CN203747397U - Over-current protective device for protecting over-voltage protection element - Google Patents

Over-current protective device for protecting over-voltage protection element Download PDF

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Publication number
CN203747397U
CN203747397U CN201320426940.8U CN201320426940U CN203747397U CN 203747397 U CN203747397 U CN 203747397U CN 201320426940 U CN201320426940 U CN 201320426940U CN 203747397 U CN203747397 U CN 203747397U
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China
Prior art keywords
protective device
fuse element
overcurrent protective
parts
over
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Expired - Fee Related
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CN201320426940.8U
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Chinese (zh)
Inventor
R.杜尔特
J-E.施穆茨
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Phoenix Electric Manufacturing Co
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Phoenix Electric Manufacturing Co
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/021—Details concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order
    • H02H3/023—Details concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order by short-circuiting
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/043—Protection of over-voltage protection device by short-circuiting
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters

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  • Emergency Protection Circuit Devices (AREA)
  • Fuses (AREA)

Abstract

The utility model relates to an over-current protective device for protecting an over-voltage protection element (2). The over-current protective device is equipped with a fuse element (4). The fuse element (4) has an I<2>t value (A) in a correlation manner. The device is characterized in that the fuse element (4) is in parallel connection with a part (5); the part (5) has an I<2>t value (B) in a correlation manner; the I<2>t value (B) is greater than the I<2>t value (A), thereby enabling the part (5), compared with the fuse element (4), to be capable of conducting the bigger I<2>t value; the design of the fuse element (4) and the part (5) enables almost all the short and relatively-high pulse current with a high frequency part and the bigger I<2>t value to flow through the part (5); and, however, a low-frequency current, especially the current of a common low-voltage power grid just to flow through the fuse element (4).

Description

For the protection of the overcurrent protective device of over-voltage protection element
Technical field
The utility model relates to a kind of overcurrent protective device that is particularly useful for protecting over-voltage protection element, and this overcurrent protective device is with fuse element (Schmelzelement).In addition the utility model also relates to a kind of functional unit being formed by overcurrent protective device and over-voltage protection element.
Background technology
In measurement, control and regulation technology and in information technology and telecommunication technique, use overvoltage protection instrument for protection equipment, instrument and electrical appliance.In overvoltage protection instrument, especially use spark gap (Funkenstrecke), rheostat, twin zener dioder (Suppressordioden) and gas discharger (ü sAg) as over-voltage protection element at this, it has non-linear response characteristic or nonlinear characteristic line conventionally.
Overvoltage protection instrument is used for, in the time of the overvoltage of the transient state causing due to for example atmospheric discharge by limiting voltage to in equipment and the not dangerous value of instrument.This realizes conventionally thus; the pulse current producing in over-voltage events is derived (ableiten) by the overvoltage protection instrument (it is low-impedance in the time exceeding definite response voltage) being arranged in branch road arranged side by side (Querzweig), makes conventionally and instrument that overvoltage protection instrument is arranged in parallel be can't help pulse current and flow through.In over-voltage events, pass through low-impedance overvoltage protection instrument at that time for relatively short time m-common maximum number millisecond-sizable current flowing; and in specified operation (being sometimes referred to as normal operation) ideally no current flows by overvoltage protection instrument, because overvoltage protection instrument is high impedance in rated voltage.
In the time that over-voltage protection element often responds or in the time of the overload causing due to too high or lasting long overvoltage or overcurrent, can cause over-voltage protection element aging and cause thus damage or even damage over-voltage protection element gradually.Along with over-voltage protection element progressively aging this first in the state of " non-conductive " resistance of over-voltage protection element reduce, thereby specified in service until can flow through overvoltage protection instrument for the big or small leakage current of short circuit current that drives electrical network.
In order to stop this situation, overvoltage protection instrument is protected by safeties (Sicherung), and these safeties can interrupt the leakage current from definite size in failure condition.Conventionally do not use the so-called safeties F1 of main safeties for this reason, but use additional safeties F2, it is used in particular for protecting overvoltage protection instrument and is therefore together arranged in and derives in branch road with overvoltage protection instrument.
