CN210665997U - Portable ultra-fast transient high-frequency magnetic field measurement system - Google Patents
Portable ultra-fast transient high-frequency magnetic field measurement system Download PDFInfo
- Publication number
- CN210665997U CN210665997U CN201920935018.9U CN201920935018U CN210665997U CN 210665997 U CN210665997 U CN 210665997U CN 201920935018 U CN201920935018 U CN 201920935018U CN 210665997 U CN210665997 U CN 210665997U
- Authority
- CN
- China
- Prior art keywords
- signal
- electromagnetic wave
- antenna
- wave receiving
- receiving antenna
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Measuring Magnetic Variables (AREA)
Abstract
The utility model provides a portable quick transient state high frequency magnetic field measurement system for measure GIS transformer substation high frequency transient state magnetic field. The measurement system includes: the electromagnetic wave receiving antenna is used for receiving the very fast transient high-frequency magnetic field signal released by the GIS switch; the input end of the synchronous trigger device is connected with the tail end of the electromagnetic wave receiving antenna and used for outputting a trigger signal under the condition that a receiving signal of the electromagnetic wave receiving antenna is within a preset frequency range; the input end of the signal processing circuit is also connected with the tail end of the electromagnetic wave receiving antenna and is used for processing the received signal of the electromagnetic wave receiving antenna into a digital signal; and the signal processor is respectively connected with the synchronous trigger device and the signal processing circuit and is configured to be started according to the trigger signal so as to process the digital signal. Since the signal processor is started according to the synchronous trigger signal, the power consumption is reduced, and the storage space is saved, thereby saving the storage capacity required by the measuring system.
Description
Technical Field
The utility model relates to a power equipment measures technical field, especially relates to a portable quick transient state high frequency magnetic field measurement system.
Background
With the application of a GIS (Gas Insulated Switchgear) transformer substation in a power grid in China becoming more and more extensive, the intelligentization level of the power grid becomes higher and higher, and the problem of electromagnetic compatibility of the transformer substation becomes more and more prominent. Because secondary equipment such as a merging unit of an intelligent substation, an intelligent terminal and the like is positioned near primary equipment of a switch field and the shielding protection of a relay protection room is lost, the low-power electronic devices based on the microcomputer principle are easily subjected to electromagnetic interference when the substation is subjected to switch operation, system short circuit or lightning stroke, and particularly space transient electromagnetic field (TEM) generated by the switch operation has great influence on the safe and reliable operation of the substation. Therefore, the device for measuring the ultra-fast high-frequency transient electromagnetic field generated by GIS switch operation is very important for ensuring the reliable and safe operation of the intelligent transformer substation.
The magnetic field that GIS transformer substation's on-off operation produced is a very fast transient state high frequency magnetic field that appears along with on-off operation electromagnetism transient state, has that magnetic field pulse rising edge is steep, and amplitude change is quick, characteristics such as frequency height, and main technical indicator parameter is: the frequency is mainly distributed between 1MHz and 60MHz, the field intensity (peak value-peak value) range is between 80A/m and 110A/m, and the characteristics of the ultra-fast transient high-frequency magnetic field cause that the existing magnetic field measuring technology and device can not meet the measuring requirements.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a satisfy GIS transformer substation high frequency transient state magnetic field measurement requirement's portable very fast transient state high frequency magnetic field measurement system.
The utility model discloses a further purpose saves the required storage capacity of measurement system.
The utility model discloses another further purpose improves the accuracy nature of the radiation magnetic field measurement that produces when acting to the GIS switch.
The utility model discloses another further purpose makes the measurement system structure compacter, improves the portability.
