DE437654C - Testing and monitoring device for the insulation status of laid cables - Google Patents
Testing and monitoring device for the insulation status of laid cablesInfo
- Publication number
- DE437654C DE437654C DES68598D DES0068598D DE437654C DE 437654 C DE437654 C DE 437654C DE S68598 D DES68598 D DE S68598D DE S0068598 D DES0068598 D DE S0068598D DE 437654 C DE437654 C DE 437654C
- Authority
- DE
- Germany
- Prior art keywords
- cable
- resistor
- testing
- resistance
- insulation
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
- G01R27/18—Measuring resistance to earth, i.e. line to ground
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/20—Measuring number of turns; Measuring transformation ratio or coupling factor of windings
-
- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Testing Relating To Insulation (AREA)
Description
Prüf- und Überwachungseinrichtung für den Isolationszustand verlegter Kabel. Die Erfindung betrifft eine Prüf- und Vberwachungseinrichtung für den Isolationszustand verlegter Kabel, die sowohl zum Prüfen und :lfessen des Isolationswiderstandes als auch zur Fernmeldung von auftretenden Isolationsfehlern benutzt werden kann.Testing and monitoring equipment for the insulation status of the laid Cable. The invention relates to a testing and monitoring device for the state of insulation laid cables, which are used both for testing and: measuring the insulation resistance as can also be used for remote reporting of occurring insulation faults.
Gemäß der Erfindung erzeugt eine Gleichstromquelle, die an eine Doppelader des Kabels oder an eine Einzelader und den Kabelmantel angeschlossen ist, Spannungsänderungen an einem hochohmigen Widerstand, der zwischen Gitter und Kathode einer Elektronenröhre gelegt ist. In den Anodenkreis der Röhre sind ein Strommeßgerät und ein Relais, das bei einer bestimmten Stromstärke anspricht, eingeschaltet. In den Abbildungen sind zwei Ausführungsbeispiele der Erfindung dargestellt. Abb. z zeigt das grundsätzliche Schaltungsschema. Abb. 2 veranschaulicht eine Vereinfachung der Schaltung.According to the invention generates a direct current source that is connected to a pair of the cable or to a single core and the cable sheath, changes in voltage on a high resistance between the grid and the cathode of an electron tube is laid. In the anode circuit of the tube are an ammeter and a relay, which responds at a certain amperage, switched on. In the figures show two exemplary embodiments of the invention. Fig. Z shows the basic circuit diagram. Fig. 2 illustrates a simplification the circuit.
In Abb. z ist eine Batterie d über einen großen Vorschaltwiderstand r, an eine Doppelader a, b oder an eine Einzelader und den Bleimantel des zu überwachenden Kabels gelegt. An den Enden des Widerstandes r1 ist eine Verstärkerröhre e so angeschaltet, daß die dem Schwanken des Isolationswiderstandes entsprechenden Spannungsschwankungen am Widerstand r1 den Anodenstrom entsprechend der Kennlinie der Röhre e verändern und dadurch ein in dem Anodenstromkreis liegendes Relais g steuern. Ein Meßgerät f zeigt die jeweilige Stärke des Stromes im Anodenkreis an. Ein Widerstand w,_ dient als Sicherheitswiderstand für die meist einpolig geerdete Heizbatterie, da ein Erdschluß der Ader b sie sonst kurzschließen würde. Ein Widerstand w2 soll verhüten, daß bei Entladungen der angeschlossenen Kabelteile, die durch Drücken einer Taste la herbeigeführt werden können, die Entladeströme bei pupinisiertem Kabel einen die Pupinspulen gefährdenden Betrag erreichen.In Fig. Z, a battery d is connected to a large series resistor r, to a pair of wires a, b or to a single wire and the lead sheath of the cable to be monitored. At the ends of the resistor r1 an amplifier tube e is connected in such a way that the voltage fluctuations at the resistor r1 corresponding to the fluctuations in the insulation resistance change the anode current according to the characteristic of the tube e and thereby control a relay g located in the anode circuit. A measuring device f shows the respective strength of the current in the anode circuit. A resistor w, _ serves as a safety resistor for the heating battery, which is usually single-pole earthed, since an earth fault on wire b would otherwise short-circuit it. A resistor w2 is intended to prevent discharges of the connected cable parts, which can be brought about by pressing a button la, the discharge currents in the case of a pupinized cable from reaching an amount which endangers the pupin coils.
