High Tension Cable Inoxidizing Coating Modified Optimization And Trouble Spots Test Method Research

The high tension cable is the carrier of power transmission.It is the key which the electrical power unit runs normally.The optimum design of inoxidizing coating and insulating property detection have received much attention from domestic and overseas.In the process of cable inoxidizing coating preparation,the inorganic nanoparticles are doped in LDPE in order to complete the modification.It can optimize the material insulating property.Because the high tension cable work in condition of high voltage and heavy current,which the traditional cable inoxidizing coating insulating property detection focus on breakdown performance testing after cable production.The certainty of measurement is poor.The danger coefficient is high,the detection is a high cost and the fault points of high tension cable are hard to locate accurately.Therefore,this paper presents the cable inoxidizing coating of nano-Zn O modified polyethylene according to the nano-Zn O modification method.Making micromechanism detection and breakdown properties detection to do the experimental verification.Because the trouble spots would cause the thermal runaway,this paper presents the inoxidizing coating trouble spots method which the infrared 3D detection combines with stitching technique.It can discriminate the thermal runaway performance of cable inoxidizing coating from trouble spots topography with thermal runaway field strength of material.The optimization of cable inoxidizing coating insulating property could be realized from matrix modification.Noamally,the modification could be done by adding a percentage of nanoparticle in LDPE.In order to study how different configuration nanoparticles affect the interfacial structure and crystal habit of material,adding nano-MMT and nano-Zn O respectively in LDPE to make the contrast experiment.This paper makes insulating property analysis to cableinoxidizing coating with chemical constitution testing,crystal structure testing and micro-domain structure testing.Discussing the cable inoxidizing coating insulating property influence which MMT and Zn O adding to LDPE from microcosmic test result.This paper makes the simulation experiment to cable inoxidizing coating which prepared by different material.The COMSOL software builds the cable model.It can measure the breakdown performance under current field and electromagnetic field.Making the breakdown actual measurement to cable inoxidizing coating material of LDPE,MMT/LDPE and Zn O/LDPE.It can detect the breakdown critical value of different material.The electric breakdown critical value and thermal runaway critical value in two detection modes can validate the COMSOL cable breakdown simulation detection is accord with breakdown actual measurement.It can use COMSOL simulation to replace the breakdown actual measurement which woud cut the production and increase the detection efficiency.The cable inoxidizing coating trouble spots would cause thermal runaway.According to the infrared 3D detection combines with stitching technique can restore the cable surface information better and locate the inoxidizing coating trouble spots truly.In the process of high tension cable infrared stereovision detection,it can design infrared camera calibration target and calculate camera parameter calibration result.In view of infrared picture characteristic points insignificant difference,using SIFT algorithm to extract the characteristic points and fulfil the image matching.The matching images are coplanarity aligning by stereo rectification,which improves the matching accuracy.In view of much more three-dimensional reconstructed noise points in infrared images,making the denoising with k-d tree algorithm and completing the infrared images 3D detection of high tension cable.In order to solve the issue which the Harris algorithm do not possess the scale invariance,this paper adds Gaussian multiscale transformation parameter on the basis of this algorithm.In the process of stitching experiment,this paper uses RANSAC algorithm to eliminate the error matching pairs and fulfills three-dimensional point clouds stitching experiment of infrared cable image.This paper makes qualitative and quantitative analysis to the experimental result,which can validate the algorithm feasibility.The three cables are supplied electricity by cable series arrangement synchronously.The infrared 3D stereo measurement and stitching experiment aredone by three cables with different material quality.From the grey level change in conversion images it can extract the trouble spots.The number of trouble spots and proportion in cables would be counted.From the experimental result,it can validate thermal runaway performance of nano-Zn O modified polyethylene cable inoxidizing coating is better.From the result,the insulating property of nano-Zn O modified polyethylene cable inoxidizing is favourable.The COMSOL simulation could replace the breakdown actual measurement in inoxidizing coating breakdown performance experiment.It can cut the experiment cost and raise the detection efficiency.The infrared 3D detection combines with stitching technique can restore the surface information of cable inoxidizing coating better.It can locate the trouble spots accurately and fulfill the trouble spots online detection.On this account,it can discriminate the material breakdown performance.