CN105842595B - A kind of broadband scan-type cable local discharge measuring device - Google Patents
A kind of broadband scan-type cable local discharge measuring device Download PDFInfo
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- CN105842595B CN105842595B CN201610342303.0A CN201610342303A CN105842595B CN 105842595 B CN105842595 B CN 105842595B CN 201610342303 A CN201610342303 A CN 201610342303A CN 105842595 B CN105842595 B CN 105842595B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
Abstract
The invention discloses a kind of broadband scan-type cable local discharge measuring devices comprising wideband high frequency current sensor, signal condition unit and host computer；Signal condition unit and upper mechatronics, signal condition unit includes the casacade multi-amplifier, wave detector and digital oscilloscope being sequentially connected electrically；Casacade multi-amplifier is used to amplify the electric signal of wideband high frequency current sensor；The present invention can be preferably suitable for complicated test environment, be had higher detection result and practicability with the local discharge signal of the scanhead cable of Whole frequency band, strong antijamming capability.
Description
Technical field
The present invention relates to a kind of broadband scan-type cable local discharge measuring device and detection methods.
Background technology
Currently, 10kV or more Voltage Cable Lines Constructions have been widely used in urban distribution network, and substituted aerial transmission and distribution line
The trend on road, safe and reliable operation are related to the reliability of urban electricity supply.Relative to other high voltage electric equipments, cable insulation
The Precise Diagnosis difficulty bigger of failure.This be primarily due to cable be mounted on underground, distance it is very long, no matter tour, live detection,
Maintenance, diagnosis all take time and effort, and are not easy to implement；And it is different from miscellaneous equipment, cable body makes in factory, and cable connects
Head will be installed at the scene, and site operation quality is affected by many factors, and the quality control requirement in factory, cable may be not achieved
Connector often becomes the main spot of cable fault, and because of joint structure complexity, diagnosis difficulty is bigger.How these are realized
The status assessment of cable run and maintenance ensure cable run safe and reliable operation, are one of the hot spots studied at present.
Omen of the shelf depreciation as insulation degradation, is widely recognized as both at home and abroad.On high-tension cable, shelf depreciation with
Its insulation status is closely related, and the variation of partial discharge quantity implies cable insulation, and there may be endanger lacking for its operational safety
It falls into.Existing cable generally uses XLPE to insulate.Theoretically, the frequency spectrum that XLPE cable partial discharge pulse includes is very wide, and maximum reaches
To the GHz orders of magnitude, minimum reaches several kHz.There are many method, high-frequency current method is that current application is compared for cable local discharge detection
Successful method.High frequency measurement predominantly detects the local discharge signal within the scope of 3M-30MHz both at home and abroad at present.However frequency band is examined
The width of survey is narrow, and local discharge signal caused by some defects can be caused to be missed, such as hyperfrequency (being more than 100MHz) range
Or low frequency (being less than 200kHz) range.Therefore, the detection of partial discharge high-frequency signal is carried out within the scope of broad frequency band to study at present
Difficult point.
High Frequency Current Sensor (HFCT) detects the sensor element of shelf depreciation as high-frequency current detection method, generally makes
With Rogowski coil mode, multiturn conductive coil is surrounded on cricoid core material, high-frequency current draws across core center
The high-frequency alternating magnetic field risen can generate induced current in coil.The frequency bandwidth of High Frequency Current Sensor and sensitivity are to weigh
Most important two parameters of sensor performance.However, there is bandwidth in design and clever in existing High Frequency Current Sensor
Sensitivity is insufficient or high sensitivity and defect that frequency band is relatively narrow.
Invention content
The technical problem to be solved by the present invention is to provide a kind of broadband scan-type cable local discharge of reasonable design
Measuring device.
