SI20130A

SI20130A - Miniature module for surge protection in power networks

Info

Publication number: SI20130A
Application number: SI9800266A
Authority: SI
Original assignee: ISKRA ZAŠČITE d.o.o.
Priority date: 1998-10-14
Filing date: 1998-10-14
Publication date: 2000-06-30

Abstract

The miniature module for surge protection in power networks consists of a two-piece chassis (1) consisting of a lower (2) and an upper part (3), featuring connection pins (4) reaching through grooves (5) in the connecting area (6). The lower part (2) of the chassis (1) can be assembled with the help of plugs (20) on the upper part (3) of the chassis (1), to fit into openings (11) on the contact panel (10) of the lower part (2) of the chassis (1), as well as by a graded wall (18) on one side of the upper part (3) of the chassis (1), which fits to the graded wall (8) of the lower part (2) of the chassis (1). The thermal circuit breaker (16) is attached with the help of a positioning leg (22) with extensions (14, 15) built into the lower part (2) of the chassis (1). The operation of the thermal circuit breaker (16) is provided by a contact leg (21), which is stress bent and soldered by a soldering bit (26) to the varistor terminal (25).

Description

MINIATURNI MODUL ZA PRENAPETOSTNO ZAŠČITO V ELEKTRIČNEM OMREŽJUMiniature module for overvoltage protection in the electrical network

Izum spada v področje elektrotehnike, in sicer v področje za ureditev zaščite pred prenapetostjo ali prevelikimi tokovi v nizkonapetostnem energetskem omrežju.The invention belongs to the field of electrical engineering, namely to the field of regulation of overvoltage protection or overcurrents in a low-voltage power grid.

Za prenapetostno in tokovo zaščito v energetskem omrežju in napravah se večinoma uporabljajo metaloksidni varistorji, katerim se zaradi prenapetostnih vplivov rušijo električne karakteristike, kar pomeni padanje izolacijske upornosti, nazivne napetosti in slabšanje nelinearnega koeficienta. Posledica poslabšanja električne karakteristike varistorja je povečanje trajnega toka skozi varistor, s tem segrevanje varistorja in okolice, kar ima lahko za posledico poškodbo električne instalacije, naprav in požar okolice.For overvoltage and current protection in the power grid and installations, metal oxide varistors are mostly used, which, due to overvoltage influences, destroy the electrical characteristics, which means a drop in insulation resistance, nominal voltages and a weakening of the nonlinear coefficient. The deterioration of the electrical characteristics of the varistor results in an increase in sustained current through the varistor, thereby heating the varistor and its surroundings, which can result in damage to electrical installations, devices, and the fire of the surroundings.

Tehnični problem je izvedba miniaturnega modula z vgrajenim metaloksidnim varistorjem in termičnim samodejnim odklopnikom faznega dela varistorja od omrežne napetosti.A technical problem is the implementation of a miniature module with a built-in metal oxide varistor and a thermal automatic disconnector of the phase part of the varistor from the mains voltage.

Rešitev po izumu je posebno skonstruirano ohišje, ki je prirejeno za prejem metaloksidnega varistorja in termičnega odklopnika.The solution according to the invention is a specially designed housing which is adapted to receive a metal oxide varistor and a thermal circuit breaker.

Ohišje je sestavljeno iz spodnjega in zgornjega dela, ki sta sestavljena skupaj s pomočjo luknjic na spodnjem delu ohišja in čepov na zgornjem delu ohišja. Spodnji in zgornji del se na osprednem delu stopničasto združujeta (sestavljata), hkrati pa to omogoča pozicioniranje izvodov kontaktov iz modula v različnih višinah.The housing is made up of lower and upper parts, which are assembled together by means of holes in the lower part of the housing and studs on the upper part of the housing. The lower and upper parts are staggered (folded) in the front part, and at the same time this enables the positioning of contacts of contacts from the module in different heights.

Spodnji del ohišja ima prav tako pozicionirane nastavke, ki služijo za pozicioniranje termičnega odklopnika in za pozicioniranje varistorja.The lower part of the housing also has positioned nozzles for positioning the thermal circuit breaker and for positioning the varistor.

Termični odklopnik je izdelan iz pločevine, novega srebra debeline 0,3 mm. Ta je po sredini do polovice dolžine pristrižen, tako da tvori dva kraka, v spodnjem delu pa ima zavihek, da se nanj prispajka izhodni kontakt modula, ki je speljan iz ohišja.The thermal circuit breaker is made of sheet metal, new silver 0.3 mm thick. It is cut in half to half length so that it forms two edges, and in the lower part there is a tab to attach it to the output contact of the module which is driven from the housing.

