DE2303906A1 - CURRENT MEASURING CONVERTER FOR OBTAINING A VOLTAGE PROPORTIONAL TO THE CURRENT TO BE MEASURED - Google Patents

CURRENT MEASURING CONVERTER FOR OBTAINING A VOLTAGE PROPORTIONAL TO THE CURRENT TO BE MEASURED

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Publication number
DE2303906A1
DE2303906A1 DE19732303906 DE2303906A DE2303906A1 DE 2303906 A1 DE2303906 A1 DE 2303906A1 DE 19732303906 DE19732303906 DE 19732303906 DE 2303906 A DE2303906 A DE 2303906A DE 2303906 A1 DE2303906 A1 DE 2303906A1
Authority
DE
Germany
Prior art keywords
current
measured
secondary winding
iron core
iron
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.)
Pending
Application number
DE19732303906
Other languages
German (de)
Inventor
Kurt Haenni
Michael Dipl Ing Hentschel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rockwell Automation Switzerland GmbH
Original Assignee
Sprecher und Schuh 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
Application filed by Sprecher und Schuh AG filed Critical Sprecher und Schuh AG
Publication of DE2303906A1 publication Critical patent/DE2303906A1/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • 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
    • G01R15/186—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using current transformers with a core consisting of two or more parts, e.g. clamp-on type

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Description

PatentanwältePatent attorneys

.'ν., ί.?inweber.'ν., ί.? inweber

-ι.:. ν. V/e 5:,rsky-ι.:. ν. V / e 5:, rsky

Tel. 2603389Tel. 2603389

München,- den 26. Januar 1973Munich, January 26, 1973

SPRECHER S SCHUH AG, Aarau (Schweiz)SPRECHER S SCHUH AG, Aarau (Switzerland)

Strommesswandler zur Gewinnung einer dem zu messenden Strom
proportionalen SpannungCurrent transducer for obtaining a current to be measured
proportional voltage

Die Erfindung betrifft einen Strommesswandler zur Gewinnung einer dem zu messenden Strom proportionalen Spannung, mit einem vom zu
messenden Strom durchfluteten und mit einer Sekundärwicklung ver sehenen geschlossenen Eisenkern.The invention relates to a current transducer for obtaining a voltage proportional to the current to be measured, with a voltage from to
flooded measured current and a secondary winding provided with ver closed iron core.

Für die Speisung von elektronischen Schutzschaltungen sind dem zu überwachenden Wechselstrom proportionale Spannungen notwendig.
Zur Gewinnung von stromproportionalen Spannungen sind in den Leitungszug geschalteten Nebenwiderstände (shunts) bekannt. Die daran abfallenden Spannungen werden den elektronischen Schaltungen zugeführt. Nebenwiderstände können nur in solchen seltenen Fällen verwendet werden, wo keine Potentialtren.nung zwischen Leitung und
elektronischer Schutzschaltung notwendig ist und ein Widerstand
in der Leitung zulässig ist.For the supply of electronic protective circuits, voltages proportional to the alternating current to be monitored are necessary.
Shunts connected to the line are known to generate voltages proportional to the current. The voltages dropped across it are fed to the electronic circuits. Shunt resistors can only be used in those rare cases where there is no potential separation between line and
electronic protection circuit is necessary and a resistor
is permitted in the line.

Weiterhin ist es bekannt, zur Gewinnung von stromproportionalen
Spannungen Stromwandler mit geschlossenem Eisenkern zu verwenden, die auf der Sekundärseite mit einem, ohm1sehen Widerstand
belastet sind. Die strornproportionale Spannung wird an den ohm'
sehen Widerstand abgegriffen. Der notwendige Eisenquersehnitt
eines Stromwandlers wird abgesehen von den gegebenen Grossen, wie Strom, Frequenz, Windungszahl und Induktion, durch die totale Se-It is also known for the extraction of electricity proportional
Use voltage current transformers with closed iron core, which see on the secondary side with a, 1 ohm resistor
are burdened. The voltage proportional to the current is applied to the ohm '
see resistance tapped. The necessary iron cross-section
of a current transformer, apart from the given quantities, such as current, frequency, number of turns and induction, the total se-

309843/0790309843/0790

kundärimpedanz bestimmt. Der äussere ohm'sche Widerstand an der Sekundärseite des Stromwandlers ist in den meisten Fällen verhältnismässig gross gegenüber der inneren Impedanz, so dass die totale Sekundärimpedanz und somit auch der notwendige Eisenquerschnitt stark vom äusseren ohm'sehen Widerstand an der Sekundärseite abhängt. Solche für die Speisung von elektronischen Schutzschaltungen gebauten Stromwandler weisen relativ grosse Abmessungen auf und sind unwirtschaftlich.secondary impedance determined. The external ohmic resistance at the The secondary side of the current transformer is proportionate in most cases large compared to the internal impedance, so that the total secondary impedance and thus also the necessary iron cross-section strongly depend on the external ohmic resistance on the secondary side depends. Such current transformers built for the supply of electronic protective circuits have relatively large dimensions on and are uneconomical.

