EP0274980B1 - Gas discharge surge arrester with an ignition line - Google Patents
Gas discharge surge arrester with an ignition line Download PDFInfo
- Publication number
- EP0274980B1 EP0274980B1 EP87730142A EP87730142A EP0274980B1 EP 0274980 B1 EP0274980 B1 EP 0274980B1 EP 87730142 A EP87730142 A EP 87730142A EP 87730142 A EP87730142 A EP 87730142A EP 0274980 B1 EP0274980 B1 EP 0274980B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ignition
- gas discharge
- surge arrester
- discharge surge
- electrodes
- 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
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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
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/08—Overvoltage arresters using spark gaps structurally associated with protected apparatus
-
- 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
- H01T1/20—Means for starting arc or facilitating ignition of spark gap
Definitions
- the invention relates to a gas discharge surge arrester with a housing that is sealed off from the outside, consisting of at least two electrodes and an insulating wall, on the inside of which at least one ignition pad is arranged in the form of an ignition line or an ignition surface, the ignition pad being essentially made of carbon. There are particles that are applied to the inside of the insulating material wall without contact.
- a known gas discharge surge arrester of this type US-A-34 31 452
- the ignition coating or the ignition surface made of metal, metal oxide or carbon particles is applied by contactless spraying onto the inner surface of the insulating body and then subjected to a heat treatment.
- a specific surface conductance of the ignition coating, the ignition line or the ignition surface is not specified.
- a tolerance range for the scatter of this surface conductance is also not determined. Because of this, there is a risk in the known gas discharge surge arrester that the discharge currents flowing over the ignition line are not in a favorable range and that the ignition line may be overloaded, particularly in the case of weak glow discharges.
- the ignition line can evaporate at least partially, as a result of which the response characteristic of the gas discharge surge arrester would change. Therefore, the service life of the known gas discharge surge arrester u. U. may be less than would be possible due to the life of its other components.
- the invention is based on the object of designing the ignition coating so that it can be carried out in a constant quality and with comparatively low tolerances of the surface conductivity.
- the invention provides that the carbon particles have a grain size of at most 10 pm, these particles being applied via a nozzle by means of an arc erosion method known per se. This ensures that the ignition coating is free of impurities and additives in the still unlocked state of the housing, that - in the case of an ignition stroke - its resistance over the entire length has a nominal value in the range from 10 4 to 10 7 ohms, preferably 10 6 ohms and that regardless of the length, the deviation of the resistance value from the nominal value on a logarithmic scale is at most half a power of ten.
- the current flowing through it is defined in a relatively narrow tolerance band for an ignition line.
- a range for the discharge current across the ignition line is delimited, as a result of which the release of electrons caused by field emission from the ignition line is optimized for rapid discharge build-up for a high response speed, particularly in the case of steep overvoltages.
- There are no impurities in the material of the primer that could lead to undefined field strength ratios or contact resistances.
- the resistance value of the ignition stroke can be defined in an optimal range for the function of the gas discharge surge arrester; this enables, in particular, compliance with certain values of the response voltages with only a small spread.
- one or more ignition lines are provided in a number corresponding to the number of electrodes, and that the ignition lines are contacted with the electrodes over their full width. This avoids contact resistance between the electrodes and the ignition line.
- the ignition line is always galvanically connected to one of the electrodes. This safe galvanic coupling significantly reduces the additional spread of the response voltage values.
- the insulating material wall of the gas discharge surge arrester according to the invention is made of glass, this results in a particularly inexpensive manufacture.
- the contactlessly dusted primer with its closely tolerated resistance values also has an advantageous influence on the response behavior of the surge arrester in this case.
- This also applies to gas discharge surge arresters according to the invention, the insulating material walls of which have a surface coated with glass.
- the ignition coating made of carbon particles with a particle size of at most 10 pm
- the ignition coating is optically uniform and has a strikingly dark color, and the layer forming it has the desired low scatter of the resistance values. This creates the prerequisite for ensuring consistent quality even in series production.
- a cylindrical housing part 1 of a gas discharge surge arrester which in the present example forms the insulating material wall and is made of ceramic, has an inner wall 2.
