02121nam a22001457a 4500 59124 59121 Abdul Khalique Junejo 13MPE02 Supervisor Prof. Dr. Muhammad Usman Keerio 13MPE-02 Analysis about Propagation of Voltage Sag in Low Voltage Distribution Network by Using Simulink /MATLAB Nawabshah: QUEST, 2015. 64p. ABSTRACT The power system has four stages generation, transmission, distribution and utilization. Whenever fault occurs at any stage of power system voltage profile will change in magnitude with change in phase angle. In distribution system very sensitive loadsare connected with system due to fault conditions, unbalancing in voltage occur so equipment may be burnt or damage. Fault in distribution system may leads to voltage sag in system, it is big issue of power quality, to analysis of voltage sag on different fault type and transformer winding connections is very. essential to ensure the power quality. This research how the analysis of voltage sags when different fault occur in distribution y tern, there are two types of faults symmetrical and unsymmetrical so voltage ag has al o two types symmetrical and unsymmetrical. In distribution system transformer is one of the important machine to raise or down the voltage, in distribution transformer has different winding connections so voltage sag due to faults can propagate from primary of transformer to secondary of transformer depends upon the fault type and winding connections of transformer. In this thesis after analysis of voltage sags it has found that when zero sequence components are not involved then same voltage sag will propagation takes place at primary of transformer to secondary of transformer. In this thesis it is also analysis that voltage sage propagation depends on fault types and winding connection of transformer .This research results are helpful for design of adaptive protection and voltage controller for power system. Department of Electrical Engineering https://tinyurl.com/yc72h89m THESIS 0 0 0 0 RESEARCH RESEARCH 2018-09-26 0 MP/25-272 2018-09-26 00:00:00 THESIS