WO2009153824A1 - Capacitive sensor to sense an electric field generated by a conductor - Google Patents
Capacitive sensor to sense an electric field generated by a conductor Download PDFInfo
- Publication number
- WO2009153824A1 WO2009153824A1 PCT/IT2009/000264 IT2009000264W WO2009153824A1 WO 2009153824 A1 WO2009153824 A1 WO 2009153824A1 IT 2009000264 W IT2009000264 W IT 2009000264W WO 2009153824 A1 WO2009153824 A1 WO 2009153824A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- capacitive sensor
- sensor according
- spherical dome
- screened
- chamber
- Prior art date
Links
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
- G01R15/16—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices
- G01R15/165—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices measuring electrostatic potential, e.g. with electrostatic voltmeters or electrometers, when the design of the sensor is essential
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/12—Measuring electrostatic fields or voltage-potential
Definitions
- the present invention relates to a capacitive sensor for sensing an electrical field generated by a live conductor, for example in order to determine the voltage of the conductor under examination with respect to the detected electrical field.
- the present invention relates to a capacitive sensor which enables the electrical field generated by a single live conductor to be detected without being affected by any surrounding electrical fields, such as the electrical fields generated by other conductors located nearby, with particular application to the technical field of measuring instruments and equipment for low, medium and high voltage lines and/or substations.
- Prior art -Known capacitive sensors for measuring electrical fields generated by live conductors do not enable the user to avoid the effect of surrounding electrical fields and/or to obtain sufficiently accurate measurements of the electrical field or of quantities derived therefrom.
- the object of the present invention is to overcome the aforementioned drawbacks.
- the invention resolves the problem of creating a capacitive sensor for sensing an electrical field generated by a live conductor, in which said capacitive sensor extends along a longitudinal axis, in which said capacitive sensor comprises a source electrode connected to the conductor, an electrical field sensor, and a signal treatment circuit, and in which said capacitive sensor is characterized in that said source electrode is made to form a first screened inner chamber, in that said electrical field sensor is placed inside said first screened inner chamber, and in that said electrical field sensor is placed close to and spaced apart from said source electrode, in order to detect the electrical field generated by said source electrode.
- FIG. 3 shows schematically a third embodiment of the capacitive sensor proposed by the present invention.
- the capacitive sensor of the present invention extends along a longitudinal axis Y and has a proximal end which is, for example, associated with a low, medium or high voltage conductor or bar A.
- -Said capacitive sensor substantially comprises a first source electrode 10, an electrical field sensor 20, an electrical cable 30, a signal treatment circuit 40 and a screen element 50, these elements being embedded and positioned in and by means of a body 60 of dielectric material which forms an outer casing.
- this is connected to the conductor A, for example by means of a spacer terminal 14, and said first source electrode 10 is shaped so as to form a first screened inner chamber 12, which essentially prevents the entry of any electrical field lines that may be generated, for example, by other conductors positioned in the vicinity of the conductor A.
- said first chamber 12 there is housed the electrical field sensor 20, which is placed close to and spaced apart from said source electrode 10, in order to detect the field lines emitted by said first source electrode 10.
- said source electrode 10 is shaped in the form of a first spherical dome 11 , made from conductive material, which forms within itself the first chamber 12 which is screened, while the electrical field sensor 20, in this specific embodiment, is shaped in the form of a second spherical dome 21 placed inside the chamber 12, in which said first spherical dome 11 and said second spherical dome 21 preferably, but not exclusively, have their vertices V10 and V20 aligned with respect to the axis Y of the capacitive sensor, in order to place the inner surface 13 of the first spherical dome 11 and the outer surface 22 of the second spherical dome 21 so that they are equally spaced apart, with a minimum radial distance D1 , in such a way that the dielectric strength of the dielectric body 60 is not exceeded and consequently the requisite level of insulation is provided, while the insulating properties of the dielectric medium are safeguarded and maintained over time.
- said capacitive sensor can also comprise a second tubular screen element 50, extending along its own axis Y50 which is positioned coaxially with the axis Y of the capacitive sensor, in which said screen element 50 has a proximal end portion 51 placed inside said first chamber 12, and more specifically inside the inner chamber 23 formed by the second spherical dome 21 , and a distal portion 52 capable of forming a corresponding screened chamber 53 in which is placed the signal treatment circuit 40 together with a screened duct 54 for the purpose of putting the chamber 23 into communication with the chamber 53, in which is housed the cable 30 which connects the electrical field sensor 20 to the signal treatment circuit 40.
