1st International Materials, Industrial, and Manufacturing Engineering Conference, MIMEC 2013, 2014
Cross-linked polyethylene is widely used as electrical insulation because of its excellent electr... more Cross-linked polyethylene is widely used as electrical insulation because of its excellent electrical properties such as low dielectric constant, low dielectric loss and also due to its excellent chemical resistance and mechanical flexibility. Nevertheless, the most important reason for failure of high voltage equipment is due to its insulation failure. The electrical properties of an insulator are affected by the presence of cavities within the insulating material, in particular with regard to the electric field and potential distributions. In this paper, the electric field and potential distributions in high voltage cables containing single and multiple cavities are studied. Three different insulating media, namely PE, XLPE, and PVC was modeled. COMSOL software which utilises the finite element method (FEM) was used to carry out the simulation. An 11kV underground cable was modeled in 3D for better observation and analyses of the generated voltage and field distributions. The results show that the electric field is affected by the presence of cavities in the insulation. Furthermore, the field strength and uniformity are also affected by whether cavities are radially or axially aligned, as well as the type of the insulating solid. The effect of insulator type due the presence of cavities was seen most prevalent in PVC followed by PE and then XLPE.
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Papers by Saeed Vahabi
used in electrical substations and other power plants. A thermal image can be obtained to help in
identifying abnormal heating regions in power equipment. Under high voltage circumstances, it is a
hazard for personals to capture the image at a close distance from the power equipment. This paper
described the development of a remote control monitoring system for a thermal camera. XBEE is a
new and popular protocol for wireless communication because of its low power assumption, large
network capability and the ability to organize a network automatically. 10 samples data are collected
within the 30m and the successful transfer rate reached 98.89%. Remote control of thermal camera
helps human keep distance from the high electric field and at the same time convenient for a user to
conduct online condition monitoring in order to prevent any accident in power station.
system resulting from various sources. The surge arrester affects from degradation due to the
continuous operating voltage system as well as due to repeated lightning current discharge.
Therefore, condition monitoring and health diagnostics of surge arresters are a necessary issue.
Hence, as a feasible solution, a condition monitoring based on leakage current measurement
techniques was selected to tackle the problem of age diagnostics of surge arresters. The Particle
Swarm Search Algorithm was introduced as a method for extracting the third harmonic resistive
component, Ir3rd, from the total leakage current. To employ this method for extracting Ir3rd, codes
were developed in Matlab. The setting of Particle Swarm Search Algorithm was configured for
extracting Ir3rd and accuracy of 94% was obtained.
probable interruption which can be caused by the failure of surge arresters. This paper aims to carry
out experimental and simulation work to find the relationship between the aging level, arrester
surface temperature and ambient temperature. COMSOL simulation software was used for the
modeling of 120kV rated gapless ZnO surge arresters. It is observed from both the simulation
analysis and experimental data that the leakage current and temperature increase as a consequence
of an increase in the applied voltage across the arrester. The thermal profile of the ZnO surge
arrester changes depending on the aging level and the ambient temperature. The surface temperature
simulation results compare well with the experimental results, for the case of varying aging levels.
high voltage stress is Partial discharge (PD). Partial discharge measurement is commonly used to
evaluate the performance of the insulation in high voltage system. Modeling of the discharge in
insulation can give a better understanding of this important phenomenon. A cavity within a
dielectric material is a highly stressed area and the ideal place for starting partial discharge and
breakdown. The applied voltage is one of the important factors that PD activity is influenced by
that. Previous studies have considered the behavior of PD activity in a spherical cavity at 50Hz of
sinusoidal applied voltage. However, still not so much work on the simulation of the PD activity in
the cavity under different condition. Also, there is little data are available on the effect of
parameters on the PD activity. This paper describes the behavior of PD activity as a function of
applied voltage in a cylindrical cavity within a homogeneous dielectric. COMSOL and MATLAB
software were used to carry out the simulation based on the finite element method (FEM). The
number of PDs per cycle changed with different applied voltage so the highest number of PD at
20kV and the lowest value at 8kV. The maximum PD magnitude is raised from 1200pC at 8kV to
2400pC at 20kV applied voltage. The number of PD is most prevalent for sinusoidal followed by
triangular waveform and then sawtooth. Comparison of the simulation results and experimental
results are in good agreement. The result can help the researcher to understand more about the
characteristics and behavior of partial discharge. Which may help the insulation diagnostic testing
or condition monitoring.
electrical properties such as low dielectric constant, low dielectric loss and also due to its excellent
chemical resistance and mechanical flexibility. Nevertheless, the most important reason for failure
of high voltage equipment is due to its insulation failure. The electrical properties of an insulator are
affected by the presence of cavities within the insulating material, in particular with regard to
theelectric field and potential distributions. In this paper, the electric field and potential distributions
in high voltage cables containing single and multiple cavities are studied. Three different insulating
media, namely PE, XLPE, and PVC was modeled. COMSOL software which utilises the finite
element method (FEM) was used to carry out the simulation. An 11kV underground cable was
modeled in3D for better observation and analyses of the generated voltage and field distributions.
