EP1746695A1 - Overvoltage arresting device for use in industrial bus bar distribution systems - Google Patents

Abstract

The suppressor has a carrier plate (1) exhibiting a connecting flange-section. A voltage-limiting component is connected with the plate. A connection point for a fiber-optic transmission line is provided at the section. The connection point interacts with a status monitoring circuit, where the mentioned components form a module-shaped structural component, which is surrounded by an external housing adapted to respective application.

Description

The invention relates to a surge arrester arrangement for use in industrial busbar distribution systems and equipped with such systems switchgear with internal low-inductance and shock-current wiring and designed as a housing component support plate according to the preamble of claim 1.

Overvoltages, such as those that occur in switchgear, can be reduced to a compatible voltage level using standard protective components, such as follow-current extinguishing spark gaps or varistor discharge conductors. However, the design of conventional protection devices is fundamentally less suitable, since they are usually designed for a different installation environment in which cable connections represent the common connection technology.
If such devices are used in contrast changed environment of a busbar system, for example, over the impedances of leads or contact junction resistors of their unmatched connection technology additional surges can arise, which are detrimental to an otherwise achievable level of protection.

Industrial busbar distribution systems and such switchgear had a different concept to otherwise common building distribution systems. This is due to the fact that in these switchgear a first division of the main circuit of the power source takes place in individual circuits, at the end or branch points, for example, a variety of known building main distribution can be located, which the so fed energy in terms of performance-staged further circuits, i. Subdistributions, or divide to end or load circuits.

From busbar distribution systems so complex systems, such as districts or industrial plants are supplied with electrical energy. In line with the high performance that is required for distribution in this area, The current-carrying conductors are usually designed as copper bars, ie busbars. These rails have a large cross-section and are usually not isolated in order to better exploit the cross-section performance by improved cooling conditions.

For the equipment used in this area, this results in completely different connection and operating conditions compared to the widespread in the subordinate systems connection technology by means of insulated cables.

Busbar distributors have achieved ever higher performance and reliability, which is also due to the ever-increasing degree of automation of the equipment used there. The necessary electronic circuits act due to the high integration density increasingly sensitive to voltages and therefore for availability reasons must be effectively against voltages from the various sources of interference that can act on them from the environment of a switchgear and external sources, are protected.

The effects of overvoltages on the control electronics of a switchgear depend on various parameters. The most important parameters are the degree of voltage overshoot that occurs at the input of the electronic module and its duration.
An effective overvoltage protection circuit must therefore have a protection level adapted to the application and a short response time, so that even fast transient overvoltages are limited to safe levels.

The sources of interference in the environment of a switchgear are mainly transient sources of interference. The noise levels generated by them have a very different energy level, which manifests itself in the course of time as well as the magnitude of the current and voltage values and their rates of change. In addition, the noise levels can be transmitted via various media, eg as an electromagnetic wave through the air or as line-bound Electricity / voltage pulse propagate and so come in the entire system in different places to act.

Electromagnetic waves, which propagate spatially over the air, can be coupled into line systems or existing conductor loops and devices and thus act as a secondary line-bound disturbance. Rarer lightning-related overvoltages have an energy-related relatively high level of interference up to the destruction of equipment and are known to be the greatest threat to electrical or electronic equipment and their components. Particularly high overvoltages arise along or against discharges that lead directly coupled lightning currents.

In order to keep the high destruction energy resulting from such effects away from a system to be protected, lightning current surge arresters are used in distribution systems. Such arresters have in comparison to the primary disturbance very small residual levels and thereby protect the subsequent resources against destruction by flashovers and arcs. A prerequisite for achieving such a high level of protection is a suitably designed connection technology which minimizes or even ideally avoids even induction loops during the installation of the outer connection lines.