Particularly, the utility model provides a portable extremely fast transient state high frequency magnetic field measurement system, include:
the electromagnetic wave receiving antenna is used for receiving the very fast transient high-frequency magnetic field signal released by the GIS switch;
the input end of the synchronous trigger device is connected with the tail end of the electromagnetic wave receiving antenna and used for outputting a trigger signal under the condition that a receiving signal of the electromagnetic wave receiving antenna is within a preset frequency range;
the input end of the signal processing circuit is also connected with the tail end of the electromagnetic wave receiving antenna and is used for processing the received signal of the electromagnetic wave receiving antenna into a digital signal;
and the signal processor is respectively connected with the synchronous trigger device and the signal processing circuit and is configured to be started according to the trigger signal so as to process the digital signal.
Optionally, the signal processing circuit comprises:
the input end of the antenna signal receiving circuit is connected with the tail end of the electromagnetic wave receiving antenna and is used for carrying out signal conditioning on a received signal of the electromagnetic wave receiving antenna;
the electro-optical modulator is connected with the output end of the antenna signal receiving circuit and is used for modulating the output signal of the antenna signal receiving circuit into an optical signal;
the first transmission optical fiber is connected with an optical output port of the electro-optical modulator and used for outputting optical signals;
the first photoelectric conversion circuit is connected with the first transmission optical fiber and used for converting the optical signal into an electric signal;
and the sampling circuit is connected with the photoelectric conversion circuit and the signal processor and is used for sampling the electric signals to obtain digital signals.
Optionally, an optical signal output circuit is arranged in the synchronous trigger device, and the optical signal output circuit is triggered by an antenna receiving signal in a preset frequency range to output a trigger signal in an optical form;
the above-mentioned measuring system further includes: the second transmission optical fiber is connected with the optical signal output circuit and used for outputting a trigger signal; and the second photoelectric conversion circuit is connected with the second transmission optical fiber and used for converting the trigger signal into an electric trigger signal and providing the electric trigger signal for the signal processor.
Optionally, the measurement system further includes: the shielding shell is internally provided with a component mounting cavity, and the antenna signal receiving circuit, the electro-optic modulator and the synchronous trigger device are mounted in the component mounting cavity; the first transmission optical fiber, the second transmission optical fiber and the electromagnetic wave receiving antenna penetrate out of the shielding shell.
Optionally, the shielding case is an aluminum box and is grounded through a ground wire, and the first transmission optical fiber, the second transmission optical fiber, and the electromagnetic wave receiving antenna are provided with a waterproof sealing structure from a position where they pass through the shielding case.
Optionally, the electromagnetic wave receiving antenna is a loop antenna, and a signal receiving frequency range of the loop antenna is configured to be 10kHz to 500 MHz.
Optionally, the antenna signal receiving circuit includes a fast FET op-amp with a high input resistance, a non-inverting input terminal of the op-amp is connected to a PIN limiter, an inverting input terminal of the op-amp is connected to a voltage follower, and an output terminal of the op-amp is connected to the electro-optic modulator.
Optionally, the electro-optic modulator comprises:
the laser is used for emitting laser beams, and optical parameters of the laser beams change along with output signals of the antenna signal receiving circuit;
the polarizer is used for converting the laser beam after incidence into linearly polarized light;
the lithium niobate crystal is used for decomposing linearly polarized light into two vertical components;
a delay slide for generating a set phase difference by delaying the two perpendicular components; and
and the analyzer outputs an optical signal generating a phase difference.
Optionally, the measurement system further includes:
the display screen is connected with the signal processor and used for restoring the high-frequency transient magnetic field waveform according to the digital signal;
and the external memory interface is connected with the signal processor and is used for connecting an external memory for data output.
Optionally, the first photoelectric conversion circuit, the second photoelectric conversion circuit, the signal processor, the synchronous trigger device, the display screen, and the external memory interface are integrated on a PCB.
The utility model discloses a portable quick transient state high frequency magnetic field measurement system, the quick transient state high frequency magnetic field signal of GIS switch release is received to electromagnetic wave receiving antenna, synchronous trigger device, can be in the receiving signal of electromagnetic wave receiving antenna under the condition of presetting frequency range (this frequency range sets for according to magnetic field frequency when GIS moves, can be for higher frequency), output trigger signal, response time can reach nanosecond level, use the synchronous triggering mode of multiple spot light signal to improve anti-electromagnetic interference ability, make signal processor start according to synchronous trigger signal, signal processing circuit handles the receiving signal of electromagnetic wave receiving antenna into digital signal; the signal processor is started according to the trigger signal to process the digital signal. Since the signal processor is started according to the synchronous trigger signal, the power consumption is reduced, and the storage space is saved, thereby saving the storage capacity required by the measuring system.
