Impact of Shunt Circuit Breaker Technology on the Single Pole-to-Earth Fault Currents in Distribution Networks
AbstractIn the paper a systematic view of the shunt circuit breaker technology as a relatively new concept of distribution system earthing is given. This technology is primarily intended to improve distribution system power quality by creating the conditions for the elimination of transient single pole-to-earth faults without the interruption of power supply. The paper starts with the explanation of the shunt circuit breaker operation. Additionally, a brief description of the faulted phase detection principle and the coordination with earth fault protection is given. Then the paper moves in the development of a mathematical model based on the theory of symmetrical components intended for the calculation of the fault current on the faulted point and shunt circuit breaker point when the shunt circuit breaker is activated. The model is then applied on a test distribution network with different basic earthings for the purpose of the analysis how the network parameters, fault location, basic earthing and other parameters affect the shunt circuit breaker operation. Moreover, the calculated values of faulted currents are compared with the one calculated when the shunt circuit breaker is inactive.
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