DE2162040A1 - CIRCUIT FOR DETECTING LINE SHORT CIRCUITS - Google Patents

CIRCUIT FOR DETECTING LINE SHORT CIRCUITS

Info

Publication number
DE2162040A1
DE2162040A1 DE2162040A DE2162040A DE2162040A1 DE 2162040 A1 DE2162040 A1 DE 2162040A1 DE 2162040 A DE2162040 A DE 2162040A DE 2162040 A DE2162040 A DE 2162040A DE 2162040 A1 DE2162040 A1 DE 2162040A1
Authority
DE
Germany
Prior art keywords
circuit
line
resistor
circuit according
potential
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.)
Granted
Application number
DE2162040A
Other languages
German (de)
Other versions
DE2162040B2 (en
DE2162040C3 (en
Inventor
Raimund Dipl Ing Willecke
Friedrich Zuther
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.)
Auergesellschaft GmbH
Original Assignee
Auergesellschaft GmbH
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 Auergesellschaft GmbH filed Critical Auergesellschaft GmbH
Priority to DE2162040A priority Critical patent/DE2162040C3/en
Publication of DE2162040A1 publication Critical patent/DE2162040A1/en
Publication of DE2162040B2 publication Critical patent/DE2162040B2/en
Application granted granted Critical
Publication of DE2162040C3 publication Critical patent/DE2162040C3/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Description

"Schaltung zum Erfassen von Leitungskurzschlüssen" Die Erfindung bezieht sich auf eine Schaltung zum Erfassen von Leitungskurzschlüssen. "Circuit for detecting line short-circuits" The invention relates to a circuit for detecting line shorts.

Bei bekannten Schaltungen dieser Art wird die Spannung bzw.In known circuits of this type, the voltage or

der Strom im Leitungskreis gemessen. Jedoch ist diese Art der Erfassung nicht immer anwendbar: So ist in einem Konstantstromsystem die Strommessung ohne Aussagekraft im Kurzschlußfall.the current measured in the line circuit. However, this is the type of capture not always applicable: In a constant current system, the current measurement is without Significance in the event of a short circuit.

Andererseits ist die Spannungsmessung nur dann sinnvoll, wenn die Leitungswiderstände klein gegenüber dem Abschlußwiderstand sind; andernfalls müßte die Ansprechschwelle des Spannungsdiskriminators je nach Leitungslänge individuell eingestellt werden.On the other hand, voltage measurement is only useful if the Line resistances are small compared to the terminating resistance; otherwise would have to the response threshold of the voltage discriminator depending on the cable length can be set individually.

Umgekehrt ist in einem Konstantspannungssystem die Spannungsmessung ohne Aussagekraft, wenn die Quelle hinreichend niederohmig ist. Eine Strommessung wäre nur dann sinnvoll, wenn die Leitungswiderstände klein gegenüber dem Abschlußwiderstand sind.The reverse is the voltage measurement in a constant voltage system without meaningfulness if the source is sufficiently low-resistance. A current measurement would only make sense if the line resistances were small compared to the terminating resistor are.

Darüberhinaus ist es bei diesen Schaltungen nicht möglich, sogenannte Teilkurzschlüsse, bei denen ein rela-tiv hoher Übergangswiderstand erhalten bleibt (z.B. bei Isolationsverlusten durch Korrosion der Isolation) zu erfassen. Schließlich kommen solche Schaltungen überall dort nicht in Frage, wo die Last Schwankungen unterworfen ist.In addition, it is not possible with these circuits, so-called Partial short circuits in which a relatively high contact resistance is retained (e.g. in the event of insulation losses due to corrosion of the insulation). In the end Such circuits are out of the question wherever the load fluctuates is subject.

Der Erfindung liegt die Aufgabe zugrunde, eine sichere Überwachung von Zurzschlüssen zu schaffen.The invention is based on the object of reliable monitoring of connections to create.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß jede Leitung dort, wo Kurzschlüsse auftreten können, abgeschirmt ist und daß der Schirm über ein Meßinstrument mit einer Quelle vebunden ist, deren Potential sich vom Potential der Leitung unterscheidet.This object is achieved according to the invention in that each line where short circuits can occur, is screened and that the screen is over a measuring instrument is connected to a source whose potential differs from the potential the line differs.

Tritt ein Kurzschluß auf, dann nimmt der Schirm das Potential der Leitung an, und dieses wird vom Meßinstrument angezeigt.If a short circuit occurs, the screen takes the potential of the Line on, and this is indicated by the measuring instrument.

In der einzigen Figur der Zeichnung ist ein Ausführungsbeispiel veranschaulicht.In the single figure of the drawing, an embodiment is illustrated.

Dieses weist ein Kabel, bestehend aus Adern 1, au@, das Widerstände 2 mit einer nicht dargestellten Schaltung verbindet. Jede Aaer ist von einem leitenden Schirm 3 umgeben. Die Schieme sind miteinander und über einen Widerstand 4 mit einer Bezugsleitung 5 verbunden, deren Potential sich von den Potentialen der Ader 1 unterscheidet. Mit 6 ist ein Diskriminstor bezeichnet, der eine über den Widerstand 4 eventuel abfallende Spannung erfaßt.This has a cable consisting of wires 1, au @, the resistors 2 connects to a circuit not shown. Every body is of a senior executive Surrounding screen 3. The loops are with each other and via a resistor 4 with a Reference line 5 connected, the potential of which differs from the potential of wire 1. 6 with a discriminator is designated, the one via the resistor 4 eventuel falling voltage detected.

