EP3218917A1 - Actionneur électromagnétique à bobines multiples - Google Patents
Actionneur électromagnétique à bobines multiplesInfo
- Publication number
- EP3218917A1 EP3218917A1 EP15804888.4A EP15804888A EP3218917A1 EP 3218917 A1 EP3218917 A1 EP 3218917A1 EP 15804888 A EP15804888 A EP 15804888A EP 3218917 A1 EP3218917 A1 EP 3218917A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil
- differential
- magnetic field
- magnetic
- current
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection
- H01H83/144—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection with differential transformer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
- H01H71/30—Electromagnetic mechanisms having additional short-circuited winding
Definitions
- the present invention relates to an electromagnetic actuator whose immunity to electric shock has been enhanced. It relates in particular electromechanical actuators which are used in combination with trigger locks of electrical line protection devices, for example differential devices and / or disjunction dependent on the mains voltage.
- An actuator conventionally comprises coils surrounding a movable magnetic core capable of moving from a rest position to an actuating position under the effect of the magnetic field created by the coils. More precisely, it includes:
- magnetic coil generating a magnetic field in response to a fault of the short-circuit type on the current line to be protected.
- the problem to be solved by this invention is as follows: the circuits protected by electrical appliances such as those mentioned before are tested and are subjected to electromagnetic compatibility (EMC) tests, to check whether they are sufficiently immunized against disturbances from other equipment, or more generally from the environment.
- EMC electromagnetic compatibility
- Such an actuator it is customary for such an actuator to be controlled by a control element, for example a thyristor, itself activated when the detection circuit of the device detects a fault.
- a varistor protects the control element in the event of an overvoltage wave as a 1.2 / 50 ⁇ 8 voltage wave. This varistor, placed downstream of the differential coil, becomes conductive beyond a defined voltage threshold and thus makes it possible to limit the voltage across the control element to a value lower than the breakdown voltage of the control element.
- a current solution consists in placing an additional varistor at the terminals of the differential coil.
- This solution makes it possible to avoid breakdowns in current wave 8 / 20 ⁇ 8, but has the disadvantage of increasing the voltage (of the order of 1000V) at the terminals of the control element during a voltage wave 1, 2 / 50 ⁇ 8 because of the very strong current (of the order of 1000A) drained by the two varistors in series.
- the control element so as not to degrade prematurely, must be able to withstand such a voltage. It will therefore consist, for example, of a 1200V thyristor or an IGBT, that is to say a relatively expensive component.
- the manufacture of such an electromagnetic actuator will also be simple to implement and inexpensive.
- the electromagnetic actuator according to the invention comprises, in a conventional manner:
- a magnetic coil nested with the differential coil, and generating a magnetic field in response to a short circuit-type fault on the current line to be protected.
- This actuator is characterized principally in that it also comprises a third coil interleaved with said differential and magnetic coils, traversed by a current whose direction is inverted with respect to that of the differential coil when a current flows between the phase and the neutral of the actuator, and generating a magnetic field opposite to the magnetic field created by the differential coil, said third coil being connected in parallel with the differential coil, between the phase Ph and the neutral N of the line to be protected, and driven by control means.
- said control means consist of a varistor voltage-controlled component, added in series downstream of the third coil, between the phase Ph and the neutral N of the line to be protected.
- This component makes it possible to allow or not the third coil to be traversed by current depending on a voltage threshold depending on the component itself. Without the existence of such a component, the third coil would be permanently traversed by current, and either burn or trigger permanently.
- the two varistors (the one downstream of the differential coil, and the one downstream of the third coil) become conducting simultaneously since the voltage threshold is exceeded, and the coil differential and the third coil are then traversed by current.
- the current flowing in the third coil creates a magnetic field that opposes that created by the differential coil, thereby inhibiting the magnetic force exerted on the movable magnetic core of the electromagnetic actuator.
- This configuration thus makes it possible to suppress unwanted tripping and hardware impairments related to 1.2 / 50 ⁇ 8 voltage waves up to 4000V.
- the magnetic coil when traversed by an 8 / 20 ⁇ 8 current wave, it generates a magnetic field.
- the third coil captures this magnetic field by its positioning in the vicinity of the magnetic coil, and naturally created, by magnetic coupling, an induced current which passes through it in the opposite direction to the current flowing in the magnetic coil.
- This induced current then creates a magnetic field that opposes that created by the magnetic coil.
- the resulting magnetic field is significantly lower than that initially created by the magnetic coil, which reduces the voltage induced on the differential coil.
- This configuration makes it possible to avoid the breakdowns caused by the 8 / 20 ⁇ 8 current waves.
- the downstream components i.e. the terminal varistor of the control element and the control element, can be selected in a lower range and therefore less expensive.
- the invention is therefore partly based on the fact that the three coils are located in the same defined space in order to have a magnetic coupling between them.
- the three coils can even be coaxial in order to simplify their winding and their positioning within the actuator. This configuration ensures a maximum compactness of the actuator.
- the invention also protects an electrical line protection apparatus comprising an electromagnetic actuator as described above.
- FIG. 1 represents an electrical diagram of an actuator according to a first configuration of the invention
- FIG. 2 illustrates an actuator electrical diagram according to a second configuration of the invention.
