Device for monitoring lightning arresting voltage

Abstract

The utility model discloses equipment for monitoring lightning arresting voltage, which belongs to the field of detection devices, and is characterized in that the equipment comprises a main control board, a lightning current peak value monitor, a three-pole grounding resistance detector, an NB wireless transmitter, an LCD display screen and a memory, the output end of the lightning current peak value monitor is connected with the input end of the main control board, and the output end of the LCD display screen is connected with the output end of the main control board; the output end of the tripolar grounding resistance detector is connected with the input end of the main control board, and the main control board is connected with the wireless transmitter, the LCD display screen and the memory. The lightning current peak value monitor comprises a lightning current transformer used for receiving lightning current, an induced voltage signal processing circuit used for receiving signals of the lightning current transformer, and an A / D conversion circuit used for receiving the signals of the induced voltage signal processing circuit and transmitting the processed signals to the main control board. According to the application, the functions of automatically detecting the grounding resistance by the three-pole method and recording the lightning current peak value are integrated, and meanwhile, the lightning voltage value is directly calculated.

Description

Technical Field

[0001] This application relates to the field of detection devices, and more specifically, to a device for monitoring lightning strike voltages. Background Art

[0002] Existing lightning protection devices can monitor the peak value of lightning current when directly struck by lightning. Through the monitoring of lightning current waveforms, most technologies are mechanical lightning strike counters, peak lightning current recorders, lightning current waveforms, and grounding resistance detection. However, there is no clear measurement device for lightning strike voltages.

[0003] By monitoring the peak value of lightning strike current and the voltage value of the grounding grid, and using Ohm's law, the lightning strike voltage value can be calculated. In view of this, the inventor has designed a device that integrates the functions of automatic detection of grounding resistance by the three-electrode method and recording of peak lightning current, and can directly calculate the lightning strike voltage device at the same time. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present utility model is to provide a device for monitoring lightning strike voltages, which has the advantages of integrating the functions of automatic detection of grounding resistance by the three-electrode method and recording of peak lightning current, and directly calculating the lightning voltage value at the same time.

[0005] To achieve the above purpose, the present utility model provides the following technical solution: A device for monitoring lightning strike voltages, including a main control board, a peak lightning current monitor, a three-electrode method grounding resistance detector, an NB wireless transmitter, an LCD display screen, and a memory. The output end of the peak lightning current monitor is connected to the input end of the main control board, and the output end of the three-electrode method grounding resistance detector is connected to the input end of the main control board. The main control board is connected to the wireless transmitter, the LCD display screen, and the memory. The peak lightning current monitor includes a lightning current transformer for receiving lightning current, an induced voltage signal processing circuit for receiving the signal of the lightning current transformer, and an A / D conversion circuit for receiving the induced voltage signal processing circuit and transmitting the processed signal to the main control board.

[0006] The present utility model is further provided as: The induced voltage signal processing circuit includes a main control chip, a GPS chip, an ADI-0514 component, a CurrentIn component, an EBI component, an NT component, and a button component. The main control chip is connected to the corresponding interfaces of the ADI-0514 component, the GPS chip, the EBI component, the NT component, and the button component. The ADI-0514 component is connected to the corresponding interface of the CurrentIn component. An NB module is connected to the EBI component.

[0007] The present utility model is further provided as: The main control chip is HC32L136J8TA.

[0008] The present utility model is further configured as follows: The NB module includes a plug-in connector, a diode, and a resistor. The No. 1 and No. 2 ports of the plug-in connector are connected to the voltage of the induced voltage signal processing circuit. The No. 3 and No. 4 ports of the plug-in connector are grounded. The No. 5 and No. 6 ports of the plug-in connector are connected to the corresponding interfaces of the EBI element. The No. 7, No. 8, No. 9, and No. 10 ports of the plug-in connector are respectively connected to the corresponding interfaces of the EBI element through resistors R1, R37, R24, and R42. And the diode is connected to the No. 7 port of the plug-in connector and is connected to resistor R2, and the other end of resistor R2 is grounded.

