EP2637193A1 - Motor-driven re-closing device - Google Patents

Abstract

The apparatus has an electric motor (40) comprising a motor shaft (41), which is operatively connected to an operating shaft (12) of an electrical switching device (10.1) by a switching linkage i.e. connecting rod. The switching linkage comprises a coupling element (30) by which the motor shaft is connected to the operating shaft. The switching linkage is designed such that the switching device is switched over from an OFF position to an ON position by rotation of the motor shaft. The coupling element is linked at the operating shaft over single-arm levers.

Description

The invention relates to a motor-driven reclosing device for drehbetätigbare switching devices.

Technical field and state of the art

There are various motorized input and switching devices known. For example, the shows DE 9203532 U1 a mechanical switching or remote drive for electrical switching devices with rotary or rocker arm drive for the switch lock, wherein at least one additional mechanical rotary drive is provided which is mechanically connected to the rotary drive on an adjacent switching device by tension elements in the form of two Bowden cables.

The invention has for its object to provide a reclosing device that works easily and is easy to grow on or on the operating side of one or more switching devices.

The object is achieved according to the invention essentially by the features of claim 1, while in the dependent claims particularly advantageous developments of the invention are characterized. The use of the invention is also claimed.

The essence of the invention relates to a motor drive for attachment to at least one electrical switching device, in particular to a low-voltage circuit breaker or the like, wherein the switching device via a hand knob and an actuating shaft in the ON and OFF position is drehbetätigbar. With the rotary actuator, which is preferably designed to 90 °, the at least one switching device can be switched manually or by means of motor drive from an OFF position to an ON position.

• ● der Motorantrieb umfasst einen Elektromotor mit Motorwelle,
• ● die Motorwelle ist über ein Schaltgestänge mit der Betätigungswelle mindestens eines Schaltgeräts in Wirkverbindung bringbar,
• ● der Elektromotor ist über einen (entfernt angeordneten) Schalter in Drehbewegung setzbar.

At least further elements and details of the arrangement according to the invention are present:

• ● the motor drive comprises an electric motor with motor shaft,
• ● The motor shaft can be brought into operative connection with the actuating shaft of at least one switching device via a shift linkage.
• ● The electric motor can be set in rotary motion via a (remote) switch.

The arrangement according to the invention is used to reconnect switching devices remotely after intentional or unwanted shutdown by simple contact.

• ● das oder die Schaltgeräte bleiben zusätzlich handschaltbar;
• ● Parallelantrieb für mehr als ein Schaltgerät;
• ● sofortige Wiedereinschaltmöglichkeit;
• ● einfache Versorgung über Netzspannung;
• ● die Einschaltzeit ist kürzer als 1 sec.;
• ● Ausschaltvorgang ohne Fremdspannung;
• ● anbaubar an unterschiedliche Schaltgeräte, beispielsweise für Motorschutzschalter im industriellen Umfeld oder an Schutzschalter für PV-Anlagen.

Particular features and advantages of the arrangement according to the invention:

• ● the switching device or devices remain manually switchable;
• ● Parallel drive for more than one switching device;
• ● immediate reclosing option;
• ● easy supply via mains voltage;
• ● the switch-on time is shorter than 1 sec .;
• ● Switch-off process without external voltage;
• ● Can be mounted on various switchgear, for example for motor-protective circuit-breakers in industrial environments or on circuit breakers for PV systems.

The motor drive is attachable to one or more switching devices, with a rotary actuation of 90 °, the one or more switching devices from an OFF position to an ON position can be switched. The shift linkage comprises one or two parallel coupling elements, which are articulated between arranged on the operating shafts of one or two switching devices Doppelarmigen levers.

The motor drive can be arranged next to one another in addition to one or more switching devices that actuator shaft and motor shaft are parallel.

The actuating mechanism consists of a shift linkage with one or two coupling elements. The first coupling element is on the actuating shaft via a articulated lever one arm. Two coupling elements are parallel and engage the ends of attached to the operating shafts of the switching devices Doppelarmhebel.

The shift linkage comprises a crank arranged on the motor shaft, which engages via a pull rod to a driver attached to the first coupling element.

