EP0927445B1 - Elektrischer apparat, insbesondere überspannungsableiter, und system zur anzeige des zustands dieses apparats in einer zentralen auswertevorrichtung - Google Patents
Elektrischer apparat, insbesondere überspannungsableiter, und system zur anzeige des zustands dieses apparats in einer zentralen auswertevorrichtung Download PDFInfo
- Publication number
- EP0927445B1 EP0927445B1 EP97934404A EP97934404A EP0927445B1 EP 0927445 B1 EP0927445 B1 EP 0927445B1 EP 97934404 A EP97934404 A EP 97934404A EP 97934404 A EP97934404 A EP 97934404A EP 0927445 B1 EP0927445 B1 EP 0927445B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- optical fibre
- electrical apparatus
- shell
- electrical
- section
- 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
- H01T1/00—Details of spark gaps
- H01T1/12—Means structurally associated with spark gap for recording operation thereof
Definitions
- the invention is based on an electrical apparatus according to the Preamble of claim 1.
- the operating state of the apparatus is often connected to an optical fiber if necessary, several kilometers from the machine in a control room horizontal evaluation device and checked there.
- a surge arrester described in this prior art contains a holding part in thermal contact with a body of the surge arrester made of a memory alloy and a spring-loaded one mounted on the holding part Actuating rod and one connected to a measuring device Optical fiber.
- the body of the surge arrester heats up impermissibly high temperatures, the holding part is deformed and gives the Operating rod free.
- the actuating rod interrupts the optical fiber, which indicates at the location of the measuring device that the surge arrester works incorrectly.
- a medium or high voltage switching device described in EP-0 338 374 A2 has a variety of sensors based on what information is important about a switching device record the relevant physical quantities and send them to an optical fiber direct central evaluation device. Such information concerns, for example the continuous measurement of the size and voltage of the in the switching device conducted current or the density, pressure and temperature of an im Switching device of existing extinguishing gas. This information can also Position or the speed of those that can be brought into or out of engagement with one another Switch contacts or a break for the movement of the switch contacts required drive linkage include. For this purpose, sensors are preferred Position indicators, such as reflection light barriers or inductive proximity switches, intended.
- the information supplied to the central evaluation device is used for one Self-diagnosis of the switching device and allow in addition to constant control of the operating status also early detection of irregularities of the Switching device.
- DE-195 06 307 A1 describes a device for displaying the faulty state described a surge arrester.
- This device has one Switching element on which, when a fault current occurs, the two parts of a two-part metal housing carrying a display element Visualization of the display element and the formation of a fault current accepting galvanic connection moves against each other.
- This device can only on site in a plant, but not from one central evaluation device can be monitored.
- the object of the invention is to achieve this to create an electrical apparatus of the type mentioned at the beginning, which not only expresses a faulty state which is expressed in a fault current reports to a central evaluation device, but rather this fault current switches off at the same time and then identified in a simple and safe manner, can be removed and replaced.
- the electrical apparatus according to the invention is characterized in that the The fault current has already been reported in the central evaluation device interrupted and the defective apparatus by forming an optical Display element is marked. The faulty apparatus can then go on site be identified quickly. Because the optical fiber can be plugged into this device connected, the apparatus can be removed quickly and by an error-free one Apparatus to be replaced.
- the electrical apparatus according to the invention in Cable run of the optical waveguide in series with at least one other a portion of the optical fiber as a sensor-containing electrical apparatus connected. It can then be identified with only one optical fiber in the control room become faulty in a group of electrical apparatuses is working. Is the moving part of each of the electrical devices with one Display element equipped, so it can be easily determined on site which one Device from the group of devices is malfunctioning.
- These are preferably electrical apparatus one phase of a multi-phase power network assigned, d. H. locally closely adjacent in a plant or in a field arranged.
- Such a system for displaying the state of an electrical Devices in a control room located away from the device can also be used Realize extremely simple means, can easily in retrospect existing high or medium voltage systems or fields are installed and is also characterized by great reliability.
- TR denotes a transformer which feeds high voltage into a three-phase high-voltage line having three conductors R, S, T.
- One of three surge arresters A R , A S , A T is suspended from each of the three phase conductors R, S, T.
- the surge arresters are each electrically connected to one of the phase conductors R, S, T by one of two power connections and are each fastened to a grounded holder G designed as a scaffold using a support insulator I.
