EP2409202A1 - Appareil de commutation électrique - Google Patents

Appareil de commutation électrique

Info

Publication number
EP2409202A1
EP2409202A1 EP10753907A EP10753907A EP2409202A1 EP 2409202 A1 EP2409202 A1 EP 2409202A1 EP 10753907 A EP10753907 A EP 10753907A EP 10753907 A EP10753907 A EP 10753907A EP 2409202 A1 EP2409202 A1 EP 2409202A1
Authority
EP
European Patent Office
Prior art keywords
coil
magnetic field
auxiliary switches
current
structured
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
Application number
EP10753907A
Other languages
German (de)
English (en)
Other versions
EP2409202B1 (fr
EP2409202A4 (fr
Inventor
Patrick Wellington Mills
James Michael Mccormick
Kevin Francis Hanley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safran Electrical and Power USA LLC
Original Assignee
Eaton Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Eaton Corp filed Critical Eaton Corp
Publication of EP2409202A1 publication Critical patent/EP2409202A1/fr
Publication of EP2409202A4 publication Critical patent/EP2409202A4/fr
Application granted granted Critical
Publication of EP2409202B1 publication Critical patent/EP2409202B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/002—Monitoring or fail-safe circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
    • H01H47/04—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current
    • H01H2047/046—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current with measuring of the magnetic field, e.g. of the magnetic flux, for the control of coil current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/541—Auxiliary contact devices
    • 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
    • H01H71/123—Automatic release mechanisms with or without manual release using a solid-state trip unit

