RELAY OF DIFFERENCE IN FREQUENCIES OF GENERATORS CONNECTED FOR PARALLEL OPERATION Russian patent published in 2012 - IPC H02J3/40 

FIELD: electricity.

SUBSTANCE: relay of difference in frequencies of generators connected for parallel operation comprises a subtractor, two comparators, two actuating elements, an inverter, the third comparator and a gate multivibrator, an element of signal delay, two differentiators, an integrator, a rooting unit and a divider.

EFFECT: higher accuracy of synchronisation by frequency of generators connected for parallel operation due to variation of a sequence of input signals conversion, which makes it possible to increase accuracy of detection of mismatch in frequency of generators connected for parallel operation and as a result to increase accuracy of synchronisation of these parameters of a board grid voltage twice.

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