DE2509661C2 - Device for measuring the insulation resistance of unearthed direct current networks - Google Patents
Device for measuring the insulation resistance of unearthed direct current networksInfo
- Publication number
- DE2509661C2 DE2509661C2 DE19752509661 DE2509661A DE2509661C2 DE 2509661 C2 DE2509661 C2 DE 2509661C2 DE 19752509661 DE19752509661 DE 19752509661 DE 2509661 A DE2509661 A DE 2509661A DE 2509661 C2 DE2509661 C2 DE 2509661C2
- Authority
- DE
- Germany
- Prior art keywords
- measuring
- direct current
- insulation resistance
- current networks
- voltage
- 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
- 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
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Description
zwe^two ^
Die Erfindung bezieht sich auf eine Einrichtung zur Durchführung des Verfahren! zur Messung des Isolationswiderstandes von ungeerdeten Gleichstromnetzen nach Patent 23 57 081 m;t einem Rechteckgenerator, der mit dem einen Pol an Erde und mit dem anderen Pol über einen Widerstand an das Gleichstromnetz angeschlossen ist, und einem vom Rechteckgenerator gesteuerten Schalter, Jer mn periodischen Ladungsstößen einen Speicherksjnriensator auflädt, dessen Spannung einem Integrationsvers· irker zugeführt und angezeigt wird.The invention relates to a device for carrying out the method! for measuring the insulation resistance of unearthed direct current networks according to patent 23 57 081 m ; t a square-wave generator, one pole of which is connected to earth and the other pole via a resistor to the direct current network, and a switch controlled by the square-wave generator, Jer mn periodic surge charges a storage capacitor, the voltage of which is fed to an integration circuit and displayed .
In der Einrichtung nach dem Hauptpatent ist der Speicherkondensator bei Einschalten des Gerätes zunächst entladen, so daß vorübergehend ein Isolationswiderstand Null angezeigt wird, obwohl die Netzisolation fehlerfrei sein kann.In the device according to the main patent, the storage capacitor is when the device is switched on initially discharged, so that an insulation resistance of zero is temporarily displayed, although the network insulation can be error-free.
Der Zusatzerfindung liegt die Aufgabe zugrunde, dis Einrichtung nach dem Hauptpatent so zu verbessern, daß beim Einschalten eine irritierende Anzeige nichtThe additional invention is based on the task of dis To improve the device according to the main patent so that when you switch on an irritating display
ondensato- ;esteuertenondensato-; controlled
„'mit einen Sofort eine Integrationsverstärker"'with one Immediately an integration amplifier
daß der Speicherkondensator in
ren aufgeteilt ist, von denen der
Schalter überbrückt und der zweitthat the storage capacitor in
ren is divided, of which the
Switch bridged and the second
Die beiden Tellkonjjensatoren
Spannungsteiler, an dessen Ab;
Spannung anliegt, die den
aussteuern kann. .The two Tell Konjjjensatoren
Voltage divider at whose Ab;
Voltage is present, which the
can control. .
Ein Ausführungsbeispiel der Erfindung wird anhand der Zeichnung erläutert '^" '" 'An embodiment of the invention is explained with reference to the drawing '^ "'" '
Mit N ist das Gleichstromnetz mit der Spannung Un bezeichnet dem über Koppelwiderstände Rkj2 eine Rechteckspannung überlagert ist, die aus den Teilspannungen Uc/2 mit Hilfe eines elektronischen Umschalters Si erzeugt ist Dieser Umschalter wird von einem Steuergenerator TG periodisch betätigt Die Meßleitung ist an den Verbindungspunkt zweier Koppelkondensatoren Ctu2 angeschlossen. Solange der Erdungswiderstand des Netzes Re unendlich ist, liegt das Gleichspannungspotential symmetrisch zur Erde. Ein mit Cq bezeichneter Kondensator bildet mit dem Koppelkondensator Ck einen kapazitiven Spannungsteiler, der die Spannung Un in einen reduzierten Wert U'n umformt Der Steuergenerator Tg steuert periodisch weitere Schalter 52 und 53 an. Bei Schließung des Schalters 52 wird der Kondensator Cq kurzgeschlossen und der Punkt M auf Erdpotential gebracht Der Schalter 53 ist mit dem positiven Eingang eines Integrationsverstärkers V verbunden. An dieser Verbindungsleitung liegt der in zwei Te'ilkondensatoren Cs /, Csr; aufgeteilte Speicherkondensator. Zwischen dem negativen und positiven Verstärkereingang liegt ein Widerstand R in Reihe mit einer Diode D\. Der Verbindungspunkt