Further, the utility model discloses a portable extremely fast transient state high frequency magnetic field measurement system, the extremely fast transient state high frequency magnetic field signal of electromagnetic wave receiving antenna receiving GIS switch release, extremely fast transient state high frequency magnetic field signal carry out the signal conditioning back to received signal through antenna signal receiving circuit, are the light signal by the modulation of electro-optical modulator. The first photoelectric conversion circuit converts the optical signal into an electrical signal; the sampling circuit samples the electric signal, and the signal processor is used for processing and storing the sampled data. Through hardware optimization, the measurement system can meet the measurement requirement of a GIS transformer substation high-frequency transient magnetic field. Due to the adoption of optical signal transmission, interference and attenuation in the transmission process are avoided, so that the measurement accuracy is provided, and the support is provided for evaluating the electromagnetic compatibility level of the GIS substation.
Furthermore, the utility model discloses an among the portable extremely quick transient state high frequency magnetic field measurement system, sampling circuit (including AD conversion function) connects signal processor to with first photoelectric conversion circuit, second photoelectric conversion circuit, signal processor, synchronous trigger device, display screen, external memory interface integration on a PCB board, reduced the system volume, improved portable.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic diagram of a portable ultra-fast transient high-frequency magnetic field measurement system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a signal processing circuit in a portable ultra-fast transient high-frequency magnetic field measurement system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an antenna signal receiving circuit in a portable ultra-fast transient high-frequency magnetic field measurement system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an electro-optic modulator in a portable ultra-fast transient high frequency magnetic field measurement system according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a first photoelectric conversion circuit in the portable ultra-fast transient high-frequency magnetic field measurement system according to an embodiment of the present invention; and
fig. 6 is a schematic diagram of a synchronous triggering device in a portable ultra-fast transient high-frequency magnetic field measurement system according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic diagram of a portable ultra-fast transient high frequency magnetic field measurement system 10 according to an embodiment of the present invention. The portable ultra-fast transient high frequency magnetic field measurement system 10 may generally include: the electromagnetic wave receiving antenna 110, the synchronous trigger device 140, the signal processing circuit 300, and the signal processor 340.
The portable ultra-fast transient high frequency magnetic field measurement system 10 may also have a shielded enclosure 150. The shield case 150 has a component mounting cavity formed therein. The shielding case 150 may be an aluminum box and is grounded through a ground wire, and a preferred embodiment is that the shielding case 150 is made of a 3mm thick aluminum metal material, and the size may be 100 × 100 × 75mm, which meets the electromagnetic shielding requirement and the safety requirement.
The electromagnetic wave receiving antenna 110 is used for receiving the very fast transient high-frequency magnetic field signal released by the GIS switch. The electromagnetic wave receiving antenna 110 may adopt a loop structure, and the diameter of the loop antenna may be determined according to the amplitude-frequency characteristic of the magnetic field to be measured. The utility model provides a pair of portable quick transient state high frequency magnetic field measurement system 10's an embodiment chooses the antenna diameter to get 250mm, and measurable quantity magnetic field frequency range is 100kHz ~ 150 MHz.
The input end of the synchronization triggering device 140 is connected to the tail end of the electromagnetic wave receiving antenna 110, and is configured to output a triggering signal when the receiving signal of the electromagnetic wave receiving antenna 110 is within a preset frequency range.
The input terminal of the signal processing circuit 300 is also connected to the tail end of the electromagnetic wave receiving antenna 110, and is used for processing the received signal of the electromagnetic wave receiving antenna 110 into a digital signal.
