Slot Partial Discharge

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IEEE Transactions on Dielectrics and Electrical Insulation>2010>17>5>1428 - 1440

Slot Partial Discharge Definition

  1. A Dual-Slot Barrier Sensor for Partial Discharge Detection in Gas-Insulated Equipment Abstract: This paper reports on the development and testing of a novel barrier sensor for UHF Partial Discharge (PD) detection in gas-insulated equipment. The sensor features a unique dual-slot planar antenna backed by an air-filled cavity.
  2. Partial Discharge Monitoring Iris Power Stator Slot Couplers (SSCs) are by far the most sensitive partial discharge sensor in the world since they are installed directly underneath the wedges in high voltage stator slots.

Abstract

Slot discharge refers to the observation that partial discharges (PD) may occur on the surface of the bar (half-coil), either within the stator core slot, or just outside of the slot. Figures 1-2 show photos of bars experiencing slot discharge considered as fairly serious and corrective action would be considered necessary. There are three.

To improve our understanding of slot partial discharge (PD) mechanisms, an accelerated aging test was initiated two years ago. This long-term experiment is being performed on six stator bars subjected to slot PDs under electrical, thermal and mechanical stresses. It is well known that slot PD activity in air-cooled generators is harmful to the stator winding ground insulation. The degradation induced by slot PDs will modify the physical properties of the surfaces of the cavity where PDs take place and this in turn will influence the slot PD process. To understand the evolution of slot PD activity and the changes in its PRPD (Phased Resolved Partial Discharge) pattern, it is therefore essential to recognize and understand the interdependence between surface modifications and PD signals. This paper presents results of visual observations of stator bar surface degradation, changes in surface conductivity and the effect on the evolution of PD signals in the presence of slot PD activity under conditions of electrical, thermal and mechanical stresses.

Identifiers

journal ISSN : 1070-9878
DOI 10.1109/TDEI.2010.5595544
Slot partial discharge symptoms

Authors

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Lévesque, M.

  • Ecole de Technol. Super., Montréal, QC, Canada

David, E.

  • Ecole de Technol. Super., Montréal, QC, Canada

Hudon, C.

  • Inst. de Rech. d'Hydro-Quebec IREQ, Varennes, QC, Canada

Bélec, M.

  • Inst. de Rech. d'Hydro-Quebec IREQ, Varennes, QC, Canada

Keywords

statorsageingelectric generatorslife testingmachine insulationmachine testingpartial dischargessurface conductivityslot partial discharge activityaccelerated aging teststator barsair-cooled generatorsstator winding ground insulationphased resolved partial dischargesurface modificationsstator bar surface degradationSurface treatmentBarsInsulationAgingDegradationSurface dischargessemi-conductive coating, temperature, vibration, conductivitySlot partial discharges, generator, stator bars, insulation

statorsageingelectric generatorslife testingmachine insulationmachine testingpartial dischargessurface conductivityslot partial discharge activityaccelerated aging teststator barsair-cooled generatorsstator winding ground insulationphased resolved partial dischargesurface modificationsstator bar surface degradationSurface treatmentBarsInsulationAgingDegradationSurface dischargessemi-conductive coating, temperature, vibration, conductivitySlot partial discharges, generator, stator bars, insulation

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Fields of science

Slot Partial Discharge Symptoms

Fields of science

Slot Partial Discharge Procedure

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