DE19941169A1 - Arrangement for detecting and evaluating current in conductor has core that contains sensor of current-induced magnetic field so as to act as screen for sensor against external magnetic fields - Google Patents
Arrangement for detecting and evaluating current in conductor has core that contains sensor of current-induced magnetic field so as to act as screen for sensor against external magnetic fieldsInfo
- Publication number
- DE19941169A1 DE19941169A1 DE1999141169 DE19941169A DE19941169A1 DE 19941169 A1 DE19941169 A1 DE 19941169A1 DE 1999141169 DE1999141169 DE 1999141169 DE 19941169 A DE19941169 A DE 19941169A DE 19941169 A1 DE19941169 A1 DE 19941169A1
- Authority
- DE
- Germany
- Prior art keywords
- sensor
- current
- core
- conductor
- detecting
- 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.)
- Withdrawn
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
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/207—Constructional details independent of the type of device used
-
- 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
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
Description
Bei der Erfindung wird ausgegangen von einer Vorrichtung zum Erfassen und Auswerten eines Stromes gemäss dem Oberbegriff von Patentanspruch 1. Eine solche Vorrichtung wird in Überstromschutzschaltern zum Schutz von unter Niederspannung stehender Leitungen, Motoren, Apparaten und Anlagen vor den Folgen von Überlastströmen verwendet.The invention is based on a device for detecting and Evaluating a current according to the preamble of claim 1. A such device is used in overcurrent protection switches to protect from Low voltage standing lines, motors, apparatus and systems in front of the Sequences of overload currents used.
Ein strombegrenzender Schalter mit einem elektronischen Überlastungsschutz ist in DE 197 21 591 A1 beschrieben. Die Elektronik zur Auswertung des Messwerts benötigt keine zusätzliche Speisequelle, da durch einen Stromwandler sichergestellt ist, dass die von der Elektronik bei Bedarf benötigte Energie aus dem zu begrenzenden Strom entnommen werden kann. Als Sensor zur Erfassung des Stromes wird eine Rogoswki-Spule, ein magnetfeldabhängiger Widerstand oder ein Hallelement eingesetzt.A current limiting switch with an electronic overload protection is in DE 197 21 591 A1. The electronics for evaluating the measured value does not require an additional power source, as it is ensured by a current transformer is that the energy required by the electronics from the to limiting current can be taken. As a sensor for detecting the A Rogoswki coil, a magnetic field-dependent resistor or a current Hall element used.
Wird ein magnetfeldabhängiger Sensor zur Erfassung des Stromes verwendet, muss besonders auf dessen Abschirmung gegen fremde Magnetfelder geachtet werden. If a magnetic field-dependent sensor is used to record the current, must special attention should be paid to shielding it against external magnetic fields.
Diesem Problem kann mit geeigneten, hochpermeablen magnetischen Abschirmungen entgegengetreten werden. Allerdings beanspruchen solche Abschirmungen in Form zylinderförmiger Magnetkörper wertvollen Platz und verursachen zudem eine Kostensteigerung.This problem can be solved with suitable, highly permeable magnetic Shields are opposed. However, such claims Shields in the form of cylindrical magnetic bodies take up valuable space and also cause an increase in costs.
Der Erfindung, wie sie im Patentanspruch 1 angegeben ist, liegt die Aufgabe zugrunde, eine Vorrichtung zum Erfassen und Auswerten eines Stromes in einem Leiter zu schaffen, deren Platzbedarf gegenüber herkömmlichen Anordnungen reduziert ist.The object of the invention is as set out in claim 1 based on a device for detecting and evaluating a current in one To create ladder, the space required compared to conventional arrangements is reduced.
In der erfindungsgemässen Vorrichtung zum Erfassen und Auswerten eines Stromes in einem Leiter umfasst ein hochpermeabler, ringförmiger Kern eines Stromwandlers einen das Magnetfeld des Stromes erfassenden Sensor. Der Kern schirmt den Sensor gegenüber fremden Magnetfeldern ab. Dadurch kann auf die Verwendung einer zusätzlichen Abschirmung des Sensors verzichtet werden. In einer besonders vorteilhaften Ausführungsform überragt der Kern den Sensor in Richtung des Leiters beidseits. Somit liegt der Sensor vollständig im Innern des Kerns, wodurch eine besonders günstige Abschirmwirkung erzielt wird.In the device according to the invention for detecting and evaluating a current in a conductor comprises a highly permeable, ring-shaped core of a current transformer a sensor detecting the magnetic field of the current. The core shields the Sensor against external magnetic fields. This can be used additional shielding of the sensor can be dispensed with. In one particularly advantageous embodiment, the core projects beyond the sensor in the direction of the conductor on both sides. Thus, the sensor is completely inside the core, creating a particularly favorable shielding effect is achieved.
