EP1243012A1 - Fehlerstromschutzschalter - Google Patents

Fehlerstromschutzschalter

Info

Publication number
EP1243012A1
EP1243012A1 EP00977536A EP00977536A EP1243012A1 EP 1243012 A1 EP1243012 A1 EP 1243012A1 EP 00977536 A EP00977536 A EP 00977536A EP 00977536 A EP00977536 A EP 00977536A EP 1243012 A1 EP1243012 A1 EP 1243012A1
Authority
EP
European Patent Office
Prior art keywords
interruption
unit
current
supply circuit
protection device
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.)
Granted
Application number
EP00977536A
Other languages
English (en)
French (fr)
Other versions
EP1243012B1 (de
Inventor
Renato Dosmo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Service SRL
Original Assignee
ABB Service SRL
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ABB Service SRL filed Critical ABB Service SRL
Publication of EP1243012A1 publication Critical patent/EP1243012A1/de
Application granted granted Critical
Publication of EP1243012B1 publication Critical patent/EP1243012B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection
    • H01H83/144—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection with differential transformer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/08—Terminals; Connections

Definitions

  • the present invention relates to a device for interrupting and protecting a load supply circuit against ground faults, particularly suitable for use in electric power supply lines for low- voltage industrial systems, and to an electrical panel which uses said device.
  • the present invention relates to a device for interrupting and protecting against a ground fault current which differs from known types of device in the particular arrangement and configuration of its components, according to a solution which allows to improve the operation of said device, increase its safety and optimize its installation.
  • residual-current devices are used in order to provide this type of protection; said devices are capable of directly or indirectly interrupting the flow of current in the electric circuit in which they are included when a ground fault current higher than a preset limit occurs.
  • specific relays known in the art as residual-current relays, associated with interruption devices, generally automatic circuit breakers, are used in low-voltage industrial systems for this purpose.
  • Figure 1 illustrates a typical configuration of a coupling between an automatic circuit breaker 1 and a residual-current relay 2, according to an embodiment which is well-known in the art.
  • the automatic circuit breaker 1 comprises a block 10 in which there are terminals 3 for connection with conductors 4 of a power supply circuit; fixed contacts and moving contacts are arranged inside the block 10 and can be mutually coupled/uncoupled.
  • additional terminals 5 to which conductors 6 for electrical connection to the relay 2 are connected; said conductors 6 can be constituted, for example, by copper bars or cables.
  • the relay 2 comprises a current sensor and a residual-current protection unit, not shown in the figure; in output from the relay 2 there is another series of terminals 7 for the connection of conductors 8 for supplying a load, schematically designated by the reference numeral 9 in Figure 1.
  • the current sensor comprises, according to embodiments which are well-known in the art, a magnetic core inside which the conductors 6 pass and a secondary winding across which a voltage is generated when a ground fault current is present.
  • This voltage is supplied to the protection unit, which measures its value and compares it with a threshold value; if the measured value exceeds the threshold, the protection unit determines, directly or indirectly, the opening of the circuit breaker.
  • the aim of the present invention is to provide a device for interrupting and protecting a load supply circuit against ground faults, in which the connection among the various elements occurs in a simplified manner with respect to the prior art, accordingly facilitating assembly and installation.
  • an object of the present invention is to provide a device for interrupting and protecting a load supply circuit against ground faults which reduces the number of connections to be performed, consequently reducing the number of terminals required and providing an advantage from the point of view of production.
  • Another object of the present invention is to provide a device for interrupting and protecting a load supply circuit against ground faults which allows to reduce the electrical resistance of the circuit in which it is inserted and the corresponding dissipated power.
  • Another object of the present invention is to provide a device for interrupting and protecting a load supply circuit against ground faults which is highly reliable, relatively easy to manufacture and at competitive costs.
  • a device for interrupting and protecting a load supply circuit against ground faults comprising: ⁇ an interruption unit which has input terminals for connection to a load supply circuit, and at least one fixed contact and one moving contact which are operatively connected to actuation means for opening/closing said power supply circuit; ⁇ a residual-current protection unit, operatively associated with the interruption unit and comprising a current sensor which is suitable to detect the presence of a residual current, and a control unit which is operatively associated with the sensor and with the actuation means and is suitable to check whether the detected residual current is higher than a preset limit and to cause, in this case, the intervention of said actuation means; characterized in that load supply conductors are directly connected to output terminals of the interruption unit and in that the current sensor is arranged directly on said conductors. In this manner one has the advantage of being able to eliminate at least one junction point, and therefore the corresponding terminals, in the chain for transmission of electric power to
  • Figure 1 is a schematic view of an automatic circuit breaker coupled to a residual-current relay according to a configuration which is known in the art
  • Figure 2 is a general view of an electric diagram of the interruption and protection device according to the invention
  • Figure 3 is a front view of the interruption and protection device according to the invention.
  • the expression "device for interruption and protection against a ground fault current” is used to designate any device suitable to interrupt the flow of current in a load power supply circuit when a ground fault current higher than a preset limit occurs.
  • Said device c?n be constituted, for example, by an automatic circuit breaker with which a residual-current relay is associated, and this is the embodiment to which reference is made hereinafter without intending to limit in any way the scope of application of the invention.
  • the interruption and protection device might comprise a circuit breaker associated with a residual-current block or an interruption unit which directly integrates in its structure components suitable to provide protection against residual currents.
  • the interruption and protection device comprises an interruption unit 11 which has connection terminals 12 in input to the conductors 13 of a circuit for supplying power to a load 14 which is arranged downstream; as shown schematically in Figure 2, the interruption unit 11 internally uses, for each phase of the power supply circuit, a fixed contact 15 and a moving contact 16 which are operatively connected to actuation means 17 for opening/closing the power supply circuit.
  • the device 100 furthermore comprises a residual-current protection unit 20 which is operatively associated with the interruption unit 11; said unit 20 comprises a current sensor 21 which is suitable to detect the presence of a residual current, and a control unit 22 which is operatively associated with the sensor 21 and with the actuation means 17 and is suitable to check whether the residual current detected by the sensor 21 is higher than a preset limit and to determine, in this case, the intervention of the actuation means 17.
  • a residual-current protection unit 20 which is operatively associated with the interruption unit 11; said unit 20 comprises a current sensor 21 which is suitable to detect the presence of a residual current, and a control unit 22 which is operatively associated with the sensor 21 and with the actuation means 17 and is suitable to check whether the residual current detected by the sensor 21 is higher than a preset limit and to determine, in this case, the intervention of the actuation means 17.
  • the power supply conductors for the load 14, designated by the reference numeral 19 in Figures 2 and 3, are directly connected to terminals 18 in output from the interruption unit 11, with the current sensor 21 arranged directly on said conductors 19 which constitute the primary windings.
  • the current sensor 21 has a substantially elliptical annular body on which the secondary windings 23 are arranged; said annular body is arranged transversely to a longitudinal axis which is orientated along the line that connects the input terminals 12 and the output terminals 18 of the interruption unit 11, with reference to a front view of said interruption unit 11.
  • the current sensor 21 is arranged downward with respect to the interruption unit 11, with the control unit 22 arranged laterally adjacent to said interruption unit.
  • Said control unit 22, depending on the various applications and/or specific requirements, can comprise a digital electronic unit or an analog electronic unit, with advantages as regards flexibility of application.
  • the vector sum of the currents that circulate in the conductors 19 is zero; when a ground current occurs, said vector sum is no longer zero and a voltage is induced on the secondary windings 23.
  • the value of the voltage is made available to the control unit 22, which measures it and compares it with a preset threshold value. If the measured value is higher than the threshold, the unit 22 sends a signal to the actuation means 17 so as to open the contacts.
  • the device 100 can be installed equally in secondary electrical distribution panels, with mounting on supporting guides of the DIN type, and in general distribution panels, with fitting on the door rear.
  • the present invention also relates to an electric power distribution panel which comprises a plurality of electrical devices, for example circuit breakers, which are connected to a power supply circuit, characterized in that it comprises at least one interruption and protection device according to the invention.
  • the device according to the invention fully achieves the intended aim and objects, since it allows to have a connection among the various components which is at once simple and effective, according to a solution which furthermore allows to reduce dissipated power, increase safety and reliability, and reduce the necessary space occupation.

