Order Publications

Reference: ISH2015_558

ISH Collection

Acoustic location of transformer PD under non-ideal conditions



Partial discharge activity in large power transformers being detected during acceptance testing, or with on-site testing triggered by alarming DGA results, must be located as precise as possible to start corrective actions. Here, acoustic location of the activity is a valuable tool and sources offering a direct oil path to the accessible tank wall are usually an easy find at high precision. However, often the location is deeper buried in the winding and, hence, acoustic transmission is hampered by attenuation, reflection, dispersion, and transmission following oil channels, spacer gaps, and other paths. Thus, "textbook solutions", such as solving the sphere functions produce misleading results and understanding the limitations as well as the remaining possibilities of acoustic location is essential. Additionally, adequate handling of acoustic noise sources helps to improve the sensitivity. Moreover, the use of an electrical trigger signal in combination with advanced trigger logic helps to improve detection, separation, and location.

File Size: 260,4 KB

Year: 2015

FREE free
Non member
FREE free

Your AccountYour Account

Password forgotten


may download free of charge all publications including most recent ones

Non Members

may download free of charge publications over three years old and purchase all publications

For any questions in connection with the on-line library, contact:

Publications and Editions Manager