CN209764938U - Anti-interference lightning current waveform recording device - Google Patents

Abstract

The utility model discloses a can reject space forceful electric magnetism environmental disturbance and acquire complete thunderbolt current waveform, draw waveform, energy, take place anti-interference type lightning current waveform recorder of data such as moment. The device comprises a first sensor CH1, a second sensor CH2, a first traveling wave conditioning circuit AMP1, a second traveling wave conditioning circuit AMP2, a trigger circuit Trig, an LCD display screen, a keyboard, a memory module DDR SDRAM, a memory module EMMC, a 485 bus, an FPGA chip, an ADC chip, a DSP chip and a power supply unit. The anti-interference lightning current waveform recording device is accurate and reliable in recording lightning current, can eliminate spatial strong electromagnetic environment interference to obtain complete lightning current waveform, extract waveform, energy, occurrence time and other data, further improves stability and reliability of the lightning current recording device, and has lightning current waveform acquisition, recording, field display, parameter setting, historical record checking and data transmission functions. Is suitable for popularization and application in the field of on-line monitoring.

Description

Anti-interference lightning current waveform recording device

Technical Field

The utility model relates to an on-line monitoring field, concretely relates to anti-interference type lightning current waveform recording device.

Background

Lightning stroke is an important factor influencing the operation safety of a wind power plant, 1% -2% of wind turbine blades suffer from lightning stroke every year in the world, and other parts in a unit are damaged by the lightning stroke. In order to monitor and count the lightning strike condition of the wind turbine, a lightning detection facility is required to be installed in a lightning protection system of the wind turbine. At present, the wind turbine generally achieves the purpose through a lightning peak value recording card installed at the root of a blade, and the equipment can record and permanently store pulse current values on a magnetic card and is fixed on a down lead, so that the maximum pulse current value passing through an equipotential connecting line can be detected, and whether a lightning protection device plays a corresponding role can be checked at any time. The magnetic strip on the recording card is encoded in a special way, and because each electrified conductor can generate a magnetic field, the strength of the magnetic field has a functional relation with the current value of the wire, and the magnetic field can control the encoding of the magnetic strip. The electromagnetic code on the recording card can be identified by using a magnetic card reader, so that the magnitude of the pulse current is reflected. The device can only record the highest current peak value, and cannot record the number, time and other characteristics of lightning strikes suffered by the wind turbine within a period of time, when the lightning strikes on the components of the wind turbine, particularly damage, are not immediately reflected, whether damage to the blades and other equipment of the wind turbine is caused by the lightning strikes cannot be judged, even if the damage is caused by the lightning strikes, the specific time and other characteristics of the lightning strikes cannot be judged, convenience for statistics and related management is insufficient, and valuable data support cannot be provided for users. The prior art is mainly used for recording lightning stroke frequency, time, energy and lightning stroke place information, lightning stroke current waveform and polarity information are not given, and interference waveforms are not processed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that an anti-interference type lightning current waveform recorder that can reject space forceful electric magnetic environment interference and acquire complete lightning current waveform, draw waveform, energy, take place data such as constantly is provided.