Parallel to the at least one switching device is an electric motor whose motor shaft is arranged parallel to the actuating shafts. The electric motor can be supplied with low voltage, for example with 12 V and energized via a remote switch. The switch-on signal can be given by a potential-free contact to the motor drive from the outside. A crank is attached to the motor shaft. The crank of the electric motor and the Einarm- or Doppelarmhebel move in two mutually parallel planes. In ON operation, the motor gear shaft performs one revolution. A shutdown of the electric motor via an actuation of a moving of the motor shaft switching cam via a microswitch.

The drawbar is stored at one end at the end of the crank. At the other end, the pull rod is connected via a bearing with a sliding block running on the first coupling element. The pull rod is arranged at one end at the end of the crank and the other end mounted on a sliding on the first coupling element sliding block. In the OFF position of the switching devices or the arranged on the first coupling element driver is located in a position with the greatest distance to the motor shaft. The sliding block engages over drivers attached to the coupling element.

During one revolution of the crank, the pull rod performs a linear movement and the sliding block slides back and forth over a path on the first coupling element.

The actuating mechanism formed as a shift linkage can be accommodated in a mountable prismatic housing, which can be attached with its housing underside facing the front side / operating side of the at least one switching device.

Preferably, the use of the reclosing device according to the invention may be provided for at least one circuit breaker, which can be switched off via working current or undervoltage release. Each switching device is connected via connectors Electricity connected. Each current path supplies, for example, a consumer. If safety applications do not prevail where zero-voltage safety is required, a circuit-breaker with shunt release can be used.

If the switch-off is fail-safe by means of an undervoltage release, it is perfectly sufficient to connect the motor-driven reclosing device to mains voltage. In the electrical wiring, a simple self-locking can be used with a relay that controls the electric motor.

The use and application of the arrangement according to the invention can be particularly advantageous when used for facilities that are difficult to access. For example, in the industrial environment in the field of motor protection switch. Thus, in unoccupied pumping stations in wastewater stations somewhere in the field, which are not constantly occupied, damage can be caused by prolonged shutdown of the pump.

The switch-on command can be given via a remote, external button. The connection is then made by closing a contact. The transmission of the reclosing command can also be wireless. This can e.g. with the help of a radio system.

A preferred use of the reclosing device is proposed for a DC load-break switch, which is connected in photovoltaic systems between photovoltaic modules and inverters.

Such a DC switch-disconnector (for up to 32 A rated current) is known as a so-called fire station switch ( DE 10 2008014129 B4 ). With this circuit breaker, the direct current path to the inverter (by means of an undervoltage release) can be switched off for photovoltaic systems. The circuit breaker is preferably mounted in the immediate vicinity of PV modules in order to minimize the lengths of cables between PV modules and circuit breakers as short as possible. Frequently, however, the spatial accessibility of the circuit breaker is made more difficult.

If the entire house is disconnected from the mains supply in an emergency (eg fire), this automatically triggers the circuit breaker and thus the circuit breaker Voltage release of the PV-DC cables. A risk to the use and extinguishing forces due to live DC cables is thus excluded.

The disadvantage is that undervoltage releases also respond to power failures that are common, e.g. during thunderstorms or network faults. The circuit breaker opens the contacts and remains open. After intentional or unintentional disconnection, it was hitherto cumbersome to switch the PV system on remotely. The consequence of this is that the inverter does not receive any DC voltage and does not supply energy to the grid. Failures of the feed-in tariff are the result. So far, the circuit breaker at the installation site by hand must be turned on again.

After the danger has been remedied and the mains voltage has returned, a switch-on signal (manual or automatic) can be given to the reclosing device. The contacts are closed, the supply of the inverter with DC voltage is restored and the energy supply to the grid is resumed.

Brief description of the drawings

The figures show embodiments of preferred arrangements according to the invention.

• Figur 1: eine Aufsicht auf das Schaltgestänge bei Schalterstellung AUS;
• Figur 2: eine perspektivische Aufsicht auf das Schaltgestänge bei Schalterstellung EIN;
• Figur 3A: Detail Schaltgestänge bei Schalterstellung AUS und
• Figur 3B: Bewegung des Schaltgestänges in Richtung EIN.

