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In this study, an application of a line surge arrester was presented for a 380 kV Turkish Power Transmission Line by using PSCAD simulation software. Simulations were limited to the over-voltages caused by the lightning surges. Real system data was used for a representative transmission line, which was subjected to relatively higher number of outages in the past. The simulations were performed to...
This paper presents the numerical analysis of the voltage-current relationship of a metal-oxide surge arrester by using Finite Element Method. In the analysis as an application example, a surge arrester with 123 kV rated voltage was taken into account. The surge arrester was studied by using a 2D axi-symmetrical model. The nonlinear V-I characteristics of the metal-oxide resistors was approximated...
In recent years, environmental awareness has been a great concern, and even governments have sometimes been under pressure to comply with bilateral agreements. Mineral oil is one of the most harmful pollutants if it infiltrates the soil. Of course, it provides a good insulation material in (distribution/power) transformers, but it presents some disadvantages such as low firing value, additional insulation...
High voltage laboratories are equipped with impulse generators to perform some performance tests. They require high-accuracy data acquisition systems to ensure the safety, accuracy and the reliability of the measurement, Digital recording systems and interrelated software contribute to the analysis of the wave shape during the tests. On the other hand, the noise superimposed on the signal may sometimes...
Bushings are one of the most essential parts of the electrical distribution and transmission systems since they enable high currents to pass through from one medium to another and isolate the high voltages from the grounded parts. In addition to electrical and mechanical stresses, they are also subjected to thermal stresses. This study presents temperature distribution of 36 kV DAF-30 wall type bushings...
This paper presents optimum capacitive transformer bushing design for a 154 kV power transformer by boundary element-based simulations. Capacitive bushings include several conductive foils to improve the field distribution both within the insulator and along the insulator surface. Conductive foil configuration; i.e. number of the foils, location of the foils, length of the foils, and thickness of...
This paper presents simulations of pollution and their effects on the electrical performance of cap-and-pin glass suspension insulators. The pollution is modeled by using a partially conductive epoxy resin with graphite powder. The effects of the pollution levels as well as their locations on the insulator surfaces are investigated for both simulation and experimental studies. The studies are conducted...
This paper presents the results of a study of the ac and the transient electric field distributions along a 380 kV V-string of glass cap-and-pin suspension insulators. The transmission tower, conductors and insulators are modeled in 3D, and COMSOL 4.2 is used for the finite element simulations. The insulators are modeled both for clean and for the polluted cases. The pollution layer is modeled by...
This study presents the influence of corona rings on impulse withstand performance of 380 kV V-insulator strings. Those strings comprising cap-and-pin type glass insulator units are one of the most common configurations in Turkish National Power Transmission System. Laboratory test setup was constructed for the centre phase of a full scaled tower. Laboratory tests are performed to investigate the...
This paper presents corona ring optimization of V-insulator string with respect to field simulations, RIV levels and AC flashover voltages. Corona ring diameter, tube diameter and installation height are considered as optimization parameters. Variations of electrical fields on the critical parts of the string are obtained by 3D simulation studies for different ring settings and optimum parameters...
This paper presents simulations of electric field distributions around 154 kV composite insulators used in Turkish National Power Transmission Systems. Simulation studies are performed for different corona ring settings under AC excitation and impulse excitation. Electric field strength and potential values on the critical parts of the insulator unit are compared for different corona ring diameter,...
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