US4975649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for sensing loss of regulation in a ferroresonant transformer
Assignee: Alpha Technologies Inc
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Filing: 1989-12-18
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Granted: 1990-12-04
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Expires: 2009-12-18
Abstract
Abstract A method and apparatus for detecting the loss of regulation in ferroresonant transformer is disclosed. The flux in the magnetic shunts is sensed by a winding. The resulting signal is differentiated. If the differentiated signal contains pulses, regulation is present, if no pulses are found the transformer is not in regulation.
Inventors
- 👤 Howard H. Bobry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:59
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/04; G05F3/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
111 words
A method for sensing loss of regulation in a ferroresonant transformer having a primary winding adapted to generate a primary flux, a secondary winding magnetically coupled to said primary winding and adapted to generate a secondary flux and a shunt providing a shunt path for a portion of said primary and secondary fluxes, said portion of said primary and secondary fluxes constituting a shunt flux, the method comprising: producing a signal representative of said shunt flux; differentiating said signal to provide a derivative; and detecting spikes in said derivative, wherein said transformer is in regulation if spikes are detected or said transformer is not in regulation if no spikes are detected.
Claim 2
Independent Claim
111 words
A method for sensing loss of regulation in a ferroresonant transformer having a primary winding adapted to generate a primary flux, a secondary winding magnetically coupled to said primary winding and adapted to generate a secondary flux and a shunt providing a shunt path for a portion of said primary and secondary fluxes, said portion of said primary and secondary fluxes constituting a shunt flux, the method comprising: producing a signal representative of said shunt flux; differentiating said signal to provide a derivative; and detecting spikes in said derivative, wherein said transformer is in regulation if spikes are detected or said transformer is not in regulation if no spikes are detected.
Claim 3
Dependent Claim
23 words
A method according to claim 1, wherein, said signal is produced by a winding around at least a portion of said shunt flux.
Claim 4
Dependent Claim
43 words
A method according to claim 1, wherein, said signal is produced by a winding around at least a portion of said primary flux and another winding around at least a portion of said secondary flux, said windings being connected in inverted series relationship.
Claim 5
Independent Claim
133 words
An apparatus for sensing loss of regulation in a ferroresonant transformer having a primary winding adapted to generate a primary flux, a secondary winding magnetically coupled to said primary winding and adapted to generate a secondary flux and a shunt providing a shunt path for a portion of said primary and secondary fluxes, said portion of said primary and secondary fluxes constituting a shunt flux, the apparatus comprising: shunt flux sensing means in sensing proximity of at least one of said fluxes; a differentiator having an input and an output, said input being connected to said sensing means; and a pulse detector connected to said differentiator output, wherein said transformer is in regulation if spikes are detected by said pulse detector or said transformer is not in regulation if no spikes are detected.
Claim 6
Independent Claim
133 words
An apparatus for sensing loss of regulation in a ferroresonant transformer having a primary winding adapted to generate a primary flux, a secondary winding magnetically coupled to said primary winding and adapted to generate a secondary flux and a shunt providing a shunt path for a portion of said primary and secondary fluxes, said portion of said primary and secondary fluxes constituting a shunt flux, the apparatus comprising: shunt flux sensing means in sensing proximity of at least one of said fluxes; a differentiator having an input and an output, said input being connected to said sensing means; and a pulse detector connected to said differentiator output, wherein said transformer is in regulation if spikes are detected by said pulse detector or said transformer is not in regulation if no spikes are detected.
Claim 7
Dependent Claim
24 words
An apparatus method according to claim 4, wherein, said flux sensing means comprises a winding around at least a portion of said shunt flux.
Claim 8
Dependent Claim
43 words
An apparatus according to claim 4, wherein, said flux sensing means comprises a winding around at least a portion of said primary flux and another winding around at least a portion of said secondary flux, said windings being connected in inverted series relationship.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-03 | 1994-06-04 | 1994-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-03 | 1998-06-04 | 1998-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-03 | 2002-06-04 | 2002-12-04 | $7700.00 | Window Closed / Lapsed |