The signal processor 340 is connected to the synchronization triggering device 140 and the signal processing circuit 300, and configured to be activated according to the triggering signal to process the digital signal. In the portable ultra-fast transient high-frequency magnetic field measurement system 10 of this embodiment, the electromagnetic wave receiving antenna 110 receives an ultra-fast transient high-frequency magnetic field signal released by the GIS switch, the synchronous trigger device 140 can output a trigger signal when the received signal of the electromagnetic wave receiving antenna 110 is within a preset frequency range (the frequency range is set according to the magnetic field frequency during GIS action, and may be a higher frequency), the response time can reach nanosecond level, the anti-electromagnetic interference capability is improved by using a multipoint optical signal synchronous trigger mode, so that the signal processor 340 is started according to the synchronous trigger signal, and the signal processing circuit processes the received signal of the electromagnetic wave receiving antenna into a digital signal; the signal processor 340 is activated according to the trigger signal to process the digital signal. Since the signal processor 340 is activated based on the synchronization trigger signal, power consumption is reduced and memory space is saved, thereby saving the memory capacity required by the measurement system 10.
Fig. 2 is a schematic diagram of a signal processing circuit 300 in the portable ultra-fast transient high-frequency magnetic field measurement system 10 according to an embodiment of the present invention.
The portable ultra-fast transient high frequency magnetic field measurement system 10 may also have a shielded enclosure 150. The shield case 150 has a component mounting cavity formed therein. The shielding case 150 may be an aluminum box and is grounded through a ground wire, and a preferred embodiment is that the shielding case 150 is made of a 3mm thick aluminum metal material, and the size may be 100 × 100 × 75mm, which meets the electromagnetic shielding requirement and the safety requirement.
The electromagnetic wave receiving antenna 110 may be installed outside the shield case 150 with its tail end penetrating into the component installation cavity to be connected to the antenna signal receiving circuit 120 in the signal processing circuit 300. The portable ultra-fast transient high-frequency magnetic field measurement system 10 is used to be disposed in a magnetic field measurement area at the time of measurement, with the electromagnetic wave receiving antenna 110 being perpendicular to the ground.
The signal processing circuit 300 may include: the antenna signal receiving circuit 120, the electro-optical modulator 130, the first transmission optical fiber 210, the first photoelectric conversion circuit 310, and the sampling circuit 330.
The antenna signal receiving circuit 120 is installed in the component installation cavity, and an input end of the antenna signal receiving circuit is connected to the tail end of the electromagnetic wave receiving antenna 110, and is used for performing signal conditioning on a received signal of the electromagnetic wave receiving antenna 110. Fig. 3 is a schematic diagram of an antenna signal receiving circuit 120 in the portable ultra-fast transient high-frequency magnetic field measurement system 10 according to an embodiment of the present invention. The antenna signal receiving circuit 120 comprises a fast FET OP1 (field effect transistor operational amplifier) with high input resistance, the non-inverting input terminal of the OP1 is connected with a PIN limiter (diode limiter), the inverting input terminal of the OP1 is connected with a voltage follower, and the output terminal of the OP1 is connected with the electro-optical modulator 130. In an alternative embodiment, a FET operational amplifier model ADA4817 may be used.
