FIELD: power engineering.
SUBSTANCE: invention relates to electric power engineering and can be used for remote determination in on-line mode of damage point at all types of single-phase earth faults in cable networks with voltage of 6–10 kV. Essence: fixing at feeder input phase voltages uA, uB, uC and zero sequence current 3i0. Detecting damaged phase. Using n feeder models in phase coordinates with given different values of distance to single-phase ground fault lf1, lf2, … lfn, where n≥3. Single-phase ground fault is simulated in each feeder model on the detected damaged phase. Input of measured phase voltages uA, uB, uC. Input phase currents of each model are transformed to zero-sequence input currents 3î01=îA1+îB1+îC1, 3î02=îA2+îB2+îC2, 3î0n=îAn+îBn+îCn. Separating the zero sequence current at the input of feeder 3i0 and input zero-sequence currents 3î01, 3î02, …3î0n of each feeder model high-frequency components. At the specified time interval of observation from the moment of occurrence of earth fault of the value of the discrepancy is determined ε1, ε2, … εn high-frequency zero-sequence current components at input of feeder 3i0 and high-frequency components of zero-sequence input currents of each model 3î01, 3î02, …3î0n. Obtained discrepancy values are used to approximate dependence ε=ƒ(ls) and calculating distance to prospective point of damage lf.calc, at which value of discrepancy ε minimum.
EFFECT: high accuracy of determining the point of damage.
1 cl, 6 dwg
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Authors
Dates
2019-07-22—Published
2018-10-04—Filed