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模糊粗糙集数据挖掘方法在电力变压器故障诊断中的应用研究--基于油中溶解气体的分析诊断 总被引:9,自引:0,他引:9
将电力变压器故障历史数据首先进行模糊化及离散化处理,然后构建故障诊断决策表,以决策表作为主要工具,即"知识库",采用粗糙集数据挖掘方法直接从决策表中提取出潜在的诊断规则,为电力变压器提供有效的故障诊断. 相似文献
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SF6/N2和SF6/CO2的绝缘特性及其比较 总被引:4,自引:0,他引:4
介绍在E/P值为26.3~94.0KV/mmMPa的范围内采用稳态汤逊法(SST)测量SF6/N2和SF6/CO2的电离系数α和吸附参数η,求出了各混合比下的SF6/N2,SF6/CO2的临界耐电强度值(E/P)lim,并分析了两种混合气体的绝缘特性。 相似文献
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The polarization and absorption principle of corona virus in the electric field is presented. It is expressed by the mathematic differential equation based on the physical model. According to the parameters of the dipole moment of virus, the electric field force exerted by the external electric field can be calculated. According to the parameters of size, mass and elastic modular, etc. , the moment of inertia of virus can be calculated. According to the viscosity of tissues, the resistant force when virus rotates can be calculated. According to the balance condition of relaxation polarization, when the drive force equals to the resistant force, the rotating or swaying frequency of virus can be calculated. According to the heat producing condition such as friction, the temperature rising of virus can be calculated. When the temperature exceeds a certain threshold, virus would be inactivated. Through the calculation, it is found that the movement type of the virus depends on the intensity and frequency of the external electric field, which are the effects of "intensity widows" and '" frequency windows". It also gives approximate calculation of the temperature rising of the virus according to this model. The vitro experiment confirms the reasonability of this model. The electric fields of different densities of a certain frequency are applied to the solution of avian infectious bronchitis virus. Through the toxicity experiment of the SPF chicken embryo, it is found that the toxicity is decreased exceedingly with a certain intensity of the applied voltage. EID50 decreases from 6. 70/0. 2 mL to 2.66/0. 2 mL. It is proved that the avian infectious bronchitis virus can be inactivated with a certain low frequency and low-density electric field. 相似文献
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