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With the application of information technology in the electricity production, increasing amount of data is generated in the power system, traditional information presentation can no longer meet the needs of production. For this reason, it is difficult for people to grasp of the current state of the electrical equipment timely and accurately. This article proposes a electrical equipment condition monitoring system based on SVG and WEB which can overcome this limitation. This system can combine the graphic display and data model effectively, reveal the current status of the equipment intuitively.

VPN technology is the use of the knowledge of cryptography in the open and public network to establish a virtual private network. IPSec VPN and SSL VPN are two kinds of VPN technology and products used in most cases currently. IPSec VPN operates at the network layer, SSL VPN works in secure sockets layer. SSL VPN uses a series of cryptographic techniques, including symmetric encryption, asymmetric encryption, digital signatures, digital certificates, as well as message digest algorithm. This article analyzes the principle of VPN technology and the SSL protocol. I proposed a solution of VPN gateway based on the SSL protocol.

With the increasing amount of data of information system, it is necessary to adjust the performance of oracle database and optimization, in order to meet the demand of long-term use of the information system's data. In this article, based on oracle database performance evaluation and influence factors analysis, we choose a method for better improvement and study of oracle memory structure, and find a way to adjust and optimize the memory allocation, after that apply it to the existing information system. Finally, through the comparison of the oracle database performance change, we come up with the idea that adjust memory allocation can improve database performance of information systems.

Informatization construction becomes an important task of today's power grid enterprises. In order to ensure the informatization implementation, to understand the impact factors of benefit and avoid reckless investment, a reasonable evaluation to the informatization investment efficiency of grid enterprise is needed. This article starts from building index system on the basis of fully understanding the actual investment situation of the grid corporation, and combined with existing information technology index system, building a scientific informatization investment efficiency evaluation index system. Then find fuzzy comprehensive evaluation method -an appropriate evaluation method by analyzing the indicator characteristics, it is a mature evaluation method, by using it we build the informatization investment efficiency of grid enterprise evaluation model, and implement it with computer technology.

Cloud computing is an emerging commercial calculation mode. The flexibility, reliability and low cost make cloud computing gradually be widely used. The government cloud is a kind of private cloud based on cloud computing which can optimize the government's systems, improve government's work efficiency and also service quality. The index management system's function includes assessment, analysis and evaluation of index operations. As a service mode of both large amount of storage and computation, the index management system needs to meet the requirement of data security and data sharing. These needs can be met well in a way based on cloud computing.