SHORT CIRCUIT PROTECTION DEVICE FOR n CONNECTIONS BRANCHED FROM COMMON BUSES Russian patent published in 2015 - IPC H02H7/00 H02H7/22 H02H3/26 

FIELD: electricity.

SUBSTANCE: device contains n substation connections protected from short circuits containing for each phase of 1^st, …, n^th connection a current sensor installed in the split of the conductor phase, a rectifier connected to a current sensor, a subtracter connected to the rectifier, an amplifier and a divider connected to the subtracter, the first comparison circuit connected to the amplifier and the rectifier, the second comparison circuit connected to the divider and the rectifier, the AND element connected to the first and the second comparison circuit, for each of connections - by the OR element connected to the respective elements AND, and the executive body connected to the OR element, and by the output in the switch shutdown circuit of the respective connection, the linear voltage monitoring unit connected by the output to each AND element, the adder common for the group of homonymous phases, with the inputs connected to rectifiers, and with outputs - to subtracters.

EFFECT: improvement of sensitivity of the device and expansion of scope of its application.

1 dwg