- a second tubular screen element 50 extending along its own axis Y50 which is positioned coaxially with the axis Y of the capacitive sensor, in which said screen element 50 has a proximal end portion 51 placed inside said first chamber 12, and more specifically inside the inner chamber 23 formed by the second spherical dome 21 , and
- the second spherical dome 21 and the tubular screen element 50 can be made by using various conductive materials, such as metallic and/or conductive sheet or mesh, and can also be produced by removing material from a solid body by machining.
- this shows a variant embodiment in which the electrical field sensor, indicated here by 120, is shaped in the form of a spherical segment 121 placed inside the first screened chamber 12 formed by said first spherical dome 11.
- said first spherical dome 11 and said spherical segment 121 have their vertices V10 and V120 aligned with respect to the axis Y of the sensor in order to ensure that the inner surface 13 of the first spherical dome 11 and the outer surface 122 of the spherical segment 121 are equally spaced from each other.
- this shows a variant embodiment in which the electrical field sensor, indicated here by 220, is shaped in the form of a circular plate 221 placed inside the screened chamber 12 formed by said first spherical dome 11.
- the source electrode 10 in the form of the first spherical dome 11 can be formed from suitably shaped sheets of conductive material and/or from meshes of conductive material and/or by machining from a solid and/or by other technical solutions without departure from the inventive concept of the present invention.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
A capacitive sensor for detecting an electrical field generated by a live conductor (A) comprises a source electrode connected to the conductor (A), an electrical field sensor, and a treatment circuit. Said source electrode (10) is designed to form a first screened inner chamber (12) and said electrical field sensor (20) is placed inside said first screened inner chamber (12), while the electrical field sensor (20) is also placed close to and spaced apart from said source electrode (10) in order to detect the electrical field emitted by said source electrode (10).
Description
Capacitive sensor to sense an electric field generated by a conductor
* *.*
Technical field
-The present invention relates to a capacitive sensor for sensing an electrical field generated by a live conductor, for example in order to determine the voltage of the conductor under examination with respect to the detected electrical field.
-More specifically, the present invention relates to a capacitive sensor which enables the electrical field generated by a single live conductor to be detected without being affected by any surrounding electrical fields, such as the electrical fields generated by other conductors located nearby, with particular application to the technical field of measuring instruments and equipment for low, medium and high voltage lines and/or substations.
Prior art -Known capacitive sensors for measuring electrical fields generated by live conductors do not enable the user to avoid the effect of surrounding electrical fields and/or to obtain sufficiently accurate measurements of the electrical field or of quantities derived therefrom.
* * * Object of the invention
-The object of the present invention is to overcome the aforementioned drawbacks.
-The invention, which is defined in the claims, resolves the problem of creating a capacitive sensor for sensing an electrical field generated by a live conductor, in which said capacitive sensor extends along a longitudinal axis, in which said capacitive sensor comprises a source electrode connected to the conductor, an electrical field sensor, and a signal treatment circuit, and in which said capacitive sensor is characterized in that said source electrode is made to form a first screened inner chamber, in that said electrical field sensor is placed inside said first screened inner chamber, and in that said electrical field sensor is placed close to and spaced apart from said source electrode, in order to detect the electrical field generated by said source electrode.
*_*_*
Brief description of the appended drawings
-The following description of the capacitive sensor proposed by the present invention, in various practical embodiments, is provided by way of non-limiting example and makes reference to the appended drawings, in which: -Figure 1 shows schematically a first embodiment of the capacitive sensor proposed by the present invention; -Figure 2 shows schematically a second embodiment of the capacitive sensor proposed by the present invention;
-Figure 3 shows schematically a third embodiment of the capacitive sensor proposed by the present invention.
* * *
Description of the first embodiment - Figure 1
-With reference to Figure 1 , the capacitive sensor of the present invention extends along a longitudinal axis Y and has a proximal end which is, for example, associated with a low, medium or high voltage conductor or bar A.
