AT167577B - Display device, in particular for testing the insulation of electrical lines - Google Patents
Display device, in particular for testing the insulation of electrical linesInfo
- Publication number
- AT167577B AT167577B AT167577DA AT167577B AT 167577 B AT167577 B AT 167577B AT 167577D A AT167577D A AT 167577DA AT 167577 B AT167577 B AT 167577B
- Authority
- AT
- Austria
- Prior art keywords
- insulation
- display device
- testing
- electrical lines
- parallel current
- Prior art date
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
-
- 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
- G01R31/58—Testing of lines, cables or conductors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Description
<Desc/Clms Page number 1>
Anzeigeeinrichtung insbesondere zur Isolationsprüfung elektrischer Leitungen
In der Technik tritt häufig die Notwendigkeit ein, kleine Gleichspannungsänderungen, wie sie z. B. in Schaltungen für Isolations-oder Widerstandsmessungen auftreten, ohne nennenswerte Leistungsentnahme aus der Messeinrichtung optisch oder akustisch anzuzeigen oder Schalteinrichtungen auszulösen.
Gegenstand der Erfindung ist eine Anzeigevorrichtung mit Differentialschaltung für vorgenannte Zwecke, deren einander entgegenwirkende Komponenten in zueinander parallelen Stromzweigen erzeugt werden, die erfindunggemäss über einen gemeinsamen Vorschaltwiderstand gespeist werden, wobei zweckmässig der eine parallele Stromzweig eine Elektronenröhre enthält, die in Abhängigkeit von der anzuzeigenden Grösse gesteuert wird.
In der Zeichnung ist ein Ausführungsbeispiel der erfindungsgemässen Einrichtung in vereinfachter Form gezeigt. Es bedeuten 1 und 2 die Spulen eines Differentialrelais, die in parallelen Stromzweigen liegen. Der eine dieser Stromzweige führt über eine Elektronenröhre 3, der andere über den Widerstand 4. Der Strom der Röhre wird durch die bei 6, 7 angelegte Steuerspannung geändert. Der Widerstand 4 ist so dimensioniert, dass sich die in den Spulen 1 und des Differentialrelais fliessenden Ströme im Ruhezustand in der Wirkung aufheben. Die beiden Parallelstromzweige werden über den gemeinsamen Vorwiderstand 5 von der Stromquelle aus 8 und 9 gespeist. Bei Auftreten einer Steuerspannung an den Klemmen 6, 7 z.
B. im Sinne einer Vergrösserung des Stromes in der Spule 1 steigt der Spannungsabfall im Widerstand 5, womit der auf den Widerstand und die Spule 2 entfallende Spannungsanteil sinkt. Dadurch nimmt der Strom in der Spule 2 ab. Es hat daher ein Stromanstieg in Spule 1 einen Stromabfall in Spule 2 zur Folge und umgekehrt, wodurch eine hohe Ansprechempfindlichkeit erreicht wird. Durch geeignete Dimensionierung der Widerstandswerte der beiden Parallelstromzweige und des Vorwiderstandes 5 sowie durch entsprechende Wahl der Windungszahlen für die Spulen 1 und 2 kann eine optimale Wirkung erzielt werden.
Durch Kontaktgebung bei 10 kann in an sich bekannter Weise ein Arbeitsstromkreis geschlossen werden.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
<Desc / Clms Page number 1>
Display device, in particular for testing the insulation of electrical lines
In technology there is often a need to measure small DC voltage changes, such as those that occur e.g. B. occur in circuits for insulation or resistance measurements without visually or acoustically indicating any significant power consumption from the measuring device or triggering switching devices.
The invention relates to a display device with a differential circuit for the aforementioned purposes, the counteracting components of which are generated in mutually parallel current branches which, according to the invention, are fed via a common series resistor, wherein the one parallel current branch expediently contains an electron tube which is controlled as a function of the size to be displayed becomes.
In the drawing, an embodiment of the device according to the invention is shown in simplified form. 1 and 2 are the coils of a differential relay, which are in parallel branches. One of these current branches leads via an electron tube 3, the other via the resistor 4. The current of the tube is changed by the control voltage applied at 6, 7. The resistor 4 is dimensioned so that the currents flowing in the coils 1 and the differential relay cancel each other out in the rest state. The two parallel branches are fed via the common series resistor 5 from the current source from 8 and 9. When a control voltage occurs at terminals 6, 7 z.
B. in the sense of an increase in the current in the coil 1, the voltage drop in the resistor 5 increases, so that the voltage portion allotted to the resistor and the coil 2 decreases. As a result, the current in the coil 2 decreases. An increase in current in coil 1 therefore results in a current decrease in coil 2 and vice versa, as a result of which a high sensitivity is achieved. An optimal effect can be achieved by suitable dimensioning of the resistance values of the two parallel current branches and the series resistor 5 and by appropriate selection of the number of turns for the coils 1 and 2.
By making contact at 10, a working circuit can be closed in a manner known per se.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT167577T | 1945-12-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
AT167577B true AT167577B (en) | 1951-01-25 |
Family
ID=3654003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT167577D AT167577B (en) | 1945-12-14 | 1945-12-14 | Display device, in particular for testing the insulation of electrical lines |
Country Status (1)
Country | Link |
---|---|
AT (1) | AT167577B (en) |
-
1945
- 1945-12-14 AT AT167577D patent/AT167577B/en active
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