DE2112326A1 - Unipolar current transformer for highly sensitive differential relays - Google Patents
Unipolar current transformer for highly sensitive differential relaysInfo
- Publication number
- DE2112326A1 DE2112326A1 DE19712112326 DE2112326A DE2112326A1 DE 2112326 A1 DE2112326 A1 DE 2112326A1 DE 19712112326 DE19712112326 DE 19712112326 DE 2112326 A DE2112326 A DE 2112326A DE 2112326 A1 DE2112326 A1 DE 2112326A1
- Authority
- DE
- Germany
- Prior art keywords
- current transformer
- transformer according
- circuit
- current
- differential relay
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
- H01F38/32—Circuit arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
- H01F27/422—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers
- H01F27/427—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers for current transformers
-
- 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
- H02H3/34—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 of a three-phase system
- H02H3/347—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 of a three-phase system using summation current transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Protection Of Transformers (AREA)
- Transformers For Measuring Instruments (AREA)
Description
8 München 2, Rosental 7, 2.Aufg. 8 Munich 2, Rosental 7, 2nd ed.
T*i.-Adr. Lelnpat MOndran T.l.fon (QSH) 2MSW T * i.-addr. Lelnpat MOndran Tlfon (QSH) 2MSW
Poitichedc-Konto: München 22045Poitichedc account: Munich 22045
den 15. März 1971March 15, 1971
Erb/Sd/ F 4655-61Erb / Sd / F 4655-61
SOCIETE D'APPAHEILLAGE ELECTRIQUE SAPAEEL SAHT MARCELLIIi (Isere)/i'rankreichSOCIETE D'APPAHEILLAGE ELECTRIQUE SAPAEEL SEE MARCELLIIi (Isere) / France
Unipolarer Stromwandler für hochempfindliche Differentialrelais Unipolar current transformer for highly sensitive differential relays
Die Erfindung betrifft einen unipolaren Stromwandler für hochempfindliche Differentialrelais.The invention relates to a unipolar current transformer for highly sensitive differential relays.
Um eine hohe Empfindlichkeit des Differentialrelais zu erreichen, muß für den Magnetkern des unipolaren Stromwandlers ein Werkstoff mit großer Permeabilität benutzt werden. Ein derartiger Werkstoff sättigt sich jedoch schnell und kann durch einen Nullstrom unipolaren Stroms, der größer als sein Sättigungsstrom ist, einen Restmagnetismus erhalten, der die Empfindlichkeit des Stromwandlers und damit der gesamten Schutzeinrichtung stark vermindert.In order to achieve high sensitivity of the differential relay, the magnetic core of the unipolar current transformer must be used a material with high permeability can be used. However, such a material saturates quickly and can obtain residual magnetism through a zero current of unipolar current that is greater than its saturation current, which greatly reduces the sensitivity of the current transformer and thus of the entire protective device.
Ziel der Erfindung ist es, diesen Nachteil zu vermeiden.The aim of the invention is to avoid this disadvantage.
Zu diesem Zweck ist der erfindurigsgemäße unipolare Stromwandler für ein hochempfindliches, eint Unterbrechervorrichtung betätigendes ^ifferentialrelais gekennzeichnetFor this purpose, the inventive is unipolar Current transformer for a highly sensitive, single breaker device actuating ^ ifferentialrelais marked
109840/1244 " 2 "109840/1244 " 2 "
durch einen Entmagnetisierungskreis, der durch Einwirkung der Auslösung d^s^dem Stromwandler gespeisten Differentialrelais mit den Kontakten dessen Sekundärseite automatisch verbindbar ist.through a degaussing circuit, which by action the tripping of the differential relay fed to the current transformer with the contacts whose secondary side can be automatically connected.
Weitere Einzelheiten der Erfindung ergeben sich aus . der folgenden Beschreibung von Ausführungsbeispielen, wobei auf die beiliegende Zeichnung bezug genommen wird. Auf dieser Zeichnung zeigen die Fig. 1 bis 4 jewils eine Ausführungsform des erfindungsgemäßen Stromwandlers.Further details of the invention emerge from. the following description of exemplary embodiments, reference being made to the accompanying drawings. On this 1 to 4 each show an embodiment of the current transformer according to the invention.
Jede Fig. zeigt einen unipolaren Stromwandler 1, der in der zu überwachenden elektrischen Leitung angeordnet ist. Seine Sekundärseite 2 speist ein Differentialrelais 3, das eine hinter dem Stromwandler 1 angeordnete Unterbrechervorrichtung 20 betätigt.Each figure shows a unipolar current transformer 1 which is arranged in the electrical line to be monitored. Its secondary side 2 feeds a differential relay 3, which is an interrupter device arranged behind the current transformer 1 20 actuated.
