wall of the lower terminal, and a sealing plate is fixed on the end of the output shaft of the electric push rod assembly. The sealing plate and the inside of the regulating chamber are set to be a sealed and fitted sliding lifting connection to adjust the hydraulic state inside the regulating chamber.

[0015] Preferably, the regulating chamber, the first liquid chamber and the second liquid chamber are connected to each other, and the internal volumes of the first liquid chamber and the second liquid chamber are equal, and hydraulic oil is arranged inside the regulating chamber.

[0016] Preferably, the push rod member is arranged as a whole in a "T"-shaped state, wherein a sealing and fitting sliding lifting connection is arranged between the "T"-shaped upper end outer wall of the push rod member and the inner wall of the first liquid chamber.

[0017] Preferably, the electromagnetic driving component includes an electromagnet fixed in the adjustment cavity, wherein the electromagnet is connected to the circuit where the power-on connector is located in cooperation with a resistor, and an extended iron core is fixed to the upper end of the internal iron core of the electromagnet, and the extended iron core is arranged in the second liquid cavity. At the same time, a liquid sealing plug is slidably installed on the outer side of the extended iron core, and the liquid sealing plug is limited by a blocking block fixed inside the second liquid cavity, and the liquid sealing plug adjusts the internal pressure state of the second liquid cavity.

[0018] Preferably, the extended iron core and the second liquid chamber are arranged to be vertically coaxially distributed, the liquid sealing plug and the second liquid chamber are in a sealed sliding lifting connection, and an embedded hidden magnetic ring is provided at the penetration point between the liquid sealing plug and the extended iron core.

[0019] Preferably, the barrier block is symmetrically embedded in the second liquid cavity on the left and right sides of the bottom of the liquid seal plug, and a telescopically movable extension block is installed through the side of the barrier block facing the extended iron core, an elastic member is fixed between the extension block and the inside of the barrier block, and a permanent magnet sheet is arranged on the side of the extension block facing the extended iron core;

[0020] The extended iron core generates magnetism after the electromagnet is activated, which is the same as the magnetic setting of the opposite sides of the permanent magnet sheet and the magnetic ring. A permanent magnet is arranged on the side of the liquid sealing plug facing the top of the electromagnet.

[0021] Preferably, a rotating cavity is fixed on the outside of the rotating connection between the rotating middle axis of the power-on connector and the lower terminal, an arc-extinguishing rod is rotatably installed on the outside of the rotating cavity below the power-on connector, and a mutually meshing transmission gear is installed between the arc-extinguishing rod and the rotating middle axis of the power-on connector;

[0022] A grounding wire is arranged on the arc extinguishing rod, and the arc extinguishing rod and the energized joint are mutually offset in the vertical projection plane.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: the photovoltaic power generation DC arc protection system utilizes the current change during the arc phenomenon to enable the circuit breaker component of the system to quickly self-start, so that the system can quickly disconnect the circuit, realize arc protection, and improve the safety of circuit use. The specific methods are as follows:

[0024] 1. By enabling the extension and retraction of the electric push rod assembly on the adjustment chamber, the hydraulic state inside the adjustment chamber is controlled, and then the lifting and lowering of the push rod member and its meshing with the gear sleeve are driven, so as to achieve the position movement adjustment of the energized joint under the normal use state and the closing and disconnection control of the circuit in which it is located. At the same time, the first liquid chamber and the second liquid chamber and the electromagnet are controlled through the arrangement. When the current increases due to the arc phenomenon in the circuit, and the current increase exceeds the preset threshold value of the resistor in series with the electromagnet, the electromagnet is driven to generate magnetism under the action of the large current, so that the liquid sealing plug is moved and changed in position under the action of the magnetic attraction of the permanent magnet and the electromagnet on it, the hydraulic pressure inside the first liquid chamber and the second liquid chamber is adjusted, the rotation of the energized joint under the action of the lifting height of the push rod member is changed, the closed state of the circuit is adjusted, and arc protection is performed;

[0025] Furthermore, when no arcing occurs, the liquid seal plug is locked and positioned in the second liquid chamber, and only the hydraulic state inside the second liquid chamber is adjusted by the extension and retraction of the electric push rod assembly. When the electromagnet is started under the arcing phenomenon, the connection setting of the electromagnet and the extended iron core is utilized to make the extended iron core generate synchronous magnetism, and under the action of magnetism, the extended iron core and the magnetic ring hidden and installed in the liquid seal plug repel each other with the same poles, so that the liquid seal plug can slide better. At the same time, the magnetism of the extended iron core also drives the extension block on the barrier block to contract under the action of the magnetic same-pole repulsion, so as to release the positioning limit of the liquid seal plug in the contracted state.