Auf diese Weise kann der Platzbedarf der Vorrichtung zum Erfassen und Auswerten eines Stromes in einem Leiter nach der Erfindung gegenüber herkömmlichen Anordnungen reduziert werden.In this way, the space required by the device for recording and evaluating a current in a conductor according to the invention compared to conventional Orders are reduced.
Bevorzugte Ausführungsbeispiele der Erfindung und die damit erzielbaren weiteren Vorteile werden nachfolgend anhand von einer Zeichnungen näher erläutert. Hierbei zeigt:Preferred embodiments of the invention and the others achievable therewith Advantages are explained in more detail below with the aid of drawings. Here shows:
Fig. 1 eine Ansicht der erfindungsgemässen Vorrichtung zum Erfassen und Auswerten eines Stromes mit integrierter magnetischer Abschirmung, Fig. 1 is a view of the inventive device for detecting and evaluating a stream with integrated magnetic shield,
Fig. 2 eine Aufsicht auf einen Querschnitt durch ein Stromwandlerspule der Vorrichtung nach Fig. 1 mit einem Kern, mit äusserem Querstörfeld, Fig. 2 is a plan view of a cross section through a current transformer coil of the device according to Fig. 1 with a core, with outer Querstörfeld,
Fig. 3 eine Aufsicht auf einen Längsschnitt durch eine Stromwandlerspule der Vorrichtung nach Fig. 1 mit einem Kern, mit äusserem Längsstörfeld, Fig. 3 is a plan view of a longitudinal section through a current transformer coil of the device according to Fig. 1 with a core, with outer Längsstörfeld,
Fig. 4 ein Diagramm mit dem Feldverlauf des äusseren Querstörfelds nach Fig. 2 im Innern des Kerns der Stromwandlerspule, Fig. 4 is a diagram showing the field profile of the outer Querstörfelds of FIG. 2 in the interior of the core of the current transformer coil,
Fig. 5 ein Diagramm mit dem Feldverlauf des äusseren Längsstörfelds nach Fig. 3 im Innern der Kerns der Stromwandlerspule, und Fig. 5 is a diagram showing the field profile of the outer Längsstörfelds of FIG. 3 in the interior of the core of the current transformer coil, and
Fig. 6 ein Diagramm mit der Abschirmwirkung des Kerns der Stromwandlerspule in Funktion des Verhältnisses der Länge zum Innendurchmesser des Kerns der Stromwandlerspule der Vorrichtung nach Fig. 1 für verschiedene Frequenzen des Stromes. Fig. 6 is a diagram showing the shielding effect of the core of the current transformer coil in function of the ratio of the length to the inner diameter of the core of the current transformer coil of the device according to Fig. 1 for different frequencies of the current.
In allen Figuren bezeichnen gleiche Bezugszeichen auch gleichwirkende Teile.In all figures, the same reference symbols also designate parts with the same effect.
Fig. 1 zeigt eine Ansicht der Vorrichtung gemäss der Erfindung. An einem geraden, stromdurchflossenen Leiterabschnitt 1a eines elektrischen Leiters 1 ist ein Sensor 3 entweder aufgeklebt oder mittels einer nichtmagnetischen, nichtleitenden Halterung 11 angebracht. Er misst das vom Strom im Leiterabschnitt 1a erzeugte magnetische Feld 7 und gibt die Messwerte an die Auswertelektronik 4 weiter. Die Auswertelektronik 4 wird von einer Stromwandlerspule 2 mit Energie versorgt. Die Stromwandlerspule 2 besteht aus einem hochpermeablen Kern 5 (Ringbandkern, Schnittbandkern, etc.) und einer zu dem Leiterabschnitt 1 parallelen Wicklung 6 deren Anschlüsse mit der Auswertelektronik 4 verbunden sind. Fig. 1 shows a view of the device according to the invention. A sensor 3 is either glued to a straight, current-carrying conductor section 1 a of an electrical conductor 1 or attached by means of a non-magnetic, non-conductive holder 11 . It measures the magnetic field 7 generated by the current in the conductor section 1 a and forwards the measured values to the evaluation electronics 4 . The evaluation electronics 4 is supplied with energy by a current transformer coil 2 . The current transformer coil 2 consists of a highly permeable core 5 (ring band core, cutting band core, etc.) and a winding 6 parallel to the conductor section 1, the connections of which are connected to the evaluation electronics 4 .
Der Kern 5 umschliesst gemäss Fig. 2 den Leiterabschnitt 1 und den Stromsensor 3. Aus Fig. 3 geht hervor, dass der Kern in Richtung des Leiterabschnitts den Stromsensor 3 beidseitig überragt. Damit schirmt der Kern 5 den Stromsensor 3 gegenüber fremden Störfelder 9 und 10 ab. The core 5 encloses the conductor section 1 and the current sensor 3 according to FIG. 2. From Fig. 3 it can be seen that the core projects beyond both sides of the current sensor 3 in the direction of the conductor portion. The core 5 thus shields the current sensor 3 from external interference fields 9 and 10 .
