Fail-safe circuit for tap-changing transformer regulating...

Details Fail-safe circuit for tap-changing transformer regulating... Fail-safe circuit for tap-changing transformer regulating...

G - Physics

05

F

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G05F 3/06 (2006.01) G01R 31/00 (2006.01) G05F 1/147 (2006.01) H01F 27/40 (2006.01) H01F 29/02 (2006.01) H02H 7/055 (2006.01)

Patent

CA 1090419

FAIL-SAFE CIRCUIT FOR TAP-CHANGING TRANSFORMER REGULATING SYSTEM ABSTRACT OF THE DISCLOSURE 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.

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