To solve the problem of reduced transfer capability of local power grids,which is caused by structure irritation,line protection sensitivity and so on,several protection configuration schemes are proposed.

Design of main protection configuration scheme for hydro-generator;

Optimization of main protection configuration scheme for hydro-generators from 100 to 300 MW;

Importance of quantitative and optimum design of main protection configuration scheme for large and medium generator;

Discussion on protection scheme for 110kV ring network during pilot protection shutdown;

By use of characteristics of internal and external faults, a new fast protection scheme for double lines on same tower, which can accurately distinguish faults within the protection zone from those outside the protection zone, is proposed.

Aiming at electric metering error caused by the difference between rated secondary load and actual secondary operating load of high voltages metering box voltage transformer,through simulating different load,the influence of secondary circuit load on metering error are analyzed,and the reasonable load allocation scheme are putted forward.

A new distributed allocation scheme of voltage transfo rm er is submitted, through which normal schemes are analyzed for 220 kV voltage tr a nsformer of 500,220 kV substations.