The results show that the electric field is affected by the presence of cavities in the insulation.
Furthermore, the field strength and uniformity are also affected by whether cavities are radially or
axially aligned, as well as the type of the insulating solid. The effect of insulator type due the
presence of cavities was seen most prevalent in PVC followed by PE and then XLPE.
used in electrical substations and other power plants. A thermal image can be obtained to help in
identifying abnormal heating regions in power equipment. Under high voltage circumstances, it is a
hazard for personals to capture the image at a close distance from the power equipment. This paper
described the development of a remote control monitoring system for a thermal camera. XBEE is a
new and popular protocol for wireless communication because of its low power assumption, large
network capability and the ability to organize a network automatically. 10 samples data are collected
within the 30m and the successful transfer rate reached 98.89%. Remote control of thermal camera
helps human keep distance from the high electric field and at the same time convenient for a user to
conduct online condition monitoring in order to prevent any accident in power station.
system resulting from various sources. The surge arrester affects from degradation due to the
continuous operating voltage system as well as due to repeated lightning current discharge.
Therefore, condition monitoring and health diagnostics of surge arresters are a necessary issue.
Hence, as a feasible solution, a condition monitoring based on leakage current measurement
techniques was selected to tackle the problem of age diagnostics of surge arresters. The Particle
Swarm Search Algorithm was introduced as a method for extracting the third harmonic resistive
component, Ir3rd, from the total leakage current. To employ this method for extracting Ir3rd, codes
were developed in Matlab. The setting of Particle Swarm Search Algorithm was configured for
extracting Ir3rd and accuracy of 94% was obtained.
probable interruption which can be caused by the failure of surge arresters. This paper aims to carry
out experimental and simulation work to find the relationship between the aging level, arrester
surface temperature and ambient temperature. COMSOL simulation software was used for the
modeling of 120kV rated gapless ZnO surge arresters. It is observed from both the simulation
analysis and experimental data that the leakage current and temperature increase as a consequence
of an increase in the applied voltage across the arrester. The thermal profile of the ZnO surge
arrester changes depending on the aging level and the ambient temperature. The surface temperature
simulation results compare well with the experimental results, for the case of varying aging levels.
high voltage stress is Partial discharge (PD). Partial discharge measurement is commonly used to
evaluate the performance of the insulation in high voltage system. Modeling of the discharge in
insulation can give a better understanding of this important phenomenon. A cavity within a
dielectric material is a highly stressed area and the ideal place for starting partial discharge and
breakdown. The applied voltage is one of the important factors that PD activity is influenced by
that. Previous studies have considered the behavior of PD activity in a spherical cavity at 50Hz of
sinusoidal applied voltage. However, still not so much work on the simulation of the PD activity in
the cavity under different condition. Also, there is little data are available on the effect of
parameters on the PD activity. This paper describes the behavior of PD activity as a function of
applied voltage in a cylindrical cavity within a homogeneous dielectric. COMSOL and MATLAB
software were used to carry out the simulation based on the finite element method (FEM). The
number of PDs per cycle changed with different applied voltage so the highest number of PD at
20kV and the lowest value at 8kV. The maximum PD magnitude is raised from 1200pC at 8kV to
2400pC at 20kV applied voltage. The number of PD is most prevalent for sinusoidal followed by
triangular waveform and then sawtooth. Comparison of the simulation results and experimental
results are in good agreement. The result can help the researcher to understand more about the
characteristics and behavior of partial discharge. Which may help the insulation diagnostic testing
or condition monitoring.
electrical properties such as low dielectric constant, low dielectric loss and also due to its excellent
chemical resistance and mechanical flexibility. Nevertheless, the most important reason for failure
of high voltage equipment is due to its insulation failure. The electrical properties of an insulator are
affected by the presence of cavities within the insulating material, in particular with regard to
theelectric field and potential distributions. In this paper, the electric field and potential distributions
in high voltage cables containing single and multiple cavities are studied. Three different insulating
media, namely PE, XLPE, and PVC was modeled. COMSOL software which utilises the finite
element method (FEM) was used to carry out the simulation. An 11kV underground cable was
modeled in3D for better observation and analyses of the generated voltage and field distributions.
The results show that the electric field is affected by the presence of cavities in the insulation.
Furthermore, the field strength and uniformity are also affected by whether cavities are radially or
axially aligned, as well as the type of the insulating solid. The effect of insulator type due the
presence of cavities was seen most prevalent in PVC followed by PE and then XLPE.