A1-104 CIGRE 2012 Calculation of Electromagnetic Force on ...
A1-104 CIGRE 2012 Calculation of Electromagnetic Force on ...
A1-104 CIGRE 2012 Calculation of Electromagnetic Force on ...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
)Eddy current in damping windingsFig.3 The magnetic field and eddy current in damping windingunder rated load operati<strong>on</strong>Based <strong>on</strong> the numerical calculati<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> electromagnetic field and according to formula (2) to (4), theelectromagnetic force distributi<strong>on</strong> acting <strong>on</strong> damping windings was shown in Fig.4 when the generator was in the state<str<strong>on</strong>g>of</str<strong>on</strong>g> rated load operati<strong>on</strong>. Fig.4a) showed the electromagnetic force values <str<strong>on</strong>g>of</str<strong>on</strong>g> nine damping windings under the rated loadoperati<strong>on</strong>. Fig.4 b) showed the electromagnetic force status <str<strong>on</strong>g>of</str<strong>on</strong>g> the No.1 damping winding as the time changed in acycle.<str<strong>on</strong>g>Electromagnetic</str<strong>on</strong>g> force(N)100500-50-100FrFt-1500 2 4 6 8 10Damping winding numbera) <str<strong>on</strong>g>Electromagnetic</str<strong>on</strong>g> force values <str<strong>on</strong>g>of</str<strong>on</strong>g> all damping windings<str<strong>on</strong>g>Electromagnetic</str<strong>on</strong>g> force(N)150100500-50-100 FrFt-1500 5 10 15 20Time(ms)b) The electromagnetic force <str<strong>on</strong>g>of</str<strong>on</strong>g> the No.1 damping windingas time changesFig.4 The electromagnetic force distributi<strong>on</strong> acting <strong>on</strong> damping windings under rated running operati<strong>on</strong>From Fig.4 a), it could be seen that al<strong>on</strong>g the rotor rotati<strong>on</strong> directi<strong>on</strong> the electromagnetic force <str<strong>on</strong>g>of</str<strong>on</strong>g> the first dampingwinding (1 # damping winding) was significantly greater than the rest <str<strong>on</strong>g>of</str<strong>on</strong>g> the damping windings. Meanwhile, thetangential magnetic force <str<strong>on</strong>g>of</str<strong>on</strong>g> the No.1 damping winding was greater than the radial electromagnetic force <str<strong>on</strong>g>of</str<strong>on</strong>g> that. FromFig.4 b), it indicated that the electromagnetic force <str<strong>on</strong>g>of</str<strong>on</strong>g> the No.1 damping winding which suffered the largest forcewould fluctuate in a time period, because <str<strong>on</strong>g>of</str<strong>on</strong>g> the harm<strong>on</strong>ic current in damping winding.B. The Negative Sequence Operati<strong>on</strong> C<strong>on</strong>diti<strong>on</strong>The hydro-generator which can withstand the most severe c<strong>on</strong>diti<strong>on</strong>s <str<strong>on</strong>g>of</str<strong>on</strong>g> negative sequence is 12% negativesequence in China's regulati<strong>on</strong>. So this paper mainly studied the 12% negative chr<strong>on</strong>ological asymmetric operating
Change language