US3729650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Potential-current transformer device
Assignee: Individual
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Filing: 1972-02-07
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Granted: 1973-04-24
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Expires: 1992-02-07
Abstract
Abstract The line potential and current measuring device consists of a standard or toroidal bushing current transformer, a desired number of cascaded current transformers connected in parallel with a series of precision or non-precision type grading impedance devices such as resistors, capacitors or the like alone or in conjunction with a low-loss potential transformer. This supplies electrical outputs which make the device suitable for accurately checking line potential and current on an indicating or recording instrument.
Inventors
- 👤 R Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:06
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/20; H01F38/22; H01F38/34; H01F38/36
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
140 words
In a system for measuring the current and potential in a high voltage A.C. line, a hollow insulator, a transformer supported by said insulator, a plurality of cascaded transformers supported within the insulator and connected to the transformer circuit, means for insulating said cascade transformers from each other, the secondary winding of each transformer being connected to the primary winding of the adjacent transformer, a first terminal connected to the primary windings of the last one of said cascade transformers, a plurality of series connected impedance elements connected in parallel to said cascade transformers, and a second terminal to which the end of said seriesed impedance is connected, whereby current measuring means connected to said first terminal and to ground obtains a current reading and potential measuring means connected to said second terminal and to ground obtains a potential reading.
Claim 2
Dependent Claim
140 words
In a system for measuring the current and potential in a high voltage A.C. line, a hollow insulator, a transformer supported by said insulator, a plurality of cascaded transformers supported within the insulator and connected to the transformer circuit, means for insulating said cascade transformers from each other, the secondary winding of each transformer being connected to the primary winding of the adjacent transformer, a first terminal connected to the primary windings of the last one of said cascade transformers, a plurality of series connected impedance elements connected in parallel to said cascade transformers, and a second terminal to which the end of said seriesed impedance is connected, whereby current measuring means connected to said first terminal and to ground obtains a current reading and potential measuring means connected to said second terminal and to ground obtains a potential reading.
Claim 3
Dependent Claim
39 words
In a system for measuring the current and potential as recited in claim 1, wherein a potential and current factor applied to said readings provides accurate readings for the potential and current in said high voltage A. C. line.
Claim 4
Dependent Claim
44 words
In a system for measuring the current and potential as recited in claim 1, wherein a transformer is connected at the bottom end of the seriesed connected impedance elements and to ground with the secondary winding connected to the second terminal and to ground.
Claim 5
Dependent Claim
161 words
In a system for measuring the current and potential in a high voltage A.C. line, a plurality of cascaded transformers, a plurality of seriesed impedance elements disposed in parallel with said cascaded transformers, an insulating housing containing said cascaded transformers and impedance elements, a current transformer having a primary subjected to the line current to be measured the secondary of which is connected to the primary of the adjacent cascaded transformer, the secondary of which and the other cascaded transformers being connected to the primary of the adjacent cascaded transformer, a first terminal connected to the secondary of the bottom-most cascaded transformer, a second terminal connected to the bottom end of the seriesed impedance elements, whereby a meter connected between the second terminal and ground will provide a potential reading which is proportional to that of the line, and a meter connected between the first terminal and ground will provide a current reading which is proportional to that of the line.
Claim 6
Dependent Claim
161 words
In a system for measuring the current and potential in a high voltage A.C. line, a plurality of cascaded transformers, a plurality of seriesed impedance elements disposed in parallel with said cascaded transformers, an insulating housing containing said cascaded transformers and impedance elements, a current transformer having a primary subjected to the line current to be measured the secondary of which is connected to the primary of the adjacent cascaded transformer, the secondary of which and the other cascaded transformers being connected to the primary of the adjacent cascaded transformer, a first terminal connected to the secondary of the bottom-most cascaded transformer, a second terminal connected to the bottom end of the seriesed impedance elements, whereby a meter connected between the second terminal and ground will provide a potential reading which is proportional to that of the line, and a meter connected between the first terminal and ground will provide a current reading which is proportional to that of the line.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |