Fail-safe circuit for tap-changing transformer regulating system

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

1977-01-21

1978-05-16

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

323 435R, 361 5, H02H 722, H02P 1304

Patent

active

040902250

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.

REFERENCES:
patent: 3436646 (1969-04-01), Prescott
patent: 3515980 (1970-06-01), Throop
patent: 3602807 (1971-08-01), Prescott

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