Der Erfindung liegt die Aufgabe zu Grunde einen wirtschaftlich vorteilhaften Strommesswandler zur Gewinnung einer dem zu messenden Strom proportionalen Spannung mit kleinen Abmessungen·zu bauen.The invention is based on the object of an economically advantageous one Current transducers for obtaining a voltage proportional to the current to be measured with small dimensions · to be built.

Die gestellte Aufgabe ist erfindungsgemäss dadurch gelöst, dass die Sekundärwicklung ohne Bürdenimpedanz direkt kurzgeschlossen ist und der Eisenkern mit mindestens einer weiteren Wicklung versehen ist, an deren Anschlüssen die dem zu messenden Strom proportionale Spannung auftritt.The object set is achieved according to the invention in that the secondary winding is directly short-circuited without a burden impedance and the iron core is provided with at least one further winding, at the connections of which the current to be measured is proportional Tension occurs.

Eine besonders vorteilhafte Ausbildung des Erfindungsgegenstandes kann dadurch erreicht werden, dass der Eisenkern nur einen Teil einer den zu messenden Strom zu führen bestimmten Metallschienen umgibt, wobei die kurzgeschlossene Sekundärwicklung durch die Metallschiene selbst gebildet ist.A particularly advantageous embodiment of the subject matter of the invention can be achieved in that the iron core is only part of a metal rail designed to carry the current to be measured surrounds, the short-circuited secondary winding being formed by the metal rail itself.

Ira folgenden werden anhand der beiliegenden Zeichnung zwei Ausführungsbeispiele der Erfindung näher beschrieben. Es zeigen:The following are two exemplary embodiments with reference to the accompanying drawings the invention described in more detail. Show it:

Fig. 3 einen um eine Schiene angeordneten Strommesswandler in perspektivischer Darstellung und3 shows a current transducer arranged around a rail in perspective and

Fig. 2 einen weiteren Strommesswandler mit einem nur einen Teil einer Strom zu führenden bestimmten Metallschiene umfassenden Eisenkern.Fig. 2 shows a further current transducer with only one Part of a specific metal rail to be carried comprehensive iron core.

Der in Fig. 1 dargestellte Strommesswandler ist um die den zu messenden Strom zu führen bestimmte Schiene 1 angeordnet.The current transducer shown in Fig. 1 is to the measuring current to lead certain rail 1 arranged.

309843/0790309843/0790

- 3 - 230390ß- 3 - 230390ß

Er besteht aus dem zweiteiligen Eisenkern 2 und 3, dessen beide Hälften nicht lamelliert und steckerartig ineinandergestossen sind, aus der kurzgeschlossenen Sekundärwicklung 4, die aus einem mit einem Loch versehenen Kupfer-Rundstab gebildet ist, und aus der weiteren Wicklung 5 zwischen deren Anschlüssen 6 und 7 die dem in der Schiene 1 fliessenden Strom proportionale Spannung auftritt.It consists of the two-part iron core 2 and 3, the two halves of which are not laminated and butted into one another like a plug are, from the short-circuited secondary winding 4, which is formed from a copper rod provided with a hole, and from the further winding 5 between its terminals 6 and 7 the voltage proportional to the current flowing in the rail 1 occurs.

Die Montage und.die Herstellung des in Fig. 1 dargestellten Strommesswandlers ist sehr einfach. Der Oberteil 2 des Eisenkerns besteht aus einem gebogenen ferromagnetischen Rundstab, der Unterteil 3 aus einem gebogenen ferromagnetischen Rohr. Der Draht der Wicklung 5 ist mit einer elektrischen Isolation versehen. Bei Bedarf kann zwischen der Wicklung 5 und dem Unterteil 3 des Eisenkernes eine weitere elektrische Isolation angebracht werden.The assembly und.die production of the current transducer shown in Fig. 1 is very easy. The upper part 2 of the iron core consists of a curved ferromagnetic rod, the lower part 3 from a bent ferromagnetic tube. The wire of Winding 5 is provided with electrical insulation. If necessary, between the winding 5 and the lower part 3 of the iron core further electrical insulation can be attached.

