On the Mechanism of Aluminum Corrosion in Metallized Film AC Capacitors

Taylor, D. F.

doi:10.1109/tei.1984.298801

Cited by 38 publications

(11 citation statements)

References 1 publication

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“…The combination of its excellent surface sensibility and depth resolution, turns dynamic SIMS depth profiling into a powerful technique for failure diagnosis related to chemical changes within the film capacitors. [5] Due to the characteristics of the sample, and the prospective use of the technique for quality control, special care has been taken in assuring the reliability and reproducibility of the analysis.…”

Section: Introductionmentioning

confidence: 99%

Development of an energy‐resolved method for SIMS in‐depth analysis of metal–polymer interfaces

Téllez

Vadillo

Laserna

2011

Surface & Interface Analysis

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Energy-resolved SIMS depth profiling has been succesfully applied in the analysis of Al-metalized polypropylene films used in the capacitor industry. The accurate identification of the metal-polymer interface was not straightforward due to the simultaneous contribution of isobaric ions coming from each layer ( 27 Al + / 43 AlO + ions from the aluminium layer and 27 C 2 H 3 + / 43 C 3 H 7 + from the polymer substrate). Kinetic energy filtering by means of a 45• electrostatic analyzer (ESA) has allowed the resolution of the metal-polymer interface by selecting a suitable kinetic energy corresponding to the ions generated in the metallized layer but not on the polymer. Owing to the dielectric polymeric substrate, charge effects might be produced during depth profiling. These charge buildup effects are minimized by flooding the surface with low-energy electrons (500 eV) and a specific sample-mounting procedure assuring grounded conditions. The excellent repeatability and sensibility of the technique allows studying the degradative process in the capacitor films and the accurate location of the metal-polymer interface, and therefore, the nanometric metal thickness variations. These factors drastically affect the capacitor's performance and they will determine the potential failures that could be developed during the capacitor's life cycle.

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Section: Introductionmentioning

confidence: 99%

Development of an energy‐resolved method for SIMS in‐depth analysis of metal–polymer interfaces

Téllez

Vadillo

Laserna

2011

Surface & Interface Analysis

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“…The main factor affecting lifetime paper, seems to be corrosion of th External layers on after test1 (210 mt is the total length before sta on after test1 (280 mt is the total length before sta Solution N3 and N6 have electric field and it is interesti in the three tests they had sim least up to a capacitance loss completely differently desi inspection of Solution N3 (Fig 19) Ref [7] continues to explain that t amount of AC voltage, therefore on reduction of the AC electric field str it is proved that the addition of Zn reduce the phenomena. When the metallization the results were compl electrode corrosion would require e impregnated technology.…”

Section: Discussionmentioning

confidence: 99%

Accelerated lifetime testing of energy storage capacitors used in particle accelerators power converters

Boattini

Genton

2015

2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe)

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Energy storage capacitors are used in large quantities in high power converters for particle accelerators. In this application capacitors see neither a DC nor an AC voltage but a combination of the two. The paper presents a new power converter explicitly designed to perform accelerated testing on these capacitors and the results of the tests.Presented at: EPE 2015, 7-10 September 2015, Geneva, Switzerland Geneva, Switzerland October, 2015 Accelerated lifetime testing of energy storage capacitors used in particle accelerators power converters AbstractEnergy storage capacitors are used in large quantities in high power converters for particle accelerators. In this application capacitors see neither a DC nor an AC voltage but a combination of the two. The paper presents a new power converter explicitly designed to perform accelerated testing on these capacitors and the results of the tests.

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“…It has been reported that the capacitance of an aluminum metalized self-healing (SH) film capacitor, which is widely used in large-current applications, is gradually lost through corona discharge due to voltage fluctuations. [10][11][12][13] This phenomenon is commonly observed around the edge of the electrode. Conventionally, AC capacitors are used with an applied voltage lower than that of DC capacitors to avoid the effect of corona discharge.…”

Section: Introductionmentioning

confidence: 92%

Capacitive energy storage and recovery for synchrotron magnets

Koseki

2014

Review of Scientific Instruments

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Feasibility studies on capacitive energy storage and recovery in the main-ring synchrotron of the Japan Proton Accelerator Research Complex were conducted by circuit simulation. The estimated load fluctuation was 96 MVA in total for dipole magnets, which is likely to induce a serious disturbance in the main grid. It was found that the energy stored in the magnets after the excitation period can be recovered to the storage capacitor by controlling the voltage across the energy-storage capacitor using a pulse-width-modulation converter and reused in the next operational cycle. It was also found that the power fluctuation in the main grid can be reduced to 12 MVA. An experimental evaluation of an aluminum metalized film capacitor revealed that capacitance loss was induced by a fluctuating voltage applied to the storage capacitor when applying the proposed method. The capacitance loss was induced by corona discharge around the edges of segmented electrodes of a self-healing capacitor. The use of aluminum-zinc alloy was evaluated as a countermeasure to mitigate the effect induced by the corona discharge. For a zinc content of 8%, which was optimized experimentally, a capacitor with a sufficient life time expectancy of 20 years and a working potential gradient of 250 V/μm was developed.

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On the Mechanism of Aluminum Corrosion in Metallized Film AC Capacitors

Cited by 38 publications

References 1 publication

Development of an energy‐resolved method for SIMS in‐depth analysis of metal–polymer interfaces

Development of an energy‐resolved method for SIMS in‐depth analysis of metal–polymer interfaces

Accelerated lifetime testing of energy storage capacitors used in particle accelerators power converters

Capacitive energy storage and recovery for synchrotron magnets

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