METHOD FOR ENERGISATION OF ALTERNATING-CURRENT TRANSMISSION LINE Russian patent published in 2015 - IPC H02H3/06 H02H7/26 

FIELD: electricity.

SUBSTANCE: method is based on energising the first phase, measuring voltage at the second and third phases, checking excess by each measured voltage value of the first control value, and when the result is positive on energising of the second phase, measuring voltage at the third phase, checking excess by each measured voltage value of the second control value, and when the result is positive on energising of the third phase; if the result is negative at checking excess by voltage values measured at the second and third phases of the first control value, the next phases are not energised, the previously connected phase is deenergised, and when a signal is received on available ground fault of the energised first phase it is deenergised and the next phases are not energised; upon energisation of the second and third phases vector difference modules |U₁₂₍₁₃₎| are compared for voltage values of the first and second phases|U₁₂| and the first and third phases |U₁₃| with low control value of 0.1|U_phv|, where |U_phv| is rated phase voltage, and if condition |U₁₂₍₁₃₎|< 0.1|U_phv| is fulfilled, then fault is recorded for the first and second phases and the first and third phases respectively, thereupon the first and second phases and the third phase are deenergised respectively. Checkup of excess by the first control value of measured voltage values at the second and third phases upon energisation of the first phase and checkups of excess by the second control value of measured voltage values at the third phase upon energisation of the second phase as well as checkups of fulfilled condition |U₁₂₍₁₃₎|< 0.1|U_phv| upon comparison of vector difference modules |U₁₂₍₁₃₎| of the first and second phases |U₁₂| and the first and third phases|U₁₃|upon energisation of the second and third phases are carried out by series of N checkups in succession since the moment of energisation of the first and second phases and the third phase respectively, at that each series of checkups is made within time period, which duration is equal to N periods of the rated frequency of alternating-current transmission line, and results of checkups of the series are accepted as a bigger number of similar results in majority processing of fixed checkup results in the respective series.

EFFECT: expanded scope of application and improved safety for energisation of alternating-current transmission lines.

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