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Abstract

The paper proposes a method for determining the insulation parameters in symmetrical network of voltage above 1000 V of power plants’ own needs, based on the measurement values of modules of zero-sequence voltage and phase-toearth voltage before and after connection of additional active conductivity between this phase of the electrical network and earth. The researches of the developed method of determining the insulation parameters in symmetrical network of voltage above 1000 V of power plants own
needs on the reliability were conducted.Where in the application of the method for determining the insulation parameters in symmetric networks with voltage of 6 kV of power plants’ own needs, based on the analysis of errors for each specific network the magnitude of the additional active conductivity is selected, thus to provide the required satisfactory accuracy in the determination. The error analysis showed that the developed method provides satisfactory accuracy in determining the insulation parameters in an existing electrical installation with voltage 6 kV of own needs of thermal power plants.