Techimp Technologies S.r.l.

Techimp Hq S.r.l.

Fabiano Bettio

Gian Carlo Montanari

Stefano Serra

Andrea Cavallini

Gaetano Pasini

Francesco Puletti

Dario Andreani

An instrument for detecting partial electric discharges includes: an input stage set up to receive a discharge signal representative of one or more partial discharge pulses and a sync signal representative of an alternating voltage applied to the electric apparatus; a data processing stage for receiving the discharge signal and the sync signal, and extracting substantially in real time for each pulse detected the value of an amplitude parameter, correlated with a pulse amplitude, and the value of a phase parameter, representative of the phase of the voltage applied to the electric apparatus concurrently with the pulse, and transferring to output a processed digital signal including the values extracted. The processing stage includes a filtering module set up to disable substantially in real time the transfer to output of the values of the parameters extracted for one or more pulses.

Instrument and method for detecting partial electric discharges in an electric apparatus

An instrument () and a method for detecting partial electric discharges involve acquiring a discharge signal (), for example picked up by a direct-measuring impedance device () through a broadband HF acquisition channel (), and acquiring the discharge signal () in a narrowband LF acquisition channel () complying with regulations, using on the LF acquisition channel () a trigger controlled in slave mode by a trigger of the broadband HF acquisition channel (); they also involve acquiring another discharge signal () picked up by an indirect-measuring impedance device () through a second narrowband LF acquisition channel (A) and comparing digital signals (A) generated in the first and second LF acquisition channels (A), in order to generate a balanced digital signal () without components representative of common mode electrical signals present in the measuring circuit.

Instrument and method for detecting partial electrical discharges

An instrument () and a method for measuring pulses of partial electrical discharges in an electrical system comprise data processing means () operatively associated both with an input stage (), able to receive an analogue signal () representing said pulses and to provide a digital representation of the entire wave form of the pulses, to receive said digital representation, extract the value of predetermined parameters relating to the wave form of the pulses and transfer to and output stage () a processed digital signal comprising said values, the processing means () being able to operate substantially in real time, i.e. with no need for a memory for the intermediate storage of the data. Known solutions within the field of the measurement of partial discharge pulses for diagnostic purposes provide for the use of peak detector instruments, which are not able to measure all information useful for a diagnosis of the electrical system, and oscilloscopes interacting with a computer, disadvantageous in terms of costs and of calculation efficiency.

Instrument and method for measuring partial electrical discharges in an electrical system

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Monte San Pietro, Italy

Fabiano Bettio