EP3132461B1 - Dispositif de commutation électrique avec buse auxiliaire - Google Patents
Dispositif de commutation électrique avec buse auxiliaire Download PDFInfo
- Publication number
- EP3132461B1 EP3132461B1 EP15741875.7A EP15741875A EP3132461B1 EP 3132461 B1 EP3132461 B1 EP 3132461B1 EP 15741875 A EP15741875 A EP 15741875A EP 3132461 B1 EP3132461 B1 EP 3132461B1
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- EP
- European Patent Office
- Prior art keywords
- shield
- switching device
- contact
- auxiliary nozzle
- insulating body
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
- H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
- H01H33/7023—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
- H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
- H01H33/7038—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by a conducting tubular gas flow enhancing nozzle
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
- H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
- H01H33/7069—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by special dielectric or insulating properties or by special electric or magnetic field control properties
Definitions
- the invention relates to the field of high voltage (HV) switching technology and concerns a gas-insulated HV switching device according to the first part of the independent claim 1, particularly for use as an earthing device, a fast-acting earthing device, a circuit breaker, a generator circuit breaker, a disconnector, a combined disconnector and earthing switch, or a load break switch in power transmission and distribution systems.
- HV high voltage
- the high voltage usually exceeds 1 kV, and typically concerns nominal voltages like 36, 123 or 365 kV.
- Switching devices are well known in the field of medium and high voltage switching applications. They are predominantly used for interrupting a current when an electrical fault occurs.
- circuit breakers have the task of opening contacts and keeping them far apart from one another in order to avoid a current flow, even in case of high electrical potential originating from the electrical fault itself.
- the electrical switching devices like said circuit breaker, may have to be able to carry high nominal currents of 4000 A to 6300 A and to switch very high short circuit currents of 40 kA to 80 kA at very high voltages of 110 kV to 1200 kV.
- the operation principle of circuit breakers is known and will not be described here in detail.
- circuit breakers comprise an arcing contact arrangement used for taking over the current during the opening and closing operation of the device.
- one type of circuit breakers uses a tulip-shaped arcing contact, comprising contact fingers arranged concentrically around a longitudinal axis of the circuit breaker in a so-called finger cage. This arcing configuration is called a contact tulip.
- the mating arcing contact is a rod or a tube which is inserted into the finger cage of the contact tulip during a closing operation of the switching device.
- An auxiliary nozzle which is made of a halogenated polymer, like polytetrafluoroethylene (PTFE) encloses at least partially the contact tulip.
- a main nozzle partially encloses the mating arcing contact, which also partially encloses the auxiliary nozzle.
- PTFE polytetrafluoroethylene
- the contact tulip and the mating arcing contact are directly exposed to high electric field stress during switching operations.
- these two arcing contacts are exposed to electric arcs causing erosion of the contacts, thus reducing their capability to handle high electrical field strengths. Therefore, the contact tulip has to be partially shielded by the nominal contact.
- this creates a higher probability that a leader may propagate from the mating arcing contact into a heating channel formed by walls of the auxiliary and main nozzle and may cause puncturing of the main nozzle.
- the thermal performance indicator di/dt-limit represents the maximum value of the current slope at current zero for which the arc can be extinguished under a given clearing pressure.
- a circuit breaker has better thermal interruption performances than another one, if under the same blowing pressure it is capable of interrupting steeper currents, i.e. has a larger di/dt-limit.
- the larger the di/dt-limit of the breaker under the same blowing pressure conditions the lower is the clearing pressure required to interrupt a given current. It is desirable to reduce the minimum clearing pressure required for interrupting electric arcs in order to avoid a too high pressure build-up and the resulting excessive mechanical stresses.
- thermal interruption capability can be increased by both increasing the blowing pressure (brute force approach) and by profiling the main nozzle contours and/or the arcing contact contours in a way as to ensure efficient cooling of the gas.
- the latter approach relies strongly on the nozzle system that can change significantly from shot to shot, which may worsen the interruption capability of the circuit breaker.
- Circuit breakers are designed in a way that the insulating and cooling gas is accelerated effectively in the nozzle system.
- the flow between the insulating and auxiliary nozzle should reach sonic conditions on either side of the stagnation point at a comparatively short distance from it and then accelerate to supersonic speed.
- This flow pattern corresponds to an effective convective cooling of an arc and favors the interruption of the conductive path.
- interrupters with nozzles which are as good as new, e.g. typically for the first two to three shots.
- the nozzle cross-section changes and the sonic conditions shift, thereby worsening the convective cooling of the arc and consequently the thermal interruption performance of the circuit breaker. Therefore, the di/dt-limit for a given clearing pressure gets smaller shot after shot and the required clearing pressure must be increased.
