DE202018006119U1 - Separating device for a surge arrester - Google Patents

Abstract

Separating device for a surge arrester, which is received by a support body (1) and extending from the support body (1) plug contacts (8; 9), which are connected to at least one arrester element of the surge arrester, further comprising a switching tongue (14), the a first end (140) is connected via a thermal separation point with the arrester element and with a second end (141) with one of the plug contacts (9), one on the support body (1) pivotally mounted under spring tension, insulating separating block (6), wherein the spring bias via the switching tongue (14) acts on the thermal separation point, characterized in that the switching tongue is formed as geradflächiger, elongated, metallic, yielding elastic Abtrennstreifen (14) having a rectangular cross-section, wherein the connection with a contact surface (3) of the Ableiterelementes by means of the thermal separation point on the broad side of a first n Abtrennstreifenendes (140) and the connection with one of the plug contacts (9) over the circumference of a second Abtrennstreifenendes (141), in a slot-shaped recess (15) within a support body (1) facing portion (16) of the plug contact (9 ), wherein the recess (15) is substantially complementary to the cross-sectional area of the second Abtrennstreifenendes (141), wherein further with the reaching of the melting point of the thermal separation point of the Abtrennbock (6) is subject to a positional displacement and thereby the Abtrstreifenstreifen (14) with its first Abtrennstreifenende (140) from the contact point (3) lifts off and the Abtrennbock (6) enters the resulting gap.

Description

The invention relates to a separation device for a surge arrester, which is received by a support body and extending from the support body plug contacts, which communicate with at least one arrester element of the surge arrester, further comprising a switching tongue, at a first end via a thermal separation point with the arrester element and is connected to a second end with one of the plug contacts, a pivotally mounted on the support body, under spring tension, insulating Abtrennbock, the spring bias acts on the switching tongue on the thermal separation point according to the preamble of claim 1.

From the EP 2 011 128 B1 a disconnecting device for a surge arrester is previously known. In this separation device, the switching movement is performed by a switching tongue, which is aligned over a permanently acting spring force in the opposite direction to the holding force produced via a protective solder. The on the tongue or its solder joint for generating a Auslöt- or switching force on a Abtrennb indirectly acting permanent biasing force is supported by at least one further, independently acting biasing force and a complementary switching force with the same direction of action.

The distribution of forces is such that at rest a small resultant force acts on the Lotstelle and the greatest possible resultant force performs the switching movement during the Auslötvorganges by the biasing force in the Auslötphase by the formation of the tongue from a memory or bimetallic strip or a Switch tongue of a spring material, which has an expression with arcuate web, provided and the additional switching force is formed after completion of the Auslötvorganges by shifting a power transmission point of the induced on the switching tongue biasing leverage resulting.

The displacement of the power transmission point is derived from a rotational movement and it has insofar the disconnect block on a pivot bearing.

The switching movement of the previously known switching tongue results from a spring tension which indirectly exerts a bias on the switching tongue and thus the solder pad via the separating block. Due to the rotational movement of the Abtrennbockes the severed switching tongue performs a fast switching movement over a large opening travel and thus provides a secure separation between the arrester element and the cable guide formed by the switching tongue ago. At the same time, the rotational movement carried out by the separating block is displayed in its end position in a viewing window, so that the switching position of the separating block can be recognized on the outside by means of a viewing surface as the triggering state.

The Lotstelle that connects the tongue with the arrester element is designed and manufactured so that the separation takes place safely and at a time when no thermal damage can be foreseen by a superheated discharge element. This point is first determined by the choice of the solder, with the described mechanical bias provides a significant share to it.

At the tongue after EP 2 011 128 B1 several bending and thus deformation sections are provided, which lead to an undesirable increase in current density. For this reason, the known solution is not suitable to safely accommodate high surge currents and high short-circuit currents.

In the overvoltage protection element according to DE 20 2014 103 262 U1 , which is intended for use between a neutral conductor and a potential equalization in the power supply of a low-voltage network, the same has a housing and an overvoltage-limiting component arranged in the housing with two connection contacts for the electrical connection of a current path to be protected.

Furthermore, an electrically conductive connecting element and an insulating separating element and at least one spring element is present.

As overvoltage limiting component, a gas-filled surge arrester is used, wherein the insulating partition member is slidably disposed on the housing and can be moved by the force of the at least one spring element from a first position to a second position.

In the normal state of the overvoltage protection element, the second end of an electrically conductive connection element is electrically conductively connected to the second electrode of the surge arrester via a thermally disconnecting connection, and the insulating separation element is fixed in a first position.

When a predetermined limit temperature of the overvoltage protection element is exceeded, the thermal connection between the second end of the electrically conductive connection element and the second electrode of the surge arrester is separated and the insulating Separating element moves by the force of the spring element in its second position, in which a portion of the separating element between the second end of the electrically conductive connecting element and the second electrode of the overvoltage element is located.