Definitions

  • the disclosed concept pertains generally to electrical switching apparatus and, more particularly, to electrical switching apparatus, such as, for example, relays, contactors or solenoid-actuated switches, including a coil and a number of auxiliary switches.
  • electrical switching apparatus such as, for example, relays, contactors or solenoid-actuated switches, including a coil and a number of auxiliary switches.
  • the disclosed concept also pertains to methods of controlling such electrical switching apparatus.
  • the disclosed concept further pertains to control systems for such electrical switching apparatus.
  • Figure 1 shows a conventional three-phase contactor 2 including three main contacts 4,6,8 controlled by a coil 10.
  • a number of sets of electromechanical auxiliary contacts 12 are responsive to the closed position or the open position of the three main contacts 4,6,8.
  • the contactor 2 employs two conductors, such as 14,16, for each set of the electromechanical auxiliary contacts 12.
  • the contactor 2 has a relatively large size and weight, includes individual mechanical adjustments (e.g., without limitation, an adjustment to provide "wear allowance" to ensure proper function as various parts wear).
  • each set of the electromechanical auxiliary contacts 12 requires adjustment to ensure that it is actuated when the main contacts 4,6,8 are actuated.
  • Each set of the electromechanical auxiliary contacts 12 includes an electromechanical auxiliary switch that provides the corresponding auxiliary contact function (e.g., normally closed (NC); normally open (NO)). While no power is required for NC auxiliary switches, the electromechanical auxiliary switches are susceptible to foreign object debris (FOD) and contaminates. There is room for improvement in electrical switching apparatus, such as relays, contactors or solenoid-actuated switches, including a coil and a number of auxiliary switches.
  • auxiliary contact function e.g., normally closed (NC); normally open (NO)
  • FOD foreign object debris
  • electrical switching apparatus such as relays, contactors or solenoid-actuated switches, including a coil and a number of auxiliary switches.
  • embodiments of the disclosed concept which monitor a magnetic field of a magnetic frame cooperating with a coil, detect a predetermined characteristic of a current flowing through the coil, and change a state of a number of auxiliary switches if the magnetic field is greater than a predetermined value and if the predetermined characteristic is detected.
  • a method controls an electrical switching apparatus including a coil, a magnetic frame cooperating with the coil, and a number of auxiliary switches.
  • the method comprises: monitoring a magnetic field of the magnetic frame; detecting a predetermined characteristic of a current flowing through the coil; and changing a state of the number of auxiliary switches if the magnetic field is greater than a predetermined value and if the predetermined characteristic is detected.
  • the method may further comprise reducing the current flowing through the coil; employing the predetermined value as a first predetermined value; employing a second predetermined value, which is smaller than the first predetermined value; and determining if the magnetic field decreases to less than the smaller second predetermined value and responsively changing the state of the number of auxiliary switches.
  • the method may further comprise employing a ferrous plunger with the coil; and detecting the predetermined characteristic of the current flowing through the coil when the ferrous plunger moves both far enough and fast enough responsive to the magnetic field.
  • the method may further comprise determining a magnitude of the current flowing through the coil; and adjusting the predetermined value as a function of the magnitude of the current.
  • a control system is for an electrical switching apparatus including a coil, a magnetic frame cooperating with the coil, and a number of auxiliary switches.
  • the control system comprises: a current sensor structured to sense a current flowing through the coil; a magnetic sensor structured to sense a magnetic field of the magnetic frame; and a circuit structured to detect a predetermined characteristic of the sensed current flowing through the coil and output a control signal responsive to the magnetic field being greater than a predetermined value and the predetermined characteristic being detected.
  • an electrical switching apparatus comprises: a coil; a magnetic frame cooperating with the coil; a number of separable contacts controlled by the coil; a number of auxiliary switches; a current sensor structured to sense a current flowing through the coil; a magnetic sensor structured to sense a magnetic field of the magnetic frame; and a circuit structured to detect a predetermined characteristic of the sensed current flowing through the coil and output a control signal responsive to the magnetic field being greater than a predetermined value and the predetermined characteristic being detected, wherein the control signal is structured to cause a change in state of the number of auxiliary switches.
  • the coil may include a ferrous plunger; the separable contacts may include a number of fixed contacts and a number of movable contacts movable by the ferrous plunger; and the current flowing through the coil may cooperate with the magnetic frame to cause the magnetic field to move the ferrous plunger from a first position wherein the separable contacts are open to a different second position wherein the number of movable contacts electrically engage the number of fixed contacts.
  • the circuit may be further structured to determine a magnitude of the current flowing through the coil and adjust the predetermined value as a function of the magnitude of the current.
  • the control signal may be structured to cause a change in state of the number of auxiliary switches to a first state when the magnetic field is greater than the predetermined value and the predetermined characteristic is detected;
  • the predetermined value may be a first predetermined value;
  • a second predetermined value may be smaller than the first predetermined value;
  • the circuit may be further structured to determine if the magnetic field is subsequently less than the smaller second predetermined value and to cause a further change in state of the number of auxiliary switches to a different second state.
