Torque measurements in synchronous generators using giant magnetoresistive sensor arrays via the Maxwell stress tensor
Authors:
- 1 January 2013
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- No. 19325517,p. 1-5
Abstract
Power system oscillations arise from various sources. One contributor that is difficult to quantify during operation is the induced (air-gap) torque. This paper presents a new approach for measuring the instantaneous air-gap torque in real-time for synchronous generators. This is achieved through recent progress in nanowire giant magnetoresistive sensor (GMR) technology that now makes it possible to directly measure magnetic fields in the air-gap of operating electrical machinery. Results show that it is possible to compute the instantaneous air-gap induced electrical torque by evaluating a discretized form of the Maxwell stress tensor. This torque measurement can then be used to extract information on the operating condition of a synchronous generator in real-time. A prototype GMR sensor is evaluated. Analysis for generator diagnostics and detection of torsional oscillations is presented.Keywords
This publication has 17 references indexed in Scilit:
- Finite Element Analysis of Turbine Generator Rotor Winding Shorted TurnsIEEE Transactions on Energy Conversion, 2012
- Using magnetic flux monitoring to detect synchronous machine rotor winding shorts2012
- Overview of subsynchronous resonance related phenomena2012
- Detection of inter-coil short circuits in synchronous machine armature winding on the basis of analysis of machine magnetic field2010
- Determination of instantaneous torque from airgap flux measurements in a switched reluctance motor2010
- Application of STATCOM for Reducing Stresses due to Torsional Oscillations in Turbine-Generator Shaft2007
- Controlled growth of CoCu nanowires and application to multilayered CoCu/Cu nanowires with selected anisotropyJournal of Physics D: Applied Physics, 2006
- Broken damper bar detection studies using flux probe measurements and time-stepping finite element analysis for salient-pole synchronous machines2003
- Design, fabrication, and wafer level testing of (NiFe/Cu)/sub xn/ dual stripe GMR sensorsIEEE Transactions on Magnetics, 1997
- Development and Testing of an Automatic Stability Prediction and Control (ASPAC) for a Synchronous Generator by Air Gap FluxIEEE Power Engineering Review, 1982