In order to solve the above technical problems, apparatus of the present invention adopt the technical scheme that：A kind of broadband scan-type cable office
Portion's discharge measuring device, including wideband high frequency current sensor, signal condition unit and host computer；
High Frequency Current Sensor is electrically connected by coaxial cable with signal condition unit, signal condition unit and upper electromechanics
Connection,
Signal condition unit includes the casacade multi-amplifier, wave detector and digital oscilloscope being sequentially connected electrically；
Casacade multi-amplifier is used to amplify the electric signal of wideband high frequency current sensor；
Wave detector is used for carrying out detection through the amplified electric signal of casacade multi-amplifier and passing to electric signal digital
Oscillograph,
Digital oscilloscope is used for electrical signal collection, digital imagery and passes to host computer.
Further, the High Frequency Current Sensor is the electromagnetic coupling open-close type current sensing based on Rogowski coil principle
Device.
Further, the High Frequency Current Sensor includes Metal shielding shell and sensor module；
The Metal shielding shell is made of two split type half boxes, and one end of two split type half boxes is hinged by hinge,
The other end is hinged by hasp；Two split type half boxes intermediate circular hole for forming an axial direction after being closed, outside is octagon；
Split type half box offers half ring-like magnetic core slot along its circumferencial direction, and thin lid is equipped with above the magnetic core slot
Plate；
The sensor module includes half ring type magnetic core being set in magnetic core slot, each half ring type magnetic core is wound with 3 circles
Different coils is counted, signal output port, each coil both ends point are respectively equipped on wherein 6 sides of the Metal shielding shell
It is not connected with corresponding signal output port；Insulating layer is filled in gap between the magnetic core slot and half ring type magnetic core.
Further, the magnetic core slot is half ring-like groove.
Further, the insulating layer is formed by poured with epoxy resin or by silica gel pad.
Further, half ring type magnetic core is nickel-zinc ferrite.
Further, 6 signal output ports correspond to 20K-1MHz, 1M-30MHz, 30-100MHZ, 100M- respectively
The detection frequency band of 200MHz, 200M-500MHz, 500M-700MHz.
Further, digital oscilloscope includes three PicoScope 2208As in parallel with wave detector；Each
PicoScope 2208A have 2 data acquisition channels, frequency bandwidth 200MHz, continuous sampling mode down-sampling rate to be
1GS/s。
A kind of full band scan formula detection method for local discharge of the present invention, by means of above-mentioned broadband scan-type cable office
Portion's discharge measuring device；Specifically comprise the following steps：
A, the broad-band sensor is installed on the cross interconnected line of cable termination ground wire or cable intermediate joint,
6 signal output ports of High Frequency Current Sensor are separately connected with 6 channels of the signal condition unit respectively, to
One test point is detected；
B, PC control signal condition unit successively to 6 Air conduct measurements to signal handle, multistage amplification
Device carries out multistage amplification to the signal that broad-band sensor detects first, and amplified signal is transferred to digital through detection
Oscillograph, digital oscilloscope high speed acquisition signal, and connect with host computer by USB data line；
Amplification, detection and data acquisition, and collected signal is analyzed, handled and stored；To avoid sensor 6
The mutual inductance of a signal output, is only acquired and handles to the signal of 1 port every time；
C, after completing the full band scan formula detection to 6 channels, host computer is compared the signal of acquisition, analyzes,
Judge the most suitable frequency band of cable local discharge measurement point and the frequency band there may be local discharge signal；
D, the signal of most suitable frequency band is exported and carries out emphasis monitoring and judgement；
E, the second test point of detection is replaced, repeat the above steps a-d, is then compared and analyzed with the first test point.
The software that wherein host computer uses programs data progress noise reduction, the threshold realized and acquired to oscillograph based on LabVIEW
Value judges and smoothing processing；The software can also realize that the signal to multiple power frequency periods counts, and obtains shelf depreciation
Phase collection of illustrative plates and three-dimensional collection of illustrative plates.
This High Frequency Current Sensor at work, around hinged hinge open, and shielding box is placed on by two split type half boxes
On earth cable, hinge is closed, fastening hasp is to be closed metal shielding box.Faint high-frequency current signal is in magnetic core in cable
Induction generates the magnetic field of respective change, which incudes the voltage for generating respective change, the induced voltage in coil
It is exported through signal output port.By detecting the induced voltage of unlike signal output port respectively, EHF band model can be detected
Enclose the local discharge signal in interior high-tension cable.
