Patent US4054835A successfully refreshed from Google Patents.
US4054835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rapid response generating voltmeter
Assignee: General Electric Co
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Filing: 1976-11-22
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Granted: 1977-10-18
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Expires: 1996-11-22
Abstract
Abstract A rapid-response generating voltmeter for measuring a high d-c voltage between a high voltage electrode and ground comprises two sets of stator segments, the segments of each set being electrically interconnected and each set being connected through its own capacitor to ground. Each set of stator segments has a time-varying capacitance with respect to the high voltage electrode, but the sum of these time-varying capacitances is maintained substantially constant with time. First and second circuit means respectively sense the voltages e 1 and e 2 present across said two capacitors and develop first and second intermediate signals e 5 and e 6 substantially proportional to e 1 and e 2 , respectively, minus, in each case, an error voltage attributable to discharge of the associated one of said capacitors. Summing means develops an output signal substantially proportional to the instantaneous sum of e 5 and e 6 , and this output signal is substantially proportional to the high d-c voltage being measured.
Inventors
- 👤 Edward Joseph Los
- 👤 David Russell Humphreys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:07
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/12; G01R15/00; G01R15/14; G01R15/16
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
458 words
In a rapid-response generating voltmeter for measuring a high d-c voltage applied between first and second spaced-apart points, a. a first electrode adapted to operate at the potential of said first point, b. a second electrode spaced from said first electrode and comprising a first stator including a plurality of segments arranged in angularly-spaced relationship about a predetermined center and electrically connected together so as to be at the same potential as each other, c. a first capacitor connected between said first stator and said second point, d. a third electrode spaced from said first electrode, electrically insulated from said second electrode, and comprising a second stator including a plurality of segments arranged in angularly-spaced relationship about said center and positioned physically between the segments of said first stator, the segments of said second stator being electrically interconnected so as to be at the same potential as each other, e. a second capacitor connected between said second stator and said second point, f. capacitance-varying means for periodically varying substantially simultaneously in opposite senses the capacitance between said first electrode and said second electrode and the capacitance between said first electrode and said third electrode, said capacitance-varying means comprising a rotatable rotor having vanes normally at the potential of said second point located between said first electrode on one hand and the segments of said stators on the other hand, rotation of said rotor causing said vanes to gradually cover the segments of one stator with respect to said first electrode as said vanes gradually uncover the segments of the other stator with respect to said first electrode, g. said rotor vanes effectively completely covering the segments of said first stator at successive instants spaced in time by predetermined successive first intervals, h. first circuit means for sensing the voltage across said first capacitor and for developing during said first intervals a first intermediate signal varying in magnitude directly in accordance with: the voltage then present across said first capacitor minus a first error voltage substantially equal to the voltage across said first capacitor at the start of each of said first intervals, i. said rotor vanes effectively completely covering the segments of said second stator at successive instants spaced in time by predetermined successive second intervals, j. second circuit means for sensing the voltage across said second capacitor and for developing during said second intervals a second intermediate signal varying in magnitude directly in accordance with the voltage then present across said second capacitor minus an error voltage substantially equal to the voltage across said second capacitor at the start of each of said second intervals, k. and summing means for developing an output signal substantially proportional to the instantaneous sum of said first and second intermediate signals.
Claim 2
Dependent Claim
458 words
In a rapid-response generating voltmeter for measuring a high d-c voltage applied between first and second spaced-apart points, a. a first electrode adapted to operate at the potential of said first point, b. a second electrode spaced from said first electrode and comprising a first stator including a plurality of segments arranged in angularly-spaced relationship about a predetermined center and electrically connected together so as to be at the same potential as each other, c. a first capacitor connected between said first stator and said second point, d. a third electrode spaced from said first electrode, electrically insulated from said second electrode, and comprising a second stator including a plurality of segments arranged in angularly-spaced relationship about said center and positioned physically between the segments of said first stator, the segments of said second stator being electrically interconnected so as to be at the same potential as each other, e. a second capacitor connected between said second stator and said second point, f. capacitance-varying means for periodically varying substantially simultaneously in opposite senses the capacitance between said first electrode and said second electrode and the capacitance between said first electrode and said third electrode, said capacitance-varying means comprising a rotatable rotor having vanes normally at the potential of said second point located between said first electrode on one hand and the segments of said stators on the other hand, rotation of said rotor causing said vanes to gradually cover the segments of one stator with respect to said first electrode as said vanes gradually uncover the segments of the other stator with respect to said first electrode, g. said rotor vanes effectively completely covering the segments of said first stator at successive instants spaced in time by predetermined successive first intervals, h. first circuit means for sensing the voltage across said first capacitor and for developing during said first intervals a first intermediate signal varying in magnitude directly in accordance with: the voltage then present across said first capacitor minus a first error voltage substantially equal to the voltage across said first capacitor at the start of each of said first intervals, i. said rotor vanes effectively completely covering the segments of said second stator at successive instants spaced in time by predetermined successive second intervals, j. second circuit means for sensing the voltage across said second capacitor and for developing during said second intervals a second intermediate signal varying in magnitude directly in accordance with the voltage then present across said second capacitor minus an error voltage substantially equal to the voltage across said second capacitor at the start of each of said second intervals, k. and summing means for developing an output signal substantially proportional to the instantaneous sum of said first and second intermediate signals.
