Lightning down conductor side flashover / contact voltage early warning device

Abstract

The utility model discloses a lightning down lead side flashover / contact voltage early warning device, install the electric signal sensor of monitoring down lead electric signal on down lead, the output of electric signal sensor connects signal processing module, the output of signal processing module connects alarm, and signal processing module drives alarm work according to the electric signal of electric signal sensor monitoring. The utility model discloses through electric signal sensor (such as voltage sensor) real -time monitoring down lead voltage, triggers audible -visual alarm when monitoring dangerous voltage, and warns pedestrians to keep away from dangerous area. The device has fast response, multiple protection and low power consumption characteristics, and can significantly improve the personnel safety protection level under thunder and lightning weather.

Description

Technical Field

[0001] This utility model relates to a lightning down conductor side flashover / contact voltage early warning device, which is used to monitor the leakage voltage of the lightning down conductor and warn pedestrians to stay away from the danger zone. It can effectively prevent pedestrians from being injured by side flashover / contact voltage caused by contact potential when lightning current flows through the down conductor. It belongs to the field of lightning protection technology. Background Technology

[0002] In building lightning protection systems, down conductors are crucial components for guiding lightning current to the ground. However, when lightning current passes through a down conductor, a transient high-voltage field is created around it. If a pedestrian approaches, this could trigger a side flashover / contact voltage, leading to an electric shock. Current technology typically relies solely on insulating coatings or insulating strips for physical protection of down conductors, lacking real-time monitoring and dynamic warning mechanisms for lightning current, making it difficult to promptly prevent pedestrians from approaching high-risk areas.

[0003] The existing technology has the following main defects: 1. Traditional down conductor protection relies on static isolation and cannot dynamically respond to the risk of lightning strikes or leakage; 2. It lacks a rapid detection and early warning mechanism for instantaneous high voltage, and pedestrians are passively exposed to danger. Utility Model Content

[0004] To address the aforementioned shortcomings of existing technologies, the purpose of this invention is to propose a lightning down conductor side flashover / contact voltage early warning device. This invention monitors down conductor voltage changes in real time and triggers an audible and visual alarm when a dangerous electrical signal occurs, thus actively driving pedestrians away.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A lightning down conductor side flashover / touch voltage early warning device includes an electrical signal sensor installed on the down conductor to monitor the electrical signal of the down conductor. The output of the electrical signal sensor is connected to a signal processing module, and the output of the signal processing module is connected to an alarm. The signal processing module drives the alarm to work based on the electrical signal monitored by the electrical signal sensor.

[0007] Preferably, the electrical signal sensor is a voltage sensor used to monitor the voltage of the down conductor to ground.

[0008] Furthermore, the voltage sensor includes an AC voltage sensor and a lightning transient voltage sensor connected in parallel, and the AC voltage sensor and the lightning transient voltage sensor are connected to the signal processing module through an electromagnetic shielded cable.

[0009] Furthermore, the alarm includes an audible alarm and a visual alarm. The audible alarm and the signal processing module are installed inside the housing; the visual alarm is installed outside the housing and located on the top of the housing; a sound outlet is provided on the housing directly opposite the audible alarm; the housing is fixedly installed on the down conductor or on the exterior wall of the building where the down conductor is located, close to the down conductor, by means of an insulating bracket.

[0010] Preferably, the height of the box above the ground is 1.5-2.7m.

[0011] Furthermore, the box also contains a power module, which is connected to the alarm, signal processing module and electrical signal sensor to provide power.

[0012] Furthermore, an antenna unit is provided outside the box, which is electrically connected to the signal processing module and is used to wirelessly transmit the working data of the signal processing module to the receiving end that needs it.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This utility model uses a voltage sensor to monitor the voltage of the down conductor to ground in real time. When a dangerous voltage (AC ≥ 50V or transient ≥ 1000V) is detected, an audible and visual alarm is triggered to warn pedestrians to stay away from the danger zone. This device features rapid response, multiple protections, and low power consumption, which can significantly improve the level of personnel safety protection during thunderstorms.

[0015] Of course, this invention can also collect current signals, and trigger an audible and visual alarm when the current is greater than a set value (in this embodiment, the set values ​​for AC and lightning are both uniformly 50 mA) to warn pedestrians to stay away from the danger zone.