- the electrodes which are not shown and which face each other coaxially, and which form the discharge path of the gas discharge surge arrester, are each pulled over the upper or lower edge of the cylindrical housing part 1 and connected to it in a vacuum-tight manner.
- On the inner wall 2 a non-contact ignition line 3 is shown. However, there are at least two such ignition lines 3, which are applied opposite one another on the inner wall 2.
- the firing lines 3 alternately start from the upper or lower edge of the housing part 1.
- the ignition lines 3 are alternately connected in a conductive manner to the electrodes of the gas discharge surge arrester (not shown) which are attached to the edges of the housing part 1 and are not interrupted.
- the ignition line 3 is not touched by any tools during application and, if necessary, during subsequent consolidation.
- Such an ignition line is produced using an arc erosion process, as is known from DE-A-28 56 581, where it is used for coloring an impactless printing unit.
- Soot particles emerge from the nozzle of an application device. These are generated by erosion from a rod and ejected from the nozzle due to a voltage difference between two electrodes. No cover plates are required for this type of application of the soot particles.
- the total resistance value of the ignition strip 3 can be set to the nominal value of 10 6 ohms regardless of its length and within the desired, comparatively very narrow tolerance band of 0.5 x 10 6 to 5 x Hold 10 6 ohms.
- the current through the ignition line 3 is therefore essentially dependent on the voltage applied and proportional to it.
- the primer 3 is applied without impurities or additives and its full cross section extends to the edge of the housing part 1, so that a complete galvanic connection of its entire cross section to the electrodes can be achieved, a small scatter in the response voltage values can be achieved.
- a long service life of the priming line 3 is also ensured in the event of frequent weak glow discharges, which mainly take place via the priming line 3. This is brought about by the homogeneous structure and purity of the graphite layer, since there are no local increases in resistance or interruptions as a result of partially evaporating additives of the ignition line 3.
Landscapes
- Thermistors And Varistors (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
Die Erfindung bezieht sich auf einen Gasentladungs-Überspannungsableiter mit einem gegenüber dem Außenraum verschlossenen Gehäuse, bestehend aus mindestens zwei Elektroden und einer Isolierstoffwand, auf deren Innenseite mindestens ein Zündbelag in Form eines Zündstriches oder einer Zündfläche angeordnet ist, wobei der Zündbelag im wesentlichen aus Kohlenstoff-Partikeln besteht, die auf die Innenseite der Isolierstoffwand berührungslos aufgebracht sind.The invention relates to a gas discharge surge arrester with a housing that is sealed off from the outside, consisting of at least two electrodes and an insulating wall, on the inside of which at least one ignition pad is arranged in the form of an ignition line or an ignition surface, the ignition pad being essentially made of carbon. There are particles that are applied to the inside of the insulating material wall without contact.
Bei einem bekannten Gasentladungs-Überspannungsableiter dieser Art (US-A-34 31 452) wird der Zündbelag bzw. die Zündfläche aus Metall-, Metalloxid- oder Kohlenstoff-Partikeln durch Aufsprühen berührungslos auf die Innenmantelfläche des Isolierkörpers aufgebracht und anschließend einer Wärmebehandlung unterzogen. Dabei ist bei dem bekannten Gasentladungs-Überspannungsableiter jedoch ein spezifischer Oberflächenleitwert des Zündbelags, des Zündstrichs oder der Zündfläche nicht näher festgelegt. Auch ein Toleranzbereich für die Streuung dieses Oberflächenleitwertes ist nicht bestimmt. Aufgrund dessen besteht bei dem bekannten Gasentladungs-Überspannungsableiter die Gefahr, daß die über den Zündstrich fließenden Entladungsströme sich nicht in einem günstigen Bereich befinden und daß es zu einer Überlastung des Zündstrichs insbesondere bei schwachen Glimmentladungen kommen kann. Dabei kann der Zündstrich zumindest teilweise abdampfen, wodurch sich die Ansprechcharakteristik des Gasentladungs-Überspannungsableiters verändern würde. Deshalb kann auch die Standzeit des bekannten Gasentladungs-Überspannungsableiters u. U. geringer sein als es aufgrund der Lebensdauer seiner übrigen Bauteile möglich wäre.In a known gas discharge surge arrester of this type (US-A-34 31 452), the ignition coating or the ignition surface made of metal, metal oxide or carbon particles is applied by contactless spraying onto the inner surface of the insulating body and then subjected to a heat treatment. In the known gas discharge surge arrester, however, a specific surface conductance of the ignition coating, the ignition line or the ignition surface is not specified. A tolerance range for the scatter of this surface conductance is also not determined. Because of this, there is a risk in the known gas discharge surge arrester that the discharge currents flowing over the ignition line are not in a favorable range and that the ignition line may be overloaded, particularly in the case of weak glow discharges. The ignition line can evaporate at least partially, as a result of which the response characteristic of the gas discharge surge arrester would change. Therefore, the service life of the known gas discharge surge arrester u. U. may be less than would be possible due to the life of its other components.