Safeties F1 and F2 use safety fuse in the prior art in support, and it must match with the derivation ability of overvoltage protection instrument.If also use safeties F2 in derivation branch road (Ableitzweig) except safeties F1, two safeties must match each other, and wherein in the situation that of 50Hz mains frequency, the relation of main safeties F1 and safeties F2 should be 1.6/1.In addition safeties F2 must unhinderedly allow large pulse current (it should be derived by overvoltage protection instrument) to pass through, thereby does not hinder the mode derived pulse electric current to expect via overvoltage protection instrument by activating safeties F2.
Each safety fuse is associated with I 2t value-its in safeties, be called fusing integration (Schmelzintegral), its show safeties its activate before can receive or guide how many energy.Therefore in the time selecting applicable safeties, it shall yet further be noted that the I of safety fuse 2t value is not less than the energy of the maximum surge current that should be derived by overvoltage protection instrument.If should can derive larger pulse current by overvoltage protection instrument, this means, corresponding for example F2 of safeties must have corresponding large I 2t value, the safety fuse so that pulse current can be flowed through.
Moreover this safeties also have relatively high load current value-also referred to as amount insured definite value (Sicherungsnennwert), it is at long duration safeties of can flowing through, and safeties do not activate.
But high load current value causes, the little fault current of the overvoltage protection instrument of can flowing through in the time that overvoltage protection instrument sustains damage does not cut off by safeties, although this wished originally.Using with lower I 2although cut off less fault current when the safety fuse of t value, but also activate safety fuse in pulse current, it should be derived by the overvoltage protection instrument in downstream originally.
Utility model content
Therefore the purpose of this utility model is; a kind of overcurrent protective device that is particularly useful for protecting over-voltage protection element is provided; relatively high pulse current can without hindrancely flow through this overcurrent protective device on the one hand; this overcurrent protective device but have as far as possible little amount insured definite value on the other hand activates it in relatively little fault current.
This object in the case of beginning described with the overcurrent protective device of fuse element thus realize, fuse element connect in parallel has parts, wherein this part relation has I 2t value (B), this I 2t value (B) is greater than the I of fuse element 2t value (A), makes and can conduct larger I via parts compared with fuse element 2t, and fuse element and parts so design, and make with HFS and high I 2t value, short and relatively high pulse current only flows through parts substantially, and the electric current that low-frequency current is especially common low voltage electric network only flows through fuse element.Preferably can conduct obviously larger I with the parts via connect in parallel compared with fuse element 2t, with compared with fuse element can conduct or derive obviously larger energy via parts.
Depend on current type electric current therefore only flow through fuse element (low-frequency current) or substantially only flow through connect in parallel parts (with HFS, large pulse current in short-term and relatively).With the parts of fusing conductor connect in parallel therefore for alleviating the burden of fuse element when the high impulse current flowing, because this high impulse electric current does not flow through fuse element and flows through parts.Because the I with part relation 2t value (B) higher than, preferably apparently higher than the I associated with fuse element 2t value (A), therefore can be by with corresponding high I in following situation lower component 2the pulse current damage of t value, in the time that this pulse current flows through parts.
By thering is relative little I according to the connect in parallel fuse element of fuse element of the present utility model and parts 2t value (A), because fuse element needn't conduct large pulse current now again.This causes, and fuse element (desired) has activated in the time having the relatively little rated current of low frequency (typical mains frequency), and relatively quickly outage electric current flows through fuse element thus.
Thus low-frequency current flow through fuse element and not (also) flow through the parts of connect in parallel, first parts are high impedances.Control assembly enters into low impedance state from high impedance status and preferably automatically realizes via voltage at this, this voltage by the fuse element of flowing through, short and relatively high, produce with the pulse current of HFS.Parts and fuse element mate so mutually at this, make to have arrived at pulse current the I that is greater than fuse element (4) 2the I of t value (A) 2before t value, parts become low-impedance.
It is important in this that, also flowing through the I of part of pulse of fusing conductor 2t value is greater than the I of fuse element 2(A) is front for t value, and parts become low-impedance.Ensure thus, before fuse element damages due to the energy of pulse current, parts become low-impedance and thus pulse current flow through parts.Response voltage or switched voltage (because its parts become low-impedance) therefore produce by the voltage drop at the fuse element place at connect in parallel.
As with the parts of fuse element connect in parallel, can preferably use gas discharger (ü sAg)., as also using voltage-controlled switch with the parts of fuse element connect in parallel, be alternatively especially the bipolar transistor with the gate electrode (IGBT) of insulation.