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Protection Of Generators And Motors (AREA)
EP00977536A 1999-12-16 2000-11-03 Fehlerstromschutzschalter Expired - Lifetime EP1243012B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI992609 1999-12-16
IT1999MI002609A IT1313953B1 (it) 1999-12-16 1999-12-16 Dispositivo di interruzione e protezione di un circuito dialimentazione di un carico contro i guasti verso terra.
PCT/EP2000/011231 WO2001045128A1 (en) 1999-12-16 2000-11-03 Ground fault circuit breaker

Publications (2)

Publication Number Publication Date
EP1243012A1 true EP1243012A1 (de) 2002-09-25
EP1243012B1 EP1243012B1 (de) 2004-01-02

Family

ID=11384118

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00977536A Expired - Lifetime EP1243012B1 (de) 1999-12-16 2000-11-03 Fehlerstromschutzschalter

Country Status (7)

Country Link
EP (1) EP1243012B1 (de)
AT (1) ATE257275T1 (de)
AU (1) AU1521301A (de)
DE (1) DE60007557T2 (de)
ES (1) ES2213630T3 (de)
IT (1) IT1313953B1 (de)
WO (1) WO2001045128A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBG20030033A1 (it) * 2003-05-20 2004-11-21 Abb Service Srl Dispositivo elettrico di protezione contro correnti differenziali.
IES20070390A2 (en) * 2007-05-30 2008-03-19 Tripco Ltd A residual current device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB489650A (en) * 1937-01-30 1938-08-02 Reyrolle A & Co Ltd Improvements in or relating to electric current transformers of the core-balance type
DE3108393A1 (de) * 1981-03-05 1982-09-16 Siemens AG, 1000 Berlin und 8000 München "schutzschalter mit von aussen zugaenglichem summenstromwandler"
DE8330864U1 (de) * 1983-10-27 1987-01-15 Brown, Boveri & Cie Ag, 6800 Mannheim, De
JPH03210726A (ja) * 1990-01-12 1991-09-13 Mitsubishi Electric Corp 漏電警報機能付き配線用遮断器
JPH05114522A (ja) * 1991-04-02 1993-05-07 Nippon Kinzoku Co Ltd 零相変流器
FR2711449B1 (fr) * 1993-10-18 1995-12-22 Merlin Gerin Bloc de protection différentielle avec passage des câbles.
US5652420A (en) * 1995-11-14 1997-07-29 Eaton Corporation Modular contactor control system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0145128A1 *

Also Published As

Publication number Publication date
DE60007557D1 (de) 2004-02-05
DE60007557T2 (de) 2004-12-16
EP1243012B1 (de) 2004-01-02
ATE257275T1 (de) 2004-01-15
IT1313953B1 (it) 2002-09-26
ES2213630T3 (es) 2004-09-01
AU1521301A (en) 2001-06-25
ITMI992609A1 (it) 2001-06-16
WO2001045128A1 (en) 2001-06-21
ITMI992609A0 (it) 1999-12-16

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