- a gas-insulated HV switching device of the type defined in the first part of claim 1 is described in EP 1 772 882 .
- the switching device comprises a contact arrangement with two arcing contacts, one of which being designed as a contact tulip, an auxiliary nozzle, a main insulating nozzle and a nominal contact which partially encloses the contact tulip, the auxiliary and the main nozzle and which protrudes along an axis beyond a free end of the contact tulip.
- the nominal contact acts as a tubular electrostatic shield which screens the contact tulip against the strong electric field which in a current interruption process stresses a gap which is formed after disconnection of the two arcing contacts.
- the known switching device further comprises a conductive element which is inserted into a cavity of the auxiliary nozzle and which is kept on floating electric potential. The conductive element acts as capacitor and controls the distribution of the afore-mentioned electric field.
- EP 1 544 881 describes a further gas-insulated HV switching device in which a conductive element is inserted into a cavity of a main insulating nozzle.
- the conductive element is kept on the potential of a contact tulip by means of a metallic screw connection which electrically connects the conductive element to the free end of the contact tulip and thus allowing an electric shielding action.
- EP 0 081 253 describes a circuit breaker with an auxiliary nozzle as an annular body arranged between the arcing contacts and the nominal contacts.
- the annular body has a conductive ring at its narrowest location. In this way it is avoided that the electric arc forming during switching processes of the circuit breaker comes into contact with the auxiliary nozzle and deteriorates it.
- the objective of the invention is to improve the switching performance and the reliability of the known switching device.
- a gas-insulated HV switching device is provided with a contact arrangement extended along an axis and comprising an arcing contact designed as a contact tulip and a further arcing contact.
- the contact arrangement further comprises an auxiliary nozzle enclosing at least partially the contact tulip, a main insulating nozzle enclosing at least partially the auxiliary nozzle such that a heating channel is formed between the auxiliary and the main insulating nozzle and a tubular electrostatic shield which protrudes along the axis beyond a free end of the contact tulip.
- the tubular electrostatic shield is electrically connected to the contact tulip and is integrated in an electrical circuit comprising a current limiter and extending from the shield through the current limiter to an end of the contact tulip which is arranged opposite its free end.
- the tubular electrostatic shield is kept on the potential of the contact tulip and surrounds the contact tulip with a small distance.
- the contact tulip is almost completely electrostatically shielded against a strong electrical field which the recovery voltage builds-up in a current breaking process after current zero in a gap being bordered from the separated arcing contacts.
- the formation of craters and peaks in the contact tube which the switching arc induces in the current breaking process are no more effective and do not reduce the dielectric recovery and thus the switching performance, the reliability and the endurance of the switching device.
- the electrostatic shield is part of the auxiliary nozzle and surrounds the contact tulip and thus also the damages caused by arc erosion, like craters and peaks on the surface of the contact tulip, the contact tulip is shielded radially but also axially very effectively. Unavoidable wear of the contact tulip no more decreases the dielectric recovery of the switching device. Thus almost a minimum size of the gap ensures a safe breaking of the current and can be achieved without additional safety measures, like a high relative velocity of the arcing contacts during current breaking and/or a maximum size of the contact tulip.
- auxiliary nozzle together with the contact tulip can be placed further downstream with respect to a shielding of a the nominal contact. This results in a smaller probability of puncturing of the main nozzle due to the fact that a leader is more likely to be directed towards the tulip than into the heating channel, as mentioned above.
- the electrical connection of the electrostatic shield to the contact tulip via the current limiter makes the same potential in the contact tulip and in the shield. In this way the electric field is advantageously shifted away from the contact tulip. The contact tulip is consequently subjected to lower electric field stresses. Furthermore, the current limiter keeps away any damaging current flow between the shield and the contact tulip as the case arises that the switching arc roots on the shield. The current limiter then builds up a resistance which is higher than the resistance in a current path with the switching arc rooting on the contact tulip. Thus the switching arc only temporarily roots on the shield and in a short time jumps to the contact tulip.
- At least a section of the electrical circuit can form the current limiter which in a preferred embodiment of the invention can comprise a semi-conductive material, the specific resistance of which being at least 0,3 [k ⁇ m].
- the auxiliary nozzle in coaxial arrangement can comprise an insulating body and the tubular electrostatic shield.
- the tubular electrostatic shield is metallic an electrical connection between the shield and the contact tulip then can form the current limiter.
- a current limiter can be designed as resistor which is configured as a section of the insulating body and which can be supported on a carrier of the contact tulip.
- the current conductor can also be designed as a resistor which can be attached to the insulating body and which can be supported on the carrier of the contact tulip.
- the shield can be entirely enclosed in the insulating body.
