CN204008555U - Can the online electromagnetic nondestructive device of split high voltage transmission line - Google Patents
Can the online electromagnetic nondestructive device of split high voltage transmission line Download PDFInfo
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- CN204008555U CN204008555U CN201420478430.XU CN201420478430U CN204008555U CN 204008555 U CN204008555 U CN 204008555U CN 201420478430 U CN201420478430 U CN 201420478430U CN 204008555 U CN204008555 U CN 204008555U
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Abstract
The utility model discloses one can the online electromagnetic nondestructive device of split high voltage transmission line, and comprising can be along power transmission line radial arrangement for detection of the excitation DC electromagnet of defect on power transmission line steel core, for detection of the Hall sensor array of power transmission line joint steel core docking location be used for detecting on the outer aluminum stranded conductor of power transmission line the two halves formula eddy current coil array of disconnected strand; Enable on power transmission line, to install and obstacle detouring easily.DC electromagnet and Hall sensor array and power transmission line are completely separable, and magnet magnetic core is placed along power transmission line radial direction, thereby has shortened the distance between two magnetic poles, has reduced the loss of magnetic flux.Utilize two coil electricities to produce DC electromagnetic field, be conducive to realize power transmission line is carried out to saturated magnetization, increase the sensitivity detecting.In the eddy current coil array of two halves formula, every group of coil adopts two exiting forms, increased the depth of penetration of eddy current in power transmission line, is conducive to realize the detection of deep crackle and damage.
Description
Technical field
The utility model relates to a kind of Dynamic Non-Destruction Measurement, and especially one can the online electromagnetic nondestructive device of split high voltage transmission line.
Background technology
At present, high voltage power transmission line structure intact, extremely important for the safe operation of transmission system.Power transmission line, owing to being operated in open air, is bearing huge alternation tension force and the bending stress being caused by vibration for a long time, inevitably cause the wire of transmission line of electricity and ground wire crack, disconnected strand etc.Power transmission line also can sharply change and thunderbolt etc. causes surface damage because of temperature in addition, if be laid on beach and manufacturing district, easily because salt fog and acid rain etc. cause corrosion damage.More easily produce in addition dangerous in joint at power transmission line, because the effect of alternation tension force and bending stress, if make steel core open joint depart from the center of the aluminium hydraulic pressed connecting pipe that continues, through the regular hour, two sections of steel cores in aluminium hydraulic pressed connecting pipe will be opened and space is increased, finally likely cause electric wire to be pulled off, therefore two sections of steel cores docking location in aluminium hydraulic pressed connecting pipe also requirement can accurately detect.
At present, to the lossless detection method of high voltage transmission line mainly contain 1, ocular estimate, 2, Infrared Detection Method, 3, rays method, 4, electromagnetic detection method etc.Power transmission line detection method based on electromagnetic principle has the advantages such as equipment is simply light, testing result is visual and understandable, easily be automated, and can carry out easily detecting in real time on line.Electromagnetic detection is divided into Magnetic Flux Leakage Inspecting and two kinds of methods of EDDY CURRENT.Two kinds of methods respectively have relative merits, and EDDY CURRENT has very high sensitivity for the damage of power transmission line external aluminium twisted wire, but owing to being subject to the impact of eddy current skin effect, cannot detect the defect in inner steel core.Because the external aluminium twisted wire of power transmission line does not have shielding action to magnetic field, so, detect steel core defect and can adopt Magnetic Flux Leakage Inspecting.The combination of two kinds of methods just in time can be learnt from other's strong points to offset one's weaknesses, and therefore, adopts electromagnetism method for comprehensive detection can detect all sidedly the defect in power transmission line.
Because the high voltage transmission line of actual motion is all the high vacancy that is erected at liftoff twenty or thirty rice, in order to facilitate installation and the obstacle detouring of checkout equipment on power transmission line, desirable scheme is that whole pick-up unit can be realized automatic open and close under ground monitoring, and this just requires plant machinery structure and power transmission line itself is discerptible.Current existing leakage magnetic detection device adopts the permanent magnet of U font to power transmission line steel core axial magnetized more, in order to increase detection sensitivity, the be everlasting multiple magnetic field sensors of the whole circumferential arrangement in power transmission line circular section and eddy current coil, be then enclosed in package unit in a casing.This device form all needs to participate in manually in the time installing and take off, and is difficult to realize automatic open and close.Traditional electromagnet of arranging is vertically because the distance between two magnetic poles is large in addition, and the loss of magnetic flux in air and electric wire is more serious, is difficult to realize the saturated magnetization to power transmission line steel core, detection signal a little less than.The eddy current coil adopting is now simple send-receive formula, and the length of penetration of the current vortex producing like this in power transmission line is limited.
