가속열화에 따른 식물성절연유의 화학적·전기적 특성 분석

최순호(Sun-Ho Choi),정중일(Jung-Il Jeong),허창수(Chang-Su Huh) 대한전기학회 2011 전기학회논문지 Vol.60 No.5

Electrical insulation is one of the most important part in a high voltage apparatus. Recently, researchers are interested in the environmental friendly vegetable oil from environmental viewpoint. Accelerated aging transformer insulating material in vegetable oil was compared to that of mineral oil. Accelerated aging oil samples produced in the oven at 140℃ for 500, 1000, 1500, 2000hours. And Real transformer insulation oils samples of vegetable oil and mineral oil were aged by thermal cycles repeating from 30℃ to 120℃. Samples were analyzed at 42, 63, 93, 143, 190, 240, 300 cycles. The mineral and vegetable insulating oils were investigated for breakdown voltage, water content, total acid number, viscosity, volume resistivity, insulating paper and oil permittivity, and dissolved gas analyses. The breakdown voltage of the vegetable insulating oil is higher than that found for the mineral oil; the accelerated aging progress decreased the breakdown voltage. The vegetable oil had a higher water saturation than the mineral oil; the vegetable oil has the superior water characteristics and breakdown voltage. And high viscosity of vegetable oil, care has to be taken, especially when designing the cooling system for a large transformer.

식물성절연유의 가속열화에 따른 장기적 안정성 분석

최순호(Sun-Ho Choi),허창수(Chang-Su Huh) 대한전기학회 2012 전기학회논문지 Vol.61 No.8

The vegetable-based insulating oils are substitutes for mineral oils in oil-filled transformer. The important properties of vegetable insulating oil is their higher flash/fire point and biodegradability than conventional mineral oils. The large oil-filled transformer eliminate the risk of explosion and fire should the transformer fail and oil ignite owing to high flash/fire point of vegetable insulating oil. In addition, higher biodegradability of vegetable insulating oils can let the oil spill damage reduced. In this experiment, the real oil-filled transformers using mineral oil and vegetable oil have accelerated aging. After working on the 100% accelerated aging experiment were conducted comparing the transformer. The hottest-spot temperature using thermal coefficients were calculated to determin the degree of accelerated aging. As a result, apply mineral oil transformer in accordance with the accelerated aging life come to an end. In contrast, vegetable insulating oils showed the opposite characteristics. Vegetable insulating oil compared to the mineral oil are found to be an long life. As a result, the vegetable oil has a long-term stability.

『동의보감(東醫寶鑑)』중 식물성 기름(油)을 활용한 방제

이부균,Lee, Boo-Kyun 대한한의학방제학회 2020 大韓韓醫學方劑學會誌 Vol.28 No.3

Object : To investigate which diseases the utilization of various vegetable oils were used and how they were used for treatment, and to change and develop vegetable oil combined prescriptions so that the Korean medical treatment effect in clinical practice can be enhanced. Methods : All words containing oil(油) were searched and selected oils used for simple prescription and oil combined prescription. Aii of animal oils such as butter(酥油), Suis oil(猪油), Anceris oil(鴈油), and Actonis caro oil(猯油) were excludIt is suggested to develop a new formulation by succeeding the utilization methods of various effects of sesame oil and other vegetable oils.ed. All selected oils were classified as sesame oil(麻油)(inclusive, 脂麻油, 胡麻油, 香油, 淸油) or other vegetable oils. Result : 1. In 『Donguibogam』(『東醫寶鑑』), 14 other vegetable oils were used to 23 prescriptions. 2. Sesame oil was used to 187 prescriptions over 41 disease categories as of 20 effects described in the 『Zhenghebencao』(『政和本草』). 3. In 28 prescriptions, sesame oil was also used for hygiene and prevention, emetic, preparating herbs and so on. Conclusion : The 101 prescriptions used for medicinal auxiliary materials are due to the efficacy of treatments of malignant furuncles, sores, scabies, promoting regeneration of tissue and flesh, reliving pain, dispersing abscess and swelling and supplementing fissured skin. In 『Donguibogam』(『東醫寶鑑』), the unique efficacy of each vegetable oil and sesame oil was used in various ways and preparation forms to treat various diseases. It is suggested to develop a new formulation by succeeding the utilization methods of various effects of sesame oil and other vegetable oils.