- the material of the insulating body can be a halogenated polymeric material and the shield can be arranged on an internal surface of the insulating body and preferably can start downstream a throat on a conically enlarging portion of the auxiliary nozzle and can extend downstream to a tubular portion of the insulating body.
- the shield then can comprise a conductive layer which can be applied to the internal surface and which can comprise either a sprayed conductivity lacquer or a metallic material being deposited on the afore-etched internal surface.
- the shield can further comprises a tubular body of a metallic or semiconductive material which can be kept on the potential of the conductive layer and which can be deposited electrochemically or mechanically on the conductive layer or which can be plugged in the insulating body.
- an insulating coating can be applied to the shield or an insulating sleeve can be plugged in the insulating body.
- the halogenated polymer usually is a polytetrafluoroethylene (PTFE) but can also be another halogenated polymer used in HV technology, like polytrifluoromonochloroethylene.
- the material of the shield can be metallic and can comprise aluminum, chromium, copper, iron, silver, tungsten etc. resp. can comprise alloys with one or more of the afore-listed metals, in particular alloys which resist switching arc erosion.
- the afore-mentioned metallic or semiconductive tubular body can comprise a semiconductive hollow cylindrical insert which is plugged in an annular recess of the insulating body, and an electrically conducting annular part of the shield preferably can fill an undercut of the recess.
- the tubular electrostatic shield can also be formed as a free end of the auxiliary nozzle, wherein the free end can be positioned adjacent to the heating channel or can be separated from the heating channel by an external portion of the insulating body.
- the shield can be made of ablation-resistant material.
- Such a material additionally mitigates the decrease of the switching performance of the switching device since it keeps the optimal flow conditions by using ablation resistant materials in the body of the auxiliary nozzle. By reducing the extent of ablation, the pressure peak in the heating volume is reduced.
- the use of such a material in the auxiliary nozzle opposes the decrease of di/dt-limit for a given clearing pressure of the switching device during its use because the nozzle comprising non-ablating or ablation-resistant material keeps its shape. It is thus ensured that the section where the gas travels at sonic speed remains at the auxiliary nozzle in all arcing times or shots, thereby ensuring an efficient cooling of the arc.
- the thermal interruption performance is kept more stable throughout the shot sequence. Thus, no or much less worsening of the circuit breaker ratings is achieved.
- the invention also includes an auxiliary nozzle for an embodiment of the gas-insulated high voltage switching device according to the invention in which the auxiliary nozzle in coaxial arrangement comprises the insulating body, the tubular electrostatic shield and the current limiter, and in which the auxiliary nozzle further comprises a terminal for electrically connecting the electrostatic shield to an end of the contact tulip which is opposite its free end.
- FIGS 5 to 8 sectional side views of four further embodiments of the switching device according to the invention.
- the invention is described for embodiments in which the gas-insulated high voltage switching device is configured as circuit breaker.
- the figures are shown in a schematized way the arc extinguishing chambers of five embodiments of the switching device according to the invention.
- the principles described in the following also apply for the usage of the invention in other switching devices, e.g. of the type mentioned at the beginning.
- the arc extinguishing chambers shown in the figures comprise an axial symmetry and are filled with an insulating gas with arc-extinguishing properties, like SF 6 , N 2 , CO 2 , air or mixtures of such gases with each other.
- Typical filling pressures are a few, typically 5 or 8 bar.
- Further filling gases may comprise an organofluorine compound being selected from the group consisting of: a fluoroether, an oxirane, a fluoroamine, a fluoroketone, a fluoroolefin, and mixtures and/or decomposition products thereof.
- fluoroether refers to at least partially fluorinated compounds.
- fluoroether encompasses both fluoropolyethers (e.g.
- fluoromonoethers as well as both hydrofluoroethers and perfluoroethers
- oxirane encompasses both hydrofluorooxiranes and perfluorooxiranes
- fluoroamine encompasses both hydrofluoroamines and perfluoroamines
- fluoroketone encompasses both hydrofluoroketones and perfluoroketones
- fluoroolefin encompasses both hydrofluoroolefins and perfluoroolefins. It can thereby be preferred that the fluoroether, the oxirane, the fluoroamine and the fluoroketone are fully fluorinated, i.e. perfluorinated.
- the dielectric insulation medium is selected from the group consisting of: a (or several) hydrofluoroether(s), a (or several) perfluoroketone(s), a (or several) hydrofluoroolefin(s), and mixtures thereof.
- the dielectric insulation medium can further comprise a background gas or carrier gas different from the organofluorine compound (in particular different from the fluoroether, the oxirane, the fluoroamine, the fluoroketone and the fluoroolefin) and can in embodiments be selected from the group consisting of: air, N 2 , O 2 , CO 2 , a noble gas, H 2 ; NO 2 , NO, N 2 O; fluorocarbons and in particular perfluorocarbons, such as CF 4 ; CF 3 I, SF 6 ; and mixtures thereof.