[0026] 2. At the same time, the technical solution also provides an arc-extinguishing rod that is used synchronously with the energized connector. The arc-extinguishing rod is used by utilizing the meshing transmission between gears. When the energized connector rotates, the arc-extinguishing rod is driven in reverse to rotate, thereby achieving synchronous reverse movement of the arc-extinguishing rod and the energized connector when they are installed in a misaligned manner. When the energized connector closes and disconnects the circuit, the arc-extinguishing rod is used synchronously, and the external magnetic setting of the arc-extinguishing rod is utilized to achieve the arc-extinguishing effect of disconnecting the circuit when the energized connector is in use, thereby reducing the safety hazard of arc breakdown during the circuit breaking process of the energized connector. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the front structure of the present invention;

[0028] Figure 2 It is a front cross-sectional structural schematic diagram of the present invention;

[0029] Figure 3 It is a schematic diagram of the side cross-sectional structure of the present invention;

[0030] Figure 4 This is a schematic diagram of the distribution structure of the lower wiring terminals and the upper wiring terminals of the present invention;

[0031] Figure 5 This is a schematic diagram of the front structure of the interior of the regulating chamber of the present invention;

[0032] Figure 6 This is a schematic diagram of the installation distribution structure of the liquid sealing plug of the present invention;

[0033] Figure 7 This is a schematic diagram of the barrier block structure of the present invention;

[0034] Figure 8 This is a schematic diagram of the internal side structure of the regulating chamber of the present invention;

[0035] Fig. 9 This is a schematic diagram of the distribution structure of the energized connector and the arc extinguishing rod of the present invention;

[0036] Fig.10 It is a schematic diagram of the arc extinguishing rod installation structure of the present invention.

[0037] In the figure: 1. cabinet; 2. first connector; 3. second connector; 4. lower terminal; 5. upper terminal; 6. power connector; 601. rotating cavity; 602. arc extinguishing rod; 603. transmission gear; 7. adjusting cavity; 8. electric push rod assembly; 9. first liquid cavity; 10. second liquid cavity; 11. push rod; 12. gear sleeve; 13. electromagnet; 1301. extended iron core; 14. liquid sealing plug; 15. barrier block; 1501. overhanging block; 1502. permanent magnet sheet. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Example 1: Please refer to Figure 1-Figure 8 The present invention provides a technical solution: a photovoltaic power generation DC arc protection system, the system uses a power-off device, including:

[0040] A cabinet 1, wherein the first wiring connector 2 and the second wiring connector 3 are respectively installed at the bottom and the top of the cabinet, and the opposite surfaces of the first wiring connector 2 and the second wiring connector 3 are respectively provided with a lower wiring terminal 4 and an upper wiring terminal 5, and at the same time, an electric connector 6 is movably installed on the lower wiring terminal 4; the lower wiring terminal 4 and the upper wiring terminal 5 are both made of insulating materials, and gaskets that fit and contact each other are provided between the adjacent parts of the lower wiring terminal 4 and the upper wiring terminal 5; the electric connector 6 on the lower wiring terminal 4 is electrically connected to the corresponding electric base provided on the upper wiring terminal 5; the electric connector 6 is symmetrically distributed about the vertical central axis of the lower wiring terminal 4, and the two electric connectors 6 are vertically fixedly connected to the same rotating central axis, and the central axis and the adjustment cavity 7 are installed by through-bearing;

[0041] Using the above technical solution, such as Figure 1-Figure 4 As shown, the first connector 2 and the second connector 3 are used for wiring operation, and at the same time, the lower terminal 4 and the upper terminal 5 are respectively controlled to close and open the circuit through the power connector 6 and the power base thereon, wherein the two power connectors 6 are connected by the same central axis, which facilitates the synchronous control of the two power connectors 6;

