This paper forms design and calculation method and chooses optimizationdesign and calculation method of current transformer with 110kV rating voltagewhose current grade ranges from 2X 50/5 (1) A? --2X 1000/5 (1) A according to theproject condition basing in understanding the principle and structure of currenttransformer.
The paper introduced a lower computer of fault recorder and expounded its principle and structure. The lower computer took TMS320F2812 DSP chip as the core,which was fit for transformer substation of large and middle enterprise to use and was convenient for installing in local.
The necessity of replacing general travel switch by approach switch in PM full automatic press YA79-125 is elucidated through the principle and structure analysis of general travel switch and inductance type approach switch in electric system of PM press.
The principle and structure of UHV CVT,and the contents of key research for UHV CVT were introduced,such as mechanical strength and anti-seismic ability,radio influence level and electric field distribution etc. ,and the major parameters and performance index were given.
A general description of the development of harmonic elimination technique around the world, principle and structure of Active Power Filter and theory of three-phase instantaneous reactive power is given in this thesis at first.
It is discussed that the difference between traditional cascade speed controlled system and the high power factor Cascade speed controlled system on the principle and structure, the changing current rule, and inverter voltage changing rule of the inverter process.