EP0312729B1 - Heat-sensitive protection device for a surge arrester incorporated in surge protector assemblies for telephone lines - Google Patents

Heat-sensitive protection device for a surge arrester incorporated in surge protector assemblies for telephone lines Download PDF

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Publication number
EP0312729B1
EP0312729B1 EP88113259A EP88113259A EP0312729B1 EP 0312729 B1 EP0312729 B1 EP 0312729B1 EP 88113259 A EP88113259 A EP 88113259A EP 88113259 A EP88113259 A EP 88113259A EP 0312729 B1 EP0312729 B1 EP 0312729B1
Authority
EP
European Patent Office
Prior art keywords
surge arrester
surge
spring
protection device
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88113259A
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German (de)
French (fr)
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EP0312729A1 (en
Inventor
Lutz Biederstedt
Manfred Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ADC GmbH
Original Assignee
Krone GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Krone GmbH filed Critical Krone GmbH
Priority to AT88113259T priority Critical patent/ATE69126T1/en
Publication of EP0312729A1 publication Critical patent/EP0312729A1/en
Application granted granted Critical
Publication of EP0312729B1 publication Critical patent/EP0312729B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T1/00—Details of spark gaps
    • H01T1/14—Means structurally associated with spark gap for protecting it against overload or for disconnecting it in case of failure

Definitions

  • the invention relates to a surge arrester magazine according to the preamble of claim 1.
  • a surge arrester magazine of this type is previously known from DE-A-27 38 078.
  • the melting element of the thermal protection device is designed as a sleeve surrounding the overvoltage conductor, which is pierced by the spring arms of the bow spring in the event of an overvoltage.
  • the disadvantage here is that the melting element forms an additional component, which must also be adapted precisely to the shape of the surge arrester. Furthermore, leakage currents can flow between the spring arms of the bow spring and the contacts of the surge arrester.
  • a non-generic thermal protection device wherein which of the surge arrester is not inserted into a chamber of a housing body.
  • cup-shaped melting elements are arranged here for receiving compression springs, which connect two yoke-like contact plates to one another.
  • the base parts of the cup-shaped melting elements melt, as a result of which the springs connect the yoke-like contact plates to one another.
  • the disadvantage here is that the cup-shaped melting elements form additional components.
  • the invention is therefore based on the object of providing a surge arrester magazine of the generic type in which only as few and simple components as possible are required and leakage currents between the bow spring and the contacts of the surge arrester are avoided.
  • the Schelzelement is formed from a partition between the two chambers for receiving the surge arrester and the bow spring made of thermoplastic material, which forms a simple and, above all, easy to replace component. Due to the arrangement of the bow spring in the separate chamber, there is also sufficient electrical separation between the bow spring and the contacts of the surge arrester, so that no leakage currents can occur. The surge arrester can also be used again after a surge.
  • the one-piece design of the partition with the housing body creates a possibility of inserting or removing the surge arrester in the surge arrester magazine independently of the bow spring. This significantly reduces the loading time of the surge arrester magazines.
  • the surge arrester magazine 11 consists of a housing body 13 made of thermoplastic material and a metallic earth rail 12.
  • one or more chambers 14, which are open at the top, are provided for receiving surge arresters 6, which are preferably arranged next to one another in a row.
  • the chambers 14 are assigned to chambers 9 for receiving bow springs 3.
  • the inner contour of the chamber 14 is adapted to the cylindrical surge arrester 6, which has contacts 7, 8 on both end faces.
  • the cylindrical chamber 14 is closed at the bottom by the earth rail 12 extending over the entire bottom surface of the housing body 13, so that the contact 7 of the surge arrester 6 inserted into the chamber 14 is electrically connected to the earth rail 12.
  • a contact spring 15 connected to a telecommunication cable bears against the other contact 8 of the surge arrester 6. The contact spring 15 resiliently presses the surge arrester 6 against the earth rail 12, which is thus held clamped in the chamber 14.
  • a further rectangular, upwardly open chamber 9 is provided which, in contrast to chamber 14, is closed on the bottom and thus has no connection to earth rail 12. Both chambers 9, 14 are separated from one another by a thin partition 1 made of a thermoplastic plastic of the housing body 13.
  • a U-shaped bow spring 3 with two spring arms 4, 5 is inserted into the chamber 9, which is open at the top, in such a way that the spring arms 4, 5 point in the direction of the partition wall 2.
  • the ends of the spring arms 4, 5 are now assigned to the contacts 7, 8 of the surge arrester 6 and are only separated from one another by the partition 2.
  • the bow spring 3 is slightly biased so that the two spring arms 4, 5 of the bow spring 3 are pressed at right angles against the partition 1.
  • the overcurrent flows via the contact spring 15 to the contact 8 of the surge arrester 6.
  • the contact spring 15 There is a gas spark gap between the one contact 8 and the other contact 7 of the surge arrester, so that an arc arises between the contacts 7, 8 of the surge arrester 6. Since the contact 7 rests directly on the earth rail 12, the resulting overcurrent is dissipated to earth.
  • a further chamber 9 with the U-shaped bow spring 3 is provided next to each chamber 14 receiving a surge arrester 6. Due to the heating of the surge arrester 6 at high temperatures, the dividing wall 1 delimiting the two chambers 9, 14 becomes plastic, so that the spring arms 4,5 of the bow spring 3 pressing against the dividing wall 1 under a spring force penetrate the dividing wall 1. An electrical connection between the bow spring 3 and the surge arrester 6 is thus established since the spring arm 4 meets the contact 8 and the spring arm 5 of the bow spring 3 meets the contact 7 of the surge arrester 6. The arc formed in the gas spark gap of the surge arrester 6 is thus short-circuited by the bow spring 3, as a result of which the overcurrent can flow off directly to the earth potential.
  • the partition 1 has a minimum thickness of approximately 0.3 mm.
  • the partition is designed as an individual part which can be inserted between the two chambers 9, 14.