The utility model provides a technical scheme that above-mentioned technical problem adopted is: the anti-interference lightning current waveform recording device comprises a first sensor CH1, a second sensor CH2, a first traveling wave conditioning circuit AMP1, a second traveling wave conditioning circuit AMP2, a trigger circuit Trig, an LCD display screen, a keyboard, a memory module DDR SDRAM, a memory module EMMC, a 485 bus, an FPGA chip, an ADC chip, a DSP chip and a power supply unit, wherein the output end of the first sensor CH1 is connected with the input end of the first traveling wave conditioning circuit AMP1, the output end of the second sensor CH2 is connected with the input end of the second traveling wave conditioning circuit AMP2, the input end of the trigger circuit Trig is respectively connected with the output end of the first sensor CH1 and the output end of the second sensor CH2, the output end of the trigger circuit Trig, the output end of the first traveling wave conditioning circuit AMP1 and the output end of the second traveling wave conditioning circuit AMP2 are respectively connected with the ADC chip, and the ADC chip, the SDRAM, the memory module DDR SDRAM, the first traveling wave conditioning circuit, The DSP chip is respectively connected with the FPGA chip, the memory module DDR SDRAM, the memory module EMMC, the 485 bus, the LCD display screen and the keyboard are respectively connected with the DSP chip, and the power supply unit is respectively connected with the first sensor CH1, the second sensor CH2, the first traveling wave conditioning circuit AMP1, the second traveling wave conditioning circuit AMP2, the trigger circuit Trig, the LCD display screen, the keyboard, the memory module DDR SDRAM, the memory module EMMC, the 485 bus, the FPGA chip, the ADC chip and the DSP chip in a power supply mode.

Further, the first sensor CH1 and the second sensor CH2 are both H-FCT-200 current sensors.

Further, the first sensor CH1 and the second sensor CH2 jointly form a rogowski dual-channel coil, the rogowski dual-channel coil includes an annular non-ferromagnetic material skeleton, a first copper wire and a second copper wire, the first copper wire and the second copper wire are respectively wound on the annular non-ferromagnetic material skeleton, the first copper wire and the second copper wire are arranged in parallel, an output end of the first copper wire is connected with an input end of the first traveling wave conditioning circuit AMP1, and an output end of the second copper wire is connected with an input end of the second traveling wave conditioning circuit AMP 2.

Further, the LCD display screen is an M24S1309 display screen, and the keyboard is a 4-key membrane keyboard.

Further, the DDR SDRAM is an MT41K128M8DA-107 memory module.

Further, the memory module EMMC is a KLM8G1GESD-B03P memory module.

Further, the 485 bus is a MAX3485 bus.

Further, the FPGA chip is a XILINX SPARTAN6 XC6SLX45 FPGA chip.

Further, the ADC chip is an ADC3221ADC chip.

Further, the DSP chip is a DSP-BF531SBSTZ400DSP chip.

The utility model has the advantages that: when the anti-interference lightning current waveform recording device is used, when lightning strike occurs, a first sensor CH1 senses a lightning strike current signal and respectively transmits the lightning strike current signal to a first traveling wave conditioning circuit AMP1 and a trigger circuit Trig, a second sensor CH2 senses a lightning strike current signal and respectively transmits the lightning strike current signal to a second traveling wave conditioning circuit AMP1 and a trigger circuit Trig, the trigger circuit Trig receives the lightning strike current signal and then triggers an ADC chip to sample, the FPGA chip and the DSP chip enter a data processing state, the system operation power consumption can be reduced through a triggering mode, the anti-interference lightning current waveform recording device is in a low power consumption operation mode under normal conditions, the FPGA chip, the DSP chip and the ADC chip start to work only when the lightning strike occurs, the first traveling wave conditioning circuit AMP1 and the second traveling wave conditioning circuit AMP2 respectively adjust the received lightning strike current signal to be within the sampling signal range of the ADC chip, the ADC chip performs analog-digital signal conversion after receiving the lightning strike current signal, providing data required by the comparison and analysis of a subsequent circuit, wherein the FPGA chip is used for controlling the ADC chip to complete the conversion of an analog digital signal, reading lightning current signal data converted by the ADC chip, temporarily storing the lightning current signal data in a memory module DDR SDRAM, then informing the DSP chip to process the data, reading the data from the memory module DDR SDRAM by the DSP chip, comparing the similarity of the two paths of obtained lightning current signal data to judge whether the lightning current signal is a lightning current or an interference signal, if the similarity of the two paths of lightning current waveforms meets the requirement, judging the lightning current signal to be effective waveform data, recording the effective waveform data in a storage module EMMC, transmitting the data to an upper computer through a 485 bus, wherein the 485 bus is also used for communicating with other submachine to send the lightning current signal, if the similarity of the two paths of the lightning current waveforms does not meet the requirement, rejecting the interference signal, storing the lightning current waveform data, The waveform similarity contrasts and analyzes, make the recording of this anti-interference type lightning current waveform recording device to the lightning current accurate and reliable, eliminated because the sensor circuit, the device self receives the mistake recording that external strong electromagnetic interference leads to, can reject the strong electromagnetic environmental interference of space and obtain complete lightning current waveform, draw the waveform, energy, data such as moment of occurrence have further promoted the stability, reliability of lightning current recording device, and still be provided with LCD display screen, keyboard, make it have lightning current waveform collection, record, on-the-spot show, parameter setting, history record look over, data transmission function.