- the second of the two current connections of each of the surge arresters A R , A S , A T is electrically connected to the grounded holder G via a grounding cable E.
- An optical waveguide L is guided by a central evaluation device AW through the surge arrester A T A S and pass to the surge arrester A R.
- the evaluation device AW is housed in a control room typically up to several kilometers away from the surge arresters and contains a light source LQ, for example a laser diode, which continuously feeds a light signal into the optical waveguide L during operation of the surge arresters, and a light signal which detects the fed-in light signal after passing through the surge arresters Receiver FW, for example a photo resistor.
- the receiver acts on a warning element containing, for example, a green and a red control lamp KG and KR.
- the optical waveguide L can be in the form of a loop, one end with the light source LQ and the other end is in active connection with the receiver FW.
- the conductor L can but also in the form of a stub, one of which End is in operative connection with the light source LQ, and their other end is finished with a reflector.
- Each of the surge arresters contains a sensor designed as a section LA of the optical waveguide L.
- This sensor is in each case part of a device 3 provided in each of the surge arresters, with which a faulty state of the associated surge arrester, for example a fault current flowing through the surge arrester, can be made optically visible on site.
- the surge arrester A R which is furthest away in the series connection of the surge arresters from the central evaluation device AW can contain a reflection light barrier fed by the light source LQ via the optical waveguide L and fed via the optical waveguide L into the receiver FW instead of an optical waveguide section LA.
- FIGS. 2 to 5 show two embodiments of the display device 3.
- the embodiment of the display device 3 shown in FIGS. 2 and 3 is usually provided in all three surge arresters. It has a potential-carrying part 2 which is electrically conductively connected to an earthable power connection of the surge arrester A R , A S , A T.
- the display device 3 also contains a two-part metal housing 4 made of a material that conducts electricity well, such as aluminum or an aluminum alloy, which is fastened to a switching element 5 of the display device 3.
- the switching element 5 comprises a cylinder-symmetrical, gas-tight formed insulating material housing 6 made of a brittle material, such as a highly filled polymer based on an epoxy, and two cylindrically symmetrical, led into the insulating material housing and in each case at one of the ends of the insulating material housing 6 held electrodes 7, 8.
- the two electrodes 7, 8 are standing one above the other on the axis of the insulating material housing 6 arranged and form at mutually facing free ends, of which the electrode 7 is designed as a tip Isolierstoffgepuruse 6 spark gap 9.
- the each other facing end sections of the electrodes 7, 8 are connected to the power connections one connected in parallel to the spark gap 9 and preferably designed as a fuse or PTC thermistor Resistor 10 connected.
- the resistor 10 is dimensioned in such a way that it is still held by the surge arrester 1 High current surge value, for example of 100 kA 4/10 ⁇ s can, and that when loaded above a predetermined Period, for example 0.1 ms, with one above one predetermined limit value, for example 20 A, its electrical conductivity, such as by melting or through a PTC transition, suddenly reduced.
- a predetermined Period for example 0.1 ms
- one above one predetermined limit value for example 20 A
- its electrical conductivity such as by melting or through a PTC transition
- the metal housing 4 is of two different diameters having shells 12, 13 formed, each with their bottoms are held at opposite ends of the switching element 5.
- the shell 12 having the larger diameter takes the the smaller diameter shell 13.
- the shell 12 has an opening in its bottom through which a galvanic part 2 of the surge arrester connected and an external thread connection of the Electrode 7 is guided.
- the shell 12 is not by means of a designated nut firmly with the upper end of the switching element 5 connected.
- the shell 12 carries at least one ins Contact element 14 directed inside the shell, which is ring-shaped is formed and has an inner cone.
- This contact element 14 is provided with an internal thread, which with a External thread of the shell 12 cooperates.
- the Shell 12 blow-out openings 15 for compressed gas. These blowouts can be restrained with a solid part inside the case Provide filters and be designed so that escaping compressed gas is guided in a predetermined direction.
- the shell 13 also has an opening in its bottom, through which an external thread has an earth potential laid connection of the electrode 8 is guided.
- the shell 13 is by means of an unspecified nut firmly with the lower end of the switching element 5 connected.
- the shell 13 carries on her from the shell 12 covered outside, for example as Color coating formed display element 16.
- the shell 13 is flared like a cone and is in the area of the shell edge on the outside as an electrical contact element 17 formed which on the inner cone of the annular contact element 14 is adjusted.
