Abb Research Ltd.

Asea Brown Boveri Ag

Abb Schweiz Ag

Abb Power Td & Company

Abb Hochspannungstechnik Ag

Abb T&d Technology Ag

Kurt Kaltenegger

Lukas Zehnder

Lutz Niemeyer

Thomas Schoenemann

Joachim Stechbarth

Bodo Bruhl

Christian Dahler

Robert Anderes

Walter Holaus

Michael Steurer

Lorenz Muller

Klaus Fr&ouml;hlich

Jens Rocks

Jeffry R Meyer

Xavier Kornmann

Klaus-Dieter Weltmann

Reto Weder

Max Claessens

Elias Julke

Leopold Ritzer

Christian Lindner

Jorgen Skindhoj

Werner Hofbauer

Ion Gavrilita

Manfred Seidel

Samuele Sartori

Gunter Speckhofer

Benedikt Lopfe

Electrical insulation system, which optionally contains a filler material and/or further additives, wherein said electrical insulation system comprises poly(dicyclopentadiene) as the main component, and method of making said electrical insulation system.

Electrical insulation system based on poly(dicyclopentadiene)

An electrical insulation system and method are disclosed which are based on poly(butylene terephthalate), wherein the poly(butylene terephthalate) contains a polymerized cyclic low molecular weight oligomeric poly(butylene terephthalate) resin. At least one filler material or a mixture of filler materials can be included. At least one hydrophobic compound or a mixture of hydrophobic compounds can also be included.

Electrical insulation system based on poly(butylene terephthalate)

The switching point in a high- or medium-voltage switch contains two fixed contact members ( ), a rotating, electrically conductive bridging contact member ( ), and a drive for moving the bridging contact member ( ). When the switching point is closed, the bridging contact member ( ) is fit in between the fixed contact members ( ) and short-circuits them. The drive is composed of two coils ( ) which surround the bridging contact member ( ) and are arranged in such a manner that the bridging contact member ( ) can be caused to rotate by a current in a respective one of the coils. The energy which needs to be applied to rotate the bridging contact member is less than for contact members which move in translation in comparable switching points. The energy required for opening and closing the switching point is thus reduced.

High-speed mechanical switching point

High-speed current-limiting switch

The switching point in a high or medium voltage switch contains two stationary switch pieces which are of cylindrical design and led coaxially into one another, to form an annular gap. A movable bridge switch piece constructed in the form of a contact ring fits into the annular gap when the switching point is closed. An electrodynamic drive comprising two coils moves the contact ring in the axial direction. By virtue of the low mass of the contact ring, the single moving part of the switching point can be switched on and off very quickly and efficiently.

Quick-action mechanical switching point

This hybrid circuit breaker has at least two series-connected arcing chambers which are operated by a common drive or by separate drives and are filled with different arc extinguishing media. The arc extinguishing and insulating medium in the first arcing chamber surrounds the second arcing chamber in an insulating manner. The aim is to provide a hybrid circuit breaker which can be produced economically and which has high availability. This is achieved, inter alia, wherein means are provided which always ensure that the movement of the first arcing chamber leads the movement of the second arcing chamber during a disconnection process, and that the movement of the second arcing chamber always leads the movement of the first arcing chamber during a connection process.

Hybrid circuit breaker

Arranged in the continuation of an arcing chamber (16) bounded by consumable rings (32a, 32b) are pressure chambers (25a, 25b) which are connected in each case to a heating volume (18), which concentrically surrounds the arcing chamber (16), via a return channel (28; 28b), which is rotationally symmetrical with reference to the switching axis and is at least initially of increasing cross section, and a non-return valve (29a; 29b). A circumferential blowout slot (19) opening into the arcing chamber (16) between the consumable rings (32a, 32b) issues from the heating volume (18). The pressure chambers (25a, 25b) are, moreover, connected via in each case a plurality of exhaust tubes (34a, 34b) to exhaust volumes (30a, 30b) and to one of them also via a pressure relief valve (37). The pinch pressure produced between the consumable rings (32a, 32b) during formation of an arc (17) leads to a pressure buildup in the pressure chambers (25a, 25b) which contributes via the return channels (28a, 28b) to building up in the heating volume (18) a high blowout pressure which on the occasion of the next zero crossing causes a strong gas flow through the blowout slot (19) into the arcing chamber (16), which quenches the arc (17).

Puffer type circuit breaker with arcing chamber, auxiliary shunting

Extending between a fixed tulip contact (1) and a slide tulip (4) is an arcing chamber (5) which is occupied in the closed position by a movable contact pin (3) which fills up both an exhaust (9) surrounded by the slide tulip (4) and a blowout opening (7) which is surrounded by the tulip contact (1) and connects the arcing chamber (5) to a pressure chamber (6). The arcing chamber (5) is surrounded by an annular heating volume (13) open toward the same. Arranged in the pressure chamber (6) is a charge (10) of explosive which is for the most part converted within approximately 10-30 ms after ignition to extinguishing gas, preferably predominantly nitrogen, the gas pressure moving the contact pin (3) toward the open position. After clearance of the blowout opening (7) and the exhaust (9), the arc drawn between the contact pin (3) and tulip contact (1) is blown out, something which is supported by the pressure buildup, to which the arc contributes, in the heating volume (13). The pressure chamber with the charge can also surround the arcing chamber in an annular fashion. In this case, it is also possible to support the opening movement by the explosion pressure, for example, via pistons.

