Substation grounding pile lock electric heating dehumidification device

Abstract

The present invention provides an electric heating dehumidification device for a substation grounding pile lock, comprising a rain cover fixedly arranged on the grounding pile lock when in use, a humidity sensor and an electric heating element fixedly arranged in the grounding pile lock, a battery and a circuit board fixedly arranged on the inner wall of the rain cover, and a solar panel arranged near the outside of the grounding pile lock; the circuit board is provided with a single-chip computer module, an electric heating element power on-off control module and a power conversion module; the single-chip computer module is electrically connected to the humidity sensor, the electric heating element power on-off control module is electrically connected to the single-chip computer module, and the electric heating element is electrically connected to the electric heating element power on-off control module; the power conversion module is electrically connected to the battery, and the battery is electrically connected to the solar panel. The present invention can automatically and timely remove moisture in the substation grounding pile lock when in use, and effectively solves the technical problem that the grounding pile lock DC grounding fault is easily caused by moisture in the grounding pile lock.

Description

Technical Field

[0001] The invention relates to the technical field of auxiliary facilities for preventing errors in transformer substations, and in particular to an electric heating and dehumidifying device for a grounding pile lock of a transformer substation. Background Art

[0002] The substation grounding pile lock is an important auxiliary facility in the substation that plays a role in preventing the grounding pile from being mistakenly grounded. The substation grounding pile lock generally consists of a shell and electrical components including an anti-error logic device, a locking circuit, and a remote signal circuit. The grounding pile lock is connected to the DC feeder screen and is located on the branch of the DC circuit of the entire substation. The substation grounding pile lock is generally set at a position close to the ground. During the use of the substation grounding pile lock, if a DC grounding fault occurs, it will cause the entire substation to be DC grounded, causing the substation to falsely alarm signals and protection malfunctions, refuse to operate, and the DC feeder switch tripping protection device to lose pressure. It may also cause some relays to short-circuit and fail to trip, resulting in over-level tripping, causing the accident to expand, endangering the life safety of operators during the maintenance process and the safe and stable operation of the entire power grid during the power transmission process after the maintenance. The main reasons for the DC grounding fault of the substation grounding pile lock are: first, the grounding pile lock is infiltrated by rain or damp, which makes the inside of the grounding pile lock damp. The circuit device inside the grounding pile lock is in a humid environment for a long time, which reduces the external insulation performance and causes a direct grounding fault; second, the wire inside the grounding pile lock is overlapped with the outer shell; third, the wire core inside the grounding pile lock is short-circuited; fourth, the internal fault of the grounding pile lock. Among them, the rain infiltration or dampness of the grounding pile lock is the primary cause of the DC grounding fault of the substation grounding pile lock. To solve this problem, the current common practice is to install a rain cover on the outside of the grounding pile lock. Although it can better solve the problem of DC grounding fault of the grounding pile lock caused by water seepage of the grounding pile lock shell, due to the small and relatively closed internal space of the grounding pile lock, high humidity gas invades the inside of the grounding pile lock and is difficult to evaporate by itself. The statistics of the repair of DC grounding fault of the substation grounding pile lock show that the DC grounding fault of the grounding pile lock caused by the humid air inside the grounding pile lock accounts for more than 87.8%, which is the primary cause of the DC grounding fault of the substation grounding pile lock and is also a technical problem that needs to be solved urgently. Summary of the invention

[0003] The purpose of the present invention is to provide an electric heating dehumidification device for a substation grounding pile lock in view of the problems existing in the prior art, which can promptly remove moisture in the substation grounding pile lock when in use, and effectively solve the technical problem that the DC grounding fault of the grounding pile lock is easily caused by moisture in the grounding pile lock.

[0004] The technical solution of the present invention is: the electric heating dehumidification device of the substation grounding pile lock of the present invention comprises a rain cover fixedly arranged on the grounding pile lock when in use, and its structural characteristics are: it also comprises a humidity sensor and an electric heating element fixedly arranged on the inner wall of the outer shell of the grounding pile lock, a battery and a circuit board fixedly arranged on the inner wall of the rain cover, and a solar cell panel for power generation fixedly arranged near the outside of the grounding pile lock and the rain cover; the above-mentioned circuit board is provided with a single-chip microcomputer module for main control, an electric heating element power on-off control module for correspondingly controlling the power on and off of the electric heating element according to the instructions of the single-chip microcomputer module, and a power conversion module for converting the power output of the battery into the working power required by the single-chip microcomputer module and the electric heating element; the above-mentioned single-chip microcomputer module is electrically connected to the humidity sensor, the electric heating element power on-off control module is electrically connected to the single-chip microcomputer module, and the electric heating element is electrically connected to the electric heating element power on-off control module; the power conversion module is electrically connected to the battery, and the battery is electrically connected to the solar cell panel.

[0005] A further solution is: the above-mentioned circuit board is also provided with a display screen for displaying the current humidity and the set humidity threshold during use, and two humidity threshold adjustment buttons for adjusting the set humidity threshold; the display screen and the two humidity threshold adjustment buttons are electrically connected to the single-chip computer module respectively.