- a background gas or carrier gas different from the organofluorine compound in particular different from the fluoroether, the oxirane, the fluoroamine, the fluoroketone and the fluoroolefin
- a background gas or carrier gas different from the organofluorine compound (in particular different from the fluoroether, the oxirane, the fluoroamine, the fluoroketone and the fluoro
- Each arc extinguishing chamber comprises a housing 10 and a contact arrangement comprising two contact members 20 and 30 which are arranged in the housing 10 and can be moved relative to each other along an axis A.
- a mechanical drive D can move the contact member 20 along the axis A, whereas the contact member 30 is mounted stationary.
- the housing comprises a hollow cylindrical insulator 11 which on its left end supports a hollow metal body 12 and on its right end a hollow metal body 13.
- the hollow body 12 resp. 13 surrounds the contact member 20 resp. 30.
- the hollow metal body 12 resp. 13 is electrical conductively connected to the contact member 20 resp. 30 and serve as one of the two current terminals of the contact assembly.
- the switching device is a dead tank breaker and thus comprises a gas-filled metal case which is connected to ground (not shown in fig.1 ).
- the metal case encloses the housing 10 in a gas-tight manner and receives exhaust gases which escape the housing 10 when the switching device breaks a current.
- the before-mentioned ends of the hollow metal bodies 12, 13 are designed as stationary hollow shields 14, 15 and control the electric field in a gap T which during opening or closing the contact assembly is arranged between the free ends of the two contact members 20, 30.
- the shields 14, 15 can be eliminated if the circuit breaker is designed as a live-tank breaker.
- Each contact member 20 resp. 30 comprises an arcing contact 21 resp. 31 and a nominal contact 22 resp. 32 which surrounds the corresponding arcing contact 21 resp. 31 coaxially.
- the arcing contact 21 is designed as a contact tulip and comprises a plurality of contact fingers which can be arranged in a finger cage or which can be cut in a suitable sleeve.
- the contact tulip 21 and the nominal contact 22 in an electrical conducting manner are fixedly secured to a cylindrically designed contact carrier 23 of the contact member 20.
- a sliding contact 16 supported on the hollow metal body 12 in a current conducting manner connects the body 12 to the contact carrier 23 resp. to the arcing 21 resp.
- the arcing contact 31 is rod-shaped in this embodiment, but can also be designed as a contact tulip.
- the arcing contact 31 and the nominal contact 32 are in an electrical conducting manner connected to the hollow metal body 13. If required the arcing contact 31 can be arranged such that it can be moved axially within the stationary contact member 30.
- the housing 10 further encloses an auxiliary nozzle 40 and a main insulating nozzle 50 which partly encloses the auxiliary nozzle.
- Both nozzles are manufactured of a halogenated polymer, typically on the basis of a polytetrafluorethylene (PTFE).
- Both nozzles 40, 50 are fixedly secured to the contact carrier 23 and are kept in coaxial arrangement between the contact tulip 21 lying inside and the hollow nominal contact 22 lying outside.
- the auxiliary nozzle 40 surrounds the contact tulip 21 and protrudes beyond the free end of the same.
- the auxiliary nozzle 40 and the surrounding main nozzle 50 border an annular heating channel 61 which connects an arcing zone to a heating volume 60 or to a puffer chamber.
- the two contact members 20, 30 contact one another, wherein the contact tulip 21 receives a head of the arcing contact 31 which is shaped as a plug.
- the contact members 20, 30 are disconnected by means of the drive D.
- the current to be interrupted commutates into a electrical circuit which includes the arcing contacts 21, 31.
- the arcing contacts 21, 31 separate and a switching arc S is struck between the contact tulip 21 and the head of the plug-shaped arcing contact 22 (shown in fig. 1 below the axis).
- the arc S generates pressurized arcing gases which via heating channel 61 flow into the heating volume 60 in which they are stored as arc extinguishing gas.
- the stored arc extinguishing gas - where necessary additionally pressurized by means of a puffer device - passes the arcing zone and afterwards a throat 45 of the auxiliary nozzle 40 as arc extinguishing gas flow P (only shown in fig.2 ) and blows the arc S beyond current zero until the current is interrupted.
- FIGS 2 and 3 show an embodiment of the auxiliary nozzle 40 which considerably amends the dielectric recovery of the switching device according to the invention.
- the auxiliary nozzle in coaxial arrangement comprises an insulating body 41 and a tubular shield 42 which protrudes along the axis A beyond a free end of the contact tulip 21.
- the shield 42 is electrically connected to the contact tulip 21 and is integrated in an electrical circuit which comprises a current limiter and which extends from a section of the shield 42, which protrudes the free end of the contact tulip 21, across the current limiter to an end of the contact tulip 21 which is arranged opposite its free end.