Chinese patent application CN103645243A discloses a kind of power transmission line electromagnetic nondestructive system, it comprises excitation unit, magnetic leakage signal detecting unit, eddy current sensor unit, orthogonal phase-locked amplifying unit, signal condition unit, eddy current power amplification unit, AD conversion unit, pumping signal generating unit, ARM control module, SD card data storage cell, data transmission unit, host computer data processing unit, described magnetic leakage signal detecting unit comprises two Hall element unit and differential amplifier, eddy current sensor unit comprises the eddy current drive coil and the test coil of eddy current that are arranged in successively on power transmission line.This patented claim is mainly about the design of electromagnetic detection exiting signal generating circuit and transducing signal post processing circuitry.In this patented claim in the space of Hall element cell layout between electromagnet magnetic core and power transmission line, due to the restriction of Hall element maximum detection range (being generally 0.06～0.07T), electromagnetism magnetic field in magnetic circuit can not be increased to the magnetic field intensity of saturated magnetization, otherwise the maximum detection range that can exceed sensor causes surveying the variation less than magnetic field intensity.
In this patent CN103645243A, two copper cash that can separate eddy current coil are to be directly wound on the plastic coil skeleton of two halves formula, circumferentially just only have two independently coils at power transmission line like this, cannot judge accurately the circumferential position damaging in aluminum stranded conductor.
Utility model content
The purpose of this utility model is for overcoming above-mentioned the deficiencies in the prior art, provides the one can the online electromagnetic nondestructive device of split high voltage transmission line.
For achieving the above object, the utility model adopts following technical proposals:
One can the online electromagnetic nondestructive device of split high voltage transmission line, and comprising can be along power transmission line radial arrangement for detection of the excitation DC electromagnet of defect on power transmission line steel core, for detection of the Hall sensor array of power transmission line joint steel core docking location be used for detecting on the outer aluminum stranded conductor of power transmission line the two halves formula eddy current coil array of disconnected strand;
Described excitation DC electromagnet comprises Back Word type electrical pure iron magnetic core and is symmetricly set in two cylindrical, copper coils on Back Word type electrical pure iron magnetic core, the air-gap that power transmission line can be positioned over to center position for disconnecting in the middle of the lateral part, lower end of Back Word type electrical pure iron magnetic core;
Described Hall sensor array comprises the Hall element of five pairs of energy along the circumferential arranged in series of power transmission line upper surface, and every a pair of Hall element is by two tandem Hall element differential connecting to form between two vertically; It is on circular arc or polygonal fixed block that Hall element is arranged on end, and fixed block upper end is connected in the top of Back Word type electrical pure iron magnetic core inside;
Described two halves formula eddy current coil array comprises two semi-circular and can peg graft and separate shells, on each enclosure arcwall face, be provided with the five groups of hollow thin pies that can arrange along the circumferential half-turn of power transmission line, every group of coil is responsible for detecting the circumferential fritter corresponding region of electric wire; Every group of coil forms for the magnetic field sensing coil that encourages the drive coil of eddy current and be clipped between the two by two that arrange forwards, backwards along semicircle enclosure axis, and two drive coil direction of windings are contrary, can increase like this depth of penetration of eddy current in power transmission line aluminum stranded conductor, realize the detection of twisted pair wire deep crackle and disconnected thigh.
Two magnetic pole place structures in echelon of described excitation DC electromagnet, are conducive to the gathering of magnetic flux.
Described fixed block employing is gluing to link together with magnetic core.
The material of described fixed block is plastics or non-ferromagnetic metal, avoids the leakage in magnetic field in magnetic circuit.
Described shell is plastic material.
