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The use of partial discharge (PD) online monitoring as an indicator of hydro-generator stator insulation condition, is well known. In this paper, a set of partial discharge online monitoring system for hydro generator (HPDMS) with the characteristics of high reliability is developed, and the de-noise method of the system is introduced, In succession, the influence of PD sensors installation on hydro-generator's...
High voltage rotating machines are supposed to be optimized not only in terms of performance but among others also with respect to space and material utilization. When designing machines there has been considerable effort made to reduce the overall size of generators particularly in the axial direction. The winding is one of the more demanding parts of the generator but the end winding is an obvious...
This paper will present recent findings of insulation damage in large, air-cooled generators. The primary damage mechanism is due to spark erosion, sometimes called vibration sparking, but evidence of partial discharge deterioration is also presented. Borescope inspection of the windings provides an indication of the degree of damage. Bars removed from these generators were also closely examined for...
Partial discharge (PD) is one of the most promising phenomena to utilize in detecting deterioration of high voltage rotating machine insulation. PD test can be performed either when the machine is not operating (off-line) or during normal machine operation (on-line). Off-line PD test is a well-known method to assess the stator winding insulation and on-line PD test has proven to be a successful technique...
Partial discharge (PD) testing has been used for over 50 years to detect insulation problems in motor and generator stator windings. By periodically measuring the on-line PD activity, usually at least two years warning is given before the risk of stator winding failure is high - which is sufficient time to plan corrective maintenance or a rewind. Such testing is now routinely applied to more than...
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