Can substantially use fusing conductor or common safety fuse (being sometimes referred to as fuse) as fuse element.Preferably but be arranged to, it is fuse element that coil fusing conductor uses, make by by fusing conductor design be the inductivity that coil promotes fuse element, the voltage drop that the inductivity L of coil fusing conductor answers at this promotion feeling, this voltage drop is the product (U of current time rate of change dI/dt and inductivity L ind=dI/dt*L).By selecting the corresponding high inductivity L of coil fusing conductor, large current time rate of change dI/dt is at coil fusing conductor place and also respond to high U at the parts place of connect in parallel thus ind, voltage (parts become low-impedance in the time of this voltage) reaches fast thus, low-impedance thereby parts become.
8/20 pulse current of standard reaches its maximum after about 10 μ s, produces thus sizable dI/dt.Arrive fast thus response voltage or the control voltage of the parts of connect in parallel at the induced voltage at coil fusing conductor place, parts are become than coil fusing conductor as more low-impedance.Then pulse current substantially flows through parts and no longer flows through coil fusing conductor, realizes thus alleviating of the desired burden to fuse element.Approximately after 5ms, just reaching its maximum at the lower fault current occurring of electrical network condition (50Hz) on the other hand, enough so that the parts of connect in parallel become low-impedance voltage U thereby the little current time rate of change dI/dt causing is thus not enough in the induction of fuse element place ind.Because parts are not also entered into low impedance state by control by the line voltage applying, therefore fault current flows through fuse element completely, and fuse element is heated thus.If the energy being produced by fault current exceedes the I that maximum is fuse element 2t value (A), coil fusing conductor fusing, disconnects thereby derive branch road (arranging therein the connect in parallel circuit being formed by fuse element and parts and the over-voltage protection element shielding); Fault current interruption.
By parts and fuse element connect in parallel can so be designed to fuse element, make it there is relatively little I 2t value (A) (amount insured definite value), thus in the time of relatively little fault current, cause activating fuse element.But also can flow through parallel circuits and the over-voltage protection element that connect by downstream is thus derived by the relative large pulse current of connect in parallel of parts and fuse element, fuse element does not disconnect in advance and derives branch road.As implemented before, there is large current time rate of change dI/dt with high-amplitude with the pulse current of HFS, thereby owing to reaching fast the response voltage of parts at the high voltage of fuse element place induction or controlling voltage, alleviate thus the burden of fuse element, the activation that makes to cause the remarkable heating of fuse element and can not cause thus fuse element.
The amplitude peak of pulse current is less, and dI/dt is also less for current time rate of change.The voltage declining at fuse element place below threshold value is no longer enough lighted the parts of connect in parallel or control assembly is entered into low impedance state.Therefore in the situation of fault current (it flows through parallel circuits under electrical network condition), the parts of connect in parallel do not become Low ESR, do not cause lighting gas discharger, thereby electric current (desirably) flows through coil fusing conductor completely.There is relatively little I by fuse element 2t value (A) (amount insured definite value), then such fault current passes through according to overcurrent protective device fast shut-off of the present utility model.
Also can further improve in the following manner the cut-out characteristic according to overcurrent protective device of the present utility model; use the material with high ratio resistance for fuse element; voltage drop and the energy lift changed in fuse element thus, it causes fast separately fuse element.When overcurrent protective device especially as protection component before overvoltage protection instrument with or connect to come with overvoltage protection instrument together with while using; different from traditional safety fuse; the structural scheme of fuse element high impedance is unchallenged at this, because flow through overvoltage protection instrument without rated current.
First be implemented as, as using gas discharger and use coil fusing conductor as fuse element according to preferred design with the parts of fuse element connect in parallel.The modification of this preferred design is arranged to, gas discharger is three utmost point gas dischargers, third electrode in the middle of it connects via coil, so structure and layout of its coil fusing conductor, make coil and coil fusing conductor work as instrument transformer (Transformator is sometimes referred to as transformer).The advantage that this design has is, via instrument transformer and the selection regulation voltage (should light gas discharger under this voltage) well of coil (connecting the third electrode of three utmost point gas dischargers via this coil) especially.Work as instrument transformer by coil and coil fusing conductor, because the voltage of the pulse current induction of flowing through coil fusing conductor is at a good pace enough to cause lighting gas discharger.The higher insulation voltage that such triode dlischarger has due to the interval compared with large of two main electrodes, but can in overpressure situation, utilize little response voltage to be lighted by middle third electrode.