-Said capacitive sensor substantially comprises a first source electrode 10, an electrical field sensor 20, an electrical cable 30, a signal treatment circuit 40 and a screen element 50, these elements being embedded and positioned in and by means of a body 60 of dielectric material which forms an outer casing. -With reference to the first source electrode 10, this is connected to the conductor A, for example by means of a spacer terminal 14, and said first source electrode 10 is shaped so as to form a first screened inner chamber 12, which essentially prevents the entry of any electrical field lines that may be generated, for example, by other conductors positioned in the vicinity of the conductor A. -Within said first chamber 12 there is housed the electrical field sensor 20, which is placed close to and spaced apart from said source electrode 10, in order to detect the field lines emitted by said first source electrode 10.
-More specifically, said source electrode 10 is shaped in the form of a first spherical dome 11 , made from conductive material, which forms within itself the first chamber 12 which is screened, while the electrical field sensor 20, in this specific embodiment, is shaped in the form of a second spherical dome 21 placed inside the chamber 12, in which said first spherical dome 11 and said second spherical dome 21 preferably, but not exclusively, have their vertices V10 and
V20 aligned with respect to the axis Y of the capacitive sensor, in order to place the inner surface 13 of the first spherical dome 11 and the outer surface 22 of the second spherical dome 21 so that they are equally spaced apart, with a minimum radial distance D1 , in such a way that the dielectric strength of the dielectric body 60 is not exceeded and consequently the requisite level of insulation is provided, while the insulating properties of the dielectric medium are safeguarded and maintained over time.
-If desirable and/or useful, said capacitive sensor can also comprise a second tubular screen element 50, extending along its own axis Y50 which is positioned coaxially with the axis Y of the capacitive sensor, in which said screen element 50 has a proximal end portion 51 placed inside said first chamber 12, and more specifically inside the inner chamber 23 formed by the second spherical dome 21 , and a distal portion 52 capable of forming a corresponding screened chamber 53 in which is placed the signal treatment circuit 40 together with a screened duct 54 for the purpose of putting the chamber 23 into communication with the chamber 53, in which is housed the cable 30 which connects the electrical field sensor 20 to the signal treatment circuit 40.
-With reference to the first spherical dome 11 , the second spherical dome 21 and the tubular screen element 50, these can be made by using various conductive materials, such as metallic and/or conductive sheet or mesh, and can also be produced by removing material from a solid body by machining.
Description of the second embodiment - Figure 2
-With reference to Figure 2, this shows a variant embodiment in which the electrical field sensor, indicated here by 120, is shaped in the form of a spherical segment 121 placed inside the first screened chamber 12 formed by said first spherical dome 11. -More specifically, said first spherical dome 11 and said spherical segment 121 have their vertices V10 and V120 aligned with respect to the axis Y of the sensor in order to ensure that the inner surface 13 of the first spherical dome 11 and the outer surface 122 of the spherical segment 121 are equally spaced from each other.
Description of the third embodiment - Figure 3
-With reference to Figure 3, this shows a variant embodiment in which the electrical field sensor, indicated here by 220, is shaped in the form of a circular plate 221 placed inside the screened chamber 12 formed by said first spherical dome 11.
-With reference to the source electrode 10 in the form of the first spherical dome 11 , the electrical field sensor 20 in the form of the second spherical dome 21 , and the second tubular screen element 50, these can be formed from suitably shaped sheets of conductive material and/or from meshes of conductive material and/or by machining from a solid and/or by other technical solutions without departure from the inventive concept of the present invention.
-The above description of the capacitive sensor for detecting an electrical field is provided solely by way of non-limiting example, and clearly, therefore, said sensor can be modified or varied in any way suggested by experience and/or its use or application within the scope of the following claims.
-The following claims consequently also form an integral part of the above description.
Claims
Claims
01)-Capacitive sensor for detecting an electrical field generated by a live conductor (A), in which said capacitive sensor extends along a longitudinal axis (Y), in which said capacitive sensor comprises a source electrode connected to the live conductor (A), an electrical field sensor, and a circuit for treating the signal generated by the electrical field sensor, characterized in that said source electrode (10) is designed to form a first screened inner chamber (12), in that said electrical field sensor (20; 120; 220) is placed inside said first screened inner chamber (12), and in that said electrical field sensor (20; 120; 220) is placed close to and spaced apart from said source electrode (10) in order to detect the electrical field generated by said source electrode (10).
02)-Capacitive sensor according to Claim 1 , characterized in that said source electrode (10) is shaped in the form of a first spherical dome (11 ) the inside of which forms the first screened chamber (12). 03)-Capacitive sensor according to Claim 1 or 2, characterized in that said field sensor (20) is shaped in the form of a second spherical dome (21) placed inside the first chamber (12) formed by said first spherical dome (11).