It is using advantageous effect caused by above-mentioned technical proposal：
When shelf depreciation occurs for cable, broadband current sensor detects discharge signal, partial discharge intensity is different,
Point of discharge is different apart from test point distance, and the frequency range of high-frequency current signal also has great difference therewith；
The broad-band sensor of multi output port provided by the invention can be believed with the shelf depreciation of the scanhead cable of Whole frequency band
Number, it is designed as a result of frequency-division section, ensure that each frequency range has higher sensitivity.Therefore, dress provided by the invention
Strong antijamming capability is set, the shelf depreciation high-frequency current signal for the varying strength that different location transmits can be obtained completely, is avoided existing
There is high-frequency method to measure the phenomenon that cable local discharge is often failed to judge.Moreover, provided by the invention based on full band scan
Detection method for local discharge can preferably be suitable for complicated test compared to the methods of existing distributed Partial Discharge Detection
Environment has higher detection result and practicability.
Description of the drawings
The circuit block diagram of Fig. 1 present invention
Fig. 2 is the structural schematic diagram of High Frequency Current Sensor of the present invention
Fig. 3 is the half-sectional left view of High Frequency Current Sensor of the present invention
Fig. 4 is the equivalent circuit of High Frequency Current Sensor of the present invention
Specific implementation mode
The present invention is further detailed with reference to the accompanying drawings and detailed description.
As shown in Figs 1-4, the present invention includes wideband high frequency current sensor, signal condition unit and host computer；
High Frequency Current Sensor is electrically connected by coaxial cable with signal condition unit, signal condition unit and upper electromechanics
Connection,
Signal condition unit includes the casacade multi-amplifier, wave detector and digital oscilloscope being sequentially connected electrically；
Casacade multi-amplifier is used to amplify the electric signal of wideband high frequency current sensor；
Wave detector is used for carrying out detection through the amplified electric signal of casacade multi-amplifier and passing to electric signal digital
Oscillograph,
Digital oscilloscope is used for electrical signal collection, digital imagery and passes to host computer.
High Frequency Current Sensor is the electromagnetic coupling open-close type current sensor based on Rogowski coil principle.
High Frequency Current Sensor includes Metal shielding shell and sensor module；
Metal shielding shell is made of two split type half boxes 1, and one end of two split type half boxes 1 is hinged by hinge 5, separately
One end is hinged by hasp 6；Two split type half boxes 1 intermediate circular hole 12 for forming an axial direction after being closed, outside are positive eight side
Shape；
Split type half box 1 offers half ring-like magnetic core slot 2 along its circumferencial direction, and magnetic core slot 2 is equipped with thin cover board 3 above；
Magnetic core slot 2 and thin cover board 3 are fixed by several installation screw holes 7 with installing screw connection；The both ends of magnetic core slot 2 are respectively equipped with one
Location hole 10 and a locating pin 11 realize rationally accurately positioning；
Sensor module includes half ring type magnetic core 8 being set in magnetic core slot 2, and two semi-circular magnetic cores 8 are spliced into a ring
Shape magnetic core, each half ring type magnetic core 8 are wound with 3 the number of turns difference winding wires diameters also different coil, Metal shielding shell
Wherein 6 sides on be respectively equipped with signal output port 4, each coil both ends are connected with corresponding signal output port 4 respectively；
Insulating layer is filled in gap 9 between magnetic core slot 8 and half ring type magnetic core 8.
Magnetic core slot 8 is half ring-like groove.Insulating layer is formed by poured with epoxy resin or by silica gel pad.Half ring type magnetic core
8 be nickel-zinc ferrite.
6 signal output ports 4 correspond to 20K-1MHz, 1M-30MHz, 30-100MHZ, 100M-200MHz, 200M- respectively
The detection frequency band of 500MHz, 500M-700MHz.Due to each frequency range relative narrower, it is ensured that in the frequency range
Sensitivity.