Vegetable Oil Intake and Breast Cancer Risk: a Meta-analysis

Xin, Yue,Li, Xiao-Yu,Sun, Shi-Ran,Wang, Li-Xia,Huang, Tao Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.12

Background: Total fat intake may be associated with increased risk of breast cancer, and fish oil has been suggested as a protection factor to breast cancer. But the effect of vegetable oils is inconclusive. We aimed to investigate the association with high vegetable oils consumption and breast cancer risk, and evaluated their dose-response relationship. Design: We systematically searched the MEDLINE, EMBASE, Cochrane databases, and CNKI updated to December 2014, and identified all observational studies providing quantitative estimates between breast cancer risk and different vegetable oils consumption. Fixed or random effect models were used to estimate summary odds ratios for the highest vs. lowest intake, and dose-response relationship was assessed by restricted cubic spline model and generalized least-squares trend (GLST) model. Results: Five prospective cohort studies and 11 retrospective case-control studies, involving 11,161 breast cancer events from more than 150,000 females, met the inclusion criteria. Compared with the lowest vegetable oils consumption, higher intake didn't increased the risk of breast cancer with pooled OR of 0.88 (95% CIs:0.77-1.01), and the result from dose-response analyses didn't show a significant positive or negative trend on the breast cancer risk for each 10g vegetable oil/day increment (OR=0.98, 95% CIs: 0.95-1.01). In the subgroup analyses, the oils might impact on females with different strata of BMI. Higher olive oil intake showed a protective effect against breast cancer with OR of 0.74 (95% CIs: 0.60-0.92), which was not significant among the three cohort studies. Conclusions: This meta-analyses suggested that higher intake of vegetable oils is not associated with the higher risk of breast cancer. Olive oil might be a protective factor for the cancer occurrence among case-control studies and from the whole. Recall bias and imbalance in study location and vegetable oils subtypes shouldn't be ignored. More prospective cohort studies are required to confirm the interaction of the impact of vegetable oils on different population and various cancer characteristic, and further investigate the relationship between different subtype oils and breast cancer.

친환경 식물성 절연유의 유중가스 분석

최순호,김관식,허창수,Choi, Sun-Ho,Kim, Kwan-Sik,Huh, Chang-Su 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.4

The vegetable insulating oils are substitute for the mineral oil in power transformer. Vegetable insulating oils has higher flash/fire point and biodegradability than conventional mineral oils. In this paper, we investigated the dissolved gas analysis of vegetable oils. In the experiment, I had to accelerated aging under the same conditions mineral oil and vegetable oils. Accelerated aging proceeded to about 100% of the life of oil-filled transformer. In addition, we performed gas analysis of insulating oil of accelerated aging progress. The experiment results of the five gases was measured with the exception of Hydrogen and Acetylene. The mineral oil and vegetable oils gas is generated in a similar tendency depending on the accelerated aging. As a result, vegetable oils, can be dissolved gas analysis by method such as mineral oil.

식물성절연유를 적용한 전력용변압기 차원 온도분포 해석

김철숙(Chul-Sook Kim),차창환(Chang-Hwan Cha),조상문(Sang-Moon Cho),이승호(Seung-Ho Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11

Vegetable oil is the clean insulation oil which has less problem when there is the oil leakage from the transformers due to accidents or explosion of them because the biodegradability of vegetable oil is over 90%. Also it has advantage as noninflammable oil due to over 300℃ flashing point. Even though vegetable oil has many advantages, it has limitations as low cooling performance due to three times higher viscosity than existing mineral oil and poor insulation characteristic caused by high moisture content and water affinity. In this paper, we estimated the cooling performance between the mineral and vegetable oil. In the case of vegetable oil, this could predict that the temperature rise of top oil will increase about 4℃ than that of mineral oil. Also, on the basis of these results we can suggest cooling design to substitute vegetable oil for mineral oil.

Multi-aging Effects on Vegetable Based Oils for Transformer Insulation in HV Systems

Khan Irfanullah,Abid Muhammad Ahtasham,Ullah Kaleem,Ullah Zahid,Haider Aun,Ahmad Farhan Ammar,Zia Zain,Ali Sahibzada Muhammad 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.5

Liquid insulation media is used for insulation and cooling purpose inside the transformer. Currently, transformers are using petroleum based mineral oil, which poses a serious hazardous environmental impact, since the mineral oil is non-renewable and non-biodegradable. Although, the increased cost and depleting nature of mineral oil cause an emergent need to use suitable alternatives to mineral oils that are biodegradable and environmentally friendly. In response to this resource issue, various vegetable oils, namely Sunfl ower oil, Soya bean oil, and a blend of Sunfl ower and Olive (BSO) oil are suitable alternatives for transformer insulation in high voltage systems. The afore-mentioned vegetable oils are subjected to multi-aging and comparative analysis is performed with mineral oil. Further, the dielectric and thermal properties of vegetable oils are tested before and after aging. Fourier Transform Infrared spectroscopy, water content, breakdown voltage, viscosity, fl ash point, tan delta, and pour point tests are performed on vegetable oils before and after aging. Finally, a comparative analysis of vegetable oils with mineral oil is provided to prove the effi cacy of the proposed vegetable oils. The BSO oil resulted in higher breakdown strength and good thermal behavior when subjected to the abovementioned various diagnostic measurement tests in comparison to other oils

과수봉지의 특성 평가(I)

정경모(Kyoung-Mo Jeong),이재훈(Jae-Hun Lee),이태주(Tai-Ju Lee),류정용(Jeong-Yong Ryu),이금남(Kum-Nam Lee) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.5