  • Figure 1 is a block diagram of a contactor.
  • Figure 2 is a block diagram of a contactor including electronic auxiliary switches and actuation logic therefor in accordance with embodiments of the disclosed concept.
  • Figure 3 is a block diagram of a contactor including electronic auxiliary switches and actuation logic therefor in accordance with another embodiment of the disclosed concept.
  • Figure 4 includes plots of magnetic frame magnetic field, coil current and the state of the main contacts of a contactor or relay switch being switched to a first state in accordance with another embodiment of the disclosed concept.
  • Figure 5 includes plots of magnetic frame magnetic field, coil current and the state of the main contacts of a contactor or relay switch being switched to a second state with an abnormal result in accordance with another embodiment of the disclosed concept.
  • Figure 6 includes plots of magnetic frame magnetic field, coil current and the state of the main contacts of a contactor or relay switch being switched to a second state with a normal result in accordance with another embodiment of the disclosed concept.
  • Figure 7 is a block diagram in schematic form of the auxiliary switch actuation logic of Figure 2 and corresponding current and magnetic sensors in accordance with another embodiment of the disclosed concept.
  • Figure 8 is a cross section of a vertical elevation view of a relay in accordance with another embodiment of the disclosed concept.
  • Figure 9 is a block diagram in schematic form of the economizer and coil of Figure 2.
  • Figure 10 is a flowchart of a routine executed by the logic circuit of Figure 7. DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • number shall mean one or an integer greater than one (i.e., a plurality).
  • processor means a programmable analog and/or digital device that can store, retrieve, and process data; a computer; a workstation; a personal computer; a microprocessor; a microcontroller; a microcomputer; a central processing unit; a mainframe computer; a mini-computer; a server; a networked processor; or any suitable processing device or apparatus.
  • auxiliary switch means auxiliary contacts, an electromechanical auxiliary switch or an electronic auxiliary switch.
  • coil means a relay coil, a contactor coil or a solenoid coil.
  • the disclosed concept is described in association with three-phase relays and three-phase contactors having a plurality of electronic auxiliary switches, although the disclosed concept is applicable to a wide range of electrical switching apparatus including a coil, any number of phases, and any number of auxiliary switches, such as auxiliary contacts, electromechanical auxiliary switches or electronic auxiliary switches.
  • Example 1
  • FIG 2 shows a contactor 20 including a plurality of bi-directional electronic auxiliary switches 22 and actuation logic 24 therefor.
  • the example bidirectional electronic auxiliary switches 22 mimic electromechanical auxiliary switches, such as 12 of Figure 1.
  • a power input 26 provides power to activate any normally closed (NC) electronic auxiliary switches 22.
  • a control input 28 is provided to an economizer 30, which is discussed, below, in connection with Figure 9.
  • the economizer 30, in turn, controls a coil 54, which controls the main contacts 4,6,8 with a plunger 52.
  • the actuation logic 24 is discussed, below, in connection with Figures 7 and 10.
  • Figure 3 shows another contactor 40 including a plurality of electronic auxiliary switches 42 and actuation logic 44 therefor.
  • the example electronic auxiliary switches 42 mimic electromechanical auxiliary switches, such as 12 of Figure 1, except that a common and independent auxiliary switch ground 45 of power input 46 is employed to provide single-ended auxiliary outputs 43, in order to reduce external conductor count.
  • the independent auxiliary switch ground 45 preferably reduces EMI issues.
  • the electronic auxiliary switches 42 can employ any suitable relatively high or relatively low voltage logic, and corresponding power connections. For example, MOSFET or bipolar transistors (not shown) can be employed depending on individual auxiliary switch needs. High-side or low-side transistor circuits (not shown) can be employed.
  • the example contactor 40 employs switch-to-ground low side auxiliary switches 42 as shown in Figure 3.
  • example electronic auxiliary switches 22,42 of Figures 2 and 3 can be logic level switches and/or can control other relays within a system.
  • the electronic auxiliary switches 22,42 can drive up to about 1 A for logic level applications, while relay-type auxiliary switches can typically be rated up to about 10 A.
  • Figure 4 includes plots 60, 62 and 64 of magnetic frame magnetic field 66, coil current 68 and the state 70 (e.g., off or open is high; on or closed is low) of the main contacts (see 4,6,8 of Figure 2) of an electrical switching apparatus, such as a contactor or relay switch, being switched to a first state (e.g., off), respectively.
  • a contactor or relay switch such as a contactor or relay switch
  • Figure 5 includes plots 80, 82 and 84 of magnetic frame magnetic field
  • coil current 88 increases to a final value 92 that is a function of the coil resistance; however, the wave shape of the increasing coil current 88 is influenced by several factors.
  • the coil current 88 still reaches the full inrush value 92 (e.g., based on the coil resistance) (e.g., without limitation, about 3.1 A at 25 0 C), because the plunger did not seat, there is an air gap that limits the final value 96 of the magnetic field 86. As a result, the state 90 remains high corresponding to the open or off state of the main contacts.
  • the full inrush value 92 e.g., based on the coil resistance
  • a control method to change the state of the auxiliary switches 22,42 includes: (1) determining if the glitch 94 ( Figure 6) is present; and (2) determining if the magnetic field strength 96,96' is sufficient; and (3) creating a control signal 27,47
  • Figure 6 includes plots 100,102,104 of magnetic frame magnetic field 106, coil current 108 and the state 110 of the main contacts (see 4,6,8 of Figure 2) being switched to a second state (e.g., on), respectively, with a normal result.
