Semiconducting layer as an attractive PD detection sensor of XLPE cables

Vakilian, Mehdi; Blackburn, T.R.; James, R.E.; Phung, B.T.

doi:10.1109/tdei.2006.1667750

Cited by 18 publications

(6 citation statements)

References 4 publications

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“…Although designers always deal with the stress problems in cable joints by various methods [13–25], the installation process leaves a variety of defects due to the uneven technical level of the installer. Based on the characteristics of 10 kV XLPE cable joints’ production process, here, six representative defect models are designed.…”

Section: Model Of Typical Defectsmentioning

confidence: 99%

Simulation and partial discharge detection for typical defects of 10 kV cable the joint

Xia

Song

et al. 2019

J. eng.

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Section: Model Of Typical Defectsmentioning

confidence: 99%

Simulation and partial discharge detection for typical defects of 10 kV cable the joint

Xia

Song

et al. 2019

J. eng.

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“…Using partial discharge measurements as a basis for assessing cable health has been the topic of several investigations [9,[21][22][23]. Other partial discharge detection sensors have been suggested such as an acoustic sensor [24].…”

Section: Measurement Techniques From Previous Researchmentioning

confidence: 99%

Dielectrometry Measurements of Moisture Diffusion and Temperature Dynamics in Oil Impregnated Paper Insulated Electric Power Cables

Thomas

Zahn

2008

Conference Record of the 2008 IEEE International Symposium on Electrical Insulation

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Paper insulated lead covered (PILC) cables have played an important role in underground power distribution for a hundred years. Replacing aged PILC before failure is critical to managing power distribution. Three prominent failure mechanisms accelerate cable aging: temperature stresses, moisture ingress, and partial discharge. The research focuses on the effect of temperature and moisture on the effective (complex) permittivity of the cable insulation. Measurements are performed using cylindrical dielectrometry sensors designed to be wrapped around the cable. The lead sheath of the cable is removed so that the sensors can be placed directly in contact with the insulation. From the measurements, the electrical properties of the material as a function of temperature and transient moisture diffusion are found.A theoretical treatment of the interdigital dielectrometry sensors with a cylindrical geometry is presented. Two classes of the geometry are studied. The φ periodic sensor geometry has electrodes aligned with the cylindrical axis and periodic around the circumference. The z periodic sensor geometry has the electrodes forming rings around the cylinder that are periodic along the cylindrical axis. The material is modeled by concentric rings of homogeneous materials. The electric field solution consists of an infinite summation of Fourier series terms. In finding the field solution and as a consequence of it, the potential, electric field lines, and the impedance between the driving and sensing electrodes are found. A generalized solution to the planar dielectrometry sensor topology is also presented. This solution allows for an arbitrary placement and excitation of electrodes, providing the analytical tools for a new generation of sensors.Dielectrometry sensors for use in φ and z periodic geometries are designed and manufactured on a 4 mil PTFE substrate. An experimental setup is designed and built to provide a temperature and humidity controlled environment for measurements. Special clamping mechanisms are used to secure the sensor to the sample. Custom built hardware is used to excite the sensor at frequencies ranging from 0.005 Hz to 10,000 Hz (over six decades), measure and record the response, and deliver it to a computer for storage and analysis.Steady state measurements are performed at temperatures ranging from room temperature to 100• C. Plastics, woods, and the PILC cable samples are measured. Using the theoretical model, the effective permittivity is estimated from the measurements. An Arrhenius temperature dependence is observed for several materials including the PILC cables. We characterize the temperature dependence of these materials by a master curve and activation energy. Together they give a complete description of the effective permittivity's frequency and temperature dependence.Transient measurements of moisture diffusion are made at constant temperatures for several 4 materials. For some experiments the boundary conditions limit the diffusion of moisture to one direction. When the z...

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“…1, where both conductor and insulation should be coated by semi-conductive shields to eliminate the electric field distortion and to form uniform electric field within the insulation. For this purpose, the shields should have high enough electrical conductivity and ultrahigh surface smoothness [15][16][17][18][19]. Taking the extruded 110 kV cables as an example, the electrical conductivity of the semi-conductive shields should be higher than 0.01 S/cm at room temperature [20].…”

Section: Introductionmentioning

confidence: 99%

Highly conductive polymer nanocomposites for emerging high voltage power cable shields: experiment, simulation and applications

Sun

et al. 2020

High Voltage

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High voltage power cables play a critical role in global electricity transmission and distribution. The currently used power cables cannot fulfil the green and sustainable requirement of modern society because of the thermoset nature of cable insulation and shields. This study is aimed at developing thermoplastic shields for high voltage power cable, which is one bottleneck restricting the development of environmental‐friendly cables. Using carbon black (CB) as the main conductive component and a small amount of carbon nanotubes (CNTs) or graphene as the second filler, highly conductive polypropylene based composite materials were prepared for potential shield applications. It was found that, at a fixed conductive filler loading, the replacement of a small amount CB by CNTs can significantly enhance the electrical conductivity and suppress its temperature dependence. However, when CB was replaced by graphene, only limited enhancement of electrical conductivity could be achieved and the electrical conductivity is still highly dependent on temperature. Dissipative particle dynamics simulations demonstrated that the enhanced conduction property in the CNTs‐containing composites could be understood by the shorter average distance between CB and CNTs. Finally, the coordination between the newly developed conductive composites and the environmental‐friendly thermoplastic polypropylene insulation was evaluated via high voltage direct current measurements, and the results revealed that the CNTs‐containing composites showed excellent suppression effect on the space charge injection and accumulation in the insulation. This research paved a new way for developing environmental‐friendly high voltage power cable shields.

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Semiconducting layer as an attractive PD detection sensor of XLPE cables

Cited by 18 publications

References 4 publications

Simulation and partial discharge detection for typical defects of 10 kV cable the joint

Simulation and partial discharge detection for typical defects of 10 kV cable the joint

Dielectrometry Measurements of Moisture Diffusion and Temperature Dynamics in Oil Impregnated Paper Insulated Electric Power Cables

Highly conductive polymer nanocomposites for emerging high voltage power cable shields: experiment, simulation and applications

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