An electro-optic modulator 130 is also mounted within the component mounting cavity. The electro-optical modulator 130 is coupled to an output terminal of the antenna signal receiving circuit 120, and is configured to modulate an output signal of the antenna signal receiving circuit 120 into an optical signal. Fig. 4 is a schematic diagram of the electro-optic modulator 130 in the portable ultra-fast transient high frequency magnetic field measurement system 10 according to an embodiment of the present invention. The electro-optical modulator 130 includes: a laser 131, a polarizer 132, a lithium niobate crystal 133, a retardation slide 134, and an analyzer 135. The laser 131 is used to emit a laser beam whose optical parameter changes with the output signal of the antenna signal receiving circuit 120. For example, the modulation signal may be applied to a modulator external to laser 131 such that the optical parameter of the laser beam passing through the modulator changes with the signal. The polarizer 132 is used to convert the laser beam into linearly polarized light after incidence. The lithium niobate crystal 133 is used to decompose linearly polarized light into two perpendicular components; the delay slide 134 is used for generating a set phase difference between the two perpendicular components by delaying; and the analyzer 135 outputs an optical signal that produces a phase difference. For example, the transmission of signals within the electro-optic modulator 130 is: the optical parameter of the laser beam passing through the modulator is changed with the signal, the incident light generated by the laser 131 is changed into linearly polarized light through the polarizer 132, and is decomposed into two vertical components after entering the lithium niobate crystal 133, and is subjected to pi/2 fixed phase difference generated by the two components through a 1/4 delay slide 134, and finally modulated light is output through the analyzer 135. The electro-optic modulator 130 may also use a collimator as the optical signal output interface.
The first transmission optical fiber 210 is connected to the optical output port of the electro-optical modulator 130 for outputting an optical signal. The first transmission fiber 210 may be a multimode fiber, and a waterproof sealing structure is disposed at a connection point with the electro-optical modulator 130, that is, the multimode fiber housing and the interface have good waterproof sealing performance.
The first photoelectric conversion circuit 310 is connected to the first transmission optical fiber 210, and is configured to convert an optical signal into an electrical signal; fig. 5 is a schematic diagram of a first photoelectric conversion circuit 310 in the portable ultra-fast transient high-frequency magnetic field measurement system 10 according to an embodiment of the present invention. The first photoelectric conversion circuit 310 may receive the modulated optical signal input from the first transmission fiber 210 using a PIN photodiode L1. Optionally, the converted electrical signal is amplified using two cascaded OPA658 amplifiers OP2, OP3 and the amplification is adjusted by selecting the appropriate resistance value.
The sampling circuit 330 is connected to the first photoelectric conversion circuit 310, and is configured to sample the electrical signal, so as to implement an a/D (analog-to-digital conversion) sampling function, for example, a dual 8-bit high-speed a/D converter, such as MXT2001, may be selected, and the performance thereof should approach or achieve the following condition: 8-bit sampling precision, a single-channel sampling rate of 1.3GS/s, and preferably a high-speed analog-to-digital conversion circuit and a digital self-calibration technology are adopted, so that the high-speed and high-dynamic characteristics of the device are ensured. A serial interface can be integrated in the A/D device, and user control and circuit parameter change are supported, so that the performance is improved and the system requirement is met.
And the signal processor 340 is connected with the sampling circuit 330 and used for processing and storing the sampling data. The Signal Processor 340 may be a DSP (Digital Signal Processor), for example, a DSP with a model number of TMS320DM8167SCYG4, a maximum clock frequency of 1.2GHz, a data RAM size of 64kB, and a data bus width of 32 bit.
The measurement system 10 of this embodiment can satisfy the measurement requirement of the high-frequency transient magnetic field of the GIS substation through hardware optimization. Due to the adoption of optical signal transmission, interference and attenuation in the transmission process are avoided, so that the measurement accuracy is provided, and the support is provided for evaluating the electromagnetic compatibility level of the GIS substation. The specific device models mentioned in the measurement system 10 of the present embodiment are exemplary, and one skilled in the art can select similar devices with the same function and similar or higher performance as required.
The synchronous triggering device 140 is also installed in the component installation cavity, and an optical signal output circuit is arranged in the synchronous triggering device, and is triggered by the antenna receiving signal in the preset frequency range to output a triggering signal in the form of light; the measurement system 10 further includes a second transmission fiber 220 and an optical signal output circuit for outputting a trigger signal; and the signal processing circuit 300 further comprises: and a second photoelectric conversion circuit 320 connected to the second transmission fiber 220, for converting the trigger signal into an electrical trigger signal, and providing the electrical trigger signal to the signal processor 340.
