Photovoltaic power station short circuit alarm device

Abstract

The utility model discloses a photovoltaic power station short circuit alarm device, which relates to the technical field of photovoltaic power station monitoring, and comprises a junction box, a control box and a mobile terminal, a power-off mechanism is arranged in the junction box and is used for cutting off power when a line is in short circuit, and the power-off mechanism comprises a power-off valve and a temperature sensing module; a photovoltaic panel circuit connected with the power-off valve and the photovoltaic panel penetrates through the temperature sensing module; an alarm signal transmitting module and a control module are arranged in the control box, and the alarm signal transmitting module and the control module are in signal connection with the mobile terminal through an antenna fixedly connected above the control box; the upper portion of the control box is further fixedly connected with an audible and visual alarm, and the audible and visual alarm is electrically connected with the control module. According to the alarm device, the temperature sensing module is used for monitoring whether abnormal high temperature occurs or not, so that power failure is controlled, and fire is prevented. The device is simple in structure and practical in function, and can be widely applied to various photovoltaic power stations.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic power station monitoring, and particularly relates to a short - circuit alarm device for a photovoltaic power station. Background Technique

[0002] The short - circuit of a photovoltaic power station is also called island short - circuit. With the continuous expansion of the scale of photovoltaic new energy grid connection, there are several photovoltaic power stations connected to the load side of the transformer sub - station area. When the power generation load is balanced with the power consumption load, that is, when the high - voltage switch is disconnected, the photovoltaic power station continues to supply power to the load of this sub - station area (this state is the "island" operation). It is not until the balance between power generation and power consumption load is broken and the voltage or frequency detected by the photovoltaic power station exceeds the limit that the photovoltaic power station can trip and disconnect the power supply. The consequences of this state are extremely serious.

[0003] However, when the "island" situation occurs, due to the increase in power generation at the joint, the energy consumption at the wire joint becomes too large, which easily causes the temperature at the joint to rise rapidly. When the temperature rises to a certain level, a fire may occur, affecting the normal use of the device. The current anti - island short - circuit and fire - prevention devices generally detect through temperature sensors. When the temperature reaches a certain level, the temperature is timely feedback and an alarm is given. However, during this process, the fire has already occurred. By the time the treatment personnel arrive, the fire may damage other devices, causing property losses. Moreover, when workers receive the alarm from the alarm system, it is extremely difficult to find the photovoltaic panel with island short - circuit among numerous photovoltaic arrays.

[0004] Therefore, it is necessary to propose a short - circuit alarm device for a photovoltaic power station to solve the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide a short - circuit alarm device for a photovoltaic power station to solve the above - mentioned technical problems existing in the prior art.

[0006] To achieve the above purpose, the utility model provides the following scheme:

[0007] A short - circuit alarm device for a photovoltaic power station includes a junction box, a control box, and a mobile terminal. Inside the junction box, there is a power - off mechanism for power - off during line short - circuit. The power - off mechanism includes a power - off valve and a temperature sensing module. The photovoltaic panel line connecting the power - off valve and the photovoltaic panel passes through the temperature sensing module. Inside the control box, there is an alarm signal transmitting module and a control module. The alarm signal transmitting module and the control module are connected to the mobile terminal through an antenna fixedly connected above the control box. An audible and visual alarm is also fixedly connected above the control box, and the audible and visual alarm is electrically connected to the control module.

[0008] The above structure aims to propose a short - circuit alarm device for a photovoltaic power station, which includes a junction box, a control box and a mobile terminal. A power - off mechanism is arranged inside the junction box. The power - off mechanism is used to cut off the power when heat is generated due to a short - circuit in the line. The power - off mechanism includes a power - off valve and a temperature - sensing module. The lower end of the power - off valve is electrically connected to a photovoltaic panel line, and the other end of the photovoltaic panel line is electrically connected to the photovoltaic panel. When the temperature - sensing module detects high temperature, the power - off valve will cut off the power to prevent a fire. The alarm - signal transmitting module and the antenna wirelessly connect the control module with the mobile terminal. The mobile terminal is used to control the sound and light alarm to emit an alarm signal, achieving the positioning effect and performing maintenance on it. The alarm device of the present utility model has a simple structure and practical functions, and can be widely applied to various photovoltaic power stations.

