Experimental Challenges when Measuring Partial Discharges under Combined DC and High Frequency AC Voltage

Pål Keim Olsen,Ingrid Roen Velo,Frank Mauseth

doi:10.5324/nordis.v0i24.2290

Pål Keim Olsen, Ingrid Roen Velo + Show 1 more

Open Access

https://doi.org/10.5324/nordis.v0i24.2290

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Abstract

The present paper reviews some of the challenges involved in designing and building an experimental setup for measurement of partial discharge under combined AC and DC voltage. A design of a modular test cell is discussed, as well as all parameters relevant to proper control of the experiment conditions. The described experimental setup is capable of producing sinusoidal AC voltage at a variable frequency up to 5 kHz superimposed a high DC voltage. The challenges related to intermittent noise reduction was remedied by placing the setup in a Faraday cage and controlling the setup from the outside by optical cables. All equipment in the test setup was connected to the power grid through low-pass filters.

Highlights

The use of HVDC transmission systems have been steadily increasing since the first installation of the subsea link between mainland Sweden and the island of Gotland in 1954
Good experimental practice is paramount to push the research within this field further, the present paper will focus on the experimental challenges when designing and building a setup to measure partial discharges (PD) under combined HVDC and high frequency AC voltage
R = 1 mm Measurement shown in Fig. 4, 10 kVDC applied at 60 oC, AC voltage ramped up at 10 V/s after 8 hours, when the discharge repetition rate had stabilized

Summary

Introduction

The use of HVDC transmission systems have been steadily increasing since the first installation of the subsea link between mainland Sweden and the island of Gotland in 1954. HVDC transmission has found its niche in three main areas: extremely long distance transmission, connection between unsynchronized AC power systems and underwater transmission. As AC to DC conversion will result in a high frequency ripple voltage on the DC voltage, it will affect the partial discharge activity in HVDC insulation [1]. Good experimental practice is paramount to push the research within this field further, the present paper will focus on the experimental challenges when designing and building a setup to measure partial discharges (PD) under combined HVDC and high frequency AC voltage

Methods

Results

Discussion

Conclusion