Fig. 6 is a schematic diagram of a synchronous triggering device 140 in the portable ultra-fast transient high-frequency magnetic field measurement system 10 according to an embodiment of the present invention. The synchronous trigger device 140 adopts a multi-point synchronous trigger mode, when the synchronous trigger device 140 receives electromagnetic waves of a higher frequency band, energy of the electromagnetic waves can conduct a triode Q1 in the electro-optical conversion circuit, so as to drive a plurality of light emitting diodes L2 to generate optical signals, the optical signals are coupled to the second transmission optical fibers 220 and respectively transmitted to the second electro-optical conversion circuit 320, the optical signals are converted into electrical signals, and then the signal processor 340(DSP main control chip) is triggered to start working.
The second transmission optical fiber 220 and the second photoelectric conversion circuit 320 may respectively adopt the same scheme as the first transmission optical fiber 210 and the first photoelectric conversion circuit 310, that is, the second transmission optical fiber 220 adopts a multimode optical fiber, and a waterproof sealing structure is arranged at a connection part with the shielding housing 150; the second photoelectric conversion circuit 320 amplifies the converted electric signal using two cascade-connected OPA658 amplifiers and adjusts the amplification factor by selecting an appropriate resistance value.
The portable ultra-fast transient high-frequency magnetic field measurement system 10 of the present embodiment may further include: a display 350 and an external memory interface 360. The display screen 350 is connected with the signal processor 340 and is used for restoring a high-frequency transient magnetic field waveform according to the sampling signal; and an external memory interface 360 connected to the signal processor 340 for connecting to an external memory for data output. The display 350 may use an LCD (liquid crystal display), and the processing result (e.g., amplitude, frequency spectrum, etc.) of the signal by the signal processor 340 may also be output through the display 350. The external memory interface 360 may use an SD card socket so that data can be copied out.
The portable ultra-fast transient high-frequency magnetic field measurement system 10 of the present embodiment may further include a power supply module (not shown in the figure). The power module can step down the steady voltage with 220V power frequency alternating current and give each part power supply again, for example can step down, contravariant, steady voltage, output after the filtering stabilizes 3.3V, 5V direct current 220V power frequency alternating current.
The portable ultra-fast transient high-frequency magnetic field measurement system 10 of the present embodiment may further include a set/reset circuit, an input module (neither shown), and the like. The set/reset circuit is used to reset the measurement system 10 to restore normal measurements of the system 10 when a fault occurs. The input module can be used for a user to input operation instructions, such as data copying and parameter setting.
When the portable ultra-fast transient high-frequency magnetic field measuring system 10 of the embodiment is used, the system is horizontally placed in a measured space, the electromagnetic wave receiving antenna 110 is perpendicular to the ground, when a high-frequency transient magnetic field generated by the switching operation of the GIS substation is received by the electromagnetic wave receiving antenna 110, the antenna signal receiving circuit 120 transmits signals to the synchronous trigger device 140 and the electro-optical modulator 130, when the synchronous trigger device 140 receives electromagnetic waves with a higher frequency band, energy of the electromagnetic waves can conduct a triode in an optical signal output circuit, so as to drive a plurality of light emitting diodes to generate optical signals, the optical signals are coupled to a plurality of multimode optical fibers and transmitted to a plurality of photoelectric conversion circuits at the rear end, the optical signals are converted into electrical signals, so that the signal processor 340 is triggered to start working, the sampling circuit 330 converts analog electrical signals output by the photoelectric conversion circuits into digital signals and provides the digital signals to the, finally, a high-frequency transient magnetic field waveform is generated on the display screen 350, and the acquired data is stored in the SD card. Through tests, the frequency band range measured by the measuring system 10 of the embodiment can reach 100 kHz-150 MHz, the measuring amplitude range can reach 0-150A/m, and a high-frequency transient magnetic field generated by GIS substation switch operation can be effectively measured.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described in detail herein, many other variations and modifications can be made, consistent with the principles of the invention, which are directly determined or derived from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A portable ultra-fast transient high-frequency magnetic field measurement system, comprising:
the electromagnetic wave receiving antenna is used for receiving the very fast transient high-frequency magnetic field signal released by the GIS switch;
the input end of the synchronous trigger device is connected with the tail end of the electromagnetic wave receiving antenna and used for outputting a trigger signal under the condition that a receiving signal of the electromagnetic wave receiving antenna is within a preset frequency range;
the input end of the signal processing circuit is also connected with the tail end of the electromagnetic wave receiving antenna and is used for processing the received signal of the electromagnetic wave receiving antenna into a digital signal;
and the signal processor is respectively connected with the synchronous trigger device and the signal processing circuit and is configured to be started according to the trigger signal so as to process the digital signal.
