Title :
Determination of negative-sequence resistance of turbo-generators from rated-frequency standstill tests
Author :
Neidhoefer, G.J. ; Subbarao, V.S.
Author_Institution :
Brown, Boveri & Co. Ltd., Baden, Switzerland
fDate :
3/1/1988 12:00:00 AM
Abstract :
Systematic analysis and comparison of standstill and rotational test results for a large number of turbogenerators in the range of 30 to 1300 MVA and having various damper systems, shows that the ratio of negative-sequence resistance to mean subtransient resistance varies in a narrow range of ±10% around 0.85. This corresponds to an increase of about 1.5 to 1.85 times in the equivalent rotor resistance when the frequency is doubled, in contrast to the figure of √2 quoted in literature. Additional verification is obtained from frequency-response tests on one of the machines investigated
Keywords :
electric resistance measurement; machine testing; rotors; turbogenerators; 30 to 1300 MVA; damper systems; frequency-response tests; machine testing; negative-sequence resistance; rated-frequency standstill tests; rotational test; rotor resistance; subtransient resistance; turbogenerators; Bars; Frequency; Iron; Manufacturing; Performance evaluation; Stators; Synchronous machines; System testing; Tellurium; Voltage;
Journal_Title :
Energy Conversion, IEEE Transactions on