beider Elemente ist geerdet, so daß diese eine Schutzfunktion ausübende Diode parallel zum zweiten Teilkondensator Cs2 Hegt An den Ausgang des Verstärkers V ist ein Meßgerät M gelegt, das die verstärkte Spannung K- U'a anzeigt Die Teilkondensatoren Cs ι und Cs2 bilden einen kapazitiven Spannungsteiler, so daß beim Einschalten der Einrichtung sofort am Verstärker eine Spannung liegt. Somit zeigt das Meßgerät zunächst den Widerstand unendlich an, bevor es schrittweise auf den wahren Wert zurückgehtWith N the DC network is connected to the voltage U n denotes which a square-wave voltage is superimposed via coupling resistors Rkj2 which is generated from the partial voltages Uc / 2 with the aid of an electronic switch Si This switch is periodically actuated by a control generator T G The sense line is connected to the Connection point of two coupling capacitors Ctu2 connected. As long as the earthing resistance of the network Re is infinite, the direct voltage potential is symmetrical to earth. A designated Cq capacitor forms with the coupling capacitor Ck a capacitive voltage divider which converts the voltage Un in a reduced value u'n The control generator Tg periodically controls further switches 52 and 53 at. When the switch 52 closes, the capacitor Cq is short-circuited and the point M is brought to ground potential. The switch 53 is connected to the positive input of an integration amplifier V. The two partial capacitors Cs /, Csr; split storage capacitor. A resistor R is connected in series with a diode D \ between the negative and positive amplifier inputs. The point of connection of both elements is grounded, so that these protective function exerting diode a measuring device M is parallel to the second partial condenser Cs2 Hegt to the output of the amplifier V set indicative of the amplified voltage K- U'a The sub-capacitors Cs ι and Cs2 form a capacitive voltage divider, so that when the device is switched on, a voltage is immediately applied to the amplifier. Thus the measuring device first shows the resistance infinitely before it gradually goes back to the true value
Hierzu 1 Blatt Zeichnungen1 sheet of drawings
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19752509661 DE2509661C2 (en) | 1975-03-06 | 1975-03-06 | Device for measuring the insulation resistance of unearthed direct current networks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19752509661 DE2509661C2 (en) | 1975-03-06 | 1975-03-06 | Device for measuring the insulation resistance of unearthed direct current networks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE2509661A1 DE2509661A1 (en) | 1976-09-16 |
| DE2509661C2 true DE2509661C2 (en) | 1983-09-08 |
Family
ID=5940557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19752509661 Expired DE2509661C2 (en) | 1975-03-06 | 1975-03-06 | Device for measuring the insulation resistance of unearthed direct current networks |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE2509661C2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4837519A (en) * | 1985-09-06 | 1989-06-06 | Southern California Edison Company | Fault detection |
| US4929901A (en) * | 1985-09-06 | 1990-05-29 | Dorr Kimball | DC ground fault detection |
| NL8700941A (en) * | 1987-04-21 | 1988-11-16 | Croon Elektrotechniek B V | METHOD AND APPARATUS FOR TESTING SELF-LIMITING ELECTRIC HEATING CABLES OUT OF OPERATION |
| DE4339946A1 (en) * | 1993-11-24 | 1995-06-01 | Walther Bender Gmbh & Co Kg Di | Method and device for monitoring the insulation of unearthed direct and alternating current networks |
| GB9613287D0 (en) * | 1996-06-25 | 1996-08-28 | Raychem Ltd | Ground testing |
| CN106526323B (en) * | 2016-11-04 | 2019-03-29 | 北京航天发射技术研究所 | A kind of insulation resistance detection method based on the automatic compensation policy of square wave |
-
1975
- 1975-03-06 DE DE19752509661 patent/DE2509661C2/en not_active Expired
Non-Patent Citations (1)
| Title |
|---|
| NICHTS-ERMITTELT |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2509661A1 (en) | 1976-09-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8110 | Request for examination paragraph 44 | ||
| AF | Is addition to no. |
Ref country code: DE Ref document number: 2357081 Format of ref document f/p: P |
|
| D2 | Grant after examination | ||
| 8364 | No opposition during term of opposition | ||
| 8320 | Willingness to grant licences declared (paragraph 23) |