Soll die neue Einrichtung zur Messung des Isolationswiderstandes benutzt werden, so wird der Ausschlag des Meßgerätes f bei angeschlossenem Kabel bestimmt. Dann wird durch Umlegen des Schalters c in die gestrichelte Stellung ein Regelwiderstand l eingeschaltet und durch Kompensation der Isolationswiderstand gemessen.Should the new device be used to measure the insulation resistance the deflection of the measuring device f is determined with the cable connected. Then, by moving the switch c to the dashed position, a variable resistor is set l switched on and the insulation resistance measured by compensation.
Soll hingegen die neue Einrichtung zur Überwachung des Isolationszustandes dienen, so kann das Kabel dauernd angeschlossen bleiben. Das Relais g spricht bei einer bestimmten Stromstärke im Anodenkreis der Röhre an und bewirkt dann die Schließung eines Signalstromkreises, in dem ein in der Nähe oder entfernt aufgestelltes Signalgerät liegt. Es genügt im allgemeinen, die neue Einrichtung nur mit einer Doppelader eines Kabels zu verbinden, da etwaige Veränderungen des Isolationswiderstandes zwischen anderen Adern sich auch in den angeschlossenen Adern bemerkbar machen.Should, however, the new device for monitoring the insulation status are used, the cable can remain connected permanently. The relay g speaks at a certain amperage in the anode circuit of the tube and then causes the closure a signal circuit in which a signal device installed nearby or at a distance lies. In general, it is sufficient to connect the new facility with just one pair of wires Cable, since any changes in the insulation resistance between other cores are also noticeable in the connected cores.
Die Schaltung nach Abb. 2 ist insofern vereinfacht, als der über Schalter i an das Gitter der Röhre e angeschlossene hochohmige Widerstand r2 als Spannungsteiler ausgebildet ist. Außerdem ist ein Widerstand tv;a vorgesehen, der die beiden Widerstände w1 und w2 ersetzt. Eine feste Marke m am Meßgerät f deutet die Stärke des Stromes im Anodenkreise bei der gezeichneten Stellung des Schalters i und geschlossener Taste da an.The circuit according to Fig. 2 is simplified in that the high-resistance resistor r2 connected to the grid of the tube e via switch i is designed as a voltage divider. In addition, a resistor tv; a is provided, which replaces the two resistors w1 and w2. A fixed mark on the measuring instrument m f indicates the strength of the current in the anode circles in the illustrated position of the switch button i and closed there.
Zur beliebigen Wahl des Prüf- und Meldebereichs können noch ein Regelschalfer an der Batterie d und mehrere wahlweise einschaltbare, hochohmige Widerstände vorgesehen sein. Gegebenenfalls kann auch das Meßgerät f zugleich als Kontaktgeber für den Signalstromkreis ausgebildet sein, so daß sich die Anordnung des Relais g erübrigt. Auch können mehrere Elektronenröhren vorgesehen sein.A control switch can also be used to select any test and reporting area on the battery d and several optionally switchable, high-value resistors are provided be. If necessary, the measuring device f can also act as a contactor for the Signal circuit be designed so that the arrangement of the relay g is unnecessary. Several electron tubes can also be provided.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES68598D DE437654C (en) | 1925-01-27 | 1925-01-27 | Testing and monitoring device for the insulation status of laid cables |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES68598D DE437654C (en) | 1925-01-27 | 1925-01-27 | Testing and monitoring device for the insulation status of laid cables |
Publications (1)
Publication Number | Publication Date |
---|---|
DE437654C true DE437654C (en) | 1926-11-25 |
Family
ID=7500410
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DES68598D Expired DE437654C (en) | 1925-01-27 | 1925-01-27 | Testing and monitoring device for the insulation status of laid cables |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE437654C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE975275C (en) * | 1954-03-17 | 1961-10-26 | Oskar Vierling Dr | Device for testing multi-wire strands |
-
1925
- 1925-01-27 DE DES68598D patent/DE437654C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE975275C (en) * | 1954-03-17 | 1961-10-26 | Oskar Vierling Dr | Device for testing multi-wire strands |
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