SINGLE-CIRCUIT POWER TRANSMISSION LINE OF HIGH OR ULTRAHIGH VOLTAGE Russian patent published in 2024 - IPC H02J3/26 H02G7/20 

FIELD: technique of electric power transmission by alternating current.

SUBSTANCE: invention relates to high or ultrahigh voltage power transmission lines. Single-circuit power transmission line of high or ultra-high voltage contains two normal working phases and one working phase consisting of two half-phases, one of which in long-term post-emergency modes is used as a backup phase. Line is made with single transposition of half-phases. Balancing of post-emergency modes is carried out by means of transposition of half-phases. In case of stable damage of one of the half-phases, it is switched off and the line switches to operation in post-emergency mode with possibility of transferring at least 50% of power of initial maximum mode. In case of stable damage of normal operating phase, it is switched off and one of half-phases is switched on instead of it in post-emergency mode, note here that at least 50% of initial maximum mode power can be transmitted via the line.

EFFECT: providing an acceptable level of asymmetry both in the initial normal mode and in post-emergency modes occurring in case of stable single-phase faults on the line.

1 cl, 3 dwg