EP1054425A1 - Modular auxiliary electrical device, particularly for minimum operating voltage control - Google Patents
Modular auxiliary electrical device, particularly for minimum operating voltage control Download PDFInfo
- Publication number
- EP1054425A1 EP1054425A1 EP00110364A EP00110364A EP1054425A1 EP 1054425 A1 EP1054425 A1 EP 1054425A1 EP 00110364 A EP00110364 A EP 00110364A EP 00110364 A EP00110364 A EP 00110364A EP 1054425 A1 EP1054425 A1 EP 1054425A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- relay
- lever
- electrical device
- voltage control
- minimum
- 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.)
- Withdrawn
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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
- H01H83/12—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by voltage falling below a predetermined value, e.g. for no-volt protection
-
- 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
- H01H71/02—Housings; Casings; Bases; Mountings
- H01H71/0264—Mountings or coverplates for complete assembled circuit breakers, e.g. snap mounting in panel
- H01H71/0271—Mounting several complete assembled circuit breakers together
- H01H2071/0278—Mounting several complete assembled circuit breakers together with at least one of juxtaposed casings dedicated to an auxiliary device, e.g. for undervoltage or shunt trip
Definitions
- the present invention relates to a modular auxiliary electrical device particularly for minimum operating voltage control.
- a device of this kind is usually associated with a safety circuit breaker in order to open the circuit if the supply voltage drops below a preset minimum level.
- a constant problem in the design and manufacture of this kind of device is to reduce the mechanical and constructive complexity and the dimensions as much as possible while maintaining absolute reliability and precision in operation.
- Another fundamental problem is to improve the performance of electrical devices while maintaining compact dimensions which in any case should comply with the standards.
- the aim of the present invention is to provide a modular auxiliary electrical device, particularly for minimum voltage control, which has improved electrical characteristics.
- An object of the invention is to provide a modular auxiliary electrical device, particularly for minimum voltage control, which can be manufactured more cheaply than conventional ones and at the same time has an improved performance.
- Another object of the invention is to provide a modular auxiliary electrical device particularly for minimum voltage control which is more reliable in use.
- a modular auxiliary electrical device particularly for minimum operating voltage control comprising a casing adapted to be associated with an electrical device, such as a circuit breaker, and comprising an electrical connection means for connection to conducting components, the electrical connection means being connected to a kinematic means adapted to act on the associated electrical device; characterized in that it comprises a lever which is rigidly coupled to a movable portion of an armature of a relay, the lever being adapted to actuate the kinematic means when the value of the supply voltage drops below a preset value.
- the modular auxiliary electrical device particularly for minimum operating voltage control substantially comprises a casing 1 which has the classic standard shape and forms, at a rear face 105, means for coupling to an omega-shaped guide (not shown) according to DIN standards.
- the casing 1 has, at the front face, a protrusion 109 in which an actuation element or actuation lever 11 is arranged.
- the casing 1 contains an electrical actuation member, constituted by a relay, which is generally designated by the reference numeral 110 and is associated with a kinematic tripping system 114 and with terminals 18 and 118 for the external electrical connections.
- a relay which is generally designated by the reference numeral 110 and is associated with a kinematic tripping system 114 and with terminals 18 and 118 for the external electrical connections.
- the actuation lever 11 comprises a lever cover 4 and a lever spring 13 which is coaxial to the lever.
- the lever 11 is connected to a driving lever 9 by means of a lever linkage 27.
- the driving lever 9 acts by means of a driving spring 14.
- the kinematic system 114 also comprises an engagement lever 6 which is pivoted to a pivot 3 and acts in contrast with, and by virtue of the action of, an engagement spring 12.
- a motion lever 8 is pivoted on a pivot 20 of a release lever 10 and acts in cooperation with a motion spring 17 for return to position.
- the relay 110 comprises a coil support 24 which comprises a relay spool 22 and a relay core 19. The ends of the winding of the coil are connected to an electronic board 23 which has two outputs connected to the terminals 18 and 118.
- the motion lever 8 comprises a slot 111 which is adapted to receive an actuation pin of an adjacent device and, on the opposite side, a pin for the actuation of an adjacent device.
- the relay core 19 comprises a lower fixed part 119 and an upper movable part 219 with which a minimum-voltage lever 7 is rigidly coupled; the lever is actuated by a relay spring 15 and is adapted to actuate the kinematic system 114.
- a relay resetting spring 16 is adapted to act on the minimum-voltage lever 7 in order to reset the relay, i.e., return the armature of the relay to the closed position, or to move the upper movable part 219 to the lowered position with reference to the figures.
- the device By actuating the lever 11, the device is moved from the position in which the kinematic system is open, shown in Figure 3, to the position in which the kinematic system is closed, shown in Figure 4.
- the electronic board 23 establishes an activation delay, typically 300-500 milliseconds.
- the electronic board 23 also comprises a converter so as to supply DC current to the coil in order to avoid unpleasant humming due to supply of the coil with AC current.