- the inside of the metal case 4 is by one from the bottom of the shell 13 to the edge of the shell 12 guided cover 18 completed.
- the optical waveguide L is with its section LA inside of the metal housing 4 out.
- the shell 12 two diametrically arranged bushings for the optical waveguide section LA on which the optical waveguide section LA, to the shell 13 provided inside the metal housing to lead.
- In the shell 13 are two through openings for the Optical fiber section LA provided.
- On the outside of the Shell 12 are two connecting parts of two fiber optic connectors 19, 20 attached.
- the optical fiber section LA becomes practically straight forward from the fiber optic connectors 19 through the shells 12 and 13 inside the Led metal housing 4, covers half the circumference of the Isolierstoffgeophuse 6 on the shortest route and will be practically again straight through the shells 13 and 12 to the fiber optic connector 20 led.
- a continuously emitted in the evaluation AW of the control room by the light source LQ signal is first passed through a cooperating part of the optical waveguide L to the surge arrester A T, passes through the optical fiber connector 19, the optical waveguide section LA, the optical fiber connector 20 and the thereto connecting part of the optical waveguide L to the surge arrester A S , from there in a corresponding manner to the surge arrester A R and via an adjoining part of the optical waveguide L guided as a loop to the receiver FW of the evaluation device AW.
- the surge arresters A R , A S , A T work correctly. This can be indicated, for example, by activating the green control lamp KG.
- the pressurized gas that forms suddenly blows up the brittle insulating material housing 6 then drives the electrode 8 and the rigidly connected to it Shell 13 down to the state shown in Fig.3 Display device 3 is reached.
- the compressed gas is through the Blow-out openings from the inside of the shells 12 and 13 enclosed metal housing 4 ejected.
- resulting splinters are from Metal housing 4 retained in the interior of the housing.
- the Optical waveguide section LA destroyed and the Light source LQ led light signal to the receiver FW interrupted. Instead of the green KG, the red one now lights up Control lamp KR lights up and signals in the control room that one of the three surge arresters is defective.
- one of both ends of the section LA is connected to a connecting part of the plug connection 19.
- the other end of LA is closed by a reflector 21.
- the reflector 21 does not necessarily have to be attached to the shell 12, but can alternatively also be attached to a region of the outer surface of the shell 13 facing the plug connection 19.
- the section LA can then be omitted and the reflector 21 is then part of a reflection light barrier.
- Such a surge arrester is executed in the series circuit of three surge arrester A R, A S, A T away from the central evaluation device AW furthest surge A R.
Landscapes
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Thermistors And Varistors (AREA)
- Gas-Insulated Switchgears (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Control Of El Displays (AREA)
Description
- Fig.1
- eine dreiphasige Hochspannungsleitung, bei der jeder Leiter mit einem als Überspannungsableiter ausgeführten elektrischen Apparat nach der Erfindung elektrisch leitend verbunden ist und der Zustand dieser Apparate über einen Lichtwellenleiter in einer von der Leitung entfernt angeordneten zentralen Auswertevorrichtung überprüft wird,
- Fig.2
- eine Aufsicht auf einen axial geführten Schnitt durch eine im wesentlichen zylindersymmetrisch ausgebildete und in einen Stromanschluss eines der Überspannungsableiter gemäss Fig.1 eingebaute Anzeigevorrichtung mit einem als Abschnitt des Lichtwellenleiters ausgebildeten und beim Auftreten eines Fehlerstroms durch ein bewegliches Teil der Anzeigevorrichtung zerstörbaren Sensor vor dem Ansprechen,
- Fig.3
- die Anzeigevorrichtung gemäss Fig.2 nach dem Ansprechen,
- Fig.4
- eine geringfügig abgeänderte Ausführungsform der Anzeigevorrichtung gemäss Fig.2 vor dem Ansprechen, und
- Fig.5
- die Anzeigevorrichtung gemäss Fig.4 nach dem Ansprechen.
