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Decifer ® PD detection algorithm


The secret of successful PD detection is to distinguish true PD signals deeply buried within the electrically
noisy environment of the substation.

From more than 10 years of experience in the analysis of permanent on-line monitoring over a wide area
electrical network (as opposed to many companies who offer spot testing equipment only), IPEC Limited
have accumulated more than 100 million real world events where our monitors have been installed to
detect partial discharges in switchgear and cables. As a result we have refined the critical process of
extracting true PD signals from the noise by the development of a completely new algorithm - Decifer ®.
Decifer ® is a partial discharge detection algorithm that identifies portions of signal as having PD.

The new algorithm works significantly better than any other algorithm currently available due to the fact that it:
BP 1
 Uses a combination of wavelet analysis and knowledge rule based expert system to distinguish
noise from partial discharge.		  
BP 2
 Has been developed to cope with data acquired from many different PD source types, in a range of
different cable builds and voltages.		  
BP 3
 Uses wave shape as well as relative position in the power cycle to classify PD.  
BP4
 Works better in noisy environments by detecting discharges with a significantly smaller amplitude
than the surrounding noise.		  
BP 5
 Improves classification of the discharge types. Decifer ® does not just rely on the main frequency of
the FFT of the signal.		  
BP 5
 Calculates discharge energy more accurately, especially in the presence of lower frequency noise.  
BP 5
 Adapts its algorithm in function of the sensor which has acquired the data. (CT, CC).  
IPEC Ltd, Rutherford House, Manchester Science Park, Manchester, M15 6GG, United Kingdom.