CN105842595A - Broadband scanning-type cable partial discharge measurement device - Google Patents
Broadband scanning-type cable partial discharge measurement device Download PDFInfo
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- CN105842595A CN105842595A CN201610342303.0A CN201610342303A CN105842595A CN 105842595 A CN105842595 A CN 105842595A CN 201610342303 A CN201610342303 A CN 201610342303A CN 105842595 A CN105842595 A CN 105842595A
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- magnetic core
- current sensor
- discharge measurement
- local discharge
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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 broadband scanning-type cable partial discharge measurement device, which comprises a broadband high-frequency current sensor, a signal conditioning unit and an upper computer. The signal conditioning unit is electrically connected with the upper computer. The signal conditioning unit comprises a multiple-stage amplifier, a demodulator and a digital oscilloscope, which are electrically connected in sequence, wherein the multiple-stage amplifier is used for amplifying electrical signals of the broadband high-frequency current sensor. The device can scan partial discharge signals of a cable in a full band manner, is high in anti-interference capability, can be suitable for complex test environment better and has better detection effect and practicability.
Description
Technical field
The present invention relates to a kind of broadband scan-type cable local discharge measurement apparatus and detection method.
Background technology
At present, more than 10kV Voltage Cable Lines Construction has been widely used in urban distribution network, and substituted built on stilts transmission & distribution
The trend of electric line, its safe and reliable operation is related to the reliability of urban electricity supply.Relative to other high-voltage electrical apparatus
Equipment, the Precise Diagnosis difficulty of cable insulation fault is bigger.This is primarily due to cable and is arranged on underground, distance
The longest, no matter tour, live detection, overhauling, diagnosing and all take time and effort, it is difficult to implement；And set with other
Standby different, cable body makes in factory, and cable connector to be installed at the scene, and site operation quality is by many
The impact of the factor of kind, may not reach the quality control requirement in factory, and cable connector often becomes cable fault
Main spot, because joint design is complicated, its diagnosis difficulty is bigger.How to realize the shape of these cable runs
State assessment and maintenance, ensure cable run safe and reliable operation, is one of current focus studied.
Shelf depreciation, as the omen of insulation degradation, is widely recognized as both at home and abroad.On high tension cable, locally
It is closely related that electric discharge is insulated from situation, and the change of partial discharge quantity imply that cable insulation there may be and endangers it
Run the defect of safety.Existing cable typically uses XLPE to insulate.In theory, XLPE cable shelf depreciation arteries and veins
The frequency spectrum that punching comprises is the widest, and the up to GHz order of magnitude, minimum reaches several kHz.Cable local discharge detects
Having multiple method, high frequency electric method is the successful method of current Application comparison.High frequency measurement is main the most both at home and abroad
Local discharge signal in the range of detection 3M-30MHz.But the width of frequency band detection is narrow, can cause
The local discharge signal that defect causes is missed, as hyperfrequency (more than 100MHz) scope or low frequency (are less than
200kHz) scope.Therefore, in the range of broad frequency band, carry out office put the difficulty that high-frequency signal detection is research at present
Point.
High Frequency Current Sensor (HFCT) detects the sensor element of shelf depreciation as high frequency electric detection method,
Generally use Rogowski coil mode, around multiturn conductive coil, high-frequency electrical on ring-type core material
Flow through the high-frequency alternating magnetic field that core center causes and can produce faradic current in coil.High Frequency Current Sensor
Bandwidth and sensitivity be weigh sensor performance most important two parameters.But, existing high frequency
Current sensor there is bandwidth in design and sensitivity is not enough or highly sensitive and that frequency band is narrower defect.
Summary of the invention
The technical problem to be solved in the present invention is to provide for a kind of broadband scan-type cable local reasonable in design
Discharge measuring device.
