DE2425080A1 - Differential current meter and processor - has a summation current transformer with at least one pair of primary windings - Google Patents
Differential current meter and processor - has a summation current transformer with at least one pair of primary windingsInfo
- Publication number
- DE2425080A1 DE2425080A1 DE19742425080 DE2425080A DE2425080A1 DE 2425080 A1 DE2425080 A1 DE 2425080A1 DE 19742425080 DE19742425080 DE 19742425080 DE 2425080 A DE2425080 A DE 2425080A DE 2425080 A1 DE2425080 A1 DE 2425080A1
- Authority
- DE
- Germany
- Prior art keywords
- primary windings
- current
- current transformer
- summation
- windings
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/10—Measuring sum, difference or ratio
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/33—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers
- H02H3/332—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers with means responsive to dc component in the fault current
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
Description
Einrichtung zum Messen und Weiterverarbeiten eines Differenzstromes Die Erfindung betrifft eine Einrichtung zum Messen und Weiterverarbeiten eines Dii'ferenzstromes mittels eines Summenstromwandlers. Device for measuring and processing a differential current The invention relates to a device for measuring and processing a differential current by means of a summation current transformer.
Bei derartigen Einrichtungen ist eine Universalität erforderlich die es ermöglicht, einen Difforenzstrorn gleich welcher Art mittels eines Summenstromwandlers zu messen und weiter zu verarbeiten, ohne daß dadurch Ungenauigkeiten in bezug auf Ansprechempfindlichkeit und eine funktionell ungünstige Bauform in Kauf genommen werden müssen. Die Einrichtung soll trotz der erforderten Genauigkeit wenig aufwendig in der Anwendung von einzelnen Funktionselementen sein, so daß diese in einem kompakten Modul vereinugt und für ein großes Anwendungsspektrum einsetzbar sind. Aus diesen Gründen müssen die den Summenstromwandler bildenden Funktionselemente so beschaffen sein, daß diese beispielsweise bei einem langzeitig anstehenden Differonzstrom keine Sättigungserscheinungen zeigen, d.h., jeglich nachteilige Beeinflussung der Einrichtung muß von vornherein ausgeschlossen sein, da nur dadurch die Gew eines ausreichenden Schutzes für das zur Anwendung kommende Gerät gegeben ist.Universality is required in such devices it enables a differential current of any kind by means of a summation current transformer to measure and further process, without thereby inaccuracies with regard to Responsiveness and a functionally unfavorable design accepted Need to become. In spite of the required accuracy, the device should not be complex be in the application of individual functional elements, so that these in a compact Module combined and can be used for a wide range of applications. From these For reasons, the functional elements forming the summation current transformer must be designed in this way be that this does not occur, for example, in the case of a long-term differential current Show signs of saturation, i.e. any adverse effect on the facility must be excluded from the outset, as this is the only way in which the weight of a sufficient Protection for the device to be used is given.
Es ist allg. ein Differenzstromwandler der eingangs genannten Art von kleiner Abmessung bekannt, durch dessen zwei Kerne die Primärleiter einfach hindurchgeführt sind. Gleichzeitig werden die zum Verbraucher führenden Phasen des Differenzstromwandlers zur Vormagnetisierung herangezogen, indem auf jeden Kern jeweils eine unabhängige Vormagnetisierungsspule mit gegensinnit gem Verlauf der Wickelrichtung angeordnet ist. Durch diese Anordnung wird erreicht, daß die beiden Flüsse in den Kernen entgegengesetzt gerichtet sind und so verhindert, daß bei einem beispielsweise langanhaltenden Gleichstromfehler der jeweilige Kern in die Sättigung getrieben wird. It is generally a differential current transformer of the type mentioned at the beginning known of small dimensions, through whose two cores the primary conductor is easy are passed through. At the same time, the phases of the Residual current transformer used for pre-magnetization by placing on each core each has an independent bias coil with opposite direction according to the course of the Winding direction is arranged. Through this arrangement is achieved, that the two rivers in the cores are directed in opposite directions and thus prevent that in the event of a long-lasting direct current fault, for example, the respective core is driven into saturation.
