The present invention is related to the technological field of electrical protection switches, and particularly a unipolar switching module or a multipolar low-voltage circuit breaker using said unipolar switching module, operated by an operating handle, said unipolar switching module comprising bipartite insulating case, included in a main case, or individually, each said unipolar switching module of said circuit breaker comprising a rotary contact system, an arc extinguishing system and preferably a thermomagnetic tripping set or an electronic tripping set, able to establish and break the current conduction in a distribution line.
As known in the state of the art, the working of molded case circuit breakers may have their operation based on thermal, magnetic, thermomagnetic or even electronic principles, through the movement of electrical contacts, which can be used, mostly, to protect electrical circuits subjects to short-circuiting and/or electrical overloads generated by levels of electrical current that exceed a previously established nominal limit, by linking input and output terminals, connected to the power electric line to be protected.
Therefore, as already known in the state art that circuit breakers fundamentally works in analogous way to electrical switch devices, that is, they work in such a way as to change the state of electrical conduction of an electrical circuit between the “ON” and “OFF” states of operation. In addition to acting automatically, conventional circuit breakers also comprise an operating handle operable by a user. In this type of construction in molded case it is typical that the current load capacity support relatively high values around 1600 A and even more.
It is common to note in the state of the art that most of these molded case circuit breaker models and constructions are provided with an incorporated thermomagnetic tripping unit for automatic operations under predetermined failure conditions.
In many that cases, present in the state of the art, the tripping unit was built in a removable and replaceable manner.
In other cases, the switching modules have been constructed in a removable and replaceable way, interchangeable between a module comprising a state/electronic tripping assembly and another module comprising an electromagnetic tripping set, comprising internally to the circuit breaker all the triggers required by the poles of the device.
Although such replaceable tripping assemblies have advantages due to their own characteristic of operating flexibility, these assemblies require complicated docking elements to ensure coupling between the modules and the molded base of a molded case circuit breaker, and the tripping modules constructed in tripolar arrangement, which ultimately increases the initial acquisition cost.
Another type of construction of molded case circuit breaker was taught the individual construction of switching modules, mounted side by side with the purpose of obtaining individual insulation of switching systems per pole.
Similarly, the construction of bipartite cases of individual switching modules is known in the art, where the modules are mounted side by side with the purpose of obtaining individual isolation of switching systems per pole, including double isolation through a case involving the individual switching modules.
These constructions are widely known by the persons skilled in the art, however all these solutions contained a gap as to inclusion in these bipartite individual switching modules of an incorporated thermomagnetic tripping assembly or an electronic tripping set, since advantages in arrangements can be provided with in order to gain flexibility in the application or otherwise in the original manufacture, as is the case, bringing advantages in economic terms, of time, inventory management and use of standardized components, bringing benefits in simplicity, avoiding complicated assemblies, which necessarily would imply the administration of more components and their controls, increasing the final cost of the product.
One of the solutions of the state of the art, the U.S. Pat. No. 4,037,183 dated of 1976, presents a multipole molded case circuit breaker, provided with a removable and replaceable solid state tripping unit, built with all the elements of current failure detection with a common case. For each of the poles of the circuit breaker, the unit includes an input and a power circuit of a current transformer, mounted on a board, arranged in the inside the case. The output circuit is connected to operate a permanent magnet trigger mechanism, for actuate a mechanical lock, which normally keeps the contacts operating mechanism in an initial position. The invention also taught an arrangement of two transformers, used inside the removable module, positioned at a right angle, seeking a favorable compaction for its construction, of the dimensions of the replaceable block. U.S. Pat. No. 4,037,183 and also U.S. Pat. No. 4,064,469 in 1977, present between them an exchangeability in the use of both thermomagnetic and electronic state modules.
Another solution is presented in patent EP0177438, initially filed in 1984, wherein a multipolar molded case circuit breaker has 3 unipolar sets mounted side by side, wherein a handle set contained in a central first pole, together with a movable contact set having a traverse bar, which couples to another two lateral modules connected to the first arm of the contacts set, wherein the arms guarantee motion sync of each movable contact set during normal operations. Each pole contains a mechanism capable of tripping said circuit breaker.