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  • Fuses (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Thermistors And Varistors (AREA)
  • Protection Of Static Devices (AREA)

Description

Die Erfindung bezieht sich auf ein Überspannungsableitermagazin gemäß dem Oberbegriff des Anspruches 1.The invention relates to a surge arrester magazine according to the preamble of claim 1.

Ein Überspannungsableitermagazin dieser Art ist aus der DE-A-27 38 078 vorbekannt. Hierbei ist das Schmelzelement der Thermoschutzvorrichtung als eine den Überspannungsleiter umgebende Hülse ausgebildet, die im Überspannungsfall von den Federarmen der Bügelfeder durchstoßen wird. Nachteilig hierbei ist, daß das Schmelzelement ein zusätzliches Bauteil bildet, das außerdem an die Form des Überspannungsableiters genau angepaßt werden muß. Ferner können Kriechströme zwischen den Federarmen der Bügelfeder und den Kontakten des Überspannungsableiters fließen.A surge arrester magazine of this type is previously known from DE-A-27 38 078. Here, the melting element of the thermal protection device is designed as a sleeve surrounding the overvoltage conductor, which is pierced by the spring arms of the bow spring in the event of an overvoltage. The disadvantage here is that the melting element forms an additional component, which must also be adapted precisely to the shape of the surge arrester. Furthermore, leakage currents can flow between the spring arms of the bow spring and the contacts of the surge arrester.

Es ist ferner aus der EP-A-0.040.522 eine gattungsfremde Thermoschutzvorrichtung bekannt, wobei welcher der Überspannungsableiter nicht in eine Kammer eines Gehäusekörpers eingesetzt ist. Statt dessen sind hier napfförmige Schmelzelemente zur Aufnahme von Druckfedern angeordnet, welche zwei jochartige Kontaktplatten miteinander verbinden. Im Überspannungsfall schmelzen die Bodenteile der napfförmigen Schmelzelemente, wodurch die Federn die jochartigen Kontaktplatten miteinander verbinden. Nachteilig hierbei ist, daß die napfförmigen Schmelzelemente zusätzliche Bauteile bilden.From EP-A-0.040.522 a non-generic thermal protection device is also known, wherein which of the surge arrester is not inserted into a chamber of a housing body. Instead, cup-shaped melting elements are arranged here for receiving compression springs, which connect two yoke-like contact plates to one another. In the event of an overvoltage, the base parts of the cup-shaped melting elements melt, as a result of which the springs connect the yoke-like contact plates to one another. The disadvantage here is that the cup-shaped melting elements form additional components.

