EP2980822B1 - Schutzschaltgerät und magnetjoch - Google Patents

Schutzschaltgerät und magnetjoch Download PDF

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Publication number
EP2980822B1
EP2980822B1 EP15167305.0A EP15167305A EP2980822B1 EP 2980822 B1 EP2980822 B1 EP 2980822B1 EP 15167305 A EP15167305 A EP 15167305A EP 2980822 B1 EP2980822 B1 EP 2980822B1
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EP
European Patent Office
Prior art keywords
region
contact
switching device
fixed contact
area
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
EP15167305.0A
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German (de)
English (en)
French (fr)
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EP2980822A1 (de
Inventor
Thomas Rieger
Tobias Sturm
Winfried Vierling
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.)
Siemens AG
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Siemens AG
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Publication of EP2980822A1 publication Critical patent/EP2980822A1/de
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Publication of EP2980822B1 publication Critical patent/EP2980822B1/de
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying 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
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H9/36—Metal parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
    • H01H9/446—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet using magnetisable elements associated with the contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/46—Means for extinguishing or preventing arc between current-carrying parts using arcing horns

Definitions

  • the invention relates to a magnetic yoke and a protective switching device provided with the latter, in particular a circuit breaker which has an input connection and an output connection and which are designed to make contact with an electrical line.
  • the protective switching device has a switching contact which has a stationary fixed contact and a movable contact which is arranged to be movable relative thereto and which are designed such that an arc is formed between the moving contact and the fixed contact when the current-carrying switching contact is opened.
  • the protective switching device has a short-circuit release system with a coil and a release means which is mounted so as to be movable relative thereto, which is designed to act on the moving contact in the event of a release, in order to cause the switch contact to open.
  • the invention further relates to a magnetic yoke which is arranged adjacent to the coil of the short-circuit release system and which serves to increase the magnetic effect of the coil on the release means in the event of a release.
  • circuit breakers are specially designed for high currents.
  • a miniature circuit breaker (so-called circuit breaker) is an overcurrent protection device used in electrical installations and is used in particular in the area of low-voltage networks.
  • Circuit breakers and miniature circuit breakers guarantee safe disconnection in the event of a short circuit and protect consumers and electrical systems against overload, for example against damage to the cables due to excessive heating due to excessive electrical current.
  • Circuit breakers and miniature circuit breakers are used and serve in particular as switching and safety elements in electrical power supply networks monitoring and securing an electrical circuit.
  • the document DE 10 2011 089 234 discloses a magnetic yoke, but which is neither formed in one piece nor has a fixed contact area with a free end.
  • the protective switching device is connected in an electrically conductive manner to an electrical line of the circuit to be monitored via two connecting terminals in order to interrupt the electrical current in the respective line if necessary.
  • the protective switching device has a switching contact with a fixed contact and a movable contact movable relative to it.
  • the moving contact can be actuated via a switching mechanism of the protective switching device, so that the switching contact can be opened and closed. In this way, when a predefined state occurs, for example a short circuit or an electrical overload, the switch contact is opened in order to separate the monitored circuit from the electrical line network.
  • Such protective switching devices are also known in the field of low voltage technology as modular devices.
  • a so-called fixed contact piece is arranged in an electrically conductive manner on the fixed contact, which cooperates with a movable contact piece arranged on the movable contact in an electrically conductive manner. If the switch contact is opened at a point in time at which an electric current flows through the switch contact, an arc forms between the fixed contact piece and the moving contact piece moving away from it when the switch contact opens. To extinguish the arc, conventional protective switching devices have a so-called quenching chamber with a large number of quenching plates arranged next to one another and spaced apart from one another.
  • the arc If the arc is driven into the quenching chamber, it splits into several partial arcs when it strikes the quenching plates, which then burn in series between the individual quenching plates.
  • the multiple partial arcs which are electrically connected in series, lead in total to a higher arc voltage, which subsequently leads to a faster extinguishing of the arc.
  • An arc standing between the fixed contact piece and the moving contact piece leads to a so-called contact erosion, i.e. for material removal on the fixed contact piece and on the moving contact piece.
  • contact erosion leads to increased electrical resistance.
  • the contact erosion leads to contamination of the contact pieces with microparticles, which in turn leads to a higher tendency to weld between the fixed contact piece and the moving contact piece.
