Diagnostic Measurements for Power Transformers

Energies

Mohammad Djamali¹  Sebastian Coenen²  Martin Siegel³  Andreas Müller³  Stefan Tenbohlen³  Mohammad Hamed Samimi⁴ 

[1] Moenchengladbach 41065, Germany;General Electric Grid Solutions;Institute of Power Transmission and High Voltage Technology, University of StutFtgart, Stuttgart 70569, Germany;TÜV Süd Energietechnik, Filderstadt 70794, Germany;

关键词: power transformer;    condition assessment;    reliability;    failure statistic;    partial discharge measurement;    frequency response analysis (FRA);    dissolved gas analysis (DGA);    dielectric response measurement;    moisture in oil;    dynamic thermal modeling;   

DOI  :  10.3390/en9050347

来源: DOAJ

【 摘 要 】

With the increasing age of the primary equipment of the electrical grids there exists also an increasing need to know its internal condition. For this purpose, off- and online diagnostic methods and systems for power transformers have been developed in recent years. Online monitoring is used continuously during operation and offers possibilities to record the relevant stresses which can affect the lifetime. The evaluation of these data offers the possibility of detecting oncoming faults early. In comparison to this, offline methods require disconnecting the transformer from the electrical grid and are used during planned inspections or when the transformer is already failure suspicious. This contribution presents the status and current trends of different diagnostic techniques of power transformers. It provides significant tutorial elements, backed up by case studies, results and some analysis. The broadness and improvements of the presented diagnostic techniques show that the power transformer is not anymore a black box that does not allow a view into its internal condition. Reliable and accurate condition assessment is possible leading to more efficient maintenance strategies.

【 授权许可】

Unknown