NDLI: Development of automatic measurement system for growth and shape of tree by image processing

Please wait, while we are loading the content...

2015 IEEE 11th International Conference on the Properties and Applications of Dielectric Materials (ICPADM)

2012 IEEE 10th International Conference on the Properties and Applications of Dielectric Materials

2009 IEEE 9th International Conference on the Properties and Applications of Dielectric Materials

2006 IEEE 8th International Conference on Properties & applications of Dielectric Materials

Proceedings of the 7th International Conference on Properties and Applications of Dielectric Materials (Cat. No.03CH37417)

Proceedings of the 6th International Conference on Properties and Applications of Dielectric Materials (Cat. No.00CH36347)

Proceedings of 5th International Conference on Properties and Applications of Dielectric Materials

Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)

[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials

Proceedings., Second International Conference on Properties and Applications of Dielectric Materials

Proceedings. Second International Conference on Properties and Applications of Dielectric Materials (Cat. No.88CH2587-4)

Progress of the research on external insulations in China

Evaluation of analytical techniques for the characterization of dielectric materials

Microscopic models for ageing in solid dielectrics

Studies on influencing factors to the ageing of porcelain insulators under DC stresses

An investigation of DC contamination flashover phenomena of suspension insulators

Shaping effects to DC pollution flashover characteristics of insulators

Pollution and rain flashovers on HVDC wall bushings

Arc propagation analysis on polluted insulators based on the leakage current measurement

AC flashover characteristics of EHV line insulators for high altitude contamination regions

Environmental impact on composite EPDM insulators

Tracking resistance of organic insulating materials by merry-go-round test method

An application of the new approach of atmospheric correction factors to tests performed on post insulators

Influence of ultraviolet radiation on space charge and impulse strength of glass

Breakdown of t-decalin due to positive hole streamer

Behaviour of industrial insulating liquids under very high electric stress

The breakdown voltage of the deionized water and transformer oil in the microsecond and nanosecond regions

Study of the time to breakdown under impulse conditions

The relationship between the compositions of dielectric fluid PXE and their toxicity

Analytical investigation for causes of instability of dissipation factor of insulating oil

Automated measurement of density and dielectric permittivity at high pressures

Relating low-frequency dielectric properties and refractive index of mineral oils

Paraffinic transformer oils-Indian experience

Influence of switching impulses on development of partial discharges in oil-impregnated paper insulation

Computer-aided studies of gaseous discharge process

Experimental study on surface flashover of a coaxial cable under nanosecond impulse voltage

Electrical breakdown of vacuum insulation at cryogenic temperature

A new multi-ridge model for electrode surface roughness effect in SF/sub 6/

Electric breakdown behaviour of SF/sub 6/ at lower pressure

Degradation mechanism of Al-doped ZnO elements

Temperature dependence of ultra low frequency dielectric relaxation of SLBT ceramics

Factors affecting the dielectric properties of the system bauxite-feldspar-clay alumina porcelain

Lead magnesium niobate relaxor ferroelectric ceramics of low-firing for multilayer capacitors

Research on rutile ceramics

The surface acoustic wave velocities and electro-mechanical coupling coefficients of AlN thin films

RF sputtered (LaNa)/sub 0.5/Bi/sub 2/Nb/sub 2/O/sub 9/ dielectric thins films

The dielectric spectrum analysis of ZnO nonohmic ceramic material

The breakdown mechanism in barium titanate-based ferroelectric ceramics

Prediction of internal faults of GIS by frequency spectrum of typical vibration on the enclosure

Impact of imperfections in GIS on their electric withstand

The effect of oscillatory switching surges on the breakdown of non-uniform gaps

A method for calculating the breakdown voltages of long air gaps in transmission lines: evaluation of the lightning performance of transmission lines using no shield wire

Breakdown of pulsed power switches triggered by fast-rising impulses

The influence of ions on electrical breakdown in air

Electron emission from dielectric surface due to UV irradiation under atmospheric air condition

