EP1698029A1 - Dispositif de protection contre des surtensions a serrage - Google Patents
Dispositif de protection contre des surtensions a serrageInfo
- Publication number
- EP1698029A1 EP1698029A1 EP03819272A EP03819272A EP1698029A1 EP 1698029 A1 EP1698029 A1 EP 1698029A1 EP 03819272 A EP03819272 A EP 03819272A EP 03819272 A EP03819272 A EP 03819272A EP 1698029 A1 EP1698029 A1 EP 1698029A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- holding member
- unit
- protection unit
- connector
- equipment
- 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.)
- Granted
Links
- 230000008878 coupling Effects 0.000 claims abstract description 24
- 238000010168 coupling process Methods 0.000 claims abstract description 24
- 238000005859 coupling reaction Methods 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 5
- 239000004020 conductor Substances 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000007935 neutral effect Effects 0.000 description 7
- 238000009434 installation Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 206010011906 Death Diseases 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010616 electrical installation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000005493 welding type Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
- H01T1/14—Means structurally associated with spark gap for protecting it against overload or for disconnecting it in case of failure
Definitions
- the present invention relates to the general technical field of devices for protecting electrical equipment or installations, such as electrical appliances, circuits or distribution networks, against disturbances, possibly momentary, of electrical supply.
- the present invention relates more particularly to a device for protecting electrical equipment against voltage disturbances, such as overvoltages, in particular due to lightning.
- the present invention relates to a device for protecting electrical equipment against overvoltage comprising: - a protection unit comprising at least first and second poles, said poles being electrically connected to said equipment by means of connection means, - a means of functional coupling of the protection unit to the connection means, - a thermal disconnection means, functionally connected to said unit to interrupt the electrical connection between the unit and the equipment when the temperature of the unit reaches a predetermined critical value.
- Such devices which are sometimes designated under the name “parasurîense ⁇ rs” or “surge arresters”, are intended to drain lightning currents to the earth, and possibly to clip induced overvoltages at levels compatible with the behavior of equipment and materials connected downstream of protection devices.
- Known surge arresters can be based on different technologies, depending on the nature of the active protective element that they use.
- Spark arresters with spark gaps are known in particular, that is to say using, as an active protective element, a device comprising two electrodes placed facing each other and between which an ignition occurs causing a short- circuit, as soon as an overvoltage reaches a predetermined critical level.
- Such spark gap arresters can be subject mainly to two types of end of life.
- the spark gap can be subjected to short-circuit currents of very high intensity (several hundred or thousands of amps) that could cause its destruction.
- a breaking device of the fuse or circuit breaker type
- the surge arrester may be subjected to relatively low short-circuit currents (i.e.
- the intensity is for example between a few amps and 200 amps) which can lead to its destruction.
- a situation may for example be caused by a lightning strike causing the spark gap to start, followed or accompanied by an incident in the supply network (phase break, network imbalance) leading to the establishment of '' a weak but destructive short-circuit current, since it eventually causes the spark gap to heat up.
- spark gap surge arresters and more particularly spark gap surge arresters intended to protect the neutral, with a thermal disconnection system.
- spark arrester fitted with a thermal disconnection system are generally in the form of a housing made of dielectric material, in which a spark gap is soldered to a circuit comprising on the one hand the disconnector, and on the other hand means connection to connect the arrester to the installation to be protected.
- the thermal disconnector itself comprises a solder which when a predetermined critical temperature of the spark gap is reached, will melt and open the circuit.
- the first drawback stems from the need to use different soldering materials to achieve on the one hand the welding of the thermal disconnection means, and on the other hand the other assembly welds.
- the object assigned to the invention therefore aims to remedy the various drawbacks of the prior art mentioned above, and to propose a new device for protecting electrical equipment against overvoltages which is of a design and a particularly simple and inexpensive.
- Another object of the invention is to propose a new device for protecting electrical equipment against overvoltages which is very easily and quickly repairable.