  • contact erosion leads to damage to the protective switching device and should therefore be avoided as much as possible. Therefore, the arc should be driven as quickly as possible from the contact area between the fixed contact piece and the moving contact piece into the quenching chamber and extinguished.
  • the electrical current still flowing during a switch-off process by the protective switching device even after the arc commutates to another current-carrying element, leads to the contact area being heated further. This promotes the re-ignition of the arc in the contact area, which can lead to the burning of individual components arranged in this area and must therefore be avoided at all costs.
  • the protective switching device which is designed in particular as a line circuit breaker, has an input connection and an output connection which are designed to contact the protective switching device with an electrical line. Furthermore, the protective switching device has a switching contact, which in turn has a stationary fixed contact and a movable contact movable relative to it, which are designed such that an arc is formed between the moving contact and the fixed contact when the current-carrying switch contact is opened. Furthermore, the protective switching device has a short-circuit triggering system, which in turn has a coil and a triggering means that is movably mounted relative to it and is designed to act on the moving contact in the event of a triggering, in order to cause the switching contact to open.
  • the short-circuit release system has a magnetic yoke which is formed in one piece and has a coupling area. Furthermore, the fixed contact is formed by a fixed contact area of the magnetic yoke, which is integrally connected to the coupling area at its first end, and the second end of which is designed as a free end. Furthermore, the magnetic yoke has an arcing chamber area which is connected in one piece to the coupling area and forms a bypass current path which occurs when an arc occurs as a result of an opening of the switching contact after commutation of the arc is energized from the fixed contact area to the arcing chamber area.
  • the protective switching device has a switching contact, consisting of a fixed contact and a movable contact movable relative thereto.
  • a separate fixed contact piece can be attached in an electrically conductive manner to the fixed contact, which cooperates with a movable contact piece arranged on the movable contact in an electrically conductive manner.
  • the moving contact can be actuated via a switching mechanism of the protective switching device, the fixed contact is formed as a partial area of the magnetic yoke of the short-circuit release system of the protective switching device, the so-called fixed contact area of the magnetic yoke.
  • the resulting combination of functions on already existing components of the protective switching device leads to a reduction in the number of parts and thus to a reduction in the assembly effort and the manufacturing costs of the protective switching device.
  • the action of the release means on the moving contact can take place directly, but also indirectly - for example, by an action of the release means on the switching mechanism, which in turn then actuates the moving contact and thus opens the switching contact. Both options, both indirect and direct action on the moving contact, can also be combined.
  • the design of the second end of the fixed contact area as a free end means that the fixed contact is arranged in a stationary manner, but no longer rigidly in the housing of the protective switching device. This has the advantage that when the switching contact is suddenly closed by means of a snap action, the free end can spring somewhat, which significantly dampens the bouncing back of the moving contact. The damage to the contact pieces by small micro-arcs, as occurs when using a rigid fixed contact, is significantly reduced.
  • the design of the second end of the fixed contact area leads as Free end so that in the event of a short circuit the direct current flow is interrupted after the arc commutates to the quenching chamber area.
  • the load duration acting on the fixed contact area due to the high short-circuit current can thereby be significantly reduced, so that damage due to high temperatures due to the short-circuit current is avoided.
  • the magnetic yoke is formed in one piece and can therefore be produced relatively inexpensively in comparison to multi-part designs.
  • the coupling area serves, for example, to couple the magnetic yoke to the coil of the short-circuit release system.
  • This coupling can be both electrical and magnetic in nature.
  • a mechanical coupling to a housing of the protective switching device can be implemented with the aid of the coupling area.
  • the coupling area has an opening for carrying out the triggering means. Since the magnetic yoke - and here in particular the coupling area - is arranged at least in sections between the short-circuit release system and the moving contact, the opening formed in the coupling area of the magnetic yoke represents a simple, space-saving and inexpensive means of acting on the moving contact with the aid of the release means To effect opening of the switching contact.
  • the coupling area is shaped in such a way that a magnetic core is formed, which is at least partially received in the coil in the assembled state.
  • the magnetic core serves to significantly increase the magnetic effect of the trip coil. This effect can be improved, ie increased, if the magnetic core is at least partially immersed in the coil.
  • the coupling area serves for the magnetic coupling of the magnetic yoke to the coil of the short-circuit release system.
