METHOD OF PROTECTION FROM THE RECEIVING SIDE OF TWO PARALLEL LINES WITH ONE-SIDED POWER SUPPLY Russian patent published in 2017 - IPC H02H7/22 

FIELD: electricity.

SUBSTANCE: instantaneous values of the current i₁ and i₂ are measured on the first and second lines in the positive and negative half-waves of the current as the current rises. Then, the instantaneous current value in the first line i₁ with a given value of the current i_st, and for i₁= i_st, continuing to measure i₁, the time ti₁ is counted until the moment when the next positive/negative half-wave current under the current i₁= i_st buildup. Then the countdown is repeated, comparing t₁ with the first t_st1 and the second t_st2 given to the values of time, and if t₁≤t_st1 or t₁≥t_st2, then the switch of the first line is turned off. Simultaneously, the instantaneous current value in the second line i₂ is compared with a given value of the current i_st, and for i₂= i_st, continuing to measure i₂, the time t₂ is began to be counted until the moment when the next positive/negative half-wave current under the current i₂= i_at buildup. Then repeat the countdown, compare t₂ with the first t_et1 and t _et2 second specified values of time, and if t₂≤t_et1 or t₂≥t_et2, turn off power switch of the second line.

EFFECT: increased security reliability from the receiving side of two parallel lines with one-sided power supply.

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