Es ist ferner aus dem Prospekt "Surge Arresters" der The M-O Valve Company Ltd. eine Thermoschutzvorrichtung für Überspannungsableiter bekannt, die mit einem festverbundenen Federstab versehen sind, der durch eine Kunststoffummantelung auf Abstand zum Überspannungsableiter gehalten ist. Im Überspannungsfall schmilzt die Kunststoffummantelung, wodurch der Federstab über die Kontakte der Überspannungsableiter kurzschließt. Nachteilig ist, daß der Federstab ein fest mit dem Überspannungsableiter verbundenes Sonderbauteil bildet und daß der Überspannungsableiter nach dem Wegschmelzen der Kunststoffummantelung nicht mehr verwendbar ist.It is also from the "Surge Arresters" prospectus of The M-O Valve Company Ltd. a thermal protection device for surge arresters are known, which are provided with a fixed spring rod which is held at a distance from the surge arrester by a plastic sheath. In the event of an overvoltage, the plastic coating melts, causing the spring rod to short-circuit via the contacts of the surge arrester. It is disadvantageous that the spring rod forms a special component firmly connected to the surge arrester and that the surge arrester can no longer be used after the plastic sheathing has melted away.

Der Erfindung liegt von daher die Aufgabe zugrunde, ein Überspannungsableitermagazin der gattungsgemäßen Art zu schaffen, bei dem nur möglichst wenige und einfache Bauteile erforderlich und Kriechströme zwischen der Bügelfeder und den Kontakten des Überspannungsableiters vermieden sind.The invention is therefore based on the object of providing a surge arrester magazine of the generic type in which only as few and simple components as possible are required and leakage currents between the bow spring and the contacts of the surge arrester are avoided.

Die Lösung dieser Aufgabe ergibt sich aus den kennzeichnenden Merkmalen des Anspruches 1. Erfindungsgemäß wird das Schelzelement aus einer zwischen den beiden Kammern zur Aufnahme des Überspannungsableiters und der Bügelfeder angeordneten Trennwand aus thermoplastischem Kunststoff gebildet, welche ein einfaches und vor allem einfach zu ersetzendes Bauteil bildet. Durch die Anordnung der Bügelfeder in der separaten Kammer besteht darüberhinaus zwischen der Bügelfeder und den Kontakten des Überspannungsableiters eine ausreichende elektrische Trennung, sodaß keine Kriechströme entstehen können. Auch ist der Überspannungsableiter nach einem Überspannungsfall wieder verwendbar.The solution to this problem results from the characterizing features of claim 1. According to the invention, the Schelzelement is formed from a partition between the two chambers for receiving the surge arrester and the bow spring made of thermoplastic material, which forms a simple and, above all, easy to replace component. Due to the arrangement of the bow spring in the separate chamber, there is also sufficient electrical separation between the bow spring and the contacts of the surge arrester, so that no leakage currents can occur. The surge arrester can also be used again after a surge.

Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen. So wird durch die einteilige Ausbildung der Trennwand mit dem Gehäusekörper eine Möglichkeit geschaffen, den Überspannungsableiter unabhängig von der Bügelfeder in das Überspannungsableitermagazin einzusetzen bzw. aus diesem herauszunehmen. Hierdurch wird die Bestückungszeit der Überspannungsableitermagazine wesentlich verringert.Further advantageous embodiments of the invention result from the subclaims. The one-piece design of the partition with the housing body creates a possibility of inserting or removing the surge arrester in the surge arrester magazine independently of the bow spring. This significantly reduces the loading time of the surge arrester magazines.