Analysis of the characteristics of gas insulated, multiple-stage, high voltage switches

Investigations into pre-discharges in a rod-plane gap under negative lightning impulse voltage

A new model for simulating the effects of space charge in gas discharge

Study on the defect chemistry of Ca/sup 2+/ as acceptor dopant in BaTiO/sub 3/

Computer aided measurement of dielectric properties of saline solutions using a six-port reflectometer

Silicon dioxide films fabricated by ECR microwave plasmas

Dielectric breakdown of PZT ferroelectric ceramics

Investigation on insulating resistance performances of ZnO elements in the oil

Anomalous high permittivity in salty ice-a new dielectric phenomenon

Electrical properties of ZnO-Bi/sub 2/O/sub 3/ two-layer composites

Measurement of the loss tangent of single crystals of CaF/sub 2/ and of LiF with a new highly sensitive loss tangent bridge

Some microstructural characteristics of relaxor ferroelectrics

Effect of some additives on tracking and tracking erosion of EPDM

Research of the anti-seismic performance of porcelain housings for 500 kV zinc oxide surge arresters

Calculation of flashover voltage of polluted insulators under DC and AC voltages

Factors which may affect the inclined plane classification of materials

Composite longrod-the solution of future line insulation in China

On self-shattering of toughened glass insulators

Prediction of the thermal runaway temperature for cap and pin porcelain insulator

AC flashover performance of iced insulators

The study of humidity on flashover voltage characteristics for positive SI

The compositions and properties of electric porcelain materials in China

DC flashover characteristics of the contaminated insulators under low atmospheric pressure

Measurement of dynamic potential distribution during the propagation of a local arc along a polluted surface

Selection of insulation level of HVAC power lines operating in high altitude polluted area

A new stirring method for testing dielectric strength of insulating oil

Electro-active properties of ceramic-polymer composites

High field conduction study of non-oriented hazy polypropylene films

Generalised breakdown models and the integration method for predicting non-standard waveshape impulse strengths

High field electronic conduction in insulators

New concepts in polymer concrete insulation

Computer-assisted dielectric control in curing process of armature windings of DC motors

A model for the simulation of relaxation phenomena in dielectrics

Accuracy in digital measurement of single-shot waveform

Computer-aided design of insulators

Long term electrical and thermal behavior of transformer oil/paper insulation under simulated service conditions

EPR study of the ageing process in epoxy resin

Thermal aging of EPR cables

Thermostimulated depolarization currents in thermally aged polyethylene terephthalate (PET) films

Expediting cellulose insulation aging evaluation and life prediction through degree of polymerization measurements

Partial discharge amplitude distribution analysis for the evaluation of ageing progression in voltage endurance tests

Degradation of electrical insulating paper monitored using high performance liquid chromatography

The influence of molecular properties of additives on the stability of polyethylene in high electric fields

Electrical properties of ethylene/silane copolymers

An analytical method based on hopping model: calculation of ionic space charge polarization in an insulating film

Long time range breakdown in polymeric insulating films subjected to step voltage

Thermally stimulated current studies on ethylene-propylene rubber with fillers

Thermally stimulated currents due to ionic carriers in polysulfone

The local energy level of polyimide

The research on crosslinked polyethylene for electric cable

The investigation and relationship between space charges and pre-breakdown of solid dielectrics

Detection of Joule heating before dielectric breakdown in polyethylene films

Effect of polar groups on the electrical breakdown strength of plasma polymer films

Light sensor and image processing system as detectors of tracking deterioration

Radiation resistance of ethylene-styrene copolymers

Application of p-phenylene derivatives as antioxidants to the insulating polyethylene

Distribution of discharge magnitude under local breakdown condition in void

Measurement of spatial electric field distribution in polymer films by using an acoustic step-wave probing technique

Investigation of breakdown values and charge storage properties of PVDF

Regularity of breakdown of solid dielectrics after moisture absorption

Analysis of the depolarized current in polyvinylidene flouride

The effect of morphology on electric and electronic properties of polyimide films

