RU2398327C1 - Insert discharger comprising one or several elements of overvoltage protection - Google Patents

Abstract

FIELD: electricity. ^ SUBSTANCE: insert discharger comprises one or several overvoltage protection elements. Besides elements of overvoltage protection are located in structural unit with optical indication of fault, and also including heat current safety fuse (5), which comprises actuator device for actuation of remote signalling contact that serves to signalise faults. Structural unit comprises two chambers, besides the first one, lower chamber (1) includes capsulated spark gap or similar structure, and ends of lower chamber (1) are produced or limited by plug-in contact surfaces (3), which are electrically connected to spark gap (2). The second upper chamber (4) includes current safety fuse. Besides between lower and upper chamber there is a separation wall (6), which fixes wiring plate (7). Plug-in contact surfaces (3) comprises stabilising bend (8) and change into at least two terminals (9), lower edges of which include inlet slope (10), besides, terminals (9) of according ends pass parallel to each other. ^ EFFECT: increased compactness of design and increased stability of plug-in contacts to impact currents, reduced mechanical forces in process of installation and withdrawal of dischargers. ^ 12 cl, 7 dwg

Description

Technical field

The invention relates to a surge arrester with one or more surge protection elements, as well as to a support unit for mechanically or electrically connecting at least one such plug-in arrester according to the preamble of claim 1 or 6.

State of the art

From the German utility model DE 202004006 227 there is known a spark gap with a telealarm contact for signaling faults. The triggering of potential-free mechanics takes place in this prior art by means of thermal monitoring of the installed varistors or of the trigger circuit of the used spark gaps in the respective connected units, and this actuation is transmitted further through the pre-tensioned springs by means of a gate or a flexible plate.

Based on this known surge protection device, mechanical movement is transmitted by means of a moving pusher and a rocker arm, which is rotatably supported, to a micro switch, which at its outputs provides a potential-free switching contact.

From DE 10001667 C1, a multi-pole arrester is known for use in low-voltage power supply systems, containing a single, essentially U-shaped support and connection unit with connection terminals in the housing for active wires and ground potential, with guide means for disconnecting being provided in the housing of the assembly connection of plug-in assemblies contacting with connecting terminals with varistor elements or spark gap elements.

In known multi-pole arresters, they were said to be inserted into the support-connecting unit, which has a substantially U-shape, for which the arresters have plug contacts.

However, it was shown that with high requirements for resistance to shock currents, plug contacts are prone to reflow. Since the contact forces of opposing contact elements are increased by making terminal sockets, the corresponding arrester can hardly be removed for the purpose of replacement without mechanical aids, which is a significant disadvantage in servicing.

Disclosure of invention

It follows from the foregoing that the object of the invention is to create an improved plug-in arrester, as well as a support assembly for mechanically or electrically connecting such arresters, the design must be particularly compact, and the necessary plug contacts between the arrester and the contact contacts in the support assembly must have high resistance to shock currents up to 100 kA. The objective of the invention is also to guarantee this high resistance of the plug contacts to shock currents, and while installing or removing the arresters there should not be too high mechanical forces and / or mechanical aids should be applied.

The objective of the invention is solved due to the combination of features according to claim 1 or 6 of the claims, and the dependent claims are at least suitable options for implementation and development.

According to the invention, the plug-in arrester has, respectively, two chambers, the first, lower, chamber receiving an encapsulated spark gap or a similar arcing structure.

The ends of the lower chamber are formed by plug-in contact surfaces or are limited to similar plug-in contact surfaces that are electrically connected to the spark gap. Preferably, a screw contact between the plug contact surfaces and the corresponding spark gaps is selected here.

The second, upper, camera takes in itself a known current fuse and / or other electronic modules.

A separation wall is provided between the lower and upper chambers, which can fix the circuit board. This circuit board may also have a trigger circuit.

