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HVDC용 모델 케이블의 XLPE 절연체 내부 온도변화에 따른 공간전하 분포 거동 특성 연구
박준도(June-Do Park),김규탁(Gyu-Tak Kim),신수용(Soo-Yong Shin),곽민우(Min-Woo Gwak),황보승(Seung Hwangbo) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
본 연구에서는 HVDC 가교폴리에틸렌(XLPE) 케이블 절연두께 6.8mm에 유도가열을 이용하여 HVDC 케이블 XLPE에 상온 및 섭씨 30도부터 90도까지 고온 상태로 열을 가하고 온도에 따른 XLPE 절연체내의 공간전하 분포를 측정하고 공간전하 분포의 거동 특성에 대해서 연구를 진행하였다. 공간전하 분포 측정은 펄스정전응력법(PEA Method)을 이용하였으며 온도 구간별 공간전하 분포 측정 결과의 시간변화를 토대로 공간전하의 거동 특성을 연구하였다. 본 연구에서는 실제 케이블에 인덕션 코일을 이용하여 컨덕터에 열 유도 및 온도제어를 이용하여 온도변화에 따른 공간전하 분포를 확인하였다.
박준기,김선영,김태윤,최계숙,염두석,강동윤,최승오,박지연,Park, June-Ki,Kim, Sun-Young,Kim, Tae-Yoon,Choi, Kye-Sook,Yeom, Doo-Suk,Kang, Dong-Yoon,Choi, Seung-O,Park, Ji-Youn Korean Society for Radiation Therapy 2008 대한방사선치료학회지 Vol.20 No.1
Purpose: To monitor the changes of location of prostate gland using DIPS and to examine the adjustment and proton beam therapy depending on the movement of prostate gland in proton beam therapy for prostate gland in which a fiducial gold marker was inserted. Materials and Methods: This study was conducted in ten patients with prostate cancer who received proton beam therapy since April of 2008. To monitor the change of prostate location, three fiducial gold markers were inserted prior to the treatment. To minimize the movement of prostate gland, patients were recommended to urinate prior to the treatment, to intake a certain amount of water and to concomitantly undergo rectal balloon. In these patients, the set-up position was identical to that for a CT-simulation. The PA (posterior-anterior) and lateral images were obtained using both DIPS (digital image positioning system) and a plain radiography, and they were compared between the two imaging modalities. Thus, the changes of the location of fiducial gold marker were assessed based on three coordinates (x, y, z) and then adjusted. This was followed by proton beam therapy. Results: Images which were taken using a plain radiography were compared with those which were taken using DIPS. In ten patients, according to a reference bony marker, the mean changes of the location of fiducial gold marker based on an iso-center were X-axis: $\pm$0.116 cm, Y-axis: $\pm$0.19 cm and Z-axis: $\pm$0.176 cm. These ten patients showed a difference in the changes of location of prostate gland and it ranged between RT: 0.04 cm and RT: 0.24 cm on the X-axis; between Inf: 0.03 cm and Sup: 0.42 cm on the Y-axis; and Post: 0.05 cm and Ant: 0.35 cm on the Z-axis. Conclusion: To minimize the movement of prostate gland, as the pre-treatment prior to the treatment. In all the patients, however, three fiducial gold markers showed a daily variation which were inserted in the prostate gland. Based on the above data, Thus, the requirement of gold marker matching system depending on the daily variation in the proton beam therapy for which more accurate establishment of target was confirmed. It is assumed that an accurate effect of proton beam therapy would be enhanced by adjusting the target-center depending on the location change of prostate gland using DIPS which was used in the current study.