- the relay 110 is characterized by extremely low power absorption, so that it does not heat up and has practically negligible consumption.
- the relay reset spring 16 After acting, the relay reset spring 16 immediately returns the upper part 219 to the closed position, shown in Figure 4.
- the relay reset spring 16 is adjusted so as to close the part 219 without striking the surface of the part with excessive force, which might damage it, in the long run.
- the relay spring 15 reopens the relay, which is not kept closed by the flow of current.
- the materials used, as well as the dimensions, may of course be any according to requirements and to the state of the art.
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- Details Of Connecting Devices For Male And Female Coupling (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
Abstract
A modular auxiliary electrical device, particularly for minimum operating voltage control,
includes a casing adapted to be associated with an electrical device, such as a circuit
breaker, and includes an electrical connection means for connection to conducting
components. The electrical connection means are connected to a kinematic system
which is adapted to act on the associated electrical device. The auxiliary device includes
a lever which is rigidly coupled to a movable portion of an armature of a relay and is
suitable to actuate the kinematic means when the value of the supply voltage drops
below a preset value.
Description
- The present invention relates to a modular auxiliary electrical device particularly for minimum operating voltage control.
- A device of this kind is usually associated with a safety circuit breaker in order to open the circuit if the supply voltage drops below a preset minimum level.
- A constant problem in the design and manufacture of this kind of device is to reduce the mechanical and constructive complexity and the dimensions as much as possible while maintaining absolute reliability and precision in operation.
- The need is constantly felt to simplify the kinematic systems from the constructive point of view in order to achieve low-cost production, and in this regard it is also very important to achieve an assemblying which is simple and can be automated.
- Another fundamental problem is to improve the performance of electrical devices while maintaining compact dimensions which in any case should comply with the standards.
- The aim of the present invention is to provide a modular auxiliary electrical device, particularly for minimum voltage control, which has improved electrical characteristics.
- An object of the invention is to provide a modular auxiliary electrical device, particularly for minimum voltage control, which can be manufactured more cheaply than conventional ones and at the same time has an improved performance.
- Another object of the invention is to provide a modular auxiliary electrical device particularly for minimum voltage control which is more reliable in use.
- This aim, these objects and others which will become better apparent hereinafter are achieved by a modular auxiliary electrical device particularly for minimum operating voltage control comprising a casing adapted to be associated with an electrical device, such as a circuit breaker, and comprising an electrical connection means for connection to conducting components, the electrical connection means being connected to a kinematic means adapted to act on the associated electrical device; characterized in that it comprises a lever which is rigidly coupled to a movable portion of an armature of a relay, the lever being adapted to actuate the kinematic means when the value of the supply voltage drops below a preset value.
- Further characteristics and advantages of the present invention will become apparent from the following detailed description of a preferred but not exclusive embodiment thereof, illustrated only by way of non-limitative example in the accompanying drawings, wherein:
- Figure 1 is a cutout perspective view of the device according to the invention;
- Figure 2 is a lateral elevation view of the device according to the invention, with a wall of the casing removed, illustrating the kinematic system in the closed position;
- Figure 3 is a view, similar to Figure 2, of the kinematic system in the open position;
- Figure 4 is a view, similar to Figure 3, of the kinematic system in the tripped closed position.
-
- With reference to the above figures, the modular auxiliary electrical device particularly for minimum operating voltage control, according to the invention, generally designated by the
reference numeral 100, substantially comprises a casing 1 which has the classic standard shape and forms, at arear face 105, means for coupling to an omega-shaped guide (not shown) according to DIN standards. - The casing 1 has, at the front face, a
protrusion 109 in which an actuation element or actuation lever 11 is arranged. - The casing 1 contains an electrical actuation member, constituted by a relay, which is generally designated by the
reference numeral 110 and is associated with akinematic tripping system 114 and withterminals - The actuation lever 11 comprises a
lever cover 4 and alever spring 13 which is coaxial to the lever. The lever 11 is connected to adriving lever 9 by means of alever linkage 27. Thedriving lever 9 acts by means of adriving spring 14. Thekinematic system 114 also comprises anengagement lever 6 which is pivoted to a pivot 3 and acts in contrast with, and by virtue of the action of, anengagement spring 12. Amotion lever 8 is pivoted on apivot 20 of arelease lever 10 and acts in cooperation with amotion spring 17 for return to position. Therelay 110 comprises acoil support 24 which comprises arelay spool 22 and arelay core 19. The ends of the winding of the coil are connected to anelectronic board 23 which has two outputs connected to theterminals - The
motion lever 8 comprises a slot 111 which is adapted to receive an actuation pin of an adjacent device and, on the opposite side, a pin for the actuation of an adjacent device. - The
