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. 2018 Feb 6;18(2):482.
doi: 10.3390/s18020482.

Low-Pass Filter for HV Partial Discharge Testing

Vladimir Kindl  1 , Bohumil Skala  2 , Roman Pechanek  3 , Vaclav Kus  4 , Jaroslav Hornak  5
Affiliations

Low-Pass Filter for HV Partial Discharge Testing

Vladimir Kindl et al. Sensors (Basel). .

Abstract

The most common cause of high voltage electric machine malfunction is an electrical failure of the insulation system due to extreme partial discharges activity. The paper discusses the methodology for the construction of a low-pass high voltage filter for partial discharge measurement. It focuses mainly on the shape optimization, using an analytical approach with subsequent verification using the finite element method. The experimental verification is given together with important conclusions.

Keywords: design; finite element method; low-pass filter; magnetic field; partial discharge.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Basic partial discharges (PD) measurement test circuit [17].
Figure 2
Figure 2
Calibrating signal measured in the testing circuit (Figure 1) supplied by a 30-m-long shielded cable.
Figure 3
Figure 3
Basic design outline of the filter.
Figure 4
Figure 4
Finite element analyses (FEA) made under selected designs: magnetic flux density (left); magnetic flux density including current density in the winding (right).
Figure 5
Figure 5
Steady-state temperature distribution in the winding estimated for the full-load operation.
Figure 6
Figure 6
Detailed model of the filter considering the real geometry of the winding.
Figure 7
Figure 7
Model boundary condition settings (left); temperature distribution in the coil cross-section (right).
Figure 8
Figure 8
Equivalent electrical circuit for a coil.
Figure 9
Figure 9
Winding with no transposition (red) and transposed winding (blue) reducing the stray capacitance (left-side figure); winding divided into sections (right-side figure).
Figure 10
Figure 10
Axisymmetric FE model (left); calculated voltage distribution (right) across the model.
Figure 11
Figure 11
Equivalent model (node-to-node lumped capacitance network) for the first five turns of the winding (left); complete capacitance matrix expressed as a 3D plot (right).
Figure 12
Figure 12
Temperature rise in the filter under full load operation (left); temperature difference (right).
Figure 13
Figure 13
Frequency-dependent net impedance of the filter (left) and the phase shift measured between the supplying voltage and the input current (right).
Figure 14
Figure 14
Experimental arrangement with a microscopic snapshot of the tip shape.
Figure 15
Figure 15
Oscillogram for 7 kV, needle-plane arrangement.
Figure 16
Figure 16
Pattern diagram for 7 kV, needle-plane arrangement.
Figure 17
Figure 17
PD signal without filter (left); PD signal with filter (right).
Figure 18
Figure 18
FFT of PD signal without filter (left); FFT of PD signal with filter (right).
See this image and copyright information in PMC

References

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