DE510589C - Device for checking the compensation of the earth fault current achieved by earth fault coils - Google Patents
Device for checking the compensation of the earth fault current achieved by earth fault coilsInfo
- Publication number
- DE510589C DE510589C DEA56919D DEA0056919D DE510589C DE 510589 C DE510589 C DE 510589C DE A56919 D DEA56919 D DE A56919D DE A0056919 D DEA0056919 D DE A0056919D DE 510589 C DE510589 C DE 510589C
- Authority
- DE
- Germany
- Prior art keywords
- voltage
- earth fault
- frequency
- circuit
- compensation
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Description
Vorrichtung zum Prüfen der durch Erdschlußspulen erzielten Kompensation des Erdschlußstromes Zusatz zum Patent 498675 In dein Patent 498 675 ist eine Vorrichtung zur Prüfung der durch Erdschlußspulen erzielten Kompensation des Erdschlußstroiiies beschrieben, bei der Meßinstrumente vorge# sehen sind, die den Kompensationsgrad, d. h. das Verhältnis des im Erdschlußfalle auftretenden Spulenstronies, zum Erdschlußstroni anzeigen. Als Hilfsspannungsquelle kann hierbei eine solche von Netzfrequenz dienen.Device for testing the compensation of the ground fault current achieved by ground fault coils Addendum to Patent 498675 In patent 498 675 a device for testing the ground fault current compensation achieved by ground fault coils is described, in which measuring instruments are provided which determine the degree of compensation, i. H. show the ratio of the coil current occurring in the event of an earth fault to the earth fault current. A mains frequency can serve as an auxiliary voltage source.
Die Erfindung besteht nun in der Erkenntn,is, daß man auch eine Hilfsspanntiii.-1 mit konstanter, von der Netzspannung abweichender Frequenz verwenden kann, wenn man in den Spannungskreis des Anzeigeinstrumentes als Sperr- und Siebkreise wirkende Schwingungskreise einbaut.The invention now consists in the recognition that an auxiliary tensioning iii.-1 with a constant frequency deviating from the mains voltage, if acting as blocking and filtering circuits in the voltage circuit of the display instrument Built in oscillation circuits.
Bei Nichtvorhandensein derartiger Schwingungskreise kann es nämlich infolge von betriebsmäßigen Nullpunktverlagerungen vorkommen, daß das Meßergebnis durch die dann im Meßkreis auftretenden netzfrequenten Ströme und Spannungen gefälscht wird. Die Messung würde also nur so lange hinreichend genau sein, als die natürliche Nullpunktspannun- klein ist gegenüber der künstlich eingeführten Meßnullpunktspannung. Da nun in vielen Freileitungsnetzen die natürliche Nullpunktverlagerung infolge unsymmetrischer Kapazitäten oder Ableitungswiderständen einen beträchtlichen Wert erreichen kann, so ist es unbedingt erforderlich, sie von dem Meßinstrument fernzuhalten.In the absence of such oscillation circles, it can as a result of operational zero point shifts it can happen that the measurement result falsified by the mains-frequency currents and voltages then occurring in the measuring circuit will. The measurement would therefore only be sufficiently accurate as long as the natural one Zero point voltage is not small compared to the artificially introduced measuring zero point voltage. Since now in many overhead line networks the natural zero point shift as a result asymmetrical capacitances or leakage resistances have a considerable value can achieve, it is imperative to keep it away from the measuring instrument.
Zu diesem Zweck bildet man die gemäß der Erfindung in den Spannungskreis des Anzeigeinstrumentes eingeschalteten Schwingungskreise so aus, daß sie für die Netzfrequenz als Sperrkreis wirken. Dieser Sperrkeis stellt für die Meßfrequenz einen zusätzlichen induktiven Widerstand dar, der zur weiteren Erhöhung der Empfindlichkeit der Anordnung zweckmäßig durch einen Kondensator kompensiert wird. Die höchste Empfindlichkeit des Meßinstrumentes ist dann erreicht, wenn für die Meßfrequenz Spannungsresonanz vorhanden ist.For this purpose one forms the according to the invention in the voltage circuit of the indicating instrument switched on oscillation circuits so that they are for the Mains frequency act as a blocking circuit. This blocking circuit represents the measuring frequency an additional inductive resistor, which further increases the sensitivity the arrangement is expediently compensated by a capacitor. The highest sensitivity of the measuring instrument is reached when voltage resonance for the measuring frequency is available.
