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A B C D E F G H I K M N O P R S T U

A

A Micro Electro-freezing Chip Used in the Crystallization of Aqueous Solutions under AC Electric Field

3.7.13Yahong Ma, Lisheng Zhong, Huiyu Hu, Qinyue Yu, Yewen Zhang, China

A Multiple Regression Model for The Estimation of Moisture in Oil Impregnated Paper Insulation (OIP)

1.6.1Manoj Mandlik, T S Ramu Sastry

A New Combined Shielding Structure for Composite Insulators on 1100kV UHVAC Power Lines in China 3.2.5Peng Liu, Tian-xi Xie, jing Li, Zong-ren Peng, China

A New Structure of Full Optical Fiber Current Sensor

3.5.3Dai Wan, Lisheng Zhong, Qinxue Yu, George Chen, China

A novel method to detect super-fast detrapping space charge

2.5.2Feihu Zheng, Chen Lin, Chuandong Liu, Yewen Zhang, Zhenlian An, China

A Study on Diagnostics of Water Tree in XLPE Cable based on Loss Current Harmonics Measurement with Frequency Resonance HV Supply 2.2.5Zhonghua Li, Li Zhou, Zhen Gao, Yu Chen, China

A Study on Dielectric Properties of Oil-paper Insulation at Low Temperature

3.1.3Wenmin Guo, Ming Ao, Chong Zhao, Zhonghua Li, China

AC Dielectric Characterization Parameters of Nonlinear Insulating Dielectrics and Their Measurement 2.7.18

Huan ZHENG, Zhonghua Li, Yu Chen, China

Aging And Lifetime Prediction In Mineral Oil Of Rubber

1.7.18Kang Peng, Mingzhu Xiao, Zhibin Zeng, China

An Attempt to Investigate the Transformer Failure by using DGA and SFRA Analysis

2.7.4Shubhangi Patil, Sushil Chaudhari, India

Analysis on the Longitudinal Temperature and Computation of Ampacity of 10kV Cables in Pipes Crossing Thermally Unfavorable Regions - Yan-Ling Zheng, Zhi-liang Xu, Guan 3.3.3Jun Zhang, China

Application of a Class of Nanofluids to Improve loadabillity of power transformers1.1.1

T.S.Ramu sastry, B.K.Keshavan Belur, K.N.Balasubramanya Murthy,India

Application Of A New Sensor Circuit Model In The Oil Dissolved Gas Monitoring

2.4.5Ying-feng Zhao, China

Application of Neural Networks for Transformer Fault Diagnosis

2.7.11Venkatasami Athikkan, Latha Muthuraj, Kasirajan Kasipandian, India

Application Of RVM Technique To Study the Polarisation And Depolarisation Characteristics Associated With Thermal Ageing Of Epoxy Mica Composite 3.5.1Nageshwar Rao B, Sundara Rajan J, Ramachandra B, India

Assessing Smoke & Fire Hazards Of Burning Electric Cables

2.7.6Nageshwar Rao B, Arunjothi R, Srinivasan A. R, India

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Assessment Of Water Logged Cables By Very Low Frequency Tan Delta Testing Technique2.2.6

NAGESHWAR RAO B, MALLIKARJUNAPPA K, India

B

Behaviour of water droplets on polymer surface

1.7.19Nagaraj HP Panchakshariah, Vasudev N, Ravi. KN, India

Boron Nitride filled Immiscible Blends of Polyethylene and Ethylene-Vinyl Acetate Copolymer: Morphology and Dielectric Properties 3.7.9– Wenzhe Dong, Zhidong Han, Baozhong Han, China

Breakdown Performance of Low Density Polyethylene Nanocomposites

1.1.6Guilai Yin, Shengtao Li, Jianying Li, China

C

Chemiluminescence as a Clear Diagnostic Tool of Polymer Oxidation

2.2.1Yoshimichi Ohki, Naoshi Hirai, Japan

Comparative Performance of Silicone Rubber Insulators with IEC stipulated test methods

1.7.21Vasudev N, Vynatheya S, Senthil Kumar R K, India

Condition Assessment of in-situ Generator Transformers by Frequency Domain Analysis using Time Domain data

2.7.1Subrata Sarkar, Tarun Sharma, Arijit Baral, Biswendu Chaterjee, Debangshu Dey, Sivaji Chakravorti, India

Control Of Electric Field And Voltage Distribution Of A 765kv System Polymeric Insulator Used In Indian Transmission Systems 3.7.5Kanya kumari, M, Shivakumara Aradhya R. S, Hemanth Jangalwa, India

Curing Kinetics and Dielectric Properties of Epoxy Resin Based Nanocomposites

2.3.1Huichun Zhao, Xianyou Zhang, Zhidong Han, China

D

DC Conduction and Space Charge Properties of SiO2/LDPE Nanocomposite

2.1.3Jiaming Yang, xuan Wang, Changji Zheng, China

Degradation analysis of insulation used in high power transformers by means of Polarization/Depolarization Current (PDC) 2.7.21Doina Elena Gavrila, Ilies Ciprian, Romania

De-noising and Pattern Recognition of Partial Discharges in an Insulator using Wavelet Transform

