NDLI: Ultrasonic dynamic air-gap monitoring system for large hydro-generators

Content Provider	IEEE Xplore Digital Library
Author	Adamowski, J.C. Souza, A.T. Perez, N. Lima, A.A. Oda, P.D. Tiba, H.H.
Copyright Year	2013
Description	Author affiliation: Dept. of Mechatron. & Mech. Syst. Eng., Univ. of Sao Paulo, São Paulo, Brazil (Adamowski, J.C.; Souza, A.T.) \|\| Paysandu Univ. Center, Univ. of the Republic, Paysandú, Uruguay (Perez, N.) \|\| Companhia Energetica de Sao Paulo - CESP, São Paulo, Brazil (Lima, A.A.; Oda, P.D.; Tiba, H.H.)
Abstract	The dynamic air-gap monitoring of hydro-generators consists of the distance measurement between rotor poles and stator while it is in operation. This work presents a new approach for the air-gap measurement performed by measuring the time of flight of an ultrasonic wave traveling between the stator and the rotor. The measuring system consists of two pairs of small-size rectangular (4.5 × 8.0 mm) piezocomposite ultrasonic transducers (420 kHz), operating in pitch-catch scheme, which were designed for allowing their installation in ventilation ducts from outside the hydro-generator stator. The sound velocity is corrected based on the measurement of air temperature close to the ultrasonic transducer. The effect of the air flow velocity in the region of the air gap is compensated by calculating the average of the time of flight in the air flow direction and in the opposite direction to the flow. The ultrasonic air-gap monitoring sensor was installed in the hydro-generator number 5 (UG05 - 170MW) of the hydroelectric power plant of CESP Ilha Solteira (Brazil). The air-gap sensor was tested on several conditions of machine operation showing a repeatability of 0.1-mm in the dynamic measurement of the air-gap.
Sponsorship	IEEE Ultrason., Ferroelectr., Freq. Control Society
Starting Page	1311
Ending Page	1314
File Size	845137
Page Count	4
File Format	PDF
ISSN	19485719
e-ISBN	9781467356862
DOI	10.1109/ULTSYM.2013.0335
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-07-21
Publisher Place	Czech Republic
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Air gaps Ultrasonic variables measurement Rotors Temperature measurement Stators Generators Transducers air ultrasound air-gap monitoring piezocomposite
Content Type	Text
Resource Type	Article

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