So far, the use of surge arresters arrangements in industrial busbar distribution systems with standard devices, which have the necessary conditions for an optimized use neither of the connection or the mounting technology. Specifically, the previous housing technology for equipment, such as fasteners for snap holder on a top hat rail, not designed for use in switchgear, but for the distributor installation. The conventional connection technology via screw terminals does not correspond to the connection technology via bolts and connecting lugs, as they are preferably used in switchgear connection technology. The required cable cross-sections or conductor geometries can not be connected to the terminals of equipment for installation in standard distribution systems. Conventional connection technology does not provide the necessary low-impedance in switchgear Implement connections to ensure a system-compatible protection level. Furthermore, possible short circuits in the arrester path require external short-circuit fuses, which require additional space and thus cause further costs with regard to procurement and maintenance.

Furthermore, it is very cumbersome to install in busbar systems a top hat rail for the otherwise usual, introduced in standard distributors snap fastening of the devices, since, for. the necessary mounting plate system-related is not available.

Another disadvantage is that the necessary connection technology can be detrimental to the protective effect of the surge arrester, since as a rule long distances between the connection points between which the overvoltage is to be limited must be bridged.

Further problems can occur if an externally provided arrester fuse has tripped. In this case, it is necessary to evaluate the state of the associated arrester before a new fuse link can be inserted. This requires extensive measurements on the arrester, which sometimes require special testing equipment, which leads to higher costs.

Taking into account the above facts, technical solutions have become known in which overvoltage protection devices designed for DIN rail mounting can be supplemented by means of mounting on special adapter arrangements for use on busbars.

For example, be on the DE 200 04 593 U1 directed. There is assumed by a busbar system with one or more busbars, which are connected by means of a surge arrester with a reference potential. The local system is characterized by an adapter bridge, which can be placed transversely on the busbar and which has a shock-current-resistant contact for contacting the busbar and which has at least one slot which has at least one plug contact which is electrically connected to the contact of the busbar. The surge arrester is designed as a plug-in module for the corresponding receptacle in the slot of the adapter bridge and has at least one mating contact which can be brought into engagement with the plug contact, and also has a reference potential connection which can be connected to the reference potential of the system.
The disadvantage of this solution is, inter alia, that such an adapter assembly is very expensive and alone by the use of an adapter, the advantage of extremely short connection lengths is not reached or partially nullified.

In addition, be on DE 196 26 390 C2 and the local electrical terminal with busbar connection referenced. This terminal, which is designed in particular as a terminal block, comprises an insulating housing with at least one tension spring, wherein the insulating housing has at least one conductor insertion opening for insertion of an electrical conductor to be connected and at least one actuating opening for insertion of an actuating tool for opening the tension spring. The tension spring in turn has a clamping leg with a recess for insertion of the electrical conductor to be connected, an approximately perpendicular to the clamping leg extending support leg and the clamping leg and the plant leg connecting back. The insulating housing in turn has at least one busbar receptacle. The busbar receptacle is designed in a plane with the abutment leg of the tension spring, so that the busbar in the inserted state directly on the plant leg of the tension spring under spring force of the same, whereby a direct or indirect contact with the busbar is possible by the tension spring with imported electrical conductor.

In this terminal with busbar connection is given as an additional disadvantage that must be used for mounting on an operating tool, which can lead to problems especially when working under tension.

The above-mentioned solutions to the prior art are designed for snap-in contacts or a latching connection, which in many cases do not have the desired surge current capability, which largely precludes use in industrial plants.

From the foregoing, it is therefore an object of the invention to provide a surge arrester arrangement for use in industrial busbar distribution systems and equipped with such systems switchgear, the electrical properties are adapted to the aforementioned environment and both the connection technology and the equipment of the arrester arrangement so It is extended that an application or installation is possible, without paying any attention to additional application restrictions.

According to the invention, all functions of the surge arrester, including the components arranged externally according to the prior art, are accommodated on an assembly. This module forms an electrical and mechanical unit, which is tuned to the outer configuration of the housing surrounding the module, as well as the application of the next connection technology.

According to the invention, the surge arrester arrangement is combined as a mechanically stable, self-supporting unit in a modular manner, which also ensures the necessary mechanical strength of the entire arrester. It can be designed individually adapted to the particular application, the outer housing contour and designed so that no additional support elements, such as webs or brackets, necessary, so that even at smaller quantities cost-effective production is possible.