Compared with prior art, DC electromagnet radially to electric wire magnetization, can make the Distance Shortened between two magnetic poles along power transmission line to the utility model like this, and flux loss reduces.Cylindrical, copper coil is wound on electrical pure iron magnetic core the right and left, in coil, passes into enough large electric current, by the magnetic field enlarging markedly in magnetic core, can realize the saturated magnetization to power transmission line steel core and joint steel aluminium hydraulic pressed connecting pipe, increases the detection sensitivity of steel core defect.
Tandem Hall element differential connection between two vertically, circumferential five groups of sensors series connection, can not only increase the output signal of sensor like this, can also reduce to a certain extent sensor and power transmission line surface distance changes the interference bringing to output signal.
The shell of two halves formula eddy current coil array is discerptible, can be arranged on existing mechanical paw and be driven and realized opening and closing by mechanical paw, is close to conductive line surfaces and moves and detect vertically while closing inside coil.
The utility model improves traditional leakage magnetic detection device, and device is separated completely with power transmission line body, therefore can realize the docking location detection that is applicable to steel core in power transmission line joint.
Patent CN103645243A is mainly about the design of electromagnetic detection exiting signal generating circuit and transducing signal post processing circuitry, this patent of comparing, the utility model is in order to realize the accurate detection to the steel core docking location in power transmission line coupling compression joint pipe and deep broken string and crackle in the outer aluminum stranded conductor of electric wire to be carried out to axial and circumferential location, mainly original leakage field and eddy current testing device structure are done to larger improvement, now the difference of two patents have been expressed as follows:
1. two of power transmission line joint sections of steel cores are inserted in steel aluminium hydraulic pressed connecting pipe, due to the magnetic screening action of ferromagnetic steel pressure pipe, the magnetic field that can cause excitation electromagnet to produce can not penetrate in the steel core in the middle of electric wire, cannot effectively detect the docking location of steel core.The method solving is the number of turn that increases magnet coil in excitation unit, increase exciting current and make excitation field reach 1～2T, so just can carry out saturated magnetization to steel aluminium hydraulic pressed connecting pipe, the magnetic permeability of steel pressure pipe reduces, thereby shielding action is significantly reduced, and magnetic field just can directly penetrate in steel core.
In patent CN103645243A in the space of Hall element cell layout between electromagnet magnetic core and power transmission line, due to the restriction of Hall element maximum detection range (being generally 0.06～0.07T), electromagnetism magnetic field in magnetic circuit can not be increased to the magnetic field intensity of saturated magnetization, otherwise the maximum detection range that can exceed sensor causes surveying the variation less than magnetic field intensity.
Position to Hall element in the utility model is adjusted, and sensor has been moved on to from magnetic circuit to the peripheral surface of power transmission line, has so just eliminated the restriction of sensor sensing range to excitation field intensity.Coil in excitation electromagnet becomes two from one, makes the effective length of coil elongated, has increased the number of turn of coil, more easily increases the magnetic field intensity in magnetic circuit, realizes the saturated magnetization to steel pressure pipe.The broken string of two sections of steel core joints can cause that the Distribution of Magnetic Field in magnetic circuit changes, and this variation meeting is received by the Hall element on electric wire surface, thereby detects the docking location of joint steel core.
2. in patent CN103645243A, two copper cash that can separate eddy current coil are to be directly wound on the plastic coil skeleton of two halves formula, circumferentially just only have two independently coils at power transmission line like this, cannot judge accurately the circumferential position damaging in aluminum stranded conductor.
In the utility model, ten groups of eddy-current coils are embedded in two plastic casings that wrap up power transmission line, circumferentially form eddy current coil array at power transmission line, every group of coil is responsible for detecting the circumferential pocket of aluminum stranded conductor, thereby can realize the circumferential location to damage.
Due to the skin effect of eddy current, the current vortex that traditional send-receive formula eddy current coil produces cannot penetrate into the depths of aluminum stranded conductor deep damage is detected.The utility model, in order to overcome this deficiency, improves the energisation mode of eddy current coil.Adopted the coil of two copper wire winding opposite directions to encourage generation current vortex simultaneously, stack can occur the overlapping region on aluminum stranded conductor, two vortex fields increases the intensity of eddy current, can increase to a certain extent like this input degree of depth of eddy current, realize the reliable detection to the damage of aluminum stranded conductor deep.
