CN210894507U - Impact grounding resistance measuring device based on lightning current monitoring - Google Patents
Impact grounding resistance measuring device based on lightning current monitoring Download PDFInfo
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- CN210894507U CN210894507U CN201921785750.9U CN201921785750U CN210894507U CN 210894507 U CN210894507 U CN 210894507U CN 201921785750 U CN201921785750 U CN 201921785750U CN 210894507 U CN210894507 U CN 210894507U
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Abstract
The utility model discloses a can realize on-line measuring and can provide real data support for the analysis of ground resistance under the real nature thunder and lightning strikes's impact ground resistance measuring device based on lightning current monitoring. The device comprises a first sensor CH1, a second sensor CH2, a third sensor CH3, a fourth sensor CH4, a first integrator, a second integrator, a third integrator, a fourth integrator, a logic OR gate, a voltage divider, a first peak holding circuit, a second peak holding circuit, a third peak holding circuit, a fourth peak holding circuit, a fifth peak holding circuit, a trigger circuit Trig, a display module, an input module, a wireless communication module, a storage module, a first ADC chip, a second ADC chip, an MCU chip and a power supply unit, wherein the first sensor CH1 is connected with the first integrator; the device realizes lightning stroke remote fault location, and solves the problem of difficult measurement and implementation of personnel; the influence of the grounding resistance on the lightning current discharge capacity can be truly reflected. Is suitable for popularization and application in the field of on-line monitoring.
Description
Technical Field
The utility model relates to an on-line monitoring field, concretely relates to impact ground resistance measuring device based on lightning current monitoring.
Background
The existing measurement of the grounding resistance mostly measures the power frequency grounding resistance, but the impact grounding resistance is the key factor which really influences the lightning strike counterattack probability. Under the influence of the characteristics of the current dispersion behavior of the impact current in the ground, the impact grounding resistance and the power frequency grounding resistance have larger difference, so that the power frequency grounding resistance value of the transmission tower is qualified in the actual engineering, and the effective function of the transmission tower cannot be exerted when the transmission line is struck by lightning, so that the circuit is tripped.
The existing impulse grounding resistance measurement needs to transport an impulse current generator with a huge volume to the site, and the measurement is extremely difficult. Therefore, the method for measuring impulse grounding resistance is rarely adopted to judge the grounding condition actually, and the current leakage capacity of the grounding network to real lightning cannot be reflected really.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an impulse grounding resistance measuring device based on lightning current monitoring that can realize impulse grounding resistance's on-line measurement and can provide real data support for the analysis of ground resistance under the real nature thunder and lightning impulse is provided.
The utility model provides a technical scheme that above-mentioned technical problem adopted is: the impulse grounding resistance measuring device based on lightning current monitoring comprises a first lightning current sensor CH1, a second lightning current sensor CH2, a third lightning current sensor CH3, a fourth lightning current sensor CH4, a first integrator, a second integrator, a third integrator, a fourth integrator, a logic OR gate OR, a voltage divider, a first peak holding circuit, a second peak holding circuit, a third peak holding circuit, a fourth peak holding circuit, a fifth peak holding circuit, a trigger circuit Trig, a display module, an input module, a wireless communication module, a storage module, a first ADC chip, a second ADC chip, an MCU chip and a power supply unit;
the first lightning current sensor CH1, the second lightning current sensor CH2, the third lightning current sensor CH3 and the fourth lightning current sensor CH4 are respectively used for acquiring lightning current signals passing through a grounding body, and the voltage divider is used for acquiring an overvoltage value from the grounding body to the ground outside the grounding grid;
the output end of the first lightning current sensor CH1, the output end of the second lightning current sensor CH2, the output end of the third lightning current sensor CH3 and the output end of the fourth lightning current sensor CH4 are respectively connected with the input end of the first integrator, the input end of the second integrator, the input end of the third integrator and the input end of the fourth integrator;
the output end of the first integrator, the output end of the second integrator, the output end of the third integrator and the output end of the fourth integrator are respectively connected with the input end of the first peak holding circuit, the input end of the second peak holding circuit, the input end of the third peak holding circuit and the input end of the fourth peak holding circuit, and the output end of the voltage divider is connected with the input end of the fifth peak holding circuit;
the input end of the logic OR gate OR is respectively connected with the output end of the first lightning current sensor CH1, the output end of the second lightning current sensor CH2, the output end of the third lightning current sensor CH3 and the output end of the fourth lightning current sensor CH4, and the output end of the logic OR gate OR is connected with the input end of the trigger circuit Trig;
the output end of the trigger circuit Trig, the output end of the first peak holding circuit, the output end of the second peak holding circuit, the output end of the third peak holding circuit and the output end of the fourth peak holding circuit are respectively connected with the first ADC chip; the output end of the fifth peak holding circuit and the output end of the trigger circuit Trig are respectively connected with the second ADC chip;
the display module, the input module, the wireless communication module, the storage module, the first ADC chip and the second ADC chip are respectively connected with the MCU chip, and the power supply unit is respectively connected with the first lightning current sensor CH1, the second lightning current sensor CH2, the third lightning current sensor CH3, the fourth lightning current sensor CH4, the first integrator, the second integrator, the third integrator, the fourth integrator, the logical OR gate OR, the voltage divider, the first peak value holding circuit, the second peak value holding circuit, the third peak value holding circuit, the fourth peak value holding circuit, the fifth peak value holding circuit, the trigger circuit Trig, the display module, the input module, the wireless communication module, the storage module, the first ADC chip, the second ADC chip and the MCU chip in a power supply mode.