Another solution is presented in document EP0542636 and EP0538149 in 1991, which presents a multipolar low-voltage circuit breaker device having a double case, each pole including a unipolar switching unit having a parallelepiped plastic box having extended two side faces. Contacts are additionally provided and associated to an extinguishing chamber housed with the unipolar switching unit. Several units are mounted side by side in the parallelepiped box to form a multipolar circuit breaker. Another patent containing an interchangeable tripping unit used in a molded case circuit breaker is taught in patent EP0591073 in 1992 in a similar way.
U.S. Pat. No. 6,222,433 presents a molded case circuit breaker comprising unipolar circuit breaker modules called cassettes, where the handle and the operating mechanism are mounted on the central cassette, and a single thermomagnetic tripping set mounted on the terminals of the unipolar cassettes that are inserted inside a second case.
These documents presented and others from the state of the art have sought by the construction of unipolar tripping modules to increase breaking capacity and also simplify the assembly process in manufacturing or the flexibility of the product application, that currently has several options for building such devices. Various solutions were built, from the first interchangeable model between tripping electromagnetic/electronic modules to the modules of double case, at times seeking the efficiency of the manufacturing process, at others enhancing operating conditions and useful life.
The first objective of the present invention is to provide unipolar switching modules constructed to facilitate the assembly of components of a low-voltage molded case circuit breaker.
The second objective of the invention is to use a same case for several unipolar switching modules and a same external case to encase said thermomagnetic unipolar switching modules.
The third objective of the invention is to use a same case for several unipolar switching modules and a same external case to encase said electronic unipolar switching modules.
The fourth objective of the invention is to use a same external case both for electronic tripping and thermomagnetic cassettes, in different nominal current ranges.
The fifth objective of the invention is to provide a switching device with a lesser number of components than the state of the art.
The sixth objective of the invention is to provide a switching device satisfying the above requirements, being compact in its longitudinal measure and simplified, maintaining the structural rigidity.
Said unipolar switching modules (9, 9′, 9″) constructed in parallelepiped format comprising a first cavity (9a) and a second cavity (9b), made of insulating material preferably inversely identical made of insulating material, forming a case (9ab), better viewed with a details in the
In the state of the art, the search for advantageous arrangements are constant in both operation and manufacturing. Despite this, an assembly arrangement not obtained so far refers to assembly preparations, use of synergistic components both using thermomagnetic and electronic technology, already known, but that allow greater flexibility of assemblies and use of standardized components between them, without this burdening costs or leading to the use of dedicated components for each choice of arrangement. In this way the solution presented seeks to solve this in a way, wherein several configurations are permissible using the same philosophy and preparation, thus facilitating a range of pre-assemblies and administration of components in an organized way and that allows the use of various components throughout this range in a standardized and versatile way.
The molded case circuit breaker (1a, 1b) according to a first and second preferred embodiments of the present invention now detailed, meets a first objective of the invention, in the sense of providing unipolar circuit switching modules (4, 4′, 4″, 9, 9′, 9″) constructed to facilitate the assembly of components of a low-voltage molded case circuit breaker, provided with a different construction concept to others from the state of the art, its main fundament being the fact that the components of the unipolar switching module (4, 4′, 4″, 9, 9′, 9″) comprising at least one said thermomagnetic tripping set (4r, 9r), said rotary contact system (4q, 9d) best seen in
A second objective achieved by the invention is to use a same case (4ab, 9ab) for unipolar thermomagnetic trip switching modules (4, 4′, 4″, 9, 9′, 9″), wherein the second cavity (4b, 9b) is inversely identical to said first cavity (4a, 9a), which together form said insulating case of said unipolar thermomagnetic switching modules (4, 4′, 4″, 9, 9′, 9″) of said low-voltage circuit breaker (1a, 1b), and also use a same external case (3), comprising a base case (3a), intermediate case (3b) and cover (3c) which serves all unipolar circuit switching modules (4, 4′, 4″, 9, 9′, 9″), due to their outer construction being identical to all the modules for using identical fastening elements (4k, 10s),), equalization shafts (2b, 2b′) and positioning shafts (2c, 2c′).