Varistor je epoksiran z epoksi smolo in leži na pozicioniranih nastavkih. Fiksiranje varistorja je doseženo z dvokomponentnim lepilom nanešenim med varistor in spodnji del ohišja. Iz varistorja sta skozi ohišje modula speljana dva izhodna kontakta modula.The varistor is epoxied with epoxy resin and rests on positioned attachments. The fixation of the varistor is achieved with a two-component adhesive applied between the varistor and the lower part of the housing. Two output contacts of the module are passed through the module housing through the module housing.

Delovanje termičnega odklopnika je doseženo preko segrevanja varistorja, s tem prenosa toplote na kontakt varistorja, kar povzroči topljenje nizkotemperaturne spajke in s tem sprostitev napetega kraka termičnega odklopnika in njegovo odklopitev.The operation of the thermal circuit breaker is achieved by heating the varistor, thereby transferring heat to the varistor contact, which causes the low-temperature solder to melt and thereby release the tensile arm of the thermal circuit breaker and disconnect it.

Tuji proizvajalci kot so SuperSafe, Obo Bettermann, Dehn & Sohne, in drugi, uporabljajo za prenapetostno zaščito tudi metaloksidne varistorje, imajo pa različne rešitve termičnega odklopa. Odklop rešujejo s termičnimi varovalkami ali odklopniki, ki so izvedeni zapleteno in ne zagotavljajo vedno zanesljivega delovanja.Foreign manufacturers such as SuperSafe, Obo Bettermann, Dehn & Sohne, and others also use metal oxide varistors for surge protection, but have different thermal disconnect solutions. Disconnections are solved by thermal fuses or circuit breakers that are complex and do not always guarantee reliable operation.

Izum je prikazan na slikah:The invention is shown in the figures:

Sl. 1 Primer modula v perspektiviFIG. 1 Example module in perspective

Sl. 2 Spodnji del ohišja modula v perspektiviFIG. 2 Bottom of module housing in perspective

Sl. 3 Zgornji del ohišja modula v perspektiviFIG. 3 Top of module housing in perspective

Sl. 4 Sestava modula v spodnjem delu ohišjaFIG. 4 Module assembly in lower housing

Sl. 5 Termični odklopnik v napetem stanju narisan v perspektiviFIG. 5 Tension circuit breaker in perspective

Kot prikazuje sl. 1, je predmetni modul sestavljen iz spodnjega dela 2 in zgornjega dela 3 ohišja 1, iz katerega segajo izhodni kontakti 4, speljani skozi utore 5 na stičnem mestu 6 obeh delov 2, 3 ohišja 1.As shown in FIG. 1, the subject module consists of a lower portion 2 and an upper portion 3 of the housing 1 from which the output contacts 4 extend through the grooves 5 at the junction 6 of both parts 2, 3 of the housing 1.

Spodnji del 2 ohišja 1 (sl. 2) ima na enem koncu 7 stopničasto steno 8 opremljeno z izrezi 9, in stično ploskev 10 opremljeno z luknjicami 11, ter nastavke 72 za pozicioniranje varistorja 13 in nastavka 14, 15 za pozicioniranje termičnega odklopnika 76.The lower part 2 of the housing 1 (Fig. 2) has at one end 7 a stepped wall 8 equipped with cutouts 9, and the contact surface 10 equipped with holes 11, and the nozzles 72 for positioning the varistor 13 and the nozzle 14, 15 for positioning the thermal circuit breaker 76.

Zgornji del 3 ohišja 7 (sl. 3) ima na enem koncu 17 stopničasto steno 18, ki se ujema s stopničasto steno 8 na spodnjem delu 2 ohišja 7, ter na stopničasti steni 78 izvedene utore 79, ki tvorijo z utori 9 na stopničasti steni 8 spodnejga dela 2 ohišja 7 luknje 5 za izhod kontaktov 4.The upper part 3 of the housing 7 (Fig. 3) has a stepped wall 18 at one end 17, which corresponds to the stepped wall 8 at the lower part 2 of the housing 7, and grooves 79 formed on the stepped wall 78, which form grooves 9 on the stepped wall 8 lower part 2 of housing 7 of hole 5 for output of contacts 4.