For solving above-mentioned technical problem, apparatus of the present invention adopt the technical scheme that: a kind of broadband scan-type electricity
Cable partial-discharge measuring device, including wideband high frequency current sensor, signal condition unit and host computer；
High Frequency Current Sensor is electrically connected with signal condition unit by coaxial cable, and signal condition unit is with upper
Mechatronics,
Signal condition unit includes multistage amplifier, cymoscope and the digital oscilloscope being sequentially connected electrically；
Multistage amplifier is for amplifying the signal of telecommunication of wideband high frequency current sensor；
Cymoscope for carrying out detection and the signal of telecommunication passing to number to the signal of telecommunication after multistage amplifier amplifies
Word formula oscillograph,
Digital oscilloscope is used for electrical signal collection, digital image and passes to host computer.
Further, described High Frequency Current Sensor is electromagnetic coupled open-close type current based on Luo-coil principle
Sensor.
Further, described High Frequency Current Sensor includes Metal shielding shell and sensor cluster；
Described Metal shielding shell is made up of two split type half boxes, and one end of two split type half boxes is cut with scissors by hinge
Connecing, the other end is hinged by hasp；One axial circular hole of intermediate formation after two split type half box Guan Bis, outward
Side is octagon；
Described split type half box offers half ring-like magnetic core groove along its circumferencial direction, and described magnetic core groove is arranged above with
Thin cover plate；
Described sensor cluster includes half ring type magnetic core being located in magnetic core groove, and each half ring type magnetic core is wound with 3
The coil that the individual number of turn is different, wherein 6 limits of described Metal shielding shell are respectively equipped with signal output port,
Each coil two ends connect with corresponding signal output port respectively；Between described magnetic core groove and half ring type magnetic core
Insulating barrier it is filled with in gap.
Further, described magnetic core groove is half ring-like groove.
Further, described insulating barrier forms by poured with epoxy resin or by silica gel pad.
Further, described half ring type magnetic core is nickel-zinc ferrite.
Further, 6 described signal output ports the most corresponding 20K-1MHz, 1M-30MHz, 30-100MHZ,
The detection frequency band of 100M-200MHz, 200M-500MHz, 500M-700MHz.
Further, digital oscilloscope includes three PicoScope 2208As in parallel with cymoscope；Each
PicoScope 2208A has 2 data acquisition channels, and its bandwidth is 200MHz, under continuous sampling mode
Sample rate is 1GS/s.
One full band scan formula detection method for local discharge of the present invention, by means of above-mentioned broadband scan-type electricity
Cable partial-discharge measuring device；Specifically include following steps:
A, described broad-band sensor is installed on the cross interconnected of cable termination earth lead or cable intermediate joint
On line, the 6 of High Frequency Current Sensor signal output ports are logical with 6 of described signal condition unit respectively
Road connects respectively, detects the first test point；
B, PC control signal condition unit successively to 6 Air conduct measurement to signal process, many
The signal that first broad-band sensor is detected by level amplifier carries out multistage amplification, and the signal after amplification is through inspection
Ripple, is transferred to digital oscilloscope, digital oscilloscope high speed acquisition signal, and passes through USB data line with upper
Position machine connects；
Amplification, detection and data acquisition, and the signal collected is analyzed, processes and stores；For avoiding
The mutual inductance of 6 signal outputs of sensor, is the most only acquired the signal of 1 port and processes；
C, complete the full band scan formula to 6 passages detection after, host computer to obtain signal compare,
Analyze, it is judged that cable local discharge is measured the suitableeest frequency band of point and there may be the frequency band of local discharge signal；
D, the signal of the suitableeest frequency band is exported carry out emphasis monitoring and judgement；
E, replacing detection the second test point, repeat the above steps a-d, then contrast with the first test point
Analyze.
The data of oscillograph collection are dropped by the software that wherein host computer uses based on LabVIEW programming realization
Make an uproar, threshold decision and smoothing processing；This software can also realize adding up the signal of multiple power frequency periods,
Obtain the phase place collection of illustrative plates of shelf depreciation and three-dimensional collection of illustrative plates.
