WO2016110359A1

WO2016110359A1 - Overvoltage protection device with a mechanical disconnector that is activated in the case of a thermal overload

Info

Publication number: WO2016110359A1
Application number: PCT/EP2015/077614
Authority: WO
Inventors: Li HONGJUN; Xu NIANSHENG
Original assignee: Dehn + Söhne Gmbh + Co. Kg
Priority date: 2015-01-09
Filing date: 2015-11-25
Publication date: 2016-07-14
Also published as: ES2821248T3; EP3243209A1; CN107112101B; PL3243209T3; SI3243209T1; DE102015000329B3; CN107112101A; EP3243209B1

Abstract

The invention relates to an overvoltage protection device with a mechanical disconnector that is activated in the case of a thermal overload, the disconnector comprising connection elements which can be moved by means of a spring-loaded slider from a closed position into a current-interrupting position, wherein the closed position of the connection elements is maintained by a solder material. The connection elements consist of a pair of shaped metal pieces, wherein the slider is fitted along with a pretensioning spring in the clear space between the shaped pieces. According to the invention, a supporting body is provided, on the bottom side of which apertures for external connection parts are formed, wherein the supporting body has opposite from the bottom side an opening for introducing the overvoltage protection unit. Furthermore, above the bottom side there is a chamber, which receives the shaped metal pieces, the slider and the pretensioning spring, wherein the respective contact lug of the overvoltage protection unit protrudes into the chamber. The slider has a first arm, directed towards the bottom side, and a second arm, directed towards the opening side, wherein the second arm goes over into a portion for optical signalling and the first arm goes over into a portion for triggering a fault indicating device.

Description

Surge protection device with mechanical disconnection device activated in thermal overload failure

description

The invention relates to an overvoltage protection device with activated in thermal overload case mechanical cutting device _» this comprising Änschiusselemente which are moved by means of spring loaded or biased slide from a closed to a current interrupting or potential separating position, wherein the closed position of

Furthermore, the connecting elements consist of a pair of metallic brackets, the ends of which extend substantially parallel and receive the respective contact lugs of the surge protection unit, the ends of the brackets facing away from the surge protection unit, including a free space,

can be connected to each other and have a section for external connection parts, in the free space of the slider is used with biasing spring, wherein the spring bias is oriented towards the contact lug of the overvoltage protection unit, further, the slider has a wedge shape and / or portions of the metallic strap an inclined surface to slide movement to generate a force component on the parallel ends of the stirrups, so that they are movable away from the contact lug, wherein in the region of the parallel ends of the bracket and the contact lug, the solder or adhesive connection is formed, and further the slider has a portion for optical Having signaling of the respective slide position and below this portion of the movable slide a releasable from the slider further surface for optical signaling of the separation state is provided, according to the preamble of claim 1.

From DE 10 2007 042 991 Al a generic surge protection device is activated in thermal overload case mechanical Separating device known. There, in particular, the solder connection point of the connection elements, which is opened in the separation case, not constantly subject to the action of a mechanical force-side load. A further object according to DE 10 2007 042 991 A1 was that the

Connecting elements of the separator so auszufü listen that results in a sufficient surge current carrying capacity, wherein the contact pressure for the discharge by the surge current itself is to produce.

In this regard, the known separation device is structurally designed so that the power supply to the voltage-limiting overvoltage protection units, in particular varistors, is formed by two of the surge current flowing in the same direction conductor sections in the

End region substantially parallel and in a common

Joint, which is secured by a Lot, pass over.

Due to the parallel current flow and the associated force effects in the surge current case, the sections of the conductors or brackets and cause at this time the desired increase in the contact force at the

Lotverbindungsstelle, Dam it is possible to interpret the Lotstelle only for fixing the respective sections of the bracket. The same thing makes it possible to limit the mechanical dimensioning of the soldering point to an absolute minimum and thus to make it particularly thermally sensitive. Thus, the Lotstelle has only a very small heat capacity.

The connection elements of the prior art, which consist of a pair

stream-dividing metallic bracket can be made of a mechanically less solid material. Due to the division into the parallel current paths, the dimensioning of the conductor sections can be carried out more cost-effectively, since the current density is halved.

