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On-line partial discharge (PD) measuring has become a powerful tool for condition assessment of insulation system of large rotating machines. Monitoring the trend in PD over time is usually used for interpretation of data but since the PD activity could be affected by operational and environmental factors it is strongly recommended that the periodic PD tests should be performed in the same conditions...
Operational and environmental conditions can affect the dielectric response of the insulation system of large rotating machines. Humidity is one of the well-known environmental parameters which could affect dielectric parameters such as insulation resistance, polarization index and dissipation factor up to a certain degree. It also could affect partial discharges occurring in rotating electrical machines...
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