Der Nachteil dieser bekannten Anordnung besteht jedoch darin, daß die Netzfrequenz sich aüf den Meßkreis des Differenz stromwandlers überträgt und diesen eventuell zu einer Falschaussage veranlaßt. Daran ändert auch die richtige Werkstoffauswahl des Kerns nichts, dessen Gütewert bekanntlich aus dem Quotienten (Br/Bmax) der Remanenzinduktion (Br) und der maximalen Induktion (Bmax) gebildet wird und eine Funktion der magnetischen Feldstärke ist; dieser Quotient soll möglichst nahe bei 1 die gen. Aus den zuvor genannten Gründen soll das Maximum des Quotienten bei einer möglichst kleinen Feldstärke erreicht werden, damit bei einer geringen Windungszahl und kleinstmöglicher Bauform optimale Ergebnisse und Betrieb'C3bedingun£!en in bezug auf die Ansprechempfindlichkeit erzielbar sind.The disadvantage of this known arrangement, however, is that the mains frequency is transmitted to the measuring circuit of the differential current transformer and this may cause a false statement. That also changes the right one Material selection of the core nothing, its quality value is known from the quotient (Br / Bmax) of the remanent induction (Br) and the maximum induction (Bmax) is and is a function of magnetic field strength; this quotient should if possible close to 1 the gen. For the reasons mentioned above, the maximum of the quotient can be achieved with the smallest possible field strength, so with a low one Number of turns and the smallest possible design, optimal results and operating conditions in terms of responsiveness are achievable.
Einen derartigen Differenzstromwandler kann man zwar zur Summenstrombildung in Fehlstromschutzschaltern zur Erfassung von Gleich- und Wechselfehlerströmen einsetzen, jedoch nicht zur Referenzbildung.Such a differential current transformer can be used to generate total currents Use in residual current circuit breakers to detect DC and AC residual currents, but not for reference formation.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Einrichtung zu schaffen, die es ermöglicht, den MeB- und Referenstrom zur Summenstrombildung heranzuziehen.The invention is therefore based on the object of providing a device create that makes it possible to use the measurement and reference currents to generate the total current.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß auf dem Summenstromwandler 2n elektromagnetisch gegensinnig geschaltete Primärwicklungen angeordnet sind, welche von Strömen verschiedener, voneinander unabhängiger Stromkreise beaufscblagbar sind, die insbesondere zum Messen und zur Referenzbildung dienen derart, daß bei Summenstrombildung einzelner und/oder aller 2n Wicklungen an einer Sekundärwicklung eine Spannung induziert wird.This object is achieved according to the invention in that on the summation current transformer 2n electromagnetically oppositely connected primary windings are arranged, which can be acted upon by currents from different, independent circuits are, which are used in particular for measuring and for reference formation in such a way that with total current formation individual and / or all 2n windings induced a voltage on a secondary winding will.
Weitere Ausgestaltungen und vorteilhafte Verbesserungen der Erfindung gehen aus den Unteransprüchen hervor.Further refinements and advantageous improvements of the invention emerge from the subclaims.
Die mit der Erfindung erzielten überraschenden Vorteile bestehen darin, daß Schutz- und Sicherungsmaßnahmen sowie Regelvorgänge mit einem einzigen Summenstromwandler bei nur in geringen, jedoch zulässigen Grenzen schwankender Ansprechempfind lichkeit durchführbar sind.The surprising advantages achieved with the invention are that protection and safety measures as well as control processes with a single summation current transformer with sensitivity fluctuating only within small but permissible limits are feasible.
es ist sichergestellt, daß die Amperwindungszahlen des Neßstromes und des Referenzstromes in einem bestimmten Verhältnis stehen(Aw1 = Aw2). Be Veränderung des Referenzstromes tritt eine Veränderung des Verhältnisses zwischen Meß- und Referenzstrom ein.it is ensured that the number of ampere turns of the Neßstrom and the reference current are in a certain ratio (Aw1 = Aw2). Be change of the reference current, there is a change in the ratio between measuring and reference current a.
Die Erfindung wird nachfolgend anhand eines in der Zeichnung dargestellten Äusführungsbeispiels näher erläutert, die eine erfindungsgemäße Einrichtung in perspektivischer Darstellung zeigt.The invention is illustrated below with reference to one in the drawing Äus Ausführungsbeispiels explained in more detail that a device according to the invention in perspective Illustration shows.