[0009] As a preferred embodiment, one side of the power - off valve is electrically connected to a main line, and the main line passes through the back of the junction box and leads out to a grid - connected inverter or an electrical device.

[0010] As a preferred embodiment, a wire groove box is fixedly connected to the back of the junction box, and the main line is arranged in the wire groove box.

[0011] As a preferred embodiment, a support frame is fixedly connected to the lower end of the wire groove box, and the lower end of the support frame is inserted and fixed on the ground or an external base.

[0012] As a preferred embodiment, a through - hole running through the upper and lower parts is opened inside the temperature - sensing module. The through - hole is adapted to the diameter of the photovoltaic panel line, and the photovoltaic panel line sequentially passes through the junction box and the through - hole from the bottom of the junction box and enters and is connected to the power - off valve.

[0013] As a preferred embodiment, the photovoltaic panel line is hermetically sleeved with the bottom of the junction box.

[0014] As a preferred embodiment, a cover plate is hinged at the front - end opening of the junction box, and a rubber sealing ring is padded between the cover plate and the junction box.

[0015] As a preferred embodiment, a GPS locator is further arranged inside the control box, and the GPS locator is wirelessly connected to the mobile terminal.

[0016] Compared with the prior art, the present utility model discloses at least the following beneficial effects:

[0017] The utility model adopts a junction box and installs a power-off valve inside the junction box. The power-off valve is used to connect the main circuit and the photovoltaic panel circuit. When the temperature sensing module detects high temperature, the control module will control the power-off valve to cut off the power to prevent fire. At the same time, an alarm signal transmitting module and an antenna are used to wirelessly connect the control module with the mobile terminal in the hands of maintenance personnel. By operating the mobile terminal, the audible and visual alarm is controlled to emit an alarm signal, so as to achieve the positioning effect, making it easier for maintenance personnel to determine the fault location and repair it. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 is a structural schematic diagram of the short-circuit alarm device for a photovoltaic power station of the present utility model;

[0020] Figure 2 is an internal structure diagram of the short-circuit alarm device for a photovoltaic power station of the present utility model;

[0021] Figure 3 is a sectional view of the control box in the short-circuit alarm device for a photovoltaic power station of the present utility model;

[0022] Figure 4 is an alarm flow chart of the short-circuit alarm device for a photovoltaic power station of the present utility model;

[0023] In the figure: 1, wire trough box; 2, support frame; 3, cover plate; 4, junction box; 5, control box; 6, antenna; 7, audible and visual alarm; 8, mobile terminal; 9, power-off valve; 10, temperature sensing module; 11, photovoltaic panel circuit; 12, main circuit; 13, alarm signal transmitting module; 14, control module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0025] In order to make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0026] Referring to Figures 1 to 4 As shown, the present utility model provides a short - circuit alarm device for a photovoltaic power station, including a junction box 4, a control box 5, a cable trough box 1 and a mobile terminal 8. A power - off mechanism is arranged inside the junction box 4, and the power - off mechanism is used to cut off the power when heat is generated due to a short - circuit in the circuit. The power - off mechanism includes a power - off valve 9 and a temperature sensing module 10. The lower end of the power - off valve 9 is electrically connected to a photovoltaic panel line 11, and the other end of the photovoltaic panel line 11 is electrically connected to a photovoltaic panel. And one side of the power - off valve 9 is electrically connected to a main line 12. The main line 12 penetrates the back of the junction box 4 and the cable trough box 1 and is arranged inside the cable trough box 1, and is gathered to a grid - connected inverter, a storage battery or an electrical equipment through the cable trough box 1. The temperature sensing module 10 is internally provided with a through - hole penetrating up and down, and the through - hole corresponds to the diameter of the photovoltaic panel line 11. The photovoltaic panel line 11 sequentially penetrates the junction box 4 and the through - hole from the bottom of the junction box 4 and enters, and is connected to the power - off valve 9, and the photovoltaic panel line 11 is hermetically sleeved with the bottom of the junction box 4.