[0009] The present utility model is further configured as follows: The A / D conversion circuit includes an ADC chip, a plurality of resistors, and a plurality of capacitors. The ADC chip is connected to the corresponding resistors and capacitors.

[0010] The present utility model is further configured as follows: The three-electrode method grounding resistance detector includes an ARM microcontroller, a plurality of connectors, an analog-to-digital converter, a DRIVER element, a plurality of resistors, a plurality of capacitors, a fuse, and a diode. The ARM microcontroller is correspondingly connected to the analog-to-digital converter, a plurality of connectors, the DRIVER element, a plurality of resistors, a plurality of capacitors, the fuse, and the diode.

[0011] The present utility model is further configured as follows: The ARM microcontroller is GD32F303CC, and the analog-to-digital converter is ADS131M04.

[0012] In summary, the present utility model has the following advantages:

[0013] It integrates the functions of automatic detection of grounding resistance by the three-electrode method and recording of the peak value of lightning current. The peak value of lightning current is monitored by the lightning current peak monitor to record the value I, and the grounding resistance value R is monitored by the three-electrode method grounding resistance detector. Through the detected grounding resistance value R, the peak value record value I of lightning current, the grounding shunt coefficient F, and the environmental coefficient S, the lightning voltage V received by the lightning arrester can be calculated. The calculation formula is V = R * I * F * S. For the shunt coefficient F, when there is only one grounding downlead for independent lightning protection, it is taken as 1; when there are multiple shunts for the grounding downleads and the lightning current has been shunted, the shunt coefficient F corresponds to the value of the grounding downlead. For the environmental coefficient S, according to the distance between the lightning strike point and the equipment and the distribution of the grounding grid, it is recommended that the value be greater than or equal to 1.

[0014] When the above-mentioned multiple devices are installed on the same lightning arrester, according to the actual installation position, a data model is established in advance, and the lightning voltage value received by the lightning arrester is calculated by the main control board. Description of the Drawings

[0015] Figure 1 It is a module connection diagram of the device for measuring the lightning voltage received by the lightning arrester in this embodiment;

[0016] Figure 2is the circuit diagram of the main control board in this embodiment;

[0017] Figure 3 is the circuit diagram of the induced voltage signal processing circuit in this embodiment;

[0018] Figure 4 is the circuit diagram of the A / D conversion circuit in this embodiment;

[0019] Figure 5 is the circuit diagram of the three-electrode method grounding resistance detection in this embodiment. Detailed implementation mode

[0020] The following further elaborates on the present utility model in conjunction with the attached drawings.

[0021] Please refer to Figures 1-5 , this embodiment provides a lightning strike voltage monitoring device, including a main control board, a lightning current peak monitor, a three-electrode method grounding resistance detector, an NB wireless transmitter, an LCD display screen, and a memory. The output end of the lightning current peak monitor is connected to the input end of the main control board, the output end of the three-electrode method grounding resistance detector is connected to the input end of the main control board, the main control board is connected to the wireless transmitter, the LCD display screen, and the memory. The lightning current peak monitor includes a lightning current transformer for receiving lightning current, an induced voltage signal processing circuit for receiving the signal of the lightning current transformer, and an A / D conversion circuit for receiving the induced voltage signal processing circuit and transmitting the processed signal to the main control board.

[0022] Furthermore, the induced voltage signal processing circuit includes a main control chip HC32L136J8TA, a GPS chip, an ADI-0514 component, a CurrentIn component, an EBI component, an NT component, and a button component. The main control chip is connected to the corresponding interfaces of the ADI-0514 component, the GPS chip, the EBI component, the NT component, and the button component. The ADI-0514 component is connected to the corresponding interface of the CurrentIn component, and an NB module is connected to the EBI component.

