WO2008098531A1 - State display device for an electric fuse cut-out - Google Patents
State display device for an electric fuse cut-out Download PDFInfo
- Publication number
- WO2008098531A1 WO2008098531A1 PCT/DE2007/000278 DE2007000278W WO2008098531A1 WO 2008098531 A1 WO2008098531 A1 WO 2008098531A1 DE 2007000278 W DE2007000278 W DE 2007000278W WO 2008098531 A1 WO2008098531 A1 WO 2008098531A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fuse
- actuator
- state
- current
- display device
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/30—Means for indicating condition of fuse structurally associated with the fuse
- H01H85/303—Movable indicating elements
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/12—Shape memory
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2300/00—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
- H01H2300/034—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H using magnetic shape memory [MSM] also an austenite-martensite transformation, but then magnetically controlled
Definitions
- the invention relates to a status indicator which indicates for an electrical fuse whether it is in a blown or not blown condition.
- An electrical fuse is an overcurrent protection device that interrupts a circuit when an inadmissibly high current flows through the fuse for an impermissibly long time. Under these conditions, the overcurrent develops enough thermal energy to melt the fuse and thus break the circuit.
- Fuses are used in a wide variety of applications such as building electrification, in the automotive sector, in the industrial sector and in many small electrical appliances.
- Each fuse comprises a fusible conductor, which is heated by the overcurrent or short-circuit current and finally melts. After the melting of the fusible conductor, the current flow does not abruptly break off as a rule due to the inductive properties of most power grids. Instead, an arc ignites, which continues the flow of electricity for a while. In this operating state, the fusible conductor is already in the gaseous state, while the current is passed over the plasma formed by the metal vapor of the fusible conductor. Usually located within the fuse a quartz sand, on which the metal vapor of the fusible conductor precipitates and thus leads to a cooling of the plasma.
- fuses include an integrated striker or indicator.
- a firing pin is biased in the non-blown state of the fuse via an internal mechanism. In this "heal" operating state of the fuse, the firing pin is barely visible from the outside. If the fuse blows, the internal mechanism releases the firing pin or indicator. The firing pin comes out, signaling a fuse blow.
- the invention has for its object to provide a reliable and cost-effective indication of the state of an electrical fuse.
- a status indicator device for an electrical fuse wherein the state indicating device comprises an actuator made of a material and coupling means that are modifiable by an electrical or magnetic excitation to couple the actuator to an electrical or magnetic state variable due to a fuse flowing through the fuse, for blowing the fuse leading fuses current induces a change in shape of the actuator, by the blown state of the fuse is still noticeable after the fading of an observer, having .
- a basic idea of the invention is to make visible a burnout of the fuse by means of a deformation of the actuator.
- the fact is exploited that an overcurrent flowing through the fuse, which reaches a level which leads to the melting of the fuse, by means of its electrical or magnetic external action, is capable of producing an actuator made of a corresponding material in its form change.
- the state variable which is coupled into the actuator with the aid of the coupling means is an electrical variable
- an electroactive actuator is expedient.
- the magnetic field can also be used as a magnetic state variable which is coupled by means of the coupling means with the actuator such that it causes the said shape change, as soon as the Fuse current exceeds a critical value, which leads to the blowing of the fuse.
- a magnetostrictive actuator which consists in particular of a magnetic shape memory actuator.
- a state-of-the-art state-of-the-art display device is much more reliable than conventional state-of-the-art displays, in which a pre-stressed firing pin or flag is released in the event of a fuse blowout in order to visualize the state of the fuse.
- Jamming of the prestressing Mechanism which leads in many cases to the failure of the known from the prior art display mechanism can be safely excluded in the condition indicator device according to the invention.
- the decoupling of the protective function of the fuse with the display function of the status indicator is also very advantageous.
- the state display device according to the invention can also be used several times if the coupling means are designed such that the state display device can be coupled again with a new fuse even after the fuse has been changed.
- the state display device according to the invention requires almost no wiring effort.
- the magnetic field is coupled into an actuator which can be changed in shape by a magnetic excitation, contactless connection of the status indicator to the fuse is possible.
- Such a condition indicator can thus be mounted without having to interrupt the fuse circuit at any position. In this way, not only the cost of the state display device itself are considerably reduced but also the cost of their installation in the electric field.
- an advantageous embodiment of the invention is characterized in that the state variable is a magnetic field caused by the fuse current and the coupling means are designed to enclose a conductor through which the fuse current flows. As the fuse current increases, so does the magnetic field caused by it.
- the magnetic field is coupled by means of the coupling means in the actuator, so that, provided that this is a form-variable by a magnetic excitation Material is deformed, so that an observer can recognize the blown state of the fuse based on the modified actuator.
