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A data acquisition system for partial discharges (PD) is being developed, which can simultaneously measure the phase 'V and apparent charge magnitude 'q' of PDs occurring on a given power line voltage and display the number '0' distribution of PDs n(q,@) on a three dimensional plot. The two-channels (one for the PD signal and one for the reduced power line voltage) data acquisition can sample at a rate of 2OMSampledsec (MSdsec) and store up to 8Mega bytes of data per channel, which represents 20 power line cycles (PLC) at 50Hz. This system bas been tested using simulated PD pulses, of constant q and random @ and vice versa. The results show good agreement between the range of @ and q in the simulated input PDs and the resulting n(q,@) plots. The analysis part of the system has been fuaher tested using experimental PD data obtained from an RLC detection circuit and the corresponding PLC both taken at a sampling rate of 1.2MSdsec. Good agreement is obtained between the apparent ranges of q and @on the raw input data and the resulting n(q,@) plot.

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A 2channel data acquisition and processing system (DAPS) for partial discharges (PD) using a fast (ZOMSdsec) digitizer (National Instruments 5102) has been developed which can acquire up to 16 million samples per channel (This represents 48 power l i e cycles (PES) at 6OHz), and simultaneously measure the phase 'V and 'q' of PDs occurring on a given power Line voltage and represent on a 3D plot of n(q,@). This system has been tested, using artificially generated PD pulses at constant/variable 'q' and constant/variable '6' and experimental data. Good agreement is obtained between the ranges of 'V and '9' in the artificially generated PDs, the raw input data and the resulting n(q,$) plots, which is the number of PDs occuring in a given q and cp window in a given period. The acquisition and processing programs developed in JahVIEW are optimized to handle 32 million (16 milliodchannel) samples of data. The resolution of this DAPS system is 5OmV in voltage and 1" in.phase, and is limited by the voltage resolution of the digitizer, and the resolution in delay timing of the anifcial PD generation system.