  • the coupling area is designed for fastening a magnetic core, which is at least partially received in the coil in the assembled state.
  • the magnetic core can also be mounted as a separate component on the coupling area of the magnetic yoke.
  • this has the advantage that the magnetic core can be made more solid, which increases its magnetic effect.
  • a suitable material can be selected for this without having to take into account the design of the magnetic yoke. This leads to significantly higher degrees of freedom with regard to the design of the protective switching device, which is particularly advantageous in the case of high-end devices.
  • the magnetic core can be connected to the coupling area by means of welding or riveting.
  • Welding or riveting are simple and cost-effective methods for establishing a connection between the magnetic core and the coupling area of the magnetic yoke.
  • the free second end of the fixed contact area is designed as a contact horn.
  • the contact horn which is oriented towards the quenching chamber area at the free end, the arc which arises when the energized switching contact is opened is drawn away from the switching contact in the direction of the quenching chamber or the prechamber area arranged in front of the quenching chamber.
  • the arc On its way towards the free second end, the arc commutates from the fixed contact area to the quenching chamber area of the magnetic yoke. From this point in time, the electrical current no longer flows via the fixed contact area, but via the bypass current path that is now energized. In this way, re-ignition of the arc in the contact area and excessive heating - and thus possible damage to the fixed contact area - are effectively avoided.
  • an electrical connection area is formed by a connection area of the coupling area to the arcing chamber area for contacting the coil.
  • an electrical connection area for contacting the coil is formed on the coupling area, which is arranged opposite a connection area of the coupling area with the arcing chamber area.
  • connection area of the coil at a connection area of the coupling area with the arcing chamber area, or opposite this connection area represent possible alternatives for the electrical contacting of the coil with the magnetic yoke.
  • the advantage of the respective alternative is the arrangement of the other components of the protective switching device , especially in confined spaces, and depending on the requirements for the ergonomic mounting of the protective switching device.
  • the magnetic yoke can be produced as a bent sheet metal part.
  • the design as a bent sheet metal part is an extremely inexpensive way of producing the magnetic yoke.
  • the magnetic yoke according to the invention for a short-circuit release system of a protective switching device, in particular a miniature circuit breaker, is formed in one piece and has a coupling area. Furthermore, the magnetic yoke has a fixed contact area which forms a stationary part of a switching contact of the protective switching device, is integrally connected to the coupling area at its first end, and the second end of which is designed as a free end. Furthermore, the magnetic yoke has a quenching chamber area which is integrally connected to the coupling area and forms a bypass current path which is energized when an arc occurs as a result of an opening of the switching contact after the arc has been commutated from the fixed contact area to the quenching chamber area.
  • the magnetic yoke is relatively inexpensive to produce due to its one-piece design compared to multi-part embodiments. Furthermore, several components - originally designed as individual parts - are integrated in the magnetic yoke according to the invention: by merging the original magnetic yoke with the original fixed contact area to form a single component, the number of parts is significantly reduced, which has an advantageous effect on the manufacturing and assembly costs of the protective switching device.
  • the design of the second end of the fixed contact area as a free end enables the fixed contact to be arranged in a stationary manner, but no longer rigidly in the housing of the protective switching device.
  • This has the advantage that when the switching contact closes suddenly, for example with the aid of a snap action, the free end can spring somewhat, which significantly dampens the bouncing back of the moving contact. This significantly reduces the damage to the contact elements caused by small micro-arcs, as occurs when using a rigid fixed contact.
  • the design of the second end of the fixed contact area as a free end means that, in the event of a short circuit, the direct flow of current through the fixed contact area is interrupted after the arc has been commutated to the arcing chamber area.
  • the energy input acting on the fixed contact area due to the high short-circuit current can thereby be significantly reduced, since the fixed contact area is not permanent, i.e. until the arc is finally extinguished in the quenching chamber, but only until the arc commutates from the fixed contact area to the quenching chamber area. In this way, damage to the fixed contact area by the high temperature development associated with the short-circuit current is effectively avoided.
  • the coupling area serves, for example, to couple the magnetic yoke to the coil of the short-circuit release system.
  • This coupling can be both electrical and magnetic in nature.
  • a mechanical coupling to a housing of the protective switching device can be implemented with the aid of the coupling area.