Be arranged to according to another favourable preferred design according to overcurrent protective device of the present utility model, the connect in parallel circuit arrangement being formed by fuse element and parts is in common case, and wherein case is filled with arc-extinguishing medium.Can obviously promote thus attainable arc extinguishing ability.
According to another additional preferred design of the present utility model, heat separation device is set, itself and parts especially gas discharger heat are coupled.Preferably will be fixed on parts place with the separating mechanism of eutectic alloy (eutektischen Legierung) accordingly at this.If the temperature increase of parts exceedes threshold value, eutectic alloy fusing so, this causes mechanically interruptive current to connect with causing thus separating forcing hot parts.Use heat separation device is especially significant in following situation; when using in relatively powerful electrical network according to overcurrent protective device of the present utility model; thereby there is such danger, can not extinguish by parts separately lighting electrical network afterflow mobile after parts.
Set forth according to overcurrent protective device of the present utility model and be particularly useful for protecting over-voltage protection element in beginning.Therefore object of the present utility model is not only overcurrent protective device self, and is by the functional unit forming according to the over-voltage protection element of overcurrent protective device of the present utility model and series connection with it connection.In this over-voltage protection element, can be for example rheostat.But also can consider to use spark gap or other over-voltage protection element.
Even this advantageous applications that is overcurrent protective device, other application is also feasible.Also can be for example and motor connect in series according to overcurrent protective device of the present utility model, short and relatively high starting current can flow through motor in some cases.Such motor also can the useful fuse element of making safeties of connect in series.Avoid high starting current for the protection of fuse element with the parts of fuse element connect in parallel, it is according to substantially flowing through parts in overcurrent protective device of the present utility model and not flowing through fuse element.
Be coupled according to preferred design over-voltage protection element and heat separation device heat, can stop thus the unallowed heating that over-voltage protection element is carried out.As in fact known by prior art; heat separation device can monitor over-voltage protection element according to thermal switch principle at this; being welded to connect of making in the time that over-voltage protection element is overheated to arrange between over-voltage protection element and resolution element separates, and then this cause the TURP of over-voltage protection element disconnected.Such over-voltage protection element is for example known by file DE 20 2,004 006227 U1.
Finally also can have safety fuse by connect in series according to functional unit of the present utility model or according to overcurrent protective device of the present utility model, wherein safety fuse and overcurrent protective device preferred arrangements are in common case.This can be preferably according to applicable cases over-voltage protection element and heat separation device be together arranged in independently case in or be together arranged in common case with overcurrent protective device.
Brief description of the drawings
Specifically there is now the multiple possibility that designs and improve the functional unit forming according to overcurrent protective device of the present utility model with by overcurrent protective device and over-voltage protection element.To this, not only reference is subordinated to the claim of claim 1 and 12 but also the description that next reference combines preferred embodiment is carried out with accompanying drawing.Wherein:
Fig. 1 shows the schematic diagram of the safeties of the over-voltage protection element of realizing in the prior art,
Fig. 2 shows according to the schematic diagram of two modification of the first embodiment of overcurrent protective device of the present utility model,
Fig. 3 shows according to the schematic diagram of two modification of the second embodiment of overcurrent protective device of the present utility model,
Fig. 4 shows according to the schematic diagram of the 3rd embodiment of overcurrent protective device of the present utility model,
Fig. 5 shows according to the schematic diagram of two of another embodiment of overcurrent protective device of the present utility model modification,
Fig. 6 shows according to the schematic diagram of two modification of the 5th embodiment of overcurrent protective device of the present utility model, and
Fig. 7 shows according to the schematic diagram of two of functional unit of the present utility model modification.
Embodiment
Fig. 2 shows according to the schematic diagram of the different embodiment of overcurrent protective device 1 of the present utility model to Fig. 6; this overcurrent protective device 1 is for the protection of over-voltage protection element 2, and wherein overcurrent protective device 1 and over-voltage protection element 2 are arranged in jointly derives in branch road 3.In the time there is overvoltage accident, protect thus and the electrical appliance of deriving branch road 3 connect in parallel, over-voltage protection element 2 conducts electricity, and the pulse current producing is flowed out through derivation branch road 3 and thus without electrical appliance.
