The Experts below are selected from a list of 792 Experts worldwide ranked by ideXlab platform

K. Haga - One of the best experts on this subject based on the ideXlab platform.

  • Creepage breakdown characteristics of printed wiring board in silicone gel
    Proceedings of Conference on Electrical Insulation and Dielectric Phenomena - CEIDP '96, 1996
    Co-Authors: T. Maeda, K. Haga
    Abstract:

    We measured the Creepage breakdown characteristics of printed wiring boards in silicone gel in three types of specimens, one each with and without a background electrode, and one with a background electrode but without a surface earth electrode. The relationship between Creepage breakdown voltage and Creepage Distance was obtained for the specimens with a surface earth electrode and with and without a background electrode. The breakdown voltage of the specimen without a surface earth electrode was separated into substrate surface perimeter and substrate side components.

  • Creepage breakdown characteristics of printed wiring board in silicone gel
    Proceedings of 1995 International Symposium on Electrical Insulating Materials, 1995
    Co-Authors: T. Maeda, K. Haga
    Abstract:

    We measure the Creepage breakdown characteristics of printed wiring boards in silicone gel and obtain an experimental equation. This equation allows us to consider separately the different factors (Creepage Distance, intrinsic capacity, relative permittivity, insulation layer thickness and electrode location) affecting breakdown voltage. Further, we are able to predict accurately the breakdown limit of insulation in two planes.

K. Pointner - One of the best experts on this subject based on the ideXlab platform.

  • Ceramic and hybrid support insulators for UHVDC systems
    Elektrotechnik Und Informationstechnik, 2017
    Co-Authors: G. Goedel, Michael Muhr, J. M. George, K. Pointner
    Abstract:

    The requirements for UHVDC installations in terms of length, mechanical strength, permissible deflection, Creepage Distance, shed profiles and pollution resistance are still a challenge for all existing technologies and solutions. Based on the positive long time experience with solid core porcelain post insulators and the pollution experience of insulators with silicone housings the fundamental concept of both were used to develop a new type post insulator with inside ceramic core and housing of silicone. The challenge was to provide a reliable and economical solution, which combines the advantages of both technologies.

  • Ceramic and hybrid support insulators for UHVDC systems
    e & i Elektrotechnik und Informationstechnik, 2017
    Co-Authors: G. Goedel, Michael Muhr, J. M. George, K. Pointner
    Abstract:

    The requirements for UHVDC installations in terms of length, mechanical strength, permissible deflection, Creepage Distance, shed profiles and pollution resistance are still a challenge for all existing technologies and solutions. Based on the positive long time experience with solid core porcelain post insulators and the pollution experience of insulators with silicone housings the fundamental concept of both were used to develop a new type post insulator with inside ceramic core and housing of silicone. The challenge was to provide a reliable and economical solution, which combines the advantages of both technologies. Realising the needs for high strength, low deflection under load for many applications PPC Insulators Austria began the development of hybrid post insulators. The ceramic solid core design provides superior advantages in terms of bending strength, also for torsion load and compression load. The silicone rubber housing allows thinner sheds and greater Creepage Distances, provides improved long term pollution flashover performance and protects the core from short circuit arc damage. As design for DC hybrid post insulators was chosen upright tapered, uniform and underhung tapered insulators columns stacked of single hybrid insulator sections. The single sections could be varied in core diameter, length, Creepage Distance, fittings and holepattern. The shed profile used for DC applications was defined according the recommendations given by CIGRE. Selected design tests, electrical and mechanical type tests were conducted according to the relevant parts of IEC standards for composite and ceramic insulators. Also a long term test installation was performed to establish a confidence in this product. The long term test installation has been energized at 725 kV DC and later the voltage was increased to 761 kV DC. The tests have served well in providing final qualification. Beside these voltage tests measurements of ESDD/NSDD, hydrophobicity and also visual inspections were carried out. The mechanical properties were driven from the seismic requirements and have been calculated by finite element modelling of the reactor and its support structure. For post insulators with silicone rubber sheds and with solid core porcelain may be the most stable solution and this type has been adopted in different 800 kV projects. One of the new insulator was chosen for smoothing reactor support for 800 kV DC system in India.

T. Maeda - One of the best experts on this subject based on the ideXlab platform.

  • Creepage breakdown characteristics of printed wiring board in silicone gel
    Proceedings of Conference on Electrical Insulation and Dielectric Phenomena - CEIDP '96, 1996
    Co-Authors: T. Maeda, K. Haga
    Abstract:

    We measured the Creepage breakdown characteristics of printed wiring boards in silicone gel in three types of specimens, one each with and without a background electrode, and one with a background electrode but without a surface earth electrode. The relationship between Creepage breakdown voltage and Creepage Distance was obtained for the specimens with a surface earth electrode and with and without a background electrode. The breakdown voltage of the specimen without a surface earth electrode was separated into substrate surface perimeter and substrate side components.

