Thesis
AJUSTE Y COORDINACION DE PROTECCIONES PARA LINEAS DE TRANSMISION QUE COMPARTEN EL MISMO DERECHO DE VIA
Autor
NAJERA GUEVARA, ADRIEL
Institución
Resumen
The transmission lines cover a substantial area in electricity networks reason why they are exposed to a variety of risks that can cause failure. Therefore it is not surprising that the transmission line has the highest rate of failures in an electrical system, than any other of its components.
The transmission systems are formed by different types of configurations, one of them is the presence of parallel lines in the network whose role is to strengthen links with the purpose to increase the transmission capacity of electricity that can be transmitted from one place to another and at the same time this type of configuration provides increased reliability to the electrical system. Also due to the growth of electricity demand, power systems are becoming more robust and complex, an example of this is mentioned as the interconnection of various transmission lines. The operation of these networks requires constant re-configuration of power systems and consequently the need for adjustments in the protective devices to avoid incorrect operation of these devices, in the presence of fault conditions.
On the lines of double circuit transmission and which are magnetically coupled is common that distance relays present problems of over-range or sub-reach in a short circuit condition. Moreover, directional overcurrent relays also due to the mutual coupling of the lines has caused a number of shots wrong. Due to problems in the operation of distance relays and overcurrent analysis is necessary to allow proper operation of the protection installed on the transmission lines that are magnetically coupled.
In this paper we developed a study on transmission lines with mutual coupling, in its different versions as: with common buses at both ends of the line, with only one bus in common and without ordinary buses. We propose a methodology for calculating the impedance adjustment of the distance relays also proposes a methodology to calculate the current pickup setting of directional overcurrent relays to achieve satisfactory operation of transmission systems that present lines parallel and present the effect of mutual coupling. The study was performed using digital simulation software ASPEN V10.12 to simulate faults and apply the methodology proposed in the networks taken as case studies. The results of these studies show the satisfactory performance of protective relays in transmission lines with mutual coupling.