EP0154171A1 - Baueinheit für magnetischen Sensor für einen Fehlerstromschutzschalter - Google Patents

Baueinheit für magnetischen Sensor für einen Fehlerstromschutzschalter Download PDF

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Publication number
EP0154171A1
EP0154171A1 EP85101121A EP85101121A EP0154171A1 EP 0154171 A1 EP0154171 A1 EP 0154171A1 EP 85101121 A EP85101121 A EP 85101121A EP 85101121 A EP85101121 A EP 85101121A EP 0154171 A1 EP0154171 A1 EP 0154171A1
Authority
EP
European Patent Office
Prior art keywords
sensor
transformers
cylinder
transformer
base
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.)
Withdrawn
Application number
EP85101121A
Other languages
English (en)
French (fr)
Inventor
Robert Allan Morris
George William Kiesel
Alexander Anthony Krajewski
Paul Thomas Rajotte
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of EP0154171A1 publication Critical patent/EP0154171A1/de
Withdrawn legal-status Critical Current

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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
    • 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
    • H01F38/30—Constructions

Definitions

  • Ground fault circuit interrupting (GFCI) devices are capable of interrupting fault current in the range of 4 to 6 milliamps. Circuits for such devices are described in U.S. Patents 4,345,289 and 4,348,708, both of which are in the name of Edward K. Howell.
  • the circuits described therein basically include a current sensor or magnetics, a signal processor or electronics and an electronic switch.
  • the magnetics consist of a differential current transformer which responds to a current imbalance in the line and neutral conductors of the distribution circuit. This current imbalance is amplified by the signal processor pursuant to triggering the electronic switch and thereby complete an energization circuit for the trip solenoid.
  • the current sensor also includes a neutral excitation transformer for responding to a ground fault on the neutral conductor.
  • Amounting arrangement for the GFCI device is described in U.S. Patents 3,950,677 and 4,001,652 to Keith W. Klein et al.
  • the signal processor electronics is carried on a printed wire board and is positionally mounted and retained in one shell compartment of a GFCI receptacle casing.
  • the magnetics are positionally mounted in another shell compartment within the receptacle and are locked in place by the insertion of single turn transformer winding elements.
  • This 6FCI assembly although compact, does not readily lend to a fully automated assembly process since the magnetics contain two separate transformers which require electrical interconnection with each other as well as with the circuit electronics. To date, the electrical interconnection of the ma g netics with the electronics has accounted for a good percentage of the time involved in the GFCI assembly process.
  • the purpose of this invention is to provide a plug-in magnetic sensor module which contains both the differential current transformer and neutral excitation transformer in a single unitary structure which can be robotically pre-assembled.
  • An electromagnetic shield is provided by electrically connecting the metallic closure surrounding the sensor module with the printed wire board.
  • Metal tabs formed at the bottom of the closure serve to mechanically fasten the closure to the insulating support and to electrically connect the closure with the wire board electronics without requiring any wires.
  • the electrical interconnect arrangement of the invention for allowing plug-in of a magnetic sensor module within an automated GFCI device can be better understood by referring first to the state of the art GFCI device 10 depicted in Figure 1 and the electronics module 11 depicted in Figure 2.
  • the electronics module is described in detail in the aforementioned patents to Howell which are incorporated herein for purposes of reference.
  • the magnetics 12 consists of a differential current transformer core 13 and a neutral transformer core 14 for encircling the line and neutral conductors L, N.
  • the differential transformer secondary winding 15 and the neutral excitation transformer secondary winding 16 interconnect with an amplifier chip 17 for amplifying the ground fault currents detected and for operating an SCR and trip coil solenoid TC to open the switch contacts.
  • a plurality of discrete circuit elements such as capacitors Cl-C6 and resistors such as R 1 -R 6 are required for current limitation and noise suppression.
  • a test switch SW is used for directly connecting the trip coil solenoid through a current limiting resistor, such as R 3 , whereby the circuit between the line and neutral conductors is complete and the switch contacts are opened to test the circuit.
  • the arrangement of the electronics module 11 within the prior art GFCI device 10 is provided by means of a printed wire board 18 which carries the discrete elements such as the resistors, capacitors, SCR and the amplifier chip 17.
  • the electronics module 11 is interconnected with the magnetics 12 by means of a plurality of wires generally indicated as 19.
  • the magnetics consisting of differential current transformer 21, containing core 13 and winding 15, and neutral excitation transformer 20 containing core 14 and winding 16, are secured to the underside of a mounting platform 27.