The solution of the object of the invention with the resulting, briefly described above advantages with a combination of features according to protection claim 1, wherein the dependent claims represent at least expedient refinements and developments.

The created surge arrester arrangement is based on a carrier plate designed as a housing component. This carrier plate is made of a conductive material and has a large, integral flange portion for electrical and mechanical attachment to a busbar.

On the support plate is an insulating Innenentragteil located, which serves to record parallel-connected current fuses as a short-circuit and overload protection element.

The one or more voltage-limiting components of the arrester are each connected directly to the carrier plate with an electrical connection, wherein the one or more further electrical connections are connected via a busbar to the current fuses whose further connection leads to an external connection lug.

In the area of the carrier plate and the local connection flange section, a connection point for an optical waveguide (LWL) transmission link is provided, which cooperates with a condition monitoring circuit.

The aforementioned components form a modular assembly that is surrounded by a matched to the particular application outside housing.

Ausgestaltend is on the Innentragteil or in the vicinity of this support member, a circuit board with an ignition and display circuit available.

The light-emitting unit for the optical waveguide transmission path can be carried out in an advantageous manner as a glow lamp.

The integrated arrester fuse is designed so that it can carry a current load for which the voltage-limiting component is designed, without triggering itself, whereby the fuse interrupts in the event of sustained follow-on current or arrester short-circuit. For this purpose, the parallel fuse elements have a different tripping characteristic.

The further connection, which is led to the outer connecting lug, is fixed by a mechanically-constructively reinforced section of the outer housing and an opening there.

This further connection, which leads to the terminal lug, can be formed as a cover plate analogous to the carrier plate, so that a substantially parallel contact surface is formed on both end sides of the module.

The support plate and / or the aforementioned cover plate have a plurality of recesses for electrical and mechanical attachment to the respective busbar.

The insulating Innentragteil, which is located on the support plate, divides the space located on the support plate such that on one side of the Innentragteils or the voltage-limiting components and on the opposite side of the current fuses and in the intermediate region, the condition monitoring circuit can be arranged.

The outer housing is connected to the support plate and / or the cover plate, preferably screwed.

In an embodiment of the invention, the arrester may be formed as a spark gap, varistor or combination of these elements.

The spark gap preferably has a cylinder housing shape and is arranged standing on the carrier plate.

For optimum adaptation to a busbar distribution system, the outer terminal lug is oriented at right angles to the support plate surface in one embodiment of the invention.

The invention will be explained below with reference to an embodiment and with the aid of figures.

Fig. 1

eine typische Anschluss-Situation für Überspannungsableiter in Sammelschienen-Verteilersystemen nach dem Stand der Technik;

Fig. 2

eine perspektivische Ansicht einer Ausführungsform der Überspannungsableiter-Anordnung mit Außengehäuse;

Fig. 3

eine Darstellung analog Fig. 2, jedoch ohne Außengehäuse;

Fig. 4A/4B

verschiedene Ansichten der funktionswesentlichen Komponenten des Überspannungsableiter-Moduls ohne Trägerplatte;

Fig. 5

ein Prinzipschaltbild mit elektrischer Verschaltung der Anordnung gemäß Fig. 3 sowie 4A oder 4B und

Fig. 6

ein Verschaltungsbeispiel des erfindungsgemäßen Sammelschienen-Ableiters in 3+1-Verschaltung in einem Drehstromsystem.

Hereby show:

Fig. 1

a typical connection situation for surge arresters in busbar distribution systems according to the prior art;

Fig. 2

a perspective view of an embodiment of the surge arrester arrangement with outer housing;

Fig. 3

a representation analogous to Figure 2, but without outer casing.

Fig. 4A / 4B

different views of the functionally essential components of the surge arrester module without support plate;

Fig. 5

a block diagram with electrical interconnection of the arrangement of FIG. 3 and 4A or 4B and

Fig. 6

a wiring example of the busbar arrester according to the invention in 3 + 1 interconnection in a three-phase system.

The properties of the surge arrester arrangement according to the exemplary embodiment, which is specially designed for busbar systems, can be summarized as a modified housing technology, adapted, needs-based connection solution and integrated arrester fuse with condition monitoring.

