EP2486578B1 - Rcbo triphasé - Google Patents

Rcbo triphasé Download PDF

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Publication number
EP2486578B1
EP2486578B1 EP10821485.9A EP10821485A EP2486578B1 EP 2486578 B1 EP2486578 B1 EP 2486578B1 EP 10821485 A EP10821485 A EP 10821485A EP 2486578 B1 EP2486578 B1 EP 2486578B1
Authority
EP
European Patent Office
Prior art keywords
rcbo
linkage
phase
actuator
circuit
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.)
Active
Application number
EP10821485.9A
Other languages
German (de)
English (en)
Other versions
EP2486578A4 (fr
EP2486578A1 (fr
Inventor
Stephen James Woolley
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.)
Industrics Pty Ltd
Original Assignee
Industrics Pty Ltd
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
Priority claimed from AU2009904882A external-priority patent/AU2009904882A0/en
Application filed by Industrics Pty Ltd filed Critical Industrics Pty Ltd
Publication of EP2486578A1 publication Critical patent/EP2486578A1/fr
Publication of EP2486578A4 publication Critical patent/EP2486578A4/fr
Application granted granted Critical
Publication of EP2486578B1 publication Critical patent/EP2486578B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
    • H01H83/22—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages
    • H01H83/226—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages 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
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/123—Automatic release mechanisms with or without manual release using a solid-state trip unit
    • H01H71/125—Automatic release mechanisms with or without manual release using a solid-state trip unit characterised by sensing elements, e.g. current transformers
    • 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
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/025—Constructional details of housings or casings not concerning the mounting or assembly of the different internal parts
    • 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
    • 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
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2409—Electromagnetic mechanisms combined with an electromagnetic current limiting mechanism