In Fig. 2 wird der, zu messende Strom i durch die Metallschiene 8 gb+ührt. Der aus den beiden durch die Metallschiene 8 geführten ferromagnetischen Bolzen 9 und aus den beiden die Bolzenenden aufnehmenden ferromagnetischen Platten 10 bestehende Eisenkern 11 umgibt nur einen Teil der, f'letallschiene 8. Die kurzgeschlossene Sekundärwicklung ist durch die Metallschiene 8 gebildet und umfasst die beiden Bolzen 9. Die aus isoliertem Draht bestehende weitere Wicklung 5 ist auf eine der ferromagnetischen Platten 10 gewickelt. Die dem Strom i proportionale Spannung tritt zwischen den Anschlüssen B und 7 auf. Das Verhältnis zwischen dem in der Metallschiene 8 fliessenden Strom i und der dem Strom i proportionalen Spannung an den Klemmen B und 7 kann durch die Wahl der Winkel α den gegebenen Verhältnissen angepasst werden. Der Winkel α liegt zwischen der die Lochmitten 12 verbindenden Gerade und den Längskanten 13 der Metallschiene 8. Durch diese Einstellmöglichkeit des Strom-Spannung-Verhältnisses ist es möglich, einen einzigen mit der Wicklung 5 versehenen Eisenkern 11 für mehrere Strombereiche zu verwenden.In FIG. 2, the current i to be measured is through the metal rail 8 gb + guards. From the two ferromagnetic bolts 9 passed through the metal rail 8 and from the two the bolt ends receiving ferromagnetic plates 10 existing iron core 11 surrounds only part of the, metal rail 8. The short-circuited The secondary winding is formed by the metal rail 8 and comprises the two bolts 9. The one made of insulated wire Another winding 5 is on one of the ferromagnetic plates 10 wrapped. The voltage proportional to the current i occurs between the connections B and 7. The relationship between that in the Metal rail 8 flowing current i and the voltage proportional to the current i at terminals B and 7 can be determined by the choice of the angle α can be adapted to the given conditions. The angle α lies between the straight line connecting the hole centers 12 and the Longitudinal edges 13 of the metal rail 8. This adjustment option for the current-voltage ratio makes it possible to use a single to use the iron core 11 provided with the winding 5 for several current ranges.

309843/0790309843/0790

Claims (4)

Patentansprü c h e :Patent claims: 1. Strommesswandler zur Gewinnung einer dem zu messenden Strom proportionalen Spannung, mit einem vom zu messenden Strom durchfluteten und mit einer Sekundärwicklung versehenen geschlossenen Eisenkern, dadurch gekennzeichnet, aass die Sekundärwicklung (4) ohne Bürdenimpedanz direkt kurzgeschlossen ist und der Eisenkern (2, 3, 11) mit mindestens einer weiteren Wicklung (5) versehen ist, an deren Anschlüssen (6, 7) die dem zu messenden Strom proportionale Spannung auftritt.1. Current transducer for obtaining one to be measured Voltage proportional to current, with a closed loop through which the current to be measured flows and provided with a secondary winding Iron core, characterized in that the secondary winding (4) is directly short-circuited without burden impedance and the Iron core (2, 3, 11) is provided with at least one further winding (5), at whose connections (6, 7) the one to be measured Current proportional voltage occurs. 2. Strommesswandler nach Anspruch 1, dadurch gekennzeichnet, dass die kurzgeschlossene Sekundärwicklung aus einem mit einer zur Aufnahme des vollen Eisenquerschnittes mindestens auf einen Teil der gesamten Eisenlänge ausgebildeten Öffnung versehenen festen Metallblock besteht.2. Current transducer according to claim 1, characterized in that that the short-circuited secondary winding from one with one to accommodate the full iron cross-section at least a solid metal block provided with an opening formed part of the entire length of the iron. 3. Strommesswandler nach Anspruch 1, dadurch gekennzeichnet, dass der Eisenkern (11) nur einen Teil einer den zu messenden Strom (i) zu führen bestimmten Metallschienen (8) umgibt, wobei die kurzgeschlossene Sekundärwicklung durch die Metallschiene (8.) selbst gebildet ist.3. Current transducer according to claim 1, characterized in that the iron core (11) is only part of the to be measured Current (i) to lead certain metal rails (8) surrounding it, with the short-circuited secondary winding through the metal rail (8.) is formed by itself. 4. Strommesswandler nach Anspruch 3, dadurch gekennzeichnet, dass die den zu messenden Strom (i) zu führen bestimmte Metallschiene (8) zwei zur Durchführung der Eisenquerschnitte geeignete Löcher (12) aufweist, wobei der zwischen der die Lochmitten verbindenden Gerade und den Längskanten (13) der Metallschiene (8) eingeschlossene Winkel (cc) zwischen 0 und 90° liegt.4. Current transducer according to claim 3, characterized in that the current to be measured (i) to lead certain Metal rail (8) has two holes (12) suitable for carrying out the iron cross-sections, the one between the hole centers connecting straight line and the longitudinal edges (13) of the metal rail (8) included angles (cc) between 0 and 90 °. 9-84 3 /07 909-84 3/07 90
DE19732303906 1972-04-10 1973-01-26 CURRENT MEASURING CONVERTER FOR OBTAINING A VOLTAGE PROPORTIONAL TO THE CURRENT TO BE MEASURED Pending DE2303906A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH520172A CH537085A (en) 1972-04-10 1972-04-10 Current transducer for obtaining a voltage proportional to the current to be measured