  • the "glitch” 94 is detected. This detection is ANDed with the detection of the magnetic field strength signal 96' being over the threshold 112. As is shown in Figure 5, the "glitch” 94 is not present in area 94' when, for example, the plunger (not shown, but see plunger 52 of Figures 7 and 8) is stalled.
  • a coil current value 113 is detected with a suitable sensor (e.g., without limitation, a Hall sensor 114 ( Figure 7)).
  • This current value 113 can be used, as will be explained, to set or adjust the threshold 112 for the magnetic field strength 86,106.
  • the threshold 112 of the magnetic field strength 86,106 can be determined using the coil current value 113, as is discussed in Examples 4, 9 and 10, below.
  • One of the variables controlling the final magnetic field strength 96,96' in the magnetic frame is the final magnitude 92,113 of the current 88,108.
  • the magnitude of the current 88,108 varies with temperature inversely.
  • the magnitude 92,113 of the coil current 88,108 can be employed to set this threshold for such magnetic field strength.
  • control logic e.g., an algorithm
  • This control logic includes: (1) determining if the magnetic field 66,106 in the magnetic frame 50 decreases below a different predefined threshold (e.g., without limitation, smaller than the threshold 112; determined empirically; adjusted for ambient temperature, coil current and/or coil voltage) (see, for example, 74 of Figure 4) known to be less than that needed to maintain contact closure; and (2) providing the control signal 27,47 to command the auxiliary switches 22,42 to revert to their original state.
  • a different predefined threshold e.g., without limitation, smaller than the threshold 112; determined empirically; adjusted for ambient temperature, coil current and/or coil voltage
  • Example 6 Figure 7 shows the auxiliary switch actuation logic 24 of Figure 2, the corresponding current sensor 114 structured to sense current flowing through the coil 54, and the corresponding magnetic field sensor 120 structured to sense the magnetic field 106 ( Figure 6) of the magnetic frame 50.
  • the actuation logic 44 of Figure 3 can be the same as or similar to the actuation logic 24.
  • Both of the actuation logics 24,44 can be implemented with a suitable processor, such as for example and without limitation, a microcontroller or microcomputer including a suitable analog to digital converter 122.
  • the actuation logic 24 and sensors 114,120 provide a control system (control circuit) to control the auxiliary switches 22,42 for an electrical switching apparatus based on the sensed magnetic field 124 of the magnetic frame 50 and the sensed current 126 flowing through the coil 54.
  • This control system monitors and detects the strength of the magnetic field in the magnetic frame 50 and detects the "glitch" characteristic 94 of the coil current waveform.
  • a relay 130 (portions of which are shown in Figure 8) includes a positive electrical terminal 132 and a negative electrical terminal 134, which input a single actuation signal (e.g., without limitation, 28 VDC; any suitable DC voltage).
  • the actuation logic 24 outputs the electronic auxiliary switch control signal 27, which is structured to change the state of the auxiliary switches 22,42 ( Figures 2 and 3).
  • the magnetic field sensor 120 is preferably sensitive to the full range of the magnetic strength present during the operation of the coil 54.
  • the actuation logic 24 is structured to detect a predetermined characteristic, such as the glitch 94 of the sensed current 126 flowing through the coil 54, and output the control signal 27 responsive to the sensed magnetic field 124 being greater than the threshold 112 ( Figure 6) and the predetermined characteristic being detected.
  • an electrical switching apparatus e.g., without limitation, such as the example relay 130; a contactor; a solenoid-actuated electrical switch
  • the coil 54 also shown in Figure 9
  • the magnetic frame 50 cooperating with the coil 54
  • a number of separable contacts 137 not fully shown, but see the main contacts 4,6,8 of Figure 2
  • auxiliary switches 136 e.g., auxiliary switches 22,42 of Figures 2 or 3
  • the current sensor 114 Figure 7) structured to sense the current flowing through the coil 54
  • the magnetic sensor 120 structured to sense the magnetic field of the magnetic frame 50
  • a circuit such as 24, and the economizer 30.
  • the relay 130 functions as a coil-actuated (e.g., solenoid-actuated) electrical switch in which the magnetic field generated by an electromagnet formed by the coil 54 and the magnetic frame 50 causes the axial ferrous plunger 52 to move from a rest position (e.g., up with respect to Figures 7 and 8) to an energized position (e.g., down with respect to Figures 7 and 8) when the coil 54 is suitably energized.
  • the predetermined characteristic e.g., glitch 94
  • the actuation logic 24 detects this predetermined characteristic when the ferrous plunger 52 moves both far enough and fast enough responsive to the magnetic field.
  • the separable contacts 137 (not fully shown, but see the main contacts 4,6,8 of Figure T), which are coupled to the plunger 52, can be moved from a rest position to an energized position.
  • the separable contacts 137 can include a number of fixed contacts 138 and a number of movable contacts 140 (also shown in Figure 8) movable by the ferrous plunger 52.
  • the current flowing through the coil 54 cooperates with the magnetic frame 50 to cause the magnetic field to move the ferrous plunger 52 from a first position (e.g., up with respect to Figures 7 and 8) wherein the separable contacts 137 are open to a different second position (e.g., down with respect to Figures 7 and 8) wherein the number of movable contacts 140 electrically engage the number of fixed contacts 138.
  • the separable contacts 137 can switch any suitable voltage (e.g., AC; DC). Although three sets of separable contacts 137 are shown, any suitable number can be employed. In the example of Figure 2, the three sets of movable contacts 140 are driven by the plunger 52 of the coil 54.
  • the example relay 130 also includes a cover (not shown), a printed circuit board (PCB) 142 including the electronic auxiliary contacts 136, a PCB 144 including the actuating logic 24 and the economizer 30, a base 146, and a plurality of terminals 148 in electrical communication with the fixed contacts 138 of Figure 2 (only three of six terminals 148 are shown).
  • a terminal 150 provides the power input 26 ( Figure 2) to activate any NC electronic auxiliary switches 22.
