US1686689A - Voltmeter - Google Patents
Voltmeter Download PDFInfo
- Publication number
- US1686689A US1686689A US713439A US71343924A US1686689A US 1686689 A US1686689 A US 1686689A US 713439 A US713439 A US 713439A US 71343924 A US71343924 A US 71343924A US 1686689 A US1686689 A US 1686689A
- Authority
- US
- United States
- Prior art keywords
- conductor
- conductors
- corona
- voltage
- voltmeter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
Definitions
- VlSlbl8'- corona discharge is produced at the surface of one conductor when the voltage gradient at the surface of this conductor is sufficiently great.
- the critical value of the voltage gradient is definitely fixed within narrow limits so that the discharge may be utilized in a voltage-measuring instrument.
- corona conductor and the corresponding applied voltage required to initiatecorona discharge.
- the formation of corona isindicated by an ammeter connectedin series with the corona voltmeter, a sharp deflection of the ammeter being obtained upon the formation of the corona discharge.
- l represents a conductor, the potential of which it is desiredto determine.
- Surrounding theconductor 1 is a hollow cylindrical conductor 2, having insulated flared ends 3 to produce a uniform electrostatic field.
- the conductor 2 is pivotally mounted upon an eccentric axis 4: and is provided With a pointer 5. As the conductor 2 is turned about the axis/l, the pointer 5 indicates its angular position uponthe scale 6.
- a current-measuring instrument 7 which may be of the DArsonval type, is connected to the conductor 2.
- the movable conductor 2 is turned about the axis 4:- from its initial position shown until a. sharp deflection of the ammeter 7 indicates that corona discharge has been formed between conductors 1 and 2.
- the pointer 5 indicates the potential of the conductor 1, the scale 6 being preferably calibrated .to read voltages directly.
- a voltmeter operable by means of corona discharge comprising normally concentric conductors having opposed cylindrical surfaces, one of said conductors being movable about an eccentric axis.
- a stationary conductor In combination, a stationary conductor, a movable conductor encircling said stationary conductor, means for changing the distance between the movable and the stationary conductors, means for indicating an electrical phenomena between said conductors, and means associated with said movable conductor for indicating the voltage producing said phenomena.
- An electrostatic voltage-measuring system comprising a stationary elongated conductor, a hollow cylindrical conducting body encircling said conductor, said body being movable about an eccentric axis with respect to said conductor. whereby the distancebetween the body and the conductor may be changed, means for indicating the formation of corona between said body and said conductor, and a scale. associated with said movable body'for indicating'the magnitude of the voltage producing said corona;
- An electrostatic voltmeter comprising CHARLES LE G, FORTESGUE.
Description
Oct. 9, 1928. 1,686,689
c; LE G. FORTESCUE VOLTMETER Filed y 15, 1924 WITNESSES: INVENTOR Charles LeG. Forfescue.
Patented Oct. 9, 1928.
UNIT so ,s TA
TES, PATENT o 1 clE.-
CHAIEtLTEiS LE G. FORTESCUE, CF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WEST- I INGEGUSE ELECTRIC & MANUFACTURING COMPANY, CORPORATION OF PENN".-
svrrvanm,
Application lfiled May 15,
tween two conductors is raised, a VlSlbl8'- corona discharge is produced at the surface of one conductor when the voltage gradient at the surface of this conductor is sufficiently great. For a given air pressure and temperature, the critical value of the voltage gradientis definitely fixed within narrow limits so that the discharge may be utilized in a voltage-measuring instrument.
In order to obtain an instrument which would cover a range of voltages,that is, form a corona discharge for any one of the several voltages,-it has been proposed to enclose the conductor in a suitable container and vary the temperature or pressure of the surrounding medium. This is a rather troublesome method and requires complicated apparatus.
Since the corona discharge is a function of the voltage gradient, it has also been proposed to construct an instrument covering a range of voltages by employing conductors of different sizes or a tapered conductor, as disclosed in U. S. Patent No. 1,289,068, issued December 31, 1918, to C. T. Allcutt and assigned to the Westinghouse Electric & Mfg. Company. The first mentioned arrangement was found undesirable because of the necessity for substituting different conductors and because the employment of conductors of difierent sizes permitted voltage readings only in steps. The latter device described in the Allcutt patent is rather complicated as it requires a shield for thetapered conductor.
Itis the objectof my invention to provide a simpler but equally effective corona voltmeter that will'read directly over a range of voltages by corona discharge. I obtain this result by employing two relatively movable conductors so arranged that varying the relationship of the conductors varies the voltage gradient upon the corona-forming conductor and thereby changes the required applied VOL'IVQMETER.
1924. Serial No. 713,439.
voltage for producing the corona discharge.
conductor and the corresponding applied voltage required to initiatecorona discharge. The formation of corona isindicated by an ammeter connectedin series with the corona voltmeter, a sharp deflection of the ammeter being obtained upon the formation of the corona discharge.
