Current Distribution Features in 500 kV Substation Considering Contact Resistance Variations
One and a half main wiring connection is mostly used in 500 kV substations,which has a certain margin to upgrade transmission line capacity.This paper calculated transfer function matrix of main wiring connection of 500 kV substation.Therefore distribution features between each switch in each string and every current source were unrevealed; meanwhile,current distribution changes via changes of current sources were explored.Actual measurement exposes the relationship between contact resistances of HV circuit breakers and current,pressure,temperature,mechanical action times,and product types.Linear curve fitting of actual measurement was conducted and fitting formulas were defined.PSCAD simulation model of 500 kV substations under equal contact resistances circumstances was revised considering contact resistance variations in order to draw a more precise conclusion.
500kV substationtransfer function matrixcontact resistancelinear curve fitting
NETL
NSTL
万方数据
