"Study of Nonlinear Conduction Mechanism for Polymeric Insulating Material due to Space Charge Formation Under AC High Field."

“交流高场下空间电荷形成引起的聚合物绝缘材料非线性传导机制的研究”。

• 批准号: 17360147
• 负责人: TOHYAMA Kazuyuki
• 金额: $ 10.26万
• 依托单位: Numazu National College of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360147/
• 关键词: Dissipation Current Waveform; Electroluminescence; Low Density Polyethylene; AC High Field; Conduction; Nanocomposite; Dielectric Property; Space Charge; 電気伝導; 発光スペクトル; 時間依存性; 電極金属依存性; 瞬時電界上昇率

Polymers are extensively used as insulating material in underground power cables. It has been well established that electroluminescence (EL) and charge injection, which gives rise to space charge in the polymeric insulation, occur at ac field above a certain threshold value. Space charge can cause dissipative energetic processes such as photon and phonon emission, increase the local electric field, lead to the reduction of the insulation withstand voltage and ultimately to premature failure of the power cable. It is considered that EL is emitted even before the first partial discharge, EL occur continuously above a certain threshold field and has been attributed to the injection of electric charge form the electrodes. The injected charge accumulates in the insulating material to form a space charge, which plays a major role in do voltage applications, but cannot be completely ignored in ac applications. The role of space charge in polymeric materials subjected to AC high field is still … More not well understood.In order to clarify the conduction mechanism of polymers, such as Low Density Polyethylene (LDPE), LDPE/MgO nanocomposite materials, and so on, under ac high field, the simultaneous observation system of dissipation current waveform and electroluminescence have been constructed for three years since 2005. As the developed dissipation current waveform detecting circuit, which called as"Displacement Current Bypassing Method(DCBM)", does not include any inductance for canceling the capacitance component, it is possible to detect the harmonics with high accuracy. Furthermore it is not only detecting the harmonics of the dissipation current in high field, but also estimating the volume resistivity and relative permittivity under AC high field. The observation of EL under AC high field is also very useful to understand the charge behavior. The developed EL observation system is just for a polymeric film sample. In 2002, the sample holder for a film sample was developed at the collaboration with NRC. To realize the simultaneous observation of the dissipation current waveform observed by DCBM and EL observed by PMT and CCD, the several software, which make possible perfectly controlling the digital oscilloscopes for the dissipation current waveform and EL observation, the triggering control for high sensitivity CCD camera, and the arbitrary function generator, has also developed by using Lab VIEW. In order to clarify the conduction mechanism for polymer under AC high field, the various kinds of experiments were carried out, such as estimations of dE/dt by using trapezoidal waveform application, effect of MgO nano filler on LDPE/MgO nanocomposite materials, the time variations of fundamental and third harmonics of dissipation current and EL, and so on, by using the developed system. Less

聚合物被广泛用作地下电力电缆的绝缘材料。电致发光(EL)和电荷注入是聚合物绝缘材料在高于一定阈值的交变电场中产生空间电荷的主要原因。空间电荷会引起光子、声子发射等耗散能过程，增加局部电场，导致绝缘耐受电压降低，最终导致电力电缆过早失效。认为EL甚至在第一次局部放电之前就已经发射，EL在一定的阈值电场以上连续出现，并被归因于电极的电荷注入。注入的电荷聚集在绝缘材料中形成空间电荷，在DO电压应用中起主要作用，但在交流应用中不能完全忽略。在交变高场作用下，聚合物材料中空间电荷的作用仍然是…为了弄清低密度聚乙烯(LDPE)、低密度聚乙烯/氧化镁纳米复合材料等聚合物在交流高场下的导电机理，从2005年开始，我们建立了为期三年的耗散电流波形和电致发光同步观测系统。由于所研制的耗散电流波形检测电路称为位移电流旁路法(DCBM)，不包含任何用于抵消电容分量的电感，因此可以实现高精度的谐波检测。此外，它不仅可以检测高场下损耗电流的谐波，还可以估计交流高场下的体电阻率和相对介电常数。交流高场下电致发光的观察对于理解电荷行为也是非常有用的。所研制的电致发光观测系统仅适用于聚合物薄膜样品。2002年，在与NRC的合作下，开发了用于电影样品的样品保持器。为了实现光电倍增管和光电倍增管同时观测DCBM和EL的耗散电流波形，利用Lab view开发了几个软件，实现了对数字示波器的耗散电流波形和EL观测的完美控制，以及对高灵敏度CCD相机的触发控制和任意函数发生器的控制。为了阐明聚合物在交流高场下的导电机理，利用研制的实验系统进行了各种实验，如梯形波法估算de/dt，纳米氧化镁填料对LDPE/氧化镁纳米复合材料的影响，损耗电流和电致发光的基波和三次谐波随时间的变化等。较少

项目成果

Consideration of Conduction Mechanism of LDPE under AC High Field

交流强电场下LDPE导电机理的思考

• 发表时间: 2006
• 作者: Kazuyuki Tohyama;et al.
• 通讯作者: et al.

Consideration of Conduction Mechanisms under AC High Field for Low Density Polyethylene

低密度聚乙烯交流强电场下导电机理的思考

• 发表时间: 2005
• 作者: Ayano Fujita;et al.
• 通讯作者: et al.

Transient response of various kinds of high field alternating signals for low density polyethylene

低密度聚乙烯各种高场交变信号的瞬态响应

• 发表时间: 2005
• 期刊: 2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena 05CH37702
• 作者: M.;Yoshimoto;G.;Feng;K.;Oe;坪井 臣悟;藤田 彩乃;G. Feng,.,;Shingo Tsuboi
• 通讯作者: Shingo Tsuboi

真空蒸着法

真空沉积法

• 发表时间: 2008

Considerations for conduction mechanisms under AC high field for low density polyethylene

低密度聚乙烯交流强场下传导机制的考虑

• 发表时间: 2005
• 期刊: 2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena 05CH37702
• 作者: M.;Yoshimoto;G.;Feng;K.;Oe;坪井 臣悟;藤田 彩乃;G. Feng,.,;Shingo Tsuboi;G. Feng,.,;Ayano Fujita
• 通讯作者: Ayano Fujita