[0006] A further solution is: a middle partition is arranged inside the rain cover, and the middle partition is arranged between the battery and the circuit board and the grounding stake lock.

[0007] A further solution is that the electric heating element is a carbon fiber graphene electric heating film.

[0008] A further solution is: the above humidity sensor is a DHT11 capacitive humidity sensor.

[0009] The present invention has positive effects: (1) The electric heating and dehumidifying device for the grounding pile lock of the substation of the present invention, through the design of the overall structure, can not only block rain and moisture when in use, but more importantly, can automatically perform electric heating and dehumidification inside the grounding pile lock to ensure that the air humidity inside the grounding pile lock is less than the set humidity threshold, thereby effectively solving the technical problem in the prior art that the moisture inside the grounding pile lock easily causes DC grounding faults. Its use can greatly reduce the occurrence of DC grounding faults in the grounding pile lock. (2) The electric heating and dehumidifying device for the grounding pile lock of the substation of the present invention can still work normally for 5 days even in sunny weather, and has strong applicability. (3) The electric heating element of the grounding pile lock of the substation of the present invention adopts a carbon fiber graphene electric heating film with a small overall volume, a large heat dissipation area, a fast heat conduction speed and a slightly foldable structure, which can effectively adapt to the installation and use environment inside the grounding pile lock. (5) The electric heating and dehumidifying device for the grounding pile lock of the substation of the present invention has a simple overall structure, low cost, obvious effect, and is suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The figure is a schematic diagram of the overall structure of the present invention, which also schematically shows the installation relationship between the grounding stake lock and the rain cover, and the rain cover is longitudinally cut from the front end thereof;

[0011] Figure 2 It is a schematic block diagram of the circuit structure of the present invention.

[0012] The reference numerals in the above drawings are as follows:

[0013] Rain cover 1, middle partition 1-1; humidity sensor 2, electric heating element 3, solar panel 4, storage battery 5, circuit board 6, display screen 7, humidity threshold adjustment button 8;

[0014] Grounding stake lock 9, housing 9-1, electrical components 9-2. DETAILED DESCRIPTION

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] (Example 1)

[0017] The electric heating dehumidification device for the substation grounding pile lock of this embodiment is used for partially protecting the substation grounding pile lock from rain and partially dehumidifying the substation grounding pile lock, so as to minimize the DC grounding fault of the substation grounding pile lock.

[0018] See Figure 1 The grounding stake lock 9 is mainly composed of a housing 9-1 and an electrical component 9-2 arranged in the housing. The structure of the grounding stake lock 9 is the same as that of the prior art and will not be described in detail.

[0019] See Figure 1 and Figure 2 The substation grounding pile lock electric heating dehumidification device of this embodiment is mainly composed of a rain cover 1, a humidity sensor 2, an electric heating element 3, a solar panel 4, a battery 5, a circuit board 6, a display screen 7 and a humidity threshold adjustment button 8.

[0020] The rain cover 1 is a square box body with an opening at the lower end. The volume of the rain cover 1 is larger than the volume of the grounding pile lock 9. The rain cover 1 is fixedly arranged on the grounding pile lock 9. The rain cover 1 is used to protect the grounding pile lock 9 from rain from the outside to prevent rainwater from penetrating into the grounding pile lock 9. The aforementioned rain cover 1 is a prior art and will not be described in detail. However, as a preferred embodiment, different from the prior art, a middle partition 1-1 is further arranged in the rain cover 1 to isolate the battery 5 and the circuit board 6 in the device of this embodiment from the grounding pile lock 9 to avoid electromagnetic interference.

[0021] The humidity sensor 2 and the electric heater 3 are fixed on the inner wall of the housing 9-1 of the grounding pile lock 9. When in use, the humidity sensor 2 is used to detect the humidity in the housing 9-1 of the grounding pile lock 9 in real time. The humidity sensor 2 can adopt a commercially available AM2320 digital temperature and humidity sensor or a DHT11 capacitive humidity sensor. In this embodiment, from the perspective of cost, the DHT11 capacitive humidity sensor is preferably used. The electric heater 3 is used to heat and dehumidify the humid air in the housing 9-1 of the grounding pile lock 9. The electric heater 3 can adopt a common electric heating device such as a resistance wire. In this embodiment, the electric heater 3 preferably adopts a commercially available carbon fiber graphene electric heating film with a small overall volume, a large heat dissipation area, a fast heat conduction speed, and can be slightly folded for easy installation.

[0022] The solar panel 4 and the storage battery 5 are both commercially available. The solar panel 4 generates electricity using solar energy and transmits it to the storage battery 5 for storage. The combination of the solar panel 4 and the storage battery 5 for storing electricity is a mature existing technology and will not be described in detail. The solar panel 4 is fixedly arranged near the grounding stake lock 9 and the outside of the rain cover 1, and the storage battery 5 is fixedly arranged on the inner wall of the rain cover 1. The storage battery 5 is used to provide the working power supply of the device.