A third objective achieved by the invention is to use a same case (10ab, 11ab) for unipolar electronic trip switching modules (10, 10′, 10″, 11, 11′, 11″), wherein the second cavity (10b, 11b) is inversely identical to said first cavity (10a, 11a) which together form said insulating case (10ab, 11ab) of said unipolar electronic circuit switching modules (10, 10′, 10″, 11, 11′, 11″) of said low-voltage circuit breaker (1c, 1d), and also use a same outer case (3′) comprising base case (3a), intermediate case (3b′) and cover (3c′) which serves all unipolar switching modules (10, 10′, 10″, 11, 11′, 11″), due to their external construction being identical to all the modules for using identical fastening elements (4k, 10s), equalization shafts (2b, 2b′) and positioning shafts (2c, 2c′), and said base case (3a) is interchangeable between said unipolar thermomagnetic trip switching modules (4, 4′, 4″, 9, 9′, 9″).
A fourth objective of the invention is achieved by using a same external cavity (4a, 4b, 9a, 9b, 10a, 10b, 11a, 11b) for unipolar thermomagnetic/electronic trip switching modules (4, 4′, 4″, 9, 9′, 9″, 10, 10′, 10″, 11, 11′, 11″) which externally have identical dimensions, in a first, second, third and fourth preferred embodiment of the invention respectively, in different nominal current ranges, due to the modular concept proposed, where it is possible to make the prior assemblies, with a predetermined values of nominal current range, regardless of the range for the thermomagnetic tripping set (4r, 9r), facilitating the administration of inventories for subsequent final assembly, as said unipolar thermomagnetic trip switching modules (4, 4′, 4″, 9, 9′, 9″) and/or unipolar electronic circuit switching modules (10, 10′, 10″, 11, 11′, 11″) are stable, interchangeable, sidewardly fixed to each other, containing rotary contact systems (4q, 9d, 10d, 11d) in equalized form, through said equalization shaft (2b) and alternatively associated said second equalization shaft (2b′), where said operating and tripping mechanism (2, 2′), fixed on the upper part of said central unipolar switching module (4, 9, 10, 11), which comprises two positioning shafts (2c, 2c′) are introduced into the side positioning holes (4h, 4j) of the first or second insulating cavities (4a, 4b, 9a, 9b, 10a, 10b, 11a, 11b) and between the unipolar side switching modules (4, 4′, 4″, 9, 9′, 9″, 10, 10′, 10″, 11, 11′, 11″), allowing an equalization shaft (2b) and alternatively associated said second equalization shaft (2b′) of the rotary contact system (4q, 9d, 10d, 11d) to command the action of any one of the rotary contact systems (4q, 9d, 10d, 11d) coupled sidewardly, comprised in said unipolar switching modules (4′, 4″, 9′, 9″, 10′, 10″, 11′, 11″) in an identical manner, when said operating and tripping mechanism (2, 2′) is triggered, both by the operator in “ON/OFF” operations, and in any anomalous pre-configured situation arising from said thermomagnetic tripping bar (8a) pre-configured by the thermal adjustment button (8d), or from the magnetic trip lever (4ra, 9ra), in any anomalous pre-configured situation by means of a magnetic adjustment button (8b) jointly with a said thermomagnetic tripping bar (8a) of said tripping set (8) or also from the current measurer and power supply set (10h, 11i), which are electrically coupled by means of a power terminal (10k, 11p) to an electronic controller (W), incorporated inside the molded case circuit breaker (1c, 1d) and capable of promoting an electronic trip, triggering the opening of the rotary contact system (10d, 11d) thereof, through said operating and tripping mechanism (2) automatically.