Fig. 1 has shown the over-voltage protection element 2 being arranged in derivation branch road 3, before this over-voltage protection element 2, is in series with safety fuse F2, protects thus over-voltage protection element 2 to avoid the overload that short circuit current causes.If the resistance of over-voltage protection element 2 is due to frequent response or because overload reduces; even thereby also flowing through over-voltage protection element 2 at specified electric current in service, the electric current from definite size and duration interrupts by the safeties F2 then activating so.But derive branch road 3 because pulse current to be derived in overload situations should flow through, therefore safeties F2 must also can allow such pulse current unhinderedly to pass through.Safety fuse F2 (it can transmit high impulse electric current) but conventionally also have relatively high amount insured definite value; this causes; less fault current (it flows through over-voltage protection element 2 in derivation branch road 3) does not cut off by safety fuse F2, or does not at least cut off fast enough.
According to therefore having parts 5 with fuse element 4 connect in parallel in overcurrent protective device 1 of the present utility model, it starts to become low-impedance from definite response voltage.If the voltage declining on fuse element 4 is higher than the response voltage of parts 5, low-impedance thereby parts 5 become, electric current flows through parts 5 substantially completely, alleviates thus the burden of fuse element 4.
For example can use voltage-controlled switch according to Fig. 2 a as parts 5 at this, be especially the bipolar transistor with insulated door electrode (IGBT).But preferably use gas discharger as parts 5 according to other accompanying drawing, its connect in parallel fuse element 4.Fuse element 4 can be according to Fig. 3 a by coupled in series fuse conductor 6 and coil 7 or preferably form by the coil fusing conductor 4 showing in other accompanying drawing, and it is reeled around gas discharger 5 according to Fig. 3 b.
Formed by three utmost point gas dischargers at the parts 5 according to connect in parallel coil fusing conductor 4 in the form of implementation of overcurrent protective device 1 of the present utility model shown in Fig. 4, wherein middle third electrode 8 connects via coil 9.Coil 9 and coil fusing conductor 4 act as instrument transformer at this, makes because the voltage of pulse current induction that flows through coil fusing conductor 4 is at a good pace enough for causing lighting gas discharger 5.
As especially it is evident that by Fig. 3 b, coil fusing conductor 4 and gas discharger 5 preferred arrangements are in common case 10, and this case 10 is preferably filled with arc-extinguishing medium in order to improve the arc characteristic of going out, and is especially filled with quartz sand.
Different from the embodiment district according to Fig. 3 b thus according to two of Fig. 5 embodiment, overcurrent protective device 1 is additional also has heat separation device 11, and itself and gas discharger 5 heat are coupled.If the temperature rise of gas discharger 5 exceedes threshold value, the separating mechanism of preferably realizing via eutectic alloy of heat separation device 11 causes, and the electric current that interrupts overcurrent protective device 1 connects.Difference between the embodiment shown in Fig. 5 a and Fig. 5 b is only at this, according in the form of implementation of Fig. 5 a only gas discharger 5 and coil fusing conductor 4 be arranged in common case 10, and yet heat separation device 11 being integrated in case 10 according to additional in the embodiment of Fig. 5 b.
Going back connect in series and have safety fuse 12 according to the parallel circuits being formed by gas discharger 5 and coil fusing conductor 4 in the embodiment of the overcurrent protective device 1 of Fig. 6 is additional, wherein safety fuse 12 can or be arranged in the case 10 of overcurrent protective device 1 outer (Fig. 6 a) or is equally arranged in that in the case 10 of overcurrent protective device 1, (Fig. 6 b).
Last two embodiment that show in Fig. 7 by the functional unit forming according to the over-voltage protection element 2 of overcurrent protective device 1 of the present utility model and series connection with it connection.Overcurrent protective device 1 is constructed corresponding to Fig. 5 b at this, makes this overcurrent protective device 1 also have heat separation device 11 except the parallel circuits of coil fusing conductor 4 and gas discharger 5.
In two modification of the functional unit shown in Fig. 7, as over-voltage protection element 2, rheostat is set respectively; wherein except heat separation device 11 (itself and gas discharger 5 heat are coupled), the second heat separation device 13 is set, itself and rheostat 2 heat are coupled.According to overcurrent protective device 1 and be arranged in special case 10 with the rheostat 2 of heat separation device 13 on the other hand on the one hand in the embodiment of Fig. 7 a; in 14, and being arranged in common case 15 according to whole parts of functional unit in the embodiment of Fig. 7 b.