[0042] The technical scheme also includes: an adjusting chamber 7, which is embedded in the middle of the lower terminal 4, an electric push rod assembly 8 is installed on the adjusting chamber 7, and a first liquid chamber 9 and a second liquid chamber 10 that are mutually interpenetrating are also provided in the adjusting chamber 7, a push rod member 11 is movably installed in the first liquid chamber 9, and the push rod member 11 is meshedly connected with a gear sleeve 12 in the middle section of the central axis of the rotating connection of the power supply connector 6; the electric push rod assembly 8 is positioned as a whole on the outer wall of the lower terminal 4, and a sealing plate is fixed on the end of the output shaft of the electric push rod assembly 8, and the sealing plate and the inside of the adjusting chamber 7 are set to be a sealed and fitted sliding lifting connection to adjust the hydraulic state inside the adjusting chamber 7;

[0043] The use of the above technical solution controls the hydraulic state inside the regulating chamber 7 through the telescopic movement of the electric push rod assembly 8. Under normal conditions, the electric push rod assembly 8 is telescopic, so that the push rod member 11 is lifted and lowered under the action of hydraulic control, and the meshing of the push rod member 11 and the gear sleeve 12 is used to drive the energized connector 6 to rotate and close or disconnect the circuit, which is convenient to operate.

[0044] At the same time Figure 5-Figure 8As shown, the present technical solution also provides an electromagnetic driving component, which is arranged in the second liquid chamber 10, and uses the current increase principle of the arc effect to drive the energized connector 6 to move and cut off the power; the electromagnetic driving component includes an electromagnet 13 fixed in the adjustment chamber 7, wherein the electromagnet 13 is connected to the circuit where the energized connector 6 is located in cooperation with a resistor, and an extended iron core 1301 is fixed to the upper end of the internal iron core of the electromagnet 13, and the extended iron core 1301 is arranged in the second liquid chamber 10, and at the same time, a liquid sealing plug 14 is slidably installed on the outer side of the extended iron core 1301, and the liquid sealing plug 14 is limited by a blocking block 15 fixed in the second liquid chamber 10, and the liquid sealing plug 14 adjusts the internal pressure state of the second liquid chamber 10; the extended iron core 1301 and the second liquid chamber 10 are arranged to be vertically coaxially distributed, and the liquid sealing plug 14 is vertically coaxially distributed with the second liquid chamber 10. 0 is a sealed sliding lifting connection, and an embedded hidden magnetic ring is provided at the penetration point between the liquid sealing plug 14 and the extended iron core 1301; the barrier block 15 is symmetrically embedded in the second liquid chamber 10 on the left and right sides of the bottom of the liquid sealing plug 14, and the barrier block 15 is penetrated by a telescopic movable extension block 1501 on the side facing the extended iron core 1301, and an elastic member is fixed between the extension block 1501 and the inside of the barrier block 15, and a permanent magnet sheet 1502 is provided on the side of the extension block 1501 facing the extended iron core 1301; the extended iron core 1301 generates magnetism after the electromagnet 13 is activated to generate magnetism, and the magnetic settings of the opposite surfaces of the extended iron core 1301, the permanent magnet sheet 1502 and the annular inner wall of the magnetic ring are the same, and a permanent magnet is provided on the side of the liquid sealing plug 14 facing the top of the electromagnet 13;

[0045] Furthermore, in the technical solution, the regulating chamber 7, the first liquid chamber 9 and the second liquid chamber 10 are connected to each other, and the internal volumes of the first liquid chamber 9 and the second liquid chamber 10 are equal, and hydraulic oil is arranged inside the regulating chamber 7; the push rod member 11 is arranged in a "T" shape as a whole, wherein the "T"-shaped upper end outer wall of the push rod member 11 and the inner wall of the first liquid chamber 9 are arranged to be a sealed sliding lifting connection;