The plug contact surfaces, which are made of pressed metal material, comprise a stabilizing bend, which is preferably made in the form of an external bend. The bends or plug contact surfaces themselves transition into at least two straight, spaced apart connecting lines, the bottom edges of which contain an input bevel like a chamfer. The findings of the respective ends are parallel to each other.

The findings on the corresponding end lie coaxially on the same line.

The lower chamber is made with the possibility of locking the base, fitted to the outer contour of the spark gap.

In one of the embodiments, the spark gap is made in the form of a hollow cylindrical body, and as a result of this, the base has the shape of a circle or round segments in cross section.

In another embodiment, at least one of the plug contact surfaces has a protrusion at the end opposite the terminals that is electrically connected to the circuit board. Thus, at no additional cost, part of the wiring between the spark gap and, for example, trigger electronics can be implemented.

The support-connection unit proposed by the invention for mechanically or electrically connecting at least one, preferably several, arresters is essentially U-shaped and contains a switching device for potentialless signaling of fault conditions, and also contains contact mates and known connection terminals themselves .

The protrusions extend substantially perpendicular upward from the base of this support assembly, into which the corresponding connecting terminals in the recess provided therein are guided.

The connection terminals comprise a mating contact piece that has a U- or V-shape with an opening directed from the base.

Between the cheeks of the corresponding reciprocal contact parts, a spring shaped part is inserted, which contains a guide bend, which, when the arrester is installed, is reciprocal to its output.

Further, at the base of the support assembly, recesses or steps are provided having a U- or V-shape that matches the shape of the mating contact parts in order to fix them in the horizontal direction.

The first jaw of the reciprocal contact part passes into the corresponding connecting terminal or connected to it. The second cheek of the reciprocal contact part contacts its inner side over a large area or over the entire area with the corresponding, also flat, terminal of the mounted arrester.

Response contact details can be made in the region of their U- or V-shape, similar to the pins 9 located at a distance from each other, also at a distance from each other, that is, with current separation.

A plurality of connection terminals with reciprocal contact parts may be provided in the support assembly for modular combination arresters in order to connect the plurality of arresters in parallel to each other.

For CT grounding systems, an internal ground / neutral conductor bridge is provided, this bridge being in the form of a metal shaped part in the space between the two arrestor sockets and connected to the corresponding contact part with a power circuit, preferably through rivets.

The corresponding second cheeks of the pair of the mating contact piece may have an inclined portion extending in width.

Inclined sections of the second cheek of the corresponding pair can be made in another embodiment, directed towards each other.

The shape of the obliquely extending portions is selected as a response to the element of the lower side of the U-shaped support node in the area of the connecting terminals in order to center them. Further, inclined portions facilitate easy installation of the arrester in the base, equipped with mating contact parts.

Brief List of Drawings

The invention is further explained in more detail on the basis of an implementation option, as well as using the figures.

They show the following.

Figure 1: axonometric projection of a plug-in arrester with an explicitly shown current fuse, spark gap and a structural unit of two chambers.

Figure 2: view of the base of the support node with connecting terminals and an internal bridge "ground / neutral conductor".

Figure 3: view of the arrester with the side walls of the upper chamber and with the shown protrusion for the passage of current emerging from the spark gap to the electronic elements on the circuit board.

Figure 4: a detailed view of the response contact part of the U-shape with an already inserted arrester, the output of which has reached its final position in the U-shaped portion of the response contact part.

5: a perspective view of a U-shaped support assembly to which several arresters can be connected.

Fig.6: view of the lower side of the U-shaped support node, and the part shown here is worn or mounted on the base according to Fig.2.

Fig.7: view of the entire device as a combined arrester, for example, for earthing systems TT.

The implementation of the invention

The plug-in arrester according to figures 1 and 3 contains a first lower chamber 1, which receives, for example, an encapsulated spark gap 2.

The ends of the lower chamber 1 are formed by plug-in contact surfaces 3 or limited to similar metal plug-in contact surfaces 3.

The plug contact surfaces 3 by means of a screw connection are electrically and mechanically connected to the corresponding electrode of the spark gap 2.