2. The measurement system of claim 1, wherein the signal processing circuit comprises:
the input end of the antenna signal receiving circuit is connected with the tail end of the electromagnetic wave receiving antenna and is used for carrying out signal conditioning on the received signal of the electromagnetic wave receiving antenna;
the electro-optical modulator is connected with the output end of the antenna signal receiving circuit and is used for modulating the output signal of the antenna signal receiving circuit into an optical signal;
the first transmission optical fiber is connected with an optical output port of the electro-optical modulator and used for outputting the optical signal;
the first photoelectric conversion circuit is connected with the first transmission optical fiber and used for converting the optical signal into an electric signal;
and the sampling circuit is connected with the photoelectric conversion circuit and the signal processor and is used for sampling the electric signals to obtain the digital signals.
3. Measuring system according to claim 2, characterized in that
An optical signal output circuit is arranged in the synchronous trigger device, and is triggered by the antenna receiving signal in the preset frequency range to output the trigger signal in the form of light;
the measurement system further comprises:
the second transmission optical fiber is connected with the optical signal output circuit and used for outputting the trigger signal;
and the second photoelectric conversion circuit is connected with the second transmission optical fiber and used for converting the trigger signal into an electric trigger signal and providing the electric trigger signal for the signal processor.
4. The measurement system of claim 3, further comprising:
a shielding housing, in which a component mounting cavity is formed, and the antenna signal receiving circuit, the electro-optical modulator and the synchronous trigger device are mounted in the component mounting cavity; the first transmission optical fiber, the second transmission optical fiber and the electromagnetic wave receiving antenna penetrate out of the shielding shell.
5. Measuring system according to claim 4, characterized in that
The shielding shell is an aluminum box and is grounded through a grounding wire, and the first transmission optical fiber, the second transmission optical fiber and the electromagnetic wave receiving antenna are provided with waterproof sealing structures at positions penetrating out of the shielding shell.
6. Measuring system according to claim 2, characterized in that
The electromagnetic wave receiving antenna is a loop antenna, and the signal receiving frequency range of the electromagnetic wave receiving antenna is configured to be 10 kHz-500 MHz.
7. Measuring system according to claim 2, characterized in that
The antenna signal receiving circuit comprises a rapid FET operational amplifier with high input resistance, wherein the in-phase input end of the operational amplifier is connected with a PIN amplitude limiter, the reverse phase input end of the operational amplifier is connected with a voltage follower, and the output end of the operational amplifier is connected with the electro-optic modulator.
8. The measurement system according to claim 2, wherein the electro-optical modulator comprises:
the laser is used for emitting laser beams, and optical parameters of the laser beams change along with output signals of the antenna signal receiving circuit;
the polarizer is used for converting the laser beam after incidence into linearly polarized light;
the lithium niobate crystal is used for decomposing the linearly polarized light into two vertical components;
a delay slide for generating a set phase difference by delaying the two perpendicular components; and
and the analyzer outputs an optical signal generating the phase difference.
9. The measurement system of claim 3, further comprising:
the display screen is connected with the signal processor and used for restoring a high-frequency transient magnetic field waveform according to the digital signal;
and the external memory interface is connected with the signal processor and is used for connecting an external memory for data output.