[0027] In this embodiment, a junction box 4 is additionally provided in the photovoltaic power station, and a power - off valve 9 is installed inside the junction box 4. The main line 12 and the photovoltaic panel line 11 are connected through the power - off valve 9. When the temperature sensing module 10 detects high temperature, the control module 14 will control the power - off valve 9 to cut off the power to prevent a fire. Specifically, in actual application, after the control module 14 receives the temperature monitoring value transmitted by the temperature sensing module, it compares it with the built - in temperature threshold. When the temperature monitoring value exceeds the temperature threshold, it is determined that the temperature of the line is too high and there is a risk of fire. Then the control module 14 sends a power - off signal to the power - off valve 9 to cut off the line in time.

[0028] As Figures 1 to 4 shown, in a specific embodiment, the upper end of the junction box 4 is fixedly connected to a control box 5. The upper end of the control box 5 is fixedly connected with an antenna 6 and an audible and visual alarm 7 from left to right, and an alarm signal transmitting module 13 and a control module 14 are fixedly installed inside the control box 5.

[0029] In the above - mentioned specific embodiment, the alarm signal transmitting module 13 and the antenna 6 are simultaneously used to wirelessly connect the control module 14 with the mobile terminal 8 in the hands of maintenance personnel. By operating the mobile terminal 8, the audible and visual alarm 7 is controlled to emit an alarm signal, so as to achieve a positioning effect, making it easier for maintenance personnel to determine the fault location and repair it.

[0030] As Figures 1 to 4As shown, in a specific embodiment, a cover plate 3 is movably connected to the front opening of the junction box 4 through a hinge. A rubber sealing ring is padded between the cover plate 3 and the junction box 4, and the back of the junction box 4 is fixedly connected to the wire duct box 1. The lower end of the wire duct box 1 is fixedly connected to a support frame 2, and the lower end of the support frame 2 is inserted and fixed on the ground or fixed on an external base.

[0031] In the above specific embodiment, the wire duct box 1 is for organizing, installing, and protecting the main circuit 12 inside; the temperature sensing module 10 is for monitoring the temperature condition of the photovoltaic panel circuit 11.

[0032] As Figures 1 to 4 shown, in a specific embodiment, the control module 14 is electrically connected to the temperature sensing module 10, the power cut-off valve 9, the sound and light alarm 7, and the alarm signal transmitting module 13. Among them, the junction box 4 is for protecting the internal electrical components.

[0033] As Figures 1 to 4 shown, in a specific embodiment, the alarm signal transmitting module 13 is wirelessly connected to the mobile terminal 8 through the antenna 6, and the mobile terminal 8 sends instructions to the control module 14 through the antenna 6 and the alarm signal transmitting module 13, and controls the operation of the sound and light alarm 7 through the control module 14.

[0034] In the above specific embodiment, by operating the mobile terminal 8 to control the sound and light alarm 7 to emit an alarm signal, the positioning effect is achieved, making it easier for maintenance personnel to determine the fault location and perform maintenance on it.

[0035] In the above specific embodiment, a GPS locator is also provided inside the control box 5. The GPS locator is wirelessly connected to the mobile terminal 8 and is used to help the operation and maintenance personnel of the photovoltaic power station quickly locate the accurate location where the short circuit alarm occurs.

[0036] It should be understood that in the above embodiment, the power cut-off valve 9 can be a direct-acting solenoid valve, a step-by-step direct-acting solenoid valve, or a pilot-operated solenoid valve. In this embodiment, the power cut-off valve 9 includes an electromagnetic coil, a magnetic core, and at least one valve body. A valve core and a valve seat are provided inside the valve body, and the valve core and the valve seat cooperate to form a conducting circuit. The up and down movement of the valve core controls the on and off of the circuit. When powered on, the electromagnetic coil generates an electromagnetic force to lift the closing member from the valve seat, and the valve opens; when powered off, the electromagnetic force disappears, and the spring presses the closing member against the valve seat, and the valve closes. Of course, the power cut-off valve 9 with the above structure is only one possible embodiment, and other mechanical or electrical devices capable of realizing the on and off function can also be selected in actual applications.

