DEVICE FOR PROTECTION AGAINST SINGLE-PHASE SHORT CIRCUITS IN 0,4 kV NETWORK Russian patent published in 2024 - IPC H02H3/13 

FIELD: electrical engineering.

SUBSTANCE: known device for protection against single-phase short circuits of 0.4 kV network, comprising a leakage current meter and phase current meters, is equipped with first, second and third current transformers of phases A, B, C, six diode bridges and three electromagnetic releases, wherein leakage current meter is made in form of isolating transformer installed in neutral line N, in secondary circuits of which there are first, second and third current transformers of phases A, B, C, to the secondary circuits of which the first, second and third diode bridges are connected, connected to the secondary protection circuits, phase current meters are made in form of fourth, fifth and sixth current transformers installed in phase conductors A, B, C, to the secondary circuits of which the fourth, fifth and sixth diode bridges are connected, connected to the secondary protection circuits in opposition to the first, second and third diode bridges, respectively, in secondary protection circuits to diode bridges of each phase own magnetic release is connected.

EFFECT: invention is aimed at simplification of implementation of protection against single-phase short circuits in 0.4 kV network with simultaneous increase of its reliability and validity.

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