  • the line and neutral conductors L, N connect with the magnetics 12, electronics module 11 and with the switch S W consisting of movable and fixed contacts 22, 23 supported on the mounting platform 27 by means of a pedestal 25.
  • the TC solenoid is mounted subjacent the movable and fixed contacts 22, 23 and operates to open the contacts upon the occurrence of ground fault current through either or both of the transformers.
  • Four posts 28 depending from the bottom of the mounting platform 27 provide requisite clearance between the mounting platform and the bottom cover (not shown) of the device for the printed wire board 18.
  • the GFCI magnetic sensor module 30 is assembled as depicted in Fig. 3 as follows.
  • the insulating pedestal 34 is formed with an upright insulating cylinder 33 and three formed slots 81 along the outer perimeter and one . slot 82 formed inboard from the perimeter.
  • the perimeter slots receive three corresponding tabs 80 depending from the bottom of the metallic closure 32, which tabs are bent under the pedestal to secure the closure when the module assembly is completed.
  • the fourth tab 80 is inserted through slot 82 for purposes which will be discussed in some detail below.
  • Four angular slots 83 are formed along the perimeter of pedestal 34 for receiving the secondary leads 78 connecting with the neutral transformer winding 16 toward the front of pedestal 34 and the differential transformer leads 77 connecting with the differential transformer winding 15 through the slots 83 toward the rear of the pedestal.
  • Both pairs of leads 77, 78 are wrapped and soldered to terminals 54, also provided along the perimeter of the pedestal.
  • the raised platform 84 supporting each of the terminals 54 electrically insulate the terminals from the metallic closure 32 when mounted to the pedestal.
  • the neutral winding 16 is first arranged around the insulated cylinder 33 and a first insulating disk 79 is placed over the neutral winding.
  • the differential transformer winding 15 is arranged on the first insulating disk 79 and a second insulating disk 79 is placed over the differential transformer winding to insulate the winding from the metallic closure 32.
  • the completely assembled magnetic sensor module 30 is shown in Figure 4 as viewed from the bottom with the concentric aperture 31 extending through the pedestal 34.
  • Tabs 80 are shown folded over the bottom of the pedestal within peripheral slots 81 with tab 80 extending through slot 82.
  • Four pins 55 depend vertically from the pedestal and electrically connect with the four terminals 54.
  • the neutral secondary winding leads 78 and the differential current secondary winding leads 77 are connected to the four plugs.
  • the connection between the magnetic sensor module 30 and the printed wire board 18 that carries the electronic circuitry for the GFCI device is shown in Figure 5.
  • the electrical interconnection arrangement which is inserted within the central aperture 31 after plugging the magnetic sensor module into the wire board is omitted along with the circuit elements mounted on the printed wire board for purposes of clarity.
  • the downward depending pins 56 are received within the printed wire board for electrical connection between the differential transformer and neutral transformer windings with the electronic circuit carried by the printed wire board.
  • the metallic closure tab 80 also extends into the printed wire board in order to electrically connect the closure which allows the closure to provide electromagetic shielding to the sensitive differential current and neutral secondary windings 15, 16, as indicated.
  • the magnetic sensor subassembly 29 is shown in Fig. 6 plugged into the printed wire board 18. Also shown mounted on the wire board is the trip solenoid 65 located between the line and neutral terminal screws 52, 53. The magnetic sensor module subassembly and printed wire board are placed within the GFCI case 57 and cover 66 is then positioned over the case and screws 67 are inserted through holes 68 to attach the cover to the case and complete the assembly.
  • the mechanism assembly shown generally at 62 is the subject of U.S. Patent Application 579,627 , which application is incorporated herein for purposes of reference. Details concerning the operation of the mechanism assembly can be obtained by referring to that application.
  • yoke 58 Prior to mounting the mechanism assembly within case 57, yoke 58 is attached to the case by fitting slots 59 which are formed within the yoke side rails 74 over corresponding detents 60 formed in the case. Yoke 58 has mounting screws 61 for ease in attaching the GFCI device.
  • a neutral terminal screw slot 76 and a line terminal screw slot 75 are formed on opposite sides of the case and are located such that the line terminal and neutral terminal screws 52, 53 are accessible when the printed wire board 18 and magnetic sensor module subassembly 29 are inserted within the case.
  • the completely assembled GFCI device 69 is shown in Fig. 7 with a test button 71 and a reset button 72 arranged above a single outlet receptacle 70 which extend through yoke 58. Both the line terminal screw 52, load line terminal screw 64 and ground screw 73 are conveniently accessible for electrical connection.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Breakers (AREA)
EP85101121A 1984-02-13 1985-02-04 Baueinheit für magnetischen Sensor für einen Fehlerstromschutzschalter Withdrawn EP0154171A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US57933784A 1984-02-13 1984-02-13
US579337 1984-02-13

