Optimization of location and number of lightning arresters in 420 kV substations in Turkish high voltage electricity system

Download
index.pdf
2014
Tulaz, Mert Ozan
Show full item record
255
views
117
downloads
Insulation coordination is defined as the selection of the dielectric strength of equipment in relation to the voltages which can appear on the system for which the equipment is intended and taking into account the service environment and the characteristics of the available protective devices. In an insulation coordination study, the voltage levels of power system equipment are determined in order to ensure the protection of equipment against overvoltages. This proper design in terms of the insulation coordination provides the reliability of the system by decreasing insulation failures and reduces the cost of the system by preventing oversizing of the equipment. Hence, insulation coordination is an important study for power systems in order to prevent failures and overinvestment. In this thesis, an insulation coordination study is performed for lightning overvoltages in 420 kV substations in Turkish High Voltage Electricity System. The lightning impulse withstand voltage levels of the equipment are analyzed and evaluated as compared to current values in the system. In order to obtain optimum lightning arrester locations and numbers in the substation, different cases are defined and analyzed through computer simulations on Alternative Transient Program (ATP). In this context, this thesis study proposes additional lightning arrester application at the line entrance to existing lightning arresters located at the front of power transformer in 420 kV substations of Turkish High Voltage Electricity System. With this additional application, it is concluded that lightning impulse withstand voltage levels of equipment can be reduced to voltages that are the standard values recommended in IEC for 420 kV systems, 1300 kV for power transformer and 1425 kV for other equipment.
Lightning-arresters., High voltages., Dielectrics., Electric power systems., Electric power transmission., Electric insulators and insulation.
http://etd.lib.metu.edu.tr/upload/12616937/index.pdf
https://hdl.handle.net/11511/23352
Graduate School of Natural and Applied Sciences, Thesis

Suggestions

Improvement of the electric field distribution in the medium voltage gas insulated inductive voltage transformers
Var, Melih; Keysan, Ozan; Department of Electrical and Electronics Engineering (2017)
IVoltage transformers are commonly used in medium voltage systems for both protection and measurement purposes. These transformers are designed to satisfy the mandatory IEC requirements at the lowest possible cost. The average life expectancy of such transformer is about 20 years, reliability and robustness are of the utmost importance. The main cause of failure during rated operation is the deterioration of the solid insulation by partial discharges. Partial discharges, unless there is a manufacturing erro...
Determination of optimum values for voltage setpoints of power stations in Turkey
Elma, İsmail; Güven, Ali Nezih; Tör, Osman Bülent; Department of Electrical and Electronics Engineering (2014)
Voltage control is performed in three hierarchical levels in Turkish power system: primary, secondary and tertiary voltage control. Primary and secondary voltage controls are defined as the regulation of the voltage at the generator terminal and at the high voltage busbar of the power plant according to the pre-determined setpoints. The determination of the voltage setpoints for the power plants, which is defined as the tertiary voltage control, is performed by the operators in National and Regional Load Di...
Output voltage control of a four-leg inverter based three-phase ups by means of stationary frame resonant filter banks
Demirkutlu, Eyyüp; Hava, Ahmet Masum; Department of Electrical and Electronics Engineering (2006)
A method for high performance output voltage control of a four-leg inverter based three-phase transformerless UPS is proposed. Voltage control loop is employed and the method employs stationary frame resonant filter controllers for the fundamental and harmonic frequency components. A capacitor current feedback loop provides active damping and enhances the output voltage dynamic performance. The controller design and implementation details are given. Linear and nonlinear loads for balanced and unbalanced loa...
Performance of a dynamic voltage restorer for a practical situation
Oğuz, Gülçin; Ermiş, Muammer; Department of Electrical and Electronics Engineering (2004)
Among most severe power system disturbances those degrading power quality are voltage sags and transient interruptions. Even voltage sags lasting only a few tens of milliseconds are enough to bring entire production lines to standstill, causing considerable economic damage as well as endangering the production equipment. Therefore necessary measures have to be taken to protect sensitive loads which are susceptible to these voltage disturbances. Among the solution candidates such as, Uninterruptible Power Su...
Repetitive control of a three-phase uninterruptible power supply with isolation transformer
Çetinkaya, Süleyman; Hava, Ahmet Masum; Department of Electrical and Electronics Engineering (2006)
A repetitive control method for output voltage control of a three phase uninterruptible power supply (UPS) with isolation transformer is investigated. In the method voltage control loop is employed in the stationary dq frame. The controller eliminates the periodic errors on the output voltages due to inverter voltage nonlinearity and load disturbances. The controller design and implementation details are given. The controller is implemented on a 5-kVA UPS prototype which is constructed in laboratory. Linear...
Citation Formats
M. O. Tulaz, “Optimization of location and number of lightning arresters in 420 kV substations in Turkish high voltage electricity system,” M.S. - Master of Science, Middle East Technical University, 2014.
METU IIS - Integrated Information Service open@metu.edu.tr