Kuz'menko D. The improvement of the automatic phase shunting in the conditions of grounds in power network 6-10 kV.

The researching object are processes in systems of power supply 6-10 кV at the earth-fault of phase. The researching purpose is perfection the automatic by-passing of phase at the earth-faults in networks 6-10 кV due the exception of overvoltages at commutations of switches and sensitization defence. Theoretical researches are based on the basic laws of electrical engineering, methods of calculable mathematics for numeral design of transients in electric systems at earth-faults. For experimental researches of processes of shorting phase on earth physical models were uzed. The mathematical models of networks with isolated or resonance-earthed neutral for analysing of the modes of shorting of phase on earth which differs the account of commutations of bypass switch were developed in dissertation, influences of the state of this switch and work-load of the damaged feeder, on the current of a zero sequence in this feeder. The method of searching of the damaged feeder was improved by the by turn disconnecting of switches of feeders, which differs determination of the damaged phase, by-passing, measuring of phase of current in the circuit of this switch, next by turn disconnecting of switches of feeders and determination of the damaged feeder its auxiliary switch, on the change of phase of current on a capacity on the basis of it . The relay protecting from the earth-faults of phase, at the use of the automatic by-passing of the damaged phase due to the auxiliary measuring the active constituent of residual current in all of feeders and bypass switch was suggested to perfect. The mode of operations of arc-suppressing reactor with biasing due to that in default of earth-fault it was shown out of the resonance tuning, and at appearance of earth-fault shunt a switch the damaged phase, the change of biasing is arrive at the resonance tuning, whereupon disconnect a bypass switch was suggested to perfect. The method of determination of the damaged feeder at the monophase earth-faults of phase and sensitization defence was accepted to introduction in "Lugansk power association". Branch - electrical engineering.