Volume 2 • July-2016
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Editorial
Jerome Castellon;Serge Agnel;Jean-Charles Laurentie;Petru Notingher
Publication Year: 2016,Page(s):iii - iv
Electrical breakdown of epoxy and PTFE under dc conditions
Publication Year: 2016,Page(s):1 - 4
Cited by: Papers (3)
The dc breakdown strength of an epoxy resin and of polytetrafluorethylene containing mineral fillers is investigated in order to consider their use in high voltage dc applications. Results obtained at temperatures between 25°C and 85°C with voltage rates from 0.2 kV/s to 8 kV/s are presented and analyzed. The performance and the behavior of the materials are discussed.Show More
Methanol and furan detections in a gas to liquid hydrocarbon oil for indicating cellulose insulation ageing
S.Y. Matharage;Q. Liu;Z.D. Wang;Ch. Krause;P.W.R. Smith;P. Mavrommatis
Publication Year: 2016,Page(s):601 - 604
Cited by: Papers (3)
Ageing assessment of cellulose insulation in a transformer is normally conducted through indirect measurements of chemical markers in oil. In addition to the conventional paper ageing indicator 2-FAL, methanol in oil was proposed as an additional indicator to provide early ageing information. Relationships between the paper ageing and the concentration of the indicators in oil could be affected by...Show More
Design criteria for inverter-fed Type 1 motors
Luca Lusuardi;Andrea Cavallini;Paolo Mancinelli;Gomez De La Calle Manuel;Juan Manuel Martínez-Tarifa;Guillermo Robles
Publication Year: 2016,Page(s):605 - 608
Cited by: Papers (21)
According to the IEC 60034-18-41, the reliability of inverter-fed motor electrical insulation must be assessed through qualification tests with stress levels based on empirical assumptions. For purely organic (Type 1) electrical insulation systems, the inception of partial discharges within the insulation systems is the end-life criterion. The aim of this paper is to start a work in the direction ...Show More
Change in partial discharge resistance of epoxy/Al2O3 nanocomposites irradiated with high energy electron beam
Publication Year: 2016,Page(s):609 - 612
Cited by: Papers (2)
Epoxy-based nanocomposites working in the irradiation environment could be exposed to a great risk of degradation induced by partial discharge. It is then of necessity to investigate the effect of irradiation on the resistance to partial discharge of epoxy nanocomposites. In this paper, epoxy/Al2O3 nanocomposites have been prepared to estimate the influence of electron beam on the erosion of parti...Show More
The experimental investigation and numerical simulation of self-healing in metallized film capacitors
Publication Year: 2016,Page(s):613 - 616
Cited by: Papers (13)
Metallized film capacitors have an ability to withstand the breakdown of dielectric film due to a “self-healing” feature. The optimal design of metallized electrodes' patterns guarantees high reliability of metallized film capacitors. This paper presents the results of numerical simulation of the intersegment gate current destruction during self-healing by means of COMSOL Multiphysics software. Th...Show More
Correlation analysis between crystalline behavior and aging degradation of insulating paper
Qiang Fu;Jing Zhang;Mengjun Wang;Tiansheng Chen;Jian Li;Feipeng Wang;Xi Li
Publication Year: 2016,Page(s):617 - 620
Cited by: Papers (6)
The insulating paper in the transformer undergoes degradation during operation. Condition monitoring and assessment for insulating paper is of great significance as the life of insulating paper mainly determines that of transformers. Accelerated thermal aging experiments were performed for insulating papers at 120°C and 130°C, respectively. The crystallinity index of insulating paper was calculate...Show More
The aging characteristics of the Nomex paper for the flameproof dry-type transformer
Publication Year: 2016,Page(s):625 - 629
Cited by: Papers (1)
The insulation system of a flameproof dry-type transformer under the combined thermal, electrical, mechanical, and environmental stresses undergoes gradual deterioration, which ultimately leads to transformer failure. It is hence important to test the aging characteristics of the Nomex insulation paper (aramid paper) which is the main insulation material of the flameproof dry-type transformer. In ...Show More
Corona aging and hydrophobicity of surface fluorinated silicone rubbers
Yujiao Tang;Zhenlian An;Fangting Shan;Feihu Zheng;Yewen Zhang
Publication Year: 2016,Page(s):630 - 633
Cited by: Papers (3)
We have reported that hydrophobicity of silicone rubber (SIR) can be significantly enhanced by direct fluorination. In this work, surface fluorinated SIR samples, together with the unfluorinated (virgin) ones were corona treated using a multi-needle-to-plate electrode system, to further evaluate corona resistance of the fluorinated SIR layer. ATR-IR analyses suggest that there may be oxidation of ...Show More
Breakdown strength of impregnated capacitor elements
Publication Year: 2016,Page(s):634 - 637
Cited by: Papers (3)
The dielectric strength of unaged and aged capacitor elements is described using a 2-parameters Weibull statistical analysis. The experimental results suggest that aged elements can be split in two populations. The electric stress at the electrode edge is shown to be an important parameter regarding the decrease of dielectric strength. A threshold value of the stress in this area was determined fr...Show More
Prediction of PDIV in motor coils using finite element method
Stéphane Duchesne;Guillaume Parent;Julien Moenecley;Daniel Roger
Publication Year: 2016,Page(s):638 - 641
Cited by: Papers (11)
The aim of this paper is the presentation of a method allowing the prediction, at the design phase, of the Partial Discharges Inception Voltage (PDIV) in motor coils made with classical enameled wire. The method is based on the comparison of electrical potential values - obtain with a Finite Element simulation - with those given by the Paschen's laws for the same inter-electrode gap. The originali...Show More