Die Erfindung ist nachfolgend anhand eines in den Zeichnungen dargestellten Ausführungsbeispieles eines Überspannungsableitermagazins näher erläutert. Es zeigen:

Fig. 1
Eine perspektivische Darstellung des Überspannungsableitermagazines mit Thermoschutzvorrichtung und
Fig. 2
eine Schnittdarstellung gemäß der Linie I-I in Fig. 1
The invention is explained in more detail below on the basis of an exemplary embodiment of a surge arrester magazine shown in the drawings. Show it:
Fig. 1
A perspective view of the surge arrester magazine with thermal protection device and
Fig. 2
2 shows a sectional view along line II in FIG. 1

Das Überspannungsableitermagazin 11 besteht aus einem Gehäusekörper 13 aus thermoplastischem Kunststoff und einer metallischen Erdschiene 12. Im Gehäusekörper 13 sind eine oder mehrere, nach oben offene Kammern 14 zur Aufnahme von Überspannungsableitern 6 vorgesehen, die vorzugsweise nebeneinander in einer Reihe angeordnet sind. Den Kammern 14 sind Kammern 9 zur Aufnahme von Bügelfedern 3 zugeordnet. Wie in den Figuren 1 und 2 dargestellt, ist die innere Kontur der Kammer 14 dem zylinderförmigen Überspannungsableiter 6 angepaßt, der auf beiden Stirnseiten Kontakte 7,8 besitzt.The surge arrester magazine 11 consists of a housing body 13 made of thermoplastic material and a metallic earth rail 12. In the housing body 13, one or more chambers 14, which are open at the top, are provided for receiving surge arresters 6, which are preferably arranged next to one another in a row. The chambers 14 are assigned to chambers 9 for receiving bow springs 3. As shown in Figures 1 and 2, the inner contour of the chamber 14 is adapted to the cylindrical surge arrester 6, which has contacts 7, 8 on both end faces.

Die zylinderförmige Kammer 14 ist bodenseitig durch die sich über die ganze Bodenfläche des Gehäusekörpers 13 erstreckende Erdschiene 12 verschlossen, so daß der Kontakt 7 des in die Kammer 14 eingesetzten Überspannungsableiters 6 mit der Erdschiene 12 elektrisch verbunden ist. An der Oberseite 16 des Gehäusekörpers 13 liegt am anderen Kontakt 8 des Überspannungsableiters 6 eine mit einem Fernmeldekabel verbundene Kontaktfeder 15 an. Die Kontaktfeder 15 drückt federnd den Überspannungsableiter 6 gegen die Erdschiene 12, der somit in der Kammer 14 klemmend gehalten ist.The cylindrical chamber 14 is closed at the bottom by the earth rail 12 extending over the entire bottom surface of the housing body 13, so that the contact 7 of the surge arrester 6 inserted into the chamber 14 is electrically connected to the earth rail 12. On the top 16 of the housing body 13, a contact spring 15 connected to a telecommunication cable bears against the other contact 8 of the surge arrester 6. The contact spring 15 resiliently presses the surge arrester 6 against the earth rail 12, which is thus held clamped in the chamber 14.

Neben jeder Kammer 14 ist eine weitere, rechteckförmige, nach oben offene Kammer 9 vorgesehen, die im Gegensatz zur Kammer 14 bodenseitig verschlossen ist und somit keine Verbindung zur Erdschiene 12 besitzt. Beide Kammern 9,14 sind durch eine dünne Trennwand 1 aus einem thermoplastischen Kunststoff des Gehäusekörpers 13 voneinander getrennt.In addition to each chamber 14, a further rectangular, upwardly open chamber 9 is provided which, in contrast to chamber 14, is closed on the bottom and thus has no connection to earth rail 12. Both chambers 9, 14 are separated from one another by a thin partition 1 made of a thermoplastic plastic of the housing body 13.