This High Frequency Current Sensor operationally, open around hinged hinge, by shielding box by two split type half boxes
Being placed on earth cable, close hinge, buckles hasp to close metal shielding box.High-frequency electrical faint in cable
Stream signal senses the magnetic field generating respective change in magnetic core, and it is corresponding that the magnetic field of this change senses generation in coil
The voltage of change, this induced voltage exports through signal output port.By detecting unlike signal output port respectively
Induced voltage, the local discharge signal in high tension cable in the range of EHF band can be detected.
Use and have the beneficial effects that produced by technique scheme:
When cable generation shelf depreciation, broadband current sensor detects discharge signal, partial discharge intensity
Different, point of discharge distance test point distance difference, the frequency range of high-frequency current signal exists the most therewith greatly
Difference；
The broad-band sensor of the multi output port that the present invention provides, can put with the local of the scanhead cable of Whole frequency band
The signal of telecommunication, owing to have employed frequency-division section design, it is ensured that each frequency range has higher sensitivity.Therefore,
The device capacity of resisting disturbance that the present invention provides is strong, and the local that can obtain the varying strength that diverse location transmits completely is put
Electricity high-frequency current signal, it is to avoid existing high-frequency method measures the phenomenon that failing to judge often occurs in cable local discharge.And,
The detection method for local discharge based on full band scan that the present invention provides, compares existing distributed shelf depreciation
The methods such as detection, can preferably be applicable to the test environment of complexity, have higher Detection results and practicality.
Accompanying drawing explanation
The circuit block diagram of Fig. 1 present invention
Fig. 2 is the structural representation of High Frequency Current Sensor of the present invention
Fig. 3 is that High Frequency Current Sensor of the present invention partly cuts open left view
Fig. 4 is the equivalent circuit of High Frequency Current Sensor of the present invention
Detailed description of the invention
With detailed description of the invention, the present invention is further detailed below in conjunction with the accompanying drawings.
As Figure 1-4, the present invention includes wideband high frequency current sensor, signal condition unit and upper
Machine；
High Frequency Current Sensor is electrically connected with signal condition unit by coaxial cable, and signal condition unit is with upper
Mechatronics,
Signal condition unit includes multistage amplifier, cymoscope and the digital oscilloscope being sequentially connected electrically；
Multistage amplifier is for amplifying the signal of telecommunication of wideband high frequency current sensor；
Cymoscope for carrying out detection and the signal of telecommunication passing to number to the signal of telecommunication after multistage amplifier amplifies
Word formula oscillograph,
Digital oscilloscope is used for electrical signal collection, digital image and passes to host computer.
High Frequency Current Sensor is electromagnetic coupled open-close type current sensor based on Luo-coil principle.
High Frequency Current Sensor includes Metal shielding shell and sensor cluster；
Metal shielding shell is made up of two split type half boxes 1, and one end of two split type half boxes 1 is by hinge 5
Hinged, the other end is hinged by hasp 6；One axial circle of intermediate formation after two split type half box 1 Guan Bis
Hole 12, outside is octagon；
Split type half box 1 offers half ring-like magnetic core groove 2 along its circumferencial direction, and magnetic core groove 2 is arranged above with thin
Cover plate 3；Magnetic core groove 2 and thin cover plate 3 connect fixing by several installation screw holes 7 to install screw；Magnetic core
Groove 2 be respectively arranged at two ends with a hole, location 10 and a locating pin 11 realizes rationally positioning accurately；
Sensor cluster includes half ring type magnetic core 8 being located in magnetic core groove 2, and two semi-circular magnetic cores 8 are spliced into
One ring-shaped magnetic core, each half ring type magnetic core 8 is wound with 3 the most different lines of number of turn difference winding wires diameter
Circle, wherein 6 limits of Metal shielding shell are respectively equipped with signal output port 4, and each coil two ends are respectively
Connect with corresponding signal output port 4；It is filled with in gap 9 between magnetic core groove 8 and half ring type magnetic core 8
Insulating barrier.
