Distribution Network Security Protection System

The main application of10KV substation distribution network, the distributionnetwork is directly related to the industrial and civil electrical safety, power distributionnetwork fault will cause the city a large area blackout accident, seriously affectingpeople’s life and economic development. Therefore developed to meet safety equipmentdistribution network application is very important. Safety protection system in ChinaSouthern Power Grid by the master safety protection device and the terminal securitydevice and digital certificate system. The safety protection device is deployed in thepower supply bureau, terminal security protection device deployment station, powerdistribution box in the distribution and wire rod, through the optical fiber ring networkor wireless network and host security protection device of electric power systemcommunication.The safety protection device has the function of firewall, data content identificationand diagnosis function, ensure that only conform to the101/104protocol data toback-end business system, ensure the back-end business systems from attack andintrusion; network data packets arrival station safety protection device, firewall moduleprotective equipment firstly identify packet, if not encrypted data package, can bediscarded according to the default strategy. The data packet through the firewall afterVPN treatment, VPN treatment reduced the data after the101/104protocol data analysis,only through the message can be sent to the back-end business system101/104protocoldata analysis.Safety protection chip terminal safety device adopts SoC architecture, whichintegrates a high performance CPU, rich interface (2mesh and2RS232serial port) andthe dense SM1/2/3algorithm, is currently the industry’s most versatile a cipher SoCchip; terminal security protection device support multiple communication links,including serial link, link and GPRS wireless access, access application makes terminalsafety device support all kinds of distribution network terminal.Safety protection system in China Southern Power Grid to achieve the highperformance in the premise of ensuring the encryption function, realizes the VPN tunnelfunction; to prevent malicious intruders through the encrypted tunnel malicious accessor attack on the intranet host; the effective realization of the safety protective work encrypted tunnel can, to prevent replay attacks; system safety protection equipmentworking state query, the terminal security protection device to realize the healthmonitoring and alarm query; also has the function of log audit. Safety protection systemcan work safely and reliably, can the confidentiality, integrity, authenticity, the effectiveprotection of China Southern Power Grid in the power supply bureau distributionnetwork automation system of business data, prevent all kinds of terminal equipment toattack and invasion to the host equipment, to ensure healthy and stable operation ofpower distribution network.