1.2.5Padma Veerappan, V. Srinivasa Raghavan, India

Denoising Neutral Current of a Power Transformer Measured During Impulse Test by Framelet Technique 2.7.2Ritam Misra, Arijit Baral, Abhijit Lahiri, India

Design of grading ring for 624kV Gapless Zinc Oxide Surge Arrester –

3.2.4Kanyakumari M, Shivakumara Aradhya R. S, Rajaiah B, Kondala Rao S, India

Design Of Optimum Toroid Configuration For The 1200kv System Solid Core Bus Post Insulator -

2.6.4Kanyakumari M, Shivakumara Aradhya R. S, Vikas Khosla, Chaudhari D. B, Kemparaju , India

Determination of temperature distribution and reduction of life of a Dry type three phase transformer

1.5.4Mabel Ebenezer, Rajkumar M. R, Chandramohanan Nair P. S, India



Development of HDPE/Silicon nitride nanocomposites using HDPE-g-Dibutyl maleate as compatibilizer2.3.2

Sailaja R R N, Deepthi M V, Sampathkumaran P, Seetharamu S, Vynatheya S, India

Diagnosis and Identification of Transformer Winding Faults from Frequency Response Data by the Application of ANN Technique 2.4.2Prameela Madala, Radhakrishna Murthy G, Pradeep Nirgude, India

Dielectric characterization using patch antennas

3.5.5Aparna Sheila-Vadde, India

Dielectric Nanocomposites prepared by Gaseous Infusion –

2.3.4Hui L, Keith Nelson, Schadler L. S, Prybyla S G, Vargo T G, Peifer W. R, UK

Dielectric Performance of CaCu3Ti4O12 Ceramics Synthesized by a Simplified Coprecipitation Method

3.4.6Ran Jia, Xue-Tong Zhao, Jian-Ying Li, China

Dielectric Permittivity Characteristic of Mesoporous-Alumina/Epoxy Composite

1.3.3Muneaki Kurimoto, Hidenori Suzuki, Tomohiro Kawashima, Yoshinobu Murakami, Masayuki Nagao, Japan

Dielectric properties of cacu3ti4o12 films synthesis by tape-casting technique

3.6.4Wang Hui, Shengtao Li, Jianying Li, China

Dielectric properties of Poly(methyl methacrylate) (PMMA)/CaCu3Ti4O12 composites

3.4.7P. Thomas, Ernest Ravindran, K.B.R. Varma, India

Dielectric Properties of Silica Hollow Spheres/Epoxy Nanocomposites

1.3.2Hong Zhou, Zhimin Dang, Junwei Zha, China

Dielectric spectra properties of Low-density Polyethylene(LDPE)/Zeolite Nanoscale Composite –

1.7.2Bai Han, Zhi Sun, Dong Zhang, Lin Li, Xuan Wang, Qingquan Lei, China

Differential Time-Domain Spectroscopy Technique Based on Polarization and Depolarization Current and Their Applications in Oil-Paper Insulation Estimation - 1.5.3Jian-Lin Wei, Hao Xu, Guan-Jun Zhang, China

Design of Corona Control Rings For Ehv/Uhv Hardwares

3.2.2Sreenita Chatterjee, Udaya Kumar, India

Dynamic Modelling of a Spark gap Switch

1.7.13Bindu S, Magalvedeker H. A, Sachin Umberker, Archana Sharma, Chakravarti D. P, Saroj P.C, K. C. Mittal, India

E

Effect of coupling agent on PD resistivity of unsaturated polyester –

2.7.13alumina nano-composites – Ram Sharma, India

Effect of different thermal imidization temperature on the properties of PI-EP composites

3.3.4- Yufei Chen, Wei Yue, Zongzhen Bian, China

Effect of Diffusion on Space Charge Formation under Steady-state DC Conditions -

2.7.15Chakradhar Reddy Chandupatla, India

Effect of filler content (ATH filler) on the performance of Silicone Rubber Insulating Material for Different Environmental Stresses by Inclined Plane Tracking & Erosion test 3.3.5Vasudev N, Ganga S, Lalitha Pai B, India

Effect of magnetic field treatment on dielectric properties of LDPE composites filled with carbon nanotube and nano graphite 1.1.4Baozhong Han, Siming Gao, Bingquan Wang, Wei Wang, China

Effect of Nanoparticles Dispersion on Dielectric Properties of Al2O3-Silicon Rubber Nanocomposites –

2.1.2Peihong Zhang, Yong Fan, Xin Ma, China



Effect of Nanoparticles on Tracking Failure of Epoxy/Al2O3 Nanocomposites under DC Stress –1.7.6

Boxue Du, China

Effect of nanosilica on the trap distribution in LDPE/siliananocomposite

1.5.6Jiandong Wu, Li Lan, Yi Yin, Zhe Li, China

Effect of surface modification on the formulation of space charge in LDPE/silica nanocomposite –

2.5.4Yi Yin, Jiandong Wu, Li Lan, Xuguang Li, China

Effects oEffect of Thermal Conduction on Tracking Failure of Epoxy/BN Composite under DC Pulse Stress 1.4.2

Boxue Du, China

Effect of TiO2 and oMMTnanofiller on Thermal Conductivity and Heat Deflection Temperature of Nanodielectrics

1.3.5Rashmi Aradhya, Nijagal Renukappa, M Manjunatha, Kunigal Shivakumar, P Sampath kumaran, India