In this study, physical properties of seven kinds of the conventional pear bag papers and two kinds of the oil coated papers were evaluated. It seemed that air and water vapour permeability of the pear bag paper was influenced by the pore structure of base paper and dried oil film property of the paper surface. It was believed that the pear bag paper sample (the water vapour mass flux: 1.5 mg/cm²/hr) took a relatively long time (225 sec) to measure the air permeability of the paper, when it compared with the pear bag paper sample with 4 mg/cm²/hr. Two kinds of blended vegetable oil were used for oil coating of the base paper (Oil-A: 75 wt% safflower and 25 wt% tung oil; Oil-B: 25 wt% safflower and 75 wt% tung oil). It was found out that because dried oil film property of vegetable oil such as strength, continuous film forming ability was largely influenced by the iodine value of the vegetable oil, two kinds of the oil coated paper with Oil-A and Oil-B showed different results of the air permeability, tensile strength, and burst strength although the same weight of the vegetable oil was applied on the surface of the pear bag paper.

Performance Evaluation of Various Vegetable Oils and Distilled Water as Base Fluids Using Eco-friendly MQL Technique in Drilling of AISI 321 Stainless Steel

Amrit Pal,Sukhpal Singh Chatha,Hazoor Singh Sidhu 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.3

Due to rising attention towards environmental and ecological issues caused by mineral oil-based lubricants in machining operations, the developing of an environmental favourable lubricant has become inevitable. As environmental favourable cutting fluids, vegetable oils have acquired great attention in machining operations due to their good biodegradability, nontoxicity and less environmental pollutant properties. Nowadays, the minimum quantity lubrication (MQL) technique is explored as alternative technique to conventional flood cooling technique. However, very limited work is done to investigate the effect of MQL technique using vegetable oils as the base oil for machining of hard materials. Moreover, systematic comparison of different vegetable oils as the base oil will be of great significance to the manufacturing industry. Therefore, in this study, the performance of six vegetable oils viz. castor, coconut, soybean, canola, palm and sunflower oil, and distilled water has been investigated during drilling of stainless steel (AISI 321) using minimum quantity lubrication technology. The main objective of this study is to compare the performance of various cooling strategies viz. dry, flood and seven MQL conditions with respect to drilling characteristics (thrust force, torque, surface roughness, coefficient of friction (COF), chip morphology and wear mechanism) in the drilling of stainless steel (AISI 321) by using HSS drill tools. Experimental findings showed that MQL drilling conditions have given excellent drilling performance by improving drilling characteristics than dry and flood drilling. Among the MQL fluids, sunflower oil provided better lubrication and improved the drilling characteristics followed by palm, canola, soybean, coconut, castor oil and distilled water. Sunflower oil had a thrust force, torque, surface roughness and coefficient of friction of 1425 N, 22.8 Nm, 4.356 μm and 4.000 μ, which reduced by 21.27%, 25.49%, 30.72% and 5.35%, respectively than that under flood drilling at 30th hole. The better lubrication performance of sunflower oil may be attributed to the rich presence of saturated-fatty acids. In addition, vegetable oils based MQL technique is more worthy to improve the cooling capabilities and promote sustainability in the manufacturing sector by saving resources and extending environmental benefits.

Blending of Soybean Oil with Selected Vegetable Oils: Impact on Oxidative Stability and Radical Scavenging Activity

Li, Yang,Ma, Wen-Jun,Qi, Bao-Kun,Rokayya, Sami,Li, Dan,Wang, Jing,Feng, Hong-Xia,Sui, Xiao-Nan,Jiang, Lian-Zhou Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.6

Background: Soybean oil may protect against cancer of the breast and prostate. It may also exert beneficial influence in combination with other oils. Here, blends (20%, v/v) of sea buckthorn oil (SEBO), camellia oil (CAO), rice bran oil (RBO), sesame oil (SEO) and peanut oil (PEO) with soybean oil (SBO) were formulated. Materials and Methods: Oxidative stability (OS) and radical scavenging activity (RSA) of SBO and blends stored under oxidative conditions ($60^{\circ}C$) for 24 days were studied. By blending with different kinds oils, levels of polyunsaturated fatty acids (PUFA) decreased, while monounsaturated fatty acid (MUFA) content increased. Progression of oxidation was followed by measuring peroxide value (PV), p-anisidine (PAV), conjugated dienes (CD) and conjugated trienes (CT). Results: Inverse relationships were noted between PV and OS at termination of storage. Levels of CD and CT in SBO, and blends, increased with increase in time. The impact of SEO as additives on SBO oxidation was the strongest followed by RBO, CAO, SEBO and PNO. Conclusions: Oxidative stability of oil blends was better than SBO, most likely as a consequence of changes in fatty acids and tocopherols' profile, and minor bioactive lipids found in selected oils. The results suggest that these oil blends could contribute as sources of important antioxidant related to the prevention of chronic diseases associated to oxidative stress, such as in cancer and coronary artery disease.