- This embodiment has the particular advantage that the condition indicator device can be coupled without contact with the fuse or the circuit protected by the fuse with the aid of the coupling means.
- An alternative embodiment of the invention is characterized in that the state variable is a magnetic field caused by a parallel current, wherein the parallel current flows after the fuse has blown through in a current branch parallel to the fuse and the coupling means are designed to enclose the parallel current branch.
- the parallel current branch is in high impedance compared to the fuse as long as the fuse is not blown condition. Therefore, the previously flowing to the fuse current is only commutated to the parallel branch current when the fuse blows. This creates a magnetic field surrounding the conductor of the parallel current branch, which is caused by the parallel current. With the aid of the coupling means, this magnetic field can be coupled into the actuator and thus lead to its deformation.
- This embodiment of the invention has the advantage that a non-contact coupling of the state display device is made possible.
- the state display device can be configured such that the state variable is a parallel current which flows after the fuse has blown through in a current branch parallel to the fuse, and the coupling means are designed for the galvanic connection of the actuator to the parallel current branch.
- the parallel flow can be performed at least partially by the actuator, so that this current component flowing through the actuator leads to a change in shape of the actuator and thus to display the blown fuse.
- the galvanic coupling can also be designed in such a way that a voltage drop caused by the parallel current, for example at a shunt resistor, is tapped off above the actuator and thus contributes to its change in shape. It would be conceivable, for example, to carry out such an actuator made of a piezoelectric material.
- a comparatively simple embodiment of the invention is characterized in that the state variable is a voltage applied across the fuse and the coupling means are designed for tapping said voltage, so that the voltage drops at least partially across the actuator after the fuse has blown.
- an embodiment of the invention is particularly advantageous in which the actuator is designed such that its Form change after elimination of the stimulus caused by the state variable is maintained until the actuator is subjected to a renewed stimulation.
- Such an actuator is thus changed in its shape by the state variable such that this change in shape is not revised solely by the omission of the stimulating variable.
- An example of such materials is the so-called magnetic-shape-memory material.
- Such non-reversible holding may also be effected by additional mechanical means, e.g. a kind Einhakenmechanismus is provided which holds the changed shape actuator even after elimination of the excitation in its new form.
- the display device comprises a mechanical display element, the like with respect to the actuator is arranged that it is actuated by the change in shape of the actuator.
- the actuator could return to its original shape even after the elimination of the stimulating state variable, since the mechanical display element still maintains the state indicated by the change in shape, in particular until the manual display of the mechanical display device is reset.
- the state display device ura- summarizes a switching element which is arranged in relation to the actuator, which is actuated by the change in shape of the actuator, wherein it triggers an electric, the burning of the fuse signaling signal
- the switching element could be a relay in a circuit breaker, a circuit breaker, a fuse base, or a separate detector that detects the signal, particularly in the form of a signal light or as a message, e.g. to a higher-level programmable logic controller outputs.
- FIG. 1 shows a first embodiment of a state display device an electrical fuse
- FIG. 2 shows a second embodiment of a state display device for an electrical fuse and 3 shows a third embodiment of the state indicator device for an electrical fuse.
- FIG. 1 shows a first embodiment of a status display device for an electrical fuse 1, in which an actuator 2, which is made of a shape changeable by a magnetic excitation material is coupled by means of annular coupling means 3 with a magnetic field M 3 , which of a through the fuse 1 flowing current is caused.
- the shape of the actuator 2 thus depends on the field strength of the magnetic field M 3 . It would be conceivable, for example, an embodiment of the actuator 2 such that the magnetic field M 3 of the fuse current i s causes only a negligible change in shape in the actuator 2, as long as the fuse current i 3 corresponds to a predetermined allowable rated current.
- the magnetic field M s receives a field strength which causes a significant change in shape of the actuator 2. For example, such a change in shape could lead to an expansion of the actuator 2 which is easily recognizable by an observer.
- the state of the blown fuse would be signaled solely by the irreversible change in shape of the actuator 2.
- the actuator 2 could be actuated by the actuator 2 and an electrical relay contact, which triggers an electrical signal message.
- the burning of the fuse 1 when a corresponding triggered by the relay signal is transmitted to said remote station.
- FIG. 2 shows a second embodiment of the state display device for an electrical fuse 1.
- Parallel to the fuse 1 is a parallel current circle, which is high impedance compared to the non-blown fuse 1.
- almost no current flows through the parallel branch, as long as the fuse 1 is in a "healing" state.
- burning the fuse by 1 the Sich ceremoniessström i s commutated to the parallel branch.
- the resulting parallel current i P flows through an actuator 2 which is galvanically coupled to the parallel circuit and effects a change in shape of said actuator 2.