Zgornji del 3 ohišja 7 ima po robovih razporejene čepe 20, ki so vstavljivi v luknje 7 7 na stični ploskvi 10 spodnjega dela 2 ohišja 7, s čimer je možno sestaviti dela 2, 3 ohišja 7.The upper part 3 of the housing 7 is provided with edges arranged on the edges 20, which can be inserted into the holes 7 7 on the contact surface 10 of the lower part 2 of the housing 7, which makes it possible to assemble the parts 2, 3 of the housing 7.

Sestava modula v spodnjem delu 2 ohišja 7 je prikazana na sl. 4, termični odklopnik 76 pa je prikazan v napetem stanju na sl. 5.The assembly of the module in the lower part 2 of the housing 7 is shown in FIG. 4, and the thermal circuit breaker 76 is shown in the voltage state of FIG. 5.

Termični odklopnik 76 je približno do polovice dolžine prisekan, tako da tvori dva kraka, od katerih je eden kontaktni krak 27, drugi pa pozicionimi krak 22. Kontaktni krak 27 termičnega odklopnika 76 je upognjeno napet in prispajkan z nizkotemperaturno spajko 26 na kontakt varistorja 25 ter je zmožen ob stopljenju spajke 26 dovolj daleč odskočiti od kontakta varistorja 25 in s tem doseči odklop.The thermal circuit breaker 76 is cut in half lengthwise to form two arms, one of which is a contact arm 27 and the other a position arm 22. The thermal circuit breaker contact arm 76 is bent taut and soldered with a low-temperature solder 26 to the varistor contact 25, and is capable of bouncing far enough from the contact of varistor 25 to reach disconnection 26 in order to achieve disconnection.

Pozicionirni krak 22 termičnega odklopnika 16 pa je namenjen za pozicioniranje termičnega odklopnika 16 v nastavkih 14, 15 spodnjega dela 2 ohišja 1.The positioning arm 22 of the thermal circuit breaker 16 is for positioning the thermal circuit breaker 16 in the nozzles 14, 15 of the lower part 2 of the housing 1.

Termični odklopnik 16 ima tudi na drugem koncu 23 izveden zavihek 24, ki služi za pritrditev na izhodni kontakt 4.The thermal circuit breaker 16 also has a tab 24 at the other end 23 which is used to attach to the output contact 4.

Claims

PATENT APPLICATIONS

1. A miniature overvoltage protection module in an electrical network, which is provided with a housing (1) in which a varistor (13) is inserted, characterized in that it consists of a lower part (2) and an upper part (3) of the housing (1). 1), from which through the grooves (5) at the contact points (6) of the two parts (2, 3) of the housing (1) are output contacts (4).

The miniature module according to claim 1, characterized in that the lower part (2) of the housing (1) at one end (7) has a stepped wall (8) provided with cutouts (9), and the contact surface (10) is provided with holes (11), and having nozzles (12) for positioning the varistor (13) and nozzles (14, 15) for positioning the circuit breaker (16).

The miniature module according to the preceding claims, characterized in that the upper part (3) of the housing (1) at one end (17) has a stepped wall (18) which corresponds to the stepped wall (8) of the lower part (2) of the housing (1), and grooves (19) formed on the stepped wall (18) forming grooves (9) on the stepped wall (8) of the lower part (2) of the housing (1) of the hole (5) for the output of the contacts (4).

The miniature module according to the preceding claims, characterized in that the upper part (3) of the housing (1) has studs (20) arranged around the edges, which can be inserted into the holes (11) on the contact surface (10) of the lower part (2). housing (1), allowing assembly (2, 3) of housing (1) to be assembled.

The miniature module according to the preceding claims, characterized in that the thermal circuit breaker (16) is truncated in length so as to form two arms, one of which is the contact arm (21) and the other is the positioning arm (22), and has thermal breaker (16) at the other end (23) designed tab (24) suitable for attachment to the output contact (4).

The miniature module according to claim 5, characterized in that the contact arm (21) on the thermal circuit breaker (16) is bent taut and soldered to the varistor contact (25) and, due to its shape, is capable of sufficient soldering (26) far from the varistor contact (25).

The miniature module according to claim 5, characterized in that the positioning arm (22) on the thermal circuit breaker (16) is intended for positioning the thermal circuit breaker (16) in the nozzles (14,15) of the lower part (2) of the housing (1).