  • Creepage breakdown characteristics of printed wiring board in silicone gel
    Proceedings of 1995 International Symposium on Electrical Insulating Materials, 1995
    Co-Authors: T. Maeda, K. Haga
    Abstract:

    We measure the Creepage breakdown characteristics of printed wiring boards in silicone gel and obtain an experimental equation. This equation allows us to consider separately the different factors (Creepage Distance, intrinsic capacity, relative permittivity, insulation layer thickness and electrode location) affecting breakdown voltage. Further, we are able to predict accurately the breakdown limit of insulation in two planes.

A Haddad - One of the best experts on this subject based on the ideXlab platform.

  • Control of leakage-current and power dissipation by surface texturing of silicone rubber insulators
    2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), 2016
    Co-Authors: M. Albano, R.t. Waters, A Haddad
    Abstract:

    Partial arcing of external insulation in polluted environments is substantially reduced for composite structures with polymeric housings compared with ceramic insulators and bushings. However, loss of surface hydrophobicity combined with heavy deposits of saline or other conductive compounds negate this advantage and risk tracking or erosion. It is shown that mitigation of this risk is provided by moulded surface textures that increase the form factor and effective Creepage Distance of the insulation. Inclined-plane and fog testing are used to quantify the reduction of leakage-current and power dissipation.

  • Comparative performance of 11kV silicone rubber polymeric insulators under Rotating Wheel Dip Test
    Proceedings of the Universities Power Engineering Conference, 2014
    Co-Authors: A. S. Krzma, Michele Albano, A Haddad
    Abstract:

    This paper presents an experimental study of silicone rubber polymeric insulators for 11kV systems using a Rotating Wheel Dip Test (RWDT) based on IEC 62730:2012. The primary aim of this study is to compare the aging performance of polymeric insulators under AC voltages. Different insulator designs are investigated. A conventional polymeric insulator design has been adopted and compared with insulators having a textured surface. Textured surfaces have been developed by Cardiff University to increase the Creepage Distance and improve tracking/erosion performance. The results of long term testing are obtained; during the test cycle, and both voltage and current traces were acquired continuously. A number of parameters were then calculated during the post processing stage. These parameters include peak values, accumulated absorbed energy, power consumption and power factor angle. Using these parameters allows direct comparison between different insulator designs. In particular, the magnitude and shape of leakage current and the accumulated absorbed energy on the insulator surface were examined to characterise each insulator. Furthermore, continuous monitoring of the shed surfaces and the insulator trunk using an IR camera were undertaken to evaluate the temperature distribution along the surface profile. In addition, hydrophobicity tests were performed before and after completion of the test to evaluate the degradation level of the insulator surface and its material.

  • Principles ofAnti-Fog Design forPolymeric Insulators
    2007
    Co-Authors: A Haddad, H. Griffiths, T. Waters
    Abstract:

    Electric field andleakage current density in theshankregion ofapolluted polymeric insulator may causelocal dry-banding, witha riskoflong-term degradation frompartial-arc discharges. Ina novel approach todry-band control, thecharacteristics of silicone rubbersurfaces witha textured finish are investigated and,depending onthegeometry chosen for thetexture, twouseful objectives canbeachieved. First, theincrease ofsurface areacanbothreduce theleakage current density inthevulnerable shank region, andalso increase thelongitudinal Creepage Distance. Secondly, thedamagearising fromsurface discharges canbe mitigated. Theprinciples oftheproposed anti-fog design aredescribed indetails, andpreliminary results fromtests whichshowanimprovement inperformance arepresented.

Hussein Ahmad - One of the best experts on this subject based on the ideXlab platform.

  • Study of Creepage Distance of the contaminated insulator in correlation with salt deposit density
    2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132), 2000
    Co-Authors: Abdus Salam, Hussein Ahmad, A.s. Ahmad, S.a. Fuad, K.c. Paul, T. Tamsir, Zolkafle Buntat, Mohamed Afendi Mohamed Piah
    Abstract:

    For design purposes, the specific knowledge about the Creepage Distance of the insulator for the contaminated environment is important. This can be done easily if the mathematical relationship between the Creepage Distance and Salt Deposit Density (SDD) is known. In this paper, a relationship between the Creepage Distance of the insulator and SDD has been proposed using the Dimensional Analysis technique. The results calculated from the proposed expression are compared with other results and found to be in close agreement.

  • Derivation of Creepage Distance in terms of ESDD and diameter of the contaminated insulator
    IEEE Power & Energy Magazine, 2000
    Co-Authors: M. Abdus Salam, Hussein Ahmad
    Abstract:

    In designing EHV transmission systems, specific knowledge about the Creepage Distance of the insulator, which is subjected to adverse environmental contamination, is important. Various system components' configurations can be properly coordinated through the appropriate application of the relationship between insulator Creepage Distance, the equivalent salt deposit density (ESDD), and the insulator diameter. In this paper, a general relationship between the Creepage Distance, ESDD, and diameter of the insulator has been proposed using the dimensional analysis technique.