Die Abschirmwirkung, die das Verhältnis von Feldstärke ausserhalb des Kerns zur Feldstärke im abgeschirmten Raum wiedergibt, ist durch die geometrischen Verhältnisse und die Materialwahl des Kerns gegeben.The shielding effect, which is the ratio of field strength outside the core to the Field strength in the shielded room is due to the geometric Relationships and the choice of materials for the core.
Fig. 4 und Fig. 5 zeigen den Feldverlauf im Innern des Kerns für zwei technisch wichtige Fälle, ein abzuschirmendes Quer- und Längsstörfeld 9 und 10 bei 50 Hz. Wird als Stromsensor 3 ein Hallsensor verwendet, sind Längsstörfelder unproblematisch, da der Hallsensor in der Vorrichtung nach der Erfindung nur auf Querstörfelder sensitiv ist. Aus Fig. 4 ist ersichtlich, dass der Stromsensor 3 im Vergleich zur Länge L des Kerns 5 möglichst kurz sein sollte, da die Abschirmwirkung des Kerns gegen die Mitte zunimmt. FIGS. 4 and Fig. 5 show the field distribution inside the core for two technically important cases, a be shielded transverse and Längsstörfeld 9 and 10 at 50 Hz. If a Hall sensor is used as a current sensor 3, Längsstörfelder are not problematic, since the Hall sensor in the Device according to the invention is only sensitive to interference fields. From Fig. 4 it is apparent that the current sensor 3 compared to the length L of the core 5 should be as short as possible, because the shielding effect of the core towards the center increases.
Zusammen mit der in Fig. 6 dargestellten Abschirmwirkung des Kerns in Funktion des Verhältnisses Länge zu Innendurchmesser L/Di wird ersichtlich, dass in einer vorteilhaften Ausführung das Verhältnis Länge zu Innendurchmesser L/Di des Kerns möglichst gross ist. Das Verhältnisses Länge zu Innendurchmesser L/Di sollte als untere Grenze 0.5 nicht unterschreiten. Für diesen Grenzwert ergibt sich gemäss Fig. 6 für ein Querstörfeld 9 mit einer Frequenz von maximal 50 Hz immer noch ein Abschirmfaktor von 8-10. Ein besonders vorteilhaftes Verhältnis Länge zu Innendurchmesser L/Di ist 1, mit einem Abschirmfaktor im Bereich von 30-50.Together with the shielding effect of the core shown in FIG. 6 as a function of the ratio length to inside diameter L / D i , it can be seen that in an advantageous embodiment the ratio length to inside diameter L / D i of the core is as large as possible. The ratio length to inner diameter L / D i should not fall below 0.5 as the lower limit. For this limit value is shown in FIG. 6 still a shielding factor of 8-10 is obtained for a Querstörfeld 9 with a maximum frequency of 50 Hz. A particularly advantageous ratio of length to inner diameter L / D i is 1, with a shielding factor in the range of 30-50.
In einer vorteilhaften Ausführung der Erfindung dient die Vorrichtung der Überwachung eines Stromes in einem Überstromschutzschalter (ISS). Die Auswertelektronik steuert dabei einen Schalter 8, der den Strom im Leiter 1 ausschalten kann.In an advantageous embodiment of the invention, the device is used to monitor a current in an overcurrent protection switch (ISS). The evaluation electronics controls a switch 8 , which can switch off the current in conductor 1 .
Typische Dimensionen für Innendurchmesser D1, Aussendurchmesser und Länge L von in ISS verwendeten zylinderrohrförmigen Stromwandlerspulen mit einem hochpermeablen Kern sind 10 × 17 × 5 mm (L/Di = 0.5). Typical dimensions for inner diameter D1, outer diameter and length L of cylindrical tubular current transformer coils used in ISS with a highly permeable core are 10 × 17 × 5 mm (L / D i = 0.5).