Furthermore, the first lightning current sensor CH1, the second lightning current sensor CH2, the third lightning current sensor CH3 and the fourth lightning current sensor CH4 are all H-FCT-350 Rogowski coil current sensors.
Further, the display module is an OLED display screen.
Further, the input module is a key.
Further, the wireless communication module is a GPRS module.
Further, the storage module is a W25Q256FLASH memory.
Further, the MCU chip is an STM32F103 chip.
Further, the first ADC chip and the second ADC chip are both ADC3422 chips.
Further, the power supply unit comprises a storage battery and a solar panel, and the storage battery is connected with the solar panel through a charging controller.
Further, the voltage divider adopts a PVM-100 high-frequency voltage divider.
The utility model has the advantages that: when the impulse grounding resistance measuring device based on lightning current monitoring is used, when the first lightning current sensor CH1 senses a lightning current pulse signal passing through a grounding body and transmits the lightning current pulse signal to a first integrator and a logic OR gate OR respectively, when the second lightning current sensor CH2 senses a lightning current pulse signal passing through the grounding body and transmits the lightning current pulse signal to a second integrator and a logic OR gate OR respectively, when the third lightning current sensor CH3 senses a lightning current pulse signal passing through the grounding body and transmits the lightning current pulse signal to a third integrator and a logic OR gate OR respectively, when the fourth lightning current sensor CH4 senses a lightning current pulse signal passing through the grounding body and transmits the lightning current pulse signal to a fourth integrator and a logic OR gate OR, when any one of the first lightning current sensor CH1, the second lightning current sensor CH2, the third lightning current sensor CH3 and the fourth lightning current sensor CH4 captures a lightning current signal passing through the grounding body, the logic OR gate OR outputs 1, and the trigger circuit Trig triggers the first ADC chip and the second ADC chip to sample; the first integrator, the second integrator, the third integrator and the fourth integrator respectively restore the collected lightning current pulse signals passing through the grounding body into real lightning current signals and convert the real lightning current signals into measurable range values, then the real lightning current signals are respectively transmitted to the first peak holding circuit, the second peak holding circuit, the third peak holding circuit and the fourth peak holding circuit to hold the measured lightning current peak values for a long time, so that the first ADC chip collects the lightning current amplitude values, the voltage divider collects the overvoltage pulse signals from the grounding body to the earth outside the earth grid when sensing the overvoltage pulse signals and reduces the overvoltage pulse signals into real overvoltage signals and converts the overvoltage signals into the measurable range values, then the real overvoltage peak values are transmitted to the fifth peak holding circuit to hold the measured overvoltage peak values for a long time, so that the second ADC chip collects the overvoltage amplitude values, and the first ADC chip and the second ADC chip transmit the collected lightning current amplitude values and the collected overvoltage amplitude value data to the MCU chip, the impact grounding resistance of four grounding bodies and the impact grounding resistance value of the whole ground network are calculated by the MCU chip by utilizing the lightning current amplitude and the overvoltage amplitude, data are stored in the storage module and then are sent to a remote server through the wireless communication module, the display module and the input module are designed for man-machine interaction, monitored data can be checked at a monitoring terminal, and communication parameters, time and equipment information are set; the lightning current amplitude monitoring and the lightning overvoltage monitoring are integrated to measure the impulse grounding resistance, so that the influence of the grounding resistance on the lightning current discharge capacity can be truly reflected; providing data support for lightning stroke fault positioning and lightning stroke overvoltage analysis; data analysis is provided for ground truing.