Magnetic core groove 8 is half ring-like groove.Insulating barrier forms by poured with epoxy resin or by silica gel pad.Semi-ring
Type magnetic core 8 is nickel-zinc ferrite.
6 signal output ports 4 the most corresponding 20K-1MHz, 1M-30MHz, 30-100MHZ, 100M-200MHz,
The detection frequency band of 200M-500MHz, 500M-700MHz.Due to each frequency band range relative narrower, Ke Yibao
Demonstrate,prove the sensitivity in this frequency band range.
Digital oscilloscope includes three PicoScope 2208As in parallel with cymoscope；Each PicoScope
2208A has 2 data acquisition channels, and its bandwidth is 200MHz, and continuous sampling mode down-sampling rate is
1GS/s。
The full band scan formula detection method for local discharge of the present embodiment, specifically includes following steps:
A, broad-band sensor is installed on the cross interconnected line of cable termination earth lead or cable intermediate joint,
By the 6 of High Frequency Current Sensor signal output ports, 6 passages with signal condition unit connect respectively respectively
Connect, the first test point is detected；
B, PC control signal condition unit successively to 6 Air conduct measurement to signal process, many
The signal that first broad-band sensor is detected by level amplifier carries out multistage amplification, and the signal after amplification is through inspection
Ripple, is transferred to digital oscilloscope, digital oscilloscope high speed acquisition signal, and passes through USB data line with upper
Position machine connects；
Amplification, detection and data acquisition, and the signal collected is analyzed, processes and stores；For avoiding
The mutual inductance of 6 signal outputs of sensor, is the most only acquired the signal of 1 port and processes；
C, complete the full band scan formula to 6 passages detection after, host computer to obtain signal compare,
Analyze, it is judged that cable local discharge is measured the suitableeest frequency band of point and there may be the frequency band of local discharge signal；
D, the signal of the suitableeest frequency band is exported carry out emphasis monitoring and judgement；
E, replacing detection the second test point, repeat the above steps a-d, then carry out score with the first test point
Analysis.
Wherein High Frequency Current Sensor is in use, is opened by sensor hasp 6, is enclosed within the terminal of tested cable
On earth lead；The coaxial cable that characteristic impedance is 20-100 ohm is utilized to be exported by 6 signal output ports 4
Signal be consecutively connected on signal measurement apparatus.The frequency band range of different Port detectings is different, 6 signals
Output port can be with the high-frequency current signal of this pole broad frequency range of detection span 20K-700MHz.This enforcement
The design that High Frequency Current Sensor described in example is unique, it is ensured that each frequency band is respectively provided with high sensitivity.
After core material and core cross section amass and fix, detection bandwidth is mainly wound around the number of turn with coil and coil is straight
Footpath, material and insulation are directly related.
As shown in Figure 4, it is similar to high frequency small-signal shunt-resonant circuit to typical current sensor equivalent circuit.
Wherein I1 (t) is primary current, and U1 (t) is the induced voltage of coil, and M is former limit and the mutual inductance on time limit, Ls
For self-induction of loop, Rs is coil self-resistance, and Cs is stray capacitance, and R is load resistance.Employing high frequency is little
Signal shunt-resonant circuit theory analysis, the frequency band that can obtain current sensor is
Lower frequency limit:
Upper limiting frequency:
Working band width:
Sensitivity:
The bandwidth B of High Frequency Current Sensor and sensitivity K by self-induction Ls of coil, self-resistance Rs, spuious
Electric capacity Cs, mutual inductance M and load resistance R together decide on.From 1-4 formula, sensor bandwidth to be improved,
F2 will be made big as far as possible, and f1 is the least.If improving self-induction of loop Ls, low cutoff frequency will be reduced
Rate f1；Equally, if reducing stray capacitance Cs and the self-resistance Rs of coil, higher cut-off frequency will be increased
Rate f2, two ways all can expand bandwidth, but all make transducer sensitivity decline；When load resistance R subtracts
Hour, lower-cut-off frequency f1 reduces, and upper cut-off frequency f2 increases, i.e. working band broadens, but along with
The reduction of R, the sensitivity of sensor declines the most therewith.Visible, should ensure that sensor has sufficiently high sensitive
Degree, ensures that it has wider frequency band to be difficulty with again.