Definitions

  • This invention relates to a 3 phase RCBO (Residual Current Breaker with Overload), in particular a 3 phase RCBO that is only 3 DIN modules wide.
  • 3 phase RCBO Residual Current Breaker with Overload
  • circuit breakers typically employ both circuit breakers and residual current devices (RCDs) to protect against over-current and earth leakage faults respectively.
  • RCDs residual current devices
  • RCBOs Residual Current Breakers with Overload
  • These RCBOs are invariably 4 DIN modules wide, switching all 3 phases and neutral. Such an arrangement is unsuitable for use in chassis type switchboards as the 3 phase chassis busbar fingers would collide with the neutral input terminal, and the wide casing would make its use unsuitable in some general switchboard installations.
  • a 4 DIN wide module is also not suitable as a drop in replacement for a circuit breaker when the extra protection of an RCD is wanted.
  • US 5 089 796 A discloses a Residual Current Breaker with Overload (RCBO) according to the preamble of claim 1.
  • RCBOs can also present problems when insulation testing due to their internal electronics.
  • the electronics give rise to low insulation readings or can even be damaged during the testing procedure.
  • the electronics in an RCBO need to be isolated by removal or some form of physical isolation during testing. Neither of these options is convenient.
  • the object of this invention is to provide an RCBO that alleviates the above problems, or at least provides the public with a useful alternative.
  • the RCBO 10 of the present invention shares many features with prior art RCBOs, circuit breakers and RCDs. These features are well understood by those familiar with the art so are not described in depth in the following description
  • FIGS 1A and 1B show front and rear perspective views of an RCBO 10 according to a preferred embodiment of the invention.
  • the RCBO 10 has the physical appearance of a conventional 3 phase circuit breaker, and in particular is 3 DIN modules wide as per a conventional 3 phase circuit breaker.
  • the width of the RCBO 10 distinguishes it from prior art RCBOs which are typically 4 DIN modules wide. This allows the RCBO 10 to be used in switchboards with limited space and is particularly suited as a replacement for a circuit breaker when the added functionality of an RCBO is desired.
  • the external physical features of the RCBO 10 are a casing 15 with first end 16 and a second end 17.
  • the first end 16 includes 3 phase inputs 20.
  • the second end 17 includes 3 phase outputs 21, neutral input 22 and neutral output 23. All of the inputs and outputs are of the screw cage clamp variety with access to the screws of the clamps provided by screw access holes 24.
  • the RCBO 10 is turned ON or OFF by actuator lever 25. The state of the RCBO 10 is shown by On/Off indicators 26.
  • the 3 phase inputs 20 and 3 phase outputs 21 can be interchanged between line and load connections as required without affecting the operation of the RCBO.
  • the RCBO 10 does not switch the neutral circuit. This abrogates the need for a considerable amount of components, allowing the RCBO 10 to assume its narrow width.
  • RCBO 10 Having both neutral input 22 and neutral output 23 at the same end of the RCBO 10 allows the RCBO to be only 3 DIN modules wide and suitable for use in chassis type switchboards or connected to a 3 phase busbar as the 3 phase chassis busbar fingers would not collide with either of the neutral connections.
  • the remaining description describes the features of the RCBO 10 according to two separate embodiments, an electronic RCBO 11 and a mechanical RCBO 12. Both embodiments have many features in common, in particular the same external configuration as a result of not switching the neutral circuit. The description will cover the electronic RCBO 11 in detail followed by the differences in the mechanical embodiment.
  • the RCBO 10 Whilst the RCBO 10, in both of its embodiments, is intended for three phase operation it will operate equally as well with only a single phase present. Where convenient the figures only show items associated with one of the phases and items shared amongst the three phases. The operation of each of the three phases is to all intents and purposes identical. As with conventional 3 phase devices, the three phases are mechanically interlocked so that they operate in unison. The actuator lever 25 for instance operates on all three phases. Likewise the trip mechanisms for each phase are interlocked. A fault detected on any phase will cause all 3 phases to trip.
  • FIGS 2 and 3 show cut-away views of an electronic RCBO 11 in the OFF state and ON state respectively, whilst figure 4 shows a schematic diagram of the electromechanical circuit 60 of the RCBO 11.
  • the RCBO 11 comprises an actuator lever 25 pivotally mounted on a lever pivot 30 and an actuator mechanism 32 in conjunction with a trip cam 36 pivotally mounted on an actuator pivot 33.
  • an actuator linkage 32 connected to the actuator lever 25 pushes the actuator mechanism 32 about the actuator pivot 33, bringing contacts 34 together thus making an electrical circuit between a phase input 20 and a phase output 21.