[0023] The circuit board 6 is fixedly mounted on the inner wall of the rain cover 1, and the circuit board 6 is provided with a single-chip microcomputer module, an electric heating element power on-off control module, and a power conversion module; the single-chip microcomputer module in this embodiment preferably adopts a single-chip microcomputer of the STM32 model, which has a built-in humidity judgment threshold. In this embodiment, the humidity threshold is set to 80%RH. The electric heating element power on-off control module is electrically connected to the single-chip microcomputer module, the single-chip microcomputer module is electrically connected to the humidity sensor 2, and the electric heating element 3 is electrically connected to the electric heating element power on-off control module; the power conversion module is used to convert the power output by the battery 5 into the power required by the single-chip microcomputer module and the electric heating element 3. The power conversion module is a mature existing technology, and its structure is not described in detail. The electric heating element power on-off control module can use a commercially available relay or MOS tube switch circuit.

[0024] The display screen 7 and the humidity threshold adjustment button 8 are set as the preferred mode; the display screen 7 and the humidity threshold adjustment button 8 are fixed on the circuit board 6, the display screen 7 and the humidity threshold adjustment button 8 are electrically connected to the single-chip computer module respectively, and the display screen 7 adopts a commercially available OLED display screen for displaying the current humidity and the set humidity threshold; there are two humidity threshold adjustment buttons 8 for increasing and decreasing the set humidity threshold to adapt to different working conditions during use, and the adjustment step of the humidity threshold adjustment button 8 is set to 1%RH.

[0025] In accordance with the above-mentioned preferred arrangement of a middle partition 1-1 in the rain cover 1, the middle partition 1-1 is arranged between the battery 5 and the circuit board 6 and the grounding stake lock 9 to isolate the battery 5 and the circuit board 6 in the device of this embodiment from the grounding stake lock 9 to avoid electromagnetic interference.

[0026] The working principle and process of the substation grounding pile lock electric heating dehumidification device of this embodiment are briefly described as follows:

[0027] The substation grounding pile lock electric heating dehumidification device of this embodiment, when in use, the electricity generated by the solar panel 4 is stored in the battery 5, and the battery 5 provides the working power for the device; when working, the humidity sensor 2 detects the humidity in the housing 9-1 of the grounding pile lock 9 in real time, and uploads the detection signal to the single-chip microcomputer module on the circuit board 6, and the single-chip microcomputer module compares the real-time humidity with the built-in set humidity threshold. If the real-time detected humidity reaches the set humidity threshold, the single-chip microcomputer module controls the electric heating element power on-off control module to operate, and turns on the power of the electric heating element 3. The electric heating element 3 heats and dehumidifies the humid air in the housing 9-1 of the grounding pile lock 9 by generating heat. When the humidity detected in real time by the humidity sensor 2 is less than the humidity threshold, the single-chip microcomputer module controls the electric heating element power on-off control module to operate, and turns off the power of the electric heating element 3 to stop heating. This is repeated, thereby effectively ensuring that the air humidity in the housing 9-1 of the grounding pile lock 9 is less than the set humidity threshold, thereby effectively solving the technical problem in the prior art that the DC grounding fault is easily caused by moisture in the grounding pile lock. It should be noted that the built-in program of the single-chip module is a simple and mature prior art. The device of this embodiment can work normally for 5 days even in the sunless weather, and can reduce the humidity in the housing 9-1 of the grounding pile lock 9 to below 80%RH, which can basically meet the actual use conditions.

[0028] The above embodiments are descriptions of specific implementation methods of the present invention rather than limitations of the present invention. Technical personnel in the relevant technical field can make various changes and modifications to obtain corresponding equivalent technical solutions without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should be included in the patent protection scope of the present invention.

Claims

1. An electric heating dehumidification device for a substation grounding pile lock, comprising a rain cover fixedly mounted on the grounding pile lock when in use, characterized in that: It also includes a humidity sensor and an electric heating element fixedly mounted on the inner wall of the shell of the grounding pile lock, a battery and a circuit board fixedly mounted on the inner wall of the rain cover, and a solar panel for power generation fixedly mounted near the outside of the grounding pile lock and the rain cover; the circuit board is provided with a single-chip microcomputer module for main control, an electric heating element power on-off control module for correspondingly controlling the power on and off of the electric heating element according to the instructions of the single-chip microcomputer module, and a power conversion module for converting the power output of the battery into the working power required by the single-chip microcomputer module and the electric heating element; the single-chip microcomputer module is electrically connected to the humidity sensor, the electric heating element power on-off control module is electrically connected to the single-chip microcomputer module, and the electric heating element is electrically connected to the electric heating element power on-off control module; the power conversion module is electrically connected to the battery, and the battery is electrically connected to the solar panel; A middle partition is provided in the rain cover, and the middle partition is provided between the battery and the circuit board and the grounding stake lock; The electric heating element is a carbon fiber graphene electric heating film; The circuit board is also provided with a display screen for displaying the current humidity and the set humidity threshold value during use, and two humidity threshold value adjustment buttons for adjusting the set humidity threshold value; the display screen and the two humidity threshold value adjustment buttons are electrically connected to the single chip microcomputer module respectively.

2. The substation grounding pile lock electric heating dehumidification device according to claim 1 is characterized by: The humidity sensor is a DHT11 capacitive humidity sensor.

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