The utility model has improved the structure of traditional electromagnetism without pick-up unit, has adopted the leakage magnetic detection device that separates completely with power transmission line and the eddy current coil sensor array of two halves releasable, realizes the online detection to defect on power transmission line steel core and aluminum stranded conductor.Enable on power transmission line, to install and obstacle detouring easily.DC electromagnet and Hall sensor array and power transmission line are completely separable, and magnet magnetic core is placed along power transmission line radial direction, thereby has shortened the distance between two magnetic poles, has reduced the loss of magnetic flux.Utilize two coil electricities to produce DC electromagnetic field, be conducive to realize power transmission line is carried out to saturated magnetization, increase the sensitivity detecting.In the eddy current coil array of two halves formula, every group of coil adopts two exiting forms, increase the depth of penetration of eddy current in power transmission line, be conducive to realize the detection of deep crackle and damage, expand the range of application of electromechanical detection method in the online detection of power transmission line, facilitate at the on-the-spot electromagnetic sensor of high voltage transmission line and installed and obstacle detouring, Site Detection is had to better applicability, in power transmission line damage check, have broad application prospects.
Brief description of the drawings
Fig. 1 is that embodiment of the utility model uses structure graph;
Fig. 2 is the front view of having hidden coil case in the utility model embodiment;
Fig. 3 is Hall sensor array mounting means figure;
Fig. 4 (a), Fig. 4 (b) are the schematic diagram of power transmission line joint steel core docking location Magnetic Flux Leakage Inspecting;
Fig. 5 is the version figure of eddy-current coils array;
Wherein 1. power transmission lines, 2. Back Word type electrical pure iron magnetic core, 3. cylindrical, copper coil, 4. Hall sensor array, 5. fixed block, 6. two halves formula eddy current coil array, 7. shell, 8. aluminum casing, 9. steel aluminium hydraulic pressed connecting pipe, 10. air, 11. joint steel cores, 12. spaces, 13. drive coils, 14. magnetic field sensing coils.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated.
In can split high voltage transmission line electromagnetic detection sensor array, as shown in Figure 1 and Figure 2, excitation electromagnet and Hall sensor array 4 are for detection of the position of the defect on power transmission line steel core and the docking of power transmission line joint steel core, and one group of two halves can be used for detecting disconnected strand of equivalent damage on the outer aluminum stranded conductor of power transmission line by opening type eddy current coil array 6.Package unit can be driven along power transmission line 1 axially-movable by existing climbing robot, in real time to the damage check in a segment length.
Power transmission line 1 is placed on the center position of the air-gap of magnetic core, and DC electromagnet is radially placed along power transmission line here, and compared with the magnetized electromagnet of conventional axial, this configuration mode can make the Distance Shortened between two magnetic poles, and flux loss reduces.Trapezium structure is processed at two magnetic pole places, is conducive to the gathering of magnetic flux.Adopt two cylindrical, copper coils 3 to be wound on electrical pure iron magnetic core both sides, in coil, pass into enough large electric current, by the magnetic field enlarging markedly in magnetic core 2, can realize the saturated magnetization to power transmission line steel core and joint steel aluminium hydraulic pressed connecting pipe, increase the detection sensitivity of steel core defect.
As shown in Figure 3, Hall sensor array 4 comprises five pairs of ten Hall elements along power transmission line upper surface circumferential arrangement in front and back.Hall sensor array 4 is placed on the upper surface of power transmission line 1, the differential connection between two of axial tandem Hall element, circumferential five groups of sensors series connection, the output signal of sensor can be increased like this, sensor can also be reduced to a certain extent and power transmission line 1 surface distance changes the interference bringing to output signal; It is on circular arc or polygonal fixed block 5 that Hall element is arranged on end, and fixed block 5 can adopt the mode such as gluing and magnetic core 2 to link together, and the material of fixed block 5 is plastics or non-ferromagnetic metal, avoids the leakage in magnetic field in magnetic circuit.