[0046] When the above technical solution is used, when an arc fault occurs in the circuit, the current in the circuit will increase. After the current increases and exceeds the preset threshold value of the resistor in the series circuit of the electromagnet 13, the electromagnet 13 is turned on from a silent state and generates working magnetism. Its working magnetism makes the extended iron core 1301 synchronously magnetic. The magnetism is generated by the electromagnetism phenomenon. The magnetism of the extended iron core 1301 can firstly cause the extended iron core 1301 and the permanent magnet sheet 1502 to have magnetic same-pole repulsion, so that the protruding block 1501 shrinks into the blocking block 15, and no longer restricts the positioning state of the liquid sealing plug 14. At the same time, the extended iron core 1301 will also produce magnetic repulsion with the magnetic ring hidden in the liquid sealing plug 14, so that the liquid sealing plug 14 can be extended. The outside of the long iron core 1301 slides stably, and the permanent magnet arranged at the bottom of the liquid sealing plug 14 and the upper end surface of the electromagnet 13 are attracted by the same poles, so that the liquid sealing plug 14 slides downward along the extended iron core 1301, changing the hydraulic state inside the second liquid chamber 10, and the electric push rod assembly 8 is working and stationary at this time. Under the action of the hydraulic pressure, the oil inside the first liquid chamber 9 is introduced into the second liquid chamber 10, so that the push rod member 11 rises, causing the energized connector 6 to rotate under the action of the meshing transmission, and the energized connector 6 disconnects the circuit where it is located, achieving the protection effect of disconnecting the circuit due to the arc phenomenon; in addition, the electromagnetic drive component can also be set to a structure that generates a temperature rise fuse under the action of the increased current, and releases the restriction of the push rod member 11 through thermal melting, so that it is reset under the action of the elastic member.

[0047] Embodiment 2: Based on Embodiment 1, the present invention is also as follows Fig. 9 and Fig.10 As shown, it is further disclosed that a rotating cavity 601 is fixed on the outer side of the rotating middle axis of the power connector 6 and the rotating connection point of the lower terminal 4, and an arc extinguishing rod 602 is rotatably installed on the outer side of the rotating cavity 601 below the power connector 6, and a mutually meshing transmission gear 603 is installed between the arc extinguishing rod 602 and the rotating middle axis of the power connector 6;

[0048] A grounding wire is provided on the arc extinguishing rod 602, and the arc extinguishing rod 602 and the energizing connector 6 are mutually offset in the vertical projection plane;

[0049] The use of the above-mentioned technical solution enables the energized connector 6 to rotate around its rotational axis and disconnect the circuit in which it is located. The rotational axis of the energized connector 6 drives the arc extinguishing rod 602 to rotate synchronously in the opposite direction through the transmission gear 603, so that the arc extinguishing rod 602 moves toward the circuit connection disconnected by the energized connector 6. The arc extinguishing rod 602 adopts an external magnetic setting, so that when the energized connector 6 disconnects the circuit in which it is located, an arc is generated between the two electrode plates, which can release the arc extinguishing rod 602, thereby reducing the hazard of arc breakdown during the circuit disconnection process.

[0050] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A photovoltaic power generation DC arc protection system, the system using a power-off device, comprising: A cabinet (1) is provided with a first connector (2) and a second connector (3) at the bottom and top of the cabinet, respectively; lower connecting terminals (4) and upper connecting terminals (5) are provided on opposite sides of the first connecting terminals (2) and the second connecting terminals (3), respectively; and a power supply connector (6) is movably installed on the lower connecting terminal (4); It is characterized by further comprising: An adjusting chamber (7) is embedded in the middle of the lower wiring terminal (4), an electric push rod assembly (8) is installed on the adjusting chamber (7), and a first liquid chamber (9) and a second liquid chamber (10) which are interconnected are also provided in the adjusting chamber (7), a push rod member (11) is movably installed in the first liquid chamber (9), and the push rod member (11) is meshedly connected with a gear sleeve (12) in the middle section of the central shaft at the rotating connection of the power supply connector (6); An electromagnetic drive component is arranged in the second liquid chamber (10) and uses the current increase principle of the arc effect to drive the energized connector (6) to move and cut off the power; the electromagnetic drive component comprises an electromagnet (13) fixed in the regulating chamber (7), wherein the electromagnet (13) cooperates with a resistor to be connected to the circuit where the energized connector (6) is located, and an extended iron core (1301) is fixed to the upper end of the internal iron core of the electromagnet (13), and the extended iron core (1301) is arranged in the second liquid chamber (10), and a liquid sealing plug (14) is slidably installed on the outer side of the extended iron core (1301), and the liquid sealing plug (14) is 4) being limited by a barrier block (15) fixed inside the second liquid chamber (10), the liquid sealing plug (14) adjusts the internal pressure state of the second liquid chamber (10); and an embedded hidden magnetic ring is provided at the penetration point between the liquid sealing plug (14) and the extended iron core (1301); a telescopically movable extension block (1501) is penetrated through the side of the barrier block (15) facing the extended iron core (1301), an elastic member is fixed between the extension block (1501) and the inside of the barrier block (15), and a permanent magnetic sheet (1502) is provided on the side of the extension block (1501) facing the extended iron core (1301); The extended iron core (1301) generates magnetism after the electromagnet (13) is activated to generate magnetism, and the extended iron core (1301) has the same magnetic setting as the permanent magnet sheet (1502) and the facing surface of the annular inner wall of the magnetic ring, and a permanent magnet is provided on one surface of the liquid sealing plug (14) facing the top of the electromagnet (13).