  • the terminals 132,134 provide power to the economizer 30 and the PCB 144 as shown in Figure 7.
  • the terminals 132,134,150 can be employed as part of a common connector. Power terminals, such as 148, typically include bus bars (not shown) or threaded stud terminals (not shown) for external electrical connections.
  • Example 8 Figure 9 shows the economizer 30 and coil 54 of Figure 2.
  • the economizer 30 is a conventional coil relay/contactor control circuit that allows for a relatively much greater magnetic field in an electrical switching apparatus during, for instance, the initial (e.g., without limitation, 50 mS) time following application of power to ensure that the plunger 52 completes it travel and overcomes its own inertia, friction and spring forces. This is achieved by using a dual coil arrangement in which there is a suitable relatively low resistance circuit or coil 160 and a suitable relatively high resistance circuit or coil 162 in series with the coil 160. Initially, the economizer 30 allows current to flow through the low resistance circuit 160, but after a suitable time period, the economizer 30 turns off the low resistance path.
  • the dual bifilar coil 54 is employed inside the magnetic frame 50.
  • the RC timing components 164 control the inrush time period.
  • the coil 160 is, for example and without limitation, 9 ohms and the coil 162 is, for example and without limitation, 90 ohms.
  • the FET 166 provides a coil current shunt path to dramatically increase current through the coil 160 during the initial period after the application of power.
  • the coil 160 creates a relatively very strong magnetic field even though no appreciable current flows through the other coil 162 during this time.
  • Magnetic field strength is a function of the product of the coil current and the number of turns of the corresponding coil(s) 160,162.
  • the control logic 170 turns FET 166 off, the shunt path is no longer present, and the coil current now flows through both of the coils 160,162.
  • the coil design is such that the coil current creates enough magnetic force to hold the electrical switching apparatus in the energized state. In this case, the current would be reduced to (e.g., without limitation, 28 VDC / (9 + 90 ohms) or about 0.28 A), which is fewer amps, but with many more turns of the coils 160,162.
  • Example 9 Figure 10 shows a routine 180 executed by the actuation logic 24 of
  • FIG. 7 Initially, at 182, the control input 28 (control voltage) ( Figure 2) is applied between the electrical terminals 132,134. Next, at 184, the coil economizer 30 and actuation logic circuit 24 are activated, and the actuation logic circuit 24 begins to monitor the coil current for the glitch 94 ( Figure 6). Then, at 186, it is determined if the inrush current glitch 94 is present. If not, then at 188, the state of the auxiliary switches 22 ( Figure 2) is not changed (e.g., maintain the normally open auxiliary switches and the normally closed auxiliary switches in their prior states).
  • the magnetic field strength is within acceptable limits (e.g., above a suitable predetermined value (threshold 112 of Figure 6); above a suitable empirically determined value; above a value from a look-up table as a function of a suitable predetermined value, ambient temperature, voltage and/or current), then, at 192, the normally open auxiliary switches are activated and the normally closed auxiliary switches are de-activated by changing the state of the control signal 27 ( Figure 2). Otherwise, at 194, the state of the auxiliary switches 22 ( Figure 2) is not changed (the state of the control signal 27 is not changed).
  • acceptable limits e.g., above a suitable predetermined value (threshold 112 of Figure 6); above a suitable empirically determined value; above a value from a look-up table as a function of a suitable predetermined value, ambient temperature, voltage and/or current
  • the routine 180 monitors the magnetic field of the magnetic frame 50, detects the predetermined characteristic of the current flowing through the coil 54, and changes the state of the number of auxiliary switches 22,42 if the sensed magnetic field 124 is greater than the predetermined value (threshold 112) and if the predetermined characteristic 94 is detected.
  • the magnetic field of the magnetic frame 50 is preferably characterized throughout the voltage/temperature range of the corresponding electrical switching apparatus. For example, as a typical contactor or relay is energized, the magnetic field is changing.
  • the magnetic field in the magnetic frame 50 is influenced by the amount of coil current flowing and the effect of position and movement of the plunger 52. Copper resistance (R) varies dramatically with temperature (T), therefore, the current that flows through the coil 54 varies as a function of temperature as shown in Equation 1.
  • TO is the initial temperature ( 0 C); and ⁇ is the temperature coefficient of the material (e.g., ⁇ for copper is 3.9 x l0 "10 /°C).
  • the force on the plunger 52 when it is energized is changed resulting in more or less acceleration of the plunger 52 from its de-energized position to its energized position.
  • the energized state is defined by the completion of transfer of position of the plunger 52 and the separable contacts 137 coming to rest in the transferred (e.g., closed) position.
  • the coil current 108 ( Figure 6) continues to increase for a brief period of time as a result of the inductance of the coil 54.
  • the magnetic field in the magnetic frame 50 is in a dynamic state until this time and it is different from apparatus to apparatus depending on temperature and variations in spring and friction forces.
  • a suitable adjustment of the predetermined value can be made as a function of the magnitude of the coil current.
  • the actuation logic circuit 24 can control auxiliary switches 22,42 to change their proper state according to the determined position of the plunger 52.
  • the disclosed concept employs a single control input 28 (single actuation signal) ( Figure 2).
  • This can employ electronic auxiliary switches 22,42 ( Figures 2 and 3) and, thus, avoid the need for multiple mechanical adjustments.
  • This provides reduced size and weight, is not susceptible to FOD or contaminants, and improves reliability and life expectancy of the electrical switching apparatus.
  • the example electronic auxiliary switches 42 potentially reduce aircraft conductor count.