The housing construction of the arrester according to the invention is designed so that the possibility of a large-area and thus particularly low-impedance connection technology is given.

For this purpose, the terminals are used as connection pads, which are e.g. may be formed in the form of connecting flanges and / or connecting lugs, integrated into the housing conception.

The housing encloses a self-supporting arrangement of the individual components (see FIGS. 4A and 4B), which in their entirety form the function of the arrester.

These components include surge arresters, designed as a spark gap and / or varistor and their combination or other components with similar functions; Overcurrent protection devices as short-circuit and / or overload protection and other functions, such as a Trigger circuit or monitoring devices and / or monitoring displays and a state signaling.

The required connection technology is functionally adapted to the environment of the application in order to prevent inevitable joints due to additional necessary clamp connections, additional impedances in the arrester path due to cable lengths or installation loops due to unfavorable connection configurations caused by unwanted voltage overshoots in addition to the protection level of the Arrester negatively affect downstream resources.

Fig. 1 shows a typical connection situation, as is commonly found in known busbar systems.

The arrester shown there is connected with its terminals A / B via a connecting line with the length L with a rail system in order to limit any overvoltage occurring between these connection points.

As soon as the arrester FS is ignited by the overvoltage, a surge current i _S sets in whose current change speed di / dt in the conductor loops L1 / L2 produces an induction voltage depending on their conductor geometry and the stitch length L. This induction voltage is added to the voltage Up via the terminals A / B of the arrester to a voltage U _peff , which comes at the terminals of the protected equipment G as overvoltage to the effect. As a result, the expected protection level Up of the arrester can be significantly exceeded, whereby the equipment to be protected is exposed to an increased risk of destruction.

In busbar systems, this negative effect can be reduced if the two busbars between which the arrester must limit the voltage are close to each other. However, this is usually not the case.

Otherwise, the value of the additional disturbing residual variable can essentially only be influenced via the line inductance of the connection lines of the arrester. This depends on both the cable length and the cable cross-section. As the cable length increases, the line inductance increases while the cross section remains the same and the line geometry remains constant. By contrast, cross-section (field line length) and line inductance are inversely proportional, so that with the same line length and an increased line cross-section / field line length, a lower inductance, as in the smaller line cross-section results, or a rectangular cross-section with a larger field line length has a lower inductance than an equivalent Conductor cross section with round geometry.

Thus, e.g. Based on a normalized lightning surge current 10/350 μs with the same cross section and the same cable length, but different conductor geometry deviations in the induced voltage up to twice the value. Comparatively favorable values result in rectangular conductor geometries with a high aspect ratio, e.g. 1: 100.

It is therefore desirable in terms of the effectiveness of the protective measure, the line length, i. To make the stitch length so that its line inductance is reduced to a negligible value. Since in most cases the direct connection length between the two connection points of the potentials between which the arrester must limit the overvoltage is determined by the geometry of the switchgear, in many cases the effect of the line inductance can only be influenced by the cross section or its cross sectional geometry , For this purpose, according to the invention, the arrester has a connection possibility for corresponding line cross sections or conductor geometries.

The required optimum connection possibility is achieved with the module construction according to the invention, as becomes clear in particular in FIG. 3.

Further advantages of the busbar arrester according to the invention lie in the arrangement of an integrated short-circuit protection. By this measure, the arrester is short-circuit proof in itself and it can external short-circuit protection measures omitted in the discharge path. Thus not only the line length of the connecting line can advantageously be made short, but it eliminates an external fuse unit that would otherwise be necessary.

At the same time, the short-circuit protection is designed as an overload protection adapted to the aging behavior of the arrester, by designing according to the aging behavior of the voltage limiters 17 elements used. This measure leads to a coordinated end of life of the functionally important components arrester and arrester fuse and thus the entire functional unit, which is renewed after triggering the arrester fuse. As soon as the arrester fuse has tripped, the arrester element and its shut-off element assigned to it are replaced at the same time, so that both elements always have the same aging state. In this way, the short-circuit protection also acts as overload protection by not only the one-time largest load parameters, but also a certain number of low-energy Ableitvorgänge can cause a shutdown, which always advantageously in this design, the replacement of the entire functional unit by itself.
Extensive determination of the arrester state by checking certain arrester parameters can thereby be dispensed with. The control of the arrester state is reduced to a visual check of its status display, which monitors, for example, the voltage between the arrester element and the fuse element.

