Lightning arrester monitoring device

Abstract

The invention relates to the technical field of lightning protection of a power system, and discloses a lightning arrester monitoring device which comprises an online monitoring body connected with a three-phase lightning arrester, a plurality of ventilation pipes are arranged on the side wall of a shell of the online monitoring body, one end of an outlet of each ventilation pipe extends into the shell, and the other end of the outlet of each ventilation pipe extends into the shell. One end of the ventilation pipe located in the shell extends upwards in a reversing manner, and an outlet is formed in the top of the ventilation pipe; according to the device, the heat dissipation effect can be guaranteed, meanwhile, the probability that rainwater enters the device shell is effectively reduced, the operation stability of equipment is improved, and the operation safety of a power system is maintained.

Description

Technical Field

[0001] This invention relates to the field of lightning protection technology for power systems, and in particular to a surge arrester monitoring device. Background Technology

[0002] In the lightning protection system of power systems, surge arresters are key devices for suppressing lightning overvoltages and switching overvoltages, and their operating status directly affects the safe and stable operation of power lines and substation equipment. To monitor the operating status of surge arresters in real time and detect potential faults in a timely manner, the industry commonly uses online monitoring devices in conjunction with three-phase surge arresters. These monitoring devices have become one of the core equipment for condition-based maintenance of power systems. The core internal components of existing surge arrester online monitoring devices mainly include: a milliammeter for monitoring the leakage current of the surge arrester, which reflects the insulation status of the surge arrester by accurately collecting current signals; a mechanical or electronic action counter for recording the number of surge arrester actions, providing data support for fault tracing and life assessment; and circuits and signal processing components composed of signal acquisition modules, data processing chips, communication interfaces, etc., to realize the conversion, analysis and remote transmission of signals such as leakage current and action status, and finally complete the data visualization presentation through the back-end system, which is convenient for operation and maintenance personnel to monitor in real time. To ensure the stable performance of the aforementioned components during long-term operation, the monitoring device must possess excellent heat dissipation capabilities. If the heat generated by the components during operation cannot be dissipated in a timely manner, it will lead to an increase in internal temperature, thereby affecting measurement accuracy, shortening the lifespan of the components, and even causing circuit failures. Currently, the mainstream heat dissipation solution in the industry is to directly create through-vents in the housing of the monitoring device, utilizing air convection to achieve heat exchange between the inside and outside of the housing. However, surge arresters and their associated monitoring devices are typically installed outdoors, exposed to wind, rain, snow, and other natural weather conditions. The traditional ventilation hole structure described above has significant drawbacks: the ventilation holes directly penetrate the casing, allowing rainwater to easily seep into the interior. Furthermore, under wind conditions, the splashing and backflow of rainwater are even more pronounced. This seepage can cause internal components to become damp and short-circuit, leading to problems such as distorted milliammeter readings, false triggering of the action counter, and malfunctions in signal processing components. In severe cases, it can even render the entire monitoring device unusable, losing its monitoring function and posing a significant threat to the safe operation of the power system.

[0003] Therefore, there is an urgent need for a surge arrester monitoring device that can effectively prevent rainwater from entering the housing while ensuring the heat dissipation effect of the monitoring device. Summary of the Invention

[0004] The purpose of this invention is to provide a surge arrester monitoring device that can ensure heat dissipation while effectively reducing the probability of rainwater entering the device housing, thereby improving the stability of equipment operation and maintaining the safety of power system operation.

[0005] The present invention adopts the following technical solution: A surge arrester monitoring device includes an online monitoring body connected to a three-phase surge arrester. The online monitoring body has multiple ventilation pipes on its housing sidewall. One end of the outlet of each ventilation pipe extends into the housing. The end of the ventilation pipe located inside the housing extends upward and forms an outlet at the top.

[0006] Preferably, the inlet end of the ventilation duct is inclined downwards.

[0007] Preferably, a water collection pipe is provided at the top of the housing, and the bottom of the water collection pipe is connected to a guide pipe located inside the housing. The guide pipe is connected to the corresponding ventilation pipe through a water distribution pipe.

[0008] Preferably, the water distribution pipe is located below the outlet of the ventilation pipe.

