TY - GEN

T1 - Comparison of Acoustical Partial Discharge Signals under AC and DC Stress

AU - Najafi, S. A.M.

AU - Saadati, Hassan

AU - Werle, Peter

PY - 2016/8/22

Y1 - 2016/8/22

N2 - It is well known that partial discharges (PD) can generate chemical, acoustical, electrical and UHF signals. Acoustical detection methods have an advantage of immunity to electromagnetic noises, which makes their use very common for PD localization. Some new investigations showed that not all of the PDs during AC stresses could generate acoustic emission (AE) signals and were therefore called silent PDs [2]. Investigations under AC stresses have been done to find the effect of different configurations and situations on silent PDs, but still the exact reason of creation this kind of PDs is not clear. Therefore in this paper, investigations on the effect of DC stresses on this kind of PDs will be described, in order to better understand and explain their nature and to determine some characteristics of silent PDs. Special configurations under AC stress have been applied to create silent PDs inside an oil tank. After that, positive and negative DC voltages have been applied to investigate this phenomenon under different DC stresses. AE signals have been recorded by an oscilloscope and electrical PD signals via a standard PD measurement device. The results show different discharges at AC and DC stresses, thus the probable reason of this fact is discussed in details in the contribution.

AB - It is well known that partial discharges (PD) can generate chemical, acoustical, electrical and UHF signals. Acoustical detection methods have an advantage of immunity to electromagnetic noises, which makes their use very common for PD localization. Some new investigations showed that not all of the PDs during AC stresses could generate acoustic emission (AE) signals and were therefore called silent PDs [2]. Investigations under AC stresses have been done to find the effect of different configurations and situations on silent PDs, but still the exact reason of creation this kind of PDs is not clear. Therefore in this paper, investigations on the effect of DC stresses on this kind of PDs will be described, in order to better understand and explain their nature and to determine some characteristics of silent PDs. Special configurations under AC stress have been applied to create silent PDs inside an oil tank. After that, positive and negative DC voltages have been applied to investigate this phenomenon under different DC stresses. AE signals have been recorded by an oscilloscope and electrical PD signals via a standard PD measurement device. The results show different discharges at AC and DC stresses, thus the probable reason of this fact is discussed in details in the contribution.

KW - AC Voltage

KW - DC Voltage

KW - Partial Discharge

KW - Silent PD

KW - Silent discharge

KW - acoustic emision

KW - emission

UR - http://www.scopus.com/inward/record.url?scp=84988431085&partnerID=8YFLogxK

U2 - 10.1109/EIC.2016.7548652

DO - 10.1109/EIC.2016.7548652

M3 - Conference contribution

SN - 978-1-4673-8707-1

SP - 523

EP - 526

BT - Conference Proceedings 34th Electrical Insulation Conference, EIC 2016

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 34th Electrical Insulation Conference, EIC 2016

Y2 - 19 June 2016 through 22 June 2016

ER -