  • the coupling area has an opening for the implementation of the triggering means. Since the magnetic yoke - and here in particular the coupling area - is arranged at least in sections between the short-circuit release system and the moving contact, the opening formed in the coupling area of the magnetic yoke represents a simple, space-saving and inexpensive means of acting on the moving contact with the aid of the release means To effect opening of the switching contact.
  • the coupling area is shaped in such a way that a magnetic core is formed, which is at least partially received in the coil in the assembled state.
  • the magnetic core serves to significantly increase the magnetic effect of the trip coil.
  • the coupling area serves for the magnetic coupling of the magnetic yoke to the coil of the short-circuit release system.
  • the free second end of the fixed contact area is designed as a contact horn.
  • the contact horn which is oriented towards the extinguishing chamber area at the free end, the arc which arises when the current-carrying switching contact is opened is drawn away from the switching contact in the direction of an extinguishing chamber of the protective switching device or an antechamber area arranged in front of the extinguishing chamber.
  • the arc On its way towards the free second end of the fixed contact area, the arc commutates from the fixed contact area to the quenching chamber area of the magnetic yoke.
  • an electrical connection area is formed by a connection area of the coupling area with the arcing chamber area for contacting the coil.
  • an electrical connection area is provided on the coupling area Contacting of the coil is formed, which is arranged opposite a connection area of the coupling area with the arcing chamber area.
  • connection area for contacting the coil at a connection area of the coupling area with the arcing chamber area, or opposite this connection area, represent possible alternatives for the electrical contacting of the coil with the magnetic yoke.
  • the advantage of the respective alternative is the arrangement of the other components of the protective switching device, in particular where space is limited, and depending on the requirements for the ergonomic mounting of the protective switching device.
  • the magnetic yoke can be produced as a bent sheet metal part.
  • the design as a bent sheet metal part is an extremely inexpensive way of producing the magnetic yoke.
  • FIGs 1A and 1B shows the schematic structure of a protective switching device 1, as is known from the prior art.
  • a side view of the protective switching device 1 is shown schematically;
  • Figure 1B shows the corresponding equivalent circuit diagram.
  • the protective switching device 1 has an input connection 3-1 and an output connection 3-2, which are received and held in a housing 2 of the protective switching device 1.
  • the input connection 3-1 and the output connection 3-2 are designed for contacting the protective switching device 1 with an electrical line (not shown) and each have a clamping screw 3-3 for clamping the electrical conductors.
  • the input connection 3-1 is electrically conductively connected via an electrical coil 8 to a fixed contact 4 arranged in a fixed manner in the housing 2.
  • the fixed contact 4 forms, together with a movable contact 5 movably mounted relative thereto, a switching contact which can be opened and closed in order to interrupt or enable the current flow between the input connection 3-1 and the output connection 3-2.
  • the moving contact 5 is attached to a rotatably mounted moving contact carrier 6.
  • the moving contact carrier 6 is in turn electrically conductively connected to the output connection 3-2 via a strand 14.
  • a short-circuit release system of the protective switching device 1 serves to open the switching contact.
  • the moving contact 5 is moved away from the fixed contact 4 with the help of the moving contact carrier 6.
  • the short-circuit release system has a coil 8 with a release means 9 slidably mounted therein, which in the present case is designed as an armature-tappet unit.
  • the triggering means 9 has an armature and an armature thereon molded extension - which can be designed, for example, as a plunger - on. If the armature is drawn into the coil 8 at one end of the coil, the extension formed opposite the armature is pressed out of the coil 8 at the other end of the coil. This movement is used to open the switching contact when a short circuit occurs.
  • the protective switching device 1 additionally has a switching mechanism (not shown) which, when the plunger 9 acts on the switching mechanism, causes the switching contact to open suddenly via a mechanical chain of action.
  • a switching mechanism (not shown) which, when the plunger 9 acts on the switching mechanism, causes the switching contact to open suddenly via a mechanical chain of action.
  • an actuating element 2 is arranged on its front side, which is in operative connection with the moving contact carrier 6, for example via the switching mechanism. In this way, the switching contact can be opened and closed manually using the actuating element 2.
  • This action of the triggering means 9 on the moving contact carrier 6 via the switching mechanism of the protective switching device 1 is referred to as indirect or indirect action.