Solange jede Ader 1 enwandfrei isoliert ist, füllt über dem Widerstand 4 keine Spannung ab. Sobald jedoch die Isolierung einer Ader beeintrachtigt ist, erhält der dieser Ader zugeordnete Schirm ein Potential gegenüber 5, ein Strom fließt durch den Widerstand 4, dessen Spannungsabfall vom Diskriminator angezeigt wird.As long as each wire 1 is properly insulated, the resistor fills 4 no tension. However, as soon as the insulation of a wire is impaired, If the screen assigned to this wire has a potential compared to 5, a current flows through the resistor 4, the voltage drop of which is displayed by the discriminator.

In gewissen Grenzen ist es mit der erfindungsgemäßen Schaltung rnoglich, aus dem zu dem Bezugspotential fließenden Strom auf die Größe des Kurzschlußwiderstandes zu schließen.With the circuit according to the invention it is possible within certain limits from the current flowing to the reference potential to the size of the short-circuit resistance close.

Claims (1)

P a t e n t a n s p r ü c h e : P a t e n t a n s p r ü c h e: Schaltung zum Erfassen von Leitungskurzschlüssen, dadurch g e k e n n z e i c h n e t , daß jede Leitung (1) dort, wo Kurzschlüsse auftreten können, abgeschirmt ist und daß der Schirm (3) über ein Meßinstrument (4,6) mit einer Quelle (5) verbunden ist, deren Potential sich vom Potential der Leitung (1) unterscheidet. Circuit for detecting line short-circuits, thereby g e k e n n n z e i c h n e t that every line (1) where short circuits can occur, is shielded and that the screen (3) via a measuring instrument (4,6) with a source (5) is connected, the potential of which differs from the potential of the line (1). 2. Schaltung nach Anspruch 1, dadurch g e k e n n z e i c h -n e t , daß allen Schirmen (3) einer Schaltung, insbesondere der Adern (1) eines Kabels, ein Meßinstrument (4,6) zugeordnet ist.2. A circuit according to claim 1, characterized in that g e k e n n z e i c h -n e t that all shields (3) of a circuit, in particular the wires (1) of a cable, a measuring instrument (4,6) is assigned. 5. Schaltung nach Anspruch 1 oder 2, dadurch g e k e n n -z e i c h n e t , daß mit dem Meßinstrument (4,-6) eine Alarmanlage verbunden ist.5. A circuit according to claim 1 or 2, characterized in that g e k e n n -z e i c h n e t that an alarm system is connected to the measuring instrument (4, -6). 4. Schaltung nach Ansprüchen 1 bis 3, dadurch g e k e n n -z e i c h n e t , daß zwischen dem (den) Schirm(en) (3) und der Quelle ein Widerstand (4) liegt, dessen Enden mit einer Diskriminatorschaltung (6) verbunden sind.4. Circuit according to claims 1 to 3, characterized in that g e k e n n -z e i c n e t that between the screen (s) (3) and the source there is a resistor (4) lies, the ends of which are connected to a discriminator circuit (6). 5. Schaltung nach Anspruch 4, dadurch g e k e n n z e i c h -n e t , daß im Falle von Wechselstrom in den Leitungen (1) der Widerstand (4) ein Gleichrichter ist.5. A circuit according to claim 4, characterized in that g e k e n n z e i c h -n e t that in the case of alternating current in the lines (1) the resistor (4) is a rectifier is. 6. Schaltung nach Anspruch 4, dadurch g e k e n n z e i c h -n e t , daß im Falle von Gleichströmen unterschiedlicher Polaritat in den Leitungen (1) der Widerstand (4) ein Brückengleichrichter ist.6. A circuit according to claim 4, characterized in that g e k e n n z e i c h -n e t that in the case of direct currents of different polarity in the lines (1) the resistor (4) is a bridge rectifier. L e e r s e i t eL e r s e i t e
DE2162040A 1971-12-10 1971-12-10 Circuit arrangement for detecting line short-circuits Expired DE2162040C3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2162040A DE2162040C3 (en) 1971-12-10 1971-12-10 Circuit arrangement for detecting line short-circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2162040A DE2162040C3 (en) 1971-12-10 1971-12-10 Circuit arrangement for detecting line short-circuits

Publications (3)

Publication Number Publication Date
DE2162040A1 true DE2162040A1 (en) 1973-06-14
DE2162040B2 DE2162040B2 (en) 1975-04-03
DE2162040C3 DE2162040C3 (en) 1975-11-20

Family

ID=5827967

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2162040A Expired DE2162040C3 (en) 1971-12-10 1971-12-10 Circuit arrangement for detecting line short-circuits

Country Status (1)

Country Link
DE (1) DE2162040C3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019203627A1 (en) * 2019-03-18 2020-09-24 Siemens Healthcare Gmbh Detection of disturbances in the measurement of bioelectrical signals

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4026799A1 (en) * 1990-08-24 1992-02-27 Licentia Gmbh Selective detection of faults in conductors in high voltage network - by comparing conductor voltages and currents with earth current and star earth voltage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019203627A1 (en) * 2019-03-18 2020-09-24 Siemens Healthcare Gmbh Detection of disturbances in the measurement of bioelectrical signals
US11517266B2 (en) 2019-03-18 2022-12-06 Siemens Healthcare Gmbh Detection of interference when measuring bioelectric signals

Also Published As

Publication number Publication date
DE2162040B2 (en) 1975-04-03
DE2162040C3 (en) 1975-11-20

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Legal Events

Date Code Title Description
C3 Grant after two publication steps (3rd publication)
E77 Valid patent as to the heymanns-index 1977
EHJ Ceased/non-payment of the annual fee