WO2016034392A1

WO2016034392A1 - Switching device for overvoltage arresters

Info

Publication number: WO2016034392A1
Application number: PCT/EP2015/068781
Authority: WO
Inventors: Georg Wittmann; Edmund ZÄUNER; Christian Lang; Helmut Hirschmann
Original assignee: Dehn + Söhne Gmbh + Co. Kg
Priority date: 2014-09-05
Filing date: 2015-08-14
Publication date: 2016-03-10
Also published as: DE102015008136B4; EP3189536B1; SI3189536T1; DE102015008136A1; CN106796859A; EP3189536A1; ES2826605T3

Abstract

The invention relates to a switching device for overvoltage arresters, consisting of mechanically prestressed first switching elements which have surge current capability and form, with the arrester(s) of the overvoltage arrester, a series circuit of a surge current path, and a fault current path connected to the series circuit. According to the invention, second switching elements are arranged in the fault current path and are mechanically coupled to the first switching elements in such a manner that, in the case of lasting impermissible loads on the arresters of the overvoltage arrester in the surge current path, the first switching element(s) is/are triggered with the consequence of DC isolation of the surge current path from the respective network.

Description

Switching device for overvoltage protection devices

description

The invention relates to a switching device for overvoltage protection devices, consisting of mechanically biased, shock-current capable first

Switching elements, which form a series circuit of a surge current path with the one or more Abieitern of the overvoltage protection device, and a connected to the series circuit fault current path, according to the preamble of claim 1.

From DE 10 2009 022 069 AI a Überspannungsabieiter is previously known, in a housing mi ndestens a Ableiteiement, in particular designed as a varistor has. The previously known solution also includes a thermal shutdown device, designed as a fuse. The fuse has a movable component, which is fixed by a detector wire and released after melting or destroying this wire. The movable bolt is thus able to perform a motion with the melting of the detector wire detector. As a result of the movement of the bolt away from the fuse body up a Führungsstei l is released and it can be there existing slide perform a corresponding movement under the action of a spring biasing force. The executed movement is used for a visual damage indication.

Thermally coupled separation devices for overvoltage protection devices are also known from DE 10 2006 036 598 AI. There will be one

Tongue and an associated Lotstelle with a biasing, tripping and switching force applied. Due to the necessary thermal coupling and the time delay of the necessary heat transfer is a desired sch nelle operation i m trouble case problematic.

A combination of electrical Schaltein directions with mechanical elements to increase the self-quenching power showed the overvoltage protection arrangement according to DE 10 2011 018 556 AI. It therefore remains to be noted that overvoltage surge protection devices are usually protected by means of thermal Abtren tion of a solder joint from overloading. Such solutions have the disadvantage that the shutdown is relatively slow, ie. takes place only with the achievement of the melting temperature of the solder. A protection of the overvoltage element, in particular of the varistor used, is given only in egg nem current range of small leakage currents of a few milliamps up to a few amps. High-energy impulse current pulses or larger line frequency overload currents (TOV), however, can lead to an inadmissible failure in the sense of a

Cause explosion and destruction of the surge protective device.

Although the also known use of an integrated fuse leads to shutdown when occurring large Kurzschl ussströmen;

Fault currents below the rated fuse value can still lead to an inadmissible failure of the corresponding conductor.

Known Ma measures, such as. As the encapsulation of Va transistors with switching to a fuse or a pressure contact while improving the

Shutdown properties, but there are failures in the current range exist, which is too large for the thermal separation device, but for the shutdown of the actual device is still to geri ng.

From the foregoing, it is therefore an object of the invention to provide an advanced shutdown device for surge protective devices, which has a switching capacity in an increased current range of a few amperes to the maximum switching capacity of the switching elements in the surge current path. This is to achieve a broadband total switching capacity over the entire current range from the leakage current to the maximum switching capacity. In addition, the switching device to be developed is concerned with detecting fast tripping criteria and in this way safely disconnecting the actual overvoltage protection device from the supplying electrical network in the event of an overload.

The solution of the object of the invention is achieved by the teaching of

Feature combination according to claim 1, wherein the dependent claims len at least expedient refinements and developments. It is therefore assumed that a switching device for surge protection devices, which consists of mechanically biased, shock-current capable first switching elements. These first switching elements form with the Abieitern or, z. B. a Gasabieiter and / or a varistor of

Overvoltage protection device a series circuit within a surge current or main current path. Furthermore, a fault current path is connected to the pre-series series connection.