Digital oscilloscope includes three PicoScope 2208As in parallel with wave detector；Each PicoScope 2208A
It is 1GS/s to have 2 data acquisition channels, frequency bandwidth 200MHz, continuous sampling mode down-sampling rate.
The full band scan formula detection method for local discharge of the present embodiment, specifically comprises the following steps：
A, broad-band sensor is installed on the cross interconnected line of cable termination ground wire or cable intermediate joint, it will be high
6 signal output ports of frequency current sensor are separately connected with 6 channels of signal condition unit respectively, to the first test point
It is detected；
B, PC control signal condition unit successively to 6 Air conduct measurements to signal handle, multistage amplification
Device carries out multistage amplification to the signal that broad-band sensor detects first, and amplified signal is transferred to digital through detection
Oscillograph, digital oscilloscope high speed acquisition signal, and connect with host computer by USB data line；
Amplification, detection and data acquisition, and collected signal is analyzed, handled and stored；To avoid sensor 6
The mutual inductance of a signal output, is only acquired and handles to the signal of 1 port every time；
C, after completing the full band scan formula detection to 6 channels, host computer is compared the signal of acquisition, analyzes,
Judge the most suitable frequency band of cable local discharge measurement point and the frequency band there may be local discharge signal；
D, the signal of most suitable frequency band is exported and carries out emphasis monitoring and judgement；
E, the second test point of detection is replaced, repeat the above steps a-d, is then compared and analyzed with the first test point.
Wherein when in use, sensor hasp 6 is opened for High Frequency Current Sensor, is sleeved on the terminal ground wire of tested cable
On；The signal that 6 signal output ports 4 export is consecutively connected to letter by the coaxial cable for being 20-100 ohm using characteristic impedance
In number measuring device.The frequency range of different Port detectings is different, and 6 signal output ports can be with detection span 20K-
The high-frequency current signal of this pole broad frequency range of 700MHz.The unique design of High Frequency Current Sensor described in the present embodiment,
It can ensure that each frequency band all has high sensitivity.After core material and core cross section product are fixed, frequency bandwidth is detected
The number of turns is mainly wound with coil and coil diameter, material and insulation are directly related.
Typical current sensor equivalent circuit is as shown in figure 4, it is similar to high frequency small-signal shunt-resonant circuit.Wherein
I1 (t) is primary current, and U1 (t) is the induced voltage of coil, and M is the mutual inductance of primary side and secondary side, and Ls is self-induction of loop, and Rs is line
Self-resistance is enclosed, Cs is stray capacitance, and R is load resistance.Using high frequency small-signal shunt-resonant circuit theory analysis, can obtain electric
The frequency band of flow sensor is
Lower frequency limit：
Upper limiting frequency：
Working band width：
Sensitivity：
The bandwidth B and sensitivity K of High Frequency Current Sensor are by the self-induction Ls of coil, self-resistance Rs, stray capacitance Cs, mutually
Feel M and load resistance R is codetermined.By 1-4 formulas it is found that improve sensor bandwidth it is necessary to keep f2 as big as possible, f1 is as far as possible
It is small.If improving self-induction of loop Ls, lower-cut-off frequency f1 will be reduced；Equally, if reduce coil stray capacitance Cs and
Self-resistance Rs just will increase upper cut-off frequency f2, and two ways can all expand bandwidth, but all so that under transducer sensitivity
Drop；When load resistance R reduces, lower-cut-off frequency f1 is reduced, and upper cut-off frequency f2 increases, i.e., working band broadens, but
With the reduction of R, the sensitivity of sensor also declines therewith.As it can be seen that should ensure that sensor has sufficiently high sensitivity, again
Ensure it to have wider frequency band to be difficult to realize.