Effects of Oil Thermal Aged States on the Space Charge Behavior in Oil-paper Insulation

1.4.6Da Wang, China

Electric Field Calculation and Optimization of the UHVDC Converter Valve Shield Case

1.6.2Jianwei Cheng, Zongren Peng, Jialong Wang, China

Electric Field Distribution on Four-Bundle Conductors in 750 kV AC Substation –

1.7.24Jintao Liao, Zongren Peng, Liangxian Zhang, Shiling Zhang, Naiyi Li, Jing Li, China

Electrical aging markers for low-voltage cable insulation wiring nuclear power plants

2.4.6Luca Verardi, Davide Fabiani, Gian Carlo Montanari, Andrea Cavallini, Italy

Electrical degradation due to treeing in nanocomposite dielectric materials with impurities

2.6.3Despoina Pitsa, Michael Danikas, Greece

Electrical Properties of nano-SiO2 and nano-Al2O3 collaborative modified Silicone PSAs3.4.4

Ming Yan Zhang, Ying Li, Zai Fang Li, Peng yu, China

Estimation and Computation of Transfer Function Parameters from FRA Data for Analyzing Transformer Winding Deformation and Displacements 2.4.1Prameela Madala, Sahitya Yadav, Radhakrishna Murthy G, Pradeep Nirgude, India

Evaluation and failure analysis of high-resistance collar coating of varistor

3.2.6Arindam Paul, Seman Saravanan, Nitin Jha, John Yesuraj, Janamejay Nemade, India

Evaluation Of Fire Gases From Polymeric Materials

2.7.5Nageshwar Rao B, Arunjothi R, Srinivasan A. R, India

Experimental Investigation of the Dielectric Strength of Hot SF6 Gas –

3.3.2Philipp Simka, Martin Seeger, Torsten Votteler, Switzerland

Experimental investigations of iso-paraffinic oil for application in high voltage power transformers

3.1.4Umashankar B, Sushil Chaudhari, Anilkumar Bhatia, India

Experimental Study of Insulation Diagnosis Method Based on Analysis of Time-Frequency Domain Dielectric Response 2.2.3Ji Liu, Xinlao Wei, Jing Dai, Ling Huang, China

Experimental Study on Permittivity of Acrylic Dielectric Elastomer –

3.7.8Bipul Pramanik, Raj kumar Sahu, Shovan Bhaumik, Karali Patra, Arvind Pandey, Dipak Setua, India

Experimental Study on the AC Dielectric properties of SiC/LDPE Insulating Non-linear Composite

3.4.5Zhonghua Li, Zhipeng huang, Huan ZHENG, Yu Chen, China

Experimental Study on the Factors Determining the Partial Discharge Resistance of Polymers

1.7.9Yuka Hasegawa, Isamu Ikeda, Yoshimichi Ohki, Japan

Exploration on use of ferrofluids in power transformers



1.5.2Sushil Chaudhari, Shubhangi Patil, Rahul Zambare, India

F

Fabrication and Characterization of Electrospun Composite Materials

1.3.6Shanshan Bian, Shesha Jayaram, Edward Cherney, Canada

Fabrication and characteristics of sub-micrometer vertical type organic semiconductor Copper Phthalocyanine thin film transistor 3.7.10Dongxing Wang, Xiaolin Wang, Changhao Wang, Chao Pang, Jinghua Yin, Hong Zhao, China

Failure analysis of Medium Voltage Cable Accessories during Qualification tests

2.7.8Meena K. P, Thirumurthy, Raja G. K, Nageshwar Rao B, India

Fault prediction based on dissolved gas concentration from insulating oil in power transformer using Neural Network 2.2.2Iyswarya Annapoorani K, B.Umamaheswari, India

Fem Approach To Design Functionally Graded Transformer Bushing

3.7.4Ganga S, Kanyakumari M, Shivakumara Aradhya R. S, India

Field Experiences Using Radio Frequency Scanning (RFS) to Detect Partial Discharge (PD) in Bus Duct and Metal Clad Switchgear of Electrical Generating and Transmission Substations - 3.5.6Javier Enrique Acevedo Acevedo, Colombia

G

Grading Ring Optimization for Tension Porcelain Insulator String on Double Circuit Tension Tower in 1000 kV AC Transmission Lines 3.2.3Xi Yang, Zongren Peng, Jingtao Liao, China

Gram schmiditorthonormalized method for location of partial discharge pulse in transformer windings

1.2.6Jeyabalan Velandy, India

H

High dielectric performance polymer composites based on graphene-TiO2 hybrid1.7.5

Chao Wu, China

I

Impact of Small Voids in Solid Insulating Materials

3.1.7M. Lerchbacher, C. Sumereder, G. Lemesch, F. Ramsauer, M. Muhr, Austria

Improved Performance Of Silicone Rubber Insulation With Nano Fillers

1.3.4Ganga S, Viswanath G. R, Shivakumara Aradhya R. S, India

Impulse Testing of Power Transformer and It's Characteristics

2.7.20Hemant Sawarkar, Ranjana Shing, India

Influence of Compatibilizer on Water Tree Property of Crosslinked Polyethylene/MontmorilloniteNanocomposites 1.3.1Xiufeng Li, Xin Liu, Man Xu, Xiaolong Cao, Darong Xie, Xiaoqiang Wang, Huajun Liu, China