The electrically conductive connecting element is designed as an angled metallic strip and thus has in principle a large current carrying capacity. For the purpose of contacting the conductive connection element with the second connection contact, the abovementioned bend is present, which forms a contact surface which can be connected to the connection contact. Also in this regard, a Stromengstelle is formed in the kink area. A further disadvantage is the rectilinear displacement of the insulating separating element with the risk of tilting in the intended slide guide, in particular when a thermal load of the surge arrester has already occurred.

The state of the art is still on the WO 2005/112 050 A1 as well as the US Pat. No. 9,570,260 B2 directed.

From the foregoing, it is an object of the invention to provide a further developed separation device for a surge arrester, which is constructed in a particularly simple manner and thus inexpensive to produce and based on a shock current or short circuit current leading tongue is capable of extremely high surge currents or short circuit currents respectively.

The object of the invention is achieved by a separation device according to the feature combination of claim 1, wherein the dependent claims represent at least expedient refinements and developments.

The separation device for a surge arrester, which is received by a support body, and extending from the support body plug contacts to the outer terminal, which communicate with at least one arrester element of the surge arrester, has a switching tongue, which at a first end via a thermal separation point with the Ableiterelement and is connected to a second end with one of the plug contacts.

Furthermore, the separating device comprises a pivotally mounted on the support body, under spring tension, insulating Abtrennbock, the spring bias acts on the switching tongue on the thermal separation point.

In the support body, which receives both the discharge element and the actual separation device, it is a plastic injection molded part, which is surrounded by a separate outer housing. The overall arrangement thus formed can be realized as a plug-in part and thus as a replaceable surge arrester, which can be introduced into a conventional base with terminals.

Regardless, the presented separation device according to the invention is also suitable for other types of training of surge arresters with support bodies.

According to the invention, the switching tongue is designed as a straight-surfaced, elongate, metallic, yielding elastic separating strip with a rectangular cross-section.

The cross-sectional area is realized so that a design for maximum surge currents or maximum short-circuit currents is readily possible.

The connection with a contact surface of the arrester element is effected by means of a known thermal separation point, for example via a solder connection.

However, the actual thermal separation point is realized according to the invention over the broad side of a first Abtrennstreifenendes.

The connection with one of the plug contacts, however, takes place over the circumference of a second Abtrennstreifenendes, which dips into a slot-shaped recess within a pointing to the support body portion of the plug contact.

In this regard, the recess is substantially complementary to the cross sectional area of the second separator strip end.

It is therefore inserted the second Abtrennstreifenende into the recess with a rectangular cross-section and fixed there, for example, cohesively.

With the achievement of the melting point of the thermal separation point of the Abtrennbock subject to a position shift, due to the spring preload.

As a result, the separation strip is lifted with its first Abtrennstreifenende of the contact point. The severance block then enters the resulting space and results in a safe separation.

The emergence of a possible arc is thus avoided or suppressed from the beginning.

The separation block itself is designed as a rotary lever. The axis of rotation is here at one end, which is opposite to the point of attack for generating the spring preload with the result of a corresponding increase in force on the located between the axis of rotation and the point of application for the spring preload position of the thermal separation point.

The positional displacement of the separation block can be seen through a viewing window in an outer housing enclosing the support body, so that the respective state of the surge arrester can be reconstructed.

In one embodiment of the invention, a guide lug for receiving the second Abtrennstreifenendes is formed on the support body.

The second Abtrennstreifenende is soldered or welded in an embodiment of the invention with the plug contact.

Again ausgestaltend the separation block is designed as a rotary valve and provided at its pointing to the thermal separation point edge with a flattening in the form of a simple inclined surface or a wedge surface. This results in a fast and secure separation of the contact surfaces connected by solder using the elasticity of the trained as a separation strip tab. The separation strip is claimed in the separation movement only in its elastic range. Plastic deformations neither occur nor are necessary on the production side.

Due to the lever-reinforced forces acting on the thermal separation point may be overcome by solder residues or rough material surfaces or other bumps may arise during the melting process.

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

• 1 eine perspektivische Ansicht eines Steckteiles eines Überspannungsableiters ohne Außengehäuse und ohne Unterteil, jedoch mit äußeren elektrischen Schraubanschlussklemmen im funktionsbereiten, das heißt nicht abgetrennten Zustand;
• 2 eine Darstellung ähnlich derjenigen nach 1, jedoch im abgetrennten Zustand, wobei sich hier der Abtrennbock bereits positionsverlagert hat und in den Zwischenraum zwischen Kontaktstelle und Abtrennstreifen eingetaucht ist;
• 3 eine Detailansicht zur Ausbildung der Verbindung eines der Steckkontakte über den Umfang eines zweiten Abtrennstreifenendes, welches in eine schlitzförmige Ausnehmung innerhalb eines zum Tragkörper weisenden Abschnittes des Steckkontaktes eintaucht.