These parameters of Ls, Cs and Rs of coil are decided by the internal-and external diameter of magnetic core, height, coil turn, the length of coil itself
Degree and sectional area (5-7 formulas).Wherein N is coil turn, and A is the sectional area of magnetic core, and l is the average length of magnetic circuit, and μ is initial magnetic
Conductance, ε are the dielectric constant of coil insulation, and r2 and r1 are respectively the outer diameter and internal diameter of magnetic core；ρ, L and S are respectively used in coil
Resistivity, total length and the sectional area of conducting wire.
Self-induction of loop：
Coil stray capacitance：
Coil resistance：
By 5-7 formulas and the analysis of front is combined, in order to make the bandwidth of sensor, to need to select magnetic about frequency bandwidth
The big magnetic core of conductance increases coil and winds the number of turns and core cross section product, reduces the length of magnetic path so that self-induction of loop increases；Pass through increasing
Add loop length and sectional area to reduce coil resistance Rs；It is spuious to reduce coil by increasing core diameter and internal-and external diameter difference
Capacitance Cs.It is directly proportional to load resistance R according to analysis level of sensitivity about sensitivity, it is inversely proportional with turn number N.
Thus there is contradiction, that is, reduces load resistance, can be with broadband, but sensitivity can be reduced, increase number of turns
Sensitivity can be equally reduced with broadband.
By theoretical calculation and verification experimental verification, sensor core material is nickel-zinc ferrite, magnetic core size in the present embodiment
For 50 × 80 × 20mm, 6 frequency band coil features are respectively：
Frequency band 1 (10K-1M)：Wire material is the bifilar copper conductors of a diameter of 1mm, and number of turns is 10 circles, integrating resistor
50Ω；
Frequency band 2 (1M-30M)：Wire material is the bifilar copper conductors of a diameter of 1mm, and number of turns is 10 circles, integrating resistor
100Ω；
Frequency band 1 (30M-100M)：Wire material is the bifilar copper conductors of a diameter of 1mm, and number of turns is 10 circles, integral electricity
Hinder 1k Ω；
Frequency band 2 (100M-300M)：Wire material is the copper conductor of a diameter of 1mm, and number of turns is 10 circles, integrating resistor
10kΩ；
Frequency band 1 (300M-500M)：Wire material is the copper conductor of a diameter of 0.8mm, and number of turns is 20 circles, integral electricity
Hinder 20k Ω；
Frequency band 2 (500M-700M)：Wire material is the copper conductor of a diameter of 0.5mm, and number of turns is 25 circles, integral electricity
Hinder 25k Ω；
There are variable connector, upper computer software control to put between output port between casacade multi-amplifier and broad-band sensor
Big device measures every time only to be connect with 1 sensor output mouth, can be generated Current Mutual Inductance to avoid between 6 coils in this way, be made
At test error.
When specifically used：By broad-band sensor be installed on cable termination ground wire or cable intermediate joint it is cross interconnected
On line, 6 signal output ports of sensor are separately connected with 6 channels of signal condition unit respectively；Signal condition list
Member is connect with host computer.Upper computer software is opened, signal condition unit and host computer communication, upper computer software control amplification are established
Variable connector between device and sensor is sequentially connected 6 channels and is detected, software analyzes collected signal,
Processing and storage；After completing the full band scan formula detection to 6 channels, the signal of acquisition is compared in upper computer software,
Analysis, judges the most suitable frequency band of cable local discharge measurement point and the frequency band there may be local discharge signal；Subsequent software is automatic
Sensor signal output port where the most suitable frequency band of connection, exports the signal and carries out emphasis monitoring；Believe to several power frequencies
After local discharge signal is for statistical analysis in number, the phase collection of illustrative plates and real-time three-dimensional electric discharge collection of illustrative plates of the shelf depreciation are shown, and
Judge the position of shelf depreciation；To there may be the frequency bands of local discharge signal, sensing station is manually replaced, front is repeated
