On February 28, 2008, the State Council Information Office published a white paper entitled China＇s Efforts and Achievements in Promoting the Rule of Law. This document is the first white paper published by the gover...On February 28, 2008, the State Council Information Office published a white paper entitled China＇s Efforts and Achievements in Promoting the Rule of Law. This document is the first white paper published by the government on China＇s rule of law. It contains eight chapters and six appendices to review China＇s achievements on the road to practicing the rule of law in a compre- hensive way, and to expound the official Chinese policy and position on this is- sue. With some essential points inside, the publication of this white paper is of great significance, especially this year, to China＇s rule of law, human rights prog- ress, and its communication and dialogue with the international community.展开更多
从电导特性的角度研究了变压器油在高场强下的预击穿过程及机制,将变压器油在不同电场下的电导机制分为3个阶段:①在电场低于0.44 kV mm 1时,电导电流I与外施场强E成正的线性关系,符合欧姆定律;②电场强度在0.44 1.33 kV mm 1范围内时,l...从电导特性的角度研究了变压器油在高场强下的预击穿过程及机制,将变压器油在不同电场下的电导机制分为3个阶段:①在电场低于0.44 kV mm 1时,电导电流I与外施场强E成正的线性关系,符合欧姆定律;②电场强度在0.44 1.33 kV mm 1范围内时,ln(I/E2)1/E成正比,满足Fowler-Nordheim场致发射方程,属于隧道效应电流阶段;③当油中电场强度E>1.33 kV mm 1,I与电压的二次方U2成正比,属于空间电荷限制电流阶段,载流子视在迁移率c约为2.93 10 3cm2/(V s),当外施电场为2 kV mm 1时,载流子流速v为0.586 m s 1,电流体力学迁移率h约为1.5 10 3cm2(V s)1。同时,对影响变压器油电导特性的温度、流体压强、油中含水等因素进行研究,试验结果表明,随着温度的升高、流体压强的减小以及油中含水量的增加,变压器油的电导电流均将明显增加。此外,对工程上关注的不同浸油程度的绝缘纸板的电导和介电特性及其影响因素进行研究,结果表明,随着浸油水平、温度和工作频率的提高,绝缘纸板的电导电流均将相应增加。展开更多
文摘On February 28, 2008, the State Council Information Office published a white paper entitled China＇s Efforts and Achievements in Promoting the Rule of Law. This document is the first white paper published by the government on China＇s rule of law. It contains eight chapters and six appendices to review China＇s achievements on the road to practicing the rule of law in a compre- hensive way, and to expound the official Chinese policy and position on this is- sue. With some essential points inside, the publication of this white paper is of great significance, especially this year, to China＇s rule of law, human rights prog- ress, and its communication and dialogue with the international community.
文摘从电导特性的角度研究了变压器油在高场强下的预击穿过程及机制,将变压器油在不同电场下的电导机制分为3个阶段:①在电场低于0.44 kV mm 1时,电导电流I与外施场强E成正的线性关系,符合欧姆定律;②电场强度在0.44 1.33 kV mm 1范围内时,ln(I/E2)1/E成正比,满足Fowler-Nordheim场致发射方程,属于隧道效应电流阶段;③当油中电场强度E>1.33 kV mm 1,I与电压的二次方U2成正比,属于空间电荷限制电流阶段,载流子视在迁移率c约为2.93 10 3cm2/(V s),当外施电场为2 kV mm 1时,载流子流速v为0.586 m s 1,电流体力学迁移率h约为1.5 10 3cm2(V s)1。同时,对影响变压器油电导特性的温度、流体压强、油中含水等因素进行研究,试验结果表明,随着温度的升高、流体压强的减小以及油中含水量的增加,变压器油的电导电流均将明显增加。此外,对工程上关注的不同浸油程度的绝缘纸板的电导和介电特性及其影响因素进行研究,结果表明,随着浸油水平、温度和工作频率的提高,绝缘纸板的电导电流均将相应增加。