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Abstract

La présente invention concerne un appareil de commutation électrique (130) qui comprend une bobine (54), un support magnétique (50) coopérant avec la bobine, un nombre donné de contacts séparables (137) commandés par la bobine, un nombre donné de commutateurs auxiliaires (22), un capteur de courant (114) structuré pour détecter un courant (108) circulant dans la bobine, et un capteur magnétique (120) structuré pour détecter un champ magnétique (66, 106) du support magnétique. Un circuit (24) est structuré (180) pour détecter une caractéristique prédéfinie (94) du courant détecté (126) circulant dans la bobine et pour émettre un signal de commande (27) en réponse au champ magnétique supérieur à une valeur prédéfinie (112) et à la caractéristique prédéfinie en cours de détection. Le signal de commande est structuré pour entraîner un changement d'état du nombre donné de commutateurs auxiliaires.
EP10753907.4A 2009-03-16 2010-03-11 Appareil de commutation électrique Active EP2409202B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16042109P 2009-03-16 2009-03-16
PCT/US2010/026992 WO2010107655A1 (fr) 2009-03-16 2010-03-11 Appareil de commutation électrique

Publications (3)

Publication Number Publication Date
EP2409202A1 true EP2409202A1 (fr) 2012-01-25
EP2409202A4 EP2409202A4 (fr) 2018-01-17
EP2409202B1 EP2409202B1 (fr) 2019-09-18

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EP10753907.4A Active EP2409202B1 (fr) 2009-03-16 2010-03-11 Appareil de commutation électrique

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EP (1) EP2409202B1 (fr)
CN (1) CN102428417B (fr)
BR (1) BRPI1006240B1 (fr)
WO (1) WO2010107655A1 (fr)

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GB2567894A (en) * 2017-10-31 2019-05-01 Elaut Nv Improvements to the operation of electromagnetic actuators
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Also Published As

Publication number Publication date
EP2409202B1 (fr) 2019-09-18
WO2010107655A1 (fr) 2010-09-23
WO2010107655A9 (fr) 2011-04-21
BRPI1006240B1 (pt) 2020-09-15
CN102428417B (zh) 2014-03-12
CN102428417A (zh) 2012-04-25
EP2409202A4 (fr) 2018-01-17

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