Abstract—With the replay of the dc voltage fault record, this paper analyzes the trip of dc line under-voltage sensing protection(27du/dt) caused by ac system fault in Gaozhao HVDC on December 15, 2012 and June 18,2008. The paper brings in the protection enabled condition and analyzes the impact of its broadening time to 27du/dt protection. The improved scheme which adds the protection enabled condition and modifies the return voltage of boot logic is presented. The simulation results show that the scheme can avoid the fault trip of 27du/dt protection in Gaozhao HVDC.
Index Terms—AC system fault, 27du/dt protection, protection enabled condition, broadening time, protection threshold.
Huang Yi-Long and Zhou Quan are with China Southern Power Grid EHV Maintenance & Test Center, China (e-mail: sw.hyl@163.com, zhouquan236@163.com).
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Cite:Huang Yi-Long and Zhou Quan, "Analysis on the Fault Trip of 27du/dt Protection and Countermeasure in Gaozhao HVDC," International Journal of Modeling and Optimization vol. 3, no. 4, pp. 316-319, 2013.
