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分裂变压器分支零序保护误动案例分析及改进校验方法
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作者 曹美龙 《能源与环境》 2018年第5期29-30,32,共3页
对一起分裂变压器保护误动案例分析表明:低压侧2个分支的零序一、二次电流回路不对应接线常导致分支零序保护误动作。分析现场不对应接线的主要原因,总结通常采用的静态校验法和短路法的优点与不足。在此基础之上,提出了改进的校验方法... 对一起分裂变压器保护误动案例分析表明:低压侧2个分支的零序一、二次电流回路不对应接线常导致分支零序保护误动作。分析现场不对应接线的主要原因,总结通常采用的静态校验法和短路法的优点与不足。在此基础之上,提出了改进的校验方法,可同时满足检验的准确性、经济性和安全性。结合一次设备绝缘试验和二次设备通流试验提出了检验技术要点,并给出测试结果的逻辑判断方法。最后,介绍本校验方法的现场实施情况并对其产生的经济效益进行了分析。校验方法在现场的成功运用证明了其可行性和正确性。 展开更多
关键词 分裂变压器 分支零序保护 误动案例 校验方法
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Misdiagnosed coronary artery disease-acute aortic syndrome: A case report 被引量:2
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作者 Xiao-Yu Zhou Jing Xu 《Chinese Journal of Traumatology》 CAS CSCD 2018年第4期243-245,共3页
It is estimated that 15% of traffic accidents cause trauma to large vessels. In about 70%-95% of cases, aortic rupture took place in the distal ligament of the left subclavian artery, whereas in the remaining cases ru... It is estimated that 15% of traffic accidents cause trauma to large vessels. In about 70%-95% of cases, aortic rupture took place in the distal ligament of the left subclavian artery, whereas in the remaining cases rupture occurred in the ascending aorta above the aortic valve. Trauma to the aortic sinus and coronary arteries is rarely found in traffic accident victims. Therefore, coronary artery trauma is often misdiagnosed as coronary atherosclerotic heart disease. The present case is a 42 years old male who survived from a traffic accident. He presented with aortic sinus and left coronary artery trauma. He was misdiagnosed as having coronary atherosclerotic heart disease, and therefore wrongly given antiplatelet medicine, such as aspirin, in another hospital. Definite diagnosis was achieved in our hospital, and the patient underwent Bentall and mitral valve replacement, as well as tricuspid valvuloplasty. The aortic occlusion time during surgery was 47 min, and the total cardiopulmonary bypass time was 63 rain. After surgery, transthoracic echocardiography confirmed that all the artificial valves worked sufficiently. The patient felt good and symptoms such as asthma and decreased exercise tolerance disappeared. This case taught us that acute aortic syndrome cannot be ignored when patients present with pectoralgia; antiplatelet medication should not be given before definite diagnosis. 展开更多
关键词 Acute aortic syndrome Chest trauma Traffic accidents
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