FREQUENCY RELAY Russian patent published in 2005 - IPC

FIELD: electrical engineering; electronic frequency relays.

SUBSTANCE: proposed frequency relay that performs two functions of frequency increase and decrease has frequency-dependent component, three threshold units, two AND gates, reversing counter, final component, clock generator, pulse frequency divider, and monostable multivibrator; input of frequency-dependent component functions as input of frequency under check; monostable multivibrator input functions as trigger input of frequency relay; frequency-dependent component has gain-frequency response with its first maximum corresponding to minimal admissible value f_adm plus deviation of frequency under check from rated value, with its second maximum corresponding to minimal admissible f_adm plus deviation of frequency under check from nominal value, and with its minimum disposed between first and second maximums and corresponding to nominal value f_n of frequency under check.

EFFECT: enlarged functional capabilities.

1 cl, 3 dwg