Optimization of Supercapacitor Assisted Surge Absorber (SCASA) Technique: A New Approach to Improve Surge Endurance Using Air-Gapped Ferrite Cores (2021)
SCASA is a patented technique commercialized as a surge protector device (SPD) that adheres to UL-1449 test standards. Apart from the novel use of supercapacitors, SCASA design incorporates a coupled-inductor wound to a specially selected magnetic material of powdered-iron. In this study, we investigate the limitations of the present design under transient operation and elucidate ways to eliminate them with the use of air-gapped ferrite cores. In modelling the operation under 50 Hz AC and transient conditions, a permeance-based approach is used; in addition, non-ideal characteristics of the transformer core are emphasized and discussed with empirical validations. The experimental work was facilitated using a lightning surge simulator coupled with the 230 V AC utility mains; combinational surge-waveforms (6 kV/3 kA) defined by IEEE C62.41 standards were continuously injected into SPD prototypes during destructive testing. Such procedures substantiate the overall surge-endurance capabilities of the different core types under testing. With regard to optimizations, we validated a 95% depletion of a negative-surge effect that would otherwise pass to the load-end, and another 13–16% reduction of the clamping voltage verified the effectiveness of the methods undertaken. In conclusion, SCASA prototypes that utilized air-gapped cores revealed a greater surge endurance with improved load-end characteristics.</jats:p>
CitationSilva Thotabaddadurage SU, Kularatna N, Steyn-Ross DA (2021). Optimization of Supercapacitor Assisted Surge Absorber (SCASA) Technique: A New Approach to Improve Surge Endurance Using Air-Gapped Ferrite Cores. Energies. 14(14). 4337-4337.
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Keywordssupercapacitors; surge protection; magnetic permeance; air-gapped transformer; effective permeability; SCASA
ANZSRC Fields of Research40 - Engineering::4008 - Electrical engineering::400805 - Electrical energy transmission, networks and systems
40 - Engineering::4008 - Electrical engineering::400807 - Engineering electromagnetics
40 - Engineering::4008 - Electrical engineering::400802 - Electrical circuits and systems
40 - Engineering::4009 - Electronics, sensors and digital hardware::400911 - Power electronics
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Supercapacitor assisted surge absorber (SCASA) technique: selection of magnetic components based on permeance Kokuhennadige S; Fernando J; Kularatna N; Steyn-Ross DA; Silva Thotabaddadurage, Dr. Sadeeshvara (IEEE, 2021)Supercapacitors help building long time constant resistor-capacitor circuits. This property helps them withstand high voltage transient surges and dissipate transient energy in the resistive element of the circuit without ...
Investigating the impact of ferrite magnetic cores on the performance of supercapacitor assisted surge absorber (SCASA) technique Kularatna N; Steyn-Ross DA; Silva Thotabaddadurage, Dr. Sadeeshvara (IEEE, 2019)Supercapacitor assisted surge absorber (SCASA) is a patented technique developed by the University of Waikato. One noticeable attribute of this design is the inclusion of a coupledinductor which improves its capability ...
Permeance based model for the coupled-inductor utilized in the supercapacitor assisted surge absorber (SCASA) and its experimental validation Kularatna N; Steyn-Ross DA; Silva Thotabaddadurage, Dr. Sadeeshvara (IEEE, 2020)Transient-surge absorption capability of small/low cost supercapacitors (SCs) is already published. SCASA is a patented technique that led to the development of a high performance commercial surge protector which adheres ...