- Another object of the invention is to propose a new device for protecting electrical equipment against overvoltages, the assembly of which is particularly simple and rapid.
- a complementary object of the invention aims to propose a new device for protecting electrical equipment against overvoltages of particularly compact design.
- Another object of the invention is to propose a new device for protecting electrical equipment against overvoltages having an improved level of safety in use.
- a device for protecting electrical equipment against overvoltages comprising: - a protection unit comprising at least a first and a second pole, said poles being electrically connected to said equipment by means of connection means, - a means of functional coupling of the protection unit to the connection means, - a thermal disconnection means, functionally connected to said unit to interrupt the electrical connection between the unit and the equipment when the temperature of the unit reaches a predetermined critical value, characterized in that said coupling means is designed to exert a tightening of the protection unit so as to ensure the electrical connection of said poles to the connection means.
- FIG. 1 illustrates, in a schematic view in longitudinal section, a protection device according to the invention.
- FIG. 1 illustrates, in a schematic cross-sectional view, an assembly operation of the device shown in Figure 1.
- FIG. 3 illustrates, in a schematic view in partial longitudinal section, the principle of embodiment of the thermal disconnector fitted to the device shown in FIGS. 1 and 2.
- FIG. 1 represents a device 1 for protecting electrical equipment against overvoltages, especially temporary overvoltages.
- electrical equipment By electrical equipment is meant here all types of apparatus, instruments, installations, networks, electrical circuits or telecommunications likely to be subject to electrical supply hazards from the point of view of voltage, and in particular to overvoltages due lightning.
- the device 1 for protection against overvoltages according to the invention thus advantageously constitutes a surge arrester.
- the device 1 comprises a protection unit or surge arrester cell 2.
- the protection unit 2 comprises at least, in a conventional manner, a first pole 2A and a second pole 2B, said poles being electrically connected to the equipment to be protected (not shown) by means of connection means 3.
- Said protection unit 2 comprises at least one non-linear electrical component, such as for example a varistor, a Zener diode, or a spark gap (for example air or gas).
- a non-linear electrical component such as for example a varistor, a Zener diode, or a spark gap (for example air or gas).
- the invention is not limited to a particular type of component.
- a protection unit 2 comprising a spark gap 2C, and more specifically a spark gap 2C specially designed to protect a neutral line, that is to say be connected between the neutral and the Earth.
- Such a spark gap 2C is advantageously in the form of a cylindrical unitary housing comprising two parallel flat faces 20A, 20B respectively supporting the first and second poles 2A, 2B, as well as a lateral envelope extending between said flat faces.
- connection means 3 consist of connection elements making it possible to electrically connect the surge arrester cell 2 constituted by the spark gap 2C, to the installation to be protected.
- the protection device 1 also comprises a thermal disconnection means 4, functionally connected to the unit 2 to interrupt the electrical connection between the unit 2 and the equipment to be protected when the temperature of the unit 2 reaches a predetermined critical value, beyond which the heat given off by the protection unit 2 risks damaging or burning the surrounding elements.
- the thermal disconnection means 4 is thus arranged relative to the protection unit 2 so as to be sensitive to the heat released by the latter, so as to be able to be triggered in the event of overheating to interrupt the flow of current.
- the device 1 also comprises a functional coupling means 5 of the protection unit 2 to the connection means 3.
- This functional coupling means 5 makes it possible to ensure the electrical connection of each of the poles 2A, 2B to the connection means 3, the latter being intended to be connected to the electrical installation, for example between neutral and earth.
- All of the aforementioned elements, namely the protection unit 2, the connection means 3, the thermal disconnection means 4 and the functional coupling means 5 are preferably mounted in a housing 1A (shown in FIG. 1), made of insulating material, to form a unitary one-piece sub-assembly.
- the functional coupling means 5 provides, in addition to its function of thermal connection of the unit 2 to the connection means 3, a function of holding said unit 2 in position in the housing 1A.