Claim 3
Dependent Claim
443 words
In a rapid-response generating voltmeter for measuring a high d-c voltage applied between first and second spaced-apart points, a. a first electrode adapted to operate at the potential of said first point, b. a second electrode spaced from said first electrode and comprising a first stator including a plurality of segments arranged in angularly-spaced relationship about a predetermined center and electrically connected together so as to be at the same potential as each other, c. a first capacitor connected between said first stator and said second point, d. a third electrode spaced from said first electrode, electrically insulated from said second electrode, and comprising a second stator including a plurality of segments arranged in angularly-spaced relationship about said center and positioned physically between the segments of said first stator, the segments of said second stator being electrically interconnected so as to be at the same potential as each other, e. a second capacitor connected between said second stator and said second point, f. capacitance-varying means for periodically varying substantially simultaneously in opposite senses the capacitance between said first electrode and said second electrode and the capacitance between said first electrode and said third electrode, said capacitance-varying means comprising a rotatable rotor having vanes normally at the potential of said second point located between said first electrode on one hand and the segments of said stators on the other hand, rotation of said rotor causing said vanes to gradually cover the segments of one stator with respect to said first electrode as said vanes gradually uncover the segments of the other stator with respect to said first electrode, g. first circuit means for sensing the voltage across said first capacitor while said rotor is rotating and for developing a first intermediate signal varying in magnitude directly in accordance with: the instantaneous voltage then present across said first capacitor minus a first error voltage substantially equal to the voltage appearing across said first capacitor at the immediately-preceding instant when the segments of said first stator were effectively completely covered by the vanes of said rotating rotor, h. second circuit means for sensing the voltage across said second capacitor while said rotor is rotating and for developing a second intermediate signal varying in magnitude directly in accordance with: the instantaneous voltage then present across said second capacitor minus a second error voltage substantially equal to the voltage appearing across said second capacitor at the immediately-preceding instant when the segments of said second stator were effectively completely covered by the vanes of said rotating rotor, and i. summing means for developing an output signal substantially proportional to the instantaneous sum of said first and second intermediate signals.
Claim 4
Dependent Claim
443 words
In a rapid-response generating voltmeter for measuring a high d-c voltage applied between first and second spaced-apart points, a. a first electrode adapted to operate at the potential of said first point, b. a second electrode spaced from said first electrode and comprising a first stator including a plurality of segments arranged in angularly-spaced relationship about a predetermined center and electrically connected together so as to be at the same potential as each other, c. a first capacitor connected between said first stator and said second point, d. a third electrode spaced from said first electrode, electrically insulated from said second electrode, and comprising a second stator including a plurality of segments arranged in angularly-spaced relationship about said center and positioned physically between the segments of said first stator, the segments of said second stator being electrically interconnected so as to be at the same potential as each other, e. a second capacitor connected between said second stator and said second point, f. capacitance-varying means for periodically varying substantially simultaneously in opposite senses the capacitance between said first electrode and said second electrode and the capacitance between said first electrode and said third electrode, said capacitance-varying means comprising a rotatable rotor having vanes normally at the potential of said second point located between said first electrode on one hand and the segments of said stators on the other hand, rotation of said rotor causing said vanes to gradually cover the segments of one stator with respect to said first electrode as said vanes gradually uncover the segments of the other stator with respect to said first electrode, g. first circuit means for sensing the voltage across said first capacitor while said rotor is rotating and for developing a first intermediate signal varying in magnitude directly in accordance with: the instantaneous voltage then present across said first capacitor minus a first error voltage substantially equal to the voltage appearing across said first capacitor at the immediately-preceding instant when the segments of said first stator were effectively completely covered by the vanes of said rotating rotor, h. second circuit means for sensing the voltage across said second capacitor while said rotor is rotating and for developing a second intermediate signal varying in magnitude directly in accordance with: the instantaneous voltage then present across said second capacitor minus a second error voltage substantially equal to the voltage appearing across said second capacitor at the immediately-preceding instant when the segments of said second stator were effectively completely covered by the vanes of said rotating rotor, and i. summing means for developing an output signal substantially proportional to the instantaneous sum of said first and second intermediate signals.
