EP1900072B1 - Pluggable surge arrester comprising one or several overvoltage elements - Google Patents

Abstract

The invention relates to a pluggable surge arrester comprising one or several overvoltage protection elements which are disposed within a structural unit comprising an optical fault indicator. The inventive surge arrester further comprises a thermal overcurrent protector (5) that encompasses an actuator for triggering a remote signalisation contact in order to indicate a fault. The structural unit comprises two chambers. The first lower chamber (1) accommodates an encapsulated spark gap or similar arrangement and the front sides of the lower chamber (1) are formed or delimited by plug-in contact surfaces (3) which are, respectively, electrically connected to the spark gap (2). A second upper chamber (4) accommodates the overcurrent protector. A partition (6) that fixes a wiring support (7) is provided between the lower and upper chambers. The plug-in contact surfaces (3) comprise a stabilisation bend (8) and extend into at least two connection lugs (9), the lower edges thereof respectively comprising a sliding or insertion ramp (10), the connection lugs (9) of the respective front sides being parallel in relation to each other.

Description

The invention relates to a plug-in Überspannungsabieiter with one or more overvoltage protection elements and a base part for mechanical or electrical recording of at least one such pluggable surge arrester according to the preamble of claim 1 and 6 respectively.

From the German utility model DE 20 2004 006 227 is a surge arrester with telecommunications contact for error signaling previously known. The triggering of the potential-free mechanism takes place in this prior art by means of thermal monitoring varistors used or the trigger unit used network spark gaps in the corresponding plug-in parts, which is forwarded via biased springs by means of slide or flexible board.

In the base part of this known overvoltage protection device, the mechanical movement is transmitted by means of a moving plunger and a rotatably mounted rocker switch on a microswitch, which provides a potential-free changeover contact at its outputs.

From the DE 100 01667 C1 a multi-pole surge arrester for use in low-voltage power supply systems is previously known, comprising a single substantially U-shaped base with terminals in the base body for the active lines and PE or ground potential, wherein in the cover of the base part guide means for releasably receiving electrically connected to the terminals contactable plug-in parts are provided with Varistor- or spark gap elements.

In the previously known multi-pole surge arresters these are used as set out in a substantially U-shaped base part, for which the surge arrester have plug contacts.

However, it has been shown that with high demands on the surge current carrying capacity, the plug contacts tend to merge. If the contact forces of the opposing contact elements on the design of the clamping seat reinforced, then for the purpose of replacement, the respective surge arrester can hardly be removed without mechanical aids, which is a significant disadvantage for the service.

From the foregoing, it is therefore an object of the invention to provide a further developed pluggable surge arrester as well as a base part for mechanical or electrical recording of such arresters, the design is particularly compact and have the necessary plug contacts between surge and the mating contacts in the base part on an excellent surge current carrying capacity up to 100 kA. The object of the invention is also to ensure this high surge current carrying capacity of the plug contacts without too high mechanical forces and / or mechanical aids occur or apply when inserting or pulling the surge arrester.

The object of the invention is achieved by the combination of features according to the teaching of claim 1 and 6, wherein the dependent claims represent at least expedient refinements and developments.

According to the invention, therefore, the pluggable surge arrester has two chambers, wherein a first, lower chamber receives an encapsulated spark gap or a similar extinguishing arrangement.

The end faces of the lower chamber are formed by plug contact surfaces or are limited by such plug contact surfaces, which are each in electrical connection to the spark gap. Preferably, a screw contact between the plug contact surfaces and the respective spark gaps is selected here.

The second, upper chamber accommodates a per se known overcurrent protection device and / or other electronic assemblies.

Between the lower and upper chamber, a partition wall is provided, which is able to fix a wiring carrier. This wiring carrier may have a trigger circuit in one application.

The plug contact surfaces, which are made of a metallic stamping material, have a stabilizing offset, which is preferably designed as a Außenkröpfung. The cranks or the plug contact surfaces themselves go into at least two spaced straight, largely smooth-surfaced terminal lugs, whose lower edges each have a sliding or insertion bevel in the sense of a chamfer. The terminal lugs of the respective end faces are parallel to each other.

The terminal lugs on the respective front side are aligned in a line.