Publications (1)

Publication Number Publication Date
EP0154171A1 true EP0154171A1 (de) 1985-09-11

Family

ID=24316494

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85101121A Withdrawn EP0154171A1 (de) 1984-02-13 1985-02-04 Baueinheit für magnetischen Sensor für einen Fehlerstromschutzschalter

Country Status (2)

Country Link
EP (1) EP0154171A1 (de)
JP (1) JPS60205939A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2580862A1 (fr) * 1985-04-22 1986-10-24 Gen Electric Module de traitement de signal pour disjoncteur de protection contre les mises accidentelles a la masse
EP0262430A1 (de) * 1986-09-29 1988-04-06 BBC Brown Boveri AG Stromwandleranordnung für Hochspannungsfreiluftanlagen
GB2179796B (en) * 1985-08-06 1990-02-21 Ashley Accessories Ltd Circuit breaker for a mains electrical accessory
EP0859395A2 (de) * 1997-02-07 1998-08-19 Siemens Aktiengesellschaft Niederspannungs-Leistungsschalter mit Wahlweise einbaubarem Messwandler

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1115819B (de) * 1960-01-18 1961-10-26 Busch Jaeger Duerener Metall Fehlerstromschutzschalter
DE1285609B (de) * 1960-10-22 1968-12-19 Busch Jaeger Duerener Metall Fehlerstromschutzschalter
US3950677A (en) * 1974-10-30 1976-04-13 General Electric Company Housing mounting arrangement for ground fault circuit interrupter
DE8011197U1 (de) * 1980-04-24 1980-07-17 Felten & Guilleaume Carlswerk Ag, 5000 Koeln Summenstromwandler für Fehlerstrom-Schutzschalter mit geschützter Sekundärwicklung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1115819B (de) * 1960-01-18 1961-10-26 Busch Jaeger Duerener Metall Fehlerstromschutzschalter
DE1285609B (de) * 1960-10-22 1968-12-19 Busch Jaeger Duerener Metall Fehlerstromschutzschalter
US3950677A (en) * 1974-10-30 1976-04-13 General Electric Company Housing mounting arrangement for ground fault circuit interrupter
DE8011197U1 (de) * 1980-04-24 1980-07-17 Felten & Guilleaume Carlswerk Ag, 5000 Koeln Summenstromwandler für Fehlerstrom-Schutzschalter mit geschützter Sekundärwicklung

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2580862A1 (fr) * 1985-04-22 1986-10-24 Gen Electric Module de traitement de signal pour disjoncteur de protection contre les mises accidentelles a la masse
GB2179796B (en) * 1985-08-06 1990-02-21 Ashley Accessories Ltd Circuit breaker for a mains electrical accessory
EP0262430A1 (de) * 1986-09-29 1988-04-06 BBC Brown Boveri AG Stromwandleranordnung für Hochspannungsfreiluftanlagen
US4794318A (en) * 1986-09-29 1988-12-27 Bbc Brown Boveri Ag Current transducer arrangement for outdoor high-voltage installations
EP0859395A2 (de) * 1997-02-07 1998-08-19 Siemens Aktiengesellschaft Niederspannungs-Leistungsschalter mit Wahlweise einbaubarem Messwandler
EP0859395A3 (de) * 1997-02-07 1999-04-14 Siemens Aktiengesellschaft Niederspannungs-Leistungsschalter mit Wahlweise einbaubarem Messwandler

Also Published As

Publication number Publication date
JPS60205939A (ja) 1985-10-17

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: RAJOTTE, PAUL THOMAS

Inventor name: MORRIS, ROBERT ALLAN

Inventor name: KIESEL, GEORGE WILLIAM

Inventor name: KRAJEWSKI, ALEXANDER ANTHONY