Evolution of stress control systems in medium voltage cable accessories

Strobl, R.; Haverkamp, W.; Malin, G.; Fitzgerald, F.

doi:10.1109/tdc.2001.971348

Cited by 24 publications

(12 citation statements)

References 1 publication

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“…HIGH-VOLTAGE E-field grading [1][2][3][4] is typically implemented via the use of composites with high dielectric constant or composites that possess desirable high field nonlinear resistive behavior. The latter, high field nonlinear resistive field grading composites [4][5][6][7][8][9][10], which serve to avoid excess electrical stress concentrations under both ac and dc applications, are commonly made of an insulating polymer matrix, especially rubber such as ethylene propylene diene monomer (EPDM) or silicone rubber, loaded with conducting carbon black, and/or ceramic semiconductor such as SiC, ZnO, or even an organic semiconductor like polyaniline emeraldine base.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms leading to nonlinear electrical response of a nano p-SiC/silicone rubber composite

Wang

Nelson

Schadler

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

105

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It is well known that hopping of charge carriers via spatially and energetically distributed localized states is a primary transport mechanism in many disordered semiconductors and polymeric dielectrics. In this contribution, the nonlinear I-V physics of a 25vol% 50nm p-SiC/silicone rubber composite for high voltage field grading application was investigated, and a composite bulk hopping mechanism proposed. It is hypothesized that nearest-neighbor hole hopping occurs through thin rubbery layers between the SiC particles, and is the mechanism governing the nonlinear electric response of SiC/silicone rubber nanocomposites.

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Section: Introductionmentioning

confidence: 99%

Mechanisms leading to nonlinear electrical response of a nano p-SiC/silicone rubber composite

Wang

Nelson

Schadler

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

105

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“…and their interaction with the polymer matrix [2,3]. As a spin-off from the metal-oxide varistor technology, microvaristors [4,5] have been developed and are being introduced in new products [6,7]. When used as a functional filler in an insulating or semiconducting matrix the microvaristors can impart their strong electrical nonlinearity directly to the composite.…”

Section: Introductionmentioning

confidence: 99%

“…Unlike today's varistor-type composites, the nonlinear behaviour of the new materials is dominated by the intrinsic bulk properties of the microvaristor particles and is not originating from difficult to control and stabilize particle-particle or particle-polymer-particle contacts [2][3][4][5][6][7][8][9][10]. The response of the filler particles is dictated by their grain boundaries and is transferred directly to the behavior of the composite, as will be shown below.…”

Section: Introductionmentioning

confidence: 99%

Microvaristors: Functional Fillers for Novel Electroceramic Composites

et al. 2004

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Microvaristors are tiny electroceramic particles, which have highly nonlinear, voltage controlled electrical transport properties and can be used as active fillers in a variety of insulating matrix materials for functional composites. Due to the internal grain boundary structure, each individual microvaristor particle shows an IV-characteristics similar to the one known from bulk ceramics, except for the scaled down switching voltage. By controlling the material formulation, the particle morphology and the sintering conditions the switching characteristics of microvaristors can be tailored for specific applications.In the present paper the basic properties of ZnO microvaristors are described and it is shown how they impart their nonlinearity to the composite. A single microvaristor can withstand surprisingly high current loadings, without major changes in their electrical properties. Combined with the high manufacturing flexibility known from polymer processing, the varistor composites can be used for new solutions in overvoltage protection or control of electrical fields.

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“…To decrease force disturbances and the cable mass, the operating voltage of the actuators is increased to above 2000 V. As a result, partial discharges occur during the expected lifetime of an inverter-fed actuator [1]. To ensure that the linear actuators reach their expected lifetime, electric field control methods have to be employed as is performed in cable accessories of medium and high-voltage networks [2][3][4][5] and high-voltage rotating machines [6][7][8]. These electric field control methods mitigate electric field stress and, therefore, ensure the partial discharge inception voltage is above the operating voltage.…”

Section: Introductionmentioning

confidence: 99%

Analysis of electric field control methods for foil coils in high-voltage linear actuators

Beek¹,

Jansen²,

Lomonova³

2015

Archives of Electrical Engineering

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This paper describes multiple electric field control methods for foil coils in high-voltage coreless linear actuators and their sensitivity to misalignment. The investigated field control methods consist of resistive, refractive, capacitive and geometrical solutions for mitigating electric stress at edges and corners of foil coils. These field control methods are evaluated using 2-D boundary element and finite element methods. A comparison is presented between the field control methods and their ability to mitigate electric stress in coreless linear actuators. Furthermore, the sensitivity to misalignment of the field control methods is investigated.

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Evolution of stress control systems in medium voltage cable accessories

Cited by 24 publications

References 1 publication

Mechanisms leading to nonlinear electrical response of a nano p-SiC/silicone rubber composite

Mechanisms leading to nonlinear electrical response of a nano p-SiC/silicone rubber composite

Microvaristors: Functional Fillers for Novel Electroceramic Composites

Analysis of electric field control methods for foil coils in high-voltage linear actuators

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