DE854824C - Circuit arrangement for endangered measuring instruments, especially galvanometers in high-voltage measuring bridges - Google Patents
Circuit arrangement for endangered measuring instruments, especially galvanometers in high-voltage measuring bridgesInfo
- Publication number
- DE854824C DE854824C DES21676A DES0021676A DE854824C DE 854824 C DE854824 C DE 854824C DE S21676 A DES21676 A DE S21676A DE S0021676 A DES0021676 A DE S0021676A DE 854824 C DE854824 C DE 854824C
- Authority
- DE
- Germany
- Prior art keywords
- circuit arrangement
- relay
- measuring
- endangered
- galvanometers
- 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
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Description
Die Erfindung befaßt sich mit einer Schutzschaltung für gefährdete Meßinstrumente. Eine Gefährdung derartiger Instrumente tritt z. B. bei der Verwendung von empfindlichen Galvanometern in Hochspannungsmeßbrücken für die Kabelmessung auf. The invention is concerned with a protection circuit for people at risk Measuring instruments. Such instruments are at risk, for example. B. in use of sensitive galvanometers in high-voltage bridges for cable measurements on.
Bekanntlich werden derartige Kabel unter Hochspannung geprüft, und wenn dabei aus irgendwelchen Gründen der Fehlerwiderstand zusammenbricht, ist die Meßbrücke und damit das Meßinstrument Strömen bzw. Spannungen ausgesetzt, durch die es zerstört würde. Es ist bereits bekannt;geworden, sogenannte Schutzrelais vorzusehen, die in solchen Fällen eine Abschaltung des gefährdeten Meßinstrumentes durchführten.It is known that such cables are tested under high voltage, and if the fault resistance collapses for any reason, this is the Measuring bridge and thus the measuring instrument exposed to currents or voltages that it would destroy. It is already known, so-called protection relays provide that in such cases the endangered measuring instrument is switched off carried out.
Die bekannten Schutzrelais, die als polarisierte Relais mit Doppelkontakten ausgeführt waren, haben den großen Nachteil, daß sie bei Verwendung von gleichgerichteten Meßströmen infolge der notwendigen kurzen Ansprechzeiten zum Flattern neigen, d. h. keine sichere Messung gestatten. Man hat, um diese Erscheinung zu bekämpfen, auch bereits vorgeschlagen, eine elektrolytische Kondensatorschaltung zu verwenden, dabei treten aber wieder Störungen durch Restspannungen auf. The well-known protective relays, as polarized relays with double contacts were carried out, have the major disadvantage that when using rectified Measurement currents tend to flutter due to the short response times required, d. H. do not allow a safe measurement. In order to combat this phenomenon, one has also already proposed to use an electrolytic capacitor circuit, however, there are again disturbances due to residual stresses.
Der Erfindung liegt die Aufgabe zugrunde, eine Schutzschaltung zu schaffen, die in allen vorkommenden Fällen schnell und sicher für eine Abschaltung des gefährdeten Meßinstrumentes sorgt. The invention is based on the object of providing a protective circuit create a shutdown quickly and safely in all cases of the endangered measuring instrument.
Die erfindungsgemäße Lösung dieser Aufgabe besteht darin, daß dem Meßinstrument ein empfind liches durch eine Doppelweg-Gleichrichterschaltung von der Stromrichtung unabhängig ansprechendes, das Meßinstrument bei Auftreten von gefährdenden Strömen oder Spannungen abschaltendes Relais parallel geschaltet ist. Das Abschaltrelais ist dabei zweckmäßig als Kernmagnet-Drehspulrelais ausgebildet, d. h. mit einem sehr empfindlichen Meßwerk sehr kurzer Ansprechzeit. The inventive solution to this problem is that the A sensitive measuring instrument through a full-wave rectifier circuit of the measuring instrument responds independently of the current direction when hazardous currents or voltages switching off relay is connected in parallel. The cut-off relay is expediently designed as a core magnet moving coil relay, d. H. with a very sensitive measuring mechanism, very short response time.
Um diese Eigenschaften noch zu erhöhen, ist das neue Abschaltrelais mit Kippfedern und nur einem Abschaltekontakt ausgerüstet. Um die Wirkung des Flatterschutzes bei Verwendung von gleichgerichteten Meßströmen noch zu verbessern, ist dem Abschalterelais ein Kondensator parallel geschaltet. In order to increase these properties even further, there is a new cut-off relay Equipped with toggle springs and only one switch-off contact. About the effect of the flutter protection The cut-off relay can be improved when using rectified measuring currents a capacitor connected in parallel.
Zwecks Dämpfung bei Auftreten sehr kurzzeitiger Überströme, z. B. Kondensatorentladungen, ist dem Meßinstrument noch ein Kondensator parallel und eine Drosselspule vorgeschaltet. For the purpose of damping when very brief overcurrents occur, e.g. B. Capacitor discharges, a capacitor is still in parallel and the meter a choke coil connected upstream.
In der Zeichnung ist ein Ausführungsbeispiel der erfindungsgemäßen Schutzschaltung gezeigt. In the drawing is an embodiment of the invention Protection circuit shown.
Bei I liegt das Galvanometer 2 an der Brücke. At I the galvanometer 2 is on the bridge.