Influence of Organically Modified Montmorillonitenano filler in Epoxy on Electrical and Thermal Degradation of Nanodielectrics 1.1.3Rashmi Aradhya, Nijagal Renukappa, Kunigal Shivakumar, M Manjunath, India

Influence of Surface Roughness on Hydrophobic Stability of Silicone Rubber Composites in Dynamic Drop Test

2.5.5Muneaki Kurimoto, Mohd Arif Bin Mohd Azman, Risyun Kin, Yoshinobu Murakami, Masayuki Nagao, Japan



Inhibition of electrical tree initiation inside high-voltage cross-linked polyethylene cable with nonlinear shielding layer 3.1.1Baozhong Han, Qingqiang Huang, Yang Zhang, Wei Wang, Chuang Zhou, China

Insight into SFRA responses & Interpretations

2.4.7Arun Yargole, India

Insulation Assessment of Transformer Oil Based on Wide Frequency Dielectric Spectroscopy

2.7.3Ji Liu, Jing Dai, Xinlao Wei, China

Insulation degradation in the field aged XLPE Power cable –

1.7.22A key concern for utilities - improvement opportunities – Milind Chavan, Pradeep Shewale, India

Internal Charging in Low Density Polyethylene Irradiated by Energetic Electrons

1.7.16Ni Zhao, Dao-Min Min, Shengtao Li, China

International Specifications of Liquid Dielectrics under use in Power Equipment with a special focus on very high voltage transmission systems and high ambient temperature based tropical countries – 3.3.6Virappa Pattanshetti, India

Interpretation of Recovery Voltage mechanisms in Performance of solid insulation system in power transformer - 2.7.9Aruna.M Kiran, Ravi. K. N, N. Vasudev, India

Interpreting the frequency domain responses of PD signals for location of PD in transformer windings using Statistical and numerical evaluation techniques - 1.2.7Jeyabalan Velandy, India

Investigation of Hydrophobic and optical properties of hfo2 coating on ceramic Insulator

3.6.1Vikramaditya Dave, Hari Om Gupta, Ramesh Chandra, India

Investigation of Lightning Impulse Voltage Characteristics and other Thermo-physical Characteristics of Vegetable Oils for Power Apparatus Applications 3.7.1Dijin Divakaran, Kalaivanan C, India

Investigations on the Suitability of Indigenous Natural Esters as Liquid Dielectrics

3.6.3Nagashree A. N, Vasudeva Murthy S, Champa V, Sumangala B. V, India

K

k - Nearest Neighbor algorithm based classification and localization of seven different types of disc-to-disc impulse insulation failures in power transformer 2.7.7Kunal Ray, Rajamani P, Abhijit Mukherjee, India

M

Measured PD Pulses in Vegetable-Oil-Impregnated Insulation System

1.7.10Wayan Ariastina, Toan Phung, Trevor Blackburn, Indonesia

Microbial growth reduction in tomato juice using electrical pulses

3.6.5Kayalvizhi Sathiyanathan, Gowri Sree Varadarajan, Raji Sundararajan, India

Microscopic Study of the Breakdown Voltage of Solid Insulating Materials under DC and AC conditions

2.7.10Sanjeeb Mohanty, Saradindu Ghosh, Prafulla Chandra Panda, India

Modeling and Simulation Based Study for On-line Detection of Partial Discharge In Solid Dielectric

1.2.3Fasil Vaniyakoly, Susmita Kar, Subrata Karmakar, India

Modeling PD Inception Voltage of Epoxy Resin Post Insulators using Artificial Neural Networks

2.6.2Saradindu Ghosh, Raka Sarkar, Monica Priyadarshini, India

Models For The Estimation Of Life Of Stator Insulation In Large Rotating Machines



1.5.1T.S. Ramu Sastry, B.K.Keshavan Shimoga, Anuradha M

Monte Carlo simulation of secondary electron emission depended on surface charge of space charge of space materials 1.7.23Na Feng, Sheng-Sheng Yang, Yi-Feng Chen, China

N

New Approaches For Transformer Testing On Site And In The Factory Based On Static Frequency Converters 2.4.4Andreas Dipl.-Wirt.-Ing. Horeth, Germany

Novel Solid Insulation system in power transformer

3.3.1Aruna.M Kiran, V. V. Pattanshetti, K. N Ravi, N. Vasudev, India

O

On the thermal breakdown of AC Cables and Transformer Bushings

1.7.11Chakradhar Reddy Chandupatla, India

On-site testing of extruded AC and DC cables above 36 kV and up to 500 kV - Some thoughts about the physics behind it, standards and test techniques 2.4.3Ralf Dr. rer. nat. Pietsch, Andreas Dipl.-Wirt.-Ing. Horeth, Germany

Optimization of corona rings for station post insulators used in EHV/UHV system

1.6.6Gunasekaran Balakamatchi, Pradeep Nirgude, India

P

Partial Discharge Localization in Transformers Using Monopole and Log-Spiral UHF Sensors

3.3.7Herman Sinaga, Australia

Performance Evaluation of Silicone Rubber Composites in the Inclined Plane Tracking/Erosion Test for DC Outdoor Insulation 1.4.1Refat Ghunem, Shesha Jayaram, Edward Cherney, Canada

