Articoli correlati a Design of alternating current apparatus ; Electric...
Design of alternating current apparatus ; Electric transmission Line construction Switchboards and switchboard appliances Power transformation and measurement - Brossura
Sinossi
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 Excerpt: ...and is wound with coils F, F that are connected in series and joined to the secondary of the potential transformer whose primary is connected to the bus-bars. The armature core B is of the drum type, and is wound with two coils C and D that are approximately at right angles to each other. These coils are connected in series, and their junction x is connected to the middle ring 2 of three collector rings mounted on the shaft. The other two terminals are connected to rings 1 and 3. The middle ring, through its brush, connects directly to one terminal of the potential transformer of the machine to be synchronized. Ring 3 connects to a choke coil or inductance L; ring 1 connects to one terminal of a noninductive resistance R. The remaining terminals of R and L are joined to y and connect to the other terminal of the potential transformer. The inductance L and resistance R are adjusted so that the currents in the coils C and D differ in phase by very nearly 90. The current in the coils F, F will lag nearly 90 behind the E. M. F. E, because of the high inductance of the field coils; consequently, the magnetism set up by the field will be 90 behind the E. M. F.E. When the current in coil D is in phase with the field magnetism, D will swing around until it assumes the vertical position where its plane is at right angles to that of the field. The current in D is 90 behind E', because of the inductance L; hence, at synchronism the current in D is in phase with the field magnetism, and the pointer assumes the vertical position. The current Transformer Fig. 26 in C is in phase with E', and hence differs in phase from the field current by 90; hence, at synchronism no torque is exerted on coil C if the frequencies of E and E' are equal. But if E and E' differ in phase by...
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