04)-Capacitive sensor according to Claim 3, characterized in that said first spherical dome (11) and said second spherical dome (21) have their vertices (V10, V20) aligned with respect to the axis (Y) of the capacitive sensor, in such a way that the inner surface (13) of the first spherical dome (11) and the outer surface (22) of the second spherical dome (21) are spaced apart equally from each other.
05)-Capacitive sensor according to Claim 1 or 2, characterized in that said field sensor (120) is shaped in the form of a spherical segment (121) placed inside the first screened chamber (12) formed by said first spherical dome (11).
06)-Capacitive sensor according to Claim 5, characterized in that said first spherical dome (11) and said spherical segment (121) have their vertices (V10, V120) aligned with respect to the longitudinal axis (Y) of the capacitive sensor, in such a way that the inner surface (13) of the first spherical dome (11) and the outer surface (122) of the spherical segment (121) are spaced apart equally (D1) from each other.
07)-Capacitive sensor according to Claim 1 or 2, characterized in that said field sensor (220) is shaped in the form of a circular plate (221) placed inside the screened chamber (12) formed by said first spherical dome (11).
08)-Capacitive sensor according to any one of the preceding claims, characterized in that it additionally comprises a tubular screen element (50) extending axialiy along its own longitudinal axis (Y50) which is positioned coaxially with respect to the longitudinal axis (Y) of the capacitive sensor and in that said screen element (50) has a proximal portion (51) placed inside said first screened chamber (12). 09)-Capacitive sensor according to any one of the preceding claims, characterized in that it additionally comprises a screen element (50), in that said screen element (50) has a third screened chamber (53), and in that the electronic circuit (40) for treating the signal generated by the electrical field sensor (20, 120, 220) is placed inside said third screened chamber (53). 10)-Capacitive sensor according to Claim 08 or 09, characterized in that said screened element (50) also has a screened duct (54) and in that a cable (30) connecting the sensor (20, 120, 220) to the electronic signal treatment circuit (40) is placed inside said screened duct (54).
11)-Capacitive sensor according to Claim 10, characterized in that said screened duct (54) puts the first chamber (12) into communication with a chamber (53) formed by said screen element (50).
12)-Capacitive sensor according to any one of the preceding claims, characterized in that said source electrode (10) in the form of a first spherical dome (11) is formed from a sheet of conductive material. 13)-Capacitive sensor according to any one of the preceding claims, characterized in that said source electrode (10) in the form of a first spherical dome (11) is formed from a mesh of conductive material.
14)-Capacitive sensor according to any one of the preceding claims and substantially as described and illustrated in the figures of the appended drawings and for the purposes specified above.
15)-Capacitive sensor according to any one of the preceding claims, characterized in that said first spherical dome (11) is made from a metallic mesh.
16)-Capacitive sensor according to any one of the preceding claims, characterized in that said second spherical dome (21) is made from a metallic mesh.