Performance of capacitor dielectrics during some of the important tests of IEC standards

2.7.19Nagamani H. N, Bhavani Shanker T, Vaidhyanathan V, Neelakantan S, Govinda Rao G, India

Performance of insulation systems for low voltage APFC panels during temperature rise test at elevated ambient temperatures 3.7.2Vaidhyanathan V, Bhavani Shanker T, Govinda Rao G, Nagamani H. N, India

Performance of Telecommunication modules to 0.5µs-100kHz Ring Wave Surges

3.5.4Subba Reddy B, Udaya Kumar, India

Physicochemical Properties Investigation in Nano Sized SiO2 Filled Silicone Rubber for High Voltage Insulation Applications 3.1.6Loganathan Nachimuthu, Chandrasekar Subramaniyam, India

Poly Aryl Ether Ketone based Novel nano composites as dielectric material for power –

3.6.2Virappa Pattanshetti, India

Potential and Electric Field distribution in a Ceramic disc Insulator String with faulty insulators

1.6.5Subba Reddy B, Satish Naik B, Udaya Kumar, Satish L, India

Preliminary Study on Dependence of Space Charge Polarity on Electric Field Intensity of LDPE

2.5.1Peng Ma, Yewen Zhang, Feihu Zheng, Zhenlian An, China

Preparation and Characterization of Modified Multi-walled Carbon Nanotubes-OMMT(organic-montmorillonite)/Epoxy Nanocomposites 3.4.2Ming Yan Zhang, Rui Sun, Zhao Kun Ren, Jin Yu Chen, Shan Sui, China

Preparation and Characterization of Multiferroics BiFeO3



1.1.5Wei Song, Dong Zhang, Zhi Sun, China

Preparation and Characterization of Polymer Blend Nanocomposites

1.7.8Rekha Singh, Ajay pal Indolia, M.S. Gaur, India

Preparation and Electrical Properties of SiOx /LDPE Nano-composites by Mixing Organic Silica Sol and melting LDPE Directly 1.7.1Wenlong Zhang, Yang Du, Juan Mu, China

Preparation and investigation on the properties of mica tape adhesives with zinc oxide whisker addition 3.7.7Li-zhu Liu, Xu Yang, Ling Weng, Jun Ding, Cheng Wang, Feng-chun Wang, China

Preparation of bio-nanocomposites of Chitosan/Thermoplastic starch Reinforced with Multiwalled Carbon Nanotubes

1.7.7Sailaja R R N, Deepthi M V, Ananthapadmanabha G S, Sampathkumaran P, Seetharamu S, Pattanshetti V V, Ganga S, Asai Thambi V

Preparation of High-Dielectric-Constant Ag@Al2O3/Polyimide Composite Films for Embedded Capacitor Applications 1.1.7Li-zhu Liu, Xiao-hui Gao, Ling Weng, Hui Shi, Cheng Wang, China

Preparation, Structure and Crystallization of modified LDH/Polyethylene Nanocomposites

2.1.6Yue Wang, Zhidong Han, China

PVDF/Al sheet nanocomposites with High dielectric constant and high thermal conductivity

1.7.4Liyuan Xie, China

R

Research on Dielectric Loss Characteristic of 550kV AC Resin-Impregnated Paper Oil-SF6 Bushing

3.2.1Wei Hu, Xiongjie Xie, Peng Liu, Zongren Peng, China

Research on Insulation Characteristics of Multi-layers Dielectrics Under Polarity Reversal Based on Field-circuit Coupling Method 1.6.4Liangxian Zhang, Zongren Peng, Jintao Liao, China

Research on Preparation Technology and Properties of mLLDPE/LDPE/CB Composite with PTC

3.7.6Wenlong Zhang, Xu Hu, Weiju Wu, China

Research on the Electric field distribution of Multilayer Dielectric under AC-DC Composite Voltage

2.6.5Jianwei Cheng, Zongren Peng, China

Research on the preparation of LDPE/Fe3O4 composite films and its breakdown strength

1.7.15Dong Zhang, Xuan Wang, Wei Song, Zhi Sun, Bai Han, Jinxin Li, Qingquan Lei, China

Research on the Structure and Electrical Property of PI/MWNTs ternary Hybrid Film

3.4.1Mingyan Zhang, Yuliang Ma, Haixia Chen, Chang Liu, Qiong Wu, China

Research on the trap energy levels in dielectric by non-isothermal PSD

2.7.17Lijuan He, Dawei Li, Haiping Xie, Xuan Wang, Qingquan Lei, China

Resistivity of Pressboard Immersed in Mineral Insulation Oil –

1.7.14Li Huaqiang, China

Root cause analysis of Red color band appeared on multi core MV XLPE insulation

3.7.3Arnab Majumdar, India

S

Simulation Models of transformer hot-spot temperature

1.7.25Huang Xiaofeng, China

Simulation of Pulsed Electro Acoustic Method of Space Charge Measurements3.5.2

Jaspreet Singh Chahal, Chakradhar Reddy Chandupatla, India



Some aspects of location identification of PD source using AE signals by an iterative method