According to the invention, second switching elements are arranged in the fault current path, which are mechanically coupled to the first switching elements in such a way that, in the case of continuing inadmissible loads of the absorber in the surge current path, triggering of the first shadow element or elements results in a galvanic separation of the surge current path from the respective network.

The first switching elements may be formed as shock-current resistant contact arrangements, which by means of a separating slide in an open position, ie. can be converted into a separation state and can be kept in this state. Such shock current capable switching elements belong to the known prior art and are therefore known in the art with respect to structure and operation.

The second switching elements have m at least one control or actuating element a uf, which with a first lever-like coupling element in

Active compound is.

The first hebela term coupling element has a pawl to unlock a second hebela term coupling element or a corresponding coupling rod.

The second lever-like coupling element or the aforementioned coupling rod releases a lock when triggered, which otherwise mechanically

prestressed, shock current capable first switching elements in a closed state by e.g. a separating slide, which is under spring tension, is blocked.

Due to the formation of the lever-like coupling elements in conjunction with the Sperru ng can be a relatively small force of the control or actuator be translated so that sufficient actuating energy is available to the mechanically biased, shock current capable first

Switching elements directly or indirectly in the separation state, i. in the open state to convict.

The one or more second switching elements are designed in a preferred manner as a so-called indicator fuse.

This detector fuse has a bolt which is released with the melting of the detector wire, wherein the bolt bi the control or actuator bi.

The arrangement of the switching device comprising the main assemblies first switching elements, second switching elements and the mechanical coupling parts, can be arranged in a separate housing which is part of a surge protection device or for retrofitting corresponding devices use. In this respect are at the thus incurred

Only the corresponding external connections for the fault current path and the surge current path are present in the module.

Alternatively, however, the presented switching device can also be used in conventional overvoltage protection devices for the purpose of improving this in the sense of

inventive task to be integrated.

According to the invention, the surge current path represents the main circuit and the fault current path represents a self-switching type imaging circuit, and in a preferred embodiment in the imaging circuit, an impedance is connected in series with the second switching elements

Series connection a Gasabieiter, which is located in the main circuit, is connected in parallel, such that at mains frequency leakage current in the imaging circuit at Im pulse load the voltage drop across the Rei henschaltung causes ignition of Gasabieiters.

In one embodiment of the invention is in the surge current path ei ne thermally controlled separation device located. This thermally controlled

Separator can preferably the state of an im

Surge current path Varistors monitor as Abieiter. The proposed solution comprises in summary a surge current path and a parallel, not Stroßstrom-flowed fault current path. In this respect, the device forms a series circuit of two switching elements comprehensive functional units, the Funktionsei beauty in the fault current path has a way of current detection, for example on the melt integral I ² t a fuse, via ei ne solenoid or similar device, further has a Eigenabschaltvermögen and a control or actuator comprises.

The functional unit lying in the surge current path has a corresponding intrinsic switching capacity, effects a reliable disconnection function and is indirectly connected by the functional unit in the fault current path, ie. mechanically coupled.

The invention will be described below with reference to figures and a

Embodiment will be explained in more detail.

Hereby show:

Fig. 1 is a schematic diagram of the solution according to the invention;

Fig. 2 shows an exemplary embodiment of a constructive solution of

Switching device according to the invention in the untripped state and

Fig. 3 is a view similar to that of FIG. 2, but in the

triggered, ie. in Abtrennzustand the first switching elements.

The switching device for overvoltage protection devices according to FIG. 1 has the connections AI and A2, which are connected to the network to be protected. Furthermore, the device in the surge current path comprises the functional unit S2, which represents the first switching elements. Furthermore, an overvoltage protection element, i. E. a Abieiter ÜS1, preferably designed as Gasabieiter, and an overvoltage protection element ÜS2, preferably a running as a varistor, available. In the error current path is the functional unit Sl, d. H. the corresponding second switching elements, the impedance ZI and the overvoltage protection element ÜS2.

In the initial state of the mains frequency Leckstro m flows in the fault current path. If the voltage drop across the functional unit S1 and the impedance ZI causes the throttle valve ÜS1 to respond when the pulse load is applied, the current commutates into the surge current path.

The impedance ZI causes the necessary tension ungsabfali for ignition of the overvoltage protection element, d. H . the gasabieiter ÜS1.

According to the invention, the functional unit S1 is designed as a fuse with identifier. When the fuse is released, the detector releases a push-button or bolt releasing a mechanical release, which operates the functional unit S2. This is indicated by the dashed line.