A fifth objective of the present invention is achieved by providing a breaker switching device with a lesser number of components than the state of the art, when noting the options that use unipolar switching modules (4′, 4″, 9′, 9″, 10′, 10″, 11′, 11″), as it does not require additional thermomagnetic or electronic trips in specific modules, when compared to that presented in the state of the art, which is situated outside the switching modules, which implies the use of additional fastening elements, such as hooks and complex docking support between each other.
A sixth objective of the invention is achieved by providing a switching device, such as a low-voltage molded case circuit breaker (1a, 1b, 1c, 1d), satisfying the above requirements, being compact in its longitudinal measure and simplified, maintaining the structural rigidity, due to the elimination of factors such as the use of fastening elements such as hooks and complex docking support, which by their connection nature, weaken the structure.
Besides the objectives proposed already achieved by the invention now proposed a tripping set (8) is provided, easily coupleable to the unipolar switching module (4, 4′, 4″, 9, 9′, 9″), where it is positioned vertically through the said seat base (8h) and of said traverse seat (8g) on the top face (4f, 9t) and longitudinally through the vertical positioning rod (81) which encases in the recess (4x, 9x), in any one of the unipolar switching modules (4, 4′, 4″, 9, 9′, 9″), being additionally positioned vertically through the vertical positioning rails (41) and the guide rails (8f). Side locking shafts (8j) are additionally provided in said tripping set (8), which behave as stand-bys and which at the time wherein the unipolar switching modules (4, 4′, 4″, 9, 9′, 9″) are positioned side by side, former are positioned in the positioning holes (4g) of the first or second insulating cavities (4a, 4b, 9a, 9b), whereby promoting for this positioner set a fast locking of said tripping set (8) in the 3 possible displacement shafts.
Lastly, the unipolar thermomagnetic switching modules (4, 4′, 4″, 9, 9′, 9″) or the electronic unipolar switching modules (10, 10′, 10″, 11, 11′, 11″) chosen according to a set pre-arrangement, coupled to the operating and tripping mechanism (2, 2′) and a tripping set (8) or alternatively an electronic controller (W) are introduced into the outer case (3, 3′), specifically at the base case (3a), so as jointly with the intermediate case (3b, 3b′) and said cover (3c, 3c′), to form said low-voltage molded case circuit breaker (1a, 1b, 1c, 1d), constituting a double insulating case.
Said operating and tripping mechanism (2, 2′) comprises an operating handle (2a, 2a′), whose rotational articulation transmits to the equalization shaft (2b) or alternatively a second equalization shaft (2b′) to said rotary contact systems (4q, 9d, 10d, 11d) the force necessary to open and close to command the action of any one of said rotary contact systems (4q, 9d, 10d, 11d) of said circuit breaker (1a, 1b, 1c, 1d), by means of handles, locking elements and springs (not represented) known in the state of the art. Additionally, when a failure occurs, notably an overcurrent or a short-circuit, the contacts are provided to open automatically, due to the action of a trip device as preferably the thermomagnetic tripping set (4r), acting jointly with the operating and tripping mechanism (2, 2′).
Alternatively and according to a third and fourth embodiments of the invention, from said current measurer and power supply set (10h, 11i) associated with a said solid state electronic controller (W), it is possible to control said trip coil (13) coupled to said operating and tripping mechanism (2, 2′) comprising a shaft (2f) associated to said lever (13b) capable of transmitting a displacement movement of the trigger support (13d) comprising actuator latch (13c) from the actuator (13f), wherein said trip coil (13), its said coil winding of the power terminals (13e) being electrically powered from said solid state electronic controller (W), wherein said trip coil (13) comprising an armature, encase a magnet with a casing and a cylindrical core, comprising compression spring, among other components (not represented), which assist the movement of said actuator (13c), in the ratio of external components of said trip coil (13), where said core (not represented) when energized from a signal of said solid state electronic controller (W), move said actuator (13f), associated to said trigger support (13d) and lever (13b) to provoke a displacement of the internal trigger and trip mechanism (2, 2′) and disarm said circuit breaker (1c, 1d), to an intermediary position between the closed position “ON” and the open position “OFF”, for a “TRIP” state of said circuit breaker (1c, 1d), breaking an associated electrical circuit.
