Title: Fail-safe circuit for tap-changing transformer regulating system

Abstract: A tap-changing transformer system, utilized for voltage regulation of the line potential applied to a load from a source of energy, has a non-arcing switch to protect tap contacts during a tap change. A fail-safe circuit is utilized to determine that the non-arcing switch and its associated circuitry are operating properly before a movable tap contact is transferred from one stationary tap to another. In the event that the fail-safe circuit detects an improper operation of the non-arcing switch, the source is connected directly to the load to preclude the passage of any load current through the tap-changing transformer. A particular form of transfer switch useful in effecting the connection of the source directly to the load employs a current-limiting impedance arrangement.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Gilker, Clyde (South Milwaukee, WI, US)
Lamke, Arland D. (Franklin, WI, US)

Application Number: 761011
Filing Date: 1977-01-21
Publication_date: 1978-05-16
Assignee: McGraw-Edison Company (Elgin, IL)
Primary Class(es): 361/3 361/5
Other Classes:
US Patent Ref:

3436646	Apr, 1969	Prescott	323/43.
3515980	Jun, 1970	Throop	323/43.
3602807	Aug, 1971	Prescott	323/43.

Other Refs:
Primary Examiner: Salce, Patrick R.
Assistant Examiner:
Attorney: Gealow; Jon Carl, LaPorte; Ronald J., McDonald; Thomas E.