EP1243012B1 - Ground fault circuit breaker - Google Patents
Ground fault circuit breaker Download PDFInfo
- Publication number
- EP1243012B1 EP1243012B1 EP00977536A EP00977536A EP1243012B1 EP 1243012 B1 EP1243012 B1 EP 1243012B1 EP 00977536 A EP00977536 A EP 00977536A EP 00977536 A EP00977536 A EP 00977536A EP 1243012 B1 EP1243012 B1 EP 1243012B1
- 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.)
- Expired - Lifetime
Links
- 239000004020 conductor Substances 0.000 claims abstract description 18
- 230000008901 benefit Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Images
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, according to the preamble of claim 1, as known from EP-A-0 649 158, 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.
- FIG. 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.
- In output from the block 10 there are 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 provides higher safety and reliability than the prior art.
- Another object of the present invention is to provide a device for interrupting and protecting a load supply circuit against ground faults which is more compact than known devices.
- 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:
- 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 can 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 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.
- Another advantage of the device according to the invention is that the elimination of a series of connecting terminals provides an overall increase in the reliability and safety of the power supply circuit as a whole.
- 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.
- the materials used may be any according to the requirements and the state of the art.
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Generators And Motors (AREA)
Abstract
Description
- 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.
Claims (7)
- A device for interrupting and protecting a load supply circuit against ground faults, comprising:an interruption unit (11) which has input terminals (12, 18) for connection to a load (14) supply circuit, and at least one fixed contact (15) and one moving contact (16) which are operatively connected to actuation means (17) for opening/closing said power supply circuit;a residual-current protection unit (20), operatively associated with the interruption unit (11) and comprising 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 detected residual current is higher than a preset limit and to cause, in this case, the intervention of said actuation means (17);
characterized in that with respect to a front view of the interruption unit (11) the current sensor (21) is installed transversely to a longitudinal axis which is directed along the line that connects the input and output connection terminals (12, 18) of said interruption unit (11). - The interruption and protection device according to claim 1, characterized in that said current sensor (21) comprises a substantially elliptical annular body.
- The interruption and protection device according to claim 1, characterized in that with respect to a front view of the interruption unit, the current sensor (21) is arranged below said interruption unit (11).
- The interruption and protection device according to claim 1, characterized in that with respect to a front view of the interruption unit (11) the control unit (21) is laterally adjacent to said interruption unit (11).
- The interruption and protection device according to one of the preceding claims, characterized in that said control unit (11) comprises a digital electronic unit.
- The interruption and protection device according to one of claims 1 to 4, characterized in that said control unit (22) comprises an analog electronic unit.
- An electrical power distribution panel, comprising a plurality of electrical devices connected to a power supply circuit, characterized in that it comprises at least one interruption and protection device according to one or more of claims 1 to 6.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI992609 | 1999-12-16 | ||
IT1999MI002609A IT1313953B1 (en) | 1999-12-16 | 1999-12-16 | DEVICE FOR INTERRUPTION AND PROTECTION OF A LOAD CIRCUIT FOR LOAD AGAINST GROUND TROUBLES. |
PCT/EP2000/011231 WO2001045128A1 (en) | 1999-12-16 | 2000-11-03 | Ground fault circuit breaker |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1243012A1 EP1243012A1 (en) | 2002-09-25 |
EP1243012B1 true EP1243012B1 (en) | 2004-01-02 |
Family
ID=11384118
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00977536A Expired - Lifetime EP1243012B1 (en) | 1999-12-16 | 2000-11-03 | Ground fault circuit breaker |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1243012B1 (en) |
AT (1) | ATE257275T1 (en) |
AU (1) | AU1521301A (en) |
DE (1) | DE60007557T2 (en) |
ES (1) | ES2213630T3 (en) |
IT (1) | IT1313953B1 (en) |
WO (1) | WO2001045128A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITBG20030033A1 (en) * | 2003-05-20 | 2004-11-21 | Abb Service Srl | ELECTRIC PROTECTION DEVICE AGAINST DIFFERENTIAL CURRENTS. |
IES20070390A2 (en) * | 2007-05-30 | 2008-03-19 | Tripco Ltd | A residual current device |
Family Cites Families (7)
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 (en) * | 1981-03-05 | 1982-09-16 | Siemens AG, 1000 Berlin und 8000 München | "CIRCUIT BREAKER WITH TOTAL CURRENT ACCESSIBLE FROM THE OUTSIDE" |
DE8330864U1 (en) * | 1983-10-27 | 1987-01-15 | Brown, Boveri & Cie Ag, 6800 Mannheim | Installation circuit breaker |
JPH03210726A (en) * | 1990-01-12 | 1991-09-13 | Mitsubishi Electric Corp | Circuit breaker with wiring for electric leakage alarm function |
JPH05114522A (en) * | 1991-04-02 | 1993-05-07 | Nippon Kinzoku Co Ltd | Zero phase current transformer |
FR2711449B1 (en) * | 1993-10-18 | 1995-12-22 | Merlin Gerin | Differential protection block with cable passage. |
US5652420A (en) * | 1995-11-14 | 1997-07-29 | Eaton Corporation | Modular contactor control system |
-
1999
- 1999-12-16 IT IT1999MI002609A patent/IT1313953B1/en active
-
2000
- 2000-11-03 ES ES00977536T patent/ES2213630T3/en not_active Expired - Lifetime
- 2000-11-03 EP EP00977536A patent/EP1243012B1/en not_active Expired - Lifetime
- 2000-11-03 AU AU15213/01A patent/AU1521301A/en not_active Abandoned
- 2000-11-03 AT AT00977536T patent/ATE257275T1/en not_active IP Right Cessation
- 2000-11-03 DE DE60007557T patent/DE60007557T2/en not_active Expired - Lifetime
- 2000-11-03 WO PCT/EP2000/011231 patent/WO2001045128A1/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
IT1313953B1 (en) | 2002-09-26 |
ITMI992609A0 (en) | 1999-12-16 |
WO2001045128A1 (en) | 2001-06-21 |
ATE257275T1 (en) | 2004-01-15 |
DE60007557T2 (en) | 2004-12-16 |
EP1243012A1 (en) | 2002-09-25 |
DE60007557D1 (en) | 2004-02-05 |
AU1521301A (en) | 2001-06-25 |
ITMI992609A1 (en) | 2001-06-16 |
ES2213630T3 (en) | 2004-09-01 |
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