Drawings

Fig. 1 is a schematic structural view of a monitoring device of an anti-interference lightning current waveform recording device according to the present invention;

Fig. 2 is a schematic structural diagram of the rogowski dual-channel coil according to the present invention;

Description of reference numerals: the first copper conductor 1, the second copper conductor 2, the non-ferromagnetic material skeleton 3.

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 anti-interference lightning current waveform recorder includes a first sensor CH1, a second sensor CH2, a first line wave conditioning circuit AMP1, a second line wave conditioning circuit AMP2, a trigger circuit Trig, an LCD display screen, a keyboard, a memory module DDR SDRAM, a memory module EMMC, a 485 bus, an FPGA chip, an ADC chip, a DSP chip, and a power supply unit, wherein an output terminal of the first sensor CH1 is connected to an input terminal of the first line wave conditioning circuit AMP1, an output terminal of the second sensor CH2 is connected to an input terminal of the second line wave conditioning circuit AMP2, an input terminal of the trigger circuit Trig is connected to an output terminal of the first sensor CH1 and an output terminal of the second sensor CH2, an output terminal of the trigger circuit Trig, an output terminal of the first line wave conditioning circuit AMP1, and an output terminal of the second line wave conditioning circuit AMP2 are connected to the ADC chip AMP chip, the ADC chip, the memory module DDR SDRAM and the DSP chip are respectively connected with the FPGA chip, the memory module DDR SDRAM, the storage module EMMC, the 485 bus, the LCD display screen and the keyboard are respectively connected with the DSP chip, and the power supply unit is respectively connected with the first sensor CH1, the second sensor CH2, the first traveling wave conditioning circuit AMP1, the second traveling wave conditioning circuit AMP2, the trigger circuit Trig, the LCD display screen, the keyboard, the memory module DDR SDRAM, the storage module EMMC, the 485 bus, the FPGA chip, the ADC chip and the DSP chip in a power supply mode. When the anti-interference lightning current waveform recording device is used, when lightning strike occurs, a first sensor CH1 senses a lightning strike current signal and respectively transmits the lightning strike current signal to a first traveling wave conditioning circuit AMP1 and a trigger circuit Trig, a second sensor CH2 senses a lightning strike current signal and respectively transmits the lightning strike current signal to a second traveling wave conditioning circuit AMP1 and a trigger circuit Trig, the trigger circuit Trig receives the lightning strike current signal and then triggers an ADC chip to sample, the FPGA chip and the DSP chip enter a data processing state, the system operation power consumption can be reduced through a triggering mode, the anti-interference lightning current waveform recording device is in a low power consumption operation mode under normal conditions, the FPGA chip, the DSP chip and the ADC chip start to work only when the lightning strike occurs, the first traveling wave conditioning circuit AMP1 and the second traveling wave conditioning circuit AMP2 respectively adjust the received lightning strike current signal to be within the sampling signal range of the ADC chip, the ADC chip performs analog-digital signal conversion after receiving the lightning strike current signal, providing data required by the comparison and analysis of a subsequent circuit, wherein the FPGA chip is used for controlling the ADC chip to complete the conversion of an analog digital signal, reading lightning current signal data converted by the ADC chip, temporarily storing the lightning current signal data in a memory module DDR SDRAM, then informing the DSP chip to process the data, reading the data from the memory module DDR SDRAM by the DSP chip, comparing the similarity of the two paths of obtained lightning current signal data to judge whether the lightning current signal is a lightning current or an interference signal, if the similarity of the two paths of lightning current waveforms meets the requirement, judging the lightning current signal to be effective waveform data, recording the effective waveform data in a storage module EMMC, transmitting the data to an upper computer through a 485 bus, wherein the 485 bus is also used for communicating with other submachine to send the lightning current signal, if the similarity of the two paths of the lightning current waveforms does not meet the requirement, rejecting the interference signal, storing the lightning current waveform data, The waveform similarity contrasts and analyzes, make the recording of this anti-interference type lightning current waveform recording device to the lightning current accurate and reliable, eliminated because the sensor circuit, the device self receives the mistake recording that external strong electromagnetic interference leads to, can reject the strong electromagnetic environmental interference of space and obtain complete lightning current waveform, draw the waveform, energy, data such as moment of occurrence have further promoted the stability, reliability of lightning current recording device, and still be provided with LCD display screen, keyboard, make it have lightning current waveform collection, record, on-the-spot show, parameter setting, history record look over, data transmission function.