Further details and advantages of the invention will become apparent from the following, with reference to figures explained embodiments. Show it

• FIG. 1 : a view of the shift linkage with switch position OFF;
• FIG. 2 : a perspective view of the shift linkage when switch ON;
• FIG. 3A : Detail shift linkage with switch position OFF and
• FIG. 3B : Movement of the shift linkage in the direction of ON.

In Fig. 1 a first embodiment is shown schematically, which comprises the following elements and details, wherein the reclosing device is attachable to at least one electrical switching device 10.1, on the actuating shaft 12, a one-armed lever 15 is arranged.

• einen Motorantrieb mit einem Elektromotor 40 und dessen Motorwelle 41,
• der Elektromotor 40 ist gegenüber dem Schaltgerät 10. 1 derart anordbar, dass die Betätigungswelle 12 und die Motorwelle 41 parallel liegen;
• über ein Schaltgestänge lässt sich die Motorwelle 41 mit der Betätigungswelle 12 des Schaltgeräts 10.1 in Wirkverbindung bringen,
• wobei das Schaltgestänge ein (erstes) Koppelelement 30 umfasst, das die Motorwelle 41 mit der Betätigungswelle 12 verbindet.

The first embodiment comprises at least:

• a motor drive with an electric motor 40 and its motor shaft 41,
• the electric motor 40 can be arranged relative to the switching device 10. 1 such that the actuating shaft 12 and the motor shaft 41 are parallel;
• Via a shift linkage, the motor shaft 41 can be brought into operative connection with the actuating shaft 12 of the switching device 10.1,
• wherein the shift linkage comprises a (first) coupling element 30, which connects the motor shaft 41 with the actuating shaft 12.

The at least one switching device 10.1 (10.2) is a hand knob 80 (see Fig. 2 ) is manually switched ON and OFF for opening and closing of conductor tracks. The hand knob 80 is the actuating shaft 12 is placed. The actuating shaft is arranged perpendicular to the front panel of the switching devices. The mounting surface of the switching devices is located on the back of at least one switching device and there primarily serves for mounting on a mounting rail. The electric motor 40 is preferably also fastened with its rear side on the same mounting rail.

The operation of the invention is designed to rotate the electric motor 40 via a remote switch to switch one (or more) switchgear (s) from the off position to the on position. The situation of Fig. 1 shows the switching device 10.1 in the OFF position. The shift linkage is designed such that by means of one rotation of the motor shaft 41, the one switching device 10.1 can be switched from its OFF position to its ON position.

On the motor shaft 41, a crank 42 is fixed, at the end of a pin 44 is trained, which is directed parallel to the motor shaft. The pin 44 engages over a path S during one revolution of the motor shaft 41 to a pin 51 formed as a driver, which is attached to the first coupling element 30. The driver on the first coupling element is directed perpendicularly away from the first coupling element 30 and toward the motor shaft.

The first coupling element 30 is articulated on the actuating shaft 12 via a one-armed lever 15 and has a second one-armed lever 11, 15 a parallel guide. The coupling element 30 is mounted at both ends 22 on the levers 11, 15. The axes of rotation of the two levers 15 and the motor shaft 41 are arranged mechanically parallel to each other. During one revolution of the motor shaft 41 engages the arranged on the motor shaft 41 Driver 44 at least in an angular range W of 90 ° (or greater) to the attached to the coupling element 30 driver 51 at. About the entrainment in the angular range W, the coupling element is taken over a coupling path S and the switching device 10.1 in an angular range W of 90 ° (or greater) is actuated. At the end of the operation, the switching device 10.1 locks in its ON position.

The rotational movement Dr of the electric motor 40 is turned off after one revolution of the electric motor 40. The shutdown of the electric motor 40 via the actuation of a moving of the motor shaft 41 switching cam 45 via a micro-switch 48. The latter is more detailed in Fig. 2 shown.