[0023] Furthermore, the NB module includes a plug-in connector, a diode, and a resistor. The 1st and 2nd ports of the plug-in connector are connected to the voltage of the induced voltage signal processing circuit, the 3rd and 4th ports of the plug-in connector are grounded, the 5th and 6th ports of the plug-in connector are connected to the corresponding interfaces of the EBI component, the 7th, 8th, 9th, and 10th ports of the plug-in connector are respectively connected to the corresponding interfaces of the EBI component through resistors R1, R37, R24, and R42, and the diode is connected to the 7th port of the plug-in connector and connected to resistor R2, and the other end of resistor R2 is grounded.

[0024] Furthermore, the A / D conversion circuit includes an ADC chip, several resistors, and several capacitors. The ADC chip is connected to the corresponding resistors and capacitors.

[0025] Further, the three - electrode method grounding resistance detector includes an ARM microcontroller, several connectors, an analog - to - digital converter, a DRIVER component, several resistors, several capacitors, a fuse, and a diode. The ARM microcontroller is correspondingly connected to the analog - to - digital converter, several connectors, the DRIVER component, several resistors, several capacitors, the fuse, and the diode.

[0026] In this embodiment, the ARM microcontroller is GD32F303CC, and the analog - to - digital converter is ADS131M04.

[0027] When the lightning current passes through the measurement channel of the lightning current transformer, it will instantaneously wake up the main control board (CPU). At the same time, the induction signal is quickly A / D - converted by the signal processing circuit for calculating the peak value of the lightning current. After the conversion and processing, the main control board (CPU) reads the peak value data. The main control board (CPU) calculates the lightning current value according to the A / D conversion result, can accurately record and store the magnitude, time, and polarity of the lightning current, and at the same time uploads the data to the cloud server through the wireless communication circuit.

[0028] The three - electrode method for measuring the grounding resistance value uses the rated - current variable - pole method, that is, an alternating - current rated current I flows between the measurement object E (grounding electrode) and C (current electrode), the potential difference V between E and P (voltage electrode) is obtained, and then the grounding resistance R is obtained by the method of R = V / I.

[0029] Based on the detected grounding resistance value R, the recorded value I of the lightning - current peak, the grounding - shunt coefficient F, and the environmental coefficient S, the lightning - strike voltage V can be calculated. The calculation formula is V = R * I * F * S. For the shunt coefficient F, when there is only one grounding down - conductor for independent lightning - strike, F takes 1; when there are multiple grounding down - conductors for lightning - current shunting, the shunt coefficient F corresponds to the value of the grounding down - conductor. For the environmental coefficient S, according to the distance between the lightning - strike point and the equipment and the distribution of the grounding grid, it is recommended that the value be greater than or equal to 1.

[0030] When multiple devices are installed on the same lightning - receiving device, a data model needs to be established according to the actual installation position to calculate the reference lightning - strike voltage value.

[0031] As can be seen from the above, the utility model integrates the functions of automatic detection of the grounding resistance by the three - electrode method and recording of the peak value of lightning current. The peak value of lightning current is monitored by the lightning current peak monitor to record the value I, and the grounding resistance value R is monitored by the three - electrode method grounding resistance detector. When the lightning current passes through the measurement channel of the lightning current transformer, it will instantaneously wake up the main control chip (CPU) for recording the peak value of lightning current and the on - line measurement ARM microcontroller (CPU) of the grounding resistance. At the same time, the peak lightning current I and the grounding resistance value R are recorded. According to the calculation formula V = R * I * F * S (the environmental coefficient S takes the value of 1), the lightning voltage value is directly calculated by combining the number of grounding shunt points. The magnitude, time of the lightning current and the grounding resistance value are accurately measured, recorded and stored, and the recorded value of lightning current, the grounding resistance value and the calculated lightning voltage value are uploaded to the cloud server through the wireless communication circuit at the same time.

