EP0130403A1 - Arrester holder to be inserted into connector rails per tele-communication - Google Patents

Abstract

The invention relates to a heat protection device for LSA-PLUS terminal block surge arrester magazines (3) which are equipped with two-way arresters (13) or with button arresters (23). Subsequently, when installing a two-way arrester (13), an S-shaped bow spring (1) or when installing a button arrester (23) of type 6 × 6 or 6 × 8, an L-shaped bow spring (2) is used, which is attached to one leg (1a or 2a) has a solder pill (10 or 20) and a switch contact (11 or 21). In the event of an overvoltage, the arc that arises in the arrester (13; 23) is short-circuited with this limb (1a or 2a), since the solder pill (10 or 20) melts away when the heat is prolonged.

Description

The invention relates to a device for heat protection in in with solderless, screwless and stripped contacts with polytropic air gap (KRONE-LSA-PLUS contacts equipped terminal strips to plug-in magazines built-in surge arresters (short: LSA-PLUS magazines).

Thermal protection for surge arresters is known from DE-OS 25 55 794 and from DE-PS 24 28 266. In these slide-in magazines for separating strips, the arresters and the magazine are protected by a solder pill lying on the front side, which melts away at high temperatures.

The overvoltage current is conducted to earth potential by short-circuiting the arrester.

The object of the invention is to provide thermal protection for the two-way surge arresters installed in the LSA-PLUS plug-in magazines and for the button arresters of the 6x6 and 6x8 designs. In the event of an overvoltage, in the event of a long-lasting overvoltage current, the thermal protection should short-circuit the arc that arises in the arrester and thus direct the overvoltage current to the earth potential. This is to avoid excessive heating of the arrester and thus damage to the surge arrester magazine. Finally, the subsequent installation of such a protective device in known plug-in magazines should be possible.

The object of the invention, with which this object is achieved, is a device for the thermal protection of terminal strips built into plug-in magazines with plug-free soldering, screwing and stripping-free connections with polytropic air gap (= LSA-PLUS contacts), with the characteristic, that for each gas spark gap of a known two-way arrester, an S-shaped bow spring, which has a solder pill on one leg and a switch contact and a latching device on its other leg, can be inserted into a surge arrester magazine or that, alternatively, an L- for the gas spark gap of a known button arrester Shaped bow spring, which has a solder pill on one leg and a switch contact and a latching device on its other leg, can be inserted into a surge arrester magazine.

An embodiment of the first alternative provides that the locking device of the S-shaped bow spring consists of two spring tongues which engage under the two-way arrester.

An embodiment of the second alternative provides that the latching device of the L-shaped bow spring consists of a spring tongue which engages in an opening of a known contact of a contact spring.

The solder pill preferably lies on the outside diameter of the arrester and thereby keeps the switching contact at a distance from a respective earth potential.

It is expedient for the solder pill to be clamped during operation between the arrester and the bow spring or to be firmly connected to the bow spring by a riveted connection.

• Fig. 1 den oberen Teil eines Überspannungsableitermagazins mit eingebautem Zweiwegeableiter und mit zwei S-förmigen Bügelfedern im Schnitt;
• Fig. la die Draufsicht nach Fig. 1;
• Fig. 2 den oberen Teil eines Überspannungsableitermagazins mit zwei eingebauten Knopfableitern der Bauform 6x6 (6x8) und mit zwei L-förmigen Bügelfedern im Schnitt;
• Fig. 2a die Draufsicht nach Fig. 2;
• Fig. 3 das Überspannungsableitermagazin für Knopfableiter der Bauform 6x6 oder 6x8 im Schnitt; und
• Fig. 4 das Überspannungsableitermagazin für Zweiwegeableiter im Schnitt.

The invention is explained in more detail with reference to the exemplary embodiments shown in the drawings. Show it:

• Figure 1 shows the upper part of a surge arrester magazine with built-in two-way arrester and with two S-shaped bow springs in section.
• Fig. La the top view of FIG. 1;
• Fig. 2 shows the upper part of a surge arrester magazine with two built-in button arresters of the 6x6 (6x8) design and with two L-shaped brackets feathers in the cut;
• 2a shows the top view according to FIG. 2;
• 3 shows the surge arrester magazine for button arresters of the 6x6 or 6x8 design in section; and
• Fig. 4, the surge arrester magazine for two-way arresters on average.

The surge arrester magazine 3 shown in FIGS. 1 and 4 or in FIGS. 2 and 3 is plugged into a known LSA-PLUS terminal block, not shown, for protecting the a and b wires against overvoltages.

In Fig. 1, a surge arrester magazine 3 is shown with a two-way arrester 13, which is inserted with its connecting legs 13a and 13c into the contacts 15b of the contact spring 15.