Ausgehend von einem Gasentladungs-Überspannungsableiter mit den Merkmalen des Oberbegriffes des Patentanspuches 1 liegt der Erfindung die Aufgabe zugrunde, den Zündbelag so auszugestalten, daß er in gleichbleibender Qualität und mit vergleichsweise geringen Toleranzen des Oberflächenleitwertes ausführbar ist.Starting from a gas discharge surge arrester with the features of the preamble of patent claim 1, the invention is based on the object of designing the ignition coating so that it can be carried out in a constant quality and with comparatively low tolerances of the surface conductivity.
Zur Lösung dieser Aufgabe ist gemäß der Erfindung vorgesehen, daß die Kohlenstoffpartikel eine Korngröße von höchstens 10 pm aufweisen, wobei diese Partikel mittels eines an sich bekannten Lichtbogen-Erosionsverfahrens über eine Düse aufgebracht sind. Hierdurch ist gewährleistet, daß der Zündbelag im noch unverschlossenen Zustand des Gehäuses frei von Verunreinigungen und Zuschlagsstoffen ist, daß - im Falle eines Zündstriches - sein Widerstand über die gesamte Länge einen Nennwert im Bereich von 104 bis 107 Ohm, vorzugsweise 106 Ohm hat und daß unabhängig von der Länge die Abweichung des Widerstandswertes vom Nennwert in einem logarithmischen Maßstab höchstens eine halbe Zehnerpotenz beträgt.To achieve this object, the invention provides that the carbon particles have a grain size of at most 10 pm, these particles being applied via a nozzle by means of an arc erosion method known per se. This ensures that the ignition coating is free of impurities and additives in the still unlocked state of the housing, that - in the case of an ignition stroke - its resistance over the entire length has a nominal value in the range from 10 4 to 10 7 ohms, preferably 10 6 ohms and that regardless of the length, the deviation of the resistance value from the nominal value on a logarithmic scale is at most half a power of ten.
Für einen Zündstrich ist dadurch der über ihn fließende Strom in einem relativ engen Toleranzband festgelegt. Örtliche Überhitzungen und damit einhergehende Zerstörungen des Zündstrichs durch Abdampfen von Verunreinigungen und Zuschlagstoffen, wodurch die Standzeit des gesamten Gasentladungs-Überspannungsableiters reduziert werden würde, sind sicher vermieden. Außerdem ist ein Bereich für den Entladungsstrom über den Zündstrich eingegrenzt, wodurch die durch Feldemission aus dem Zündstrich bewirkte Auslösung von Elektronen zum schnellen Entladungsaufbau für eine hohe Ansprechschnelligkeit insbesondere bei steilen Überspannungen optimiert ist. Verunreinigungen im Material des Zündstrichs, die zu undefinierten Feldstärkeverhältnissen oder Übergangswiderständen führen könnten, liegen nicht vor. Insgesamt läßt sich der Widerstandswert des Zündstrichs in einem für die Funktion des Gasentladungs-Überspannungsableiters optimalen Bereich festlegen; dies ermöglicht insbesondere die Einhaltung bestimmter Werte der Ansprechspannungen mit nur geringer Streuung.As a result, the current flowing through it is defined in a relatively narrow tolerance band for an ignition line. Local overheating and the associated destruction of the ignition line by evaporation of impurities and additives, which would reduce the service life of the entire gas discharge surge arrester, are certainly avoided. In addition, a range for the discharge current across the ignition line is delimited, as a result of which the release of electrons caused by field emission from the ignition line is optimized for rapid discharge build-up for a high response speed, particularly in the case of steep overvoltages. There are no impurities in the material of the primer that could lead to undefined field strength ratios or contact resistances. Overall, the resistance value of the ignition stroke can be defined in an optimal range for the function of the gas discharge surge arrester; this enables, in particular, compliance with certain values of the response voltages with only a small spread.
