Power Reactors

Agrawal, K.C.

doi:10.1016/b978-075067351-8/50105-7

Cited by 2 publications

(4 citation statements)

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“…The energy density of a capacitor on a material level is proportional to the dielectric constant times 0022-3727/09/175304+12$30.00 the square of the applied electric field. There is at least one polymer, polyvinylidene fluoride (PVDF), that has a high dielectric constant (8)(9)(10)(11)(12)(13) [5]. However, several other properties of PVDF (dielectric loss and hysteresis) cause high inefficiencies and dielectric heating [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…Blending in high dielectric constant polymers (or ceramic particles) can increase the dielectric constant, but is not expected to increase the breakdown strength because the newly created interfacial area parallel to the applied field is more susceptible to dielectric breakdown [9]. One technique for combining two materials that is used commercially is to stack the two materials forming a two layer structure prior to processing into a wound capacitor [10]. The dielectric in this case is known as a mixed dielectric and typically consists of polypropylene and kraft (or tissue) paper but can also consist of polypropylene and polyester or a number of other polymer combinations [10].…”

Section: Introductionmentioning

confidence: 99%

“…One technique for combining two materials that is used commercially is to stack the two materials forming a two layer structure prior to processing into a wound capacitor [10]. The dielectric in this case is known as a mixed dielectric and typically consists of polypropylene and kraft (or tissue) paper but can also consist of polypropylene and polyester or a number of other polymer combinations [10]. One significant benefit of a mixed dielectric over a standard foil-film arrangement is the ability to withstand higher voltage fluctuations [10].…”

Section: Introductionmentioning

confidence: 99%

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Enhanced breakdown strength of multilayered films fabricated by forced assembly microlayer coextrusion

Mackey

Hiltner

Baer

et al. 2009

J. Phys. D: Appl. Phys.

108

114

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There is a need in electronic systems and pulsed power applications for capacitors with high energy density. From a material standpoint, capacitive energy density improves with increasing dielectric constant and/or breakdown strength. Current state-of-the-art polymeric capacitors are, however, limited in that their dielectric constant is low (2–4). Our approach to improve polymer film capacitors is to combine, through microlayer coextrusion, two polymers with complementary properties: one with a high breakdown strength (polycarbonate) and one with a high dielectric constant (polyvinylidene fluoride-hexafluoropropylene). As opposed to the monolith controls, multilayered films with various numbers of layers and compositions subjected to a pulsed voltage exhibit treeing patterns that hinder the breakdown process. Consequently, substantially enhanced breakdown strengths are measured in the mutilayered films. It is further shown, by varying the overall film thickness, that the charge at the tip of the needle electrode is a key parameter that controls treeing. Based on the acquired data, a breakdown mechanism is formulated to explain the increased dielectric strengths. Using the understanding gained from these systems, selection and optimization of future layered structures can be carried out to obtain additional property enhancements.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced breakdown strength of multilayered films fabricated by forced assembly microlayer coextrusion

Mackey

Hiltner

Baer

et al. 2009

J. Phys. D: Appl. Phys.

108

114

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“…Both circuit breakers which was thermal trip type MCCB were connected in series. 28 Figure 2. shows the experimental setup circuit diagram.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Lifetime estimation and surface degradation of MCCB contact tips due to multiple electrical interruptions

Nag

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper presents the surface degradation analysis of contact tips of commercial (20A, 110 V) molded case circuit breaker due to multiple electrical interruptions during experimental electrical test. In the experimental electric test, and according to the post arc current observation, the arc voltage and current were categorized. Multiple high-current interruption has been identified, and the phenomena that regulate the interruption failure have been established. Also, post-arc current sprinted for a short period of time (10–200 µs) during multiple electrical interruptions. These interruptions cause the failure of the contact tips of MCCB. The metallurgical changes were also observed on the contact tips. The braze joints between contacts tips and copper base is also affected by thermal and electrical conductivity during the electrical interruptions. The optical microscope reveals the typical metallurgical changes that occur during a breakdown, such as surface degradation, wear, cracks adjacent to the braze interface, oxide layer formation, cracks on the contact tips, and cracks that penetrate into the copper base. The experimental investigation of the factors influencing the post arc current was carried out to learn more about the link between the post arc current and the degradation of the interruption characteristics. This investigation’s primary objective is to explore the interruption performance and failure analysis of commercial MCCBs.

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Power Reactors

Cited by 2 publications

References 0 publications

Enhanced breakdown strength of multilayered films fabricated by forced assembly microlayer coextrusion

Enhanced breakdown strength of multilayered films fabricated by forced assembly microlayer coextrusion

Lifetime estimation and surface degradation of MCCB contact tips due to multiple electrical interruptions

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