FIELD: electric power engineering.
SUBSTANCE: use: in electric power engineering. Current protection device is equipped with module for calculating asymmetry of phases conductivities to ground lines, first input of module is connected with conductivity measurement sensor of line relative to earth, its second input is connected with measuring voltage transformer, and output is connected to third input of module for calculating coefficient of incomplete ground contact.
EFFECT: technical result consists in improved efficiency of current protection against single-phase ground contacts occurring through transition resistance due to correction of protection operation algorithm according to conductivities asymmetry value of phase lines relative to earth.
1 cl, 1 dwg
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