  • an arc 7 arises, which initially burns between the fixed contact 4 and the moving contact 5. If the moving contact 5 moves away from the fixed contact 4, the increasing arc voltage with increasing length of the arc 7 leads to the fact that the arc 7 commutates on a guide rail 11, which is arranged below the opening switching contact.
  • the first end of the guide rail 11 is electrically conductively connected to a lower end of an arc quenching chamber 10, the second end of the guide rail 11 to the output connection 3-2.
  • An upper end of the arc quenching chamber 10 is electrically conductively connected to the fixed contact 4.
  • the electro-magnetic forces occurring due to the short-circuit current interact with the arc 7 in such a way that it is moved away from the opening switching contact.
  • This force on the arc 7 initially acts in the direction of the so-called prechamber area 13, which is located below the switching contact in front of the arc quenching chamber 10.
  • the arc 7 is then pushed into the arc quenching chamber 10.
  • the arc quenching chamber 10 has a large number of quenching plates. If the arc 7 strikes the quenching plates, it breaks down into a corresponding number of partial arcs electrically connected in series. Due to the resulting higher arc voltage, the arc finally breaks off and goes out.
  • FIG. 2A to 2E Various exemplary embodiments of the magnetic yoke 15 according to the invention are shown schematically.
  • a magnetic yoke is generally used to concentrate the magnetic field generated by the coil 8 in such a way that the force acting on the armature-tappet unit is increased.
  • the in the Figures 2A to 2E The illustrated embodiments of the magnetic yoke 15 all have a coupling area 20, a fixed contact area 30 and an arcing chamber area 40.
  • the coupling area 20 serves for the mechanical coupling of the magnetic yoke 15 to a housing of the protective switching device 1.
  • the coupling area 20 also serves for the electrical and / or magnetic coupling of the magnetic yoke 15 with the coil 8 of the short-circuit release system of the protective switching device 1.
  • the coupling area 20 can be a Have opening 21, through which the plunger 9 (see Fig. 1 ) is passed through to act on the moving contact 5 or on the moving contact carrier 6.
  • a connection area 24 formed on the coupling area 20 serves for the electrical contacting of the coil 8, for example by means of welding or brazing.
  • the fixed contact area 30 is integrally connected at its first end 31 to the coupling area 20 and forms the fixed contact 4 (see Fig. 1 ) of the protective switching device 1.
  • a contact element 34 is fastened to the fixed contact area 30, which is connected to another, on the moving contact 5 (see Fig. 1 ) trained contact element cooperates and forms the switching contact of the protective switching device 1.
  • the use of separate contact elements allows - with regard to the materials used - a more flexible design of the individual components, in which the components can be adapted to the respective function of the component with regard to their material properties.
  • the second end 32 of the fixed contact area 30 is designed as a free end. This has the advantage that the fixed contact area 30 is less rigid and can spring to a limited extent.
  • the switching contact suddenly closes, as occurs, for example, when using a snap-action switching mechanism, the movement of the moving contact 5 is prevented or at least reduced.
  • the free second end 32 is designed as a contact horn 33. In this way, the high electromagnetic forces that occur in the event of a short circuit can be used in a targeted manner to influence the arc 7 in order to drive it as quickly as possible out of the area of the switching contact in the direction of the prechamber area 13 and further in the direction of the arcing chamber 10.
  • the quenching chamber region 40 is also connected in one piece to the coupling region 20 via a connecting region 41 and forms the upper end of the arc quenching chamber 10 (see Fig. 1 ) of the protective switching device 1.
  • the arcing chamber area 40 serves as a bypass current path 42 (see FIG. 6), which is energized from the fixed contact area 30 to the arcing chamber area 40 only after a short circuit occurs when the arc 7 is commutated. This effect is achieved in that the second end 32 of the fixed contact area 30 is designed as a free end. This has the imperative that the free second end 32 is not directly electrically connected to the arcing chamber region 40.
  • the fixed contact area 30 is only thermally stressed during the period from the formation of the arc 7 to its commutation on the quenching chamber area 40, but not during the period from the commutation until the arc 7 in the arc quenching chamber 10 is finally extinguished.
  • the electrical (short-circuit) current flows from the input connection 3-1 via the coil 8 and the quenching chamber area 40 and the arc 7 to the output terminal 3-2.
  • the fixed contact area 30 is no longer energized.