[0016] 2. This utility model transmits the working information of the early warning device to the receiving end that needs it through an antenna. Relevant personnel can analyze the data to better issue early warnings and understand the source and characteristics of dangers. Attached Figure Description

[0017] Figure 1 This is a circuit block diagram of an embodiment of the present utility model.

[0018] Figure 2 This is a schematic diagram of the overall external structure of this utility model.

[0019] Figure 3 This is a circuit diagram of the threshold comparison circuit in the embodiment.

[0020] Among them, 1-box body; 2-light alarm; 3-sound outlet; 4-antenna unit; 5-electronic display screen; 6-AC voltage sensor; 7-lightning transient voltage sensor; 8-electromagnetic shielded cable; 9-signal processing module; 10-power supply module. Detailed Implementation

[0021] The implementation method and principle of this utility model will be further described in detail below with reference to the accompanying drawings.

[0022] See Figure 1 and Figure 2 As can be seen from the figure, this utility model discloses a lightning down conductor side flashover / contact voltage early warning device. An electrical signal sensor is installed on the down conductor to monitor the electrical signal of the down conductor. The output of the electrical signal sensor is connected to a signal processing module, and the output of the signal processing module is connected to an alarm. The signal processing module drives the alarm to work according to the electrical signal monitored by the electrical signal sensor.

[0023] The electrical signal sensor can be a voltage sensor to monitor the voltage of the down conductor to ground, or a current sensor to monitor the current flowing through the down conductor.

[0024] When the electrical signal sensor is a voltage sensor, this utility model includes an AC voltage sensor 6 (range 0-100V, accuracy ±1%) and a lightning transient voltage sensor 7 (range 0-2000V, response time ≤1μs), which are installed in parallel outside the down conductor to monitor the voltage of the down conductor to ground. The two voltage sensors are connected to the signal processing module 9 through an electromagnetic shielded cable 8.

[0025] The signal processing module incorporates a threshold comparison circuit and a microcontroller (MCU). When the electrical signal sensor is a dual-voltage sensor, two trigger thresholds are set. The first threshold is AC voltage ≥ 50V (for equipment leakage or power frequency interference); the second threshold is transient voltage ≥ 1000V (for lightning strikes). The output of the electrical signal sensor is connected to the threshold comparison circuit, which in turn is connected to the microcontroller. The microcontroller controls whether the alarm is activated based on the output of the threshold comparison circuit.

[0026] The alarm of this invention includes an audible alarm and a visual alarm, used to receive the output signal of the signal processing module and trigger the audible and visual alarm; it supports both intermittent and continuous alarm modes.

[0027] Light alarm: It adopts a high-brightness red LED array (flickering frequency 2Hz) and a flashing warning light.

[0028] Audible alarm: Integrated high-decibel buzzer (volume ≥ 90dB, frequency adjustable from 1kHz to 3kHz). It can also simultaneously play pre-recorded warning sounds (e.g., "Danger, please stay away").

[0029] See Figure 2In this embodiment, to accommodate the various components and improve the overall integrity of the product, the present invention also includes a housing 1, inside which the audible alarm and signal processing module 9 are installed; a visual alarm 2 is installed outside the housing 1 and located on the top of the housing 1; and a sound outlet 3 is provided on the housing directly opposite the audible alarm. The housing is fixedly installed on the down conductor or on the wall of the building where the down conductor is located, close to the down conductor, by means of an insulating bracket.

[0030] If the housing is fixedly installed on the down conductor using an insulating bracket, the electrical signal sensor can be enclosed within the housing. This prevents the sensors from being exposed, improves overall integrity, and also provides protection for the sensors.

[0031] This invention also includes a power module 10 inside the housing 1. The power module is connected to the alarm, signal processing module, and electrical signal sensor to supply power to them. The power module has a built-in lithium battery to AC / DC conversion circuit, supporting dual power supply from AC / DC (220V AC) and the lithium battery, providing redundant power to all components. The power module also has a built-in overvoltage protection circuit to ensure continuous operation even under lightning strike conditions.

