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VFTO对就地化保护装置的影响分析及改进措施 被引量:3
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作者 张晓莉 刘慧海 +3 位作者 刘伟 夏烨 庞福滨 艾淑云 《电力系统及其自动化学报》 CSCD 北大核心 2020年第7期137-144,共8页
为解决变电站中特高压气体绝缘金属封闭开关设备GIS(gas insulated switchgear)快速瞬态过电压VFTO(very fast transient over-voltage)对保护装置就地化影响的问题,本文定性分析了GIS操作隔离开关产生的VFTO机理,通过ATP-EMTP仿真定量... 为解决变电站中特高压气体绝缘金属封闭开关设备GIS(gas insulated switchgear)快速瞬态过电压VFTO(very fast transient over-voltage)对保护装置就地化影响的问题,本文定性分析了GIS操作隔离开关产生的VFTO机理,通过ATP-EMTP仿真定量计算了VFTO幅值及分布规律,提出了采用改善一次系统和二次防护配合的方法以降低系统VFTO,提高二次系统的抗干扰能力。一次系统通过增加隔离开关分合闸阻尼电阻、加强接地、降低母线高度降低波阻抗、增加隔离开关分合闸速度等方法降低系统VFTO水平;二次系统通过加强信号防护及电源滤波、优化机箱结构设计与屏蔽设计、将就地装置布置在干扰较低的位置等方法提高二次系统的可靠性。为保护装置就地化可靠运行提供了有效的解决措施。 展开更多
关键词 智能变电站 快速瞬态过电压 就地化 ATP-EMTP 阻抗 保护装置防护 气体绝缘金属封闭开关设备
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Toxicity Symptoms among Migrant Agropesticide Workers in Oman
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作者 Jovita Oyaimare Esechie Olurominiyi Ibitayo +1 位作者 Ihekwoaba Declan Onwudiwe Evaristus Otatade Obinyan 《Journal of Environmental Science and Engineering(B)》 2012年第5期656-662,共7页
The toxicity symptoms among 79migrant pesticide workers involved in open-field pesticide application in Oman were studied. Questionnaires addressing the workers' demographics, pesticide use and practices, use of prot... The toxicity symptoms among 79migrant pesticide workers involved in open-field pesticide application in Oman were studied. Questionnaires addressing the workers' demographics, pesticide use and practices, use of protective devices, disposal of empty containers, storage of pesticides and self-reported poisoning symptoms were administered face-to-face to the workers before commencement of work, during break or at home. A total of 28 toxicity symptoms were reported, skin rash being the symptom reported by a majority of the workers (78%), followed by increased salivation (68%). The gravity of toxicity symptoms was attributed principally to the non-use of protective devices during pesticide spraying. Other factors contributing to poisoning were the workers' poor post-application sanitation habits, improper disposal of empty pesticide containers and storage of partially used pesticides in bedrooms. In order to reduce the incidents of poisoning among the agropesticide workers, there is a need to educate them about the benefits of using PPE (personal protective equipment) and ensuring that they adopt good hygiene and sanitation habits at all stages of pesticide handling. 展开更多
关键词 PESTICIDES toxicity symptoms acute poisoning migrant workers.
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