Claims (13)

1. an overcurrent protective device, is particularly useful for protecting over-voltage protection element (2), and this overcurrent protective device is with fuse element (4), and this fuse element (4) is associated with I 2t value (A), is characterized in that, has parts (5) with described fuse element (4) connect in parallel, and wherein said parts (5) are associated with I 2t value (B), this I 2t value (B) is greater than the I of described fuse element (4) 2t value (A), makes and can conduct larger I via described parts (5) compared with described fuse element (4) 2t, and described fuse element (4) and described parts (5) so design, and make with HFS and high I 2short and the relatively high pulse current of t value only flows through described parts (5) substantially, and the electric current that low-frequency current is especially common low voltage electric network only flows through described fuse element (4).
2. overcurrent protective device according to claim 1, is characterized in that, uses voltage-controlled switch as parts (5).
3. overcurrent protective device according to claim 1, is characterized in that, uses gas discharger as parts (5).
4. according to the overcurrent protective device described in any one in claim 1-3; it is characterized in that; use with the coil of the inductivity promoting and fuse conductor as fuse element (4), this coil fusing conductor is preferably reeled around described parts (5).
5. overcurrent protective device according to claim 4, is characterized in that, described fuse element (4) has the Ohmic resistance of lifting, makes described fuse element (4) be associated with less I 2t value (A).
6. overcurrent protective device according to claim 3; it is characterized in that; use three utmost point gas dischargers as parts (5); wherein said third electrode (8) connects via coil (9), and wherein said coil (9) and described coil fusing conductor (4) works as instrument transformer.
7. according to the overcurrent protective device described in any one in claim 1-3; it is characterized in that; described fuse element (4) and described parts (5) are arranged in common case (10), and wherein said case (10) is filled with arc-extinguishing medium.
8. according to the overcurrent protective device described in any one in claim 1-3, it is characterized in that, be provided with heat separation device (11), this heat separation device and described parts (5) heat are coupled.
9. overcurrent protective device according to claim 8; it is characterized in that; described fuse element (4), described parts (5) and described heat separation device (11) are arranged in common case (10), and wherein said case (10) is filled with arc-extinguishing medium.
10. according to the overcurrent protective device described in any one in claim 1-3; it is characterized in that; described overcurrent protective device (1) connect in series has safety fuse (12), and wherein said overcurrent protective device (1) and described safety fuse (12) preferred arrangements are in common case (10).
11. overcurrent protective devices according to claim 2, is characterized in that, described voltage-controlled switch is IGBT.
12. 1 kinds by the functional unit, wherein said overcurrent protective device (1) and described over-voltage protection element (2) connect in series that especially form for rheostat according to the overcurrent protective device described in any one in claim 1 to 11 (1) and over-voltage protection element (2).
13. functional units according to claim 12; it is characterized in that; be provided with heat separation device (13); this heat separation device (13) is coupled with described over-voltage protection element (2) heat, and wherein preferably at least described over-voltage protection element (2) and described heat separation device (13) are arranged in common case (14).
CN201320426940.8U 2012-07-18 2013-07-18 Over-current protective device for protecting over-voltage protection element Expired - Fee Related CN203747397U (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202012006940.3 2012-07-18
DE201220006940 DE202012006940U1 (en) 2012-07-18 2012-07-18 Overcurrent protection device for protection of an overvoltage protection element

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CN108028527B (en) * 2015-09-01 2019-08-20 株式会社自动网络技术研究所 Protective device
CN106887822A (en) * 2015-12-16 2017-06-23 菲尼克斯电气公司 A kind of over-pressure safety device
CN106887822B (en) * 2015-12-16 2019-01-15 菲尼克斯电气公司 A kind of over-pressure safety device
CN110679053A (en) * 2017-04-11 2020-01-10 德恩塞两合公司 Separating and switching device for overvoltage protection, in particular for DC systems
US11159013B2 (en) 2017-04-11 2021-10-26 Dehn Se + Co Kg Disconnection and switch-over device for overvoltage protection, particularly for DC systems
CN108233329A (en) * 2018-03-16 2018-06-29 西安赛诺克新能源科技股份有限公司 A kind of protection circuit for improving main circuit and disconnecting response speed
CN108233329B (en) * 2018-03-16 2024-05-31 西安赛诺克新能源科技有限公司 Protection circuit for improving main circuit disconnection response speed
CN113196439A (en) * 2018-12-20 2021-07-30 西门子股份公司 Fuse cutout with integrated measuring function and cutout
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