Abstract
When digitally acquiring partial discharge (PD) signals, the bandwidth, the parameters of the measuring circuit and the arrangement of the test set-up play a role in preventing the signals from being affected by oscillations, distortions and noise. In this paper, a compact design of test set-up for PD measurements and a method for characterization of the frequency response of the measuring circuit is proposed. The frequency characterization was based on the induction of a fast current pulse in the closed HV loop of the measuring circuit. Frequency domain analysis and the use of a RLC model led to a practical estimation of the circuit inductance L. Experimental results showed that the resonance produced by the circuit inductance and the combined capacitance of the test object and the coupling capacitor C can produce resonance peaks within the bandwidth of the measuring PD sensor, which results in large oscillations. In addition, it was shown that adding a critical resistance Rc damps the oscillations, thus reducing the error in parameter computation.
Original language | English |
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Article number | 8424393 |
Pages (from-to) | 1535-1544 |
Number of pages | 10 |
Journal | IEEE Transactions on Dielectrics and Electrical Insulation |
Volume | 25 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2018 |
Keywords
- calibration
- damping
- frequency response
- oscillation
- partial discharge
- resonance