Effect of water vapor on oil-contamination discharge of stator windings
Lingyan Lin;Ailiang Kang;Jiancheng Song;Zhipeng Lei;Yu Zhao;Arnd Isenberg
Publication Year: 2016,Page(s):642 - 645
Cited by: Papers (2)
It is a common phenomenon for high voltage (HV) motor that bearing bush leaks oil during operation. The oil contamination will etch stator windings and dissolve the ground-wall insulation, make the insulation and wire stratified, reduce the strength of insulation, and finally lead to partial discharge (PD). In addition, water vapor will make the condition worse. Contamination or water vapor covere...Show More
Terahertz spectroscopic diagnosis of degradation of ethylene-propylene-diene copolymer
Publication Year: 2016,Page(s):646 - 649
Flame-retardant ethylene-propylene-diene copolymer (FR-EPDM) with the same additives as those used in nuclear power plants was analyzed by terahertz (THz) and infrared (IR) absorption spectroscopy, before and after the irradiation by γ-rays. As a result, it has become clear that THz spectroscopy can indicate the degradation of the FR-EPDM samples better than IR spectroscopy. Namely, the THz spectr...Show More
Ageing study on enameled magnet wires through statistical analysis of conventional partial discharge magnitudes and repetition rate
Publication Year: 2016,Page(s):650 - 653
Cited by: Papers (2)
As a result of the use of inverted-fed drives, enameled magnet wires of induction motors are suffering from partial discharge (PD) activity. This is a clear ageing mechanism for the machines which leads to unexpected failures in these systems. Ageing characterization of this insulation system is essential for these applications. In this paper, several statistical PD quantities which account for PD...Show More
Risk assessment of oil impregnated pressboards using the statistical distribution of partial discharge before breakdown
Publication Year: 2016,Page(s):654 - 657
Oil-cellulose insulation system is used widely in electric power transformers. Partial discharges (PD) are considered to be important to destroy the oil-impregnated pressboard insulation system. Many types of defects can lead to PDs. At the same time, PDs gradually destroy the pressboard, product conductive channels in it. Until now, it is still very difficult to diagnosis the severity of the defe...Show More
The impact of harmonics on the V − I characteristic of ZnO varistors
Publication Year: 2016,Page(s):658 - 661
Cited by: Papers (4)
The continued presence of harmonic frequencies in modern power systems raises the fundamental question of suspected aggravation of ageing or degradation process of zinc oxide (ZnO) varistors under constant operating voltage mode. In this study, the long-term effect of power system harmonics on the ageing of ZnO varistor samples is analysed on the basis of the reference or the varistor voltage and ...Show More
Estimating aging parameter of XLPE and its nanocomposites under AC voltage using step-stress test
Publication Year: 2016,Page(s):662 - 665
Cited by: Papers (1)
Our previous studies showed that the aging parameter, i.e. the n-value, of XLPE was quite different from that of XLPE nanocomposites. In order to investigate the effects of space charge on aging parameter under DC voltage, the n-values of XLPE and its nanocomposites were measured under AC voltage in this report, because few space charge exits in the sample under AC voltage. Step-stress tests were ...Show More
Investigation into the dissipated energy under accelerated thermal aging in PVC/B used in low-voltage cables insulation
Publication Year: 2016,Page(s):666 - 669
Cited by: Papers (7)
Due to their excellent insulating characteristics, polymer materials are widely used in electric power transmission and power cables. However, the thermal stress is one of the most severe service constraints that can lead to the reduction of insulating polymers lifetime. In light of this, an experimental study on polymer samples was carried out to investigate the impact of the accelerated thermal ...Show More
Analysis of localized dissipation factor measurements on the insulation system of mechanically aged generator stator bars
Alessandro Cimino;Christian Foelting;Frank Jenau;Christian Staubach
Publication Year: 2016,Page(s):674 - 677
Cited by: Papers (5)
Integration of decentralised renewable energy sources lead to an increasingly fluctuating load profile of power engineering equipment. In particular, on large rotating machines this changing load profiles continuously stress the insulation in form of mechanical and thermo-mechanical forces. Eventually, a mechanical overstressing can ultimately result in an electrical breakdown of the insulation. T...Show More
AC corona resistance performance of silicone rubber composites with micro/nano silica fillers
Publication Year: 2016,Page(s):681 - 684
Cited by: Papers (17)
Silicone rubber (SR) insulating surfaces are often subjected to corona partial discharges (PD) during outdoor operation which can change the surface chemistry significantly and result in considerable surface deterioration, hydrophobicity loss, and enhancement of PD activity. In this work, the effect of micro and nano-fillers addition on surface degradation of SR under AC corona discharge is examin...Show More
Role of electrostriction on the electrical aging of polymers
Publication Year: 2016,Page(s):685 - 688
Cited by: Papers (1)
It is shown that the major parameters affecting most electrical properties of dielectrics, especially aging, are more poorly known than believed. This paper points out three major problems: the real values of the field-induced stress and strain, the strain saturation under high fields and the exact role of the sample size. One mechanism allowing to take those difficulties into account is electrost...Show More
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