17)-Capacitive sensor according to any one of the preceding claims, characterized in that said tubular screen element (50) is made from metallic mesh.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITBO20080393 ITBO20080393A1 (en) | 2008-06-20 | 2008-06-20 | CAPACITIVE SENSOR TO DETECT AN ELECTRIC FIELD GENERATED BY A CONDUCTOR |
| ITBO2008A000393 | 2008-06-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2009153824A1 true WO2009153824A1 (en) | 2009-12-23 |
Family
ID=40301582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IT2009/000264 WO2009153824A1 (en) | 2008-06-20 | 2009-06-17 | Capacitive sensor to sense an electric field generated by a conductor |
Country Status (2)
| Country | Link |
|---|---|
| IT (1) | ITBO20080393A1 (en) |
| WO (1) | WO2009153824A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2857848A1 (en) * | 2013-10-01 | 2015-04-08 | Sécheron SA | Capacitive voltage measuring apparatus |
| IT201700115489A1 (en) * | 2017-10-13 | 2019-04-13 | Green Seas Ventures Ltd | CONSTRUCTIVE SYSTEM AFFIRMING A CAPACITIVE VOLTAGE SENSOR |
| WO2019073497A1 (en) * | 2017-10-13 | 2019-04-18 | Alberto Bauer | Constructive system regarding a capacitive sensor |
| US11644484B2 (en) | 2018-12-17 | 2023-05-09 | G & W Electric Company | Electrical sensor assembly |
| US11740261B2 (en) | 2016-10-14 | 2023-08-29 | G & W Electric Company | Capacitive voltage sensor assembly |
| US11774481B2 (en) | 2018-12-17 | 2023-10-03 | G & W Electric Company | Electrical sensor assembly |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE764689C (en) * | 1938-10-27 | 1954-05-10 | Koch & Sterzel A G | High voltage capacitor for measuring purposes |
| DE1514703A1 (en) * | 1966-03-12 | 1969-08-28 | Sachsenwerk Licht & Kraft Ag | Control capacitor |
| US4328461A (en) * | 1979-07-02 | 1982-05-04 | Mcdonnell Douglas Corporation | Apparatus for and method of measuring a high voltage electric field |
| EP0134541A1 (en) * | 1983-08-17 | 1985-03-20 | Siemens Aktiengesellschaft | Supporting insulator for high voltage |
| WO1998005974A1 (en) * | 1996-07-15 | 1998-02-12 | Asea Brown Boveri Ab | Method, device and sensor for capacitive detecting of field and voltage and use thereof |
| DE19855528A1 (en) * | 1998-12-02 | 2000-06-21 | Ritz Messwandler Kg | Capacitative voltage divider for voltage measurements at high and medium voltage assemblies has an insulated primary electrode working with an insulated pick-up electrode and a measurement connector |
-
2008
- 2008-06-20 IT ITBO20080393 patent/ITBO20080393A1/en unknown
-
2009
- 2009-06-17 WO PCT/IT2009/000264 patent/WO2009153824A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE764689C (en) * | 1938-10-27 | 1954-05-10 | Koch & Sterzel A G | High voltage capacitor for measuring purposes |
| DE1514703A1 (en) * | 1966-03-12 | 1969-08-28 | Sachsenwerk Licht & Kraft Ag | Control capacitor |
| US4328461A (en) * | 1979-07-02 | 1982-05-04 | Mcdonnell Douglas Corporation | Apparatus for and method of measuring a high voltage electric field |
| EP0134541A1 (en) * | 1983-08-17 | 1985-03-20 | Siemens Aktiengesellschaft | Supporting insulator for high voltage |
| WO1998005974A1 (en) * | 1996-07-15 | 1998-02-12 | Asea Brown Boveri Ab | Method, device and sensor for capacitive detecting of field and voltage and use thereof |
| DE19855528A1 (en) * | 1998-12-02 | 2000-06-21 | Ritz Messwandler Kg | Capacitative voltage divider for voltage measurements at high and medium voltage assemblies has an insulated primary electrode working with an insulated pick-up electrode and a measurement connector |
Non-Patent Citations (1)
| Title |
|---|
| ADOLF J SCHWAB ET AL: "Precision Capacitive Voltage Divider for Impulse Voltagge Measurements", IEEE TRANSACTIONS ON POWER APPARATUS AND SYSTEMS, IEEE INC. NEW YORK, US, vol. 82, no. 6, 1 November 1972 (1972-11-01), pages 2376 - 2382, XP011161025, ISSN: 0018-9510 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2857848A1 (en) * | 2013-10-01 | 2015-04-08 | Sécheron SA | Capacitive voltage measuring apparatus |
| WO2015049604A1 (en) * | 2013-10-01 | 2015-04-09 | Sécheron Sa | Capacitive-type measuring apparatus |
| US11740261B2 (en) | 2016-10-14 | 2023-08-29 | G & W Electric Company | Capacitive voltage sensor assembly |
| IT201700115489A1 (en) * | 2017-10-13 | 2019-04-13 | Green Seas Ventures Ltd | CONSTRUCTIVE SYSTEM AFFIRMING A CAPACITIVE VOLTAGE SENSOR |
| WO2019073497A1 (en) * | 2017-10-13 | 2019-04-18 | Alberto Bauer | Constructive system regarding a capacitive sensor |
| US11644484B2 (en) | 2018-12-17 | 2023-05-09 | G & W Electric Company | Electrical sensor assembly |
| US11774481B2 (en) | 2018-12-17 | 2023-10-03 | G & W Electric Company | Electrical sensor assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| ITBO20080393A1 (en) | 2009-12-21 |
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