These parameters of Ls, Cs and Rs of coil are decided by the internal-and external diameter, highly of magnetic core, coil turn, coil
The length of itself and sectional area (5-7 formula).Wherein N is coil turn, and A is the sectional area of magnetic core, and l is magnetic
The average length on road, μ is initial permeability, and ε is the dielectric constant of coil insulation, r2 and r1 is respectively magnetic
The external diameter of core and internal diameter；ρ, L and S are respectively the resistivity of wire used by coil, total length and sectional area.
Self-induction of loop:
Coil stray capacitance:
Coil resistance:
By 5-7 formula combination analysis above, about bandwidth, in order to make the bandwidth of sensor, need
Select the big magnetic core of pcrmeability, increase coil and be wound around the number of turn and core cross section amasss, reduce the length of magnetic path so that coil
Self-induction increases；Coil resistance Rs is reduced by increasing loop length and sectional area；By increasing core diameter
Coil stray capacitance Cs is reduced with internal-and external diameter difference.About sensitivity, understand level of sensitivity according to analyzing
It is directly proportional to load resistance R, is inversely proportional to turn number N.Thus there is contradiction, i.e. reduce load electricity
Resistance, with broadband, but can reduce sensitivity, increase number of turns can also broadband, equally can
Reduce sensitivity.
Through Theoretical Calculation and verification experimental verification, in the present embodiment, sensor core material is nickel-zinc ferrite, magnetic core
A size of 50 × 80 × 20mm, 6 frequency band coil features are respectively as follows:
Frequency band 1 (10K-1M): wire material is the copper conductor that a diameter of 1mm is bifilar, number of turns is 10 circles,
Integrating resistor 50 Ω；
Frequency band 2 (1M-30M): wire material is the copper conductor that a diameter of 1mm is bifilar, number of turns is 10 circles,
Integrating resistor 100 Ω；
Frequency band 1 (30M-100M): wire material is the copper conductor that a diameter of 1mm is bifilar, number of turns is 10
Circle, integrating resistor 1k Ω；
Frequency band 2 (100M-300M): wire material is the copper conductor of a diameter of 1mm, number of turns is 10 circles,
Integrating resistor 10k Ω；
Frequency band 1 (300M-500M): wire material is the copper conductor of a diameter of 0.8mm, number of turns is 20
Circle, integrating resistor 20k Ω；
Frequency band 2 (500M-700M): wire material is the copper conductor of a diameter of 0.5mm, number of turns is 25
Circle, integrating resistor 25k Ω；
Variable connector, upper computer software control is had between output port between multistage amplifier and broad-band sensor
Amplifier processed is measured every time and is only connected with 1 sensor output mouth, so can avoid producing between 6 coils
Raw Current Mutual Inductance, causes test error.
Time specifically used: broad-band sensor is installed on the intersection of cable termination earth lead or cable intermediate joint
On interconnection line, by the 6 of sensor signal output ports, 6 passages with signal condition unit connect respectively respectively
Connect；Signal condition unit is connected with host computer.Open upper computer software, set up signal condition unit and host computer
Communication, upper computer software controls the variable connector between amplifier and sensor, is sequentially connected with 6 passages and carries out
Detection, the signal collected is analyzed, processes and stores by software；Complete the Whole frequency band of 6 passages is swept
After retouching formula detection, the signal obtained is compared, is analyzed by upper computer software, it is judged that cable local discharge is measured
Put the suitableeest frequency band and there may be the frequency band of local discharge signal；Software is from being dynamically connected the suitableeest frequency band place subsequently
Sensor signal output port, carries out emphasis monitoring to the output of this signal；In to several power frequency components, local is put
After the signal of telecommunication carries out statistical analysis, show phase place collection of illustrative plates and the real-time three-dimensional electric discharge collection of illustrative plates of this shelf depreciation, and sentence
Determine the position of shelf depreciation；To there may be the frequency band of local discharge signal, manually change sensing station, weight
Multiple determination step above, to further confirm that whether this shelf depreciation derives from another location.