- the coupling means 5 is designed to exert a tightening of the protection unit 2, so as to ensure the electrical connection of said poles 2A, 2B to the connection means 3.
- the device 1 according to the invention achieves this coupling exclusively by applying an appropriate clamping force to the protection unit 2, without the use of welding.
- the only weld present in the device 1 will be that possibly corresponding to the thermal disconnection means.
- the presence of a single type of weld thus makes it possible to limit any risk of confusion during the manufacturing process, and thus promotes a good level of quality of the device according to the invention, at low cost.
- the general principle of the invention is therefore based on the replacement of a connection by welding with a “cold” assembly, obtained by the implementation of a clamping force preferably applied directly to the unit 2.
- the coupling means 5 is thus designed to apply a mechanical pinching or clipping stress on the protection unit 2 itself, this tightening allowing the electrical contact of the protection unit 2 and the connection means. 3. This tightening advantageously also ensures that the protection unit 2 is kept in position relative to the connection means 3 and to the housing 1 A.
- the coupling means 5 exerts, by virtue of its clamping action, both a function of electrical connection of the poles 2A, 2B to the connection means 3, and a function of holding in position (immobilization ) of the protection unit 2 in the housing 1A.
- the coupling means 5 is also designed to allow a removable coupling of the protection unit 2 to the connection means 3.
- the coupling means 5 authorizes the user to connect and disconnect to protection unit 2, simply and quickly, to the connection means 3.
- Such a technical arrangement allows easy repair of the device 1 in the event of failure of the protection unit 2 itself, since the invention allows the replacement substantially immediately and without the need for special tools (such as soldering iron and braid protection unit 2).
- the coupling means 5 comprises a first holding member 5A, arranged to bear against the first pole 2A, and a second holding member 5B, arranged to bear against the second pole 2B, the first and second holding members 5A, 5B cooperating to exert compression of the protection unit 2, preferably along the axis XX 'passing through its poles 2A, 2B.
- first and second holding members 5A, 5B cooperate to apply on each face 20A, 20B carrying the poles 2A, 2B of the spark gap 2C forces of identical intensities but in opposite directions, so that the spark gap is kept in position and in electrical contact with the connection means 3.
- the holding members 5A, 5B thus exert a pinching of the unit 2 along the axis XX ′, said pinching making it possible to ensure both an electrical connection and a mechanical holding.
- connection means 3 comprise on the one hand a first connector 3A, electrically connected to the first holding member 5A, which is made, at least partially, of a first electrically conductive material, and on the other hand a second connector 3B, electrically connected to the second holding member 5B, which is made, at least partially, of a second electrically conductive material.
- the second holding member 5B and the second connector 3B are formed by a single piece 50B, as shown in FIGS. 1 to 3.
- first holding member 5A and the first connector 3A are formed by a single piece.
- the thermal disconnection means 4 is thermally connected, in particular by conduction, to the second connector 3B and / or to the second holding member 5B.
- the second connector 3B and / or the second holding member 5B plays the role of conductor (s) of the thermal information coming from the unit 2 towards the thermal disconnection means 4.
- the first holding member 5A is functionally and structurally different from the second holding member 5B.
- first holding member 5A is more specifically dedicated to the generation of a positive clamping action of the unit 2, while the second holding member 5B is more specifically dedicated to the optimal transmission to the thermal disconnector 4 of any heat produced by unit 2.
- the first holding member 5A thus comprises a pressure piece 50A of the clip type, which is in the form of an elastic member whose deformation capacity produces, when it is stressed, a reactive force for setting in pressure.
- the pressure piece 50A is in the form of a spring leaf of U-shaped cross section, one of the arms 6 of the U bearing on the first connector 3A, while the other arm 7 bears against and on the first pole 2A, arms 6, 7 being connected by a core 51.