Claim 5
Dependent Claim
54 words
The voltmeter of claim 2 in which at least one of said first and second circuit means includes gain adjusting means adjustable to make the intermediate signal developed by the associated circuit means substantially equal in amplitude to that of the other intermediate signal when the voltmeter is measuring a constant d-c high voltage.
Claim 6
Dependent Claim
135 words
The voltmeter of claim 2 in which said first circuit means includes: a. means for deriving a first signal substantially proportional by a predetermined multiplier to the instantaneous voltage across said first capacitor, b. a first sample-and-hold circuit that acts to provide a first correction signal proportional also by said predetermined multiplier to the voltage across said first capacitor each time the segments of said first stator are effectively completely covered by the vanes of said rotor, the amplitude of said correction signal being maintained substantially constant between successive instants at which said segments of said first stator are effectively completely covered, c. and first difference circuit means for subtracting said first correction signal from said first signal and for developing said first intermediate signal substantially in proportion to the difference resulting from said substraction.
Claim 7
Dependent Claim
139 words
The voltmeter of claim 4 in which said second circuit means includes: a. means for deriving a second signal substantially proportional by a predetermined second multiplier to the instantaneous voltage across said second capacitor, b. a second sample-and-hold circuit that acts to provide a second correction signal proportional also by said second predetermined multiplier to the voltage across said second capacitor each time the segments of said second stator are effectively completely covered by the vanes of said rotor, the amplitude of said second correction signal being maintained substantially constant between successive instants at which the segments of said second stator are effectively completely covered, c. and second different circuit means for subtracting said second correction signal from said second signal and for developing said second intermediate signal substantially in proportion to the difference resulting from said latter subtraction.
Claim 8
Dependent Claim
84 words
The generating voltmeter of claim 2 in which: a. said first intermediate signal developed by said first circuit means is a time-varying signal having a dominant frequency proportional to the rotational speed of said rotor, b. said second intermediate signal developed by said second circuit means is a time-varying signal having a dominant frequency proportional to the rotational speed of said rotor, c. said two intermediate signals are approximately 180° out of phase with each other, considered with respect to their dominant frequency waveforms.
Claim 9
Dependent Claim
42 words
The generating voltmeter of claim 6 in which the sum of (i) the capacitance between said first electrode and said second electrode and (ii) the capacitance between said first electrode and said third electrode remains substantially constant during rotation of said rotor.
Claim 10
Dependent Claim
29 words
The generating voltmeter of claim 6 in which: said first and second intermediate signals sum to a constant when the voltmeter is measuring a constant level of high voltage.
Claim 11
Dependent Claim
42 words
The generating voltmeter of claim 8 in which the sum of (i) the capacitance between said first electrode and said second electrode and (ii) the capacitance between said first electrode and said third electrode remains substantially constant during rotation of said rotor.
Claim 12
Dependent Claim
42 words
The generating voltmeter of claim 2 in which the sum of: (i) the capacitance between said first electrode and said second electrode and (ii) the capacitance between said first electrode and said third electrode remains substantially constant during rotation of said rotor.
Claim 13
Dependent Claim
42 words
The generating voltmeter of claim 4 in which the sum of: (i) the capacitance between said first electrode and said second electrode and (ii) the capacitance between said first electrode and said third electrode remains substantially constant during rotation of said rotor.
Claim 14
Dependent Claim
42 words
The generating voltmeter of claim 5 in which the sum of: (i) the capacitance between said first electrode and said second electrode and (ii) the capacitance between said first electrode and said third electrode remains substantially constant during rotation of said rotor.
Claim 15
Dependent Claim
73 words
The generating voltmeter of claim 2 in which: a. said first capacitor is large with respect to the capacitance between said first electrode and said second electrode even when the stator segments of said second electrode are effectively completely uncovered, and b. said second capacitor is large with respect to the capacitance between said first electrode and said third electrode even when the stator segments of said third electrode are effectively completely uncovered.
Claim 16
Dependent Claim
29 words
The generating voltmeter of claim 2 in which said first and second intermediate signals sum to a constant when the voltmeter is measuring a constant level of high voltage.
References Cited (Backward Citations)
US2877308A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |