WO2013026423A1 - Combined measuring and detecting system - Google Patents

Combined measuring and detecting system Download PDF

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Publication number
WO2013026423A1
WO2013026423A1 PCT/CZ2012/000075 CZ2012000075W WO2013026423A1 WO 2013026423 A1 WO2013026423 A1 WO 2013026423A1 CZ 2012000075 W CZ2012000075 W CZ 2012000075W WO 2013026423 A1 WO2013026423 A1 WO 2013026423A1
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WO
WIPO (PCT)
Prior art keywords
primary conductor
electric current
conductive electrode
electric voltage
sensor
Prior art date
Application number
PCT/CZ2012/000075
Other languages
French (fr)
Inventor
Rarek JAVORA
Petr VELESIK
Original Assignee
Abb Technology Ag
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Publication of WO2013026423A1 publication Critical patent/WO2013026423A1/en

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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
    • G01R15/142—Arrangements for simultaneous measurements of several parameters employing techniques covered by groups G01R15/14 - G01R15/26
    • 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
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers

Definitions

  • the technical solution refers to a combined measuring and detecting system on an electric conductor including at least one sensor of electric current having a shape of a ring around the electric conductor and/or at least one sensor of electric voltage having a shape of a ring around the electric conductor.
  • measuring transformers or any other detecting elements Construction of measuring transformers or any other detecting elements is usually designed so that it may suit to a given solution. In case that the measuring
  • transformer is designed for one application, it is capable of meeting limiting values of a withstand voltage for this application.
  • the withstand voltage value may not any longer meet appropriate requirements and therefore it may be difficult to use such a measuring transformer on given unfavourable conditions.
  • electric fields from surroundings can have an influence on measured values and in such way to influence measurement accuracy.
  • measuring transformers As currently a construction of measuring transformers is designed for a specified application, it is necessary, provided that the measuring transformer is to be used for a different application, to perform dielectric tests to find out whether dielectric resistance of the whole assembly is sufficient. If it is found out that it is not the case, it is necessary to design external apparatuses, special arrangement or additional insulation in order to reach a sufficient dielectric resistance of the whole assembly.
  • Various solutions for the same measuring transformer in various applications can be necessary to meet the same requirements.
  • a combined measuring and detecting system on a primary conductor including at least one sensor of electric current having a shape of a ring around the primary conductor and/or at least one sensor of electric voltage having a shape of a ring around the primary conductor.
  • the substance of the technical solution is that a space between the electric current sensor and/or the electric voltage sensor and the primary conductor is at least from one side separated from surrounding area by a conductive electrode having a shape of a ring around the primary conductor.
  • this combined measuring and detecting system includes both the electric current sensor and the electric voltage sensor.
  • the ring of the conductive electrode has an inner circular edge and an outer circular edge, and the conductive electrode surface between the inner and the outer circular edges forms an angle ranging from 60° to 120° with an axis of the primary conductor.
  • the conductive electrode is adjacent by its inner circular edge to the primary conductor and is conductively connected to it, and its outer circular edge is farther from the primary conductor surface than the inner side of the electric current sensor.
  • the electric voltage sensor is arranged between the primary conductor and the electric current sensor in order to shield the electric voltage sensor from external influences.
  • the conductive electrode at its outer circular edge is bent in the direction outwards from the electric current and electric voltage sensors or rolled into a hem having a circular cross-section.
  • the combined measuring and detecting system includes both the electric current sensor and the electric voltage sensor.
  • the ring of the conductive electrode has an inner circular edge and an outer circular edge, and the conductive electrode surface between the inner and the outer circular edges forms an angle ranging from 60° to 120° with an axis of the primary conductor.
  • the conductive electrode is attached by its outer circular edge to the electric current sensor and is earthed and the electric voltage sensor is arranged between the primary conductor and the electric current sensor in order to shield the electric voltage sensor from external influences.
  • the conductive electrode at its inner circular edge in a distance from the primary conductor surface is bent in the direction towards the electric current and electric voltage sensors or rolled into a hem having a circular cross-section.
  • Another advantageous embodiment of the combined measuring and detecting system includes both the electric current sensor and the electric voltage sensor. It is likewise true that the ring of the conductive electrode has the inner circular edge and the outer circular edge, and the conductive electrode surface between the inner and the outer circular edges forms an angle ranging from 60° to 120° with the axis of the primary conductor.
  • the conductive electrode is on a floating potential and the electric voltage sensor is arranged between the primary conductor and the electric current meter in order to shield the electric voltage sensor from external influences.
  • the conductive electrode at its inner circular edge in a distance from the primary conductor surface is bent in the direction to the electric current and electric voltage sensors or rolled into a hem having a circular cross- section.
  • the conductive electrodes in the combined measuring and detecting system are arranged at both sides of the area between the electric current and the electric voltage sensors and the primary conductor.
  • the electric current sensor is implemented as a current transformer or as a low-performance current sensor.
  • the electric voltage sensor is implemented as a capacitance divider and/or a resistor divider.
  • the curvature radius of the bent or rolled end of the conductive electrode is greater than 1 mm.
  • the inner radius of the conductive electrode ring is smaller than the distance of the ring-shaped voltage sensor from the axis of the primary conductor.
  • the electric voltage and electric current sensors assembly with the conductive electrodes are embedded in an insulating material, whereas the distance of the electric voltage and electric current sensors as well as the conductive electrodes from the insulating material surface is greater than 1 mm.
  • the combined measuring and detecting system includes a temperature sensor in addition to the electric current sensor or electric voltage sensor.
  • Fig. 1 is a partial cross-section of the combined measuring and detecting system with the conductive electrode connected conductively to the primary conductor
  • Fig. 2 is a partial cross-section of the combined measuring and detecting system with the conductive electrode connected to the electric current sensor.
  • the first exemplary embodiment of the combined measuring and detecting system 1 on the primary conductor 3 is depicted in Fig. 1.
  • This combined measuring and detecting system 1 includes the electric current sensor 2 in the shape of the ring around the primary conductor 3 and the electric voltage sensor 6 in the shape of the ring around the primary conductor 3.
  • Two conductive electrodes 4 in the shape of the ring around the primary conductor 3 are connected conductively to the primary conductor 3, the conductive electrodes 4 separating the space between the electric current sensor 2 and the electric voltage sensor 6 from surrounding area. Specific resistance of the conductive electrodes 4 material can tend to zero but it can reach up to tens or hundreds of kQ.
  • the ring of the conductive electrode 4 has the inner circular edge 7 and the outer circular edge 8 and the area of the conductive electrode 4 between the inner and the outer circular edges 7 and 8 forms an angle of 90° with the axis 9 of the primary conductor 3.
  • the conductive electrode 4 can incline even at another angle, i. g. angle ranging between 60° to 120°, and thus create a lateral area of a truncated cone if it meets the requirement to shield the electric voltage sensor 6 from perturbative influences, especially from the direction parallel with the axis 9 of the primary conductor 3. Owing to easy assembling it is better if the surface of the conductive electrode 4 is perpendicular to the axis 9 of the primary conductor 3.
  • the conductive electrode 4 is adjacent by its inner circular edge 7 to the primary conductor 3 and is conductively connected to it, and the outer circular edge 8 of the conductive electrode 4 is farther from the primary conductor 3 surface than the inner side of the sensor 2 of electric current.
  • the electric voltage sensor 6 is arranged between the primary conductor 3 and the electric current sensor 2 in order to shield the electric voltage sensor 2 from external influences.
  • the conductive electrode 4 is bent at its outer circular edge 8 in the direction from the electric current and electric voltage sensors 2 and 6, respectively.
  • the conductive electrode 4 at its outer circular edge 8 can be rolled into a hem of a circular cross-section so that the arrangement is created in which the possibility of dielectric discharges from the outer circular edge 8 of the conductive electrode 4 is minimised.
  • both the bending and the rolling of the conductive electrode 4 at its outer circular edge 8 have a radius R of a curvature greater than 1 mm.
  • the electric voltage sensor 6 is arranged between the electric current sensor 2 and the primary conductor 3 so that it is shielded from perturbative influences from outside by the ring-shaped electric current sensor 2. Besides it is shielded even by the conductive electrodes 4 from both sides in the direction parallel to the axis 9 of the primary conductor 3.
  • the outer radius B of the ring-shaped conductive electrode 4 is greater than the inner radius A of the ring-shaped electric current sensor 2.
  • the complete combined measuring and detecting system 1 is imbedded in a block 10 of an insulating material 5, at best of a permitivity greater than , whereas both the distance D of the electric current sensor 2 from the block 10 surface and the distance E of the conductive electrode 4 from the block 10 surface are greater than 1 mm. Also the radius S of the electric voltage sensor 6 is greater than 1 mm.
  • the second exemplary embodiment of the combined measuring and detecting system 1 on the primary conductor 3 is depicted in Fig. 2.
  • This embodiment differs from the first one in that the conductive electrodes 4 are connected to the electric current sensor 2 and thus they are not on the voltage of the primary conductor 3.
  • the conductive electrodes 4 can be either earthed together with the electric current sensor 2 or they can be on another or floating voltage together with the electric current sensor 2.
  • the conductive electrodes 4 are ring-shaped and have the bent or rolled part on their inner edges, which are at a distance C from the primary conductor 3 surface.
  • the electric voltage sensor 6 is arranged between the electric current sensor 2 and the primary conductor 3 so that it is shielded from perturbative influences from outside by the ring-shaped electric current sensor 2.
  • the complete combined measuring and detecting system 1 is imbedded in the block 10 of the insulating material 5, whereas both the distance D of the electric current sensor 2 from the block 0 surface and the distance E of the conductive electrode 4 from the block 10 surface are greater than 1 mm. Even in this case the radius S of the electric voltage sensor 6 is greater than 1 mm.
  • the combined measuring and detecting system 1 arranged on the primary conductor 3 measures voltage and current of this primary conductor 3.
  • the conductive electrodes 4 keep a constant voltage, namely either a voltage identical with the voltage on the primary conductor 3 as in the first exemplary embodiment, or a zero voltage or floating voltage as in the second exemplary embodiment, what causes a favourable behaviour of electric field between them.
  • the electric voltage sensor 6, which is arranged between them, is thus in a homogenous electric field that is not influenced by the shielded external influences, all the more so, that the electric voltage sensor 6 is shielded from the side perpendicular to the axis 9 of the primary conductor 3 by the electric current sensor 2.
  • the voltage measuring is stabilized by this arrangement and is not subject to accidental deviations and interferences caused by various applications, which increases its accuracy, reliability and applicability.
  • the combined measuring and detecting system according to the technical solution can be advantageously used for measuring of electric current and voltage in heavy current electrical engineering, e.g. for switchboards.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

The combined measuring and detecting system (1) on a primary conductor (3) includes at least one electric current sensor (2) in a shape of a ring around the primary conductor (3) and/or an electric voltage sensor (6) in a shape of a ring around the primary conductor (3). The space between the electric current and/or electric voltage sensor (2 and/or 6), respectively, and the primary conductor (3) is separated from a surrounding area at least from one side by a conductive electrode (4) in a shape of a ring around the primary conductor (3).

Description

COMBINED MEASURING AND DETECTING SYSTEM
TECHNICAL FIELD OF THE INVENTION
The technical solution refers to a combined measuring and detecting system on an electric conductor including at least one sensor of electric current having a shape of a ring around the electric conductor and/or at least one sensor of electric voltage having a shape of a ring around the electric conductor.
PRIOR ART
Construction of measuring transformers or any other detecting elements is usually designed so that it may suit to a given solution. In case that the measuring
transformer is designed for one application, it is capable of meeting limiting values of a withstand voltage for this application. In case that the same transformer is used for other applications, the withstand voltage value may not any longer meet appropriate requirements and therefore it may be difficult to use such a measuring transformer on given unfavourable conditions. In addition electric fields from surroundings can have an influence on measured values and in such way to influence measurement accuracy.
As currently a construction of measuring transformers is designed for a specified application, it is necessary, provided that the measuring transformer is to be used for a different application, to perform dielectric tests to find out whether dielectric resistance of the whole assembly is sufficient. If it is found out that it is not the case, it is necessary to design external apparatuses, special arrangement or additional insulation in order to reach a sufficient dielectric resistance of the whole assembly. Various solutions for the same measuring transformer in various applications can be necessary to meet the same requirements.
SUMMARY OF THE INVENTION
The above shortcomings of the state of the art are eliminated to a great extent by a combined measuring and detecting system on a primary conductor including at least one sensor of electric current having a shape of a ring around the primary conductor and/or at least one sensor of electric voltage having a shape of a ring around the primary conductor. The substance of the technical solution is that a space between the electric current sensor and/or the electric voltage sensor and the primary conductor is at least from one side separated from surrounding area by a conductive electrode having a shape of a ring around the primary conductor.
In an advantageous embodiment this combined measuring and detecting system includes both the electric current sensor and the electric voltage sensor. The ring of the conductive electrode has an inner circular edge and an outer circular edge, and the conductive electrode surface between the inner and the outer circular edges forms an angle ranging from 60° to 120° with an axis of the primary conductor. The conductive electrode is adjacent by its inner circular edge to the primary conductor and is conductively connected to it, and its outer circular edge is farther from the primary conductor surface than the inner side of the electric current sensor. The electric voltage sensor is arranged between the primary conductor and the electric current sensor in order to shield the electric voltage sensor from external influences. The conductive electrode at its outer circular edge is bent in the direction outwards from the electric current and electric voltage sensors or rolled into a hem having a circular cross-section.
Also in another advantageous embodiment the combined measuring and detecting system includes both the electric current sensor and the electric voltage sensor. The same way as in the preceding embodiment the ring of the conductive electrode has an inner circular edge and an outer circular edge, and the conductive electrode surface between the inner and the outer circular edges forms an angle ranging from 60° to 120° with an axis of the primary conductor. However the conductive electrode is attached by its outer circular edge to the electric current sensor and is earthed and the electric voltage sensor is arranged between the primary conductor and the electric current sensor in order to shield the electric voltage sensor from external influences. The conductive electrode at its inner circular edge in a distance from the primary conductor surface is bent in the direction towards the electric current and electric voltage sensors or rolled into a hem having a circular cross-section.
Also another advantageous embodiment of the combined measuring and detecting system includes both the electric current sensor and the electric voltage sensor. It is likewise true that the ring of the conductive electrode has the inner circular edge and the outer circular edge, and the conductive electrode surface between the inner and the outer circular edges forms an angle ranging from 60° to 120° with the axis of the primary conductor. However the conductive electrode is on a floating potential and the electric voltage sensor is arranged between the primary conductor and the electric current meter in order to shield the electric voltage sensor from external influences. Also in this case the conductive electrode at its inner circular edge in a distance from the primary conductor surface is bent in the direction to the electric current and electric voltage sensors or rolled into a hem having a circular cross- section.
In a particularly advantageous embodiment the conductive electrodes in the combined measuring and detecting system are arranged at both sides of the area between the electric current and the electric voltage sensors and the primary conductor.
In another advantageous embodiment the electric current sensor is implemented as a current transformer or as a low-performance current sensor.
In this or in another advantageous exemplary embodiment the electric voltage sensor is implemented as a capacitance divider and/or a resistor divider.
In case the conductive electrode is bent at its inner circular edge or is rolled into a hem having a circular cross-section the curvature radius of the bent or rolled end of the conductive electrode is greater than 1 mm.
In case that the conductive electrode is not connected conductively to the primary conductor, in an advantageous embodiment of the technical solution the inner radius of the conductive electrode ring is smaller than the distance of the ring-shaped voltage sensor from the axis of the primary conductor.
In such a case it is also advantageous if the electric voltage and electric current sensors assembly with the conductive electrodes are embedded in an insulating material, whereas the distance of the electric voltage and electric current sensors as well as the conductive electrodes from the insulating material surface is greater than 1 mm.
And finally in another advantageous embodiment of the technical solution the combined measuring and detecting system includes a temperature sensor in addition to the electric current sensor or electric voltage sensor. BRIEF DESCRIPTION OF THE DRAWINGS
The technical solution will be described in details hereinafter with reference to the accompanying drawings wherein:
Fig. 1 is a partial cross-section of the combined measuring and detecting system with the conductive electrode connected conductively to the primary conductor, and Fig. 2 is a partial cross-section of the combined measuring and detecting system with the conductive electrode connected to the electric current sensor.
DETAILED DESCRIPTION OF THE DRAWINGS
The first exemplary embodiment of the combined measuring and detecting system 1 on the primary conductor 3 is depicted in Fig. 1. This combined measuring and detecting system 1 includes the electric current sensor 2 in the shape of the ring around the primary conductor 3 and the electric voltage sensor 6 in the shape of the ring around the primary conductor 3. Two conductive electrodes 4 in the shape of the ring around the primary conductor 3 are connected conductively to the primary conductor 3, the conductive electrodes 4 separating the space between the electric current sensor 2 and the electric voltage sensor 6 from surrounding area. Specific resistance of the conductive electrodes 4 material can tend to zero but it can reach up to tens or hundreds of kQ.
The ring of the conductive electrode 4 has the inner circular edge 7 and the outer circular edge 8 and the area of the conductive electrode 4 between the inner and the outer circular edges 7 and 8 forms an angle of 90° with the axis 9 of the primary conductor 3. The conductive electrode 4 can incline even at another angle, i. g. angle ranging between 60° to 120°, and thus create a lateral area of a truncated cone if it meets the requirement to shield the electric voltage sensor 6 from perturbative influences, especially from the direction parallel with the axis 9 of the primary conductor 3. Owing to easy assembling it is better if the surface of the conductive electrode 4 is perpendicular to the axis 9 of the primary conductor 3. The conductive electrode 4 is adjacent by its inner circular edge 7 to the primary conductor 3 and is conductively connected to it, and the outer circular edge 8 of the conductive electrode 4 is farther from the primary conductor 3 surface than the inner side of the sensor 2 of electric current. The electric voltage sensor 6 is arranged between the primary conductor 3 and the electric current sensor 2 in order to shield the electric voltage sensor 2 from external influences. At that the conductive electrode 4 is bent at its outer circular edge 8 in the direction from the electric current and electric voltage sensors 2 and 6, respectively. However the conductive electrode 4 at its outer circular edge 8 can be rolled into a hem of a circular cross-section so that the arrangement is created in which the possibility of dielectric discharges from the outer circular edge 8 of the conductive electrode 4 is minimised. In an exemplary embodiment both the bending and the rolling of the conductive electrode 4 at its outer circular edge 8 have a radius R of a curvature greater than 1 mm.
The electric voltage sensor 6 is arranged between the electric current sensor 2 and the primary conductor 3 so that it is shielded from perturbative influences from outside by the ring-shaped electric current sensor 2. Besides it is shielded even by the conductive electrodes 4 from both sides in the direction parallel to the axis 9 of the primary conductor 3. The outer radius B of the ring-shaped conductive electrode 4 is greater than the inner radius A of the ring-shaped electric current sensor 2. The complete combined measuring and detecting system 1 is imbedded in a block 10 of an insulating material 5, at best of a permitivity greater than , whereas both the distance D of the electric current sensor 2 from the block 10 surface and the distance E of the conductive electrode 4 from the block 10 surface are greater than 1 mm. Also the radius S of the electric voltage sensor 6 is greater than 1 mm.
