Nanayakkara A. The improvement of the operation modes of the 6 kV power supply networks of power stations auxiliaries at the phase-to-ground faults.

Object of research are processes in systems of electro supply of auxiliaries. Power stations. The purpose of work - increase of reliability of networks 6 кV auxiliaries. thermo-electric and the atomic power station at short circuits of a phase on the ground. Methods of research are based on the theory of transients in electric systems, mathematical modelling. It is developed: 1) mathematical model of a network 6 кV auxiliaries. Power stations with the connecting transformer and current limiting resistor, 2) the device of a choice of the damaged phase for its automatic connection with the ground; 3) a way of decrease(reduction) of thermal heating of terminators over voltage in modes of short circuit of a phase on the ground. Established frequency rates over voltage from parameters of a network and influence of a current of the resistor on character of course of arc short circuit. Circuits and devices of restriction over voltage transferred on Kurahovckaya thermo-power stations for introduction. Sphere o f use are systems auxiliaries. Power stations.