- the first material from which the pressure piece 50A is made will advantageously be chosen to have good elasticity characteristics.
- this first material could be based on a copper alloy.
- the second holding member 5B it preferably comprises a heat transmission part 50B, intended to communicate by conduction the heat emitted by the protection unit 2 by means of thermal disconnection 4.
- the heat transmission part 50B also forms a stop part for the unit 2, that is to say that the latter is pressed longitudinally along the axis XX 'by the pressure part 50A against the part. 50B stop, the latter preferably having a rigid character.
- the abutment piece 50B is shaped so that the contact interface between the protection unit 2 and said abutment piece 50B has a maximum area, as a function of the space constraints inherent in the design of the device 1, of so as to optimize the heat transfer by conduction between the unit 2 and the abutment piece 50B.
- the abutment piece 50B may advantageously have a planar support surface 8 of sufficient size to completely cover, according to a planar support, the face 20B of the unit 2 carrying the second pole 2B, as shown in Figures 1 and 2.
- the second material from which the abutment piece 50B is made will be chosen to have excellent thermal conductivity.
- this second material could be substantially pure copper.
- connection means 3 also comprise a third connector 3C, said first connector 3A and third connector 3C being intended to be electrically connected to the equipment to be protected.
- the thermal disconnection means 4 is designed to be capable of passing from a closed configuration (shown in the figures), in which it provides electrical contact between the second and third connectors 3B, 3C, to an open configuration , wherein said electrical contact between the second and third connectors 3B, 3C is broken.
- the thermal disconnection means 4 comprises a slider 4A, preferably having a rigid character, mounted with elastic axial sliding between a first return position, corresponding to the interruption of the electrical connection between the unit 2 and the equipment to be protected, and a second position in which the cursor 4A establishes electrical contact between the second and third connectors 3B, 3C, said cursor being kept immobilized in second position by a fusible means 4B, of the welding type.
- a slider 4A preferably having a rigid character, mounted with elastic axial sliding between a first return position, corresponding to the interruption of the electrical connection between the unit 2 and the equipment to be protected, and a second position in which the cursor 4A establishes electrical contact between the second and third connectors 3B, 3C, said cursor being kept immobilized in second position by a fusible means 4B, of the welding type.
- the slider 4A is preferably mounted with elastic axial sliding against a spring 9, for example compression.
- the cursor 4A also includes a scanning edge 4C which makes it possible to scrape the weld 4B when the cursor 4A moves from its second position to its first return position, so as to eliminate any residue of liquid weld which could establish a untimely connection between the second and third connectors 3B, 3C.
- the thermal disconnection means 4 allows the contact to be opened simultaneously at two points, namely at the second connector 3B and at the second connector 3C.
- the cut-off distance is therefore optimized, since it represents twice the distance traveled by the cursor 4A from its second to its first position.
- This technical arrangement is particularly advantageous in the case where the intensity of the current to be cut is in a high range (for example between 100 and 200 A in the case of a surge arrester for protecting the neutral line).
- the thermal disconnection means can implement, instead of a rigid cursor, a flexible conductive braid system, or even only a fusible means. It is also conceivable to use a thermal disconnection means which is exactly in the form of that illustrated in the figures, but which uses, instead of a fusible means as means for holding the cursor 4A in second position, a bimetallic strip arranged to deflect when the temperature reaches the predetermined critical value, this deflection causing the release of the cursor 4A.
- the protection unit 2 which in this case consists of a spark gap 2C, is inserted by force between the pressure clip 50A and the stop piece 50B.
- the first planar face 20A of the spark gap 2C pushes the arm 7 of the pressure piece towards the other arm 6.
- the arm 7 exerts a force against said face 20A, according to a substantially linear or pseudolinear support, said support being sufficient to ensure an adequate electrical connection of the spark gap 2C with the pressure piece 50A.
