Short circuit surveillance protection system

Japanese Patent JP6210299

B2

PROBLEM TO BE SOLVED: To prevent unnecessary cutoff of a cable by using power information on the cable in power generation of a distribution type power supply, regardless of a grounded system or non-grounded system.SOLUTION: An electric leak monitoring and protection system comprises: a first cable Dand second cable Dwhose primary sides are connected to the secondary side of a distribution transformer and which branch out; first open/close means Efor performing opening operation when electric leak occurs in the first cable; second open/close means Efor performing opening operation when electric leak occurs in the second cable; effective power calculation means H based on voltage and current in the first cable; direction determination means I for outputting an operation delay instruction Sby determining inverse load flow power made from effective power flowing toward a branch point of the first and second cables; and delay means J for making the opening operation of the first open/close means be later by prescribed time than the opening operation of the second open/close means, by using the operation delay instruction S. A first load to which power is supplied from a power system and a distribution type power supply interconnected with the power system are connected to the first cable; a second load to which power is supplied from the power system is connected to the second cable.

JPS5532446	REVERSE TIME LIMIT CIRCUIT
JP2011160517	OVERCURRENT PROTECTION CIRCUIT, AND SWITCHING POWER SUPPLY DEVICE

Satoshi Machida
Toshiaki Tani

JP2013245871A

October 11, 2017

November 28, 2013

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Fuji Electric Equipment Control Co., Ltd.

H02H3/093; G01R31/02; H02H3/08

JP2001224129A
JP2003158820A
JP9135535A

Yuichi Morita

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