By Anempodistov, V. P.; Kasharskiĭ, Ėngmar Grigorʹevich; Urusov, Izmail Dzhankhotovich
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Extra info for Problems in the design and development of 750 MW turbo-generators
Example text
Separate machine-exciter s e t s have the following merits: 1. Large low-speed exciters with great mechanical and com mutation reliability can be produced. 2. Repairs and inspection can be carried out without stop ping the turbo-generator. 3. The exciter set can be accommodated in any convenient place inside or outside the engine room. Their main disadvantages are the undue complication of the overall system of excitation and the reduction in reliability owing to the special drive motor which is supplied from the station auxiliaries.
It is best to investigate l o s s e s in relation to leakage flux by physical models since very great difficulties arise in tests on an actual generator in operation. Figure 22 shows a photograph of a model which has been developed at the Electromechanics Institute for determining the variation in the l o s s in the teeth of an end packet with the flux density of the leakage field and the main field. In particular, tests have revealed that the eddy current circuit is non-linear and that the flux density of the main field in an end packet has a great effect on the extent of additional The new problems of design 37 l o s s e s (see Fig.
2) cold-rolled grain-oriented grade E330 steel with teeth across the direction of rolling; 3) the same, but with teeth along the direction of rolling; 4) the same, but with 1/3 of the s h e e t s with teeth along, and 2 / 3 of the sheets with teeth across, the direction of rolling. This Table indicates that versions 3 and 4 are little better than No. 2, but it should be pointed out that there is still a lack of test data regarding the use of cold-rolled grain-oriented steel, turbo-generator stray l o s s e s etc.