Realizing Quantitative Evaluation of Trap Energy Distribution in Polymers with an Electric Field Stimulated Depolarization Current Method

2021 ◽  
Vol 28 (2) ◽  
pp. 550-554
Author(s):  
Kai Zhou ◽  
Siyan Lin ◽  
Yuan Li ◽  
Mingzhi Li
Keyword(s):  
Electric Field ◽  
Energy Distribution ◽  
Quantitative Evaluation ◽  
Current Method ◽  
Depolarization Current ◽  
Trap Energy

scholarly journals Temperature and electric field dependence of charge conduction and accumulation in XLPE based on polarization and depolarization current

AIP Advances ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 015109 ◽  
Author(s):  
Guochang Li ◽  
Xuguang Zhou ◽  
Chuncheng Hao ◽  
Qingquan Lei ◽  
Yanhui Wei
Keyword(s):  
Electric Field ◽  
Field Dependence ◽  
Depolarization Current ◽  
Electric Field Dependence

QUANTITATIVE EVALUATION OF FORMATION PERMEABILITY FROM ACOUSTIC AND ELECTRIC STONELEY WAVES

2010 ◽  
Vol 02 (03) ◽  
pp. 585-615 ◽  
Author(s):  
BORIS D. PLYSHCHENKOV ◽  
ANATOLY A. NIKITIN
Keyword(s):  
Electric Field ◽  
Quantitative Evaluation ◽  
Pressure Field ◽  
Plane Waves ◽  
Stoneley Wave ◽  
Axial Component ◽  
Electrokinetic Phenomena ◽  
Stoneley Waves ◽  
Complex Valued ◽  
Analytical Expressions

Numerical experiments based on Pride's model of electrokinetic phenomena have shown that electromagnetic Stoneley waves as well as pressure Stoneley waves are most sensitive to permeability variations. A new way for quantitative evaluation of any value of formation permeability is presented. It is based on simultaneous measurement of pressure field and axial component of electric field excited by an acoustic source in fluid-filled borehole with help from a set of receivers in borehole. Frequency dependence of ratio of the complex-valued amplitudes of the electric Stoneley wave to the pressure Stoneley wave obtained as a result of plane waves decomposition of pressure field and mentioned component of electric field carries important information about permeability. The ratio of the real part of this ratio to its imaginary part is very sensitive to permeability variations. The approximate analytical expressions for this ratio derived for open and sealed pores on borehole wall are base for construction of a new way of quantitative evaluation of formation permeability.

scholarly journals Charge Injection Characteristics of Semi-Conductive Composites with Carbon Black-Polymer for HVDC Cable

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1134 ◽  
Author(s):  
Yanhui Wei ◽  
Mingyue Liu ◽  
Wang Han ◽  
Guochang Li ◽  
Chuncheng Hao ◽  
...  
Keyword(s):  
Carbon Black ◽  
Electric Field ◽  
Bottom Electrode ◽  
Charge Injection ◽  
Experimental Results ◽  
Uniform Electric Field ◽  
Insulation Material ◽  
Electrode Structure ◽  
Depolarization Current ◽  
Conductive Composites

Semi-conductive composites composed of carbon black-polymer play an important role in uniform electric field in high voltage direct current (HVDC) cable. They also affect space charge behaviors in the insulation material. However, the charge injection characteristics of semi-conductive composites are not detailed. In this work, the electrode structure of ‘Semi-conductive composites- Insulation material- Metal bottom’ (S-I-M) is proposed, and the currents formed by injected charges from semi-conductive composites are characterized by the thermally stimulated depolarization current (TSDC) method. Further, the experimental results based on the structure of S-I-M are compared with the traditional electrode structure of M-I-M (Metal upper electrode- Insulation material- Metal bottom electrode) and the simplified cable electrode structure of MS-I-M (Metal upper electrode-Semi-conductive electrode- Insulation material- Metal bottom electrode), respectively. The experimental results show that the semi-conductive composite plays an important role in the charge injection process and it presents a different tendency under different compound modes of temperature and electric field. For the low electric field (E ≤ 5 kV/mm) and the low temperature (T ≤ 50 °C), the current caused by the accumulated charges follows the rule, IS > IMS > IM. For the low electric field and high temperature (T > 50 °C), the current caused by the injected charges follows the rule, IMS > IM > IS. This phenomenon is closely related to the interface characterization and contact barrier.

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