Arrester and arrester fuse thus form according to the invention a coordinated arrester system, which consists on the one hand of a powerful arrester and on the other hand adapted from the performance of the arrester arrester fuse. The main feature of the vote between arrester and arrester is that the arrester fuse the surge current load, for which the arrester is designed to run without tripping.
As soon as this value is exceeded, the arrester fuse triggers. If the discharge process leads to a long-lasting line continuity or to a short circuit in the arrester, the arrester fuse interrupts the occurring short-circuit current.

In order to achieve a tuning of the two elements in the case of the arrester system according to the invention, the arrester fuse consists of two parallel current fuses with different tripping characteristics. A first of the two arrester fuses reacts to exceeding the surge current specified for the arrester. If the arrester is then damaged in such a way that it can no longer extinguish the line follow current directly following the discharge process of the surge current, the second arrester fuse of the parallel circuit is also triggered, which has a switching characteristic for relatively long-lasting current values which are smaller than the surge current. If, on the other hand, the arrester retains its extinguishing function, only partial disconnection takes place and the protective function of the arrester remains intact. The limited function now given can meet the arrester until either another surge current triggers the only long-term current fuse that is only functional or the arrester reaches its aging limit via the subsequent currents that occur as a result of further discharge processes. Alternatively, due to the coordination of the two fuses, tripping in the event of extreme overload due to shock or secondary currents will work immediately, so that there is no safety gap in such a case.

The local monitoring of the aging state of the arrester system according to the invention takes place via a condition monitoring of the arrester fuse. This local condition monitoring can be replaced or supplemented by a remote inquiry.

In the exemplary embodiment of a busbar arrester according to the invention, the remote interrogation is based on a light waveguide route, which is in each case associated with a photoreceiver, which triggers a fault message when the light signal via a floating contact disappears.

A collective fault message can be produced via this contact in terms of circuitry, which combines all the discharge paths, for example of a three-phase system, into a common message, as shown in FIG.

The use of an optical fiber transmission system has significant advantages over other systems. Thus, the problem of contact protection can be solved in connection with a voltage tap after the arrester, because at the junction for the outer connection of the system no voltage, but only light energy, which is delivered by an accommodated within the housing light emitter as an evaluable status message is applied.

The installation of an external signal circuit is thus completely unproblematic.

Finally, in an optical fiber transmission arrangement, further advantages result in the harsh environment of a busbar distribution system. Since high currents flow here via the busbar system, very high magnetic fields are generated, which are scattered into lines and cause corresponding interference voltages. These interference voltages in turn cause system disturbances, which can lead to a misinterpretation of the remote inquiry. Under certain conditions, taking into account the solution proposed here, it can be avoided that overvoltage protection devices have to be arranged in the signal line of the remote interrogation in order to prevent destruction of the interrogator by high-energy surges.

Since the arrester-side transmitting device of the monitoring device only has the task of monitoring the voltage after the separating fuse element, this can be carried out very easily and inexpensively. Here is particularly advantageous if, instead of a conventional semiconductor transmitting diode, a simple glow lamp is used as an optical waveguide light emitter.

If the busbar arrester according to the invention is connected as an N / PE arrester in a so-called 3 + 1 arrangement, it is possible to use the disconnection of the neutral conductor connected to the disconnection of the arrester fuse for monitoring. By an appropriate interconnection of the neutral conductor is interrupted to the power supply of the remote evaluation, which ultimately as well as the failure of the light signal to a response the collective fault message leads. In addition to the arrester fuses, monitoring can also record other safety-relevant functions within the arrester system. For example, it is possible to secure the circuit of a trigger circuit. If, for example, instead of the arrester fuse, this fuse would trigger, the function of the arrester system would be restricted. In the case of a detection of the state of this backup, on the other hand, an error message occurs, which would also result in this case, the replacement of the arrester.