A spring of the known separation device has the task, in the case of melting the Lotstelle the aforementioned slide between the

To shift current paths and thus to interrupt the circuit. The spring force can be reduced so that the desired low

Continuous load of Lotstelle results. By a wedge-shaped design of the slide, the separation process can be supported. In an embodiment of the teaching according to DE 10 2007 042 991 AI provided as varistors Overvoltage protection units are encapsulated separately, whereby only the material of this housing encapsulation must meet special thermal and electrical requirements, the known slider has at one

Embodiment, a substantially planar surface portion for optical signal isierung the respective slide position, and with respect to ei n corresponding window, the Au ßengehiuse is operable. Below this surface portion of the movable slider is provided by the slider releasable further surface for optical signaling of the separation state. The surface portion of the slider and this further surface are designed in different colors.

Finally, the foot of the slide according to DE 10 2007 042 991 AI has a guide groove to a Verkka nten in the movement to be executed towards the separation of the metallic brackets! to prevent .

DE 10 2013 006 052 A1, which provides a continuation of teaching according to DE 10 2007 042 991 A I, also relates to an overvoltage protection device with at least one overvoltage protection unit and at least one

Contact strip and a mechanical Äbtrennvorrichtung activated in the thermal overload case, The separating device comprises a connecting element, which by means of a spring-biased slide of a

Closed i n a current-interrupting position is movable, Also there is the connection element from egg nem Paar stromtei lender metallic bracket whose directed to the contact lug of the overvoltage protection unit ends parallel and i n their center record the respective contact lug of the overvoltage protection unit.

In order to avoid the fact that, as shown in DE 10 2007 042 991 A1, the slide is coupled functionally with the optical signaling of the slide position and thus an indication of the functional properties of the Äbtrennvorrichtung is proposed according to DE 10 2013 006 052 AI, At least one of the stirrups makes an attachment for one axis

pivoting the display is released, wherein the pivoting movement is released, when with the aid of the slider, the para-lel ends of the stirrups are laterally removed from the contact path. The cited solutions of the prior art have in common that the actual mechanical separation devices are arranged at some distance laterally or at the top of a plug-in surge protection device, with the result that in particular when flowing very high

Surge currents result in extremely high electromotive forces, which can lead to destruction of the overall arrangement. If an inner housing for protecting the overvoltage protection units, in particular the varistors, is provided in this respect, on the one hand the technological problem of introducing the varistors in the assembly and production process and, on the other hand, the disadvantage that little space remains for the attachment of identification areas for color status signaling.

From the foregoing, it is therefore an object of the invention to provide a further developed surge protection device in the thermal overload case activated or activatable mechanical separating device, which is particularly inexpensive to install and thus can be produced and which has a high surge current resistance in the range of 80 kA.

The object of the invention is achieved with a surge protection device according to the combination of features according to claim 1, wherein the dependent claims at least expedient embodiments and

Developments include.

It is therefore assumed that an overvoltage protection device activated or activated in thermal overload case mechanical separation device. The severing device comprises connecting elements, which by means of spring loaded or biased slide of a

closed in a current-interrupting or potential-separating position are movable. In the closed position, the connection elements are secured by a solder or a thermally releasable adhesive.

The connecting elements are preferably made of a pair of metallic brackets whose ends are parallel and, preferably in their middle, the respective

Record the contact lug of the overvoltage protection unit, in particular a varistor. The ends of the stirrups facing away from the overvoltage protection unit can be connected to one another, including a free space, and have a section for external connection parts,

In the free space is the actual slider with biasing spring, the spring bias is oriented towards the contact lug of the overvoltage protection unit.

Preferably, the slider has a wedge shape and / or sections of the bracket have an inclined surface to generate a force component on the parallel ends of the bracket when moving the slider, so that they are movable away from the contact lug, wherein in the region of the parallel ends the bracket and the contact lug the aforementioned solder or adhesive connection is formed.

Furthermore, the slider has a portion for optical signaling of the respective slide position and it is provided below this portion of the movable slide releasable from the slider further surface for optically signaling the Ablösennzustands.

The slider may also have the shape of an M in one embodiment of the invention or be approximated to the shape of an M.

According to the invention, a special support body is provided, by means of which all essential elements of the overvoltage protection device can be mechanically connected and mounted.

The required material for the support body must meet the specific electrical and mechanical properties, whereas a housing encapsulation may consist of a cheaper material.

The support body has on its bottom side openings for the outer

Connection parts, wherein the bottom side opposite part of the

Supporting body has an opening for introducing the overvoltage protection unit.

The outer connection parts can be formed as plug contacts, for example in U- or V-shape, for safe electrical contact of the Plug-part designed overvoltage protection device based on a base part.

Above the bottom side of the support body is a chamber containing the pair of metallic stirrups, the slider and the bias spring, i. the means for thermal separation device receives, wherein the respective contact lug of the overvoltage protection unit protrudes into the chamber.