- the shield 42 is part of the auxiliary nozzle 40 and surrounds - as shown in fig.2 - the contact tulip 21 and thus also damages caused by arc erosion, like craters and peaks on the surface of the contact tulip 21.
- the contact tulip 21 is screened radially but also axially very effectively. Unavoidable wear of the contact tulip 21 no more decreases the dielectric recovery of the switching
- a minimum size of the gap T which ensures a safe breaking of the current, can be achieved without additional safety measures, like a high relative velocity of the contact tulip 21 and the arcing contact 31 during current breaking and/or like a maximum size of the contact tulip 21.
- the thickness of the shield 42 is only a few 100 ⁇ m. For reason of its small thickness and its arrangement in the auxiliary nozzle 40 the space requirements of the shield 42 are negligible.
- the auxiliary nozzle 40 can replace the auxiliary nozzle of a switching device according to prior art and thus can improve the dielectric recovery of the switching device without any additional place requirements.
- the auxiliary nozzle 40 of the switching device according to figures 1 and 2 comprises a metallic shield 42.
- the electrical connection between the shield 42 and the contact tulip 21 forms the current limiter.
- the current limiter can be configured as a resistor 43 resp. 44.
- the resistor 43 is configured as a section of the insulating body 41 and then can be supported on the carrier 23 of the contact tulip 21 (embodiment according to fig.2 above the axis A). An end of the resistor 43 then forms a current terminal 47 of the shield 42 which ensures that the shield 42 and the resistor 43 are electrically connected to the contact carrier 23 and thus to the contact tulip 21.
- the resistor 44 is configured as a resistor modul and is set in an electrically conducting manner on an end of the insulating body 41 and is supported on the carrier 23 of the contact tulip 21 (embodiment according to fig.2 below the axis A).
- the end of the resistor 44 which is positioned on the contact carrier 23 forms the current terminal 47 of the shield 42 which ensures that the shield 42 and the resistor 44 are electrically connected to the contact carrier 23 and thus to the contact tulip 21.
- Each resistor 43 resp. 44 comprises an electrically conducting polymer, in particular a PTFE having a specific resistance of at least 0,3 ⁇ m, and limits a current through the shield 42 which can be fed during current breaking with charge carriers generated from the switching arc S.
- the shield 42 is arranged on an internal surface of the insulating body 41 and preferably starts downstream a throat 45 of the auxiliary nozzle, which the arc extinguishing gas flow P passes, that means on a conically enlarging portion of the auxiliary nozzle 40.
- the shield 42 extends downstream to the resistor 44 resp. to a tubular portion of the insulating body 23 which comprises the resistor 43.
- the resistor 43 resp. 44 is integrated in an electrical circuit which extends from the shield 42 to an end of the contact tulip 21 which is arranged opposite its arc-exposed free end.
- the design of the electrical circuit and the resistor 43 resp. 44 ensure that the root of the switching arc S is kept away resp. is quickly removed from the shield 42 and is kept on the free end or within the interior of the contact tulip.
- Halogenated polymers like PTFE, comprise an anti-adhesive surface.
- a portion of the internal surface of the insulating body 42 which holds the shield 42 comprises a roughened and adhesive surface structure.
- Such a structure can be manufactured using a known reduction method in which the a portion of the anti-adhesive surface of the PTFE is etched with a reducing agent, in particular an alkali metal, like natrium.
- the reducing agent is applied to the anti-adhesive surface of the insulating body 42 either as vapour ( US 4,885,018 A ), as solution ( US 5,874,154 A ) or as solid ( US 2011/0236567 A1 ).
- the roughened, anti-adhesive surface can be coated currentless with copper and then forms a conductive layer 42a.
- the conductive layer is shown in fig.3 and can be used as shield 42.
- an additional conductive layer 42b can be deposited in an electroplating process, in which for example an additional copper layer with a thickness of a few 100 ⁇ m can be deposited from an acid copper solution.
- the conductive layer 42a can also be manufactured in a spray or paint process in which a lacquer comprising a metal or semiconductor, like a lubricant on the basis of MoS 2 , is deposited as a layer on the internal surface of the insulating body 41. After drying the conductive layer 42a can be used as shield 42. In order to improve the electrical and mechanical properties of such a shield an additional conductive layer 42b can be deposited in an electroplating process on the layer 42a. Furthermore the additional conductive layer 42b can be configured as tubular sleeve of a metallic or semiconductive material which is plugged in the insulating body 41 and which contacts the layer 42a in order to keep the sleeve 42b on the potential of the conductive layer 42a.
- an insulating layer 46 is applied to the shield 42.