- AR, AS, AT
- Überspannungsableiter
- AW
- Auswertevorrichtung
- E
- Erdungskabel
- FW
- Empfänger
- G
- Halterung
- I
- Stützisolatoren
- KG, KL
- Kontrollampen
- L
- Lichtwellenleiter
- LA
- Lichtwellenleiterabschnitt
- LQ
- Lichtquelle
- R, S, T
- Phasenleiter
- TR
- Transformator
- 2
- potentialführendes Teil
- 3
- Anzeigevorrichtung
- 4
- Metallgehäuse
- 5
- Schaltelement
- 6
- Isolierstoffgehäuse
- 7, 8
- Elektroden
- 9
- Funkenstrecke
- 10
- Widerstand
- 11
- Sprengstoffladung
- 12, 13
- Schalen
- 14
- Kontaktelement
- 15
- Ausblasöffnungen
- 16
- Anzeigeelement
- 17
- Kontaktelement
- 18
- Abdeckung
- 19, 20
- Lichtwellenleiter-Steckverbindungen
- 21
- Reflektor
Claims (15)
- Elektrischer Apparat, insbesondere Überspannungsableiter (AR, AS, AT), mit einem als Sensor wirkenden Lichtwellenleiterabschnitt (LA) zur Erfassung der Lage eines beweglichen Teils des Apparates und mit Anschlussmitteln für einen Lichtwellenleiter (L) zur Übertragung eines vom Lichtwellenleiterabschnitt (LA) bei einer Lageänderung des beweglichen Teils abgegebenen Signals an eine zentrale Auswertevorrichtung (AW), bei dem der Lichtwellenleiterabschnitt (LA) derart gehalten ist, dass er nach der Lageänderung des beweglichen Teils zerstört ist, dadurch gekennzeichnet, dass die Anschlussmittel eine erste Lichtwellenleiter-Steckverbindung (19, 20) umfassen, dass der Lichtwellenleiterabschnitt (LA) an eine mit einem erdbaren Teil des elektrischen Apparates elektrisch leitend verbundene optische Anzeigevorrichtung (3) geführt ist, dass die Anzeigevorrichtung (3) ein zweiteiliges, ein optisches Anzeigelement (16) tragendes und ein Schaltelement (5) umschliessendes Metallgehäuse aufweist, und dass ein das Anzeigelement (16) tragendes, bewegliches erstes Teil des Metallgehäuses (4) beim Auftreten eines vom Apparat geführten Fehlerstroms unter Sichtbarmachung des Anzeige-elementes (16) und unter Bildung einer den Fehlerstrom übernehmenden galvanischen Verbindung mit dem zweiten Teil des Metallgehäuses (4) zusammenwirkt.
- Elektrischer Apparat nach Anspruch 1, dadurch gekennzeichnet, dass eines beider Enden des Lichtwellenleiterabschnitts (LA) an ein Verbindungsteil der ersten Lichtwellenleiter-Steckverbindung (19) und das andere Ende an ein Verbindungsteil einer zweiten Lichtwellenleiter-Steckverbindung (20) oder einen Reflektor (21) angeschlossen ist.
- Elektrischer Apparat nach Anspruch 2, dadurch gekennzeichnet, dass das an den Lichtwellenleiterabschnitt (LA) angeschlossene Verbindungsteil der ersten und/oder der zweiten Lichtwellenleiter-Steckverbindung (19, 20) und/oder der Reflektor (21) am elektrischen Apparat befestigt sind.
- Elektrischer Apparat nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Metallgehäuse (4) von zwei Schalen (12, 13) unterschiedlichen Durchmessers gebildet ist, wobei die Böden der beiden Schalen (12, 13) jeweils an entgegengesetzten Enden eines Isolierstoffgehäuses des Schaltelementes (5) gehalten sind, und die den grösseren Durchmesser aufweisende erste Schale (12) eine den kleineren Durchmesser aufweisende und auf ihrer Aussenseite das Anzeigeelement (16) tragende zweite Schale (13) aufnimmt.
- Elektrischer Apparat nach Anspruch 4, dadurch gekennzeichnet, dass die zweite Schale (13) konusartig aufgeweitet ist, und dass die erste Schale (12) an ihrem Rand mindestens ein ins Schaleninnere gerichtetes Kontaktelement (14) trägt, welches beim Verschieben der beiden Schalen (12, 13) die konusartige Aufweitung der zweiten Schale (13) unter Bildung der galvanischen Verbindung kontaktiert.
- Elektrischer Apparat nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, dass im Isolierstoffgehäuse (6) des Schaltelements (5) eine mit einem potentialführenden Teil (2) des Apparates elektrisch leitend verbundene Funkenstrecke (9) und eine Sprengstoffladung (11) vorgesehen sind.
