System for limiting short circuit current in 3-phase electric po

Details System for limiting short circuit current in 3-phase electric po System for limiting short circuit current in 3-phase electric po

1996-07-17

1998-05-05

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 20, H02H 708

Patent

active

057484236

ABSTRACT:
An arrangement (1) for limiting the short-circuit current in a three-phase electric power line connected with one or more motors/generators (2) in which in each power line phase (3) leading to the generator/motor (2) at least one pair of series switches (4) are disposed, which are formed by semiconductor switch elements connected in anti-parallel, and in the section between the series switches (4) and the generator/motor (2) elements such as short-circuiting switches (6) are disposed which in case of a short-circuit cause the current of the generator (2) to be shunted away such that the operation of the series switches (4) is assured and the current cannot get into the power line. With the very simple structure of the system, very fast switching times are achieved.

REFERENCES:
patent: 4602199 (1986-07-01), Walker
patent: 4710841 (1987-12-01), Bottrell
patent: 5210685 (1993-05-01), Rosa
patent: 5570260 (1996-10-01), Kanai et al.

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