  • the actuator linkage 31 works against a torsion spring (not shown).
  • the spring is arranged such that when the proximal end 37 of the actuator linkage 31 is above the line between the lever pivot 30 and the distal end 38 of the actuator linkage 31 the spring will keep actuator linkage 31 in the ON position and when proximal end 37 moves below the line the spring will return the actuator linkage 31 to the OFF position.
  • any small movement of the actuator mechanism 32 or the trip cam 36 will trip the mechanism thus returning it to the OFF position and break the electrical circuit between the phase input 20 and the phase output 21.
  • the first protection provided by the RCBO 11 is overload protection (also known as thermal protection) provided by a bi-metallic strip 42 which deforms with an increase in temperature resultant from the current flow through it.
  • overload protection also known as thermal protection
  • the bi-metallic strip operates the trip cam 36 through overload linkage 43, thus resetting the RCBO 11.
  • Calibration screw 48 provides adjustment for the current required to activate the overload protection.
  • the RCBO 11 also provides short circuit protection (also known as magnetic trip protection) via short circuit solenoid 39. Part of the electrical circuit between the phase input 20 and the phase output 21 makes up the coil of the short circuit solenoid 39. In response to a short circuit current the short circuit solenoid 39 will fire a pin 40 that operates the trip cam 36, thus resetting the RCBO 11.
  • short circuit protection also known as magnetic trip protection
  • the third form of protection provided by the RCBO 11 is Residual Current Protection (also known as Earth Leakage Protection) via residual current protection circuit (RCPC) 61.
  • the RCPC 61 incorporates a sense transformer 52 comprising a toroidal coil through which the neutral and 3 phase circuits pass to form a primary winding.
  • the transformer detects the net three phase current in the circuits which is reflected in a secondary winding 53.
  • the net three phase current of all the conductors will equal 0A.
  • the current flowing in a conductor in one direction will return back through the other conductors, thereby creating a cancelling effect to the overall sensed current values.
  • the circuitry will detect no out of balance currents because no current will be induced into the sense transformer 52.
  • the current flows through a phase then returns through another path (Earth Return etc.) and does not return back through the sense transformer 52.
  • the current in the secondary winding 53 of the sense transformer 52 will then be a measure of the earth fault current. This current is monitored by an IC 64 and if the fault current exceeds a threshold of 30mA the IC 64 will turn on SCR 66 and activate trip solenoid 68, firing a pin 70 that operates the trip cam 36, thus resetting the RCBO 11.
  • DC power for the RCPC 61 is derived from the 3 phase circuits via bridge rectifier 62, only one phase needs to be present to provide power.
  • Optional electrical isolation from the 3 phase is achieved by the use of capacitors 67 connected in series with the bridge rectifier 62 and trip solenoids 68.
  • the residual current protection can be tested by pressing test switch 28. Pressing switch 28 completes a circuit through bleed resistor 54 in which the current bypasses sense transformer 52. This results in a net 3 phase current through sense transformer 52 thus simulating a residual current fault which should be detected by the RCPC 61 resulting in the resetting of the RCBO 11.
  • a mechanical RCBO 12 employing electromechanical means as opposed to electronic means to implement RCD functionality.
  • the general construction and operation of the electronic RCBO12 is the same as the electronic RCBO 11. The following discussion will largely focus on where the two embodiments differ from each other.
  • Figure 5 is a schematic of the electromechanical circuit 80 of a mechanical RCBO 12. The circuit is similar to the electromechanical circuit 60 of the electronic RCBO 11 as shown in figure 4 .
  • Figures 6 and 7 show cut-away views of the mechanical RCBO 12 in the OFF state and ON state respectively,
  • an earth fault current is detected from the net three phase current passing through sense transformer 52.
  • the secondary winding 53 of the transformer 52 is not connected to an electronic sensing circuit, but to an electromechanical actuator in the form of a magnetic relay 82.
  • the power induced by an earth fault current in the secondary winding 53 is enough to trigger the magnetic relay 82 which pushes the trip linkage 50 which in turn pushes the overload linkage 43 to operate the trip cam 36, thus resetting the RCBO 12.
  • the energy required to reset the magnetic relay 82 is provided by the energy stored in the off return spring of the actuator lever 25 when the RCBO 12 is switched from the OFF state to the ON state.
  • the energy is transferred to the magnetic relay 82 via magnetic relay reset linkage 86 and trip linkage 50 when the RCBO switches from the ON state to the OFF state.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Breakers (AREA)