[0037] It should also be understood that in practical applications, the temperature sensing module 10 includes at least one temperature sensor, such as a thermocouple. The temperature sensor is electrically connected to the control module 14, and the control module 14 is configured to control the driving mechanism based on the power-off signal identified by the temperature sensor, so that the valve core in the power-off valve 9 is disconnected from the valve seat.

[0038] The operating principle of the short-circuit alarm device for a photovoltaic power station in this embodiment is as follows:

[0039] The utility model adds a junction box 4 and installs a power-off valve 9 inside the junction box 4. The power-off valve 9 is used to connect the main line 12 and the photovoltaic panel line 11. When the temperature sensing module 10 detects high temperature, the control module 14 will control the power-off valve 9 to cut off the power to prevent fire; at the same time, the alarm signal transmitting module 13 and the antenna 6 are used to wirelessly connect the control module 14 with the mobile terminal 8 in the hands of maintenance personnel. By operating the mobile terminal 8, the sound and light alarm 7 is controlled to emit an alarm signal, so as to achieve the positioning effect, making it easier for maintenance personnel to determine the fault location and repair it; the junction box 4 is used to protect the internal electrical components, and the wire trough box 1 is used to arrange, install and protect the internal main line 12; the temperature sensing module 10 is used to monitor the temperature condition of the photovoltaic panel line 11.

[0040] The details not described in the present utility model are all conventional technical means well known to those skilled in the art.

[0041] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0042] The above-described embodiments are only descriptions of the preferred embodiments of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model should fall within the protection scope determined by the claims of the present utility model.

Claims

1. A photovoltaic power station short circuit alarm device, characterized in that: The invention comprises a junction box (4), a control box (5) and a mobile terminal (8); a power-off mechanism is arranged inside the junction box (4) for powering off when the line is short-circuited, and the power-off mechanism comprises a power-off valve (9) and a temperature sensing module (10); a photovoltaic panel line (11) connecting the power-off valve (9) and the photovoltaic panel runs through the temperature sensing module (10); an alarm signal transmitting module (13) and a control module (14) are arranged inside the control box (5); the alarm signal transmitting module (13) and the control module (14) are connected to the mobile terminal (8) by signals via an antenna (6) fixedly connected above the control box (5); an audible and visual alarm (7) is also fixedly connected above the control box (5); the audible and visual alarm (7) is electrically connected to the control module (14).

2. The photovoltaic power station short circuit alarm device according to claim 1, characterized in that: One side of the power cut-off valve (9) is electrically connected to a main line (12), and the main line (12) runs through the back of the junction box (4) and is led out to a grid-connected inverter or an electrical device.

3. The photovoltaic power station short circuit alarm device according to claim 2, characterized in that: The back of the junction box (4) is fixedly connected to a wire trough box (1), and the main line (12) is arranged in the wire trough box (1).

4. The photovoltaic power station short circuit alarm device according to claim 3, characterized in that: The lower end of the wire trough box (1) is fixedly connected to a support frame (2), and the lower end of the support frame (2) is plugged and fixed on the ground or on an external base.

5. The photovoltaic power station short circuit alarm device according to claim 1, characterized in that: The temperature sensing module (10) is provided with a through hole extending therethrough from top to bottom, the through hole being adapted to the diameter of the photovoltaic panel circuit (11), and the photovoltaic panel circuit (11) passes through the junction box (4) and the through hole in sequence from the bottom of the junction box (4) and enters into connection with the power-off valve (9).

6. The photovoltaic power station short circuit alarm device according to claim 5, characterized in that: The photovoltaic panel circuit (11) is sealed and sleeved with the bottom of the junction box (4).

7. The photovoltaic power station short circuit alarm device according to claim 1, characterized in that: A cover plate (3) is hingedly connected to the front opening of the junction box (4), and a rubber sealing ring is provided between the cover plate (3) and the junction box (4).

8. The photovoltaic power station short circuit alarm device according to claim 1, characterized in that: A GPS locator is also provided inside the control box (5), and the GPS locator is connected to the mobile terminal (8) via a wireless signal.

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