| 摘要 |
<p>An instrument (1) for detecting partial electric discharges in an electric apparatus comprises: an input stage (2) set up to receive a discharge signal (3) representative of one or more partial discharge pulses and a sync signal (4) representative of an alternating voltage applied to the electric apparatus; a data processing stage (6) connected both to the input stage (2) and to an output stage (5) for receiving the discharge signal (3) and the sync signal (4), and extracting substantially in real time for each pulse detected the value of an amplitude parameter (q), correlated with a pulse amplitude, and the value of a phase parameter (f), representative of the phase of the voltage applied to the electric apparatus concurrently with the pulse, and transferring to output a processed digital signal (7) comprising the values extracted. The processing stage (6) comprises a filtering module (8) set up to disable substantially in real time the transfer to output of the values of the parameters extracted for one or more pulses, as a function of a comparing the values extracted for the amplitude and phase parameters with predetermined reference values for the amplitude and phase parameters.</p> |