2.2.7Gururaj Punekar, Priyanka Jadhav, Bhavani shanker T, Nagamani H. N, India

Space Charge Accumulation in Epoxy Resin and Polyethylene

2.7.16Supriyo Das, Nandini Gupta, India

Space Charge Characteristics of Epoxy-creped Paper Composites1.4.5

Xin Ning, Zhen Xiang, Shaoqing Chen, Zongren Peng, China

Space Charge Distribution in Oil Impregnated Papers under Temperature Gradient

2.5.3Qingdong Zhu, Kai Wu, Xi Chen, Xia Wang, Yonghong Cheng, Shengtao Li, China

Spectroscopic Analysis Of Tracked Silicone Rubber Insulation

1.2.4Ganga S, Vasudev N, Asaithambi V, Vynatheya S, Viswanath G. R, Shivakumara Aradya R. S, India

Structure Characteristics and Dielectric Properties of PI/MMT Nanocomposite Films

2.1.1Jinghua Yin, Wenbin Bu, Fuqiang Tian, Minghua Chen, Xiaoxu Liu, Guang Li, Yunan Kong, Qingquan Lei, China

Study of high field conductivity property in cross-linked polyethylene

3.1.5Li Lan, Yi Yin, Ulf. H. Nilsson, Hakan Lennartsson Alex Zhou, China

Study of interface behavior on dielectric properties of epoxy-silica nanocomposites

2.1.5Veena Mysore Guruswamy, Renukappa Nijagal Marulaiah, Shivakumar Kunigal N, Seetharamu S, India

Study of the Conductivity of Dielectric under High Energy Electron Irradiation

1.7.12Yifeng Chen, Xiaogang Qin, Shengsheng Yang, China

Study on Curing Process, Surface Strength and Thermal Diffusivity of Epoxy Nanocomposites

1.7.3Feng Xu, Zhidong Han, Haoran Zhou, China

Study on Dielectric and Properties of Epoxy /Multi-walled carbon Nanotubes / Montmorillonite Composites 2.3.3Mingyan ZHANG, Zhaokun REN, Rui SUN, San SUI, Jinyu CHEN, China

Study on Electric Field Distribution of Cage-type Rigid Jumper for 500 kV AC Transmission Lines

1.6.3Haohui Cai, Zongren Peng, Xi Yang, China

Study on Impulse Stress Grading for Stator Winding of HV Explosion-proof Motor

2.6.1Cong Wei, Xuezhong Liu, Xiaosheng Liu, Hongyan Li, Guoqun Tian, China

Study on mechanism and properties of Alcohol-based polyurethane adhesives

3.7.11Yufei Chen Fangliang Li, Jiashan Yin Fangliang Li, Ying Sun Fangliang Li, China

Study on Multi-factor Aging Characteristics of Stator Insulation for Wind Turbine Generator

1.7.20Xiaoxia Ding, Xuezhong Liu, Jianjun Zhang, Tianlong Zhang, Yonggang Bai, China

Study on Preparation and Properties of Polyimide /MWNTs ternary Hybrid Films3.4.3

Ming-yan Zhang, Hai-xia Chen, Yu-liang Ma, Qiong Wu, Chang Liu, China

Study on Surface Modification of Basalt Fiber and Properties of BF/EP-PU Composites

2.7.14Yufei Chen Guangxue Yuan, Yiyue Xiao Guangxue Yuan, Xu Zhang Guangxue Yuan, China

Study on the Pulsed Flashover Characteristics of Solid-solid Interface in Electrical Devices Poured by Epoxy Resin

1.7.17Man-Ping Li, Kai Wu, Zhan-Ping Yang, Man Ding, Xin Liu, Yong-Hong Cheng, Ke Ma, Zepeng Lv, China

Surface Electrical Properties of the Fluorinated Epoxy Resin and Influence of Relative Humidity on Its Surface Conductivity 1.4.4Yaqiang Liu, Zhenlian An, Jun Cang, Feihu Zheng, Yewen Zhang, China

Surface Flashover Characteristics of Modified Polyimide Under DC Voltage in Vacuum

1.4.3Zhen-jun Zhang, Jiang Wu, Jin-feng Wang, Wen-bin Wu, Xiao-quan Zheng, China



Surface flashover of the ATH/epoxy under the nanosecond voltage pulse2.7.12

Qingzhou Wu, Zongren Peng, Yuan Jiang, China

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Measured PD Pulses in Vegetable-Oil-Impregnated Insulation System

W. G. Ariastina1*, B. T. Phung2 and T. R. Blackburn2

1 Department of Electrical Engineering Udayana University

Bali – 80362, Indonesia 2 School of Electrical Engineering and Telecommunications

The University of New South Wales Sydney, NSW – 2052, Australia

*Email: [email protected]

