Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H79/00—Protective switches in which excess current causes the closing of contacts, e.g. for short-circuiting the apparatus to be protected
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H37/00—Thermally-actuated switches
  • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
  • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
  • H01H37/764—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material in which contacts are held closed by a thermal pellet
  • H01H37/765—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material in which contacts are held closed by a thermal pellet using a sliding contact between a metallic cylindrical housing and a central electrode

Definitions

• Short-circuiting device in particular for arc fault protection in low and medium voltage installations
• the invention relates to a short-circuiting device, in particular for the
• Arc fault protection in low and medium voltage installations consisting of a multi-part housing, which accommodates a fixed and a movable electrode, wherein the electrodes by a sacrificial element at a distance
• a mechanical biasing element which acts on the movable electrode and a force vector in
• This short-circuiting device comprises a switching element, which from the
• Trigger signal of an error detection device is actuated. Furthermore, there are two opposing contact electrodes with means for supplying current, wherein these can be contacted to a circuit with terminals of different potential.
• the contact electrodes are under mechanical bias such that in case of short circuit spring assisted relative movement of the electrodes is executed to each other.
• a sacrificial element acts as a spacer between the contact electrodes. Moreover, there is an electrical connection between the sacrificial element and the switching element on the one hand and one of the contact electrodes on the other hand in order to bring about a thermal flow-induced thermal destruction of the sacrificial element in a targeted manner.
• DE 102005 048 003 B4 is the Victim element a thin-walled hollow cylinder with a ratio between diameter and wall thickness of the hollow cylinder> 10: 1, wherein the material of the hollow cylinder is made high-melting.
• the known short-circuiter is used in personal protection equipment which is capable of on the basis of an arc detection
• Trigger switching element Such a teaching is shown in DE 10 2013 001 612 A1, where the energy for triggering the switching element is obtained there exclusively from the energy of the fault arc occurring.
• the contact surfaces of the electrodes are compressed by the residual spring force of the biasing spring in the tripped state.
• the biasing spring force can be overcome and the movable of the electrodes are pushed back. This in turn leads to a considerable electrode erosion and the duration of the current carrying capacity is reduced.
• a short-circuiting device in particular for the arc fault protection in low and medium voltage systems, which consists of a multi-part housing, the housing accommodates both a fixed and a movable electrode, wherein the electrodes held by a sacrificial element at a distance from each other in the housing are.
• a mechanical biasing device in particular a biasing element or a biasing spring is present, which acts on the movable electrode and provides a force vector in the direction of the fixed electrode.
• Biasing element within a head portion of the housing. Furthermore, venting and pressure equalization channels and means for activating the sacrificial element are present such that the electrodes come into electrical contact with each other.
• the sacrificial element is preferably designed as a fusible element, in particular as a fusible tube, and is connected to an electrical one
• Sacrificial element is removed as a spacer.
• a first aspect of the invention is in the head of the housing a
• Locking arrangement is formed, which after activating the
• the spring-biased pin is released and prevents the movable electrode from moving back and forth so that its position relative to the fixed electrode is locked and unchangeable.
• the spring-biased pin is mounted in a complementary recess in the head of the housing, wherein the direction of movement of the bolt substantially perpendicular to the direction of movement of the movable electrode or one with the
• Electrode connected slide is.
• the aforementioned recess communicates with a viewing window in the housing to the position of the bolt and thus the state of the short-circuiting device to
• the bolt can be colored or have colored sections. At the initial position of the bolt is in
• View window for example, a green mark recognizable.
• the mark changes in the window z. B. towards the red.
• Trigger case have both with the slide in
• the sacrificial element can be designed as a melt spacer, starting from a foot part of the housing one, the Enamel Abstandsha! Ter encompassing annular wall or a corresponding annular wall is formed to prevent ingress of molten mass in the electrode gap,
• venting and pressure equalization channels to a formed in at least one housing part Abbrandauffangraum or one
• the cross-section of the venting and pressure equalizing channels increases outwardly from the interior of the device
• Venting channels with the local surface especially in the case of a metallic surface, merges.
• a wetterer part of the burn-up is transported by the air flow in the respective Abbrandauffangraum or the corresponding chamber and collected there.