[0009] Preferably, a water collection trough is provided on the top of the housing, and the top inlet of the water collection pipe is located in the water collection trough; a sealing cover is provided on the water collection trough, and the sealing cover is driven by a driving component provided in the housing; a rain sensor connected to the processor in the online monitoring body is provided on the housing.

[0010] Preferably, the driving component includes a threaded screw disposed within the housing, the threaded screw being driven by a motor, the motor being controlled to start and stop by the processor; a slider is disposed on the threaded screw, the slider being connected to a traction rod slidably disposed on the top of the housing, and one end of the traction rod located outside the housing being connected to the sealing cover.

[0011] Preferably, a filter screen is provided at the bottom of the water collection tank.

[0012] Preferably, a cleaning brush is provided at the bottom of the sealing cover.

[0013] Preferably, the sealing cap has a U-shaped structure.

[0014] Preferably, a sealing plate is elastically hinged inside the vent pipe at a position corresponding to the outlet of the water distribution pipe. When water flows from the water distribution pipe into the vent pipe, the sealing plate is pushed open, and its bottom end abuts against the inner wall of the vent pipe, forming a seal on the upper part of the outlet of the water distribution pipe.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention sets multiple ventilation pipes on the side wall of the housing of the online monitoring body, and extends the outlet end of the ventilation pipe into the housing and then reverses to form an outlet upward. This not only retains the heat dissipation channel for air convection, but also uses the principle of gravity to block the path of rainwater infiltration. Even if rainwater splashes into the inlet of the ventilation pipe, it will be blocked by gravity due to the upward extension structure inside the ventilation pipe, and will not be able to further enter the housing. This effectively avoids the defects of traditional through-type ventilation holes that are prone to rainwater splashing and backflow. It successfully achieves the dual functions of "ventilation and heat dissipation" and "rainproof and seepage prevention", effectively solving the contradiction between heat dissipation and rainproof requirements in existing monitoring devices.

[0016] Furthermore, by preventing rainwater infiltration, this invention effectively protects the milliammeter, action counter, and circuit signal processing components inside the casing from moisture and short circuits. This avoids problems such as milliammeter reading distortion, action counter false triggering, and signal processing component failure caused by rainwater intrusion in the prior art. It ensures that the monitoring device can always accurately collect the surge arrester leakage current, accurately record the number of actions, and stably transmit monitoring data, significantly improving the operational reliability of the device and the effectiveness of the monitoring data. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the housing of the present invention; Figure 3 for Figure 2 Enlarged view of A in the middle; Figure 4 This is a schematic diagram of the connection between the guide pipe and the ventilation pipe of the present invention; Figure 5 This is a partial cross-sectional view of the water distribution pipe and ventilation pipe of the present invention; Figure 6 This is a schematic diagram of the sealing cap of the present invention. Detailed Implementation

[0018] The present invention will now be described clearly and completely with reference to the accompanying drawings and embodiments: like Figures 1 to 6As shown, the surge arrester monitoring device of the present invention includes an online monitoring body connected to a three-phase surge arrester. Multiple ventilation pipes 2 are arranged on the side wall of the housing 1 of the online monitoring body. The ventilation pipes 2 are arranged in rows at intervals along the height direction of the housing 1. One end of the outlet of each ventilation pipe 2 extends into the interior of the housing 1. The end of the ventilation pipe 2 located inside the housing 1 extends upwards and forms an outlet at the top. By reversing the direction of the outlet upwards to form a structure perpendicular to the inlet, the ventilation and heat dissipation effect can be maintained while preventing rainwater from entering the interior of the housing 1, thus effectively avoiding the defects of traditional through-type ventilation holes that are prone to rainwater splashing and backflow. This reduces the probability of moisture damage to internal components, significantly extends the overall service life of the monitoring device, and reduces the replacement frequency and maintenance costs of surge arrester monitoring equipment in the power system. Simultaneously, it avoids the loss of control over the operation of the surge arrester due to monitoring device failure, further ensuring the safe and stable operation of power lines and substation equipment, and reducing safety hazards caused by the lack of lightning protection monitoring in the power system.

[0019] Furthermore, in this invention, the inlet end of the ventilation pipe 2 is preferably opened at an angle downwards, which can not only ensure the effect of ventilation and heat dissipation by utilizing the inclined surface, but also reduce the probability of rainwater entering the interior of the ventilation pipe 2 and avoid the accumulation and residue of rainwater inside.

