METHOD OF CONTROLLING THREE-PHASE ELECTRIC MAINS INSULATION CONDITION Russian patent published in 2013 - IPC G01R27/18 

FIELD: electrical engineering.

SUBSTANCE: method is based on simultaneous measurement of voltages of the mains three part relative to the earth within the distribution gear bus section and of the three phases currents at the beginning of each line branching off the bus section. The measurements are preformed in the regular mode of the mains operation and immediately after creation of artificial asymmetry of phase voltages relative to the earth by way of transient connection of an additional conductance to the earth to one of the phases in the bus section. Relying on the measurements results, one calculates the degree of voltage fluctuation due to the asymmetry creation and increment of average power value thereby occurring (for each line being controlled). Then one calculates resistance of insulation of the phases being controlled with the load connected with the results transmitted to the data concentrator for the electric mains insulation diagnostics and condition forecast to be carried out relying thereon.

EFFECT: ensuring the possibility of operational control over insulation condition, diagnostics and forecast of condition of a group of objects within the electric mains.

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