Abstract— Information Security is the important guarantee for the safe operation of power network in the age of global energy internet. The interconnected System of Fault Recorder has become an indispensable component of technology supporting system to analysis power grid fault. Through reviewing and analyzing on the Venezuela blackout and WannaCry ransomware, the paper points out the hidden danger in the Interconnected System of Fault Recorder. The method of using data communication gateway and port address translation (PAT), guarantees the security defense function of interconnected system of fault recorder by the sole physical and network path. Besides, multiple fault recorders could transmit information through one IP address. The feasibility and validity of this result practiced in a provincial power grid achieved good effect. Index Terms—information security; power grid dispatching system; interconnected system of fault recorder; port address translation; communication gateway; I. INTRODUCTION The fault recorder network realizes the real-time transmission of fault recording data, which provides guarantee for the reliable operation of the power grid[1]. With the improvement of the informationization level of the power grid, incidents of hackers attacking the power network such as Ukraine and Venezuela Blackouts have occurred frequently in recent years [2-3]. The security of the power grid is also facing more severe challenges. Facing the severe grid network security challenge, this paper proposes a new generation of fault recorder networked system. On the basis of improving the security protection of the fault recorder networked system, it solves a series of problems such as the IP address occupied by the existing fault recorder networked system and low connectivity. II. FAULT RECORDER NETWORKED SYSTEM WITH NETWORK SECURITY ACTIVE DEFENSE CAPABILITY The fault recorder records provides a technical basis for analyzing grid faults and handling grid incidents[4]. At present, the fault recorder networked system has be applied in two ways - independent system or based on relay protection and fault information management system. However, regardless of the construction method, there are still many problems such as low network security and occupying the IP address of the scheduling data network in actual operation. Based on the intelligent substation integrated monitoring system, the traditional fault recorder networked system problem could be resolved mainly from the following ways: 1) Connecting the fault recorder to the data communication gateway of safe partition II after centralized networking; 2) Seting up the local area network of the fault recorder station, and then useing PAT technology to reduce the number of IP addresses occupied by data transmission. The fault recorder networking scheme shown in Figure 1 is proposed: Fig.1 New Type Fault Recorder Networked System 1) The fault recorder is connected to the station control layer network; 2) PAT technology is applied to realize direct connection between the dispatching terminal and the fault recorder; 3) The integrated application server collects the fault recording data to realize the analysis of the data. III. PROGRAM IMPLEMENTATION The standardized construction scheme of the fault recorder network proposed in this paper has been applied in practical engineering such as a provincial power grid. The implementation effect shows that the communication state of the device is stable, the phenomenon of sending abnormal information does not appear, and the IP address of the scheduling data network is not over occupied. The feasibility of the proposed solution has been verified. REFERENCES [1] Luo Shaojie, Tang Jian, and Huang Wuhao. "Integrated Processing System for Grid Fault Recording Data Based on Power Data Network." Power System Protection and Control 36.16(2008). [2] Tong Xiaoyang, Wang Xiaoru. "Network Attacks Caused by Ukrainian Blackouts and Reflections on Grid Information Security." Power System Automation 40.7(2016). [3] Zhao Junhua, et al. "Inspiration from the Ukrainian incident: Preventing false data injection attacks against the power grid." Power System Automation 40.7(2016): 149-151. [4] Lai Qingyu, Liao Mingshan, and Qiu Yifeng. "Transformation of 220kV Substation Fault Recorder Communication." Electrotechnical Technology 3(2018): 113-114.

security; power grid dispatching system; interconnected system of fault recorder; port address translation; communication gateway;