The detailed construction and the mode of operation of my. invention will be apparent from the accompanying drawings wherein Figure l is a plan View of one modification thereof, and Y i Fig. 2 is a side View of the same instrument.
lrepresents a conductor, the potential of which it is desiredto determine. Surrounding theconductor 1 is a hollow cylindrical conductor 2, having insulated flared ends 3 to produce a uniform electrostatic field. The conductor 2 is pivotally mounted upon an eccentric axis 4: and is provided With a pointer 5. As the conductor 2 is turned about the axis/l, the pointer 5 indicates its angular position uponthe scale 6. A current-measuring instrument 7 which may be of the DArsonval type, is connected to the conductor 2.
The operation of the device is as follows:
In order to measure the potential of the conductor 1, the movable conductor 2 is turned about the axis 4:- from its initial position shown until a. sharp deflection of the ammeter 7 indicates that corona discharge has been formed between conductors 1 and 2. At this .point,'the pointer 5 indicates the potential of the conductor 1, the scale 6 being preferably calibrated .to read voltages directly. e
is rotated about the axis 4, apart of the sur face of conductor 2 is brought nearer-to. the conductor 1, thereby increasing the voltage gradient at the surfaceof the latter. This voltage gradient is increased by the movement of the conductor 2 until corona forms upon the conductor 1. As we have'seen, for a given pressure and temperature, the forma tion of corona depends solely upon the voltage gradient. Therefore, the angular position of the conductor 2, as indicated by the pointer 5, provides a direct indication of the potential of conductor 1.
i I claim:
1. A voltmeter operable by means of corona discharge comprising normally concentric conductors having opposed cylindrical surfaces, one of said conductors being movable about an eccentric axis.
2. In combination, two normally concentric conductors one of which is rotativcly supported upon an eccentric axis, and a coronadischarge-indicating device connected to one of said conductors.
3: In combination, a stationary conductor, a movable conductor encircling said stationary conductor, means for changing the distance between the movable and the stationary conductors, means for indicating an electrical phenomena between said conductors, and means associated with said movable conductor for indicating the voltage producing said phenomena.
4. An electrostatic voltage-measuring systemcomprising a stationary elongated conductor, a hollow cylindrical conducting body encircling said conductor, said body being movable about an eccentric axis with respect to said conductor. whereby the distancebetween the body and the conductor may be changed, means for indicating the formation of corona between said body and said conductor, and a scale. associated with said movable body'for indicating'the magnitude of the voltage producing said corona;
5. An electrostatic voltmeter comprising CHARLES LE G, FORTESGUE.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US713439A US1686689A (en) | 1924-05-15 | 1924-05-15 | Voltmeter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US713439A US1686689A (en) | 1924-05-15 | 1924-05-15 | Voltmeter |
Publications (1)
Publication Number | Publication Date |
---|---|
US1686689A true US1686689A (en) | 1928-10-09 |
Family
ID=24866145
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US713439A Expired - Lifetime US1686689A (en) | 1924-05-15 | 1924-05-15 | Voltmeter |
Country Status (1)
Country | Link |
---|---|
US (1) | US1686689A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4470007A (en) * | 1981-04-01 | 1984-09-04 | Baur Pruf - und Messtechnik KG | Apparatus for testing the electrical breakdown resistance potential of insulating media and/or cooling media |
-
1924
- 1924-05-15 US US713439A patent/US1686689A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4470007A (en) * | 1981-04-01 | 1984-09-04 | Baur Pruf - und Messtechnik KG | Apparatus for testing the electrical breakdown resistance potential of insulating media and/or cooling media |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9664720B2 (en) | Device for the contactless determination of an electrical potential of an object, current probe, and method | |
US2468125A (en) | Standing wave indicator | |
US1686689A (en) | Voltmeter | |
US1121835A (en) | Comparator. | |
US9121878B2 (en) | Method for contactless determination of electrical potential using oscillating electrode, and device | |
US1253211A (en) | Electrical testing device. | |
US2238610A (en) | Wire enameling | |
US2267539A (en) | Measuring instrument | |
US2261675A (en) | High-tension electrical measuring device | |
US2130829A (en) | Electrical measuring instrument | |
US3317822A (en) | Method and apparatus for measurement of high voltage | |
US1929714A (en) | Electrical measuring instrument | |
RU2298178C1 (en) | Vortex converter of displacements | |
US2431244A (en) | High-voltage metering apparatus | |
US1390743A (en) | Measuring device | |
US1289068A (en) | Electrical measuring instrument. | |
US1590451A (en) | Crest volt meter | |
US1050694A (en) | Electrical measuring instrument. | |
US1731873A (en) | Arc-gap device | |
US1600332A (en) | Josef haslauer | |
US2157823A (en) | High voltage measurement means | |
US1787879A (en) | Electrical instrument for measuring, indicating, and other purposes | |
US1121834A (en) | Electrical measuring apparatus. | |
US999800A (en) | Electrical measuring instrument. | |
US1652917A (en) | Electric measuring apparatus |