Es kann vorteilhaft sein, daß Zündstriche in einer der Elektrodenzahl entsprechenden Anzahl ein- oder mehrfach vorgesehen sind, und daß die Zündstriche über ihre volle Breite mit den Elektroden kontaktiert sind. Damit sind Übergangswiderstände zwischen den Elektroden und dem Zündstrich vermieden. Außerdem ist der Zündstrich ständig galvanisch mit jeweils einer der Elektroden verbunden. Durch diese sichere galvanische Kopplung ist eine zusätzliche Streuung der Ansprechspannungswerte deutlich verringert.It may be advantageous that one or more ignition lines are provided in a number corresponding to the number of electrodes, and that the ignition lines are contacted with the electrodes over their full width. This avoids contact resistance between the electrodes and the ignition line. In addition, the ignition line is always galvanically connected to one of the electrodes. This safe galvanic coupling significantly reduces the additional spread of the response voltage values.
Wenn die Isoliersstoffwand des erfindungsgemäßen GasentladungsÜberspannungsableiters aus Glas besteht, ergibt sich eine besonders preisgünstige Fertigung. Der berührungslos aufgestäubte Zündstrich mit seinen eng tolerierten Widerstandswerten hat auch in diesem Fall einen vorteilhaften Einfluß auf das Ansprechverhalten des Überspannungsableiters. Dies gilt ebenso für erfindungsgemäße Gasentladungs-Überspannungsableiter, deren Isolierstoffwände eine mit Glas beschichtete Oberfläche haben.If the insulating material wall of the gas discharge surge arrester according to the invention is made of glass, this results in a particularly inexpensive manufacture. The contactlessly dusted primer with its closely tolerated resistance values also has an advantageous influence on the response behavior of the surge arrester in this case. This also applies to gas discharge surge arresters according to the invention, the insulating material walls of which have a surface coated with glass.
Infolge der Zusammensetzung des Zündbelages aus Kohlenstoff-Partikeln mit einer Teilchengröße von höchstens 10pm ist der Zündbelag von optisch gleichmäßiger Beschaffenheit sowie auffallend dunkler Farbe, und die ihn bildende Schicht hat die gewünschte geringe Streuung der Widerstandswerte. Dies schafft die Voraussetzung, auch in einer Serienfertigung eine gleichbleibende Qualität zu gewährleisten.As a result of the composition of the ignition coating made of carbon particles with a particle size of at most 10 pm, the ignition coating is optically uniform and has a strikingly dark color, and the layer forming it has the desired low scatter of the resistance values. This creates the prerequisite for ensuring consistent quality even in series production.
Anhand der Zeichnung wird ein Ausführungsbeispiel eines erfindungsgemäßen Gasentladungs-Überspannungsableiter beschrieben und seine Funktion näher erläutert.
- Figur 1 zeigt ein zylinderförmiges Gehäuseteil des Gasentladungs-Überspannungsableiters in axialer Blickrichtung.
- Figur 2 zeigt dasselbe Gehäuseteil im Schnitt.
- Figure 1 shows a cylindrical housing part of the gas discharge surge arrester in the axial direction of view.
- Figure 2 shows the same housing part in section.
