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http://www.fp.utm.my/epusatsumber/pdffail/ptkghdfwP2/Lee%20Mei%20Yun.TP.pdf

Declaration of thesis / undergraduate project paper and copyright

In order to reduce the failure accidents of conventional packers, a kind of sealing structure of retrievable packers is designed, which can provide reference for optimizing the sealing performance and pressure capacity of packers. And theoretical calculation and experimental research on their sealing performance and pressure capacity are carried out through the finite element analysis on the contact with large deformation based on Abaqus and experimental study. The results show that the upper packer is subjected to greater stress and mainly plays a sealing role in the sealing process. In order to improve the sealing performance of the packer, the height of the upper and lower packer should be preferentially selected about 60 mm, the height of the middle rubber cylinders should be about 50 mm, and the thickness of the packer should be about 21 mm. The newly designed rubber cylinders can meet 150°C. The newly designed rubber cylinders can meet the sealing function and pressure bearing function under the condition of 10,000 Psi and 150°C. The newly designed rubber cylinder can satisfy the function of sealing and pressure-bearing under 140°C and 10,000 Psi. The whole experiment shows that the capacity of bearing pressure and sealing is stable, which can better meet the requirements of field use.

/pdf/design-and-experimental-research-on-sealing-structure-for-a-6dfq31texx.pdf

Design and Experimental Research on Sealing Structure for a Retrievable Packer

This paper reports experimental and analytical results of partial discharge degradation of silicone rubber sheets in accordance with proposed procedures. Considering the actual usage condition of silicone rubber as an insulating material of polymer insulators, an experimental procedure is established to evaluate long-term surface erosion caused only by partial discharge. Silicone rubber is subjected to partial discharge for 8 h using an electrode system with air gap. Voltage application is stopped for subsequent 16 h for recovery of hydrophobicity. The 24 h cycle is repeated 50 or 100 times. Deterioration of sample surface is evaluated in terms of contact angle and surface roughness. It is confirmed the proposed experimental procedure has advantage of no arc discharge occurrence, good repeatability of results, and possible acceleration of erosion. Surface erosion of silicone rubber progresses gradually and finally breakdown of silicone rubber occurs. Alumina trihydrate (ATH), an additive to avoid tracking and erosion by discharge, is not necessarily effective to prevent breakdown caused by partial discharge when localized electric field in air is enhanced by adding ATH. In such a situation, lower permittivity and higher resistance of silicone rubber seem dominant factors to prevent partial discharge breakdown and a careful insulation design should be required.

Assessment of Surface Degradation of Silicone Rubber Caused by Partial Discharge

Partial discharge performance improvement of covered conductor (CC)/high voltage insulator based electrical distribution systems

Advanced Visualization System of Magnetic Field Distribution using Wireless Magnetic Sensor Module and Skeleton Tracking Kinect

Partial discharge activities such as charge, number of pulses, and soon of non-treated and artificially deteriorated silicone rubber samples were investigated in the clean/salt fog. It was proved that charge and number of pulses depended on the condition of silicone rubber surface and fog conductivity.

Partial discharge characteristics of wet and contaminated silicone rubber surface

IEC 62110に準拠した配電用機器から発生する磁界の評価;IEC 62110に準拠した配電用機器から発生する磁界の評価;Evaluation of Magnetic Field Generated by Power Distribution Equipment in Accordance with IEC 62110

Partial discharge is one of the important factors to affect the long-term reliability of polymer insulators. This paper reports the surface degradation of five kinds of silicone rubber sheets caused by partial discharge. Samples were subjected to partial discharge for 8 hours and then voltage application was interrupted for 16 hours for recovery of hydrophobicity. The 24hour cycle was repeated 72 or 100 times. As indexes to characterize the partial discharge deterioration, the contact angle and surface erosion of samples were evaluated. It was confirmed that the sample without alumina trihydrate had the highest resistance to partial discharge degradation.

Interaction of Partial Discharge in Air with Silicone Rubber

This paper reports results of magnetic flux density (denoted as magnetic field hereafter) measurements under power transmission lines and around power distribution equipment. Measurements were carried out in accordance with IEC 62110 established in 2009, which prescribes measurement and evaluation procedures of uniform and non-uniform magnetic field generated by ac power systems with regard to human exposure. The average and the maximum exposure levels of magnetic field generated such power facilities were evaluated and found much lower than the reference level from the ICNIRP Guidelines.

https://ieeexplore.ieee.org/iel7/6982270/6997075/06997242.pdf

Mitsuki Shimada

Papers

Assessment of Surface Degradation of Silicone Rubber Caused by Partial Discharge

Partial discharge characteristics of wet and contaminated silicone rubber surface

IEC 62110に準拠した配電用機器から発生する磁界の評価;IEC 62110に準拠した配電用機器から発生する磁界の評価;Evaluation of Magnetic Field Generated by Power Distribution Equipment in Accordance with IEC 62110

Interaction of Partial Discharge in Air with Silicone Rubber

Evaluation of magnetic field generated by power facilities in accordance with IEC 62110