In die nach oben offene Kammer 9 ist eine U-förmig ausgebildete Bügelfeder 3 mit zwei Federarmen 4,5 eingesteckt, und zwar so, daß die Federarme 4,5 in Richtung Trennwand 2 zeigen. Die Enden der Federarme 4,5 sind jetzt den Kontakten 7,8 des Überspannungsableiters 6 zugeordnet und nur durch die Trennwand 2 voneinander getrennt. Die Bügelfeder 3 ist leicht vorgespannt, so daß die beiden Federarme 4,5 der Bügelfeder 3 rechtwinklig federnd gegen die Trennwand 1 gedrückt sind.A U-shaped bow spring 3 with two spring arms 4, 5 is inserted into the chamber 9, which is open at the top, in such a way that the spring arms 4, 5 point in the direction of the partition wall 2. The ends of the spring arms 4, 5 are now assigned to the contacts 7, 8 of the surge arrester 6 and are only separated from one another by the partition 2. The bow spring 3 is slightly biased so that the two spring arms 4, 5 of the bow spring 3 are pressed at right angles against the partition 1.

Beim Auftreten einer Überspannung fließt der Überstrom über die Kontaktfeder 15 zum Kontakt 8 des Überspannungsableiters 6. Zwischen dem einen Kontakt 8 und dem anderen Kontakt 7 des Überspannungsableiters besteht eine Gasfunkenstrecke, so daß zwischen den Kontakten 7,8 des Überspannungsableiters 6 ein Lichtbogen entsteht. Da der Kontakt 7 direkt an der Erdschiene 12 aufliegt, wird der entstandene Überstrom auf Erde abgeleitet.When an overvoltage occurs, the overcurrent flows via the contact spring 15 to the contact 8 of the surge arrester 6. There is a gas spark gap between the one contact 8 and the other contact 7 of the surge arrester, so that an arc arises between the contacts 7, 8 of the surge arrester 6. Since the contact 7 rests directly on the earth rail 12, the resulting overcurrent is dissipated to earth.

Fließt der Überstrom auf eine längere Zeit, so würde das Überspannungsableitermagazin 11 aufgrund der hohen Temperatur zerstört werden. Um diese Zerstörung zu verhindern, ist neben jeder, einen Überspannungsableiter 6 aufnehmenden Kammer 14 eine weitere Kammer 9 mit der U-förmigen Bügelfeder 3 vorgesehen. Durch die Erwärmung des Überspannungsableiters 6 bei hohen Temperaturen wird die die beiden Kammern 9,14 begrenzende Trennwand 1 plastisch, so daß die unter einer Federkraft gegen die Trennwand 1 andrückenden Federarme 4,5 der Bügelfeder 3 die Trennwand 1 durchstoßen. Eine elektrische Verbindung zwischen Bügelfeder 3 und dem Überspannungsableiter 6 ist somit hergestellt, da der Federarm 4 auf den Kontakt 8 und der Federarm 5 der Bügelfeder 3 auf den Kontakt 7 des Überspannungsableiters 6 treffen. Der in der Gasfunkenstrecke des Überspannungsableiters 6 gebildete Lichtbogen wird somit durch die Bügelfeder 3 kurzgeschlossen, wodurch der Überstrom direkt auf das Erdpotential abfließen kann. Die Trennwand 1 hat Mindestdicke von ca. 0,3 mm.If the overcurrent flows for a longer period of time, the surge arrester magazine 11 would be destroyed due to the high temperature. In order to prevent this destruction, a further chamber 9 with the U-shaped bow spring 3 is provided next to each chamber 14 receiving a surge arrester 6. Due to the heating of the surge arrester 6 at high temperatures, the dividing wall 1 delimiting the two chambers 9, 14 becomes plastic, so that the spring arms 4,5 of the bow spring 3 pressing against the dividing wall 1 under a spring force penetrate the dividing wall 1. An electrical connection between the bow spring 3 and the surge arrester 6 is thus established since the spring arm 4 meets the contact 8 and the spring arm 5 of the bow spring 3 meets the contact 7 of the surge arrester 6. The arc formed in the gas spark gap of the surge arrester 6 is thus short-circuited by the bow spring 3, as a result of which the overcurrent can flow off directly to the earth potential. The partition 1 has a minimum thickness of approximately 0.3 mm.