Claims (3)

  1. Coupe-circuit de courant résiduel à surcharge, RCBO, comprenant :
    un circuit d'au moins une phase (20, 21) ;
    un circuit neutre (22) ;
    un tore de sens de courant (52) à travers lequel le circuit d'au moins une phase (21) et le circuit neutre (22) passent afin de former un bobinage primaire ;
    des moyens de contact (34) afin de construire ou d'interrompre au moins le circuit d'au moins une phase (20, 21) ;
    un levier actionneur chargé par ressort (25) en vue d'exploiter les moyens de contact (34) via une liaison d'actionneur (31) et un mécanisme d'actionneur (32) avec liaison de surcharge (43) ;
    un relais magnétique (82) avec deux terminaux d'entrée de déclenchement ;
    une liaison de déclencheur (50) mettant en prise de manière coulissante le relais magnétique (82) et le mécanisme d'actionneur (32) ;
    un bobinage secondaire (53) sur ledit tore de sens (52) connecté audit relais magnétique (82) des terminaux d'entrée de déclenchement ; et
    lorsqu'un déséquilibre de courant entre le circuit d'au moins une phase (20, 21) et le circuit neutre (22) existe, du courant est induit dans le bobinage secondaire (53) via le tore de sens (52) suffisant pour déclencher le relais magnétique (82) afin de relâcher l'énergie potentielle élastique stockée dans un ressort à l'intérieur du relais magnétique (82) afin de livrer la liaison de déclencheur (50) avec une énergie cinétique suffisante pour déclencher la liaison de surcharge (43) du mécanisme d'actionneur (32) et interrompre les moyens de contact (34), caractérisé en ce que le RCBO comprend une liaison de réinitialisation (86) connectée à un embout proximal du levier actionneur (25) et à un embout distal mettant en prise de manière coulissante la liaison de déclencheur (50), dans lequel :
    lorsque le RCBO est commuté d'un état d'arrêt à un état de marche au moyen du levier actionneur (25), l'énergie potentielle élastique est stockée dans le ressort du levier actionneur (25) ; et
    lorsque le RCBO est déclenché de l'état de marche à l'état d'arrêt, le potentiel élastique du levier actionneur (25) est converti en énergie cinétique de la liaison de réinitialisation (86) et de la liaison de déclencheur (50), qui à son tour est convertie en énergie potentielle élastique du ressort à l'intérieur du relais magnétique (82).
  2. RCBO tel que dans la revendication 1, dans lequel le circuit d'au moins une phase est un circuit monophasé.
  3. RCBO tel que dans la revendication 1, dans lequel le circuit d'au moins une phase est un circuit triphasé.
EP10821485.9A 2009-10-08 2010-10-08 Rcbo triphasé Active EP2486578B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2009904882A AU2009904882A0 (en) 2009-10-08 3 phase combined Earth Leakage and Miniature circuit breaker
PCT/AU2010/001323 WO2011041843A1 (fr) 2009-10-08 2010-10-08 Rcbo triphasé

Publications (3)

Publication Number Publication Date
EP2486578A1 EP2486578A1 (fr) 2012-08-15
EP2486578A4 EP2486578A4 (fr) 2014-08-06
EP2486578B1 true EP2486578B1 (fr) 2018-09-12

Family

ID=43856303

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10821485.9A Active EP2486578B1 (fr) 2009-10-08 2010-10-08 Rcbo triphasé

Country Status (3)

Country Link
EP (1) EP2486578B1 (fr)
AU (1) AU2010305324B2 (fr)
WO (1) WO2011041843A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101515321B1 (ko) * 2011-05-24 2015-04-24 미쓰비시덴키 가부시키가이샤 전자식 회로 차단기
FR3133492B3 (fr) * 2022-03-10 2024-03-01 Hager Electro Sas Système de raccordement d’un appareil électrique modulaire à un coffret de distribution électrique, appareil électrique modulaire, et ensemble comprenant un coffret de distribution électrique et un tel système de raccordement

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4636760A (en) * 1985-04-10 1987-01-13 Westinghouse Electric Corp. Low voltage circuit breaker with remote switching function
US5089796A (en) * 1990-09-19 1992-02-18 Square D Company Earth leakage trip indicator
GB9414869D0 (en) * 1994-07-23 1994-09-14 Delta Circuits Protection Module for use with a circuit breaker
FR2779568B1 (fr) * 1998-06-04 2000-07-13 Schneider Electric Ind Sa Dispositif de coupure electrique comprenant un dispositif de declenchement differentiel et disjoncteur comprenant un tel dispositif
IES20070390A2 (en) * 2007-05-30 2008-03-19 Tripco Ltd A residual current device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2486578A4 (fr) 2014-08-06
EP2486578A1 (fr) 2012-08-15
WO2011041843A1 (fr) 2011-04-14
AU2010305324A1 (en) 2012-05-24
AU2010305324B2 (en) 2015-07-16

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