In the embodiment of a surge arrester arrangement for use in busbar distribution systems according to Fig. 2 is initially based on a base plate or support plate 1, which simultaneously closes a housing serving, hood-like and inexpensive to create outer housing 2 on its open side.

The carrier plate 1 is designed as a connection flange for the connection of the arrester on a busbar and also serves as a mechanical attachment.

In order to produce the largest possible contact with the busbar, two mounting recesses 1 'and 1 "are provided in the connection flange of the support plate 1 in the embodiment.

On the side of the flange of the base plate is a conventional plug-in adapter 3 for the connection of the optical fiber route. Such a positioning has the advantage that the mechanically sensitive optical waveguide arrangement is protected from external mechanical influences.

Opposite the flange connection of the carrier plate 1 there is a connection lug 4, which is led out of a mechanically reinforced aperture 2 'of the front side of the housing 2 as a further connection.

This connecting plate 4 is designed so that not only round but also rectangular cross-section are easily connected.

The outer housing 2 is at its corners from below with the connection flange or the carrier plate 1 with e.g. four fastening screws 11 'to 11 "" screwed (see Fig. 3).

As can be seen from Figs. 3, 4A and 4B, the internal structure of the surge arrester assembly is designed as a self-supporting unit grouping around an inner support member 5, the electrical components being connected by bus bars 6 ', 6 ", which is not only facilitates the installation of the busbar arrester, but also allows the integration of this structure in different housing concepts in a simple manner.

According to the invention, it is possible to use this modular insert shown in FIGS. 4A and 4B in a parallelepiped or cylindrical housing whose front sides have a contact surface similar to the carrier plate 1 on both sides.
Such a housing construction may, for example, constitute an insulating support, as used in switchgear construction as an insulating spacer between two parallel busbars or as an insulating attachment of the rails to support frames. As already mentioned, the interfering line inductance in the arrester branch, as shown in FIG. 1 with a view to the prior art, is completely eliminated in such an arrangement.

Finally, such a configuration of the contact surfaces allows special connection possibilities, e.g. via ball studs or male connectors. In this way, a safe replacement of the arrester is possible even under tension.

The current fuses 7 ', 7 "connected in parallel are contacted by the busbars 6' and 6" and at the same time mechanically held, as becomes clear from the representation in particular according to FIG. 4B.

As a spark gap 8 is preferably a spark gap with a cylindrical outer housing application, which is mounted on the support plate 1 can be mounted.

The Innentragteil 5 divides the space on the support plate 1 in a left-side and right-side as shown in FIG. 3. In the left-hand area is the spark gap 8 and a circuit board 9, which has a combined ignition and display circuit. The right part of the installation space accommodates the parallel-connected current fuses 7 'and 7 "as short-circuit and overload protection elements.

The contact between the ignition and display circuit 9 and the potential of the support plate 1 is effected by a contact clip 9 ', as shown in FIG. 4A recognizable. In this illustration, it is also becoming clear how the necessary for the ignition of the spark gap and for generating the optical fiber monitoring signal or the N-conductor interruption to the evaluation device FM of FIG. 6 necessary ignition and display circuit within a quasi inner housing forming support member 5.

Fig. 5 shows the schematic diagram shown with electrical symbols and thus also the essential electrical interconnection of the arrangement of the components according to the representations of Fig. 3, and Fig. 4A and 4B of the busbar arrester according to the invention.

The assembly TRAN is located on the aforementioned circuit board and consists of a combination spark gap ignition device and optical fiber transmitter, the potential of L via the terminal A and the arrester fuse F at point P and corresponding to the potential of the busbar 6 "at the point 10 ', 10 "against the potential N / PEN at port B monitored.

Alternatively, the assembly TRAN can be replaced by an assembly TR, which has only the secure spark gap ignition device on the circuit board of FIG.