Zur wirksamen Entmagnetisierung des Transformatorkerns muß dieser dem Magnetfeld eines Wechselstroms abnehmender Amplitude ausgesetzt werden. Erfindungsgemäß wird ein derartiger Strom von einem Entmagnetisierungskreis geliefert, der an die Pole der Sekundärwicklung 2 des Stromwandlers 1 über einen Umschalter angeschlossen ist, der durch die Auslösung des Differentialrelais 3 betätigt wird. Dieser Umschalter wird von zusätzlichen, gegebenenfalls verzögerten Kontakten der Unterbrechervorrichtung 20 oder von den Kontakten eines hinter der Unterbrechervorrichtung 20 vom Netz gespeisten Jielais gebildet.For the transformer core to be effectively demagnetized, it must be subjected to the magnetic field of an alternating current as it decreases Amplitude. According to the invention, such a current is supplied by a degaussing circuit, which is connected to the poles of the secondary winding 2 of the current transformer 1 via a changeover switch, which is triggered by the of the differential relay 3 is actuated. This changeover switch is made up of additional, possibly delayed contacts the interrupter device 20 or from the contacts of a downstream of the interrupter device 20 from the network Jielais formed.
- 3 109840/1244 - 3 109840/1244
Bei der auf Fig. 1 dargestellten Ausführungsform besteht der Entmagnetisierungskreis aus einer Wechselstromquelle 4, die mit einem Yfiderstand 5 mit hohem positivem Temperaturkoeffizienten (CTP) in Reihe geschaltet ist. Der Entmagnetisierungskreis ist mit den Anschlüssen der Sekundärseite 2 über einen Umschalter verbunden, von dem nur die Kontakte 6 dargestellt sind. Dieser Umschalter verbindet die Sekundärseite 2 entweder mit dem Differentialrelais 3 oder mit dem Entmagnetisierungskreis und wird durch die Auslösung des Differentialrelais betätigt.In the embodiment shown in FIG. 1, the degaussing circuit consists of an alternating current source 4, those with a Yf resistance 5 with high positive Temperature coefficient (CTP) is connected in series. The degaussing circuit is with the connections on the secondary side 2 connected via a changeover switch, of which only the contacts 6 are shown. This switch connects the Secondary side 2 either with the differential relay 3 or with the degaussing circuit and is actuated by the triggering of the differential relay.
Fig. 2 zeigt eine abgewandelte Ausführungsform, bei welcher der Entmagnetisierungskreis aus einer Wechselstromquelle 4 besteht, zu der ein Widerstand 7 mit hohem negativem Temperaturkoeffizienten (GTM) parallel geschaltet ist. Die Sekundärseite 2 wird mit dem Differentialrelais 3 oder dem Entmagnetisierungskreis durch einen Umschalter verbunden, von dem nur die Kontakte 8 und 9 dargestellt sind.Fig. 2 shows a modified embodiment, in which the degaussing circuit from an alternating current source 4, to which a resistor 7 with a high negative temperature coefficient (GTM) is connected in parallel. the Secondary side 2 is connected to the differential relay 3 or the Degaussing circuit connected by a changeover switch, of which only contacts 8 and 9 are shown.
Bei der auf Fig. 3 dargestellten abgewandelten Ausführungsform besteht der Entmagnetisierungskreis aus einer Wechselstromquelle, die mit einer Gleichrichterbrücke 11 in Reihe geschaltet ist. An die Gleichstromanschlüsse dieser Gleichrichterbrücke 11 ist ein Kondensator 12 angeschlossen. Zu dem Kondensator 12 kann über einen Unterbrecher 15 ein Widerstand 14 zur Entladung des Kondensators 12 nach jeder Entmagnetisierung parallel geschaltet werden. Durch Verwendung eines Widerstandes 14 von ausreichend hohem Wert kann derIn the modified embodiment shown in FIG the degaussing circuit consists of an alternating current source connected to a rectifier bridge 11 in Is connected in series. A capacitor 12 is connected to the direct current connections of this rectifier bridge 11. A resistor can be connected to the capacitor 12 via an interrupter 15 14 can be connected in parallel to discharge the capacitor 12 after each demagnetization. By using a resistor 14 of sufficiently high value can
- 4 109840/1244 - 4 109840/1244
Unterbrecher 15 auch wegfallen. Der Entmagnetisierungskreis ist über einen Umschalter angeschlossen, von dem die Kontaicte 13 dargestellt sind.Breaker 15 can also be omitted. The degaussing circuit is connected via a changeover switch, from which the contaicte 13 are shown.