In the above embodiment, the first sensor CH1 and the second sensor CH2 may adopt the existing rogowski coils, that is, the first sensor CH1 and the second sensor CH2 are both H-FCT-200 current sensors. The existing Rogowski coil sensor is composed of an annular coil uniformly wound on a non-ferromagnetic material 3 and a group of lead-out cables as output ports. When there is an interference signal at the output port of the sensor due to external factors such as space electromagnetic radiation, vibration, touch and the like on the rogowski coil body, the acquisition device at the rear end can mistakenly acquire the interference signal as an effective signal, thereby causing misjudgment. In order to solve the problem, the utility model provides a constitute a luo shi dual-channel coil with first sensor CH1, second sensor CH2 two unifications, luo shi dual-channel coil includes annular non-ferromagnetic material skeleton 3, first copper conductor 1, second copper conductor 2 twine respectively on annular non-ferromagnetic material skeleton 3, and first copper conductor 1, second copper conductor 2 parallel and parallel arrangement each other, and the output of first copper conductor 1 links to each other with first travelling wave conditioning circuit AMP 1's input, and the output of second copper conductor 2 links to each other with second travelling wave conditioning circuit AMP 2's input. Two copper wires are wound on the same non-ferromagnetic material framework 3 in parallel to form a dual-channel signal output port, two groups of comparison signals can be provided for the anti-interference design of current collection by adopting a Rogowski dual-channel coil, the dual-channel Rogowski coil is formed by winding two groups of copper wires with the same specification on the same non-ferromagnetic material framework 3 in parallel, each group of copper wires outputs one pair of signal wires, two groups of induced lightning stroke current signals are provided for a collection device, and when interference signals occur, the signals passing through the two channels can be judged to be effective real current passing through a measured object or interference signals from the analysis of time domain, waveform characteristic frequency domain and time domain. The problem that an interference signal generated in the coil by the existing single-channel Rogowski coil cannot be effectively distinguished from a measured signal is solved, and particularly the problem that the interference signal with the frequency basically the same as that of the measured signal is distinguished from the measured signal is solved.

In order to accurately eliminate the strong electromagnetic environment interference in the space to obtain complete lightning current waveform, extract waveform, energy, occurrence time and other data, the LCD display screen is an M24S1309 display screen, the keyboard is a 4-key film keyboard, the LCD and the keyboard are used for displaying the functions of waveform, parameter setting, history record checking and the like on site, the DDR SDRAM is an MT41K128M8DA-107 memory module, the EMMC is a KLM8G1GESD-B03P memory module, the 485 bus is an MAX3485 bus, the FPGA chip is an XILINX SPARTAN6 XC6SLX45 FPGA chip, the ADC chip is an ADC3221ADC chip, and the DSP chip is a DSP-BF531SBSTZ400DSP chip. The power supply unit is used for providing a power supply required by the device to work, and supports 100-240V wide-range alternating current power supply, 12V direct current power supply and solar power supply.

