This paper discusses ways of improving processing accuracy of economic numerically controlled lathe based on the study of numerically controlled programming and revision and software rocker compensation, and lays stress on the quasi-closed loop software compensating methods of the mechanical rocker.

Introduces the types of OCS compensation devices and their application in the development of electrified railways and urban mass transit system in aspects of product materials, manufacturing techniques, structural characteristics and the characteristics, proposes to popularize and use the ratchet wheel gear device, spring compensator and the hydro-pneumatic tensioning compensator.

The article analyzes the principle and influencing factors of flicker,and the compensation devices are put forward to suppress voltage fluctuation and flicker effectively.

The structure, principle and application and on the basis of line selection of the intellctual regulating compensating device to ground are introduced.

Research on shield voltage compensation unit of power cable;

In this paper,the characteristic of new type control system of PFC(power factor compensator) of electric locomotive is briefly described,the test is analysed in detail.