Determination step, to further confirm that whether the shelf depreciation derives from another location.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
To modify to the technical solution recorded in previous embodiment or equivalent replacement of some of the technical features；Make
It is obvious to be combined to multiple technical solutions of the present invention for those skilled in the art.And these are changed or replace
It changes, the spirit and scope for technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (7)
1. a kind of broadband scan-type cable local discharge measuring device, it is characterised in that：It is sensed including wideband high frequency current
Device, signal condition unit and host computer；
High Frequency Current Sensor is electrically connected by coaxial cable with signal condition unit, and signal condition unit is electrically connected with host computer
It connects,
Signal condition unit includes the casacade multi-amplifier, wave detector and digital oscilloscope being sequentially connected electrically；
Casacade multi-amplifier is used to amplify the electric signal of wideband high frequency current sensor；
Wave detector is used to that carrying out detection through the amplified electric signal of casacade multi-amplifier and electric signal to be passed to digital oscillography
Device,
Digital oscilloscope is used for electrical signal collection, digital imagery and passes to host computer；
The High Frequency Current Sensor includes Metal shielding shell and sensor module；
The Metal shielding shell is by two split type half boxes（1）It constitutes, two split type half boxes（1）One end by hinge（5）
Hinged, the other end passes through hasp（6）It is hinged；Two split type half boxes（1）The intermediate circular hole for forming an axial direction after closure（12）,
Outside is octagon；
Split type half box（1）Half ring-like magnetic core slot is offered along its circumferencial direction（2）, the magnetic core slot（2）It sets above
There is thin cover board（3）；
The sensor module includes being set to magnetic core slot（2）Half interior ring type magnetic core（8）, each half ring type magnetic core（8）It is wound with 3
A the number of turns different coil is respectively equipped with signal output port on wherein 6 sides of the Metal shielding shell（4）, each line
Enclose both ends respectively with corresponding signal output port（4）Connection；The magnetic core slot（2）With half ring type magnetic core（8）Between gap
（9）It is interior to be filled with insulating layer.
2. a kind of broadband scan-type cable local discharge measuring device according to claim 1, it is characterised in that：Institute
It is the electromagnetic coupling open-close type current sensor based on Rogowski coil principle to state High Frequency Current Sensor.
3. a kind of broadband scan-type cable local discharge measuring device according to claim 1, it is characterised in that：Institute
State magnetic core slot（2）For half ring-like groove.
4. a kind of broadband scan-type cable local discharge measuring device according to claim 1, it is characterised in that：Institute
Insulating layer is stated to form by poured with epoxy resin or by silica gel pad.
5. a kind of broadband scan-type cable local discharge measuring device according to claim 1, it is characterised in that：Institute
State half ring type magnetic core（8）For nickel-zinc ferrite.
6. according to a kind of broadband scan-type cable local discharge measuring device of claim 1-5 any one of them, feature
It is：6 signal output ports（4）20K-1MHz, 1M-30MHz, 30 M -100MHz, 100M- are corresponded to respectively
The detection frequency band of 200MHz, 200M-500MHz, 500M-700MHz.
7. a kind of broadband scan-type cable local discharge measuring device according to claim 1, it is characterised in that：Number
Word formula oscillograph includes three PicoScope 2208As in parallel with wave detector；Each PicoScope 2208A have 2 data
Acquisition channel, frequency bandwidth 200MHz, continuous sampling mode down-sampling rate are 1GS/s.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106291063A (en) * | 2016-08-31 | 2017-01-04 | 北京兴泰学成仪器有限公司 | High frequency current sensor |
| CN106249116A (en) * | 2016-08-31 | 2016-12-21 | 北京兴泰学成仪器有限公司 | High Frequency Current Sensor |
| CN107167714A (en) * | 2017-06-13 | 2017-09-15 | 珠海市脉迅科技有限公司 | A kind of low current synchronous signal sensor device |
| CN110376495A (en) * | 2019-07-24 | 2019-10-25 | 全球能源互联网研究院有限公司 | A kind of partial discharge detecting sensor and its manufacturing method |
| CN111239566A (en) * | 2020-03-02 | 2020-06-05 | 西南交通大学 | High-sensitivity high-frequency pulse current sensor |
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