The slide according to the invention has a first arm, directed to

Bottom side, and a second arm, directed to the opening and thus to the top of the support body.

The second arm passes into the optical signaling section and the first arm enters a perturbation remote triggering section.

Thus, the slider supplemented with the arms takes over not only the function of power interruption in case of failure, but also the display of the

State of the respective surge protection device along with remote signaling of this state.

The further area, which can be opened by the slider, for optically signaling the disconnection state, which is e.g. can be kept in red coloration, according to the invention as an extension of the opening of the support body partially covering sides wall section is formed.

It is inventively provided that the extension with side wall portion is designed to be elastically movable and in particular extension and Settenwandabschnitt are connected via a foil hinge with the support body.

Mounting side can be through the top opening of the support body and lateral pushing away the extension with Settenwandabschnitt a

Insert appropriate varistor block or a combination of several varistors in the support body. In the retracted state, the extension moves back with Settenwandabschnitt and covers the opening at the Top of the support body according to the size of the formation of the extension from.

The second arm runs in a flat return or one

corresponding shape in the support body. Zwischi return and second arm are designed to guide. These means can be realized in the manner of a tongue and groove guide.

The overvoltage protection unit consists in a preferred embodiment of the invention of an electrically and mechanically connected in parallel arrangement of a plurality of varistors,

The first arm dives with its free end in a recess in the

Bedenplatte the support body and locks a pin of Fernmeldesigna lisierungseinrichtung. This pin is located in a known per se base member or socket, which serves to hold one or more surge protection devices, which are designed as a plug-in part.

The support body is surrounded by the release of the bottom side of a housing capsule, the top of the housing capsule a window for

Detection of the state of the separating device has.

The aforementioned chamber is thermally decoupled from the rest of the supporting body and the overvoltage protection device by winds. The only direct thermal connection is via the contact lug of the respective at least one overvoltage protection unit projecting into the chamber, in particular in the form of one or more varistors.

For receiving the biasing spring in the movable slide a cavity for receiving one end of the spring is formed.

The substantially parallel ends of the connecting elements are, as already mentioned, fixed in position by solder or adhesive and strive when

Separation process by their mechanical stress apart.

In a preferred embodiment of the invention, the bow-shaped connection elements are formed symmetrically. In the separation case, the slider moves into the solder or adhesive connection area and penetrates this area, so that soldering fills and thus an unsafe separation can be avoided.

The slider is just like the support body of an electrically insulating material,

The invention will be explained in more detail below with reference to AusfOhrungsbeispielen and with the aid of figures.

Hereby show:

Figure 1 is an exploded view of the overvoltage protection device, designed as a plug-in part.

Fig. 2 is a perspective view of the assembled unit on the basis of a support body still without housing encapsulation;

Fig. 3 is a detail view of the slider with first and second arm;

Fig. 4a is a representation of the support body without recorded

Overvoltage protection unit, but using a

Foil hinge laterally bent extension with corresponding side wall section;

Fig. 4b is a representation similar to that of Figure 4a, but with

moved back extension with side wall portion;

Fig. 5 is a schematic diagram of the forming current path in

Operating case of the surge protective device;

Fig. 6a is a schematic diagram of the slider with arm and the pair

metallic bracket whose ends run parallel and record the respective contact lug of the overvoltage protection unit; Flg. Fig. 6b is a view similar to that of Fig. 6a, but in the severed condition, ie the condition in which the slider has moved the metallic stirrups to a severed position;

Fig. 7a is a perspective view of two surge protection devices, designed as a plug-in part, which are located in a base part, with teilwegbrupter representation for better

Recognizability of the state of the thermal separation device, and that according to Fig. 7a in the non-separated state and after

Fig. 7b in the separated state.

The trained as a plug-in part surge protection device 2 of FIG. 1 consists of the main components supporting body 16, complete slide 4 with section 7 for optical signaling of the respective state of

Separating device, the two outer terminals formed as plug contacts 13 and 14, wherein the connecting part 14 includes the metallic strap of the mechanical separating device, further with a

Bias spring 27, the one of an end 20 of the slider 4 partially

is received, the overvoltage protection unit 11 with the contacts 18 and 19 and to the bottom side of the support body 16 facing contact 17. In the example shown, the overvoltage protection unit 11 comprises two mechanically and electrically connected in parallel varistors 21st

In addition, a side wall of the support body 16 and a

corresponding side wall portion 26 is provided with an angled extension 12 which covers the opening of the support body 16 over a range. This side wall portion 26 with extension 12 is designed to be elastically movable via a foil joint, not shown, so that, as with the

Arrow symbolizes the overvoltage protection unit 11 in the

Support body 16 can be inserted.