[0032] To facilitate relevant personnel's understanding of the device's operation, especially the electrical signal status during alarms, this invention includes an antenna unit 4 outside the casing. This antenna unit is connected to the signal processing module and wirelessly transmits the module's operational data to the appropriate receiving end. Relevant personnel can then analyze this data to better provide early warnings and understand the source and characteristics of hazards.

[0033] Furthermore, an electronic display screen 5 is provided on the surface of the box to display the real-time value of the electrical signal collected by the electrical signal sensor and other information that needs to be displayed.

[0034] This utility model is installed at a height of 1.5-2.7m above the ground (a height that is easily accessible and noticeable to pedestrians), with the alarm facing the pedestrian walkway. The insulating bracket can be equipped with adjusting bolts to accommodate down conductors of different diameters.

[0035] Working principle

[0036] When a dangerous voltage is generated in the down conductor due to lightning strike or equipment leakage, the voltage sensor transmits the signal to the signal processing module; then the MCU determines whether the voltage exceeds the set threshold. If the first threshold (50V AC) is reached, an intermittent audible and visual alarm is triggered (LED flashing + intermittent buzzer sounding); if the second threshold (1000V transient) is reached, a continuous bright light alarm and high-frequency buzzer (higher priority) are triggered; the alarm signal continues until the voltage drops to a safe range and then automatically resets.

[0037] Example:

[0038] Hardware selection:

[0039] The lightning transient voltage sensor uses a Rogowski coil type high voltage probe (model HVT-1000) with a response time of 0.5μs; the AC voltage sensor is model LD-100.

[0040] The MCU uses the STM32F103 series and has a built-in ADC module to digitize voltage signals.

[0041] Figure 3 This is a circuit diagram of the threshold comparison circuit in the embodiment.

[0042] The alarm housing has an IP65 protection rating, making it suitable for harsh outdoor environments.

[0043] Installation test:

[0044] In the simulated lightning strike test (8 / 20μs impulse current 10kA), the device activated the alarm within 0.2s after detecting a 1000V transient voltage;

[0045] Routine leakage current test (60V AC), alarm delay ≤0.5s.

[0046] Finally, it should be noted that the above examples of this utility model are merely illustrative and not intended to limit the implementation of this utility model. Although the applicant has described this utility model in detail with reference to preferred embodiments, those skilled in the art can make other variations and modifications based on the above description. It is impossible to exhaustively list all possible implementations here. All obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A lightning down conductor side flashover / contact voltage early warning device, characterized in that: An electrical signal sensor is installed on the down conductor to monitor the electrical signal of the down conductor. The output of the electrical signal sensor is connected to a signal processing module, and the output of the signal processing module is connected to an alarm. The signal processing module drives the alarm to work based on the electrical signal monitored by the electrical signal sensor. The electrical signal sensor is a voltage sensor used to monitor the voltage of the down conductor to ground, or the electrical signal sensor is a current sensor used to monitor the current flowing through the down conductor; The voltage sensor includes an AC voltage sensor and a lightning transient voltage sensor connected in parallel. The AC voltage sensor and the lightning transient voltage sensor are connected to the signal processing module through an electromagnetic shielded cable.

2. The lightning down conductor side flashover / contact voltage early warning device according to claim 1, characterized in that: The alarm system includes an audible alarm and a visual alarm. The audible alarm and signal processing module are installed inside the housing. The visual alarm is installed outside the housing and located on the top of the housing. A sound outlet is provided on the housing directly opposite the audible alarm. The housing is fixedly installed on the down conductor or on the exterior wall of the building where the down conductor is located, close to the down conductor, by means of an insulating bracket.

3. The lightning down conductor side flashover / contact voltage early warning device according to claim 2, characterized in that: The height of the box above the ground is 1.5-2.7m.

4. The lightning down conductor side flashover / contact voltage early warning device according to claim 2, characterized in that: The box also contains a power module, which is connected to the alarm, signal processing module and electrical signal sensor to provide power.

5. A lightning down conductor side flashover / contact voltage early warning device according to claim 2, characterized in that: The box is equipped with an antenna unit, which is electrically connected to the signal processing module and is used to wirelessly transmit the working data of the signal processing module to the receiving end that needs it.

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