On the basis of analysis of some problems in fitting of sensor characteristic curve,a new method concerned with meliorative modification of measuring data is given in order to eliminate the measuring error of original data.

Aiming at the problem that maintenance decision is made just according to reliability,maintenance costs or operation condition in power stations,and the whole maintenance optimization can not be realized,a frame of risk-based maintenance decision is suggested.

This paper briefly introduced the basic model and method of the maintenance optimization and management technology that Thermal Power Research Institute developed and applied.

Maintenance optimization depends on correct and timely supply of information.

This system uses star schema as structural model,takes basic parameters and operation information as data infrastructure,maintenance optimization and schedule as the core process,integer programming optimization model for the calculation of tool,and covers operation data management,maintenance optimization management,system management,and other functional modules.

Idea of developing maintenance optimization in hydroelectric power plant;

The development of condition-based maintenance(CBM) and maintenance optimization(MO) in Chinese thermal power plants in recent years are reviewed according to summing-up a great deal of papers published in China and research results of authors of this paper.

According to the needs for optimal maintenance of equipment in the power plant,the condition monitoring and diagnosis system of vacuum circuit breaker is studied.