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the operation performance Study of distance relay During Single phase Reclosure

The Operation Performance Study of Distance Relay During Sin...

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作者： Idris Khan 华北电力大学

学位级别：硕士

Electrical power is most important in day-to-day life. An electrical power system consists of generators, transformers, transmission and distribution lines etc. the electrical power is generated at generating stations or power stations. this generated power is stepped up and is transmitted through transmission lines. this transmitted power is stepped down at substations and is distributed to the consumers through feeders. During the transmission, faults can occur, which causes damage to the power system devices. the system also loses its stability when fault occurs. If a fault occurs in an element of a power system, an automatic protective device is needed to isolate the faulty element as quickly as possible to keep.the healthy section of the system in normal condition.A protective system includes circuit breakers and protective relays to isolate the faulty section of the system from the healthy sections. these protective elements should be able to analyze the type of fault that occurred during abnormal conditions. In this, we have analyzed different types of faults over a transmission line placed between two buses.the simulation studies is carried out using pSCAD/EMtDC software, and the results obtained is verified theoretically. distance relays are used to detect and protect from faults in transmission lines. A distance relay measures the impedance to the fault using the measured local voltage and current.Modelling of distance relays offer an economical and feasible alternative to investigate the performance of relays and protection systems. In this thesis MHO Characteristics and Frequency Dependent (phase) model type transmission line are modelled and simulated using pSCAD/EMtDC software. to study the performance of the relay characteristics, single line to ground fault with and without fault resistances are considered. A Fast Fourier transform block and sequence components blocks in pSCAD/EMtDC have been used to extract the fundamental components. th

关键词： distance relay modeling using pSCAD distance relay operation during single phase reclosing in two cases distance relay operation when p.t is on the bus side of the open phase distance relay operation when p.t is on the open side of transmission line

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