The shift linkage is housed in a - not shown in the figures - housing. The housing may be formed prismatic. The housing is designed to be mountable, wherein it faces with its housing underside of the front side / operating side of the at least one switching device 10.1 and can be fastened there. The housing top is the housing bottom parallel and only the actuating shaft 12 is passed through the housing top. The housing top can be designed as a removable lid. In a closed housing thus only the actuating shaft 12 is visible to the outside and a patch on the actuating shaft 12 hand knob 80 (see Fig. 2 ). The second one-armed lever 11 (15) can be freely rotatably arranged in the housing described.

As a preferred further arrangement according to the invention, however, it can also be provided that the second one-armed lever 11 (15) is located on the actuating shaft 12 of a second switching device 10.2. Both situations are in Fig. 1 represented by the reference numerals 10.2 and 12 are entered in parentheses. In both cases, the shift linkage works identically. If two switching devices are present, both switching devices can be switched from their OFF positions to their ON positions.

In the Fig. 2 is slightly perspective view of a second arrangement according to the invention shown.

The shift linkage comprises the first coupling element 30 and a second coupling element 31, both of which are guided in parallel between the motor shaft 41 and the actuating shaft (s) 12. First 30 and second coupling element 31 are hinged to the actuating shaft 12 via a double-armed lever 16.

The electric motor 40 and the two switching devices 10.1, 10.2 are in turn arranged side by side such that the actuating shafts 12 of the switching devices and motor shaft 41 are parallel. The two switching devices 10.1, 10.2 are arranged on both sides of the motor shaft 41.

The shift linkage again comprises a crank 42 arranged on the motor shaft 41. The crank engages via a pull rod 50 to a driver 51 'designed as a cylinder and attached to the first coupling element 30. The pull rod 50 is supported at one end at the end 46 of the crank 42 and at the other end 53 is mounted via a sliding block 52 which is movable on the first coupling element.

About the pull rod 50, the rotational movement Dr of the motor shaft 41 is converted into a linear movement, the pull rod 50 via the sliding block behind the first coupling element attached to the driver 51 'hooks. The bearing 46 on the crank is seconded at a distance (radius) from the center of rotation of the motor shaft 41, that with one revolution of the motor shaft 41, the tie rod 50 can perform sufficient linear movement for movement and full entrainment of the driver 51 'on the first coupling element.

The ends of the coupling elements 30, 31 are in Einhängeöffnungen, or on rotatable retaining pin on the levers 15 (version after Fig. 1 ) or levers 16 (version after Fig. 2 ). The coupling elements may be rigid in the form of two coupling rods. Alternatively, they can also be formed by taut ropes.

The FIGS. 3A and 3B show two positions of the shift linkage and the motor shaft. The Fig. 3A shows the situation of the motor shaft 41 in the initial position and the (or) switching device (s) in the OFF position. The Fig. 3B shows the action of the shift linkage during the ON shift.

On the motor shaft 41, a switching cam 45 is screwed, which cooperates with a micro-switch 48. The electric motor remains actuated until the motor shaft has made a complete revolution, after which the switching cam 45 then actuates the microswitch 48 in each case. After one revolution, the relay of latching stops by a limit switch. During the turn, the mechanism of the shift linkage and the Actuating shafts of the two switching devices turned. After a quarter turn clockwise, the switchgear (s) is moved to the ON position. The motor drive enters the starting position and is immediately ready to start again at this position for the next switch-on command.

In the starting position according to Fig. 3A (Switching device in OFF) is the one arm of the double-armed lever 16, to which the first coupling element is articulated, rotated in a position to the right. The position of the one arm of the double-armed lever 16 has approximately an angle of 135 ° with respect to the line connecting both operating shafts of the switching devices. Likewise, the first coupling element 30 is shifted in an extreme position to the right. The one arm of the double-armed lever and the first coupling element 30 thus assume an extreme shifted to the right position. The crank 42 on the motor shaft 41 is in this position approximately parallel to the double-armed lever 16 and also has a position at an angle of about 135 ° relative to the line connecting both operating shafts of the switching devices.

In Fig. 3B after a ON-switching pulse to the motor, the motor shaft 41 makes a turn. Here, the pull rod 50 takes over the slider 52 at its end the driver 51 'with. The first coupling element 30 moves the double-armed lever 16 in a clockwise direction. After taking the ON-switching position are directed to the first coupling element arms of the double-armed lever 16 of the switching devices in a position with an angle of about 45 ° with respect to the line connecting both operating shafts of the switching devices. The actuating shafts have each made a 90 ° turn.

