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태양광 직류 전로 사고 실증실험을 통한 태양광 단락사고 특성
조성구(Cho Sung-Koo),정도연(Jung Do-Yun),김재현(Kim Jae-Hyun),김지연(Kim Ji-Yeon),김준태(Kim Jun-Tae) 한국태양에너지학회 2022 한국태양에너지학회 논문집 Vol.42 No.5
The rapid development of the solar industry over the past several years has expanded the significance of photovoltaic (PV) systems. Fault analysis in photovoltaic arrays is a fundamental task to increase reliability, efficiency, and safety in PV systems. If no fault is detected, it may reduce power generation, accelerate system aging, and increase the risks of fire hazards. In this study, we considered the line–line fault through verification experiments in PV arrays for fire hazard analysis and analyzed accident characteristics to improve electrical safety in PV systems. This paper presents a comparison and analysis of accident characteristics regarding the location of the accident, use of blocking diodes, and PV inverter operation. String line–line fault protection in systems without blocking diodes should be designed considering the current acceptable ratings of all facilities in the path, from the combiner box to the PV module. In addition, the array line-line fault characteristics include short-circuit current from the solar array and back feed current from the inverter based on the accident point. These accident currents contribute to fire accidents with strong arcs from the short-circuit point.
송규민 ( Kyu Min Song ),윤세훈 ( Sei Hun Yun ),정흥석 ( Hong Suk Chung ),장민호 ( Min Ho Chang ),강현구 ( Hyun Goo Kang ),조승연 ( Seung Yen Cho ),구대서 ( Dae Seo Koo ),정도연 ( Do Yeon Jeong ),정동유 ( Dong You Jung ) 한국공업화학회 2010 응용화학 Vol.14 No.1
A rectangular type-bed of tritium storage was designed, fabricated and inspected. The storage bed was fabricated by brazing the tray plate, heater tube and helium loop. Brazing enables improved heat transfer for heating and cooling the plates. Feed through connections of the heater line and thermocouple line of the primary vessel enable the prevention of tritium leakage into the secondary vessel. The circumferential thermal reflectors and circular plate-type thermal reflectors for the primary vessel were fabricated to reduce heat transfer from the primary vessel to the secondary vessel, and thermal loss. Vacuum & leak inspections on the primary & secondary vessels for the fabricated rectangular tray-type bed were performed. These results were proved to have no leaks on the tubes of the primary & secondary vessels.