Ein zylindrisches Gehäuseteil 1 eines Gasentladungs-Überspannungsableiters, welches im vorliegenden Beispiel die Isolierstoffwand bildet und aus Keramik besteht, weist eine Innenwand 2 auf. Die nicht dargestellten, einander koaxial gegenüberstehenden Elektroden, welche die Entladungsstrecke des Gasentladungs-Überspannungsableiters bilden, sind jeweils über den oberen bzw. unteren Rand des zylindrischen Gehäuseteils 1 herumgezogen und mit diesem vakuumdicht verbunden. Auf die Innenwand 2 ist ein berührungslos aufgebrachter Zündstrich 3 dargestellt. Es sind jedoch zumindest zwei derartige Zündstriche 3 vorhanden, die gegenüberliegend auf der Innenwand 2 aufgebracht sind. Dabei gehen die Zündstriche 3 jeweils abwechselnd vom oberen bzw. unteren Rand des Gehäuseteils 1 aus. Dadurch sind die Zündstriche 3 auch abwechselnd mit den an den Rändern des Gehäuseteils 1 angebrachten, nicht dargestellten Elektroden des Gasentladungs-Überspannungsableiters gleichmäßig und unterbrechungsfrei leitend verbunden.A cylindrical housing part 1 of a gas discharge surge arrester, which in the present example forms the insulating material wall and is made of ceramic, has an inner wall 2. The electrodes, which are not shown and which face each other coaxially, and which form the discharge path of the gas discharge surge arrester, are each pulled over the upper or lower edge of the cylindrical housing part 1 and connected to it in a vacuum-tight manner. On the inner wall 2, a non-contact ignition line 3 is shown. However, there are at least two such ignition lines 3, which are applied opposite one another on the inner wall 2. The firing lines 3 alternately start from the upper or lower edge of the housing part 1. As a result, the ignition lines 3 are alternately connected in a conductive manner to the electrodes of the gas discharge surge arrester (not shown) which are attached to the edges of the housing part 1 and are not interrupted.
Der Zündstrich 3 wird beim Auftragen und ggf. bei einer nachträglichen Verfestigung durch keinerlei Werkzeuge berührt. Die Herstellung eines derartigen Zündstriches erfolgt mit einem Lichtbogen-Erosionsverfahren, wie es aus der DE-A-28 56 581 bekannt ist und dort zur Farbgebung für ein Schlaglosdruckwerk eingesetzt wird. Hierbei treten aus der Düse einer Auftragvorrichtung Rußpartikel aus. Diese werden durch Erosion aus einem Stab erzeugt und infolge eines Spannungsunterschiedes zwischen zwei Elektroden aus der Düse ausgestoßen. Für diese Art des Aufbringens der Rußpartikel werden keine Abdeckblenden benötigt.The ignition line 3 is not touched by any tools during application and, if necessary, during subsequent consolidation. Such an ignition line is produced using an arc erosion process, as is known from DE-A-28 56 581, where it is used for coloring an impactless printing unit. Soot particles emerge from the nozzle of an application device. These are generated by erosion from a rod and ejected from the nozzle due to a voltage difference between two electrodes. No cover plates are required for this type of application of the soot particles.
Durch die einfache Variation der Dichte der Graphitschicht bei dem genannten Verfahren läßt sich der Gesamtwiderstandswert des Zündstrichs 3 unabhängig von dessen Länge auf den Nennwert von 106 Ohm einstellen und in dem angestrebten, vergleichsweise sehr engen Toleranzband von 0,5 x 106 bis 5 x 106 Ohm halten. Damit ist der Strom über den Zündstrich 3 im wesentlichen abhängig von der angelegten Spannung und zu ihr proportional. Da außerdem der Zündstrich 3 ohne Verunreinigungen oder Zuschlagsstoffe aufgebracht ist und sein voller Querschnitt bis an den Rand des Gehäuseteils 1 reicht, so daß eine vollständige galvanische Verbindung seines ganzen Querschnitts zu den Elektroden hergestellt werden kann, ist eine geringe Streuung der Ansprechspannungswerte erzielbar. Zugleich ist darüberhinaus eine hohe Lebensdauer des Zündstrichs 3 auch für den Fall häufiger schwacher Glimmentladungen, die hauptsächlich über den Zündstrich 3 erfolgen, gewährleistet. Dies ist durch die homogene Struktur und Reinheit der Graphitschicht bewirkt, da hierbei keine örtlichen Widerstandserhöhungen oder Unterbrechungen infolge partiell abdampfender Zuschlagstoffe des Zündstrichs 3 auftreten.By simply varying the density of the graphite layer in the above-mentioned method, the total resistance value of the ignition strip 3 can be set to the nominal value of 10 6 ohms regardless of its length and within the desired, comparatively very narrow tolerance band of 0.5 x 10 6 to 5 x Hold 10 6 ohms. The current through the ignition line 3 is therefore essentially dependent on the voltage applied and proportional to it. In addition, since the primer 3 is applied without impurities or additives and its full cross section extends to the edge of the housing part 1, so that a complete galvanic connection of its entire cross section to the electrodes can be achieved, a small scatter in the response voltage values can be achieved. At the same time, a long service life of the priming line 3 is also ensured in the event of frequent weak glow discharges, which mainly take place via the priming line 3. This is brought about by the homogeneous structure and purity of the graphite layer, since there are no local increases in resistance or interruptions as a result of partially evaporating additives of the ignition line 3.