relay core 19 comprises a lowerfixed part 119 and an uppermovable part 219 with which a minimum-voltage lever 7 is rigidly coupled; the lever is actuated by arelay spring 15 and is adapted to actuate thekinematic system 114. - A
relay resetting spring 16 is adapted to act on the minimum-voltage lever 7 in order to reset the relay, i.e., return the armature of the relay to the closed position, or to move the uppermovable part 219 to the lowered position with reference to the figures. - By actuating the lever 11, the device is moved from the position in which the kinematic system is open, shown in Figure 3, to the position in which the kinematic system is closed, shown in Figure 4. In case of activation, for example if the supply voltage of the circuit drops below a preset minimum level, there is no voltage across the relay and therefore the armature of the relay is opened, i.e., the
upper part 219 of thecore 19 is raised. To avoid unnecessary activations due to momentary voltage drops, theelectronic board 23 establishes an activation delay, typically 300-500 milliseconds. Theelectronic board 23 also comprises a converter so as to supply DC current to the coil in order to avoid unpleasant humming due to supply of the coil with AC current. Therelay 110 is characterized by extremely low power absorption, so that it does not heat up and has practically negligible consumption. After acting, the relay resetspring 16 immediately returns theupper part 219 to the closed position, shown in Figure 4. Advantageously, therelay reset spring 16 is adjusted so as to close thepart 219 without striking the surface of the part with excessive force, which might damage it, in the long run. - If an attempt is made to close the device, i.e., to move the lever 11 into the closed position, while it is in the tripped-closed condition and there is insufficient voltage across the coil of the
relay 110, therelay spring 15 reopens the relay, which is not kept closed by the flow of current. - In order to reset the device it is sufficient, once the voltage has been restored, to return the lever to the closed position and then reset the circuit breaker.
- In practice it has been observed that the invention achieves the intended aim and objects.
- The modular auxiliary electrical device particularly for minimum operating voltage control, according to the invention, is susceptible of numerous modifications and variations, within the scope of the appended claims. All the details may be replaced with technically equivalent elements.
- The materials used, as well as the dimensions, may of course be any according to requirements and to the state of the art.
Claims (5)
- A modular auxiliary electrical device particularly for minimum operating voltage control, comprising a casing adapted to be associated with an electrical device, such as a circuit breaker, and comprising an electrical connection means for connection to conducting components, said electrical connection means being connected to a kinematic means adapted to act on said associated electrical device; characterized in that it comprises a lever which is rigidly coupled to a movable portion of an armature of a relay, said lever being adapted to actuate said kinematic means when the value of the supply voltage drops below a preset value.
- The device according to claim 1, characterized in that said relay comprises a relay core comprising a lower fixed part and an upper movable part with which said minimum-voltage lever is rigidly coupled, said lever being actuated by a relay spring.
- The device according to claim 1 or 2, characterized in that it comprises a relay reset spring adapted to act on said minimum-voltage lever in order to reset the relay.
- The device according to one or more of the preceding claims, characterized in that said relay reset spring acts on said upper movable part.
- The device according to one or more of the preceding claims, characterized in that said relay comprises a spool for a coil and a coil support, said coil support comprising a wider portion adapted to contain said movable part so as to limit the opening of said movable part.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI991070 | 1999-05-17 | ||
ITMI991070 IT1312446B1 (en) | 1999-05-17 | 1999-05-17 | MODULAR AUXILIARY ELECTRIC DEVICE, PARTICULARLY FOR CHECKING THE MINIMUM OPERATING VOLTAGE |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1054425A1 true EP1054425A1 (en) | 2000-11-22 |
Family
ID=11382973
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00110364A Withdrawn EP1054425A1 (en) | 1999-05-17 | 2000-05-15 | Modular auxiliary electrical device, particularly for minimum operating voltage control |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1054425A1 (en) |
IT (1) | IT1312446B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100343936C (en) * | 2003-11-26 | 2007-10-17 | Lg产电株式会社 | Auxiliary device for circuit breaker |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1028670B (en) * | 1956-09-27 | 1958-04-24 | Wysiaelektrogeraetebau G M B H | Zero voltage lock for electrical controllers or the like. |
US4246558A (en) * | 1979-01-22 | 1981-01-20 | Gould Inc. | Auxiliary feature modules for circuit breakers |
-
1999
- 1999-05-17 IT ITMI991070 patent/IT1312446B1/en active
-
2000
- 2000-05-15 EP EP00110364A patent/EP1054425A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1028670B (en) * | 1956-09-27 | 1958-04-24 | Wysiaelektrogeraetebau G M B H | Zero voltage lock for electrical controllers or the like. |
US4246558A (en) * | 1979-01-22 | 1981-01-20 | Gould Inc. | Auxiliary feature modules for circuit breakers |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100343936C (en) * | 2003-11-26 | 2007-10-17 | Lg产电株式会社 | Auxiliary device for circuit breaker |
Also Published As
Publication number | Publication date |
---|---|
IT1312446B1 (en) | 2002-04-17 |
ITMI991070A1 (en) | 2000-11-17 |
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Effective date: 20070130 |