FIELD: electricity.
SUBSTANCE: invention can be used for remote determination of the single phase-to-ground-fault location (SEF) on ETL under operating voltage in 6-35 kV power distribution networks operating with an isolated neutral, compensating for capacitive currents or grounding the neutral through a high-ohm resistor having a radial structure. The essence of the claimed method lies in the fact that in the method of remote determination of the single phase-to-ground-fault location by unilateral measurement of the transient voltage u(t) on the damaged phase on the buses of the monitored object and the zero sequence residual current 3i0(t) of the damaged line, the rate of change of the transition current is additionally recorded, all the moments t0k of current transitions 3i0(t) through the zero value are stored, where k is the ordinal number of the current transition through the zero value. Determine and store the corresponding time t0k instantaneous values of the voltage on the damaged phase u(t0k), the rate of change of the current
, and then over the stored values of the voltage on the damaged phase u(t0k), the rate of current change and the reference value of the running inductance for the damaged line Ld determine the distance lf up to the single phase-to-ground-fault location in accordance with the expression
. In this case, in the presence of several transitions of the zero-sequence current of the faulted line through the zero value, the distance to the single phase-to-ground-fault location is defined as the average of several values of lvk.
EFFECT: increasing the accuracy of the method of determining the distance to the single phase-to-ground-fault location on the power line.
6 dwg
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Authors
Dates
2017-12-04—Published
2016-06-28—Filed