The second, upper, chamber 4 may have a current fuse 5, a malfunction indicator not shown, or other electronic components.

Between the lower and upper chambers there is a separation wall 6, for example, of plastic material, on which a mounting plate 7 is mounted. The mounting plate 7 is preferably made in the form of a conductive plate and can mechanically carry the specified current fuse 5 and provide its electrical connection.

The plug contact surfaces 3 have a stabilizing bend 8 to provide stability, which in the shown example is directed outward.

Further, the plug-in contact surfaces 3 pass into at least two conclusions 9 located at a distance from each other, the lower edges of which have an input bevel 10. Further, the conclusions 9 of the respective ends are parallel to each other.

The conclusions of the corresponding ends are aligned in one line, that is, they pass along one straight line.

The lower chamber 1 is made with the possibility of closing the bottom 11, fitted to the outer contour of the spark gap 2 and preferably made of plastic material.

On the bottom 11, protrusions 11.1 can be made, which, when a plug-in arrester is inserted into the base, forms a stop.

The upper chamber 4 has two side walls 12 extending from the partition wall 6 parallel up. Thus, the plug-in arrester can be completely closed with a simple cover, as can be seen from the presented in Fig.7.

At the end opposite at the terminals 9 of the at least one of the plug contact surfaces, a protrusion 13 is made, which is electrically connected to the circuit board 7. Thus, the necessary potential can be applied to the trigger circuit and / or to the current fuse.

The support assembly for mechanically or electrically connecting at least one, preferably several, plug-in arresters is explained in more detail based on FIGS. 2, 4, 5 and 6.

The protrusions 15 located at a distance from each other almost perpendicularly upward from the base 14 of the support assembly, which guide the respective connection terminals 16 and are mounted with anti-shear fixation.

The connection terminals 16 comprise a U-shaped mating contact part 17, namely with a free hole directed upward from the base 14.

Between the cheeks 18 of the respective mating contact parts 17, a spring shaped part 19 is inserted that includes a guide bend 20. The spring shaped part preferably consists of a stamping and flexible element that is held in shape without being dropped between the cheeks 18 of the mating contact part 17.

The guide bend 20 points with its open end in the direction of the corresponding connection terminal, and thus free space is created for introducing and installing the arrester with its terminals 9.

Additionally, in the base 14 there are provided recesses having a shape that matches the shape of the mating contact parts in order to fix them in addition to the protrusions 15.

The first cheek 18.1 of the reciprocal contact part 17 passes into the corresponding connecting terminal 16 or connected to it, the second cheek 18.2 with its inner side over a large area in contact with the corresponding terminal 9 of the installed arrester.

Response contact parts 17 in the region of their U-shape are made with current separation similar to spaced terminals 9 (see figure 2).

At the base, according to the view of FIG. 2, two opposite rows of connecting terminals or connecting elements with mating contact parts can be arranged in order to connect several arresters in parallel to each other.

For CT grounding systems, an internal ground / neutral conductor bridge 200 is provided, and this ground / neutral conductor bridge 200 is in the form of a metal shaped part in the space between the two discharger sockets and is connected to the corresponding contact contact part 17 with a power circuit, preferably through riveting.

Corresponding second cheeks 18.2 of the pair of reciprocal contact parts may have a beveled portion 21 along their width (see FIG. 2). These beveled sections can, as shown in FIG. 2, be directed at each other. Due to the beveled execution relative to the width of the corresponding jaw 18.2 when installing the arrester, not all of terminal 9 enters along its entire width into the frictional contact, which must be overcome, but only a small area in width.

The shape of the obliquely extending portions 21 can be selected as a response element 24 of the lower side 23 of the U-shaped housing 22 in the area of the connecting terminals in order to align them. Such an embodiment of element 24 is shown in FIG. 6. The beveled surfaces shown have a shape similar to the beveled portions 21 of the second cheeks 18.2. As a result, the aforementioned alignment occurs when donning the part 22 on the bottom 11, supplemented by connecting terminals and a bridge.