In einer nicht dargestellten Ausführungsform ist die Trennwand als zwischen die beiden Kammern 9,14 einlegbares Einzelteil ausgebildet.In an embodiment not shown, the partition is designed as an individual part which can be inserted between the two chambers 9, 14.

Claims (3)

  1. A surge protector assembly for telephone lines with a heat-sensitive protection device for the incorporated surge arrester, wherein a bracket spring and a melt element is assigned to the surge arrester inserted into a chamber of the housing body of the assembly, said melt element being pierced, in case of an over-voltage, by at least one spring arm for short-circuiting the two contacts of the surge arrester, characterized by that to the chamber (14) for the surge arrester (6), a separate chamber (9) formed in the housing body (13) is assigned for receiving the bracket spring (3), and that between the two chambers (9, 14), a separating wall (1) of thermoplastic material is provided as a melt element (2).
  2. A surge protector assembly according to claim 1, characterized by that the separating wall (1) has a wall thickness of approx. 0.3 mm.
  3. A surge protector assembly according to claims 1 or 2, characterized by that the separating wall (1) is formed as one piece with the housing body (13) of the surge protector assembly (1).
EP88113259A 1987-10-20 1988-08-13 Heat-sensitive protection device for a surge arrester incorporated in surge protector assemblies for telephone lines Expired - Lifetime EP0312729B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88113259T ATE69126T1 (en) 1987-10-20 1988-08-13 THERMAL PROTECTION DEVICE FOR OVERVOLTAGE ARRESTERS INCORPORATED IN OVERVOLTAGE ARRESTER MAGAZINES OF TELECOMMUNICATION TECHNOLOGY.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3735837 1987-10-20
DE3735837 1987-10-20
DE3820272 1988-06-10
DE3820272A DE3820272C1 (en) 1987-10-20 1988-06-10

Publications (2)

Publication Number Publication Date
EP0312729A1 EP0312729A1 (en) 1989-04-26
EP0312729B1 true EP0312729B1 (en) 1991-10-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP88113259A Expired - Lifetime EP0312729B1 (en) 1987-10-20 1988-08-13 Heat-sensitive protection device for a surge arrester incorporated in surge protector assemblies for telephone lines

Country Status (17)

Country Link
US (1) US4887183A (en)
EP (1) EP0312729B1 (en)
JP (1) JPH01109626A (en)
CN (1) CN1012867B (en)
AR (1) AR241296A1 (en)
AT (1) ATE69126T1 (en)
AU (1) AU606223B2 (en)
BR (1) BR8805396A (en)
CA (1) CA1330826C (en)
DE (2) DE3820272C1 (en)
ES (1) ES2026980T3 (en)
GR (1) GR3003039T3 (en)
HK (1) HK84092A (en)
IN (1) IN169696B (en)
MX (1) MX164630B (en)
RU (1) RU2024136C1 (en)
YU (1) YU47295B (en)

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Publication number Publication date
US4887183A (en) 1989-12-12
EP0312729A1 (en) 1989-04-26
YU195888A (en) 1991-06-30
IN169696B (en) 1991-12-07
YU47295B (en) 1995-01-31
JPH01109626A (en) 1989-04-26
AU2409788A (en) 1989-04-20
RU2024136C1 (en) 1994-11-30
CN1012867B (en) 1991-06-12
HK84092A (en) 1992-11-06
AU606223B2 (en) 1991-01-31
JPH0576125B2 (en) 1993-10-22
GR3003039T3 (en) 1993-02-17
AR241296A1 (en) 1992-04-30
DE3865943D1 (en) 1991-12-05
ES2026980T3 (en) 1992-05-16
MX164630B (en) 1992-09-10
BR8805396A (en) 1989-06-20
ATE69126T1 (en) 1991-11-15
CN1032716A (en) 1989-05-03
CA1330826C (en) 1994-07-19
DE3820272C1 (en) 1989-04-06

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