The utility model improves traditional leakage magnetic detection device, and device is separated completely with power transmission line body, therefore can realize the docking location detection that is applicable to steel core in power transmission line joint.The principle of power transmission line Magnetic Flux Leakage Inspecting is as shown in Fig. 4 (a), Fig. 4 (b).The embodiment of Magnetic Flux Leakage Inspecting steel core docking location is as follows:
Three-back-shaped electrical pure iron magnetic core 2 and two cylindrical, copper coils 3 form an electromagnet, pass into direct current in magnet coil, can in iron core, produce magnetic flux.Magnetic core 2 and magnet coil 3 and Hall sensor array 6 are driven and are axially moved on power transmission line by existing climbing robot, and Hall sensor array detects the situation of change of magnetic flux in magnetic circuit in real time.In figure, 8 is the outer field aluminum casings of power transmission line aluminum stranded conductor, the 9th, and the outer field steel aluminium hydraulic pressed connecting pipe of steel wire, the 10th, the air in the middle of aluminum casing and steel pressure pipe.When sensor is positioned at the complete place of joint steel core 11, in magnetic circuit, magnetic flux B is constant, and sensor array is the signal of level all the time.When moving to power transmission line joint steel core joint, now two sections of separately segment distance formation spaces 12 of steel core, the magnetic flux in magnetic circuit is because steel core is varied to B' from having to the transition of nothing.Hall sensor array is because the variation of magnetic flux can be exported a fluctuation signal, and this signal is presented on PC screen after the processing such as filter and amplification, and technician changes the information such as position and size that can analyze defect according to the fluctuation of display.
As shown in Figure 4, leakage magnetic detection device and power transmission line body are completely separable, in the time that needs detect, only need manual installation or make power transmission line 1 be positioned at the middle of the air-gap of three-back-shaped electrical pure iron magnetic core by mechanical arm thrust unit.In the time running into obstacle in operational process, can depart from power transmission line surface by controlling mechanical arm pull unit, this has just solved the automatic open-close problem of equipment under obstacle detouring state easily.
Two halves formula eddy current coil array 6 is for detecting disconnected strand of equivalent damage on the outer aluminum stranded conductor of power transmission line, eddy current coil array 6 comprises ten groups of hollow pancake coils along the whole circumferential arrangement of power transmission line as shown in Figure 5, and every group of coil is responsible for detecting the circumferential fritter specific region of electric wire.Every group of coil by two of axial front and back for encouraging the drive coil 13 of eddy current and the magnetic field sensing coil 14 being clipped between the two to form, two drive coil 13 direction of windings are contrary, can increase like this depth of penetration of eddy current in power transmission line aluminum stranded conductor, realize the detection of twisted pair wire deep crackle and disconnected thigh.
Two halves formula eddy current coil array 6 is driven and is moved on power transmission line axial length by existing mechanical paw and climbing robot.In coil, pass to high-frequency alternating electric current, will produce current vortex on power transmission line surface.The original signal of coil is filtering high-frequency signal after phase-locked amplification is processed, and finally exports one section of direct current signal stably.If there is a disconnected strand of equivalent damage in aluminum stranded conductor, can make eddy current produce distortion, coil can sense in real time due to the eddy current space magnetic field variation causing that distort simultaneously.When coil movement is to injury region, coil produces a fluctuation signal at damage position, and technician analyzes the information of aluminum stranded conductor damage according to the feature of fluctuation signal.In comparator array, the output signal of each coil also can be judged the circumferential position of disconnected strand of twisted wire.
Eddy current coil array 6 is divided into two parts and is encapsulated in respectively in two plastic casings 7.Two shells 7 are discerptible, and therefore they and power transmission line 1 surface are also discerptible.In the time that needs detect, can make them be wrapped in the circumferential surface of power transmission line 1 by manual installation or by controlling closed two half-coils that drive of mechanical paw.In the time running into obstacle in operational process, open and make coil array depart from power transmission line 1 surface by control mechanical paw, so just can realize the folding of coil array.
In sum, the utility model has improved the version of traditional electromagnetism without detecting sensor, utilize the leakage magnetic detection device and the two halves releasable eddy current coil array that separate completely with power transmission line, realize the online detection to defect on power transmission line steel core and aluminum stranded conductor, expand the range of application of electromechanical detection method in the online detection of power transmission line, installation and obstacle detouring at the on-the-spot electromagnetic sensor of high voltage transmission line are facilitated, Site Detection is had to better applicability, in power transmission line damage check, have broad application prospects.
By reference to the accompanying drawings embodiment of the present utility model is described although above-mentioned; but the not restriction to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendments that creative work can make or distortion still in protection domain of the present utility model.