The lower chamber is closed by a matched to the outer contour of the spark gap bottom part.

In one embodiment, the spark gap is designed as a hollow cylindrical body, wherein therefore the bottom part has a circular or circular segment shape in cross section.

In a further embodiment of the invention, at least one of the plug contact surfaces on the opposite end of the terminal lugs an integrally formed extension, which is in electrical connection to the wiring carrier. In this way, part of the wiring between spark gap and e.g. Trigger electronics can be realized.

The base part according to the invention for the mechanical or electrical recording of at least one, preferably more pluggable surge arrester has a substantially U-shape and has a switching device for potential remote Fernmekldung error conditions and contact counterparts and known terminals.

From the bottom part of this base extend substantially perpendicular extensions upwards, which receive the respective terminals in a recess provided there leading.

The terminals each have a contact counterpart, which has a U- or V-shape with an opening directed away from the bottom part.

Between the legs of the respective contact counterparts a shaped spring member is used which comprises a Führungsabwinklung corresponding to the insertion of the surge with its respective terminal lug.

Furthermore, projections or recesses are provided in the bottom part of the base part, which have a U- or V-shape, which corresponds to that of the contact counterparts, to fix them laterally.

A first leg of the contact counterpart merges into or is connected to the respective connection terminal. A second leg of the contact counterpart stands with its inside in large-area or full-surface contact with the respective likewise flat terminal lug of the surge arrester used.

The contact counterparts may also be spaced in the region of their U- or V-shape analogous to the spaced terminal lugs 9, i. be formed upstream dividing.

In the base part, a multiplicity of connection terminals with contact counterparts can be provided for modular combination arresters in order to accommodate several surge arresters in parallel next to one another.

For TT systems, an internal N / PE bridge is provided, which is located in the space between two surge arrester slots as a metal molding and non-positively connected to the respective contact counterpart, preferably by riveting.

The respective second legs of a pair of a contact counterpart can have over their width an inclined portion.

The obliquely extending portions of the second legs of the respective pair may be designed to be continuous in another embodiment.

The shape of the inclined sections is chosen to be complementary to the shape of the underside of the U-shaped base part in the region of the connecting terminals for the purpose of centering them. Furthermore, the oblique sections cause easier insertion of the surge arrester in the base provided with the contact counterparts.

The invention will be explained below with reference to a Ausführungsbeiapiels and with the aid of figures.

Hereby show:

Fig. 1 a perspective view of a plug-in Überspannunesableiters with indicated overcurrent protection device, spark gap and the structural unit of two chambers;

Fig. 2 a representation of the bottom part of the base part with terminals and internal N / PE bridge;

Fig. 3 a representation of the surge arrester with the side walls of the upper chamber and a representation of the extension for current conduction from the spark gap to electronic elements on the wiring substrate;

Fig. 4 a detailed representation of the contact counterpart in U-shape with already inserted surge, the terminal lug has reached its final position in the U-shaped portion of the contact counterpart;

Fig. 5 a perspective view of the U-shaped base member which is capable of receiving a plurality of surge arresters;

Fig. 6 a representation of the underside of the U-shaped base part, wherein the recognizable part here on the bottom part according to Fig. 2 is attached or attached, and

Fig. 7 a representation of a complete device as a combination arrester for example TT systems.

The pluggable surge arrester according to the illustrations after Fig. 1 and 3 has a first lower chamber 1, which receives an example encapsulated spark gap 2.

The end faces of the lower chamber 1 are formed by plug contact surfaces 3 or limited by such metallic plug contact surfaces 3.

The plug contact surfaces 3 are electrically and mechanically connected via a screw connection with the corresponding electrode of the spark gap 2 Connection standing.

The second, upper chamber 4 may have an overcurrent protection device 5, a defect display, not shown, or other electronic components.

Between the lower and the upper chamber is a partition 6, e.g. made of a plastic material, which accommodates a wiring carrier 7. The wiring carrier 7 is preferably designed as a printed circuit board and can mechanically wear the mentioned overcurrent protection device 5 and provide for their electrical connection.

The plug contact surfaces 3 have a stabilizing offset 8, which is directed in the example shown to the outside.