[0020] Furthermore, a water collection pipe 3 is provided at the top of the shell 1. The bottom of the water collection pipe 3 is connected to the guide pipe 4 located inside the shell 1. The guide pipe 4 is connected to the corresponding ventilation pipe 2 through the water distribution pipe 5. When multiple rows of ventilation pipes 2 are set, the length of the water distribution pipe 5 can be extended to stagger the arrangement of the guide pipes 4 corresponding to different rows of ventilation pipes 2. The water collection pipe 3 corresponding to each guide pipe 4 can be appropriately increased or decreased according to the total number of guide pipes 4 set. The water collection pipe 3 is used to collect rainwater, which enters the ventilation pipe 2 to flush the inner wall of the ventilation pipe 2 and promptly flush out the dust accumulated inside, so as not to affect the ventilation and heat dissipation effect. The water distribution pipe 5 is located below the outlet of the ventilation pipe 2 and above the reversing section of the ventilation pipe 2, ensuring that water flows into the ventilation pipe 2 to flush the reversing section and avoid dust accumulation that could cause blockage of the ventilation pipe 2. At the same time, the water distribution pipe 5 being located below the outlet of the ventilation pipe 2 can also reduce the probability of water flowing upward into the interior of the shell 1.

[0021] Preferably, a sealing plate 6 is elastically hinged by a torsion spring at a position inside the vent pipe corresponding to the outlet of the water distribution pipe 5. When water flows from the water distribution pipe 5 into the vent pipe 2, the sealing plate 6 is pushed open, and its bottom end abuts against the inner wall of the vent pipe 2, forming a seal on the upper part of the outlet of the water distribution pipe 5. This further prevents water from flowing upwards back. The sealing plate 6 only needs a torsion spring with a very small torque, so that it can automatically reset when the water flow thrust is lost.

[0022] Furthermore, a water collection tank 7 is preferably provided on the top of the housing 1, and the top inlet of the water collection pipe 3 is located in the water collection tank 7; a sealing cover 8 is provided on the water collection tank 7, and the sealing cover 8 is driven by a driving component located inside the housing 1; a rain sensor 9 connected to the processor inside the online monitoring body is provided on the housing 1. The processor connected to the rain sensor 9 is the core control unit of the internal circuit and signal processing components of the online monitoring body, preferably an industrial-grade microprocessor (MCU), specifically an embedded processor with high anti-interference and low power consumption characteristics such as the STM32 series and PIC series, and this processor can be integrated into the motherboard of the aforementioned signal processing components without the need for an additional independent control module, ensuring structural compactness and functional integration. Its core function is to receive the real-time monitoring signal from the rain sensor 9, analyze and judge it through a preset logic algorithm, output precise control commands to drive the sealing cover 8 to move, and coordinate with the overall signal processing flow of the monitoring device (such as leakage current data acquisition, action counter signal integration, etc.) to achieve intelligent closed-loop control of "sensing-judgment-execution". Rain sensor 9 (preferably capacitive, optical, or tipping bucket type, suitable for harsh outdoor environments) monitors the environmental rainfall status in real time, converting rainfall intensity (e.g., no rain, light rain, heavy rain) into corresponding electrical signals (analog or digital signals), which are then transmitted to the processor via signal transmission lines (e.g., I2C, SPI bus, or analog signal lines). The rain sensor 9 senses the amount of rainfall and controls the opening and closing of the sealing cover 8 to allow rainwater to enter the collection pipe 3 and flush the ventilation pipe 2. Specifically, it can be set to briefly open the sealing cover 8 and then close it again when the rainfall is heavy, thus flushing the ventilation pipe 2. When the rainfall is light, the opening time of the sealing cover 8 can be extended.

