MICROPROCESSOR MULTIFUNCTIONAL DEVICE OF FREQUENCY RELAY Russian patent published in 2001 - IPC

FIELD: measurement technology. SUBSTANCE: given device is intended for installation in relay compartments, in panels and cabinets in relay rooms and control desks of electric power stations, microprocessor stations and in other facilities. Technical result consists in increase of operational reliability of device due to insertion of diagnostics and testing of key input units, in expansion of functional capabilities thanks to use of measurement of rate of frequency change and effective voltage and in insertion of functions of automatic unloading, automatic limitation of frequency rise, automatic repeat frequency switching on with possibility of control over voltage and many other functions. Device includes scale amplifier, analog-to-digital converter, comparator, inhibition unit, microprocessor, two storage registers, microprocessor system and input/output unit. Proposed device is meant to measure parameters of electric network and to organize frequency unloading of various power systems under conditions of emergency deficit of active power. EFFECT: increased operational reliability of device. 4 dwg