Protection method and protection device for detecting...

H - Electricity – 02 – P

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

318/67

H02P 9/08 (2006.01) H02H 7/06 (2006.01)

Patent

CA 1299639

88/099 ABSTRACT OF THE DISCLOSURE Protection method and protection device for detecting asynchronism during the synchronous starting of a syn- chronous machine. During the run-up of high-power synchronous machines (6), such as those used in pumped storage plants, in gas turb- ines sets and so forth, unwanted alternating currents with slip frequencies between those of the phase swings and the nominal frequency (50 Hz) of the synchronous machine (6) can also occur in the disturbed condition in addition to low-frequency plant-specific phase swings. These alternating currents are induced in the field windings of the synchronous machine (6) as a consequence of an unwanted asynchronous starting and can lead to inadmissible heating of the synchronous machine and to overvoltages in the field circuit. Alternating voltages (U1) associated with the slip frequencies are detected from use of a sensing resistor (4) in the exciter current (if) of the synchronous machine (6), separated from the high-voltage potential in an isolating converter (10), subsequently filtered in a bandpass filter (11), con- trolled for constant amplitude in a function generator (12), triggered in a Schmitt trigger (13) and selected by means of two timing sections (15, 16). If a slip fre- quency is detected uninterrupted for longer than a predeterminable minimum period (T3), field and high- voltage switches (5, 7) in the circuits of the synchro- nous machine (6) are opened by a RS flip-flop (19). (Fig. 1)

611279

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Protection method and protection device for detecting... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Protection method and protection device for detecting..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Protection method and protection device for detecting... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1214349

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.