Drawings
Fig. 1 is a schematic diagram of a frame structure of an impulse grounding resistance measuring device based on lightning current monitoring according to the present invention;
fig. 2 is a block diagram of the power supply unit according to the present invention.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1 and 2, the impulse grounding resistance measuring device based on lightning current monitoring includes a first lightning current sensor CH1, a second lightning current sensor CH2, a third lightning current sensor CH3, a fourth lightning current sensor CH4, a first integrator, a second integrator, a third integrator, a fourth integrator, an OR gate, a voltage divider, a first peak holding circuit, a second peak holding circuit, a third peak holding circuit, a fourth peak holding circuit, a fifth peak holding circuit, a trigger circuit Trig, a display module, an input module, a wireless communication module, a storage module, a first ADC chip, a second ADC chip, an MCU chip, and a power supply unit;
the first lightning current sensor CH1, the second lightning current sensor CH2, the third lightning current sensor CH3 and the fourth lightning current sensor CH4 are respectively used for acquiring lightning current signals passing through a grounding body, and the voltage divider is used for acquiring an overvoltage value from the grounding body to the ground outside the grounding grid;
the output end of the first lightning current sensor CH1, the output end of the second lightning current sensor CH2, the output end of the third lightning current sensor CH3 and the output end of the fourth lightning current sensor CH4 are respectively connected with the input end of the first integrator, the input end of the second integrator, the input end of the third integrator and the input end of the fourth integrator;
the output end of the first integrator, the output end of the second integrator, the output end of the third integrator and the output end of the fourth integrator are respectively connected with the input end of the first peak holding circuit, the input end of the second peak holding circuit, the input end of the third peak holding circuit and the input end of the fourth peak holding circuit, and the output end of the voltage divider is connected with the input end of the fifth peak holding circuit;
the input end of the logic OR gate OR is respectively connected with the output end of the first lightning current sensor CH1, the output end of the second lightning current sensor CH2, the output end of the third lightning current sensor CH3 and the output end of the fourth lightning current sensor CH4, and the output end of the logic OR gate OR is connected with the input end of the trigger circuit Trig;
the output end of the trigger circuit Trig, the output end of the first peak holding circuit, the output end of the second peak holding circuit, the output end of the third peak holding circuit and the output end of the fourth peak holding circuit are respectively connected with the first ADC chip; the output end of the fifth peak holding circuit and the output end of the trigger circuit Trig are respectively connected with the second ADC chip;
the display module, the input module, the wireless communication module, the storage module, the first ADC chip and the second ADC chip are respectively connected with the MCU chip, and the power supply unit is respectively connected with the first lightning current sensor CH1, the second lightning current sensor CH2, the third lightning current sensor CH3, the fourth lightning current sensor CH4, the first integrator, the second integrator, the third integrator, the fourth integrator, the logical OR gate OR, the voltage divider, the first peak value holding circuit, the second peak value holding circuit, the third peak value holding circuit, the fourth peak value holding circuit, the fifth peak value holding circuit, the trigger circuit Trig, the display module, the input module, the wireless communication module, the storage module, the first ADC chip, the second ADC chip and the MCU chip in a power supply mode.