[0032] The working process and beneficial effects of the utility model are as follows:

[0033] (1) Integrate the functions of automatic detection of the grounding resistance by the three - electrode method and recording of the peak value of lightning current, and directly calculate the lightning voltage value at the same time;

[0034] (2) Only connect to the ground grid during device measurement, and the device is disconnected from the ground grid during non - measurement, reducing the damage of lightning to the device;

[0035] (3) Use a high - frequency flexible Rogowski coil as the lightning current transformer, which has no magnetic saturation, good linearity, a high dynamic measurement range and strong over - current capacity;

[0036] (4) Can measure the interference voltage of the grounding grid at the same time;

[0037] (5) Powered by a high - performance battery, which is convenient for installation and maintenance;

[0038] (6) Automatically detect the grounding resistance regularly and wake up when there is a lightning strike record, and the standby current in sleep mode is less than 100uA;

[0039] (7) Through the detected grounding resistance value R, the recorded value I of the peak lightning current, the grounding shunt coefficient F, and the environmental coefficient S. The lightning voltage V of the lightning strike can be calculated, and the calculation formula is V = R * I * F * S. For the shunt coefficient F, when there is only 1 grounding down - conductor for independent lightning strike, take 1; when there are multiple shunts for the grounding down - conductor and the lightning current has been shunted, the shunt coefficient F corresponds to the value of the grounding down - conductor.

[0040] The above are only the preferred embodiments of the utility model, and are not used to limit the utility model. Any modifications, equivalent replacements, improvements, etc. made within the design concept of the utility model shall be included within the protection scope of the utility model.

Claims

1. A lightning voltage monitoring device, characterized in that: The invention comprises a main control board, a lightning current peak value monitor, a three-pole grounding resistance detector, an NB wireless transmitter, an LCD display screen and a memory. The output end of the lightning current peak value monitor is connected to the input end of the main control board, the output end of the three-pole grounding resistance detector is connected to the input end of the main control board, the main control board is connected to the wireless transmitter, the LCD display screen and the memory. The lightning current peak value monitor comprises a lightning current transformer for receiving lightning current, an induced voltage signal processing circuit for receiving a lightning current transformer signal and an A / D conversion circuit for receiving the induced voltage signal processing circuit and transmitting the processed signal to the main control board.

2. The lightning voltage monitoring device according to claim 1 is characterized in that: The induced voltage signal processing circuit includes a main control chip, a GPS chip, an ADI-0514 component, a CurrentIn component, an EBI component, an NT component, and a button component. The main control chip is connected to corresponding interfaces of the ADI-0514 component, the GPS chip, the EBI component, the NT component, and the button component. The ADI-0514 component is connected to the corresponding interface of the CurrentIn component, and the EBI component is connected to a NB module.

3. The lightning voltage monitoring device according to claim 2 is characterized in that: The main control chip is HC32L136J8TA.

4. The device for monitoring lightning voltage according to claim 2, characterized in that: The NB module includes a connector, a diode, and a resistor. Ports 1 and 2 of the connector are connected to the voltage of the induced voltage signal processing circuit, ports 3 and 4 of the connector are grounded, ports 5 and 6 of the connector are connected to the corresponding interfaces of the EBI component, ports 7, 8, 9, and 10 of the connector are connected to the corresponding interfaces of the EBI component through resistors R1, R37, R24, and R42, respectively, and the diode is connected to port 7 of the connector and to resistor R2, and the other end of the resistor R2 is grounded.

5. The lightning voltage monitoring device according to claim 2 is characterized in that: The A / D conversion circuit includes an ADC chip, a plurality of resistors, and a plurality of capacitors, and the ADC chip is connected to corresponding resistors and capacitors.

6. The lightning voltage monitoring device according to claim 1 is characterized in that: The three-pole ground resistance detector includes an ARM microcontroller, a plurality of connectors, an analog-to-digital converter, a DRIVER element, a plurality of resistors, a plurality of capacitors, a fuse, and a diode. The ARM microcontroller is correspondingly connected to the analog-to-digital converter, the plurality of connectors, the DRIVER element, a plurality of resistors, a plurality of capacitors, a fuse, and a diode.

7. The device for monitoring lightning voltage according to claim 6, characterized in that: The ARM microcontroller is GD32F303CC, and the analog-to-digital converter is ADS131M04.

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