SYNCHRONIZING RELAY Russian patent published in 2004 - IPC

FIELD: electrical engineering; synchronizing relays affording automatic turn-on of synchronous generators.

SUBSTANCE: device has input voltage rectifier whose input is connected to supply voltage input; synchronized voltage rectifier whose input is connected to generator voltage input; first and second algebraic adders; first and second constant-factor multipliers; first and second inverters; first through fifth comparators, first comparator being made in the form of zero-threshold comparator; first and second final elements; input-voltage frequency meter; synchronized-voltage frequency meter; first through fifth AND gates; first and second square-pulse shapers; short-pulse train shaper; phase detector; integrating amplifier; low-pass filter; clock generator; first and second delay circuits; first and second pulse counters; memory register; and constant factor shaping unit; input and synchronized signal frequency meters function to convert input and synchronized signals in compliance with mathematical expression U₀ = A₀/f₀, U_s = A_s/f_s, where U₀ is signal at input of synchronized-voltage frequency meter; f₀ is synchronized-voltage frequency; A₀ and A_s are scale parameters proportional to amplitudes of input and synchronized voltages, respectively; input and synchronized voltage rectifiers function to convert voltage into values proportional to their amplitudes and equal to A₀ and A_s, respectively; output of second pulse counter functions as synchronizing relay output.

EFFECT: enlarged functional capabilities.

1 cl, 3 dwg