• Abbrandauffanghunt executed as one or more blind holes.
• the head portion of the housing is made of a conductive material, e.g. Copper material or a copper alloy, and has an electrical terminal tab, wherein the movable electrode is arranged in the interior of the head part and laterally encompassed and guided by the head part material.
• a conductive material e.g. Copper material or a copper alloy
• a stabilizing and force-absorbing ring is clamped in such a way that undesired mechanical stresses occur
• FIG. 1 shows a longitudinal section through a short-circuiting device according to the invention with two-part housing and locking arrangement in the untripped condition.
• Fig. 2 is a view similar to that of FIG. 1, but in the
• Fig. 3 is a detailed representation of the formation of ventilation faucets together
• the short-circuiting device starts from a multi-part housing.
• a housing head part 1, e.g.
• a housing foot 2 consisting of copper, and a housing foot 2, e.g. formed of an insulating material.
• a movable electrode 3 Within the head part 1 is a movable electrode 3.
• a fixed electrode 4 is arranged in the foot part 2.
• the electrodes 3 and 4 are replaced by a sacrificial element 5, which z. B. is designed as a melting element, at a distance from each other in two-part
• a mechanical biasing element in particular a spring 6 is present, which acts on the movable electrode 3 and provides a force vector in the direction of the fixed electrode 4.
• the spring 6 is located within the head part 1 and is supported, as it were, between the head part 1 and the movable electrode 3.
• ventilation and pressure equalization channels 7 are provided and means for activating the sacrificial element 5 are formed.
• these means are a power supply 8. If the
• Sacrificial element 5 is activated by appropriate current flow, it loses its mechanical support or its rigidity, so that the movable electrode 3 moves in the direction of the fixed electrode 4 and comes into contact with the latter, so that the desired short circuit between the
• Connecting straps 9; 10 is created.
• a latching arrangement is formed, which after activating the sacrificial element 5 and contacting the electrodes 3; 4 prevents retraction of the movable electrode 3.
• a slider 11 is arranged to follow the movement of the movable electrode.
• a spring-biased pin 12 can then, when the slider in the direction as shown in FIG. 2, lowers, penetrate into the remaining space and prevent retraction of the slide 1 1 and the electrode 3 respectively.
• the spring-biased pin 12 is mounted in a respective recess in the head part 1 of the housing, wherein the direction of movement of the bolt 12 substantially perpendicular to the direction of movement of the movable
• Electrode 3 is oriented.
• Fig. 2 shows the tripped state of the short-circuiting device with the clearly visible blocking function by the above-described locking arrangement. It can also be seen that the bolt 12 with the bolt spring 13 is subjected to a force.
• the aforementioned recess communicates with a viewing window 14 in order to realize a status display 15. It is thus the position of the bolt 12 on the viewing window 14 from the outside visualized and recognizable »
• the slider 11 is, as shown in FIG. 1 and 2, received by a Isolierhulse 16 and connected to the movable electrode 3.
• the sacrificial element 5 is formed as a melt spacer, wherein, starting from the foot part 2 of the housing, a, the melt spacer encompassing wall or an annular wall 20 is formed to prevent penetration of molten material into the electrode gap.
• the ventilation and pressure equalization channels 7 located in the housing lead to a combustion chamber formed in at least one housing part or a corresponding chamber 21.
• the combustion chamber or combustion chamber 21 can preferably be embodied as a blind hole.
• the Abbrandauffangraum or the Abbrandauffanghunt 21 further has a connection 22 to the ambient atmosphere, which can be configured as an annular groove with a corresponding rotationally symmetrical design of the short-circuiting device.
• venting and pressure equalization channels 7 to the Abbrandauffangraum or to
• a stabilizing and force-absorbing ring 23 is located between the head part 1 of the housing and the housing foot part 2.
• the ring 23 is braced between the head part 1 and the housing foot part 2 in such a way that undesired mechanical forces act on the body
• Victim element 5 can be avoided.
• a displacement of the movable electrode 3 in the tripped state is blocked on one side by the locking mechanism by one backlash.
• the travel time of the spring-biased locking bolt 12 is set on the interpretation of the bolt spring 13 and the corresponding masses so that the bolt rests against the shifter 11 due to short-circuit pressure.
• the bolt 12 is moved according to the embodiment so that a visual
• the device according to the invention protrudes fall heights ⁇ lm. A compression of the sacrificial element is clearly limited even at higher heights.

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Citations (3)

• 2014
  • 2014-11-04 DE DE102014016274.5A patent/DE102014016274A1/de not_active Withdrawn
• 2015
  • 2015-09-10 WO PCT/EP2015/070713 patent/WO2016041839A1/de active Application Filing
  • 2015-09-10 EP EP15763295.1A patent/EP3195341B1/de active Active
  • 2015-09-10 DK DK15763295.1T patent/DK3195341T3/da active

Patent Citations (3)

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