Hereby show:

• 1 a perspective view of a plug-in part of a surge arrester without outer housing and without bottom part, but with external electrical screw terminals in the functional, that is not separated state;
• 2 a representation similar to that after 1 , but in the separated state, in which case the separation block has already moved in position and is immersed in the space between the contact point and separation strip;
• 3 a detail view for forming the connection of one of the plug contacts over the circumference of a second Abtrennstreifenendes, which dips into a slot-shaped recess within a portion of the plug contact facing the support body.

The separating device according to the invention according to the embodiment may be part of a surge arrester in the form of a plug-in part, as shown in the 1 and 2 is indicated.

The plug-in part shown here still has no outer housing to make clear the structure and function of the separating device.

The male part has a support body 1 which has on one side a chamber-like recess which has at least one arrester element.

The support body has a breakthrough 2 which gives access to a contact point 3 allowed the arrester element.

In this area, the known per se thermal separation point is realized.

Furthermore, the support body 1 a curved guide 4 for receiving a biasing force generating spring 5 on. Furthermore, it should be noted that the spring 5 at one end to a stop of a trained as a rotary valve insulating Abtrennbockes 6 supported.

The rotary valve sits on the axis of rotation 7 , as an extension and thus integral element of the supporting body 1 can be executed.

External connections of the surge arrester are plug-in contacts 8th ; 9 executable, in U-shaped mating contacts 10 and 11 intervention.

The mating contacts 10 and 11 stand with known external connection screw terminals 12 and 13 in conjunction or are part of this.

According to the invention, the switching tongue of the thermal separation point as geradflächiger, elongated, metallic, yielding elastic separation strip 14 educated.

The connection with the contact surface 3 the Ableiterelementes as explained by means of thermal separation point, over the broad side of a first Abtrennstreifenendes 140 ,

The connection with one of the plug contacts 9 on the other hand takes place over the circumference of a second Abtrennstreifenendes 141 that forms a slot-shaped recess 15 in an extension section 16 of the plug contact 9 dips.

The recess 15 here corresponds essentially to the cross-sectional area of the second Abtrennstreifenendes 141 and is complementary to this end.

A corresponding detail is the 3 removable.

Upon reaching the melting point of the thermal separation point is subject to the separation block 6 a position shift; this is in the 1 and 2 traceable via a movement to the left.

This raises the separation strip with its first Abtrennstreifenende 140 from the contact point 3 from. Furthermore, the separation block occurs 6 with his area 60 into the resulting space (see 2 ).

The position shift of the separation block 6 is about a not shown in the figures window in a non-illustrated, the support body 1 enclosing outer housing recognizable.

In this regard is at the separation block 6 a display area 61 formed.

The breaker 6 is how out of that 1 and 2 comprehensible, designed as a rotary valve. At its edge facing the thermal interface 62 can the severance block 6 have a flattening in the form of an inclined surface or a wedge surface in order to optimize the penetration into the separation area and the separation process.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2011128 B1 [0002, 0007]
• DE 202014103262 U1 [0008]
• WO 2005/112050 A1 [0014]
• US 9570260 B2 [0014]

Claims (6)

Separating device for a surge arrester, which is received by a support body (1) and extending from the support body (1) plug contacts (8; 9), which are connected to at least one arrester element of the surge arrester, further comprising a switching tongue (14), the a first end (140) is connected via a thermal separation point with the arrester element and with a second end (141) with one of the plug contacts (9), one on the support body (1) pivotally mounted under spring tension, insulating separating block (6), wherein the spring bias via the switching tongue (14) acts on the thermal separation point, characterized in that the switching tongue is formed as geradflächiger, elongated, metallic, yielding elastic Abtrennstreifen (14) having a rectangular cross-section, wherein the connection with a contact surface (3) of the Ableiterelementes by means of the thermal separation point on the broad side of a first a Abtrennstreifenendes (140) and the connection with one of the plug contacts (9) over the circumference of a second Abtrennstreifenendes (141), which in a slot-shaped recess (15) within a support body (1) facing portion (16) of the plug contact (9 ), wherein the recess (15) is substantially complementary to the cross-sectional area of the second Abtrennstreifenendes (141), wherein further with the reaching of the melting point of the thermal separation point of the Abtrennbock (6) is subject to a positional displacement and thereby the Abtrstreifenstreifen (14) with its first Abtrennstreifenende (140) from the contact point (3) lifts off and the Abtrennbock (6) enters the resulting gap. Separator after Claim 1 , characterized in that the separating block (6) is designed as a rotary lever. Separator after Claim 1 or 2 , characterized in that the positional displacement of the Abtrennbockes (6) via a viewing window in a the support body (1) enclosing outer housing can be seen. Separating device according to one of the preceding claims, characterized in that on the support body (1) a guide projection (100) for receiving the second Abtrennstreifenendes (141) is integrally formed. Separating device according to one of the preceding claims, characterized in that the second Abtrennstreifenende (141) with the plug contact (9) is soldered or welded. Separating device according to one of the preceding claims, characterized in that the separating block (6) is designed as a rotary slide and at its edge facing the thermal separation point (62) has a flattening in the form of a simple inclined surface or wedge surface.

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