Circuit arrangement for large power transformers
Patent 4678927 Issued on July 7, 1987. Estimated Expiration Date: 
October 18, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 18, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2172677 2395116 2547614 3419792 3601622 3684949 3794850 High voltage protection circuit Fail-safe circuit for tap-changing transformer regulating system Arcless tap changer for voltage regulator InventorsAssigneeApplicationNo. 06/662239 filed on 10/18/1984US Classes:307/104, ELECTROMAGNET OR HIGHLY INDUCTIVE SYSTEMS307/105, WITH HARMONIC FILTER OR NEUTRALIZER323/340, Having a variable length winding (e.g., tapped) as the final control device336/146, Inductance change in plural coils361/3, Synchronized or sequential opening or closing363/48For semiconductor rectifierExaminersPrimary: Shoop, William M. Jr.Assistant: Ip, Shik Luen Paul Attorney, Agent or FirmInternational ClassesH01F 29/02 (20060101)H01F 29/00 (20060101) H01F 27/34 (20060101) Foreign Application Priority Data1983-10-20 DEAbstractA circuit arrangement for large power transformers with a low-voltage winding, a main high-voltage winding and a step winding as well as a step switching device at a Y-point side thereof, includes, at a location between a point connecting the step winding to the high-voltage main winding and the Y-point of the transformer, a capacitor in series with a resistor is connected electrically parallel to respectively current-carrying steps of the step winding, the capacitor and the resistor being of such dimensions as to decrease resonance amplitudes of the connecting point to ground, the capacitor being constructed of spirally wound strip lines formed of a resistance alloy, the strip lines being also of such dimensions as to reduce resonance amplitudes of the connecting points.Other References
| |