  • Figure 2A shows in a first embodiment a basic form of the magnetic yoke 15, in which the coupling area 20 is designed only for assembly with the coil 8.
  • Figure 2B The second exemplary embodiment shown shows a magnetic yoke 15 with a coupling region 20 to which an additional magnetic core 23 is attached.
  • this magnetic core 23 With the help of this magnetic core 23, the magnetic field generated by the energized coil 8 is bundled, as a result of which the magnetic force acting on the armature-tappet unit of the short-circuit release system is amplified.
  • Figure 2C such as Figure 2D
  • Embodiments shown show a magnetic yoke 15 with a magnetic core 24 for amplifying the magnetic force acting on the armature-tappet unit.
  • the magnetic core 24 is not attached to the coupling area 20 as an independent component, but is connected in one piece to the actual coupling area 20.
  • This one-piece design of the magnetic yoke 15 as a bent sheet metal part allows the assembly effort and significantly reduce the manufacturing costs of the magnetic yoke 15.
  • FIG. 2E The exemplary embodiment shown shows a magnetic yoke 15, the coupling region 20 of which is of reduced design and has no opening 21 for the passage of the plunger 9. Rather, this area, ie the area of the opening 21, is completely omitted, so that the plunger 9 is guided past the magnetic yoke 15 above the coupling area 20.
  • This embodiment is of particular interest for short-circuit release systems which operate without an additional magnetic core, since this considerably simplifies the assembly of the magnetic yoke 15.
  • connection area 24 for electrical contact with the coil 8 is formed opposite the connection area 41 on the coupling area 20, while the connection area 24 in the in the Figures 2A to 2C
  • the exemplary embodiments shown are formed by the connecting region 41 of the coupling region 20 with the arcing chamber region 40.
  • FIG. 3 shows a schematic representation of an equivalent circuit diagram of the protective switching device 1 according to the invention when using the magnetic yoke 15 according to the invention.
  • the electrical current coming from the input terminal 3-1 flows via the coil 8 of the short-circuit release and the closed switching contact to the output connection 3-2 (upper current path) .
  • the switching contact is opened, ie the moving contact 5 is moved away from the fixed contact 4 via the moving contact carrier 6 which is rotatably mounted at point D.
  • An arc 7 is formed which initially burns between the fixed contact 4 and the moving contact 5. As the process continues, the arc is moved out of the switch contact area in the direction of the quenching chamber 10 driven.
  • the arc commutates from the fixed contact area 30 to the quenching chamber area 40 of the magnetic yoke 15.
  • This quenching chamber area 40 now acts as a bypass current path 42, ie during the period from the commutation of the arc 7 until its extinction, the electrical (short-circuit) current flows from the input connection 3 -1 via the coil 8 and the quenching chamber region 40 (lower current path) acting as a bypass current path 42, and further via the arc 7 in or in front of the arc quenching chamber 10 to the output terminal 3-2.
  • the fixed contact area 30 of the magnetic yoke 15 is no longer energized from the point in time at which the arc 7 commutates to the arcing chamber area 40.
  • the thermal load on the fixed contact area 30 can thereby be significantly reduced.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Electromagnets (AREA)
  • Breakers (AREA)
EP15167305.0A 2014-07-30 2015-05-12 Schutzschaltgerät und magnetjoch Active EP2980822B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014215007.8A DE102014215007A1 (de) 2014-07-30 2014-07-30 Schutzschaltgerät und Magnetjoch

Publications (2)

Publication Number Publication Date
EP2980822A1 EP2980822A1 (de) 2016-02-03
EP2980822B1 true EP2980822B1 (de) 2020-03-04

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EP (1) EP2980822B1 (zh)
CN (1) CN105321749B (zh)
DE (1) DE102014215007A1 (zh)

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DE102017212033A1 (de) 2017-07-13 2019-01-17 Siemens Aktiengesellschaft Gleichstrom-Lichtbogenlöschvorrichtung und elektromechanisches Gleichstrom-Schaltgerät
DE102017214557B4 (de) 2017-08-21 2024-08-08 Siemens Aktiengesellschaft Elektromechanisches Schutzschaltgerät
CN107958829B (zh) * 2017-12-08 2021-09-07 厦门宏发开关设备有限公司 一种n极静触头及其带n极的断路器
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DE102014215007A1 (de) 2016-02-04

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