In Fig. 3A it is indicated that two more coupling elements 30 'and 31' can be arranged beyond the double-armed lever 16. These coupling elements 30 ', 31' lead to a third, not shown switching device. The third, or further switching device lies with its front side parallel to the front sides of the first two switching devices; Likewise, the actuating shaft of the further switching device is parallel to the motor shaft and the actuating shafts of the first two switching devices. On the operating shaft of the further switching device, a double-armed lever is also present, at the ends of the coupling elements 30 ', 31' then attack. Again, the coupling elements 30 ', 31' are guided in parallel. The electric motor in this case should be designed so strong in its performance that it can muster the mechanical work to operate more than two switching devices.

reference numeral

Dr

direction of rotation

S

Koppelweg

W

angle

10.1 10.2

elec. switchgear

11

freely rotatable arm lever

15

one-armed lever

16

two-armed lever

22

Bearings on levers 15, 16

30 30 '31 31'

coupling elements

40

engine

41

motor shaft

42

crank

44

driver cams

45

switching cams

46

Bearing to crank for drawbar

48

microswitch

50

pull bar

51 51 '

Driver (pin, cylinder)

52

slide

53

Bearings on the sliding block

80

Hand knob

100

switching signal

Claims (11)

Motor-driven reclosing device for attachment to at least one electrical switching device, in particular to a low-voltage circuit breaker or the like, wherein the switching device via a hand knob and an actuating shaft in the ON and OFF position is drehbetätigbar,
Wherein the reconnection device comprises an electric motor (40) with motor shaft (41),
● wherein the motor shaft (41) can be brought into operative connection with the actuating shaft (12) of at least one switching device (10.1) via a shift linkage (30, 42, 50),
Wherein the shift linkage (30, 42, 50) comprises a first coupling element (30), with which the motor shaft (42) with the actuating shaft (12) is connectable and the shift linkage is formed such that by means of a rotation of the motor shaft (41) at least one switching device (10.1) is switchable from an OFF position to an ON position. Reclosing device according to claim 1, characterized in that the first coupling element (30) on the actuating shaft (12) via a one-armed lever (15) is articulated. Recloser device according to claim 1 or 2, characterized in that the shift linkage (30, 42, 50) comprises a crank (42) arranged on the motor shaft (41), which is connected via a pull rod (50) to one of the first coupling element (30). attached driver (51 ') attacks. Reclosing device according to claim 3, characterized in that the drawbar (50) at one end at the end (46) of the crank (42) is arranged and at the other end (53) via a on the first coupling element (50) movable sliding block (52) is mounted. Reclosing device according to one of the preceding claims, characterized in that the motor drive to one or more switching devices (10.1, 10.2) attachable is, wherein with a rotary actuation of 90 °, the one or more switching devices from an OFF position to an ON position are switchable. Reclosing device according to claim 5, characterized in that the shift linkage comprises two parallel guided coupling elements (30, 31) which are articulated between two on the actuating shafts (12) of two switching devices (10.1, 10.2) arranged double-armed levers (16). Reclosing device according to claim 5 or 6, characterized in that the motor drive in such a way next to one or more switching devices (10.1, 10.2) can be arranged side by side, that actuating shaft (s) (12) and motor shaft (41) are parallel. Reclosing device according to one of the preceding claims, characterized in that a shutdown of the electric motor (40) via an actuation of one of the motor shaft (41) mitbewegten switching cam (45) via a microswitch (48). Reclosing device according to one of the preceding claims, characterized in that the shift linkage is housed in a mountable prismatic housing, which is attachable with its housing underside a Fronseite the at least one switching device (10.1, 10.2) facing. Use of a reclosing device according to one of the preceding claims, characterized in that the reclosing device for at least one circuit breaker (10.1, 10.2) is provided, which can be switched off by working current or undervoltage release. Use of a reclosing device according to claim 10, characterized in that the reclosing device is provided for at least one DC circuit breaker, which is connected in photovoltaic systems between photovoltaic modules and inverters.

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