Abstract: Results of PD tests in vegetable oil impregnated insulating system are discussed in this paper. The main objective of the study is to investigate the PD behaviour in the particular insulating systems at elevated temperature. Two different sample arrangements of electrical pressboard and insulating paper were used to simulate insulation defects. The sample was placed in a glass cell and was fully immersed in vegetable oil. The initiated PDs were detected and analysed using a wide band PD detector. The PD waveforms were picked up by means of a HFCT sensor and displayed using a digital oscilloscope. Investigation results show that there are some differences in intrinsic characteristics of PD pulses measured from the two different sample configurations. Keywords: partial discharge, vegetable oil, impregnated insulating system. INTRODUCTION Mineral oil was introduced as a transformer insulating system more than a century ago, and is used extensively at the present time. Besides being an insulating material, transformer oil also functions as a cooling media. Mineral oil is produced by distillation of crude oil, which is obtained by degassing, dehydrating and desalination of the raw product. The characteristics of the mineral oils and their performance during service have been well-documented [1]. Further development in the transformer insulation systems resulted in the introduction of synthetic dielectric liquids, such as PCBs, silicon oils and synthetic ester. Compared to the organic mineral oils, the synthetic oils have several superior properties [2]. However, the main disadvantage in using these oils is negative environmental impact; hence they are not recommended for large utilisation in power systems apparatus. Research into biodegradable oils applications to replace mineral oils has been carried out for more than a decade. The biodegradable oils are usually produced from castor-seed, rape-seed, sunflower-seed or coconut. These vegetable oils have been proof to have less

environmental impacts compare to mineral and synthetic oils. These facts therefore have made the oils been an interesting topic for investigations [3,4,5]. A number of studies to uncover the physical, chemical and thermal characteristics of the vegetable oils have been carried out. A number of experiments to look at interactions between the oils and the cellulose based insulating materials have also been completed [6,7]. Although recent investigations have shown that the vegetable insulation liquids provide promising results for wide applications, a large number of investigations are still required to understand the long time properties and ageing characteristics of these oils, in particular of their impregnated systems. This paper discusses the characteristics of measured PD pulses in pressboard-paper insulation immersed in vegetable oil. The results presented here are further analysis of our previous publications [8,9]. The main objective of the study is to look at the effects of temperature variation to the PD properties. The exploration has been focused to the properties of measured PD pulses in common fault modes of liquid-filled transformers at different temperature. The individual PD pulse was detected using an RF current probe and was displayed in a wideband digital oscilloscope. The measured PD waveforms then are corresponded to the associated PD patterns. PD TEST The test configurations basically simulated a cavity defect within pressboard-paper insulation, as shown in Fig. 1. Trapped air bubbles exist within the void and between sample layers. This arrangement is compared against that without void defect. Details of these arrangements can be seen in [9]. The paper and pressboard samples were impregnated in transformer grade vegetable oil. The two different test configurations are indicated by Test Configuration 1 and 2. Sample arrangement for Test Configuration 1 is shown in Fig. 2. PD tests were carried out at room and at elevated temperature. Further details related to the experimental procedure can be seen in [9].

2012 IEEE 10th International Conference on the Properties and Applications of Dielectric Materials July 24-28, 2012, Bangalore, India

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Fig. 1. Paper and pressboard samples

Fig. 2. Sample arrangement for Test Configuration 1

The PD tests follow procedures according to the IEC-60270 Standard [10]. The typical measurement bandwidth was ~350-650kHz. To facilitate a comparative study of PD characteristics measured using conventional and higher frequency bandwidth, an additional high frequency bandwidth of 500kHz- 1500kHz was also implemented [8,9]. A clip-on RF current probe (HFCT) with a frequency range of ~10kHz–250MHz was used to pick up the radiated high frequency PD current pulse. Discharge pulses picked up by the HFCT were displayed by means of a 500MHz digital storage oscilloscope. The intrinsic discharge characteristics of the individual PD pulse (e.g. pulse rise-time, decay time, frequency content) can be observed accordingly. Note that due to a narrower bandwidth of the HFCT, the measured PD pulses were determined by the bandwidth of the HFCT. Fig. 3 shows the frequency response of the current probe.

Fig. 3. Frequency response of the HFCT [11]

RESULTS AND DISCUSSIONS Test Configuration 1 Fig 4 and 5 show typical measured PD pulses for Test Configuration 1 and at a temperature of 35°C. The figures show fast PD pulses with positive and negative fronts and a wide oscillation on their tails. Each half cycle of the PD pulses consists of multiple peaks with a first peak rise time of about 5 ns. The magnitude of the positive pulse is nearly 150 mV, while that of the negative pulse is slightly higher than 100mV. The associated PD patterns for Test Configuration 1 at 35°C are depicted in Fig 6. Note that Fig 6 shows the PD pattern detected using a frequency bandwidth of 500kHz-1.5MHz. The fast PD pulses then were band limited by the frequency bandwidth of the PD detector. There are somewhat differences between the PD patterns measured using the two different bandwidths. The PD magnitude of the two is relatively similar, however the PD number detected using a higher bandwidth is slightly lower than that detected using a conventional bandwidth [8,9].

Fig. 4. Typical PD pulse at 35°C (Positive front)

Fig. 5. Typical PD pulse at 35°C (Negative front)

Fig. 6. Typical PD pattern at 35°C (500kHz-1.5MHz)

Frequency (MHz)

Gai

n (d

B)

Typical measured PD pulses for Test Configuration 1 and at a temperature of 60°C are shown in Fig 7 and 8. The PD waveforms in these two figures are fairly similar to those depicted in Figs 3 and 4 (at 35°C). The main difference is the magnitude of the pulses. At 60°C, the magnitude increases to 400mV for positive and negative front pulses. Note that the test voltage level and frequency were not changed. It is clear that the magnitude of the PD pulses increases with the temperature. The increase in pulse magnitude is correspondingly indicated by an increase in detected PD distribution as shown in Fig. 9. The PD magnitude at 60°C reaches 1 nC compared to that at 35°C which is only slightly above 300pC. Compared to that at 35°C, the PD number at 60°C is also significantly higher. Detail observation on the test results shows that the PD distributions vary as the temperature increases [8,9].