- the layer 46 typically comprises a halogenated polymer, like PTFE, and can be deposited in a sputtering process as described in US 2011/0236567 A1 .
- the protection can also be achieved with an insulating sleeve which is plugged in the insulating body 41 and which covers the shield 42 instead of or additional to the insulating layer 46.
- the thickness of the insulating layer 46 resp. of the insulating sleeve can be some millimeters, typically 1 to 5 millimeters.
- the additional conducting layer 42b of the embodiment according to fig. 4 comprises a semiconductive hollow cylindrical insert 70 made of an electrically conductive halogenated polymer, preferably a PTFE filled with an electrically conducting powder, like carbon black.
- An annular section 71 of the insert 70 which protrudes the free end of the contact tulip 21 (shown in fig. 1 ) fills a recess 72 cut in the insulating body 41.
- the section 71 is configured in a manner to form together with the stationary hollow shield 14 and the nominal contact 22 (only shown in fig.1 ) an equipotential surface which in the open position of the switching device is largely spherical.
- two undercuts of the recess 72 are each filled with an electrical conducting annular part 73 resp. 74 of the shield section 71 in a manner to form a recess with coaxially arranged and axially extended faces 75, 76.
- the parts 73, 74 are electrically connected to the layer 42a and each comprise a convex profile which is designed in a manner to improve the screen function of the insert 70.
- the conducting layer 41a covers the recess 72 and electrically contacts the insert 70 when in a manufacturing process the insert 70 is plugged in the recess comprising the faces 75, 76.
- the thickness of the additional conducting layer 42b can be some millimeters, typically 1 to 5 millimeters.
- Fig. 5 and the following figures show sectional views of further embodiments of the switching device according to the invention. Also these embodiments of the switching device are rotationally symmetric around the longitudinal axis A and only an upper half of the sectional views is shown. Only the elements of the switching devices, in the following referred to as circuit breakers, which are related to the present invention will be described in the following, whereas other elements, e.g. nominal contacts, enclosure, etc. are not shown in the figures.
- the contact tulip 21 comprises multiple fingers arranged in a finger cage.
- the arcing contact 31 is rod-shaped in this embodiment. For the sake of simplicity, only one finger of the contact tulip 21 shown in Fig. 5 and the following figures.
- the auxiliary nozzle 40 is arranged partly around the contact tulip 21.
- the auxiliary nozzle 40 encloses the contact tulip 21 concentrically and protrudes beyond it, as can be seen in the figure.
- the arcing contact 31 is enclosed by the main nozzle 50, which partly encloses the auxiliary nozzle 40.
- a purpose of the auxiliary nozzle 40 and the main nozzle 50 is to form a path, here the heating channel 61, for guiding the insulating fluid into and out of the before-described arcing zone Z, which in fig.6 and the following figures is denoted with the reference numeral Z.
- the arcing contact 31 is enclosed by the main nozzle 50, which partly encloses the auxiliary nozzle 40 such that the heating channel 61 is formed between the main nozzle 50 and the auxiliary nozzle 40, which channel 61 fluidly connects the arcing zone Z of the circuit breaker with the heating volume 60 resp. a puffer chamber of the switching device.
- the arcing zone Z is a region in which the contact tulip 21 is moved back and forth for closing or opening the circuit breaker and in which the switching arc S develops between contact tulip 21 and the arcing contact 31 during an opening and closing procedure, thereby heating up the fluid located in the arcing zone Z.
- the auxiliary nozzle 40 comprises inside its body the shield 42.
- the shield 42 is electrically connected to the contact tulip 21.
- the material of the shield 42 is conductive or is semiconductive.
- the shield is made of a material which is similar to the surrounding auxiliary nozzle 40, which typically is made of a PTFE.
- An appropriate material is a PTFE- carbon compound. This has the advantage that the semiconducting shield 42 has similar mechanical properties like the surrounding material of the auxiliary nozzle 40.
- the shield 42 is fixedly embedded in the body of the auxiliary nozzle 40 and is entirely enclosed by the auxiliary nozzle 40.
- the shield 42 is a distinct element insertable into the body of the auxiliary nozzle 40.
- the shield 40 is electrically connected to the contact tulip 21 by a semiconductor ceramic or metal connection 48 having a predefined electrical resistance and acting as the afore-described current limiter.
- the shape of the shield 42 is shown only exemplarily in Fig. 5 . It is chosen depending on the dimensions of the auxiliary nozzle 40 and is chosen in such a way that electric field stresses are minimal.
- the shield 42 may be inserted into the auxiliary nozzle 40 as an independent element or it may form a part of the auxiliary nozzle 40, as mentioned above.
- the shield 42 may be manufactured first and the auxiliary nozzle 40 may be formed around it in known ways, e.g. by injection moulding of polytetrafluoroethylene.
