Research On Transformer Computer Protection System

Power transformer is most important electrical equipment in electric system ,and Transforms energy and voltage. Stable operation of electric system is in close touch with safe operation of power transformer.Becouse of its import people in the world always pay attention on the development of transformer protection.Now with ceaseless enlargement of electric system size and positional advance of electric system in country economy,higher demand to capability of electric system protection is also brought forward,especially reliability and speed The paper spreads research work in allusion to the demand of middle-low viltage transformer protection and development of transformer computer protection system.In the first the paper introduces basic demend of relaying protector,development of computer protection, development and status quo of transformer computer protection and the test in it.In the second the paper analyses detailedly some ways of some discrimination exciting inrush current and basic features of exciting inrush current on the base of imitatation,and improve the of braking by discrimination second harmonic. In the selection of protection algorithm All kinds of specific algorithm of sinusoidal function model algorithm and Fourier transformation algorithm are analysed and studied detailedly.Complete cycle Fourier transformation algorithm is thought to adapt to power transformer protection because of its high precision,quick reaction and utility on the base of comparing all kinds of algorithm and imitatation of complete cycle Fourier transformation algorithm.The paper introduces basic demand and arrangement of power transformer on the base of all kinds of failure and abnormal conditions of power transformer in service.On that protection arrangements of power transformer computer protection system are determined and all kinds of transformer protection principles and material paramters are told.Hardware platform by TMS320LF2407DSP of power transformer computer protector is broght forward on the base of former transformer protection project,and paper studys detailed hardware system design of protection system.Hardware performance of transformer protection system is improve by study and complex protection principle can be realized in computer system. The paper introduces systematically all kinds of software function of transformer computer protection system.and any software delevopment experience and some rules of TMS320LF2407DSP. In the end the paper has a discussion on a part of kinetic analogy test and their results.