10. Measuring system according to claim 9, characterized in that
The first photoelectric conversion circuit, the second photoelectric conversion circuit, the signal processor, the synchronous trigger device, the display screen and the external memory interface are integrated on a PCB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920935018.9U CN210665997U (en) | 2019-06-20 | 2019-06-20 | Portable ultra-fast transient high-frequency magnetic field measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920935018.9U CN210665997U (en) | 2019-06-20 | 2019-06-20 | Portable ultra-fast transient high-frequency magnetic field measurement system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210665997U true CN210665997U (en) | 2020-06-02 |
Family
ID=70817321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920935018.9U Active CN210665997U (en) | 2019-06-20 | 2019-06-20 | Portable ultra-fast transient high-frequency magnetic field measurement system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210665997U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174628A (en) * | 2019-06-20 | 2019-08-27 | 贵州电网有限责任公司电力科学研究院 | A kind of portable very fast transient high frequency magnetic field measuring system |
-
2019
- 2019-06-20 CN CN201920935018.9U patent/CN210665997U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174628A (en) * | 2019-06-20 | 2019-08-27 | 贵州电网有限责任公司电力科学研究院 | A kind of portable very fast transient high frequency magnetic field measuring system |
| CN110174628B (en) * | 2019-06-20 | 2024-08-30 | 贵州电网有限责任公司电力科学研究院 | Portable ultra-fast transient high-frequency magnetic field measurement system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105425051A (en) | Broadband pulse electric field test probe | |
| CN110672931A (en) | Electromagnetic pulse radiation field test probe, test system and test method | |
| CN104459348A (en) | Software-defined radio based high-power microwave radiation field measuring device and method | |
| CN100412553C (en) | Detector of Radar peak value field strength | |
| CN2816825Y (en) | Microwave peak-field-density detector | |
| CN210665997U (en) | Portable ultra-fast transient high-frequency magnetic field measurement system | |
| CN210665892U (en) | Portable ultra-fast transient high-frequency electric field measurement system | |
| CN110174628B (en) | Portable ultra-fast transient high-frequency magnetic field measurement system | |
| CN104764928A (en) | Portable pulse large-current measurement device suitable for transformer substation sites | |
| CN105021901A (en) | High-voltage electric field measurement system and measurement method thereof | |
| CN205594118U (en) | Transmission line ground connection flashover fault positioning system | |
| CN204065246U (en) | A kind of three-dimensional electric field proving installation | |
| CN103326795B (en) | Method for broadband radio-frequency signal correlation detection based on time-spectrum convolution principle | |
| He et al. | Design of Nanosecond-level Transient Electric Field Sensor and its Application in HVDC Converter Station | |
| CN110133390A (en) | A kind of portable very fast transient high-frequency electric field measuring system | |
| CN102565745A (en) | Ultra high-frequency partial discharge sensor | |
| CN114325128A (en) | Integrated high-power microwave field intensity detector | |
| Kong et al. | An active e-field sensor based on laser diode for EMP measurement | |
| CN109991468A (en) | A kind of method and device for testing ultra-high voltage transformer station electrical secondary system disturbance voltage | |
| CN214067282U (en) | BCI anti-interference test system | |
| CN107390061A (en) | Using the test system of fiber optic communication electronic device false triggering under strong electromagnetic radiation | |
| CN113238086A (en) | GIS transient shell voltage on-line monitoring system based on optical voltage sensor | |
| TW200521450A (en) | Electromagnetic signal sensing system | |
| CN114062847A (en) | X-waveband large-dynamic high-power microwave radiation environment distribution parameter measuring device | |
| CN207586336U (en) | A kind of device of optocoupler time response detection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210511 Address after: 550002 No.17, Binhe Road, Guiyang City, Guizhou Province Patentee after: GUIZHOU POWER GRID Corp. Address before: 550002 No.86 Jiefang Road, Nanming District, Guiyang City, Guizhou Province Patentee before: ELECTRIC POWER RESEARCH INSTITUTE, GUIZHOU POWER GRID Co.,Ltd. |
|
| TR01 | Transfer of patent right |