After said “TRIP”, the prior “OFF” (re-arm) movement to a restart wherein said associated circuit breaker (1c, 1d) associated can be “ON”, or “OFF” (re-armed), after said associated circuit breaker (1c, 1d) associated is tripped, is carried out wherein said side ledge (13a) of said trip coil (13) is associated with a said repositioning latch (2e) of said handle (2a, 2a′), when said handle (2a, 2a′) of said operating and tripping mechanism (2, 2′) returns to the initial position after a trip and repositions said trip coil (13) for a new trigger, conducting said lever (13b), trigger support (13d) and actuator (13f) to an initial position capable of a new trip of said trip coil (13).
The circuit breakers (1a, 1b, 1c, 1d), including the reception of auxiliary trip devices which can be disarm devices like auxiliary trip coils of the subtension type or auxiliary remote trip coils have already been achieved or proposed.
Another proposal included designing unipolar thermomagnetic switching modules (4, 4′, 4″, 9, 9′, 9″) or unipolar electronic trip switching modules (10, 10′, 10″, 11, 11′, 11″). A unipolar switching module (4, 4′, 4″, 9, 9′, 9″, 10′, 10″, 11, 11′, 11″) of this kind generally comprises a certain number of parts which are common to both kinds of unipolar switching modules. Other parts of the unipolar switching module are, however, specific for the unipolar switching module (4, 4′, 4″, 9, 9′, 9″) and other different parts are specific for electronic trip unipolar switching module (10, 10′, 10″, 11, 11′, 11″). Additionally, certain parts are common to both kinds of modules, such as for example preferably the rotary contact system (4q, 9d, 10d, 11d) or said arc-extinguishing system (4u, 9e, 9f, 10e, 11e, 11f) and their grids (4ua, 9ea, 9fa, 10ea, 11ea, 11fa), and also a base case (3a), among others.
The fact that a large number of parts are different in these two types of devices is a disadvantage as this leads to a relatively high manufacturing cost and with a set cost that is also relatively high.
Another object achieved of the present invention is to propose a circuit breaker (1a, 1b, 1c, 1d), being able to constitute a switching device containing unipolar thermomagnetic switching modules (4, 4′, 4″, 9, 9′, 9″) or containing unipolar electronic trip switching modules (10, 10′, 10″, 11, 11′, 11″) to which almost all the parts that constitute said circuit breaker (1a, 1b, 1c, 1d) are identical for both, which may be constructed.
It should obviously be understood that other modifications and variations made to this invention are considered to be within the scope of the present invention.
Filing Document | Filing Date | Country | Kind |
---|---|---|---|
PCT/BR2018/050477 | 12/21/2018 | WO |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2020/124175 | 6/25/2020 | WO | A |
Number | Name | Date | Kind |
---|---|---|---|
4037183 | Gaskill | Jul 1977 | A |
4064469 | Gryctko | Dec 1977 | A |
6222433 | Ramakrishnan | Apr 2001 | B1 |
10410810 | Rota Martir | Sep 2019 | B2 |
20050195055 | McCoy | Sep 2005 | A1 |
20140339197 | Moreau | Nov 2014 | A1 |
20180323027 | Tomaselli | Nov 2018 | A1 |
Number | Date | Country |
---|---|---|
102014011570 | Jun 2015 | BR |
102014020891 | Feb 2016 | BR |
112012005824 | Mar 2016 | BR |
0177438 | Apr 1986 | EP |
0538149 | Apr 1993 | EP |
0542636 | May 1993 | EP |
0591073 | Apr 1994 | EP |
0961306 | Dec 1999 | EP |
2757675 | Jan 1999 | FR |
2013191924 | Dec 2013 | WO |
Entry |
---|
International Search Report and Written Opinion for International Application No. PCT/BR2018/050477 dated May 14, 2019, 16 pages. |
Number | Date | Country | |
---|---|---|---|
20220076911 A1 | Mar 2022 | US |