Last it is noted that above example is only in order to illustrate technical scheme, rather than it is limited
System；Although being described in detail the present invention with reference to previous embodiment, those of ordinary skill in the art should
Work as understanding: the technical scheme described in previous embodiment still can be modified by it, or to wherein part
Technical characteristic carries out equivalent；As those skilled in the art, multiple technical schemes of the present invention are combined
It is apparent from.And these amendments or replacement, do not make the essence of appropriate technical solution depart from the present invention real
Execute the spirit and scope of example technical scheme.
Claims (8)
1. a broadband scan-type cable local discharge measurement apparatus, it is characterised in that: include wideband high frequency current sensor, signal condition unit and host computer；
High Frequency Current Sensor is electrically connected with signal condition unit by coaxial cable, and signal condition unit electrically connects with host computer,
Signal condition unit includes multistage amplifier, cymoscope and the digital oscilloscope being sequentially connected electrically；
Multistage amplifier is for amplifying the signal of telecommunication of wideband high frequency current sensor；
Cymoscope is used for carrying out the signal of telecommunication after multistage amplifier amplifies detection and the signal of telecommunication being passed to digital oscilloscope,
Digital oscilloscope is used for electrical signal collection, digital image and passes to host computer.
A kind of broadband scan-type cable local discharge measurement apparatus the most according to claim 1, it is characterised in that: described High Frequency Current Sensor is electromagnetic coupled open-close type current sensor based on Luo-coil principle.
A kind of broadband scan-type cable local discharge measurement apparatus the most according to claim 2, it is characterised in that: described High Frequency Current Sensor includes Metal shielding shell and sensor cluster；
Described Metal shielding shell is made up of two split type half boxes (1), and one end of two split type half boxes (1) is hinged by hinge (5), and the other end is hinged by hasp (6)；One axial circular hole (12) of intermediate formation after two split type half box (1) Guan Bis, outside is octagon；
Described split type half box (1) offers half ring-like magnetic core groove (2) along its circumferencial direction, and described magnetic core groove (2) is arranged above with thin cover plate (3)；
Described sensor cluster includes half ring type magnetic core (8) being located in magnetic core groove (2), each half ring type magnetic core (8) is wound with 3 different coils of the number of turn, being respectively equipped with signal output port (4) on wherein 6 limits of described Metal shielding shell, each coil two ends connect with corresponding signal output port (4) respectively；It is filled with insulating barrier in gap (9) between described magnetic core groove (8) and half ring type magnetic core (8).
A kind of broadband scan-type cable local discharge measurement apparatus the most according to claim 3, it is characterised in that: described magnetic core groove (8) is half ring-like groove.
A kind of broadband scan-type cable local discharge measurement apparatus the most according to claim 3, it is characterised in that: described insulating barrier forms by poured with epoxy resin or by silica gel pad.
A kind of broadband scan-type cable local discharge measurement apparatus the most according to claim 3, it is characterised in that: described half ring type magnetic core (8) is nickel-zinc ferrite.
7. according to a kind of broadband scan-type cable local discharge measurement apparatus described in claim 1-6, it is characterised in that: 6 described signal output ports (4) the most corresponding 20K-1MHz, 1M-30MHz, 30-100MHZ, the detection frequency band of 100M-200MHz, 200M-500MHz, 500M-700MHz.
A kind of broadband scan-type cable local discharge measurement apparatus the most according to claim 1, it is characterised in that: digital oscilloscope includes three PicoScope 2208As in parallel with cymoscope；Each PicoScope 2208A has 2 data acquisition channels, and its bandwidth is 200MHz, and continuous sampling mode down-sampling rate is 1GS/s.
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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 |
| 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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| 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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