Claims (5)
- One kind can the online electromagnetic nondestructive device of split high voltage transmission line, it is characterized in that, comprising can be along power transmission line radial arrangement for detection of the excitation DC electromagnet of defect on power transmission line steel core, for detection of the Hall sensor array of power transmission line joint steel core docking location be used for detecting on the outer aluminum stranded conductor of power transmission line the two halves formula eddy current coil array of disconnected strand;Described excitation DC electromagnet comprises Back Word type electrical pure iron magnetic core and is symmetricly set in two cylindrical, copper coils on Back Word type electrical pure iron magnetic core, the air-gap that power transmission line can be positioned over to center position for disconnecting in the middle of the lateral part, lower end of Back Word type electrical pure iron magnetic core;Described Hall sensor array comprises the Hall element of five pairs of energy along the circumferential arranged in series of power transmission line upper surface, and every a pair of Hall element is by two tandem Hall element differential connecting to form between two vertically; It is on circular arc or polygonal fixed block that Hall element is arranged on end, and fixed block upper end is connected in the top of Back Word type electrical pure iron magnetic core inside;Described two halves formula eddy current coil array comprises two semi-circular and can peg graft and separate shells, on each enclosure arcwall face, be provided with the five groups of hollow thin pies that can arrange along the circumferential half-turn of power transmission line, every group of coil is responsible for detecting the circumferential fritter corresponding region of electric wire; Every group of coil forms for the magnetic field sensing coil that encourages the drive coil of eddy current and be clipped between the two by two that arrange forwards, backwards along semicircle enclosure axis, and two drive coil direction of windings are contrary.
- 2. as claimed in claim 1 can the online electromagnetic nondestructive device of split high voltage transmission line, it is characterized in that two magnetic pole place structures in echelon of described excitation DC electromagnet.
- 3. as claimed in claim 1 can the online electromagnetic nondestructive device of split high voltage transmission line, it is characterized in that, described fixed block adopts and gluingly links together with magnetic core.
- 4. as claimed in claim 1 can the online electromagnetic nondestructive device of split high voltage transmission line, it is characterized in that, the material of described fixed block is plastics or non-ferromagnetic metal.
- 5. as claimed in claim 1 can the online electromagnetic nondestructive device of split high voltage transmission line, it is characterized in that, described shell is plastic material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420478430.XU CN204008555U (en) | 2014-08-22 | 2014-08-22 | Can the online electromagnetic nondestructive device of split high voltage transmission line |
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| CN201420478430.XU CN204008555U (en) | 2014-08-22 | 2014-08-22 | Can the online electromagnetic nondestructive device of split high voltage transmission line |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104215688B (en) * | 2014-08-22 | 2016-09-21 | 国家电网公司 | Can split high voltage transmission line online electromagnetic nondestructive device |
| CN106770632A (en) * | 2015-11-24 | 2017-05-31 | 核动力运行研究所 | A kind of probe of the dc magnetization based on receiving type coil suitable for omega welding seam |
| CN110441327A (en) * | 2019-08-15 | 2019-11-12 | 朱华军 | High voltage cable damaged mark device |
| CN110579528A (en) * | 2019-08-13 | 2019-12-17 | 山东电力工业锅炉压力容器检验中心有限公司 | ACFM probe and method for detecting GIS shell D-type weld joint |
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2014
- 2014-08-22 CN CN201420478430.XU patent/CN204008555U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215688B (en) * | 2014-08-22 | 2016-09-21 | 国家电网公司 | Can split high voltage transmission line online electromagnetic nondestructive device |
| CN106770632A (en) * | 2015-11-24 | 2017-05-31 | 核动力运行研究所 | A kind of probe of the dc magnetization based on receiving type coil suitable for omega welding seam |
| CN106770632B (en) * | 2015-11-24 | 2023-06-16 | 核动力运行研究所 | Direct current magnetization probe suitable for omega welding seam and based on receiving and transmitting type coil |
| CN110579528A (en) * | 2019-08-13 | 2019-12-17 | 山东电力工业锅炉压力容器检验中心有限公司 | ACFM probe and method for detecting GIS shell D-type weld joint |
| CN110441327A (en) * | 2019-08-15 | 2019-11-12 | 朱华军 | High voltage cable damaged mark device |
| CN110441327B (en) * | 2019-08-15 | 2021-12-14 | 广西电网有限责任公司河池供电局 | High-voltage cable breakage marking device |
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