FIG. 6 shows a connection example of the busbar arrester according to the invention in a 3 + 1 arrangement in a three-phase system.
Here the line-side arresters N1, N2 and N3 are provided with a voltage-monitoring transmitting device TRAN, which generates the individual optical fiber signals LWL1, LWL2, LWL3, while the arrester between N and PE (N / PE arrester) with its short-circuit and overload protection device F interrupts the neutral conductor feed to the remote evaluation FM.
This conception of the signal evaluation of the remote interrogation causes in this case as well as in an interruption of one of the light signals LWL1 to LWL3 the line arrester a fault message on the respective contacts K1 to K3, which operate in their further expansion usually a circuit of remote monitoring of the arrester. With appropriate interconnection of the contacts K1 to K3 either a single or a collective fault message can be realized.

LIST OF REFERENCE NUMBERS

1

support plate

2

outer casing

2 '

Housing bushing

3

Optical fiber plug-in adapter

4

connection tab

5

Inner support part or inner housing

6 ', 6 "

conductor rail

7 ', 7 "

current fuse

8th

radio link

8th'

ground contact

9

Circuit board or combined ignition and display circuit

9 '

ground contact

10

Voltage monitoring point

11

Screw

Claims (13)

Surge arrester arrangement for use in industrial busbar distribution systems and switchgear equipped with such systems with internal low-inductance and shock-current-resistant wiring and a carrier plate designed as a housing component,
characterized in that
the carrier plate is made of a conductive material and has a large, integral flange portion for electrical and mechanical attachment to a busbar,
on the support plate, an insulating inner support member is located, which serves to record parallel-connected current fuses as a short-circuit and overload protection element,
the voltage-limiting component or components of the arrester are each connected directly to the carrier plate with an electrical connection, wherein the one or more further electrical connections are connected via a busbar to the current fuses whose further connection leads to an external connection tab,
a connection point for an optical waveguide transmission path is provided in the area of the carrier plate and the connecting flange section there, which cooperates with a condition monitoring circuit and wherein the aforementioned components form a modular assembly which is surrounded by an outer housing adapted to the respective application. Surge arrester arrangement according to Claim 1,
characterized in that
on the Innentragteil a circuit board is provided with an ignition and display circuit. Surge arrester arrangement according to Claim 1 or 2,
characterized in that
the light-emitting unit for the optical waveguide transmission path is designed as a glow lamp. Surge arrester arrangement according to one of the preceding claims,
characterized in that
the integrated arrester fuse the surge load, for which the voltage-limiting component is designed, can lead without triggering itself, with a sustained follow-up current or Ableiterkurzschluss interrupts the fuse and this have the parallel fuse elements have a different tripping characteristic. Surge arrester arrangement according to one of the preceding claims,
characterized in that
the further connection, which is guided to the outer connecting lug, is fixed by way of a mechanically-constructively reinforced section of the outer housing. Surge arrester arrangement according to one of Claims 1 to 4,
characterized in that
the further connection leads to a connecting lug, which is designed as a cover plate analogous to the carrier plate, so that a contact surface is formed on both end sides of the module. Surge arrester arrangement according to one of the preceding claims,
characterized in that
the support plate and / or the cover plate has a plurality of recesses for electrical and mechanical attachment to the respective busbar. Surge arrester arrangement according to one of the preceding claims,
characterized in that
the insulating Innentragteil which is located on the support plate, the space located on the support plate such that on one side of the Innentragteils or the voltage-limiting components and on the opposite side of the current fuses and in the intermediate region, the condition monitoring circuit can be arranged. Surge arrester arrangement according to one of the preceding claims,
characterized in that
the outer housing is connected to the carrier plate, preferably screwed. Surge arrester arrangement according to one of the preceding claims.
characterized in that
the arrester is designed as a spark gap, varistor or combination of these elements. Surge arrester arrangement according to Claim 10,
characterized in that
the spark gap has a cylinder housing shape and is arranged standing on the carrier plate. Surge arrester arrangement according to Claim 1,
characterized in that
the outer terminal strap is oriented at right angles to the carrier plate surface. Surge arrester arrangement according to one of the preceding claims,
characterized in that
one of the connecting flange portions is formed so that attachment of the arrester assembly can be made under tension.

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