Sin aus einem Kern 1 bestehender Summenstromwandler la weist eine Sekundärwicklurig 2 auf, an deren beiden Anschlüssen 2a,2b ein in seinem Aufbau bekannter Halbleiterverstärker 3 angeschaltet ist. Selbstverständlich kann statt des Halbleiterverstärkers 3 auh jeder andere bekannte Verstärker oder-gleichwirkende Funktionseinheit verwendet werden. Primärseitig sind durch den Kern 1 2n elektromagnetisch gegensinnig geschaltete Leiter 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b geführt. Werden nun die Leiter 5a bis 8b, die ihrerseits als Primärwicklungen fungieren, in entgegengesetztem Sinn von Strömen verschiedener, voneinander unabhängiger Stromkreise durchflossen, so ist die resultierende Durchflutung in der Sekundärwicklllng des Summenstromwandlers gleich der Differenz der Teildurchflutungen. Bei gleichen Beträgen der Teildurchflutung in den Primärwicklungen wird in der Sekundärwicklung 2 keine Spannung induziert, wodurch der Verstärker 3 ebenfalls im Ruhezustand verharrt.Sin from a core 1 existing summation current transformer la has a Secondary winding 2, at the two terminals 2a, 2b one in its structure known semiconductor amplifier 3 is switched on. Of course it can take place of the semiconductor amplifier 3 also any other known amplifier or equivalent Functional unit can be used. On the primary side, 1 2n are electromagnetic through the core oppositely connected conductors 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b out. Will now the conductors 5a to 8b, which in turn act as primary windings, in opposite directions Sense of currents different from each other independent circuits flowed through, the resulting flow is in the secondary winding of the Summation current transformer equal to the difference in the partial flow. With the same amounts the partial flow in the primary windings is not in the secondary winding 2 Voltage induced, whereby the amplifier 3 also remains in the idle state.
Das Anwendungsgebiet einer derartig beschriebenen Einrichtung zum Messen mad Weiterverarbeiten eines Differenzstromes ist sehr vielseitig und stellt eine umfassende Bereicherung der Elektrotechnik dar. Beispielsweise eignet sie sich hervorragend zur Überwachung der Temperatur und eventueller BerUhrungsspannungen von Elektrowärmegeräten.The field of application of a device described in this way for Measuring mad processing a differential current is very versatile and represents a comprehensive enrichment of electrical engineering. For example, it is suitable excellent for monitoring the temperature and possible contact voltages of electrical heating devices.
Claims (5)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19742425080 DE2425080A1 (en) | 1974-05-24 | 1974-05-24 | Differential current meter and processor - has a summation current transformer with at least one pair of primary windings |
| CH652675A CH592881A5 (en) | 1974-05-24 | 1975-05-21 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19742425080 DE2425080A1 (en) | 1974-05-24 | 1974-05-24 | Differential current meter and processor - has a summation current transformer with at least one pair of primary windings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE2425080A1 true DE2425080A1 (en) | 1975-12-11 |
Family
ID=5916342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19742425080 Pending DE2425080A1 (en) | 1974-05-24 | 1974-05-24 | Differential current meter and processor - has a summation current transformer with at least one pair of primary windings |
Country Status (2)
| Country | Link |
|---|---|
| CH (1) | CH592881A5 (en) |
| DE (1) | DE2425080A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3282532A1 (en) * | 2016-08-11 | 2018-02-14 | ABB Schweiz AG | An arc fault detection arrangement for a dc electric bus |
| EP3282535A1 (en) * | 2016-08-11 | 2018-02-14 | ABB Schweiz AG | An arc fault detection arrangement for a dc electric bus |
-
1974
- 1974-05-24 DE DE19742425080 patent/DE2425080A1/en active Pending
-
1975
- 1975-05-21 CH CH652675A patent/CH592881A5/xx not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3282532A1 (en) * | 2016-08-11 | 2018-02-14 | ABB Schweiz AG | An arc fault detection arrangement for a dc electric bus |
| EP3282535A1 (en) * | 2016-08-11 | 2018-02-14 | ABB Schweiz AG | An arc fault detection arrangement for a dc electric bus |
| US10673224B2 (en) | 2016-08-11 | 2020-06-02 | Abb Schweiz Ag | Arc fault detection arrangement for a DC electric bus |
| US10673223B2 (en) | 2016-08-11 | 2020-06-02 | Abb Schweiz Ag | Arc fault detection arrangement for a DC electric bus |
Also Published As
| Publication number | Publication date |
|---|---|
| CH592881A5 (en) | 1977-11-15 |
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