Reliability and economic - costs of the distributive network depends upon the quality of the maintenance like: fast and expeditiously elimination of faults or systematic network renovation. In the isolated network, where are full untreated trees, could be multifold repetitive earth - faults and they could call two or three - phase short - circuit. Such places of the power line could be found by the fast processes analysis monitoring device, mounted in the substation of this power line. In the compensated power line conventional relay devices often faulty shows which feeder is short - grounded. Having such unreliable information there are chance to disconnect healthy feeder with multiple actuation. They are very dangerous commutations, which could affect great overvoltage. Technology of the fast process recognition allows avoid such harmful and faulty operations. For the fast fault localization after the one phase to ground fault, it is good to know in which place of the network it has happened. The analysis of the steady - state modes let us know only the distance till the one phase to ground fault place. A distributive network has specific asymmetric voltage and higher level harmonics. In fully computer - assisted power network, before any commutation, monitoring system has to perform analysis of stationary modes possible plan, which could arise after commutations and to find optimal switching variation [10].
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