2. A photovoltaic power generation DC arc protection system according to claim 1, characterized in that: The lower wiring terminal (4) and the upper wiring terminal (5) are both made of insulating material, and gaskets that fit in and abut against each other are provided between adjacent portions of the lower wiring terminal (4) and the upper wiring terminal (5); The power-on connector (6) on the lower wiring terminal (4) is electrically connected to a corresponding power-on base on the upper wiring terminal (5).

3. A photovoltaic power generation DC arc protection system according to claim 1 or 2, characterized in that: The power supply connectors (6) are symmetrically distributed about the vertical center axis of the lower wiring terminal (4), and the two power supply connectors (6) are vertically fixedly connected to the same rotating central axis, and the central axis and the adjustment cavity (7) are installed in a through-bearing manner.

4. A photovoltaic power generation DC arc protection system according to claim 1, characterized in that: The electric push rod assembly (8) is positioned as a whole on the outer side wall of the lower wiring terminal (4), and a sealing plate is fixed to the end of the output shaft of the electric push rod assembly (8), and the sealing plate and the inside of the regulating chamber (7) are arranged in a sealed and fitted sliding lifting connection to adjust the hydraulic state inside the regulating chamber (7).

5. A photovoltaic power generation DC arc protection system according to claim 1 or 4, characterized in that: The regulating chamber (7), the first liquid chamber (9) and the second liquid chamber (10) are arranged to be interconnected, and the internal volumes of the first liquid chamber (9) and the second liquid chamber (10) are equal. Hydraulic oil is arranged inside the regulating chamber (7).

6. A photovoltaic power generation DC arc protection system according to claim 5, characterized in that: The push rod member (11) is arranged as a whole in a "T"-shaped state, wherein a sealing sliding lifting connection is arranged between the outer wall of the "T"-shaped upper end of the push rod member (11) and the inner wall of the first liquid chamber (9).

7. A photovoltaic power generation DC arc protection system according to claim 1, characterized in that: The extended iron core (1301) and the second liquid chamber (10) are arranged to be vertically coaxially distributed, and the liquid sealing plug (14) and the second liquid chamber (10) are in a sealed sliding lifting connection.

8. A photovoltaic power generation DC arc protection system according to claim 7, characterized in that: The barrier blocks (15) are symmetrically embedded in the second liquid chambers (10) on the left and right sides of the bottom of the liquid sealing plug (14).

9. A photovoltaic power generation DC arc protection system according to claim 1, characterized in that: A rotating cavity (601) is also fixed on the outside of the rotating connection between the rotating central axis of the power-on connector (6) and the lower connecting terminal (4); an arc-extinguishing rod (602) is also rotatably mounted on the outside of the rotating cavity (601) below the power-on connector (6); and a mutually meshing transmission gear (603) is mounted between the arc-extinguishing rod (602) and the rotating central axis of the power-on connector (6); A grounding wire is provided on the arc extinguishing rod (602), and the arc extinguishing rod (602) and the energizing connector (6) are mutually offset in a vertical projection plane.

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