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On-line partial discharge (PD) monitoring has become the most widely applied method to determine the condition of the electrical insulation in stator windings. Presently over 12,000 large motors and generators around the world are equipped with the required sensors.
In today's energy market, operators want to minimize the costs for maintenance and outages. Condition-based maintenance techniques using diagnostics and or monitoring systems are a prequisit in power grids nowadays. At times where the need for such systems is increasing, the time and knowledge available for analysis and interpretation is decreasing. Therefore, STRI, LDIC, VB Kraft and VB Elnat have...
The Oil/Gas industry is facing two major problems with its aging electric power generators. First, the Oil/Gas industry experience long outages of these power generation units for re-winding, during a time when power is extremely needed. Second, these fixed-interval scheduled maintenance practices are very costly as on average they cost around US$1 million per machine. To address these problems, we...
As mechanical vibration usually exists in HV motors and generators, its influence on the partial discharge (PD) needs to be studied so as to improve the reliability of on-line PD monitoring method. In this report, the mechanical vibration frequency was synchronized to the power frequency and the effects of vibration phase were investigated. Because the length of the discharge gap changed with the...
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