- the actuator 2 is manufactured from an electrostrictive material. For example, this is a polymer actuator.
- the condition indicator device in this example has coupling means 3, which are designed as a simple electrical contacting of the parallel-current branch with the actuator 2.
- the high impedance of the parallel-current branch can either be realized by the fact that the actuator 2 is made of a corresponding high-resistance electrostrictive material. Alternatively, it is also possible to provide an additional series resistor R in the parallel current branch.
- FIG. 3 shows a third embodiment of the state display device for an electrical fuse 1.
- the state variable used is an electrical voltage u s dropping across the fuse 1.
- Such a voltage u s occurs in the electrical melting 1 only to a significant degree if the fuse 1 or its fuse wire is blown. In the non-blown state, however, the fuse 1 is so low that almost no voltage drop can be observed on it.
- a significant fuse voltage drop u s initiates a blown state of the fuse 1.
- the actuator 2 is in the illustrated embodiment, with the aid of electrical contacts, which serve as coupling means 3, so coupled to the fuse 1, that the voltage drop occurring when burning through the fuse at least partially falls off at the actuator 2.
- a series resistance R can still be provided so that only a part of the potential fuse voltage u s at the actuator 2 itself drops. Due to the voltage drop across the actuator 2, the shape of the actuator 2 will change such that it is directly or indirectly perceptible by an observer.
- the actuator 2 is made of a piezoelectric material, which responds to a voltage pulse by changing the shape.
- the invention relates to a state itati- device in which the electrical and / or magnetic effects of flowing through a fuse 1 overcurrent are exploited so that they are coupled via suitable coupling means 3 in an actuator 2, which then with a perceptible by an observer Deformation responds.
- the actuator 2 is made of a material which can be changed by an electrical or magnetic variable.
- the perception of the observer can be done directly on the actuator 2 itself, in which it is designed such that the deformation caused when the fuse 1 blows through is at least partially irreversible.
- a mechanical or electrical element can be actuated by the actuator 2 or its deformation, which then causes a stable display of the blown state of the fuse 1.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DE2007/000278 WO2008098531A1 (en) | 2007-02-14 | 2007-02-14 | State display device for an electric fuse cut-out |
DE112007003456T DE112007003456A5 (en) | 2007-02-14 | 2007-02-14 | Condition indicator for an electrical fuse |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DE2007/000278 WO2008098531A1 (en) | 2007-02-14 | 2007-02-14 | State display device for an electric fuse cut-out |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008098531A1 true WO2008098531A1 (en) | 2008-08-21 |
Family
ID=38564497
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2007/000278 WO2008098531A1 (en) | 2007-02-14 | 2007-02-14 | State display device for an electric fuse cut-out |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE112007003456A5 (en) |
WO (1) | WO2008098531A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011124518A1 (en) * | 2010-04-08 | 2011-10-13 | Eto Magnetic Gmbh | Overcurrent switching device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2677100A (en) * | 1950-12-05 | 1954-04-27 | Boeing Co | Electric conductor continuity testing apparatus and method |
US4263589A (en) * | 1978-07-25 | 1981-04-21 | Jacques Lewiner | Devices for detecting the rupture of an electrical circuit element |
DE3802384A1 (en) * | 1987-08-27 | 1989-08-10 | Froelich & Kluepfel Druckluft | Apparatus for removing cores from castings |
WO2006056335A1 (en) * | 2004-11-22 | 2006-06-01 | Abb Patent Gmbh | Switching equipment comprising an electromagnetic trip device |
-
2007
- 2007-02-14 WO PCT/DE2007/000278 patent/WO2008098531A1/en active Application Filing
- 2007-02-14 DE DE112007003456T patent/DE112007003456A5/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2677100A (en) * | 1950-12-05 | 1954-04-27 | Boeing Co | Electric conductor continuity testing apparatus and method |
US4263589A (en) * | 1978-07-25 | 1981-04-21 | Jacques Lewiner | Devices for detecting the rupture of an electrical circuit element |
DE3802384A1 (en) * | 1987-08-27 | 1989-08-10 | Froelich & Kluepfel Druckluft | Apparatus for removing cores from castings |
WO2006056335A1 (en) * | 2004-11-22 | 2006-06-01 | Abb Patent Gmbh | Switching equipment comprising an electromagnetic trip device |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011124518A1 (en) * | 2010-04-08 | 2011-10-13 | Eto Magnetic Gmbh | Overcurrent switching device |
US8860534B2 (en) | 2010-04-08 | 2014-10-14 | Eto Magnetic Gmbh | Overcurrent switching device |
Also Published As
Publication number | Publication date |
---|---|
DE112007003456A5 (en) | 2010-01-21 |
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