US4240031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for measuring the potential of an alternating current carrying inner conductor of an encased high-voltage switching mechanism
Assignee: BBC Brown Boveri AG Switzerland
•
Filing: 1979-02-27
•
Granted: 1980-12-16
•
Expires: 1999-02-27
Abstract
Abstract A device for measuring the electrical potential of the inner conductor in an encased high-voltage switching mechanism filled with a gaseous insulator includes an active, capacitive voltage divider. One capacitor of the voltage divider is located within the grounded metal casing of the switching mechanism and is connected with an input terminal of an amplifier. The amplifier is supplied with power from the inner conductor and has a feedback path including the second capacitor of the voltage divider. In order to accurately perform voltage measurements independent of the pressure and temperature of the insulator within the casing, the feedback capacitor is also installed inside the metal casing. This arrangement enables the ratio of the capacitances of the two capacitors, which determines the quality of the voltage measurement, to remain constant over a large pressure and temperature range.
Inventors
- 👤 Andreas Siegenthaler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:40
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/14; G01R15/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
A device for measuring the electrical potential of an inner conductor of a high-voltage switching mechanism having a grounded metal casing which is filled with an insulating material, comprising: a first capacitor located within the insulator filled casing including a high voltage electrode comprised of said inner conductor and a test electrode; an amplifier having an input terminal connected to said test electrode; and a second capacitor located within said insulator filled casing which is connected to said first capacitor and coupled to said amplifier in a feedback path.
Claim 2
Independent Claim
89 words
A device for measuring the electrical potential of an inner conductor of a high-voltage switching mechanism having a grounded metal casing which is filled with an insulating material, comprising: a first capacitor located within the insulator filled casing including a high voltage electrode comprised of said inner conductor and a test electrode; an amplifier having an input terminal connected to said test electrode; and a second capacitor located within said insulator filled casing which is connected to said first capacitor and coupled to said amplifier in a feedback path.
Claim 3
Dependent Claim
23 words
The measuring device of claim 1 wherein one of the electrodes of said second capacitor is the test electrode of said first capacitor.
Claim 4
Dependent Claim
31 words
The measuring device of claim 2 wherein the electrodes of said second capacitor are symmetrical about an axis of rotation which is perpendicular to a central axis of said inner conductor.
Claim 5
Dependent Claim
48 words
The measuring device of claim 3 wherein the electrodes of said second capacitor include two cylindrical plates having different diameters and forming recesses such that the electrode plate of smaller diameter can be placed within the electrode plate of larger diameter without contacting said larger diameter electrode plate.
Claim 6
Dependent Claim
39 words
The measuring device of claim 4 wherein each of said two plates is supported by an insulator and wherein said larger diameter plate has an opening which permits insulating material to enter the recesses formed between said two plates.
Claim 7
Dependent Claim
48 words
The measuring device of claim 5 wherein said metal casing includes a branch pipe in which said two electrode plates are housed and further wherein the insulator which supports said larger diameter plate is annular in shape and forms a flange at an end of said branch pipe.
Claim 8
Dependent Claim
41 words
The measuring device of claim 2, 3, 4, 5 or 6 further including an adjustable transformer having a primary winding connected to an output terminal of said amplifier and a secondary winding connected to the other electrode of said second capacitor.
Claim 9
Dependent Claim
58 words
The measuring device of claim 7 further including means for supplying power to said amplifier comprising: a third capacitor having one electrode connected to said inner conductor; a step-up transformer having a primary winding connected to the other electrode of said third capacitor; and a rectifier circuit connecting a secondary winding of said step-up transformer to said amplifier.
Claim 10
Dependent Claim
49 words
The measuring device of claim 8 further including a voltage limiting circuit element connected to the primary winding of said step-up transformer, further wherein said rectifier circuit includes two electrolytic capacitors and a pair of diodes connected so as to provide charging of said capacitors in one direction only.
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) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |