METHOD OF DOUBLE-SIDED WAVE DETERMINATION OF SINGLE-PHASE SHORT CIRCUIT LOCATION ON POWER TRANSMISSION LINE WITH BRANCHES Russian patent published in 2024 - IPC G01R31/08 

FIELD: electrical engineering; measuring.

SUBSTANCE: invention relates to measurements in the field of electrical engineering. In each of the two devices installed at the ends of the power transmission line, based on the duration of the interval between the moments of arrival of the primary waves to the devices, the distance to the assumed point of the single-phase short-circuit on the power transmission line is determined and compared with the distances to the branches. If the distance to the expected point of the single-phase short-circuit on the power transmission line is not equal to the distance to any of the branches, then it is taken as true. Otherwise, one of the branches is taken as the damaged one, the distance to which is equal to the distance to the said expected point of the single-phase short-circuit, and the moments of arrival of waves following the primary are recorded, duration of intervals between them and the moment of arrival of the primary wave to the device are estimated. Information is received through information transmission channels from another device about durations of intervals between the moments of arrival of waves to it following the primary one and the moment of arrival of the primary wave. Pairs of equal durations are identified among said durations of intervals of two devices and the interval between the moment of arrival of the wave with maximum amplitude and the moment of arrival of the primary wave to the device is selected from these pairs and taken as the working interval. True distance to the point of the single-phase short-circuit is the distance to the point in the damaged branch, to which the wave from the transformer in the damaged branch reaches for half the operating interval.

EFFECT: high accuracy of determining the distance to the point of single-phase short circuit (SC) on a power transmission line (PTL) with branches.

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