- Elektrischer Apparat nach Anspruch 6, dadurch gekennzeichnet, dass parallel zur Funkenstrecke (9) ein ohmscher Widerstand (10) geschaltet ist.
- Elektrischer Apparat nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, dass der Lichtwellenleiterabschnitt (LA) durch die erste Schale (12) hindurch an die im Inneren des Metallgehäuses (4) vorgesehene zweite Schale (13) geführt ist.
- System zur Anzeige des Zustands des elektrischen Apparates (AR, AS, AT) nach einem der Ansprüche 1 bis 8 mit der zentralen Auswertevorrichtung (AW) und mit dem Lichtwellenleiter (L), dadurch gekennzeichnet, dass die zentrale Auswertevorrichtung (AW) eine bei Betrieb des elektrischen Apparates kontinuierlich ein Lichtsignal in den Lichtwellenleiter (L) einspeisende Lichtquelle (LQ) aufweist sowie einen Empfänger (FW), welcher das eingespeiste Lichtsignal nach Durchtritt durch den am elektrischen Apparat gehaltenen Lichtwellenleiterabschnitt (LA) detektiert.
- System nach Anspruch 9, dadurch gekennzeichnet, dass der Lichtwellenleiter (L) in Form einer Schleife ausgebildet ist, deren eines Ende mit der Lichtquelle (LQ) und deren anderes Ende mit dem Empfänger (FW) in Wirkverbindung steht.
- System nach Anspruch 9, dadurch gekennzeichnet, dass der Lichtwellenleiter (LQ) in Form einer Stichleitung ausgebildet ist, deren eines Ende mit der Lichtquelle (LQ) in Wirkverbindung steht und deren anderes Ende mit einem Reflektor (21) abgeschlossen ist.
- System nach einem der Ansprüche 9 bis 11, dadurch gekennzeichnet, dass im Leitungszug des Liohtwellenleiters (L) in Reihe mit dem elektrischen Apparat (AT) mindestens ein weiterer elektrischer Apparat (AS, AR) mit einem weiteren Abschnitt (LA) des Lichtwellenleiters (L) geschaltet ist.
- System nach Anspruch 12, dadurch gekennzeichnet, dass der in der Reihenschaltung der elektrischen Apparate (AR, AS, AT) von der zentralen Auswertevorrichtung (AW) am weitesten entfernte Apparat (AR) anstelle eines Lichtwellenleiterabschnitts (LA) eine von der Lichtquelle (LQ) über den Lichtwellenleiter (L) gespeiste und über den Lichtwellenleiter (L) in den Empfänger (FW) speisende Reflexionslichtschranke enthält.
- System nach einem der Ansprüche 12 oder 13, dadurch gekennzeichnet, dass die elektrischen Apparate (AR, AS, AT) jeweils einer Phase (R, S, T) eines Mehrphasenstromnetzes zugeordnet sind.
- System nach Anspruch 14, dadurch gekennzeichnet, dass jeder der elektrischen Apparate mit einem Hochspannungsanschluss an einem Leiterseil des Mehrphasennetzes aufgehängt und mit einem Stützisolator (I) an einer geerdeten Halterung (G) befestigt ist.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI9730367T SI0927445T1 (en) | 1996-09-18 | 1997-08-21 | Electrical apparatus, particularly a surge arrester and a display system for the state of the apparatus in a central evaluation device |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19637984 | 1996-09-18 | ||
DE19637984A DE19637984A1 (de) | 1996-09-18 | 1996-09-18 | Elektrischer Apparat, insbesondere Überspannungsableiter und System zur Anzeige des Zustands dieses Apparats in einer zentralen Auswertevorrichtung |
PCT/CH1997/000305 WO1998012780A1 (de) | 1996-09-18 | 1997-08-21 | Elektrischer apparat, insbesondere überspannungsableiter, und system zur anzeige des zustands dieses apparats in einer zentralen auswertevorrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0927445A1 EP0927445A1 (de) | 1999-07-07 |
EP0927445B1 true EP0927445B1 (de) | 2002-05-15 |
Family
ID=7805963
