Title :
Sensitive online PD-measurements of onsite oil/paper-insulated devices by means of optimized acoustic emission techniques (AET)
Author :
Grossmann, Ekard ; Feser, Kurt
Author_Institution :
Inst. of Energy Transmission & High Voltage Technol., Stuttgart, Germany
Abstract :
Recently developed monitoring-systems show the need as also the possibilities for online- and offline-onsite-diagnostics. The limit in sensitivity for electrical pd-measurements according to IEC 60270 which is reached using filters for sinusoidal disturbances and compensation for corona impulses is still not satisfactory. The acoustic partial discharge measurement (pd-measurement) is also a well known and reliable method often used by transformer manufacturers in testing. In laboratory setups a gain in sensitivity of the acoustic in comparison to the electrical pd measurements could be established. This is reached by adapting the sensors to the propagation path, a modern but moderately priced acquisition hardware and the introduction of new signal processing algorithms. The developed sophisticated measuring systems show remarkable results in online acoustic pd-measurements onsite.
Keywords :
acoustic signal processing; insulating oils; optimisation; paper; partial discharge measurement; power engineering computing; power system measurement; power transformer insulation; IEC 60270; PD measurement; acoustic emission technique optimization; acoustic partial discharge measurement; corona impulse; electrical pd measurement; monitoring system; offline-onsite diagnostic; onsite oil insulated device; paper insulated device; signal processing algorithm; transformer manufacturer; Acoustic emission; Acoustic measurements; Corona; Filters; IEC standards; Lubricating oils; Monitoring; Oil insulation; Partial discharge measurement; Petroleum; Acoustic measurements; partial discharges; signal processing; transformers;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2004.835288