Safety monitoring in flowing water stage for the emergency water supply project in Beijing-Shijiazhuang section of middle route of South to north water diversion
The main channel length is about 307.422km for the emergency water supply project in Beijing-Shijiazhuang section of middle route of South to north water diversion,south to the ancient canal on the south of Hutuo river in Hebei province and north to Tuancheng lake in Beijing city.By analyzing the monitoring data results of these buildings along the channel during the temporary flowing water stage,the paper estimates the security of these buildings,which could provide the running basis for the operation and management apartment and the reference for the design and construction of the similar projects.
The voltage characteristics of the fault phase in the shunt reactor and the neutral point reactor are analyzed for the EHV transmission lines with shunt reactors. The study shows that in the case of solid permanent grounding, the ratio of the voltage in the fault phase shunt reactor to the voltage in the neutral point reactor is always larger than that for transient faults. Based on the above finding, a method using the voltage in the shunt reactor and neutral point reactor to identify the fault nature is proposed for the single-phase adaptive reclosure of transmission lines with the shunt reactors. EMTP simulation results show that the proposed method is correct and efficient in realizing single-phase adaptive reclosure of EHV transmission lines.