Surface modification of polypropylene treated by low temperature plasma treatment

Development and tests of extruded polyethylene insulated superconducting cable

Some observations on artificial cavities in a cross-linked polyethylene

Measurement of charge distributions in insulating materials for high voltage cables

Study of rapid thermal evaluation for form-wound winding insulation systems

All stator windings are not created equal

The long service performance of Pb-laminated plastics layer for water-impervious XLPE cable

Influence of insulation morphology, impurities and oxidation on cables electric properties

The relationship between electro-chemical-tree ageing and charge relaxations behaviour of XLPE power cables

Testing experiences on mixed dielectric capacitors for high voltage DC filter applications

The characteristics of insulation resistance of transformers

On the effect of temperature on the propagation of water trees in polyethylene

Water treeing retardant XLPE insulation grade with improved electrical endurance

Development of watertree retardant XLPE cables

The influence of morphology on electrical tree initiation in the polyethylene under AC and impulse voltages

Some considerations on water tree in polyolefin

Effect of additives on DC treeing breakdown in polyethylene under divergent field

Water treeing as a mechanical damage: influence of process parameters

Development of automatic measurement system for growth and shape of tree by image processing

Different aspects of testing of the resistance of polyethylene materials to the inception of treeing and to the treeing breakdown

Influence of ions on the growth of water trees

Evaluation of internal electric field by separation method

Investigation of soil as a lossy dielectric

Fractal properties of breakdowns

Modelling of the dielectric response of materials containing mobile charges

Study of dielectric relaxation phenomena in ultra-thin films (Langmuir-Blodgett films) by thermally stimulated electrical measurements: effect of film structure

Separating discharge in transfer of insulating sheet

The origin of the distribution of dielectric relaxation times in amorphous solids

The use of regression experimental design to study some factors effecting the curing process of an epoxy resin

Measuring permittivity and permeability of high-loss solid materials at microwave frequencies

Insulation co-ordination for low-voltage equipment

Discharge voltage of dielectric gaps and the generalized secondary ionization coefficient gamma of the dielectric cathode

The electromagnetic radiation and scanning characteristics of a circular dielectric resonator loaded with metallic discs

A narrow beam leaky-wave antenna using an artificial dielectric

Investigation of line streamers of dielectric surface by using dust figure techniques

Relationship between streaming current and activation energy

Nanosecond pulse surface discharge on insulator of plasma focus device

A new method for measuring ultra-low frequency dielectric spectroscopy

Thermal performance evaluation of an insulation system for cast resin power transformers

The study of interreaction of insulating oils with PP film-the effect of impregnant on crystal structure of PP film

Correlation between charge injection and electroluminescence in polyethylene under prebreakdown AC field

Study of space charge effects in polyethylene by thermal pulse current technique

Effect of temperature and humidity on electrical breakdown characteristics of low-density polyethylene film for the various stressing modes

Factors affecting partial discharges in SF/sub 6/ gas impregnated polymer film insulation

Electric breakdown and space charges in ethylene-vinyl-acetate (EVA) incorporated polyethylene

Surface charge decay on insulating films

Short term effects of DC and AC corona on the surface electrical properties of polymer films

On the origin of partial discharges in condensed matter

The study of acoustic emission method for detection of partial discharge in power transformer

Computer-aided partial discharge amplitude distribution measurement system for large electrical machines diagnosis

Development of tuning type partial discharge detector with noise discrimination and computer aided automation system

On-site measurement and location of partial discharges in transformers without the need of special HV supply

Measurement of partial discharge of large generator stator insulation

Recent study of acoustic emission location for partial discharge in UHV transformers and shunt reactors

Measurements of the energy of partial discharges

On-site automatic measurement of HV insulation

An experimental study of the damaging effects of harmonics in power networks on the capacitor dielectrics

A study on properties of some novel power capacitors

Breakdown phenomena in cross-linked polyethylene (XLPE) under high hydrostatic pressure