The second exemplary embodiment of the combined measuring and detecting system 1 on the primary conductor 3 is depicted in Fig. 2. This embodiment differs from the first one in that the conductive electrodes 4 are connected to the electric current sensor 2 and thus they are not on the voltage of the primary conductor 3. The conductive electrodes 4 can be either earthed together with the electric current sensor 2 or they can be on another or floating voltage together with the electric current sensor 2. The conductive electrodes 4 are ring-shaped and have the bent or rolled part on their inner edges, which are at a distance C from the primary conductor 3 surface. In this embodiment the electric voltage sensor 6 is arranged between the electric current sensor 2 and the primary conductor 3 so that it is shielded from perturbative influences from outside by the ring-shaped electric current sensor 2. In the same way it is also shielded from both sides in the direction parallel to the axis 9 of the primary conductor 3 by the conductive electrodes 4. In the same way as in the previous embodiment also in this case the complete combined measuring and detecting system 1 is imbedded in the block 10 of the insulating material 5, whereas both the distance D of the electric current sensor 2 from the block 0 surface and the distance E of the conductive electrode 4 from the block 10 surface are greater than 1 mm. Even in this case the radius S of the electric voltage sensor 6 is greater than 1 mm.
In operation the combined measuring and detecting system 1 arranged on the primary conductor 3 measures voltage and current of this primary conductor 3. The conductive electrodes 4 keep a constant voltage, namely either a voltage identical with the voltage on the primary conductor 3 as in the first exemplary embodiment, or a zero voltage or floating voltage as in the second exemplary embodiment, what causes a favourable behaviour of electric field between them. The electric voltage sensor 6, which is arranged between them, is thus in a homogenous electric field that is not influenced by the shielded external influences, all the more so, that the electric voltage sensor 6 is shielded from the side perpendicular to the axis 9 of the primary conductor 3 by the electric current sensor 2. The voltage measuring is stabilized by this arrangement and is not subject to accidental deviations and interferences caused by various applications, which increases its accuracy, reliability and applicability.
INDUSTRIAL APPLICABILITY
The combined measuring and detecting system according to the technical solution can be advantageously used for measuring of electric current and voltage in heavy current electrical engineering, e.g. for switchboards.

Claims

1. A combined measuring and detecting system (1) for use on a primary conductor
(3) , the system (1 ) including at least one electric current sensor (2) in the shape of a ring to be arranged around the primary conductor (3) and/or an electric voltage sensor (6) in the shape of a ring to be arranged around the primary conductor (3), characterized in that the system (1) further comprises a conductive electrode
(4) in the shape of a ring to be arranged around the primary conductor (3) for separating the space between the area for the primary conductor (3) and the electric current and/or electric voltage sensor (2 and/or 6), respectively, at least at one side from a surrounding area.
2. The combined measuring and detecting system (1) according to claim 1 ,
characterized in that it includes both the electric current sensor (2) and the electric voltage sensor (6), whereas the ring of the conductive electrode (4) has an inner circular edge (7) and an outer circular edge (8), the surface of the conductive electrode (4) between the inner and the outer circular edges (7 and 8) forms an angle with an axis of the primary conductor (3) ranging from 60° to 120°, and the conductive electrode (4) is adjacent by the inner circular edge (7) to the primary conductor (3) and is conductively connected to it, and its outer circular edge (8) is farther from the primary conductor (3) surface than the inner side of the electric current sensor (2), and the electric voltage sensor (6) is arranged between the primary conductor (3) and the electric current sensor (2) in order to shield the electric voltage sensor (6) from external influences, and whereas the conductive electrode (4) is at the outer circular edge (8) bent in the direction from the electric current and electric voltage sensors (2 and 6) or rolled into a hem having a circular cross-section.