When the impulse grounding resistance measuring device based on lightning current monitoring is used, when the first lightning current sensor CH1 senses a lightning current pulse signal passing through a grounding body and transmits the lightning current pulse signal to a first integrator and a logic OR gate OR respectively, when the second lightning current sensor CH2 senses a lightning current pulse signal passing through the grounding body and transmits the lightning current pulse signal to a second integrator and a logic OR gate OR respectively, when the third lightning current sensor CH3 senses a lightning current pulse signal passing through the grounding body and transmits the lightning current pulse signal to a third integrator and a logic OR gate OR respectively, when the fourth lightning current sensor CH4 senses a lightning current pulse signal passing through the grounding body and transmits the lightning current pulse signal to a fourth integrator and a logic OR gate OR, when any one of the first lightning current sensor CH1, the second lightning current sensor CH2, the third lightning current sensor CH3 and the fourth lightning current sensor CH4 captures a lightning current signal passing through the grounding body, the logic OR gate OR outputs 1, and the trigger circuit Trig triggers the first ADC chip and the second ADC chip to sample; the first integrator, the second integrator, the third integrator and the fourth integrator respectively restore the collected lightning current pulse signals passing through the grounding body into real lightning current signals and convert the real lightning current signals into measurable range values, then the real lightning current signals are respectively transmitted to the first peak holding circuit, the second peak holding circuit, the third peak holding circuit and the fourth peak holding circuit to hold the measured lightning current peak values for a long time, so that the first ADC chip collects the lightning current amplitude values, the voltage divider collects the overvoltage pulse signals from the grounding body to the earth outside the earth grid when sensing the overvoltage pulse signals and reduces the overvoltage pulse signals into real overvoltage signals and converts the overvoltage signals into the measurable range values, then the real overvoltage peak values are transmitted to the fifth peak holding circuit to hold the measured overvoltage peak values for a long time, so that the second ADC chip collects the overvoltage amplitude values, and the first ADC chip and the second ADC chip transmit the collected lightning current amplitude values and the collected overvoltage amplitude value data to the MCU chip, the impact grounding resistance of four grounding bodies and the impact grounding resistance value of the whole ground network are calculated by the MCU chip by utilizing the lightning current amplitude and the overvoltage amplitude, data are stored in the storage module and then are sent to a remote server through the wireless communication module, the display module and the input module are designed for man-machine interaction, monitored data can be checked at a monitoring terminal, and communication parameters, time and equipment information are set; the lightning current amplitude monitoring and the lightning overvoltage monitoring are integrated to measure the impulse grounding resistance, so that the influence of the grounding resistance on the lightning current discharge capacity can be truly reflected; providing data support for lightning stroke fault positioning and lightning stroke overvoltage analysis; data analysis is provided for ground truing.
In the above embodiment, the first lightning current sensor CH1, the second lightning current sensor CH2, the third lightning current sensor CH3 and the fourth lightning current sensor CH4 are all H-FCT-350 rogowski coil current sensors. The display module is an OLED display screen. The input module is a key. The wireless communication module can be in a pay communication mode such as 2G (NBIOT), 3G, 4G, 5G and the like, can also be in a free communication mode such as Lora, microwave and the like, is used for providing a wireless transmission channel of data, and can remotely transmit the data acquired by the device to a control center; the wireless communication module can be used for transmitting an operation instruction of the control center, and preferably, the wireless communication module is a GPRS module. Further, the storage module is a W25Q256FLASH memory. The MCU chip is an STM32F103 chip. The first ADC chip and the second ADC chip are both ADC3422 chips. The voltage divider adopts a PVM-100 high-frequency voltage divider.
In addition, the power supply unit is used for providing a power supply required by the device to work, and in order to meet the requirements of the field online monitoring device, the power supply unit adopts a solar panel to supply power, and the solar panel charges a storage battery through a charging controller, so that the monitoring device can run for a long time.