In the image of the complete device assembly shown in Fig. 7, a total of four arresters forming one combined arrester are connected by a reference node. This node has the necessary internal wiring using the specified bridge. The grip surfaces 25 having corrugations facilitate the easy grip and extension of the respective arresters, and there is no need to use an auxiliary tool.

Claims (13)

1. A plug-in arrester containing one or more surge protection elements, wherein the surge protection elements are located in a structural unit with an optical fault indication, and also comprising a thermal current fuse, which contains an actuating device for triggering an alarm contact, which serves for alarming faults, characterized the fact that the structural unit contains two chambers, the first lower chamber (1) taking in the encapsulated spark gap or under a prefabricated structure (2), and the ends of the lower chamber are formed or limited by plug-in contact surfaces (3), which are electrically connected to the spark gap (2), and then the second upper chamber (4) receives a current fuse (5), and between the lower and the upper chamber (1; 4) is provided with a dividing wall (6) that fixes the mounting plate (7), and the plug-in contact surfaces (3) contain a stabilizing bend (8) and pass into at least two inputs (9), the lower edges which contain the input bevel (10), and the output The respective ends extend parallel to each other. 2. The arrester according to claim 1, characterized in that the terminals (9) at the respective ends are aligned relative to each other. 3. The arrester according to claim 1 or 2, characterized in that the lower chamber (1) is made with the possibility of closing the bottom (11), fitted to the outer contour of the spark gap (2). 4. The arrester according to claim 1 or 2, characterized in that the upper chamber (4) has two side walls (12) extending parallel from the dividing wall (6) upward. 5. Arrester according to claim 1 or 2, characterized in that at the end opposite to the terminals (9), at least one of the plug contact surfaces (3) has a formed protrusion that is electrically connected to the circuit board (7). 6. Support node for mechanically or electrically connecting at least one, preferably several plug-in arresters, as claimed in any of the preceding paragraphs, U-shaped with a switching device for potential-free signaling of fault conditions, with mating contact parts and with connecting terminals, characterized in that protrusions (15) extend from the base (14) at a distance from each other, into which the corresponding connecting terminals (16) are guided, and connecting to The volumes (16) contain a mating contact part (17) of a U-shape or V-shape with an opening directed from the base (14), and a spring shaped part (19) is inserted between the cheeks (18) of the corresponding mating contact parts (17), containing a directing bend (20), which, when installing a spark gap, is in response to its output (9). 7. Support node according to claim 6, characterized in that in the base (14) there are recesses having a U- or V-shape that corresponds to the shape of the mating contact parts (17) in order to fix them. 8. The support node according to claim 6 or 7, characterized in that the first jaw (18.1) of the reciprocal contact part passes into the corresponding connecting terminal or is connected to it, and the second jaw (18.2) contacts the corresponding terminal with its inner side over a large area ( 9) installed arrester. 9. The reference node according to claim 6 or 7, characterized in that the mating contact parts (17) in the region of their U- or V-shape are made with current separation similar to the distant terminal (9). 10. The support node according to one of claims 6 or 7, characterized in that it contains several connection terminals (16) with mating contact parts (17, 18.1, 18.2) in order to connect several arresters in parallel to each other, and for CT earthing systems an internal ground / neutral conductor bridge (200) is provided, and this ground / neutral conductor bridge (200) is in the form of a metal shaped part in the space between the two discharger sockets and is connected to the corresponding contact part (17) with a power closure eat, preferably through riveting. 11. Support node according to claim 9, characterized in that the corresponding second cheeks (18.2) of the pair of mating contact parts (17) have a beveled portion (21) in width. 12. The support node according to claim 11, characterized in that the beveled sections (21) of the second cheeks of the corresponding pair are directed towards each other. 13. The support node according to claim 11 or 12, characterized in that the shape of the obliquely extending portions (21) is selected as a response element of the lower side (23) of the U-shaped housing (22) in the region of the connecting terminals in order to center them.

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