Da in dem Spannungskreis des Meßinstrumentes nach dem Patent 498 675 eine Widerstandskombination eingebaut ist, die dazu dient, eine Phasenverschiebung von go' zwischen Strom und.Spannung zu erzeugen, so kann man vorteilhaft den Sperrkreis so bemessen, daß er einen Teil dieser Widerstandskombination bildet.Since a resistor combination is built into the voltage circuit of the measuring instrument according to patent 498 675 , which is used to generate a phase shift of go 'between the current and voltage, the blocking circuit can advantageously be dimensioned so that it forms part of this resistor combination.
Wenn z. B. die Widerstandskombination nach der sogenannten Hummelschen Schaltung ausgebildet ist oder in einer dieser ähnlichen bereits vorgeschlagenen Kombination besteht, bei der an Stelle des rein Ohnischen ein kapazitiver Widerstand zu der Hintereinanderschaltung eines induktiven und Ohmschen Widerstandes -parallel gelegt ist, so dimensioni:ert; man- `den- Sperrkreis so, daß er einen Teg.Aq#.hei"di,eerL.#5chaltungen erforderlichen induktiven Widerstandes bildet, so daß ein besonderer Widerstand erspart wird.If z. B. the resistance combination according to the so-called Hummelschen Circuit is formed or already proposed in one of these similar There is a combination in which a capacitive resistance takes the place of the purely ohnical to the series connection of an inductive and an ohmic Resistance - is laid parallel, so dimensioned; man- `den- locking circuit in such a way that it has a Teg.Aq # .hei "di, eerL. # 5circuits forming the required inductive resistance, so that a special resistance is spared.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEA56919D DE510589C (en) | 1929-02-24 | 1929-02-24 | Device for checking the compensation of the earth fault current achieved by earth fault coils |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEA56919D DE510589C (en) | 1929-02-24 | 1929-02-24 | Device for checking the compensation of the earth fault current achieved by earth fault coils |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE510589C true DE510589C (en) | 1930-10-20 |
Family
ID=6940818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEA56919D Expired DE510589C (en) | 1929-02-24 | 1929-02-24 | Device for checking the compensation of the earth fault current achieved by earth fault coils |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE510589C (en) |
-
1929
- 1929-02-24 DE DEA56919D patent/DE510589C/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0048862A1 (en) | Method of measuring resistances and capacities of electronic components | |
| CH181579A (en) | Procedure for testing voltage transformers. | |
| DE510589C (en) | Device for checking the compensation of the earth fault current achieved by earth fault coils | |
| DE2002168C3 (en) | Dielectric humidity measuring device | |
| DE451185C (en) | Device for displaying frequency approximations for alternating currents | |
| DE543587C (en) | Device to compare two impedances with a certain approximation | |
| DE386707C (en) | Method for measuring the capacitance and the dielectric loss angle of capacitors and cables using the compensation principle | |
| DE495464C (en) | Device for measuring alternating voltages or for monitoring alternating current systems by means of a voltage divider, rectifier and a direct current measuring instrument or direct current relay | |
| DE373353C (en) | Isolation testing device | |
| DE688470C (en) | Current transformer testing device | |
| DE887840C (en) | Method for measuring the loss resistance or the loss angle of impedance resistors | |
| DE577880C (en) | Procedure for measuring the transmission ratio of transformers | |
| DE837138C (en) | Impedance meter | |
| DE737681C (en) | Device for testing voltage transformers | |
| DE665186C (en) | Device for testing voltage converters for their translation and angle errors by comparing them with normal converters, in which an auxiliary voltage is switched on, which is variable in terms of size and phase | |
| DE736852C (en) | Procedure for balancing an alternating current measuring bridge | |
| DE703573C (en) | Checking device for track magnets | |
| DE566101C (en) | Method for the objective measurement of the reactance of electrical circuits, in particular for the determination of a fault location in long-distance lines using alternating current | |
| DE481533C (en) | Arrangement for checking and regulating mains voltages using the difference method | |
| DE498675C (en) | Device for testing the compensation of the earth fault current achieved by earth fault coils | |
| DE704925C (en) | Device for measuring the capacitance and the loss angle of capacitor-like objects by means of a complex compensator in a bridge circuit | |
| DE561190C (en) | Method for measuring the degree of modulation of a telephony transmitter in operation | |
| DE2328087C3 (en) | Arrangement for measuring the characteristic values of an oscillator | |
| DE889943C (en) | Coil testing device | |
| DE529312C (en) | Device for simultaneous remote measurement of the individual and sum values of several measured quantities |