METHOD AND APPARATUS FOR CONTROLLING SECONDARY CIRCUIT MEASURING TRANSFORMER IN ELECTRIC POWER SYSTEM Russian patent published in 2012 - IPC G01R31/06 

FIELD: physics.

SUBSTANCE: signal perturbations from the measuring transformer are detected using a protective intelligent electronic device (IED) which is connected to the secondary circuit of the measuring transformer and protects the electric power system component. Fault in the secondary circuit of the measuring transformer is detected in accordance with the result of detecting violation of the operating mode obtained from the protective IED and another result of detecting violation of the operating mode obtained from at least another protective IED. Other protective IED include protective IED connected to other secondary circuits of the measuring transformer or secondary circuits of another measuring transformer connected to the electric power system component, and the protective IED which are connected to the other measuring transformers, connected to other electric power system components, are connected to the same electric bus with which the electric power system component is connected.

EFFECT: providing more a reliable and sensitive operating mode with a small amount of information gathered.

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