PROTECTION DEVICE FOR LOW-VOLTAGE AUTOMATIC SWITCH Russian patent published in 2005 - IPC

FIELD: power engineering, in particular, relay protection devices.

SUBSTANCE: device has three current transformers, enabled into each phase of protected network, three measuring resistors, enabled in star-shaped circuit, power and bearing displacement current source, executing organ, three two-semi-period bridge rectifiers, OR element, three two-input AND-NOT elements, two three-input AND elements and comparator.

EFFECT: higher stability of activation, speed of operation, operation comforts settings.

1 dwg, 1 tbl