The functional unit S2 then ensures the galvanic separation of the overloaded conductor from the supply network after the tripping operation. The

Functional unit S2 can additionally be combined with a thermal separation device ATV.

The execution of the aforementioned mechanical Entriegel ung can be realized according to the illustration of FIGS. 2 and 3.

As a functional unit Sl is within a part of the housing 1 mentioned

Detector fuse with actuating pin 2 located.

In the non-a dissolved state shown in FIG. 2, the switching elements S2, which are designed shock-current resistant, electrically connected, ie. the switching device is closed. The first switching elements S2 together with slide 3 are arranged in a second housing part 4.

The movement of the slider 3 is blocked by a rotatable lock 5. The block 5 is applied to egg nem second lever-like coupling element 6, which is held by a pawl 7 of a first lever-like coupling element 8. The pawl 7 opposite the end of the first lever-like

Coupling element 8, designated by the reference numeral 9, is applied to the pin 2 of the indicator.

If, as in Fig. 3, the bolt 2 is subject to a movement in Pfeilrichtu ng, the first lever-like coupling element 8 is pivoted in the arrow direction about the axis 10, so that according to the presen- tation of FIG. 3, the pawl 7 moves upwards and the second hebeiartige coupling element. 6 becomes free.

In this regard, a biasing spring 11 accelerates the pivoting of the second lever-type coupling element 6, which is executed in the direction of the arrow according to FIGS. 2 and 3 to the left, with the result of a rotational movement of the blocking element 5 in FIG

Arrow direction. As a result, in turn, the slide 3 under the force of another spring 12 i n arrow direction as shown in FIG. 2 and 3 move down, whereby the first switching elements S2 are rer in the disconnect rer.

The example in FIGS. 2 and 3, it is clear that the first switching elements S2 can be designed optimally with regard to their required surge current carrying capacity. The originating from the second switching element Sl actuating force on the bolt 2 must be sufficient ledigl I to move the first lever-like coupling element 8 together with pawl 7 from its locked position to a release position.

The inserted fuse-fuse is not main current-carrying and almost mechanical only with a circuit breaker, which is located in the main circuit, coupled and able to trigger the circuit breaker. In this respect, the fault current path is designed as a circuit that maps the current conditions in the main circuit.

Claims

claims

1. Switching device for surge protection devices consisting of

mechanically biased, shock-current capable first switching elements (S2), which form with the one or more Abieitern (ÜS1; ÜS2) of the overvoltage protection device, a series circuit of a surge current path, and one at the

Series connection connected fault current path,

characterized in that

In the fault current path, second switching elements (S1) are arranged and mechanically coupled to the first switching elements (S2) in such a way that, when the impermissible loads continue, the surge arresters (U S1, U S2) enter the surge current path

Triggering of the first switching element or elements (S2) with the consequence of a galvanic separation of the surge current path of the respective network takes place.

2. Switching device according to claim 1,

characterized in that

the second shaft elements a control or actuating element (2)

have, which with a first lever-like coupling element (8) in

Active compound is.

3. Switching device according to claim 2,

characterized in that

the first lever-like coupling element (8) has a Sperrkli levels (7) to unlock a second lever-like coupling element (6).

4. Switching device according to claim 3,

characterized in that

the second lever-like coupling element (6) releases a lock (5) when triggered, which otherwise holds the mechanically biased, shock-current capable first switching elements (S2) in a Schließzusta nd.

5. Switching device according to one of the preceding claims,

characterized in that

the second switching elements (SI) are executed as a label fuse.

6. Switching device according to claim 2 and 5,

characterized in that

the detector fuse has a bolt (2), which with the

Melting of the indicator Dra hts is released, wherein the bolt (2) forms the control or actuator.

7. Switching device according to one of the preceding claims,

characterized in that

the surge current path the main circuit and the fault current path one

Imaging circuit with Eigenabschaltvermögen represents, wherein in

Imaging circuit is the second switching elements (S l) ei ne impedance (Z I) connected in series and this series circuit is connected to a Gasabieiter (ÜS1), which is located in the main circuit, para llel, dera rt that at

mains frequency leakage current in the imaging circuit at pulse load, the voltage drop across the series circuit causes ignition of the Gasabieiters (ÜS1).

8. switching device according to one of the preceding claims,

characterized in that

In the surge current path, a thermally controlled separation device (ATV) is engaged.

9. Switching device according to claim 8,

characterized in that

the thermally controlled separation device (ATV) monitors the state of a varistor (ÜS2) located in the surge current path.