The correspondingly completed, shown in Fig. 2, quasi-functional arrangement is then enclosed by a housing encapsulation 10, which has a viewing window 8 based on the recognizability of the state of the device arrangement. The outer connection parts 13 and 14 preferably have a U-shape in their plug-in section 22.

From the overall view of the figures can be understood that the bottom side 160 of the support body 16 openings for the outer connection parts 13; 14, wherein the bottom side 160 opposite the support body 16 has an opening 170,

The portion of the slider which comes into contact with the region of the metallic brackets may have wedge-shaped surfaces and have a shape in the form of an M.

Above the bottom side 160, there is a chamber 180 which receives the pair of metallic stirrups (14 of Figure 2), the actual slider, particularly the portion 20 and the biasing spring 27, with the respective tab 17 of the overvoltage protector unit 11 into the chamber 180 protrudes.

The slider 4 includes a first arm 200, directed to the bottom side 160, and a second arm 400, directed to the opening 170 and thus to the top of the support body 16th

The second arm 400 transits into the optical signaling section 7 and the first arm 200 enters a fault-triggering device triggering section 5.

The shared by the slider 4 further surface 12 is that of the

Extension of the side wall portion 26.

The second arm 400 extends in a flat recess 401 of the

Supporting body 16, wherein between the recess 401 and second arm 400 means 402 are formed for guiding.

This means 402 may be a projection located in

Connection with the groove 403 in the slide 4 realizes the desired guidance. The first arm 200 engages with its free end 5 in a recess in the bottom side 160 of the support body 16, as can be seen in FIG.

From the illustrations according to FIGS. 1 to 4b of the assembly process of

Overvoltage protection device comprehensible.

The support body 16, which is preferably produced as a plastic injection-molded part, accommodates the overvoltage protection unit 11 in its interior, which can be pushed in via the opening side 170 after swinging away the parts 26 and 12. After introduction and fixing of the contacts 13 and 14 and soldering to the terminals 17, 18 and 19 of the surge protection unit 11 and positioned in advance slide relative to the space between the metallic stirrups of the contact 14 of the primary assembly operation is completed. Subsequently, only the housing encapsulation 10 must be slipped over, with corresponding means being provided for locking in a manner known per se.

FIG. 5 shows by the dashed line 29 the flow of current through the overvoltage protection device, wherein the plug contacts represent a left side contact 22 in FIG. 5 with a longer leg 13 and a right side contact 28 with a shorter leg, wherein the shorter legs in pass over the metallic bracket 14 and are connected to such a metallic bracket. To contact 17 of

Overvoltage protection unit 11 is then realized in the region 23, the necessary, under thermal stress separating or melting solder joint.

The thermal separation device 9 (see Fig. 6b) is located in the illustration of FIG. 5 in the immediate vicinity of the contacts 22 and 28 with the result of reduced electromotive forces in the surge current load case.

The reference numeral 30, the clear distance between the contacts 22 and 28 is symbolized.

With reference to FIGS. 6a and 6b, the functional principle of the thermal separating device will be explained in more detail. The thermal separator 9 comprises as essential

Functional components, the metallic bracket 25, which are preferably components of the contact 14. In Abtrennfall or in the original state strive the bracket 25 apart, as shown in Fig. 6b.

In the normal state, the brackets 25 are closed and soldered to the contact lug 24. In this case, the slider 20 is in the state according to FIG.

With a corresponding increase in temperature, wherein the contact member 17 serves as a heat conductor, dissolves with reaching the melting temperature of the

Solder joint 23. As a result, the brackets 25 spread apart, as shown in Fig. 6b. This spreading takes place by using the biasing force of the spring 27 and the related movement of the slider 20 in the direction of the arrow, shown in Fig. 6b.

With its central notch, the slider 20 comes into abutment with the contact lug 24, wherein the wedge sides of the slider 20 in the space between the respective front end of the bracket 25 and the contact lug

Slide 24 so that the desired separation distance is achievable.

As a result of the movement of the slider 20 also results in a sliding movement of the part 7, which in the separation case, the surface, respectively the extension 12, which is designed differently colored, releases. Via the window 8 in the housing encapsulation 10, this changed state can be reconstructed.

In this regard, reference should also be made to the illustrations according to FIGS. 7a and 7b made aware, wherein in Figs. 7a and 7b still a base part 3 is shown, which receives two plug-in parts 2.

