Measurements of magnetic flux density in rotating machines : development of a calibrated and portable measurement system

2014

Masteroppgave i fornybar energi ENE 500 Universitetet i Agder 2014 Diagnostics of generator poles has traditionally been done by measuring the impedancein each pole and assume that the magnetic ux density is proportional to the impedance.With Hall-sensors it is possible to measure the actual magnetic ux density in each poledirectly. It is also possible to measure the ux density while the machine is runningwhich is not possible with impedance tests. In this project a complete system for makingmeasurements with Hall-sensors has been developed and tested on three generators. Twoof the generators were hydropower generators of 50 and 90 MVA. The measurementsystem is comprised of hall-sensors, po…