Fig. 9. Typical PD pattern at 60°C (350-650kHz)

Test Configuration 2 Typical PD pulses for Test Configuration 2 and at a temperature of 35°C are shown in Fig. 10 and Fig. 11.

Compared to that of Test Configuration 1, the front pulses of Test Configuration 2 have fewer ripples. The pulse rise time is approximately 30 ns. The magnitude of the positive pulse is 30 mV, while that of the negative pulse is nearly 50mV. The pulse magnitude is reasonably smaller compared to that of Test Configuration 1. This condition is expected because there is no air-filled void as a discharge source. The PDs are mainly initiated by small trapped air bubbles between insulation layers. Consequently, the associated PD magnitude is also small (Fig. 12). Different PD distributions from those in Configuration 1 are detected due to different sources of PDs. When the test temperature passes 55°C, small air bubbles start to release from the paper-pressboard samples. The number of released air bubbles increases with the temperature. The development of the smaller size of air bubbles thus initiates more small PDs. This fact is indicated by smaller magnitude of measured PD pulses as shown in Figs. 13 and 14.



Fig. 12. Typical PD pattern at 35°C (500kHz-1.5MHz)

An increase in amount of trapped bubbles between sample interfaces initiates tracking path which is further introducing surface discharge. The occurrence of surface discharges is indicated by the detected PD patterns as shown in Fig. 15. Compared to that at 35°C, the PD distribution at 60°C poses a comparatively lower magnitude but a higher repetition rate. CONCLUSIONS Different properties of PD pulses were observed from different test configurations. The characteristic of the pulses changes with the temperature. These facts are confirmed with the detected PD distributions. PD distribution of Configuration 1 differs from that of Configuration 2, due to occurrence of different types of PDs. PD distributions are also changes with temperature indicating a change in how PDs are initiated. The investigation results presented here is still premature and potentially continued. PD mechanisms in aged biodegradable oil-impregnated insulating system may differ from those in new one, thus providing further area of investigations.



Fig. 15. Typical PD pattern at 60°C (350-650kHz)

ACKNOWLEDGMENTS This study was funded by General Directorate of Higher Education, Ministry of National Education, Republic of Indonesia under 2009 Program of Academic Recharging. Research facilities were provided by the University of New South Wales. Special thanks are addressed to Mr. Z. Liu, Dr. K. X. Lai, Mr. H. H. Sinaga, and Mr. W. Yan for sharing their knowledge during fellowship program. REFERENCES [1] T. O. Rouse, “Mineral Insulating Oil in

Transformers”, IEEE Electrical Insulation Magazine, Vol. 14, pp. 6-16, May/June 1998.

[2] D. Kind and H. Kärner, “High Voltage Insulation Technology: Textbook for Electrical Engineers”, Friedr. Vieweg & Sohn Verlagsgesellschaft mbH, Braunschweig, 1985.

[3] T. V. Oommen, “Vegetable Oils for Liquid-Filled Transformers”, IEEE Electrical Insulation Magazine, Vol. 18, No. 1, pp. 6-11, Jan/Feb 2002.

[4] Suwarno, F. Sitinjak, I. Suhariadi, L. Imsak, “Study on the Characteristics of Palm Oil and it’s Derivatives as Liquid Insulating Materials”, Proc. of the 7th Int. Conf. on Properties and Applications of Dielectric Materials, Nagoya, pp. 495-498, Jun 2003.

[5] Jian Li, S. Grzybowski, Yanfei Sun, and Xiaoling Chen, “Dielectric Properties of Rapeseed Oil Paper Insulation”, Conf. on Electrical Insulation and Dielectric Phenomena, Vancouver, pp. 500-503, Oct 2007.

[6] C. P. McShane, K.J. Rapp, J.L. Corkran, G.A. Gauger, J. Luksich, “Aging of Paper Insulation in Natural Ester Dielectric Fluid”, IEEE/PES Trans and Dist Conf and Expo, Vol. 2, pp. 675-679, Oct/Nov 2001.

[7] M. Hemmer, R. Badent and T. Leihfried, “Electrical Properties of Vegetable Oil-Impregnated Paper Insulation”, Annual Report Conf. on Electrical Insulation and Dielectric Phenomena, pp. 60-63, Oct 2003.

[8] W. G. Ariastina, B. T. Phung and T. R. Blackburn, “Partial Discharge Properties in Biodegradable Oil Impregnated Insulation”, Proc. of the 2010 Int. Conf. on Condition Monitoring and Diagnosis, Tokyo, pp. 1231-1234, Sep 2010.

[9] W. G. Ariastina, B. T. Phung, T. R. Blackburn, “Measurement of Partial Discharges in Vegetable Oil-Impregnated Insulating System”, Proc. of the IEEE Tencon 2011, Bali, pp. 545-549, Nov 2011.

[10] IEC-60270, “High-Voltage Test Techniques: Partial Discharge Measurement”, 2000.

[11] Ailtech Division Cutler-Hammer, Instruction Manual for Current Probe Model No. 94430-1, Ailtech Los Angeles Operation, Los Angeles.

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