- the second planar face 20B comes into plane support against the bearing surface 8 of the stop piece 50B. This surface support makes it possible to optimize the heat transfer between the unit 2 and the abutment piece 50B.
- a clipping of the spark gap 2C is thus obtained. Said clipping simultaneously generates the electrical connection, the locking in position and the thermal connection of the spark gap 2C.
- the housing 1A is then closed, so that there is a unitary cartridge provided with two connection pins formed by the first and third connectors 3A, 3C.
- This cartridge is then connected to the electrical panel of the installation to be protected, for example between neutral and phase.
- the out-of-service 2C spark gap can be very easily replaced by a new spark gap, since it suffices to open the case 1A, to extract manually the used spark gap 2C, and to interpose the new spark gap between the pressure piece 50A and the stop piece 50B.
- the invention thus makes it possible to benefit from a modular surge arrester having excellent electrical and thermal connections of its protection unit 2 with the rest of the device 1, without the use of assembly welds.
- the invention finds its industrial application in the design, manufacture and use of protection devices against overvoltages, of the arrester type.
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Fuses (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/FR2003/003723 WO2005069457A1 (fr) | 2003-12-15 | 2003-12-15 | Dispositif de protection contre des surtensions a serrage |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1698029A1 true EP1698029A1 (fr) | 2006-09-06 |
EP1698029B1 EP1698029B1 (fr) | 2010-08-11 |
Family
ID=34778507
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03819272A Expired - Lifetime EP1698029B1 (fr) | 2003-12-15 | 2003-12-15 | Dispositif de protection contre des surtensions a serrage |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1698029B1 (fr) |
CN (1) | CN1894834B (fr) |
AT (1) | ATE477607T1 (fr) |
AU (1) | AU2003300611A1 (fr) |
DE (2) | DE60333804D1 (fr) |
PL (1) | PL213761B1 (fr) |
WO (1) | WO2005069457A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2959617B1 (fr) * | 2010-04-30 | 2012-05-11 | Abb France | Enveloppe de protection pour paratonnerre a dispositif d'amorcage |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2346095Y (zh) * | 1998-06-19 | 1999-10-27 | 江祥和 | 浪涌抑制管 |
FR2783365B1 (fr) * | 1998-09-15 | 2000-12-01 | Soule Materiel Electr | Dispositif de protection d'installations electriques contre les perturbations de l'alimentation |
DE10000617A1 (de) * | 2000-01-10 | 2001-07-12 | Abb Hochspannungstechnik Ag | Ueberspannungsableiter |
-
2003
- 2003-12-15 EP EP03819272A patent/EP1698029B1/fr not_active Expired - Lifetime
- 2003-12-15 DE DE60333804T patent/DE60333804D1/de not_active Expired - Lifetime
- 2003-12-15 WO PCT/FR2003/003723 patent/WO2005069457A1/fr active Application Filing
- 2003-12-15 DE DE20380358U patent/DE20380358U1/de not_active Expired - Lifetime
- 2003-12-15 AU AU2003300611A patent/AU2003300611A1/en not_active Abandoned
- 2003-12-15 PL PL380434A patent/PL213761B1/pl unknown
- 2003-12-15 CN CN2003801108282A patent/CN1894834B/zh not_active Expired - Lifetime
- 2003-12-15 AT AT03819272T patent/ATE477607T1/de not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2005069457A1 * |
Also Published As
Publication number | Publication date |
---|---|
PL213761B1 (pl) | 2013-04-30 |
PL380434A1 (pl) | 2007-01-22 |
WO2005069457A1 (fr) | 2005-07-28 |
AU2003300611A1 (en) | 2005-08-03 |
DE60333804D1 (de) | 2010-09-23 |
CN1894834A (zh) | 2007-01-10 |
EP1698029B1 (fr) | 2010-08-11 |
CN1894834B (zh) | 2010-04-28 |
ATE477607T1 (de) | 2010-08-15 |
DE20380358U1 (de) | 2006-10-12 |
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