- the shield 42 is elongated with respect to the axis A, and in particular has a tubular or substantially tubular shape concentric to the axis.
- the shielding of the contact tulip 21 is improved and thus the electrical field strength on the side of the contact tulip 42 does not depend on the condition of its surface. Instead, the electrical field strength on the side of the contact tulip is given by the electrical field strength of the shield 42.
- the auxiliary nozzle 40 comprises a shield 42 which is adjacent to the heating channel 61 and which consists of ablation-resistant material.
- ablation-resistant is understood as referring to a material exhibiting a minimum mechanical ablation in the presence of a switching arc, as compared to other available conductive or semiconducting materials, particularly as compared to nozzles made of PTFE. It encompasses also non-ablating materials.
- the shield 42 is electrically connected to the contact tulip 21.
- the material of the shield 42 is conductive or semi-conductive. Particularly, the material of the shield comprises metal, e.g. tungsten or wolfram or steel, and/or a ceramic semiconductor. It may also comprise or be made of PTFE with an appropriate filler.
- the shield 42 is only formed by the front part of the auxiliary nozzle 40.
- the rest of the auxiliary nozzle 40 comprises the insulating body 41, usually PTFE.
- the shield 42 is electrically connected to the contact tulip 21 by a semiconductor ceramic or metal connection 48.
- the connection 48 is formed by a line embedded in the insulating body 41.
- the auxiliary nozzle 40 of the embodiment according to fig.7 is made of ablation-resistant material.
- the material comprises a semiconducting ceramic and/or a metal, which ensure the ablation-resistance and the limitation of a possible current from the auxiliary nozzle 40 to an end of the contact tulip 21 which is opposite its free shielded end.
- the connection 48 between the auxiliary nozzle 40 and the contact tulip 21 is made of metal or ceramic.
- the semiconductor ceramic or metal connection 48 is dimensioned to have a pre-defined electrical resistance in order to avoid high current flow through the auxiliary nozzle 40.
- TIG-welding processed ceramic material can be used for this connection 48.
- Fig. 8 shows yet another embodiment of the switching device according to the invention. This embodiment only differs from the embodiment according to fig.7 in that the shield 42 is formed by the free end of the auxiliary nozzle 40 and is separated from the heating channel 61 by the insulating material of the body 41.
- the electrical switching device is preferably used as an earthing device, a fast-acting earthing device, a circuit breaker, a generator circuit breaker, a disconnector, a combined disconnector and earthing switch, or a load break switch.
Claims (17)
- Dispositif de commutation haute tension isolé au gaz avec un agencement de contact étendu le long d'un axe (A) comprenant :un premier contact d'arc conçu comme une tulipe de contact (21) et un deuxième contact d'arc (31),une buse auxiliaire (40) enfermant au moins partiellement la tulipe de contact (21), une buse d'isolation principale (50) enfermant au moins partiellement la buse auxiliaire (40) de telle sorte qu'un canal de chauffage (61) est formé entre la buse auxiliaire (40) et la buse d'isolation principale (50), etun blindage électrostatique tubulaire (42) qui fait saillie le long de l'axe (A) au-delà d'une extrémité libre de la tulipe de contact (21),caractérisé en ce que le blindage (42) est relié électriquement à la tulipe de contact (21) et est intégré dans un circuit électrique comprenant un limiteur de courant et s'étendant depuis le blindage (42) à travers le limiteur de courant jusqu'à une extrémité de la tulipe de contact (21) qui est disposée à l'opposé de son extrémité libre.
- Dispositif de commutation selon la revendication 1, dans lequel au moins une section du circuit électrique forme le limiteur de courant.
- Dispositif de commutation selon la revendication 2, dans lequel le limiteur de courant comprend un matériau semi-conducteur.
- Dispositif de commutation selon la revendication 3, dans lequel la résistance spécifique du matériau semi-conducteur est d'au moins 0,3 [kΩ·m].
- Dispositif de commutation selon une des revendications 2 à 4, dans lequel le blindage (42) est métallique, et dans lequel une connexion électrique (48) entre le blindage (42) et la tulipe de contact (21) forme le limiteur de courant.
- Dispositif de commutation selon une des revendications 1 à 5, dans lequel la buse auxiliaire (40) en agencement coaxial comprend un corps isolant (41) et le blindage électrostatique tubulaire (42).
- Dispositif de commutation selon la revendication 6, dans lequel le limiteur de courant est une résistance (43) qui est configurée comme une section du corps isolant (41) et qui repose sur un support (23) de la tulipe de contact (21).
- Dispositif de commutation selon la revendication 6, dans lequel le limiteur de courant est une résistance (44) qui est attachée au corps isolant (41) et qui repose sur un support (23) de la tulipe de contact (21).