[0023] The driving component includes a threaded screw 10 housed within the housing 1. The threaded screw 10 is driven by a motor, which is controlled by a processor. The motor's power supply can be obtained from the device's power system, but voltage matching is required for specific use. A slider is mounted on the threaded screw 10, and the slider is connected to a traction rod 12 slidably mounted on the top of the housing 1. A groove 11 is provided on the top of the housing 1 on one side of the water collection tank 7. The traction rod 12 slides within the groove 11, and a clearance groove is provided at the bottom of the groove 11 to allow the slider to connect with the traction rod 12 through the clearance groove. One end of the traction rod 12 located outside the housing 1 is connected to a sealing cover 8. During operation, the motor drives the threaded screw 10 to rotate, causing the slider to move. The slider pushes the traction rod 12 to slide out of the groove 11, and the sealing cover 8 slides out of the water collection tank 7 under the action of the traction rod 12. The slider and clearance groove are not shown in the figures in this invention.

[0024] In this invention, the sealing cover 8 has a U-shaped structure. The two ends of the water collection tank 7 can be sealed using baffles that protrude downwards at both ends. Furthermore, in this embodiment, a filter screen 13 is provided at the bottom of the water collection tank 7 to filter rainwater and prevent particulate matter generated by rainwater rinsing the top of the housing 1 from entering the water collection pipe 3 and clogging it. A cleaning brush 14 is provided at the bottom of the sealing cover 8, located at the rear end of the sealing cover 8, so that as the sealing cover 8 moves forward, the cleaning brush 14 can remove the impurities filtered on the filter screen 13.

[0025] This invention's rainproof and heat dissipation structure is achieved solely through the reversing design of the ventilation pipes 2, eliminating the need for additional complex components such as the sealing cover 8 and waterproof valves. The structure is simple, easy to manufacture, and cost-effective. Furthermore, the multiple ventilation pipes 2 ensure sufficient ventilation area, guaranteeing smooth air convection inside and outside the casing 1. This not only improves heat dissipation uniformity but also avoids heat dissipation failure caused by blockage of a single ventilation channel. It is suitable for harsh outdoor environments such as wind, rain, and snow, and exhibits strong long-term operational stability. By opening the sealing cover 8 during rainy weather, rainwater can flush the ventilation pipes, preventing dust accumulation inside and ensuring the unobstructed flow of the ventilation pipes 2, thus guaranteeing effective heat dissipation.

Claims

1. A surge arrester monitoring device comprising an on-line monitoring body connected to a three-phase surge arrester, characterized in that: The online monitoring body has multiple ventilation pipes on the side wall of its housing. One end of each ventilation pipe extends into the interior of the housing. The ventilation pipe located inside the housing extends upwards and forms an outlet at the top.

2. The surge arrester monitoring device according to claim 1, characterized in that: The inlet end of the ventilation duct is inclined downwards.

3. The surge arrester monitoring device according to claim 1 or 2, characterized in that: The top of the housing is provided with a water collection pipe, the bottom of which is connected to a guide pipe located inside the housing, and the guide pipe is connected to the corresponding ventilation pipe through a water distribution pipe.

4. The surge arrester monitoring device according to claim 3, characterized in that: The water distribution pipe is located below the outlet of the ventilation pipe.

5. The surge arrester monitoring device according to claim 4, characterized in that: The top of the housing is provided with a water collection tank, and the top inlet of the water collection pipe is located in the water collection tank; a sealing cover is provided on the water collection tank, and the sealing cover is driven by a driving component provided in the housing; a rain sensor connected to the processor in the online monitoring body is provided on the housing.

6. The surge arrester monitoring device according to claim 5, characterized in that: The driving component includes a threaded screw disposed within the housing, the threaded screw being driven by a motor controlled by the processor; a slider is disposed on the threaded screw, the slider being connected to a traction rod slidably disposed on the top of the housing, and one end of the traction rod located outside the housing being connected to the sealing cover.

7. The surge arrester monitoring device according to claim 6, characterized in that: A filter screen is installed at the bottom of the water collection tank.

8. The surge arrester monitoring device according to claim 7, characterized in that: A cleaning brush is provided at the bottom of the sealing cover.

9. The surge arrester monitoring device according to claim 8, characterized in that: The sealing cap has a U-shaped structure.

10. The surge arrester monitoring device according to claim 3, characterized in that: A sealing plate is elastically hinged inside the vent pipe at a position corresponding to the outlet of the water distribution pipe. When water flows from the water distribution pipe into the vent pipe, the sealing plate is pushed open, and its bottom end abuts against the inner wall of the vent pipe, forming a seal on the upper part of the outlet of the water distribution pipe.

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