Combined solid-state and mechanically-switched transformer tap-c

Electricity: power supply or regulation systems – Output level responsive – Using a transformer or inductor as the final control device

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

323343, G05F 116

Patent

active

054081718

ABSTRACT:
Disclosed is an End-Turn Solid-State Switching (ETSS) transfomer tap which makes use of a high-speed solid-state switching network to select either the end-turn lead or one of a number of non-isolated taps on a transformer regulating winding, and connects the selected tap to, while disconnecting the previously selected tap from, a single output conductor carrying the transformer load current. ETSS effectively changes the reference to one of the possible taps interfaced to a solid-state switching network. The same transformer regulating winding connected to ETSS can also be connected in series with a slow-speed mechanically-switched tap-changer (LTC). ETSS selects one connection point on the regulating winding while LTC operation selects the second point. A difference voltage is produced, depending on the number of turns between the ETSS selected tap and the LTC selected tap. The sign of the difference in voltage depends on whether the ETSS selected tap is higher or lower than the LTC selected tap. The difference or tap selected voltage is in series with the transformer load current. In one embodiment, the high-speed solid-state switching network uses a "Staggered Progression of Solid-State Switches" (SPSS) to select one of a number of non-isolated taps on a transformer regulating winding and connect the selected tap in series with the load circuit. A switching network arranged according to the method SPSS reduces the necessary total switch power rating, and steady-state losses. ETSS can accomplish modulation of the tap-selected voltage about the nominal value established by the LTC.

REFERENCES:
patent: 3579092 (1971-05-01), Matzl
patent: 3729673 (1973-04-01), Schneider
patent: 3743921 (1973-07-01), Legg et al.
patent: 3944913 (1976-03-01), Kugler
patent: 4102298 (1978-07-01), Dietze et al.
patent: 4550285 (1985-10-01), Kugler et al.
patent: 4571499 (1986-02-01), Wein
patent: 4622513 (1986-11-01), Stich
patent: 4829229 (1989-05-01), Johannsson et al.
patent: 4860145 (1989-08-01), Klingbiel
patent: 5006784 (1991-04-01), Sonntagbauer
patent: 5166597 (1992-11-01), Larsen et al.
Feinberg, R. "Modern Power Transformer Practice", 1979, John Wiley & Sons.
EPRI Report EL-6943, "Flexible AC Transmission Systems (FACTS): Scoping Study", Sep. 1991.
EPRI Report EL-6079, "Study of Improved Load-Tap-Changing for Transformers and Regulators", Nov. 1988.

LandOfFree

Say what you really think

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

Rating

Combined solid-state and mechanically-switched transformer tap-c does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Combined solid-state and mechanically-switched transformer tap-c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Combined solid-state and mechanically-switched transformer tap-c will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-68723

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