Circuit-breaker with an explosive charge ignited during opening operation

In the switched-on position, under the influence of contact forces generated by elastic deflection or else by mechanical spreading, or spreading caused by the attraction of parallel currents or repulsion of antiparallel currents, of a switching pin (5) , the switching pins presses against the inner side of a first switching ring (4), which is rigid for the purpose of avoiding mechanical overloading and securing sufficient consumable reserves. By way of example, a support (30) of the switching pin (5) is adjoined by two parallel, elastic extensions (52a, 52b), which are separated by a slot (53) and respectively support a contact member (54a; 54b) by means of a connecting element (55a; 55b) forming half a screw thread, with the result that said contact member is in each case offset by 180.degree. relative to the extension (52a; 52b). In the switched-on position, therefore, the contact members (54a, 54b) are forced apart by the elastic deformation of the extensions (52a, 52b) which is caused by the attraction between the parallel partial currents through said contact members. The switching pin (5) is electrically conductively connected to a second switching ring (6), which is separated from the first switching ring (4) by an arc space.

Consumable switching arrangement

A wreath of contact fingers (4) directed radially toward a switching axis (1) presses in the closed position against the circumferential surface of a contact pin (2) with consumable heads (5) fitted on the ends. At an angle of approximately 90.degree., the contact fingers (4) adjoin webs (6) which are guided in the closing direction up to a housing part (7) at which they are permanently anchored and via which they connect the contact fingers (4) to an electric terminal. The webs (6) and--with the exception of the consumable heads (5)--the contact fingers (4) are produced in one piece from springy material of high conductivity. The contact with the contact pin (2) radially deflects the consumable heads (5) in the closing direction with elastic bending of the webs (6). The length (R) of the radial contact fingers and the length (L) of the axial webs (6) are selected such that the attraction of the parallel component currents through the latter approximately compensates the contact repulsion forces.

This power breaker has at least one quenching chamber, which is filled with an insulating medium, is of cylindrical design, extends along a central axis (2) and has a power current path, having two stationary consumable contact arrangements (5, 6) which are arranged on the central axis (2), are at a distance from one another in the axial direction and are arranged in the power current path. In the connected state, the consumable contact arrangements (5, 6) are electrically conductively connected by means of a moving bridging contact. An arc zone (24) is provided between the stationary consumable contact arrangements (5, 6). A rated current path, which is provided with moving rated current contacts, is arranged in parallel with the power current path. The bridging contact is arranged in the interior of the consumable contact arrangements (5, 6) extended along the central axis (2).

Power breaker

The power breaker is provided with a contact arrangement which is equipped with erosion-resistant contact members and has a stationary contact member (4), a contact member (4) which can move along a central axis (6) and an insulating nozzle (6) which concentrically surrounds the contact members (3, 4) and has a constriction (6). The insulating nozzle (6) is manufactured from an erosion-resistant plastic and is structured such that erosion channels which are formed run at right angles to the direction of the electrical field load. This insulating nozzle emits gases during disconnection, which particularly effectively support the production of blowing pressure in the arc zone.

This power breaker has an arcing chamber which is filled with an insulating medium and extends along a central axis (2). This arcing chamber is provided with a power current path which has two erosion contact arrangements (5, 6) which are arranged on the central axis (2), are at a constant distance from one another in the axial direction and bound an arcing zone. The arcing chamber also has a heating area (13), which is connected to the arcing zone, and a bridging contact which electrically conductively connects the erosion contact arrangements (5, 6) in the connected state. The bridging contact is arranged centrally in the interior of the erosion contact arrangements (5, 6). An annular gap (36) is provided between the erosion contact arrangements (5, 6) and opens directly into the heating area (13). In this power breaker, the flow behavior is significantly improved in the region between the arcing zone and the heating area (13).

This power breaker has at least one quenching chamber, which is filled with an insulating medium, is of cylindrical design, extends along a central axis (2) and has a power current path, having two stationary consumable contact arrangements (5, 6) which are arranged on the central axis (2), are at a distance from one another in the axial direction and are arranged in the power current path. In the connected state, the consumable contact arrangements (5, 6) are electrically conductively connected by means of a moving bridging contact. An arc zone (24) is provided between the consumable contact arrangements (5, 6). A rated current path is arranged in parallel with the power current path. The power breaker is provided with at least one source for a highly pressurized insulating medium. The medium passes from this source directly into the arc zone (24), through at least one injection channel (62, 63). This high-pressure injection considerably improves the breaking capacity of the power breaker.

The stock contains an insulating-material matrix and a filler embedded in the matrix and is distinguished by a cellular structure. The predominant portion of the cells is filled with a material having arc-extinguishing properties or contains a material which, on exposure to an arc, forms arc-extinguishing gas. For the purpose of improving the making and breaking capacity, such a stock can advantageously be employed in a gas-blast circuit breaker in which arc-extinguishing gas is blown onto the switching arc. This involves the stock preferably being positioned at such points guiding the arc-extinguishing gas, at which the stock is exposed to the radiation of the arc and the thermal action of arc gases.

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Lengnau, Switzerland

Kurt Kaltenegger