Wie auch in den beiden vorhergehenden Fällen kann die V/echs el Stromquelle auch aus zwei aktiven Leitern der Leitung, beispielsweise einer Phase und der liullphase bestehen, wobei sich der Anschluß vor der Unterbrechervorrichtung 20 befindet.As in the two previous cases, the V / echs el power source can also consist of two active conductors of the line, For example, one phase and the liull phase exist, the connection being located in front of the interrupter device 20.
Bei der auf Fig. 4 dargestellten Ausführungsform wird zur Entmagnetisierung des Kerns des Stromwandlers 1 die Entladung eines Kondensators 16 in einen Schwingkreis benutzt, der aus diesem Kondensator 16, der Sekundärseite 2 und einer zusätzlichen Induktanz 17 besteht. Die Induktanz 17 ist so gewählt, daß der Entladestrom des Kondensators nach etwa zehn : Perioden Hull ist. Bei normalem Betrieb wird der Kondensator hinter dec Unterbrechervorrichtung 20 vom Netz aus üDer den ' Gleichrichter 18 gespeist. Wenn das Differentialrelais in Betrieb war, entlädt sich der Kondensator 16 über den Umschalter 19 in den Kreis 16-17-2.In the embodiment shown in FIG. 4, the discharge of a capacitor 16 into an oscillating circuit, which consists of this capacitor 16, the secondary side 2 and an additional inductance 17, is used to demagnetize the core of the current transformer 1. The inductance 17 is selected so that the discharge current of the capacitor of about ten: Hull periods is. In normal operation the capacitor is fed to the 'rectifier 18 behind dec breaker device 20 from the network üThe. If the differential relay was in operation, the capacitor 16 discharges through the switch 19 in the circuit 16-17-2.
Auf Fig. A ist eine mögliche Ausführungsform des zur ; Verbindung der Sekundärseite 2 mit dem Differentialrelais 3 ode-r dem Entmagnetisierungskreis dienenden Umschalters dargestellt, die auch in den auf Fig. 1 bis 3 dargestellten Auüführungsformen anwendbar ist.On Fig. A is a possible embodiment of the for ; Connection of the secondary side 2 to the differential relay 3 or the changeover switch serving the demagnetization circuit shown, which can also be used in the embodiments shown in FIGS.
Dieser Umschalter besteht aus einem Relais, dessenThis switch consists of a relay whose
Spule hinter der Unterbrechervorrichtung· 20 mit zwei aktiven ;Coil behind the interrupter device · 20 with two active;
Leitern der Leitung verbunden ist. Der Umschalter kann ebenfalls aus zusätzlichen, ggfls. verzögerten Kontakten der Unterbreciiervorriclituü£ 2Q bestehen. . . . - lj - Conductors of the line is connected. The switch can also consist of additional, if necessary. there are delayed contacts of the subordinate precedent. . . . - l j -
109840/1MA109840 / 1MA
Claims (8)
Patentansprüche :_ 5 -
Patent claims:
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7009286A FR2081183A1 (en) | 1970-03-16 | 1970-03-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2112326A1 true DE2112326A1 (en) | 1971-09-30 |
Family
ID=9052292
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19712112326 Pending DE2112326A1 (en) | 1970-03-16 | 1971-03-15 | Unipolar current transformer for highly sensitive differential relays |
Country Status (6)
Country | Link |
---|---|
BE (1) | BE763766A (en) |
DE (1) | DE2112326A1 (en) |
ES (1) | ES389199A1 (en) |
FR (1) | FR2081183A1 (en) |
GB (1) | GB1309972A (en) |
NL (1) | NL7103097A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0226111D0 (en) * | 2002-11-08 | 2002-12-18 | Delta Electrical Ltd | Residual current devices |
WO2019220022A1 (en) * | 2018-05-16 | 2019-11-21 | Hager-Electro Sas | Electrical differential switching device |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR946815A (en) * | 1947-05-14 | 1949-06-15 | Device for demagnetizing iron or steel parts | |
FR1235318A (en) * | 1957-08-10 | 1960-07-08 | Remanent contactor or circuit breaker fitted with a differential relay |
-
1970
- 1970-03-16 FR FR7009286A patent/FR2081183A1/fr not_active Withdrawn
-
1971
- 1971-03-04 BE BE763766A patent/BE763766A/en unknown
- 1971-03-09 NL NL7103097A patent/NL7103097A/xx unknown
- 1971-03-13 ES ES389199A patent/ES389199A1/en not_active Expired
- 1971-03-15 DE DE19712112326 patent/DE2112326A1/en active Pending
- 1971-04-19 GB GB2411671A patent/GB1309972A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB1309972A (en) | 1973-03-14 |
ES389199A1 (en) | 1974-05-01 |
FR2081183A1 (en) | 1971-12-03 |
NL7103097A (en) | 1971-09-20 |
BE763766A (en) | 1971-09-06 |
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