Case Study

Il case study dimostra come la misura di scariche cialisfrance24.com parziali permetta di individuare problemi nel sistema di isolamento degli avvolgimenti di statore di una macchina rotante; nel caso presentato il problema si presentava di particolare gravità, soprattutto perché individuato su avvolgimenti nuovi.

Oggetto: Misura scariche parziali off line su generatore sincrono.

Company: Confidential

Ratings: 6.5 MVA, 10.5 kV, Air Cooled Turbine Generator

Manufacturer: Confidential

Related Info: Manufactured in 1996, complete rewinding in 2009.

PD Sensors: IEC60270 quadrupole

“Anomalous PD activity for new windings detected – Machine failed within 6 months”

The generator was subjected to off line partial discharges measurements after a complete rewinding in November 2009. The measurements revealed an intense PD activity associated to an anomalous amplitude of PD signal for new windings. The shape of the patterns suggested the presence of delaminations and other effects of a bad impregnation. The owner was warned about the danger but the generator was placed back in service. After six months of operation the generator failed because of stator insulation breakdown.

 

Case study
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PD pattern

 


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