3. The combined measuring and detecting system (1) according to claim 1 ,
characterized in that it includes both the electric current sensor (2) and the electric voltage sensor (6), whereas the ring of the conductive electrode (4) has the inner circular edge (7) and the outer circular edge (8), the surface of the conductive electrode (4) between the inner and the outer circular edges (7 and 8) forms an angle with the axis of the primary conductor (3) ranging from 60° to 120°, and the conductive electrode (4) is attached by the outer circular edge (8) to the electric current sensor (2) and is earthed, and the electric voltage sensor (6) is arranged between the primary conductor (3) and the electric current sensor (2) in order to shield the electric voltage sensor (6) from external influences, and whereas the conductive electrode (4) is at the inner circular edge at a distance from the primary conductor (3) surface bent or rolled into the hem having the circular cross-section.
4. The combined measuring and detecting system (1) according to claim 1 ,
characterized in that it includes both the electric current sensor (2) and the electric voltage sensor (6), whereas the ring of the conductive electrode (4) has the inner circular edge (7) and the outer circular edge (8), the surface of the conductive electrode (4) between the inner and the outer circular edges (7 and 8) forms an angle with the axis of the primary conductor (3) ranging from 60° to 120°, and the conductive electrode (4) is on a floating potential, and the electric voltage sensor (6) is arranged between the primary conductor (3) and the electric current sensor (2) in order to shield the electric voltage sensor (6) from external influences, and whereas the conductive electrode (4) is at the inner circular edge (7) at a distance from the primary conductor (3) surface bent or rolled into the hem having the circular cross-section.
5. The combined measuring and detecting system (1) according to claims 2 to 4, characterized in that the conductive electrodes (4) are arranged on both sides of the space between the electric current and electric voltage sensors (2 and 6), respectively, and the primary conductor (3).
6. The combined measuring and detecting system (1) according to claim 1 ,
characterized in that the electric current sensor (2) is implemented as a current transformer or as a low-performance current sensor.
7. The combined measuring and detecting system (1) according to claim 1 ,
characterized in that the electric voltage sensor (6) is implemented as capacitance divider or resistor divider.
8. The combined measuring and detecting system (1) according to claims 2 to 4, characterized in that the curvature of the bent or rolled end of the conductive electrode (4) has a radius greater than 0,1 mm.
9. The combined measuring and detecting system (1) according to claims 3 or 4, characterized in that the inner radius of the ring of the conductive electrode (4) is smaller than the distance of the ring-shaped electric voltage sensor (6) from the axis (9) of the primary conductor (3).
10. The combined measuring and detecting system (1) according to claims 3 or 4, characterized in that the set of the electric current and electric voltage sensors (2 and 6), respectively, together with the conductive electrodes (4) is imbedded in a block (10) of an insulating material (5), whereas the distance of both the electric current and electric voltage sensors (2 and 6), respectively, and the conductive electrodes (4) from the surface of the insulating material (5) is greater than 1 mm.
11. The combined measuring and detecting system (1) according to claim 1 ,
characterized in that besides the electric current sensor (2) or the electric voltage sensor (6) it includes a temperature sensor.
PCT/CZ2012/000075 2011-08-23 2012-08-08 Combined measuring and detecting system WO2013026423A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CZ201124752U CZ23097U1 (en) 2011-08-23 2011-08-23 Combined measuring and detection system
CZPUV2011-24752 2011-08-23

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EP2722678A1 (en) * 2012-10-18 2014-04-23 ABB Technology AG Current and/or voltage sensing device for integrative use
EP3051298A1 (en) 2015-02-02 2016-08-03 Schneider Electric Industries SAS Current sensor and electrical network comprising such a current sensor
US11543436B2 (en) 2018-03-30 2023-01-03 G & W Electric Company 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

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