Claims (10)

1. An anti-interference lightning current waveform recording device is characterized in that: the sensor comprises a first sensor CH1, a second sensor CH2, a first traveling wave conditioning circuit AMP1, a second traveling wave conditioning circuit AMP2, a trigger circuit Trig, an LCD display screen, a keyboard, a memory module DDR SDRAM, a memory module EMMC, a 485 bus, an FPGA chip, an ADC chip, a DSP chip and a power supply unit, wherein the output end of the first sensor CH1 is connected with the input end of the first traveling wave conditioning circuit AMP1, the output end of the second sensor CH2 is connected with the input end of the second traveling wave conditioning circuit AMP2, the input end of the trigger circuit Trig is respectively connected with the output end of the first sensor CH1 and the output end of the second sensor CH2, the output end of the trigger circuit Trig, the output end of the first traveling wave conditioning circuit AMP1 and the output end of the second traveling wave conditioning circuit AMP2 are respectively connected with the ADC chip, the memory module DDR SDRAM, the DSP chip and the memory module DDR SDRAM chip are respectively connected with the FPGA SDRAM chip, the keyboard, the storage module EMMC, the 485 bus, the LCD display screen and the keyboard are respectively connected with the DSP chip, and the power supply unit is respectively connected with the first sensor CH1, the second sensor CH2, the first traveling wave conditioning circuit AMP1, the second traveling wave conditioning circuit AMP2, the trigger circuit Trig, the LCD display screen, the keyboard, the memory module DDR SDRAM, the storage module EMMC, the 485 bus, the FPGA chip, the ADC chip and the DSP chip in a power supply mode.

2. The anti-jamming lightning current waveform recording device according to claim 1, wherein: the first sensor CH1 and the second sensor CH2 are both H-FCT-200 current sensors.

3. The anti-jamming lightning current waveform recording device according to claim 1, wherein: the Rogowski double-channel coil is composed of the first sensor CH1 and the second sensor CH2, and comprises an annular non-ferromagnetic material framework (3), a first copper wire (1) and a second copper wire (2), wherein the first copper wire (1) and the second copper wire (2) are wound on the annular non-ferromagnetic material framework (3) respectively, the first copper wire (1) and the second copper wire (2) are arranged in parallel, the output end of the first copper wire (1) is connected with the input end of the first traveling wave conditioning circuit AMP1, and the output end of the second copper wire (2) is connected with the input end of the second traveling wave conditioning circuit AMP 2.

4. The anti-jamming lightning current waveform recording device according to claim 1, wherein: the LCD display screen is an M24S1309 display screen, and the keyboard is a 4-key thin-film keyboard.

5. The anti-jamming lightning current waveform recording device according to claim 1, wherein: the DDR SDRAM is an MT41K128M8DA-107 memory module.

6. The anti-jamming lightning current waveform recording device according to claim 1, wherein: the storage module EMMC is a KLM8G1GESD-B03P storage module.

7. The anti-jamming lightning current waveform recording device according to claim 1, wherein: the 485 bus is a MAX3485 bus.

8. The anti-jamming lightning current waveform recording device according to claim 1, wherein: the FPGA chip is a XILINX SPARTAN6 XC6SLX45 FPGA chip.

9. the anti-jamming lightning current waveform recording device according to claim 1, wherein: the ADC chip is an ADC3221ADC chip.

10. the anti-jamming lightning current waveform recording device according to claim 1, wherein: the DSP chip is a DSP-BF531SBSTZ400DSP chip.