Development of algorithms for fault detection in distribution systems

Ersoi, Moustafa
In this thesis, the possibility of detection of fault location in the cable distribution systems by using traveling waves due to fault and circuit breaker operations is investigated. Waveforms originated from both actions and fault steady state are separately analyzed. During such switching actions, high frequency variations which are absent in the steady state conditions, take place. In order to simulate high frequency changes properly, system elements are modeled accordingly. In other words, frequency dependent models are introduced, and they are used in Electro-Magnetic Transients Program (EMTP). Since the characteristics of waveforms are different for separately analyzed portions, different fault locating algorithms with their limitations are introduced.


Thermal analysis of power cables
Güven, Oytun; Ertaş, Arif; Department of Electrical and Electronics Engineering (2007)
This thesis investigates temperature distribution and hence heat dissipation of buried power cables. Heat dissipation analysis of a simple practical application and the parameters that affect the heat dissipation are discussed. In analyzing temperature distribution in the surrounding medium , a computer program is developed which is based on gauss-seidel iteration technique. This method is applied to a sample test system and heat dissipation curves for several parameters are obtained. Also, current carrying...
GIS based modelling and analysis of unbalanced LV distribution networks with distributed energy resources
Özdamar, İsmail; Güven, Ali Nezih; Department of Electrical and Electronics Engineering (2019)
Conventional low voltage (LV) distribution networks are radially designed and operated in pre-defined loading limits and voltage range. However, with the increasing electricity demand and distributed generations (DGs) resulting reverse flows and under voltages, LV networks will have serious problems such as overloading and voltages out of limits. With the integration of distributed energy resources (DERs) in the system such as distributed generations, rooftop photovoltaics, battery storages, and electric ve...
Optimal allocation of sectionalizing switches in rural distribution systems
Daldal, Mustafa; Özay, Nevzat; Department of Electrical and Electronics Engineering (2011)
The distribution system which forms the final connection between customers and power source plays a vital role in an electrical network. Different studies show that substantial proportion of the customer interruptions occurs due to the failures on distribution network. The ongoing privatization process of the electrical distribution services in Turkey raises the importance of reliable and continuous electricity supply significantly. The new regulations come up with this privatization process and the electri...
Güven, Ali Nezih (1986-10-01)
It is important to determine the segment-by-segment distribution of the fault current in a multigrounded power network for better power system operation and grounding structure design. In this paper, a new method for the analysis of ground fault current distribution along underground cables (and/or overhead lines) is presented. The method is sufficiently accurate and comprehensive to simultaneously consider all the significant variables. The equivalent circuit developed utilizes both lumped and distributed ...
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. Ersoi, “Development of algorithms for fault detection in distribution systems,” M.S. - Master of Science, Middle East Technical University, 2003.