A physical isolation system based on PCI (peripheral component interconnect),embedded with intelligence card technology, strong identity authentication technology and securityaudit, etc., is introduced. The system can...A physical isolation system based on PCI (peripheral component interconnect),embedded with intelligence card technology, strong identity authentication technology and securityaudit, etc., is introduced. The system can physically isolate the internaland external networks. Thehardware of the system, including PCI interface control circuits, network interface circuits andlogic control circuits, is designed to automatically adapt its operation speed and mode to thenetwork and securely isolate the internal and external networks; the software of the system,including the security strategy management module, the security audit module, the database recordexchanging module, the file exchanging module and the mail exchanging module, is designed toefficiently exchange and manage the data transference between the internal and external networks.Also the driver of the system is implemented with Windows driver development kits (DDK) based onNetwork Driver Interface Specification (NDIS). The prototype ofthe system developed has beenemployed in the Police Fire Protection Bureau of Hubei Province, which performs consistently andefficiently. The technological cruxes discussed have practical values for related subjects.展开更多
基于电压源型换流器的高压直流输电(voltage sourced converter based HVDC,VSC-HVDC)是一种以电压源换流器、自关断器件为基础的高压直流输电技术,其换流阀价格昂贵,需要进行必要合理的保护来保证换流阀的安全运行。内部交流母线故障...基于电压源型换流器的高压直流输电(voltage sourced converter based HVDC,VSC-HVDC)是一种以电压源换流器、自关断器件为基础的高压直流输电技术,其换流阀价格昂贵,需要进行必要合理的保护来保证换流阀的安全运行。内部交流母线故障是换流站内部一种严重的故障形式,因此,有必要对该故障进行分析从而进行保护设计。分析了内部交流母线故障的故障机制,同时针对故障换流站不同控制方式、不同运行模式下,非故障站的动作配合进行了深入的研究。通过在PSCAD/EMTDC中建立相应的电磁暂态模型,对内部交流母线故障进行了详细的模拟,给出了分析验证。结合不同应用下的系统运行要求,提出了故障后相应的两站保护动作配合要求。展开更多
文摘A physical isolation system based on PCI (peripheral component interconnect),embedded with intelligence card technology, strong identity authentication technology and securityaudit, etc., is introduced. The system can physically isolate the internaland external networks. Thehardware of the system, including PCI interface control circuits, network interface circuits andlogic control circuits, is designed to automatically adapt its operation speed and mode to thenetwork and securely isolate the internal and external networks; the software of the system,including the security strategy management module, the security audit module, the database recordexchanging module, the file exchanging module and the mail exchanging module, is designed toefficiently exchange and manage the data transference between the internal and external networks.Also the driver of the system is implemented with Windows driver development kits (DDK) based onNetwork Driver Interface Specification (NDIS). The prototype ofthe system developed has beenemployed in the Police Fire Protection Bureau of Hubei Province, which performs consistently andefficiently. The technological cruxes discussed have practical values for related subjects.
文摘基于电压源型换流器的高压直流输电(voltage sourced converter based HVDC,VSC-HVDC)是一种以电压源换流器、自关断器件为基础的高压直流输电技术,其换流阀价格昂贵,需要进行必要合理的保护来保证换流阀的安全运行。内部交流母线故障是换流站内部一种严重的故障形式,因此,有必要对该故障进行分析从而进行保护设计。分析了内部交流母线故障的故障机制,同时针对故障换流站不同控制方式、不同运行模式下,非故障站的动作配合进行了深入的研究。通过在PSCAD/EMTDC中建立相应的电磁暂态模型,对内部交流母线故障进行了详细的模拟,给出了分析验证。结合不同应用下的系统运行要求,提出了故障后相应的两站保护动作配合要求。
