Abstract
This paper reports on the design and testing of a new UHF transformer probe sensor which is robust in terms of its mechanical design as well as possessing high electrical sensitivity. Mechanical design and practical safety considerations relating to on-site installation are addressed. The frequency response of the probe has been compared to that of a commercially available sensor. Sensor response has been fully characterised in terms of sensitivity with respect to mounting depth relative to the transformer tank wall. This was achieved using a pulsed GTEM transient calibration cell with a specially designed transformer valve mounting plate. The new UHF probe sensor was found to achieve the minimum recommended sensitivity of 2 mm mean effective height at 0 mm insertion relative to the tank wall. The reference probe achieves the same sensitivity at a depth of 27 mm. This significant improvement in sensitivity should increase the signal-to-noise ratio of any recorded data and improve the detection rate of any incipient failures.
Original language | English |
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Title of host publication | 2009 44th International Universities Power Engineering Conference (UPEC) |
Publisher | IEEE |
Number of pages | 4 |
ISBN (Electronic) | 978-0-947649-44-9 |
ISBN (Print) | 978-1-4244-6823-2 |
Publication status | Published - Sep 2009 |
Keywords
- probes
- partial discharge measurement
- mechanical sensors
- sensor phenomena and characterization
- testing
- robustness
- safety
- frequency response
- pulse transformers
- calibration