- the actuator of the invention as illustrated in FIGS. 1 and 2 comprises a magnetic coil (1) and a differential coil (2) connected in parallel with the protected line, that is to say typically between phase Ph and Neutral N. This actuator is typically placed upstream of a load on the line to be protected.
- These coils (1, 2) surround a movable magnetic core (not shown) capable of moving from a rest position to an actuating position under the effect of the magnetic field created by the coils (1, 2)
- This actuator is controlled by a control element (5), a thyristor in this case, itself activated when the detection circuit (not shown) of the device detects a fault.
- This thyristor (5) is placed downstream of the differential coil (2) between the phase Ph and the neutral N.
- this actuator further comprises a third coil (3) whose winding direction is inverted with respect to that of the differential coil (2), as illustrated by the two arrows.
- this actuator further comprises a third coil (3) having a winding direction identical to that of the differential coil (2), but which is positioned upside down with respect to the differential coil (2). ).
- these two coils (3, 2) are turned relative to each other.
- the beginning end (11) of the third coil (3) is found in the vicinity of the end end (10) of the differential coil (2), and the end end (9) of the third coil (3) is in the vicinity of the start end (8) of the differential coil (2).
- the three coils (1, 2, 3) are separated from each other in FIG. 1 for the sake of clarity, but are actually nested within each other so as to generate a magnetic coupling.
- the coil (3) by this magnetic coupling, will always generate a magnetic field opposite to the field generated by the magnetic coil (1), in particular during an 8 / 20 ⁇ 8 current wave. As a result, the voltage across the differential coil (2) is reduced, thereby avoiding dielectric breakdowns and deterioration of the adjacent varistor and thyristor.
- An additional varistor (6) is added downstream of the third coil (3) so that the latter is not permanently powered.
- the varistors (4, 6) become simultaneously conducting, and the coils (2, 3) are then traversed by current.
- the current flowing in the third coil (3) creates a magnetic field that opposes that created in the differential coil (2) since the winding directions are reversed.
- the magnetic field generated by the differential coil is in the same direction as that generated by the magnetic coil.
- the opposite might be possible, It is a condition to delay the differential function in order to allow the magnetic coil time to trigger the product because there could be interference between the two coils (magnetic and differential) in the event of simultaneous operation.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnets (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
- Synchronous Machinery (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1460980A FR3028663B1 (fr) | 2014-11-14 | 2014-11-14 | Actionneur electromagnetique a bobines multiples |
| PCT/FR2015/053040 WO2016075404A1 (fr) | 2014-11-14 | 2015-11-10 | Actionneur électromagnétique a bobines multiples |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3218917A1 true EP3218917A1 (fr) | 2017-09-20 |
| EP3218917B1 EP3218917B1 (fr) | 2019-01-02 |
Family
ID=52988131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP15804888.4A Active EP3218917B1 (fr) | 2014-11-14 | 2015-11-10 | Actionneur électromagnétique à bobines multiples |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP3218917B1 (fr) |
| CN (1) | CN107148660B (fr) |
| AU (1) | AU2015344911B2 (fr) |
| FR (1) | FR3028663B1 (fr) |
| WO (1) | WO2016075404A1 (fr) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE531282C (de) * | 1931-08-08 | Voigt & Haeffner Akt Ges | UEberstrommagnet mit einer kurzgeschlossenen Daempferwicklung fuer elektrische Schalter, die Netze mit periodisch schwankendem Gleichstrom ueberwachen | |
| FR2779568B1 (fr) * | 1998-06-04 | 2000-07-13 | Schneider Electric Ind Sa | Dispositif de coupure electrique comprenant un dispositif de declenchement differentiel et disjoncteur comprenant un tel dispositif |
| US7128032B2 (en) * | 2004-03-26 | 2006-10-31 | Bose Corporation | Electromagnetic actuator and control |
| FR2919421B1 (fr) * | 2007-07-23 | 2018-02-16 | Schneider Electric Industries Sas | Actionneur electromagnetique a au moins deux bobinages |
| FR2969369A1 (fr) * | 2010-12-20 | 2012-06-22 | Schneider Electric Ind Sas | Appareil de protection electrique comportant la fonction de protection differentielle |
| FR2974662B1 (fr) * | 2011-04-29 | 2016-04-15 | Hager Electro Sas | Actionneur electromagnetique a generateur magnetique |
-
2014
- 2014-11-14 FR FR1460980A patent/FR3028663B1/fr not_active Expired - Fee Related
-
2015
- 2015-11-10 WO PCT/FR2015/053040 patent/WO2016075404A1/fr not_active Ceased
- 2015-11-10 AU AU2015344911A patent/AU2015344911B2/en active Active
- 2015-11-10 CN CN201580061030.6A patent/CN107148660B/zh active Active
- 2015-11-10 EP EP15804888.4A patent/EP3218917B1/fr active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2016075404A1 (fr) | 2016-05-19 |
| AU2015344911B2 (en) | 2020-03-19 |
| FR3028663B1 (fr) | 2016-12-16 |
| AU2015344911A1 (en) | 2017-06-01 |
| EP3218917B1 (fr) | 2019-01-02 |
| CN107148660B (zh) | 2019-05-28 |
| CN107148660A (zh) | 2017-09-08 |
| FR3028663A1 (fr) | 2016-05-20 |
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