Estimation and analysis of XLPE cable life in China

Investigation on withstand voltage of turn insulation of high voltage motors

Optimization of anti-corona construction for HV generator and its verification test

Study of flame resistant ethylene-propylene rubber insulation formulary

An application of polyacrylonitrile (PAN) oxygen catalytic fibre (motor corona protection)

Polypropylene film dielectric used in power capacitors

Space charge in extruded insulation under DC divergent field

Study of the dielectric properties of oil impregnated PPLP for UHV cable insulation

The evaluation of reliability of class F insulation for generators

Dielectric performances of SF/sub 6/ impregnated polypropylene film capacitor

Size determination of contaminants in HV XLPE cable insulation with holographic technique

The study of structure and properties of polypropylene film for oil-filled cable

Measurement of tg delta and C of single-phase electrical apparatus with capacitive insulation under operating voltage

Comparison of the minimum breakdown level of SF/sub 6/ mixtures in inhomogeneous gaps under steep wave front impulse and double-exponential impulse

Statistical aspects of discharges in highly purified tetramethyl-pentane

A comparative testing approach to the selection of polymeric materials for outdoors insulators

Flashover characteristics of barrier insulation under uni-directional and bi-directional oscillatory impulse voltages

Transformerboard insulation under HVDC

The influence of gases in solution in the polymer on the propagation of water trees

Effect of surfactants in water treeing

Dielectric spectroscopy of the characterization of the structure of amorphous polymeric materials

Dielectric spectroscopy for the characterization of the microstructure of latexes

Dielectric spectroscopy for the investigation of inter and intramolecular mobility in biopolymers

Study of the compatibility of self-healing polypropylene capacitors with impulsive conditions met in power electronics applications

High-voltage field testing of GIS from a physical view-point

Comparison of methods suggested for conveniently reproducing lightning overvoltages

A review of the composite dielectric insulated underground transmission cable

Elevated temperature operation of XLPE distribution cable system

Chemical, physical and microstructural properties of thermally aged XLPE cable models

Modern turn insulation for stator windings with form-wound coils, in high-voltage rotating machines

Development of automatic measurement system for growth and shape of tree by image processing

Content Provider	IEEE Xplore Digital Library
Author	Yanagiwara, M. Yoshimura, N. Noto, F.
Copyright Year	1988
Description	Author affiliation: Akita Nat. Coll. of Technol., Japan (Yanagiwara, M.)
Abstract	A system to automatically measure the tree degradation phenomenon in organic insulating materials using an optical microscope is discussed. Cross-linked polyethylene was used as the sample material. A video-graphic processing method made it possible to examine the initialization period of the treeing phenomenon and to measure the tree length, surface area, and form of propagation using serial video images. As a result, it was possible in a long-time breakdown test, to demonstrate characteristic difference in tree length and surface area according to the size of the applied voltages in the period immediately after initialization. When the voltage was low the tree shape resembled the branches of a tree. As the voltage increased, the shape of the breakdown area formed a round chestnut-like tree. In a short-time breakdown test, it was shown that length and surface area were greatly influenced by the radius of curvature of the needle electrode. This difference was evident 20 s after the initialization of the tree. When the radius of the needle electrode tip was large, the tree took on a bushlike shape. When the radius was small the tree went from a tree-branch shape to a bushlike shape.
Starting Page	499
Ending Page	502
File Size	273828
Page Count	4
File Format	PDF
DOI	10.1109/ICPADM.1988.38442
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1988-09-12
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Shape measurement Breakdown voltage Trees - insulation Optical materials Optical microscopy Testing Needles Electrodes Thermal degradation Organic materials
Content Type	Text
Resource Type	Article

Central Library (ISO-9001:2015 Certified)
Indian Institute of Technology Kharagpur
Kharagpur, West Bengal, India | PIN - 721302

See location in the Map
03222 282435
Mail: support@ndl.gov.in

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in