Abstract
This paper presents a transient based protection for High Voltage Direct Current (HVDC) system. HVDC system responses during internal and external fault are studied. Transient energy difference and the relation between various parameters of the line are analyzed during each fault. Based on that the transient principle is developed. Transient energy is obtained from the voltage and current values at the two ends of the line. Internal fault and external fault can be identified easily from the calculated value of transient energy. The location of fault during pole to ground was found out using transient data. The test system is modeled and analyzed for various faults using MATLAB - SIMULINK package based on CIGRE HVDC benchmark system.
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