Power transmission system with current limiting device

H - Electricity – 02 – H

Patent

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Details

348/44, 317/6

H02H 7/22 (2006.01) H02B 1/24 (2006.01)

Patent

CA 1261388

ABSTRACT OF THE DISCLOSURE A power transmission system having a plurality of power transmission stations for transmitting power from a power-receiv- ing line to respective branch circuits wherein each power trans- mission station includes a protection circuit providing a current path for transmitting power to or receiving power from other sta- tions. Each protection circuit has a series circuit of a current limiting breaker and a current detector and a bypass switch in parallel with the series circuit. When operation of one station is selectively interrupted to allow inspection, for example, of the main transformer, the bypass switch of the one station is closed to provide a current path for the associated branch cir- cults from the other stations that bypasses the associated current limiting breaker which otherwise would be required to pass full load current of all the associated branch circuits. By the provision of the bypass switches, current limiting breakers having lower rated current capacity may be employed without loss of circuit protection, which is provided by other breakers in the system.

470229

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