Research on Relay Protection of DC Ultra High-Voltage Transmission Lines
Ultra high-voltage direct current(UHVDC)transmission lines are high-voltage transmission lines used for long-distance power transmission.Due to the fact that long-distance transmission usually requires crossing harsh environments,the likelihood of faults occurring on this line is significantly higher than that of other transmission lines.The probability of timely triggering and exerting protective actions is only about 50%.Therefore,in order to ensure the safe operation of UHVDC lines,appropriate relay protection measures need to be taken.This paper focuses on relay protection as the main research content,starting from the establishment of models and determination of ideas,and discusses the suitable relay protection schemes for UHVDC,in order to improve the reliability and safety of transmission lines and reduce the probability of accidents.
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