Dem Galvanometer 2 ist das als Kernmagnet-Drehspulrelais ausgebildete Relais 3 parallel ge schaltet. Damit das Relais 3 auf Ströme beider Richtungen anspricht, liegt es in Doppelweg-Gleichrichterschaltung mit den Gleichrichtern 4. Der Relaisschaltung ist der Widerstand 5 von etwa 200 Ohm vorgeschaltet. Parallel zur Relaiswicklung liegt zwecks Erhöhung des Flatterschutzes ein Trockenkondensator 6 (I6,uF). Zwecks Dämpfung hei Auftreten sehr kurzzeitiger überströmte ist dem Galvanometer 2 ein weiterer Trockenkondensator 7 (8 F) parallel geschaltet, während aus dem gleichen Grunde dem Galvanometer 2 eine Drossel 8 vorgeschaltet ist.The galvanometer 2 is designed as a core magnet moving coil relay Relay 3 switched in parallel. So that the relay 3 responds to currents in both directions, it is in a full-wave rectifier circuit with rectifiers 4. The relay circuit the resistor 5 of about 200 ohms is connected upstream. In parallel with the relay winding there is a dry capacitor 6 (I6, uF) to increase the flutter protection. For the purpose of The galvanometer 2 has attenuation when the flow occurs very briefly another dry condenser 7 (8 F) connected in parallel while out of the same Basically the galvanometer 2 is preceded by a throttle 8.
Durch diese Anordnung ist bei entsprechender Einstellung der Empfindlichkeit das Galvanometer 2 gegen jegliche gefährdende Spannungen bzw. With this arrangement, the sensitivity is adjusted accordingly the galvanometer 2 against any dangerous voltages or
Ströme durch Abschaltung am Relaiskontakt g gesichert.Currents secured by switching off the relay contact g.
PATENTANSPROCHE: I. Schaltungsanordnung für gefährdete Meßinstrumente, insbesondere Galvanometer in Hochspannungsmeßbrücken, dadurch gekennzeichnet, daß dem Meßinstrument ein empfindliches, durch eine Doppelweg-Gleichrichterschaltung von der Stromrichtung unabhängig ansprechendes, das Meßinstrument bei Auftreten von gefährdenden Strömen oder Spannungen abschaltendes Relais parallel geschaltet ist. PATENT APPROACH: I. Circuit arrangement for endangered measuring instruments, in particular galvanometers in high-voltage measuring bridges, characterized in that the measuring instrument a sensitive, through a full wave rectifier circuit regardless of the direction of the current, the measuring instrument responds when it occurs Relays that switch off dangerous currents or voltages are connected in parallel is.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES21676A DE854824C (en) | 1951-01-25 | 1951-01-25 | Circuit arrangement for endangered measuring instruments, especially galvanometers in high-voltage measuring bridges |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES21676A DE854824C (en) | 1951-01-25 | 1951-01-25 | Circuit arrangement for endangered measuring instruments, especially galvanometers in high-voltage measuring bridges |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE854824C true DE854824C (en) | 1952-11-06 |
Family
ID=7476591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES21676A Expired DE854824C (en) | 1951-01-25 | 1951-01-25 | Circuit arrangement for endangered measuring instruments, especially galvanometers in high-voltage measuring bridges |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE854824C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE969299C (en) * | 1953-10-11 | 1958-05-22 | Standard Elek K Ag | Device for protecting a measuring circuit with crystal diodes against inrush currents |
| DE1035757B (en) * | 1955-03-31 | 1958-08-07 | Licentia Gmbh | Arrangement for the protection of electrical measuring instruments in measuring and testing devices for serial testing of electrical devices or the like. |
| DE1100161B (en) * | 1958-11-24 | 1961-02-23 | Siemens Ag | Protection circuit for electrical measuring instruments against overload |
| DE1147312B (en) * | 1961-04-06 | 1963-04-18 | C P Goerz Electro A G | Electrical measuring device with several measuring ranges and overload protection relay |
| DE1242293B (en) * | 1964-02-01 | 1967-06-15 | Philips Nv | Device for securing electrical measuring devices for direct and alternating currents and voltages against overload |
| US4092591A (en) * | 1975-08-06 | 1978-05-30 | Lozowski Joseph F | Electric meter |
-
1951
- 1951-01-25 DE DES21676A patent/DE854824C/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE969299C (en) * | 1953-10-11 | 1958-05-22 | Standard Elek K Ag | Device for protecting a measuring circuit with crystal diodes against inrush currents |
| DE1035757B (en) * | 1955-03-31 | 1958-08-07 | Licentia Gmbh | Arrangement for the protection of electrical measuring instruments in measuring and testing devices for serial testing of electrical devices or the like. |
| DE1100161B (en) * | 1958-11-24 | 1961-02-23 | Siemens Ag | Protection circuit for electrical measuring instruments against overload |
| DE1147312B (en) * | 1961-04-06 | 1963-04-18 | C P Goerz Electro A G | Electrical measuring device with several measuring ranges and overload protection relay |
| DE1242293B (en) * | 1964-02-01 | 1967-06-15 | Philips Nv | Device for securing electrical measuring devices for direct and alternating currents and voltages against overload |
| US4092591A (en) * | 1975-08-06 | 1978-05-30 | Lozowski Joseph F | Electric meter |
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