Publications (1)

Publication Number Publication Date
DE2303906A1 true DE2303906A1 (en) 1973-10-25

Family

ID=4289621

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19732303906 Pending DE2303906A1 (en) 1972-04-10 1973-01-26 CURRENT MEASURING CONVERTER FOR OBTAINING A VOLTAGE PROPORTIONAL TO THE CURRENT TO BE MEASURED

Country Status (6)

Country Link
JP (1) JPS4915925A (en)
AT (1) AT330890B (en)
CH (1) CH537085A (en)
DE (1) DE2303906A1 (en)
ES (1) ES413080A1 (en)
GB (1) GB1404719A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3401587A1 (en) * 1983-03-02 1984-09-13 LGZ Landis & Gyr Zug AG, Zug MEASURING CONVERTER FOR MEASURING A CURRENT
DE29708694U1 (en) * 1997-05-15 1998-09-17 Siemens Ag Current transformers for AC measurements in the low voltage range
DE10011050A1 (en) * 2000-03-07 2002-01-03 Vacuumschmelze Gmbh Transformer for a compensation current sensor
DE102005007971B4 (en) * 2004-02-27 2008-01-31 Magnetec Gmbh Current transformer with compensation winding

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3243274C2 (en) * 1982-10-28 1985-04-04 LGZ Landis & Gyr Zug AG, Zug Device for adapting the measuring current to a measuring device for measuring electrical currents
CH658930A5 (en) * 1983-04-25 1986-12-15 Landis & Gyr Ag CURRENT DIVIDER FOR MEASURING TRANSDUCERS FOR MEASURING A CURRENT.
JPS6060562A (en) * 1983-09-13 1985-04-08 Mitsubishi Electric Corp Current detecting circuit
NO175394C (en) * 1991-07-01 1994-10-05 Abb En As Device for measuring current
DE29814298U1 (en) * 1998-07-30 1998-11-19 Siemens Ag Current transformer arrangement with a busbar as the primary winding
US6175229B1 (en) * 1999-03-09 2001-01-16 Eaton Corporation Electrical current sensing apparatus
US6087800A (en) * 1999-03-12 2000-07-11 Eaton Corporation Integrated soft starter for electric motor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3401587A1 (en) * 1983-03-02 1984-09-13 LGZ Landis & Gyr Zug AG, Zug MEASURING CONVERTER FOR MEASURING A CURRENT
DE29708694U1 (en) * 1997-05-15 1998-09-17 Siemens Ag Current transformers for AC measurements in the low voltage range
DE10011050A1 (en) * 2000-03-07 2002-01-03 Vacuumschmelze Gmbh Transformer for a compensation current sensor
US7057485B2 (en) 2000-03-07 2006-06-06 Vacuumschmelze Gmbh & Co. Kg Current transformer for a compensating current sensor
DE102005007971B4 (en) * 2004-02-27 2008-01-31 Magnetec Gmbh Current transformer with compensation winding

Also Published As

Publication number Publication date
AT330890B (en) 1976-07-26
GB1404719A (en) 1975-09-03
JPS4915925A (en) 1974-02-12
ATA257373A (en) 1975-10-15
CH537085A (en) 1973-05-15
ES413080A1 (en) 1976-01-01

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