In the illustration according to FIG. 7a, the section 5 of the arm 400 blocks a pin 6 for remote error detection. With a change in position of the slider 4, the pin 6 is released and generates a signal for electrical remote signaling via a contact arrangement, not shown.

Claims

claims

1. Overvoltage protection device with activated in thermal overload case mechanical separating device (9), these comprising connection elements (14), which by means of spring loaded or biased slide (4; 20) are movable from a closed to a current-interrupting or potential-separating position, wherein the closed position of

Furthermore, the connecting elements consist of a pair of metallic brackets (25) whose ends run parallel and receive the respective contact lug (24) of the overvoltage protection unit (11), the ends facing away from the overvoltage protection unit (11) the bracket (25), including a free space, are connectable to each other and have a section for connecting parts, in the free space of the slide (20) with biasing spring (27) is inserted, wherein the spring bias in the direction of the contact lug (24) of the overvoltage protection unit (11) oriented is further, the slider (20) has a wedge shape and / or portions of the respective bracket (25) has an inclined surface to generate a slider component, a force component on the parallel ends of the bracket (25), so that these from the contact lug (24 ) are movable away, being in the range of parallel

The slider (4, 20) has a portion (7) for optical signaling of the respective slide position and below this portion of the movable slide (4) a releasable from the slider further surface for optical signaling of the separation state is provided

characterized in that

a support body (16) is provided on whose bottom side (160) openings for the outer connection parts (13; 14; 22; 28) are formed, wherein the bottom side (160) opposite the support body (16) has an opening (170) for Introducing the overvoltage protection unit (11), further above the bottom side (160) a chamber (180) is located, which receives the pair of metallic brackets (25), the slider (20) and the biasing spring (27), wherein the respective contact lug ( 24) of the overvoltage protection unit (1 1) penetrates into the chamber (180) and the slide (4) has a first arm (200), directed to the bottom side (160), and a second arm (400), directed to the opening (170) and thus to the top of the support body (16) wherein the second arm (400) in the section (7) for optical

Signaiisierung and the first arm (200) in a section (5) for triggering a Störungsfernmeldeeinrichtung (6),

2, overvoltage protection device according to claim 1,

characterized in that

the further area to be optically released by the slide (4; 7)

Signaiisierung the separation state as an extension (12) of the opening (170) of the support body (16) partially covering side wall portion (26) is formed.

3, overvoltage protection device according to claim 2,

characterized in that

Extension (12) with side wall portion (26) are designed to be elastically movable,

4, overvoltage protection device according to claim 3,

characterized in that

Extension (12) with side wall portion (26) via a foil joint with the support body (16) are connected.

5. Overvoltage protection device according to one of the preceding claims, characterized in that

the second arm (400) extends in a flat recess (401) of the support body (16) and between the recess (401) and the second arm (16) means (402) are formed for guiding.

6. Overvoltage protection device according to egg nem of the preceding claims, characterized in that

the overvoltage protection unit (1 1) consists of an electrical and mechanical parallel connection of a plurality of varistors (21).

7. Overvoltage protection device according to one of the preceding claims, characterized in that

the first arm (200) with its free end in a recess in the

Bottom side (160) of the support body (16) is immersed.

8. Overvoltage protection device according to one of the preceding claims, characterized in that

the support body (16), leaving the bottom side (160) of a

Housing capsule (10) is surrounded, wherein the upper side of the housing capsule (10) has a window (8) for Erkennu ng the state of the separating device,

9. Overvoltage protection device according to one of the preceding claims, characterized in that

the Kam mer (180) through walls of the remaining support body (16) and the

Overvoltage protection unit (11) is thermally decoupled.

10. Overvoltage protection device according to one of the preceding claims, characterized in that

in the movable slide (20) is a cavity for receiving one end of the biasing spring (27) is befi ndlich.

11. Overvoltage protection device according to one of the preceding claims, characterized in that

the parallel ends of the bracket (25) are fixed in position by the solder or the adhesive, in the AbtrennVorgang, however, by ei ne mechanical

Diverge own tension.

12. Overvoltage protection device according to one of the preceding claims, characterized in that

the brackets (25) are symmetrical.

13. Overvoltage protection device according to one of the preceding claims, characterized in that

in the separation case, the slider (20) enters the solder or adhesive bonding area and penetrates this area to avoid, in particular, soldering threads.

14. Overvoltage protection device according to one of vora next claims, characterized in that

the slide (20) consists of egg nem electrically insulating Materia l.