Claims (10)
1. The utility model provides an impulse grounding resistance measuring device based on lightning current monitoring which characterized in that: the device comprises a first lightning current sensor CH1, a second lightning current sensor CH2, a third lightning current sensor CH3, a fourth lightning current sensor CH4, a first integrator, a second integrator, a third integrator, a fourth integrator, a logic OR gate, a voltage divider, a first peak holding circuit, a second peak holding circuit, a third peak holding circuit, a fourth peak holding circuit, a fifth peak holding circuit, a trigger circuit Trig, a display module, an input module, a wireless communication module, a storage module, a first ADC chip, a second ADC chip, an MCU chip and a power supply unit;
the first lightning current sensor CH1, the second lightning current sensor CH2, the third lightning current sensor CH3 and the fourth lightning current sensor CH4 are respectively used for acquiring lightning current signals passing through a grounding body, and the voltage divider is used for acquiring an overvoltage value from the grounding body to the ground outside the grounding grid;
the output end of the first lightning current sensor CH1, the output end of the second lightning current sensor CH2, the output end of the third lightning current sensor CH3 and the output end of the fourth lightning current sensor CH4 are respectively connected with the input end of the first integrator, the input end of the second integrator, the input end of the third integrator and the input end of the fourth integrator;
the output end of the first integrator, the output end of the second integrator, the output end of the third integrator and the output end of the fourth integrator are respectively connected with the input end of the first peak holding circuit, the input end of the second peak holding circuit, the input end of the third peak holding circuit and the input end of the fourth peak holding circuit, and the output end of the voltage divider is connected with the input end of the fifth peak holding circuit;
the input end of the logic OR gate OR is respectively connected with the output end of the first lightning current sensor CH1, the output end of the second lightning current sensor CH2, the output end of the third lightning current sensor CH3 and the output end of the fourth lightning current sensor CH4, and the output end of the logic OR gate OR is connected with the input end of the trigger circuit Trig;
the output end of the trigger circuit Trig, the output end of the first peak holding circuit, the output end of the second peak holding circuit, the output end of the third peak holding circuit and the output end of the fourth peak holding circuit are respectively connected with the first ADC chip; the output end of the fifth peak holding circuit and the output end of the trigger circuit Trig are respectively connected with the second ADC chip;
the display module, the input module, the wireless communication module, the storage module, the first ADC chip and the second ADC chip are respectively connected with the MCU chip, and the power supply unit is respectively connected with the first lightning current sensor CH1, the second lightning current sensor CH2, the third lightning current sensor CH3, the fourth lightning current sensor CH4, the first integrator, the second integrator, the third integrator, the fourth integrator, the logical OR gate OR, the voltage divider, the first peak value holding circuit, the second peak value holding circuit, the third peak value holding circuit, the fourth peak value holding circuit, the fifth peak value holding circuit, the trigger circuit Trig, the display module, the input module, the wireless communication module, the storage module, the first ADC chip, the second ADC chip and the MCU chip in a power supply mode.
2. The impulse grounding resistance measuring device based on lightning current monitoring of claim 1, wherein: the first lightning current sensor CH1, the second lightning current sensor CH2, the third lightning current sensor CH3 and the fourth lightning current sensor CH4 are all H-FCT-350 Rogowski coil current sensors.
3. The impulse grounding resistance measuring device based on lightning current monitoring of claim 2, wherein: the display module is an OLED display screen.
4. The impulse grounding resistance measuring device based on lightning current monitoring of claim 3, wherein: the input module is a key.
5. The impulse grounding resistance measuring device based on lightning current monitoring of claim 4, wherein: the wireless communication module is a GPRS module.
6. The impulse grounding resistance measuring device based on lightning current monitoring of claim 5, wherein: the storage module is a W25Q256FLASH memory.
7. The impulse grounding resistance measuring device based on lightning current monitoring of claim 6, wherein: the MCU chip is an STM32F103 chip.
8. The lightning current monitoring-based impulse grounding resistance measurement device according to claim 7, wherein: the first ADC chip and the second ADC chip are both ADC3422 chips.
9. The lightning current monitoring-based impulse grounding resistance measurement device according to claim 8, wherein: the power supply unit comprises a storage battery and a solar panel, and the storage battery is connected with the solar panel through a charging controller.
10. The lightning current monitoring-based impulse grounding resistance measurement device according to claim 9, wherein: the voltage divider adopts a PVM-100 high-frequency voltage divider.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921785750.9U CN210894507U (en) | 2019-10-23 | 2019-10-23 | Impact grounding resistance measuring device based on lightning current monitoring |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921785750.9U CN210894507U (en) | 2019-10-23 | 2019-10-23 | Impact grounding resistance measuring device based on lightning current monitoring |
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| CN210894507U true CN210894507U (en) | 2020-06-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113406602A (en) * | 2021-05-21 | 2021-09-17 | 中山大学 | Pulse peak holding circuit and control method |
| CN114928514A (en) * | 2022-05-18 | 2022-08-19 | 深圳通业科技股份有限公司 | Multi-chip data transmission method, device, terminal and storage medium |
-
2019
- 2019-10-23 CN CN201921785750.9U patent/CN210894507U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113406602A (en) * | 2021-05-21 | 2021-09-17 | 中山大学 | Pulse peak holding circuit and control method |
| CN113406602B (en) * | 2021-05-21 | 2024-04-26 | 中山大学 | Pulse peak hold circuit and control method |
| CN114928514A (en) * | 2022-05-18 | 2022-08-19 | 深圳通业科技股份有限公司 | Multi-chip data transmission method, device, terminal and storage medium |
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