- Dispositif de commutation selon une des revendications 6 à 8, dans lequel le blindage (42) est entièrement enfermé dans le corps isolant (41).
- Dispositif de commutation selon une des revendications 6 à 9, dans lequel le matériau du corps isolant (41) est un matériau polymère halogéné, et dans lequel le blindage (42) est disposé sur une surface interne du corps isolant (41) et de préférence démarre en aval d'un col (45) sur une partie s'élargissant coniquement de la buse auxiliaire (40) et s'étend en aval jusqu'à une partie tubulaire du corps isolant (41).
- Dispositif de commutation selon la revendication 10, dans lequel le blindage (42) comprend une couche conductrice (42a) qui est appliquée à la surface interne et qui comprend une laque de conductivité pulvérisée ou un matériau métallique déposé sur la surface interne préalablement décapée.
- Dispositif de commutation selon la revendication 11, dans lequel le blindage (42) comprend en outre un corps tubulaire (42b) dans un matériau métallique ou semi-conducteur qui est maintenu au potentiel de la couche conductrice (42a), et qui est déposé par voie électrochimique ou mécanique sur la couche conductrice (42a) ou qui est inséré dans le corps isolant (41).
- Dispositif de commutation selon la revendication 12, dans lequel le corps tubulaire (42b) comprend une pièce rapportée cylindrique creuse semi-conductrice (70) qui est insérée dans une encoche annulaire (72) du corps isolant (41), et dans lequel, de préférence, une partie annulaire électriquement conductrice (73, 74) du blindage (42) remplit une contre-dépouille de l'encoche (72).
- Dispositif de commutation selon une des revendications 6 à 13, dans lequel un revêtement isolant (46) est appliqué au blindage (42) et/ou dans lequel un manchon isolant est inséré dans le corps isolant (41).
- Dispositif de commutation selon une des revendications 6 à 14, dans lequel le blindage (42) est formé comme une extrémité libre de la buse auxiliaire (40) et dans lequel l'extrémité libre est adjacente au canal de chauffage (61) ou est séparée du canal de chauffage (61) par une partie externe du corps isolant (41).
- Dispositif de commutation selon la revendication 15, dans lequel au moins le blindage (42) est constitué d'un matériau résistant à l'ablation.
- Buse auxiliaire (40) pour le dispositif de commutation haute tension isolé au gaz selon une des revendications 6 à 16, la buse auxiliaire (40) en agencement coaxial comprenant le corps isolant (41), le blindage électrostatique tubulaire (42) et le limiteur de courant, et la buse auxiliaire (40) comprenant en outre une borne (47) destinée à relier électriquement le blindage électrostatique (42) à une extrémité de la tulipe de contact (21) qui est à l'opposé de son extrémité libre.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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EP14164783 | 2014-04-15 | ||
EP14191750 | 2014-11-04 | ||
PCT/EP2015/057018 WO2015158544A1 (fr) | 2014-04-15 | 2015-03-31 | Dispositif interrupteur haute tension à buse auxiliaire |
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EP3132461A1 EP3132461A1 (fr) | 2017-02-22 |
EP3132461B1 true EP3132461B1 (fr) | 2017-12-13 |
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EP15741875.7A Active EP3132461B1 (fr) | 2014-04-15 | 2015-03-31 | Dispositif de commutation électrique avec buse auxiliaire |
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WO (1) | WO2015158544A1 (fr) |
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FR2057344A5 (fr) * | 1969-08-12 | 1971-05-21 | Merlin Gerin | |
CH652528A5 (de) * | 1980-10-31 | 1985-11-15 | Bbc Brown Boveri & Cie | Druckgasschalter. |
EP0081253A1 (fr) | 1981-12-03 | 1983-06-15 | BBC Aktiengesellschaft Brown, Boveri & Cie. | Interrupteur à gaz comprimé |
DE3702025A1 (de) | 1987-01-24 | 1988-08-04 | Philips Patentverwaltung | Verfahren und vorrichtung zur herstellung von rotationssymmetrischen poroesen festkoerpern |
JP2524436B2 (ja) | 1990-09-18 | 1996-08-14 | インターナショナル・ビジネス・マシーンズ・コーポレイション | 表面処理方法 |
DE60311485T2 (de) | 2003-12-19 | 2007-11-15 | Abb Technology Ag | Gasisolierte Schaltvorrichtung mit einer Düse |
ES2351844T3 (es) | 2005-10-10 | 2011-02-11 | Abb Research Ltd. | Estimación de parametros para redes eléctricas. |
US20110236567A1 (en) | 2010-03-26 | 2011-09-29 | Semiconductor Energy Laboratory Co., Ltd. | Method of forming electrode |
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EP3132461A1 (fr) | 2017-02-22 |
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