Furthermore, the plug contact surfaces 3 go over at least two spaced terminal lugs 9, whose lower edges each have a sliding or insertion bevel 10. Furthermore, the terminal lugs 9 of the respective end faces parallel to each other.

The terminal lugs of the respective end faces are aligned or in line, i. these run on a straight line.

The lower chamber 1 is closed by a matched to the outer contour of the spark gap 2 bottom part 11, preferably made of plastic material.

At the bottom part 11 projections 11.1 may be formed, which form a stop when inserting the pluggable surge arrester in the base part.

The upper chamber 4 has two of the partition 6 extending parallel upwardly extending side walls 12. As a result, the pluggable surge arrester can be completely closed with a simple cap, as shown in the illustration Fig. 7 is apparent.

At the opposite end of the terminal lugs 9 at least one of the plug contact surfaces, an integrally formed extension 13 is formed, which is in electrical connection to the wiring carrier 7. In this way, necessary potential for a trigger circuit and / or the overcurrent protection device can be introduced.

The base part for the mechanical or electrical recording of at least one, preferably a plurality of pluggable surge arrester is based on the Fig. 2 . 4 . 5 and 6 be explained in more detail.

From the bottom part 14 of the base part spaced extensions 15 extend almost vertically upwards, which guide the respective terminals 16 and record secured against displacement.

The terminals 16 each have a contact counterpart 17, which has a U-shape, with a directed away from the bottom part 14, upward free opening.

Between the legs 18 of the respective contact counterparts 17, a shaped spring part 19 is inserted, which comprises a Führungsabwinklung 20. The shaped spring part is preferably made of an element made by stamping and bending, which is held captive by its given shape between the legs 18 of the contact counterpart 17.

The Führungsabwinklung 20 points with its open end towards the respective terminal, so that there is a free space for insertion and insertion of the surge arrester with its terminal lugs 9.

In addition, 14 moldings are provided in the bottom part, which have a shape corresponding to that of the contact counterparts to fix them in addition to the extensions 15.

A first leg 18.1 of the contact counterpart 17 merges into or is connected to the respective connection terminal 16, a second leg 18.2 having its inner side in extensive contact with the respective connection lug 9 of the surge arrester used.

The contact counterparts 17 are formed in the region of their U-shape analogous to the spaced terminal lugs 9 upstream dividing (see Fig. 2 ).

In the base part as shown in FIG Fig. 2 two opposite rows of terminals or connecting elements may be provided with contact counterparts to accommodate several surge arresters in parallel side by side.

For TT systems, an internal N / PE bridge 200 is provided, which is located in the space between two surge arrester slots as a metal molded part and is non-positively connected to the respective contact counterpart 17, preferably by riveting.

The respective second legs 18.2 of a pair of contact counterparts may have an inclined portion 21 (see FIG Fig. 2 ) exhibit. These sloping sections can, as in the Fig. 2 shown to run towards each other. Due to the oblique design based on the width of the respective leg 18.2 occurs when inserting a surge arrester not the entire terminal lug 9 over its entire width in frictional contact to be overcome, but only a smaller width range.

The shape of the inclined portions 21 may be selected to be complementary to the shape 24 of the underside 23 of the U-shape base 22 in the region of the terminals for the purpose of centering them. This embodiment of the figure 24 shows the Fig. 6 , The local inclined surfaces have a shape analogous to the inclined portions 21 of the second leg 18.2, with the result of the mentioned centering when placing the part 22 on the completed with the terminals and the bridge bottom part 11th

When displaying the complete device according to Fig. 7 are a total of four surge, forming a combination arrester, taken from a base part, which has a convenient internal wiring using the aforementioned bridge. With a grooved grip surfaces 25 allow easy grasping and pulling the respective arrester, without the need for auxiliary tools must be used.