Claims (2)
characterized in that the ignition strips (3) are provided singly or in multiples in a number corresponding to the number of electrodes, and in that the ignition strips (3) are contacted along their full width to the electrodes.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000554090A CA1312913C (en) | 1986-12-15 | 1987-12-11 | Gas discharge over-voltage arrestor having a line of ignition |
| KR870014403A KR880008482A (en) | 1986-12-15 | 1987-12-14 | Gas Discharge Overvoltage Arrester with Ignition Wire |
| AU82495/87A AU589823B2 (en) | 1986-12-15 | 1987-12-14 | Gas discharge over-voltage arrestor having a line of ignition |
| US07/132,201 US4891731A (en) | 1986-12-15 | 1987-12-14 | Gas discharge over-voltage arrestor having a line of ignition |
| JP62317253A JPS63174291A (en) | 1986-12-15 | 1987-12-14 | Gas discharge arrestor |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3642818 | 1986-12-15 | ||
| DE19863642818 DE3642818A1 (en) | 1986-12-15 | 1986-12-15 | GAS DISCHARGE OVERVOLTAGE ARRESTER WITH FLASH |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0274980A2 EP0274980A2 (en) | 1988-07-20 |
| EP0274980A3 EP0274980A3 (en) | 1988-07-27 |
| EP0274980B1 true EP0274980B1 (en) | 1991-05-08 |
Family
ID=6316227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87730142A Expired - Lifetime EP0274980B1 (en) | 1986-12-15 | 1987-11-12 | Gas discharge surge arrester with an ignition line |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0274980B1 (en) |
| KR (1) | KR880008482A (en) |
| DE (2) | DE3642818A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4318994A1 (en) * | 1993-05-26 | 1994-12-08 | Siemens Ag | Gas-filled surge arrester |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003021735A1 (en) | 2001-09-02 | 2003-03-13 | Phoenix Contact Gmbh & Co. Kg | Overload protection device |
| DE10146728B4 (en) * | 2001-09-02 | 2007-01-04 | Phoenix Contact Gmbh & Co. Kg | Overvoltage protection device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3431452A (en) * | 1967-05-17 | 1969-03-04 | Us Air Force | High-power surge arrester |
| DE2032899C2 (en) * | 1970-07-02 | 1983-07-14 | Joslyn Mfg. and Supply Co., 60606 Chicago, Ill. | Protective spark gap with cup shaped electrodes - has graphite line inside insulated holding tube, in contact with respective electrodes |
| BE789890A (en) * | 1971-10-12 | 1973-02-01 | Western Electric Co | PROTECTION AGAINST OVERVOLTAGES, WITH A DISCHARGE TUBE, AND ITS EMBODIMENT PROCESS |
| GB2153138A (en) * | 1984-01-19 | 1985-08-14 | Beswick Kenneth E Ltd | Surge voltage arrestors |
-
1986
- 1986-12-15 DE DE19863642818 patent/DE3642818A1/en not_active Withdrawn
-
1987
- 1987-11-12 DE DE8787730142T patent/DE3769960D1/en not_active Expired - Fee Related
- 1987-11-12 EP EP87730142A patent/EP0274980B1/en not_active Expired - Lifetime
- 1987-12-14 KR KR870014403A patent/KR880008482A/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4318994A1 (en) * | 1993-05-26 | 1994-12-08 | Siemens Ag | Gas-filled surge arrester |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3642818A1 (en) | 1988-06-16 |
| EP0274980A2 (en) | 1988-07-20 |
| KR880008482A (en) | 1988-06-28 |
| DE3769960D1 (en) | 1991-06-13 |
| EP0274980A3 (en) | 1988-07-27 |
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