Classification of partial discharges for DC equipment

Hoogenraad, G.; Morshuis, P.H.F.; Petrarca, C.

doi:10.1109/ceidp.1996.564608

Cited by 15 publications

(4 citation statements)

References 5 publications

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“…Based on the basic interpretation tools for partial discharges at DC voltages proposed by Fromm [10][11] and later on by other researchers [e.g. [12][13][14][15][16], the mechanism, detection and classification of partial discharges under DC stress are more or less understood. Different ways of PD data representation have been proposed in [12][13].…”

Section: Voltagementioning

confidence: 99%

Experimental investigations on partial discharge characteristics of water droplets on polymeric insulating surfaces at AC, DC and combined AC-DC voltages

Nazemi

Hinrichsen

2015

IEEE Trans. Dielect. Electr. Insul.

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Water droplets on polymeric insulating surfaces provide an intensified E-field stress at the common interface between water droplet, insulating surface and surrounding air, which may lead to partial discharges, surface deterioration or even flashover. While intensive research has been performed for the AC case and also for the DC case, a new kind of stress may arise by the combination of both, which is present when a DC and an AC system are installed on the same tower. Water droplet deformations at AC, DC and combined AC-DC voltages as well as their PD characteristics are experimentally investigated and discussed in this contribution. The water droplet at AC voltage oscillates at different oscillation modes, while it elongates towards electrodes at DC voltage. The deformation under combined AC-DC voltage stress consists of an oscillation superimposed to an elongation towards the electrodes. The water droplet elongates towards the AC electrode when the polarity of DC source is negative, while it elongates towards the DC electrode in case of positive DC voltage. Oscillation modes of the water droplet at AC voltage have an influence on its PD inception E-field strength. Under DC stress the PD signals consist of two or more different PD levels which are due to the differently sharped edges of the deformed water droplet. Increasing the DC component at combined AC-DC voltage provides a lower PD inception E-field strength. Conductive water droplets have lower PD inception values in comparison with non-conductive ones under AC-DC stress.Index Terms -Water droplet, polymeric insulating surfaces, PD inception E-field strength and combined AC-DC voltage.

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Section: Voltagementioning

confidence: 99%

Experimental investigations on partial discharge characteristics of water droplets on polymeric insulating surfaces at AC, DC and combined AC-DC voltages

Nazemi

Hinrichsen

2015

IEEE Trans. Dielect. Electr. Insul.

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“…Past work has shown that PD measured online from HVDC equipment can be analyzed by using statistical distributions for the data collected [6]. Specifically for a fixed measurement interval, data for the pulse magnitude and the time between successive discharges is recorded.…”

Section: Partial Discharges In Hvdc Equipmentmentioning

confidence: 99%

“…The 500-kVdc bushings consist of two resin impregnated paper cores joined by a gas duct at the ground flange filled with a sulfur-hexafluoride (SF 6 ) and nitrogen mixture. The bushings are associated with a thyristor-controlled HVDC converter valve group at the rectifier end of the Nelson River Bipole 1.…”

Section: Introductionmentioning

confidence: 99%

Online partial discharge measurement of a high-voltage direct current converter wall-bushing

Jacob

McDermid

Kordi

2010

2010 International Conference on High Voltage Engineering and Application

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An online Partial Discharge (PD) measurement performed on a High Voltage Direct Current (HVDC) wall bushing successfully identified the presence of internal discharges. The wall bushing is a sulfur hexafluoride gasinsulated bushing, rated for 500kVdc and terminated on a thyristor controlled HVDC converter bridge. The measurement of PD within the HVDC station environment is particularly challenging due to the high levels of electromagnetic noise caused by thyristor switching events, and external air-corona from the neighboring high-voltage equipment. An additional challenge is the "mixed" voltage stress on the bushing insulation, which has both ac and dc high-voltage components. There are also fast transients during the firing of thyristors in the HVDC conversion process that cause added stress to the insulation. As a result, the analysis and interpretation of PD data for HVDC equipment is more complex; PD pulses may occur in response to the ac, dc, or switching transient voltage stresses. In this paper, an online PD measurement strategy for noise filtering and isolation of PD sources within the bushing are discussed. The PD measurement data is plotted on a phase-resolved diagram where the line cord voltage was used as a reference. The phase-resolved diagram appears to suggest that the fast transients caused during switching, trigger some PD events. The findings from the online PD measurements are verified with physical evidence, found after the bushing was removed from service.

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“…It had the phase information like <p under AC condition. So, based on the (q,~t), statistical analysis way of power ACPD signal can be used for DCPD signals [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

High sensitive DCPD measurement and analysis system of high-voltage storage capacitor

Ran

Zhou

et al. 2009

2009 IEEE 9th International Conference on the Properties and Applications of Dielectric Materials

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Partial discharge detection under DC is an appropriate method for insulation condition estimation. This paper presented a DCPD measurement and analysis system. System, characterized by high signal to noise ratio and strong ability for interference suppression, was composed with narrowband RLC balanced detection circuit, gain-stable amplifier and band-pass filter. Through trigger acquisition, DCPD signal was transferred to the computer and data were processed based on~t analysis method in order to reflect characteristic parameters of PD signal by spectrum and fingerprint. Through the calibration by standard pulse generator, sensitivity of whole system reached 2pC which is enough to detect PD current in storage capacitor. Based on this measurement and analysis system, measurement for high-voltage storage capacitor with typical defects would be conducted and the results effectively reflected relationship of PD parameters. Therefore, the establishment of this system settled a good basis for defect types recognition and aging degree estimation of capacitors.

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Classification of partial discharges for DC equipment

Cited by 15 publications

References 5 publications

Experimental investigations on partial discharge characteristics of water droplets on polymeric insulating surfaces at AC, DC and combined AC-DC voltages

Experimental investigations on partial discharge characteristics of water droplets on polymeric insulating surfaces at AC, DC and combined AC-DC voltages

Online partial discharge measurement of a high-voltage direct current converter wall-bushing

High sensitive DCPD measurement and analysis system of high-voltage storage capacitor

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