MICROPROCESSOR PROTECTION SYSTEM Russian patent published in 2001 - IPC

FIELD: electrical engineering, relay protection of objects. SUBSTANCE: microprocessor protection system incorporates units of galvanic isolation and preliminary scaling of input signals in the form of current and voltage, unit of frequency filters, analog-to-digital converter, microprocessor system controlling output relays and signalling in correspondence with protection algorithms, former of signals of test and diagnostics. Proposed protection system is required for execution of functions of relay protection, automatics, measurement, oscillogram taking, recording, control and test of connections and is intended for installation in units of factory-assembled switch-gear of input, sectional, feeder switches, transformers and electric motors. EFFECT: raised reliability of protection system thanks to better organization of test and diagnostics of input circuits ( secondary windings of current and voltage transformers ). 5 dwg