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97934404A Expired - Lifetime EP0927445B1 (de) | 1996-09-18 | 1997-08-21 | Elektrischer apparat, insbesondere überspannungsableiter, und system zur anzeige des zustands dieses apparats in einer zentralen auswertevorrichtung |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0927445B1 (de) |
AU (1) | AU3764497A (de) |
DE (2) | DE19637984A1 (de) |
HR (1) | HRP970492B1 (de) |
TW (1) | TW357476B (de) |
WO (1) | WO1998012780A1 (de) |
ZA (1) | ZA977464B (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004002582A1 (de) * | 2004-01-13 | 2005-08-04 | Siemens Ag | Optisch gezündete Funkenstrecke |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010038208A1 (de) * | 2010-10-14 | 2012-04-19 | Phoenix Contact Gmbh & Co. Kg | Überspannungsschutzvorrichtung |
LU93206B1 (en) | 2016-09-13 | 2018-03-16 | Abb Schweiz Ag | Protection of a surge arrester with a better protection against failure from thermal overload in case of a temporary overvoltage in an electrical grid line |
US11411386B2 (en) | 2019-04-29 | 2022-08-09 | Hubbell Incorporated | Disconnector device and overvoltage protection assembly including the same |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH615784A5 (en) * | 1977-07-14 | 1980-02-15 | Sprecher & Schuh Ag | Monitoring arrangement on an overvoltage arrester containing at least one spark gap |
DE3305234C2 (de) * | 1983-02-16 | 1986-02-27 | Felten & Guilleaume Energietechnik GmbH, 5000 Köln | Zugfester Draht aus einer faserverstärkten Harzstruktur mit mindestens einem darin eingeschlossenen Lichtwellenleiter |
DE3524101A1 (de) * | 1985-07-05 | 1987-01-08 | Battelle Institut E V | Verfahren und vorrichtung zur kontinuierlichen rberwachung des verschleisszustandes von materialien |
JPH01136305A (ja) * | 1987-11-24 | 1989-05-29 | Mitsubishi Electric Corp | 劣化監視装置 |
JPH01215002A (ja) * | 1988-02-24 | 1989-08-29 | Mitsubishi Electric Corp | 避雷器劣化監視装置 |
DE3812734A1 (de) * | 1988-04-16 | 1989-10-26 | Asea Brown Boveri | Verfahren und einrichtung zur steuerung einer antriebseinrichtung eines mittel- oder hochspannungsschaltgeraetes |
GB9005827D0 (en) * | 1990-03-15 | 1990-05-09 | Raychem Gmbh | Electrical protection apparatus |
DE4218170C1 (de) * | 1992-06-02 | 1993-05-27 | Siemens Ag, 8000 Muenchen, De | |
JPH06325909A (ja) * | 1993-05-13 | 1994-11-25 | Chubu Electric Power Co Inc | ケーブル防食層保護用アレスタの故障検知装置 |
DE19506307A1 (de) * | 1995-02-23 | 1996-08-29 | Abb Management Ag | Vorrichtung zur Anzeige eines fehlerhaften Zustands eines elektrischen Apparates, insbesondere eines Überspannungsableiters |
-
1996
- 1996-09-18 DE DE19637984A patent/DE19637984A1/de not_active Withdrawn
-
1997
- 1997-08-16 TW TW086111800A patent/TW357476B/zh active
- 1997-08-20 ZA ZA9707464A patent/ZA977464B/xx unknown
- 1997-08-21 WO PCT/CH1997/000305 patent/WO1998012780A1/de active IP Right Grant
- 1997-08-21 EP EP97934404A patent/EP0927445B1/de not_active Expired - Lifetime
- 1997-08-21 DE DE59707297T patent/DE59707297D1/de not_active Expired - Lifetime
- 1997-08-21 AU AU37644/97A patent/AU3764497A/en not_active Abandoned
- 1997-09-16 HR HR970492A patent/HRP970492B1/xx not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004002582A1 (de) * | 2004-01-13 | 2005-08-04 | Siemens Ag | Optisch gezündete Funkenstrecke |
Also Published As
Publication number | Publication date |
---|---|
EP0927445A1 (de) | 1999-07-07 |
WO1998012780A1 (de) | 1998-03-26 |
ZA977464B (en) | 1998-02-19 |
HRP970492B1 (en) | 2003-10-31 |
DE59707297D1 (de) | 2002-06-20 |
HRP970492A2 (en) | 1998-06-30 |
DE19637984A1 (de) | 1998-03-19 |
AU3764497A (en) | 1998-04-14 |
TW357476B (en) | 1999-05-01 |
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