LIST OF REFERENCE NUMBERS

1

first chamber

2

radio link

3

Plug contact surface

4

second chamber

5

Overcurrent protection device

6

partition wall

7

wiring support

8th

cranking

9

terminal lug

10

chamfer

11

the bottom part

11.1

extension

12

Side wall

13

extension

14

the bottom part

15

extension

16

terminal

17

Contact counterpart

18

leg

18.1

first leg

18.2

second leg

19

Shaped spring part

20

Führungsabwinklung

200

N / PE bridge

21

sloping section

22

U-shaped base part

23

bottom

24

shape

25

grip

Claims (13)

1. A pluggable surge arrester, comprising one or more overvoltage protection elements which are mounted in a structural unit having an optical fault indicator, and comprising a thermal overcurrent protector including an actuating device for triggering a remote signalization contact so as to indicate a fault,
   characterized in that
   the structural unit comprises two chambers, wherein a first lower chamber (1) accommodates an encapsulated spark gap or similar arrangement (2) and the front sides of the lower chamber are formed or delimited by plug-in contact surfaces (3) which are, respectively, electrically connected to the spark gap (2), and wherein a second upper chamber (4) accommodates the overcurrent protector (5),
   a partition (6) that fixes a wiring support (7) is provided between the lower and upper chambers (1; 4),
   the plug-in contact surfaces (3) comprise a stabilizing bend (8) and extend into at least two connection lugs (9), the lower edges thereof respectively comprising a sliding or insertion ramp (10), the connection lugs of the respective front sides extending parallel with respect to each other.
2. The surge arrester of claim 1,
   characterized in that
   the connection lugs (9) are disposed on the respective front side in alignment with respect to each other.
3. The surge arrester of claim 1 or 2,
   characterized in that
   the lower chamber (1) can be sealed by a bottom part (11) adapted to the outer contour of the spark gap (2).
4. The surge arrester of one of the preceding claims,
   characterized in that
   the upper chamber (4) comprises two side walls (12) extending in parallel in an upward direction from the partition (6).
5. The surge arrester of one of the preceding claims,
   characterized in that
   on the end opposite to the connection lugs (9) at least one plug-in contact surface (3) comprises an integral extension which is electrically connected to the wiring support (7).
6. A base part for mechanically or electrically accommodating at least one, preferably more pluggable surge arresters according to one of the preceding claims, U-shaped and comprising a switching means for the potential-free remote signalization of fault conditions, contact counterparts and connection terminals,
   characterized in that
   spaced away extensions (15) extend from a bottom part (14), which accommodate the respective connection terminals (16) in a guiding manner, the connection terminals (16) each include a contact counterpart (17), which has a U-shape or V-shape with an opening facing away from the bottom part (14),
   a preformed spring part (19) is inserted between the legs (18) of the respective contact counterparts (17), which comprises a guide bend (20), which corresponds with the respective connection lug (9) of the surge arrester when the same is inserted.
7. The base part of claim 6,
   characterized in that
   recesses are provided in the bottom part (14), which have a U-shape or V-shape that corresponds to the one of the contact counterparts (17) so as to fix the same in position.
8. The base part of claim 6 or 7,
   characterized in that
   a first leg (18.1) of the contact counterpart extends into the respective connection terminal or is connected to the same, wherein a second leg (18.2) is with its inner side in a large-area contact with the respective connection lug (9) of the inserted surge arrester.
9. The base part of one of claims 6 to 8,
   characterized in that
   in the region of their U-shape or V-shape the contact counterparts (17) are designed in a current-dividing manner analogously to the spaced away connection lug (9).
10. The base part of one of claims 6 to 9,
    characterized in that
    it comprises a plurality of connection terminals (16) with contact counter parts (17, 18.1, 18.2) to accommodate several surge arresters in parallel side by side, with an internal N/PE bridge (200) being provided for TT-systems, which is located in the form of a metallic preformed part in the space between two surge arrester plug-in positions and is connected to the respective contact counterpart (17) in a non-positive manner, preferably by rivets.
11. The base part of claim 9,
    characterized in that
    the respective second legs (18.2) of a pair of a contact counterpart (17) have an obliquely extending section (21) over their width.
12. The base part of claim 11,
    characterized in that
    the obliquely extending sections (21) of the second legs of the respective pair extend toward each other.
13. The base part of claim 11 or 12,
    characterized in that
    the shape of the obliquely extending sections (21) is chosen to be complementary to the design of the lower side (23) of the U-shaped base part (22) within the region of the connection terminals with the purpose of centering the same.

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