11
Primärleiter
Primary conductor
11
a gerader Leiterabschnitt
a straight ladder section
22nd
Stromwandlerspule
Current transformer coil
33rd
Stromsensor
Current sensor
44th
Auswertelektronik
Evaluation electronics
55
Hochpermeabler Kern
Highly permeable core
66
Wicklung der Spule
Winding the coil
77
Magnetfeld im Innern des Kerns
Magnetic field inside the core
88th
Gesteuerter Schalter
Controlled switch
99
Querstörfeld
Cross interference field
1010th
Längsstörfeld
Longitudinal interference field
1111
Halterung für Stromsensor
L Länge des Kerns
Di Bracket for current sensor
L length of the core
D i
Innendurchmesser des Kerns
Inner diameter of the core
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999141169 DE19941169A1 (en) | 1999-08-30 | 1999-08-30 | Arrangement for detecting and evaluating current in conductor has core that contains sensor of current-induced magnetic field so as to act as screen for sensor against external magnetic fields |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999141169 DE19941169A1 (en) | 1999-08-30 | 1999-08-30 | Arrangement for detecting and evaluating current in conductor has core that contains sensor of current-induced magnetic field so as to act as screen for sensor against external magnetic fields |
Publications (1)
Publication Number | Publication Date |
---|---|
DE19941169A1 true DE19941169A1 (en) | 2001-03-01 |
Family
ID=7920127
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE1999141169 Withdrawn DE19941169A1 (en) | 1999-08-30 | 1999-08-30 | Arrangement for detecting and evaluating current in conductor has core that contains sensor of current-induced magnetic field so as to act as screen for sensor against external magnetic fields |
Country Status (1)
Country | Link |
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DE (1) | DE19941169A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011080039A1 (en) * | 2011-07-28 | 2013-04-18 | Vacuumschmelze Gmbh & Co. Kg | Flow sensor assembly |
WO2016166050A1 (en) * | 2015-04-14 | 2016-10-20 | Omicron Electronics Gmbh | Transformer, testing apparatus, and method for testing a test object of an item of energy equipment |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2712064A1 (en) * | 1977-03-15 | 1978-09-21 | Siemens Ag | CURRENT MEASURING DEVICE |
DE2829949C2 (en) * | 1978-07-06 | 1982-11-11 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Arrangement for potential-free measurement of a direct current subject to harmonics in high-voltage systems |
CH659138A5 (en) * | 1982-10-27 | 1986-12-31 | Landis & Gyr Ag | Arrangement for measuring the current flowing in an electrical conductor via the magnetic field generated by it |
US4728887A (en) * | 1984-06-22 | 1988-03-01 | Davis Murray W | System for rating electric power transmission lines and equipment |
EP0139068B1 (en) * | 1983-08-31 | 1988-03-30 | Hydro-Quebec | An apparatus for sensing and measuring a current on a power transmission line |
GB2205963A (en) * | 1987-06-06 | 1988-12-21 | Brush Switchgear | Measuring current |
US5055771A (en) * | 1989-08-21 | 1991-10-08 | Sigma Instruments, Inc. | Faulted current indicators with improved signal to noise ratios |
EP0578948A1 (en) * | 1992-07-14 | 1994-01-19 | Landis & Gyr Technology Innovation AG | Arrangement for measuring power or current components of an impedance |
US5828282A (en) * | 1996-12-13 | 1998-10-27 | General Electric Company | Apparatus and method for shielding a toroidal current sensor |
-
1999
- 1999-08-30 DE DE1999141169 patent/DE19941169A1/en not_active Withdrawn
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2712064A1 (en) * | 1977-03-15 | 1978-09-21 | Siemens Ag | CURRENT MEASURING DEVICE |
DE2829949C2 (en) * | 1978-07-06 | 1982-11-11 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Arrangement for potential-free measurement of a direct current subject to harmonics in high-voltage systems |
CH659138A5 (en) * | 1982-10-27 | 1986-12-31 | Landis & Gyr Ag | Arrangement for measuring the current flowing in an electrical conductor via the magnetic field generated by it |
EP0139068B1 (en) * | 1983-08-31 | 1988-03-30 | Hydro-Quebec | An apparatus for sensing and measuring a current on a power transmission line |
US4728887A (en) * | 1984-06-22 | 1988-03-01 | Davis Murray W | System for rating electric power transmission lines and equipment |
GB2205963A (en) * | 1987-06-06 | 1988-12-21 | Brush Switchgear | Measuring current |
US5055771A (en) * | 1989-08-21 | 1991-10-08 | Sigma Instruments, Inc. | Faulted current indicators with improved signal to noise ratios |
EP0578948A1 (en) * | 1992-07-14 | 1994-01-19 | Landis & Gyr Technology Innovation AG | Arrangement for measuring power or current components of an impedance |
US5828282A (en) * | 1996-12-13 | 1998-10-27 | General Electric Company | Apparatus and method for shielding a toroidal current sensor |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011080039A1 (en) * | 2011-07-28 | 2013-04-18 | Vacuumschmelze Gmbh & Co. Kg | Flow sensor assembly |
US8941373B2 (en) | 2011-07-28 | 2015-01-27 | Vacuumschmelze Gmbh & Co. Kg | Current sensor arrangement |
WO2016166050A1 (en) * | 2015-04-14 | 2016-10-20 | Omicron Electronics Gmbh | Transformer, testing apparatus, and method for testing a test object of an item of energy equipment |
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Representative=s name: ZIMMERMANN & PARTNER, 80331 MUENCHEN |
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8139 | Disposal/non-payment of the annual fee |