METHOD FOR PROCESSING DATA PERTAINING TO AN ACTIVITY OF PARTIAL ELECTRICAL DISCHARGES
First Claim
1. A method for processing data pertaining to an activity of partial electrical discharges taking place in a threephase electric machine (1) powered with square wave voltage, said data comprising a plurality of discharge signals associated with said partial electrical discharges and a plurality of sets of three values (e_{U}, e_{V}, e_{W}) of power supply voltage of the machine (1), each set measured in concurrence with a corresponding discharge signal,characterised in that it comprises the following steps:
 transforming each set (e_{U}, e_{V}, e_{W}) of three voltage values measured into a corresponding pair (e_{d}, e_{q}) of voltage values;
deriving a phase value from each of said pairs (e_{d}, e_{q}) of voltage values;
attributing to each discharge signal associated with a corresponding partial electrical discharge the corresponding phase value, to assess the measured discharge signals as a function of corresponding phase values.
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Accused Products
Abstract
A method for measuring and processing data pertaining to an activity of partial electrical discharges taking place in a threephase electric machine (1) powered with square wave voltage, said data comprising a plurality of discharge signals and a plurality of sets of three values (e_{u}, e_{v}, e_{w}) of power supply voltage of the machine measured in concurrence with a corresponding discharge signal, comprises the following steps: transforming each set (e_{u}, e_{v}, e_{w}) of three voltage values measured into a corresponding pair (e_{d}, e_{q}) of voltage values; deriving a phase angle value from each of said pairs (e_{d}, e_{q}) of voltage values; attributing to each discharge signal the corresponding phase value, to assess the measured discharge signals as a function of corresponding phase values. Prior art techniques for processing data pertaining to activity of partial electrical discharges taking place in three phase electric machines powered with square wave voltage provide for assessing the measured discharged signals as a time sequence of events, with no possibility to place them effectively in relation to the power supply voltages, this entailing that any subsequent statistical processing of the measured data will have little significance.
106 Citations
12 Claims

1. A method for processing data pertaining to an activity of partial electrical discharges taking place in a threephase electric machine (1) powered with square wave voltage, said data comprising a plurality of discharge signals associated with said partial electrical discharges and a plurality of sets of three values (e_{U}, e_{V}, e_{W}) of power supply voltage of the machine (1), each set measured in concurrence with a corresponding discharge signal,
characterised in that it comprises the following steps: 
transforming each set (e_{U}, e_{V}, e_{W}) of three voltage values measured into a corresponding pair (e_{d}, e_{q}) of voltage values; deriving a phase value from each of said pairs (e_{d}, e_{q}) of voltage values; attributing to each discharge signal associated with a corresponding partial electrical discharge the corresponding phase value, to assess the measured discharge signals as a function of corresponding phase values.  View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)


12. Method for assessing for diagnostic purposes an activity of partial electrical discharges taking place in a machine (1) powered with square wave voltage, comprising, for the measurement of the data to be processed, the following steps:

measurement of a plurality of discharge signals, associated with said partial electrical discharges; measuring a set of three values of voltage (e_{U}, e_{V}, e_{W}) powering the machine, in concurrence with each measured discharge signal, And comprising, with regard to the processing of said data, the following steps; transforming each set of three voltage values measured into a corresponding pair of voltage values (e_{d}, e_{q}); deriving a phase value from each of said pairs of voltage values; attributing to each discharge signal the corresponding phase value, to assess the measured discharge signals as a function of corresponding phase values.

1 Specification