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In the article new constructions of voltage and current transducers have been presented that are used for parameters determination of current and voltage signals in the line protected by circuit breaker. These transducers are used with protection relay that is also a subsystem of source data acquisition for multi-criteria method of circuit breaker diagnosis. Because of the multifunctionality of the device the transducers have to work with, they have to be very accurate, have wide bandwidth and be stable over varying environment conditions like temperature and humidity. As current transducers, Rogowski coils have been described. They have been made with the use of multilayer PCB technology to achieve very high repeatability of coils parameters, low labor costs as well as high bandwidth and excellent linearity. The designs of Rogowski coils have been presented together with measurement results. As voltage transducers, new constructions of reactance transducers, resistive transducers and air core transformers have been presented. The main design effort has been put into achieving wide bandwidth and good linearity. In the paper input circuits adapted to new types of voltage transducers have been described as well as measurement results.

New input circuits used for parameters determination of circuit breaker voltage and current paths