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|Title: ||UHF Sensors for Partial Discharge Diagnostics of Power Transformers|
|Authors: ||Meijer, S.|
D. Agoris, P.
J. Smit, J.
F. Reijnders, H.
|Issue Date: ||17-Jun-2007|
|Publisher: ||Proceedings of the International Conference on Electrical Engineering and Informatics|
|Series/Report no.: ||F-03;|
|Abstract: ||Different diagnostic techniques are currently available for on-line insulation condition assessment of power transformers.
Amongst these techniques, the UHF technique has been recently presented in the field of transformer diagnostics. This paper
describes results from experimental investigations which have been carried out to study the partial discharge phenomena in power
transformer insulation. The UHF technique has been applied to and investigated on two new identical 90 MVA, 150 kV power
transformers. Both transformers are equipped with four external UHF sensors. Installation of external UHF sensors requires
dielectric windows on the transformer tank for the placement of the sensors. On older transformers that have a higher risk of failure
these windows might be added by replacing manhole covers, but that would require draining the oil. Therefore, a sensor which can
be inserted in a transformer from one of its valves, without draining the oil, is studied as well. Both UHF sensor-techniques were
compared during an induced voltage test on a 75 MVA, 50 kV shunt reactor. The practical experiences related in this paper provide
further insight into the application of UHF PD monitoring techniques to power transformers.|
|Appears in Collections:||E-Journal Teknologi Industri|
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