The middle connection leg 13b is inserted into the earth contact 14a.

In the event of an overvoltage, an arc arises between the poles 16a and 16b of one gas spark gap or 16c and 16b of the other gas spark gap of the two-way arrester 13, which leads to an increase in temperature.

This increased temperature destroys the arrester and leads to severe damage to the surge arrester magazine 3.

In order to prevent this damage, an S-shaped bow spring 1 is inserted according to the invention, which has a solder pill 10 and a switching contact 11 on one leg 1 a and a latching device 12 on its other leg 1 a.

The latching device 12 has two spring tongues 12a which engage under the two-way diverter 13.

Due to this locking and spring action, the S-shaped bow spring 1 is held in the surge arrester magazine 3.

The solder pill 10 provided on leg la can either be riveted or simply clamped between leg la and two-way diverter 13.

Pinching the solder pill 10 has the advantage that when the solder pill melts away, only the solder pill 10 and not the S-shaped bow spring 1 has to be replaced.

Kept stand _- in the installed state of the S-shaped fastening spring 1 is the solder pellet 10 - as well as Figs la shows -. On the outside diameter of the Zweiwegeableiters 13, whereby the switching contact 11 16b to the connected to the ground potential 14 terminal of the Zweiwegeableiters 13 Ab becomes.

In the event of an overvoltage, after the solder pill 10 has melted away, the S-shaped bow spring 1 bridges the poles 16a and 16b or 16b and 16c. As a result, the arc formed in the two-way arrester 13 is short closed, and the overcurrent flows over the earth potential 14. Damage to the two-way arrester 13 and the surge arrester magazine 3 is avoided by this process.

If, instead of the two-way arrester, 13 button arresters 23 of the 6x6 or 6x8 design are required, thermal protection is also possible, namely with an L-shaped bow spring 2.

As shown in FIG. 2, this L-shaped bow spring 2 can also be subsequently inserted into the surge arrester magazine 3.

The button arresters 23 of the 6x6, 6x8 design are - as shown in FIG. 3 - contacted via a contact 25b of the contact spring 25.

The contact 25b has an opening 25a into which the spring tongue 22a of the latching device 22 provided on the leg 2b of the L-shaped bow spring 2 engages.

Analogous to the S-shaped bow spring 1, the L-shaped bow spring 2 is held in the surge arrester magazine 3 by means of latching and spring action.

The solder pill 20 provided on the leg 2a also lies - as FIG. 2a also shows - in the installed state of the L-shaped bow spring 2 on the outside diameter of the button arrester 23, as a result of which the switching contact 21 is kept at a distance from the earth potential 24. Here, too, the solder pill 20 melts in the event of a prolonged overcurrent and when the button arrester 23 is heated, as a result of which the switch contact 21 is connected to the ground potential 24 and thus a short circuit between the poles 26a and 26b of the button arrester 23 is established.

The overvoltage cannot cause damage to the button arrester 23 and the surge arrester magazine 3.

Claims (6)

1. Device for thermal protection of overvoltage arresters installed in magazines fitted with solder-free, screw-free and stripping-free connection contacts with polytropic air gap (= LSA-PLUS contacts),
characterized,
that for each gas spark gap of a known two-way diverter (13) an S-shaped bow spring (1), a solder pill (10) and a switching contact (11) on its one leg (la) and a latching device (12) on its other leg (lb) ) has, can be inserted into a surge arrester magazine (3). 2. Device for thermal protection of overvoltage arresters which are fitted in magazines fitted with solder-free, screw-free and stripping-free connection contacts with polytropic air gap (= LSA-PLUS contacts),
characterized,
that for the gas spark gap of a known button arrester (23) an L-shaped bow spring (2) which has a solder pill (20) and a switch contact (21) on its one leg (2a) and a latching device (22) on its other leg (2b) ) has, can be inserted into a surge arrester magazine (3). 3. Device according to claim 1,
characterized, that the locking device (12) of the S-shaped bow spring (1) consists of two spring tongues (12a) which engage under the two-way diverter (13). 4. Device according to claim 2, characterized in
that the locking device (22) of the L-shaped bow spring (2) consists of a spring tongue (22a) which engages in an opening (25a) of a known contact (25b) of a contact spring (25). 5. Device according to claim 1 or 2, characterized in
that the solder pill (10 or 20) rests on the outer diameter of the arrester (13 or 23) and thereby keeps the switching contact (11 or 21) at a distance from a respective earth potential (14 or 24). 6. Device according to claim 5, characterized in
that the solder pill (10 or 20) is clamped in operation between the arrester (13 or 23) and the bow spring (1 or 2) or is fixedly connected to the bow spring (1 or 2) by a riveted connection.

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