Patent Application
20100163374
Pursuant to 35 U.S.C. ยง119(a), this application claims the benefit of earlier filing date and right of priority to Korean Application No. 10-2008-0138669, filed on Dec. 31, 2008, the contents of which is incorporated by reference herein in its entirety.
1. Field of the Invention
The present invention relates to a position indicating device for a circuit breaker, and particularly, to a position indicating device for a circuit breaker capable of fast and precisely indicating a position of the circuit breaker moved is within a cradle in which the circuit breaker is accommodated.
2. Background of the Invention
In general, a circuit breaker for high voltage is categorized into a pull-out type and a stationary type. The stationary type circuit breaker merely has a breaker main body secured at a position within an electric power distributing board. The pull-out type circuit breaker includes a movable carriage for conveying a breaker main body to facilitate maintenance and repair of the circuit breaker, terminals electrically connected to a power source side and a load side of a circuit and an outer case, called a cradle, having terminals electrically connected to the breaker main body, structure of which allows push-in and pull-out of the breaker main body.
Here, the pull-out type circuit breaker is employed in a distributing board, by which various electric devices, including the circuit breaker, all disposed therein, are managed so as to drive or control a power station, a substation and the like and to drive a motor. Also, the circuit breaker is accommodated in the cradle secured with the distributing board, and has a run position and a test position. At the run position, a power source side terminal and a load side terminal of the circuit breaker are connected to those of the cradle to thereby be connected to a power source and a load of a circuit so that the circuit breaker is operable, while at the test position, those terminals of the circuit breaker are separated from the terminals of the cradle so that a switching operation of the breaker main body is merely tested.
In order for an operator to move the breaker main body to the test position with respect to the cradle, first, an interlock link provided at the breaker main body is held up and the breaker main body is pulled out. The interlock link is then inserted in a test position determining groove of an interlock plate provided at the cradle. At the position, the power source side terminal and the load side terminal of the breaker main body are separated from those of the cradle. Accordingly, control power is merely supplied to the breaker main body, thereby merely allowing the switching test of the circuit breaker main body. Here, the operator can identify the corresponding position of the breaker main body by viewing a word, which is written on an indication sticker for indicating a test position, the indication sticker located on an upper surface of the interlock plate of the cradle.
Also, the operator may connect the terminals of the breaker main body to those of the crank so as to change the position of the circuit breaker from the test position to the run position at which the circuit is connected to the breaker main body. Here, the operator holds up the interlock link to separate the same from the test position determining groove and then pushes the breaker main body toward the cradle terminals, thereby moving the breaker main body. Afterwards, the interlock link is inserted into a run position determining groove of the cradle so that the breaker main body is located at the run position. After the breaker main body is moved to the run position, the operator can identify the corresponding position by viewing a word, which is written on an indication sticker for indicating the run position, the indication sticker also located on the upper surface of the interlock plate of the cradle.
Here, the circuit breaker, as aforementioned, includes the circuit breaker main body and the movable carriage. The circuit breaker main body includes a plurality of terminals connectable to a power source side terminal and a load side terminal of the cradle, respectively, a main circuit portion provided with contacts prepared for each AC phase, a vacuum interrupter and the like for breaking a circuit between a power source and a load upon occurrence of a fault current on the circuit, and a switching mechanism for switching by closing or opening the main circuit portion. The movable carriage is employed to move the circuit breaker main body to the run position or the test position.
In the configuration of the cradle and the circuit breaker according to the related art, the indication sticker for indicating a position (run or test position) of the breaker main body is attached onto the upper surface of the interlock plate, which is located at a bottom surface of the cradle and the operator identifies the position of the breaker main body by checking the indication sticker attached on the position after moving the breaker main body to the corresponding position. However, the position indication sticker is not easily viewed due to being obscured by the circuit breaker main body, which results in difficulty in the fast and precise recognition of the position of the circuit breaker main body.
Therefore, in order to obviate the problem of the related art, an object of the present invention is to provide a position indicating device for a circuit breaker, by which a position of the circuit breaker can be identified fast and precisely.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a position indicating device including a position indicating plate installed at a lower surface of the movable carriage to be rotatable up and down and having a portion for indicating a position of the breaker main body, an indication supporter installed at the cradle and having stepped pressing surfaces for contacting the position indicating plate, and a frame portion of the movable carriage, the frame portion having windows for externally showing the portion for indicating the position of the breaker main body in accordance to the rotation of the position indicating plate.
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.
In the drawings:
Description will now be given in detail of the present invention, with reference to the accompanying drawings.
Hereinafter, the preferred embodiment of a position indicating device for a circuit breaker according to the present invention will be described with reference to the accompanying drawings. Throughout the description, thickness of each line, a size of each component shown in the drawings may be overdrawn for the brief description and convenience. Also, terms to be explained later may be defined in consideration of functions in the present invention, so the terms may differ depending on a user's intension or an operator's intension or according to custom. Therefore, such terms should be defined based upon the contents over the entire specification of the present invention.
Also, the following embodiment may not limit the scope of the claims of the present invention but be merely illustrative for components disclosed in the to claims of the present invention. Also, the following embodiment may comply with a technical field over the entire specification of the present invention and other embodiments including equivalent components substitutable for the components of the claims can be embraced by the scope of the claims of the present invention.
Description will be given with reference to
Referring to
The reference numeral 107 in
A position indicating device for the circuit breaker according to the present invention may include a position indicating plate 120 installed at a lower surface of the movable carriage 170 to be rotatable up and down and having a portion on which a position of the breaker main body 100 is indicated (informed), an indication supporter 150 installed at the cradle 110 (see
As shown in
Still referring to
The pivot pin 130 may be disposed at the lower surface of the movable carriage 170 to support the position indicating plate 120 rotatable. The return spring 131 may be disposed at the lower surface of the movable carriage 170 to apply an elastic force to the position indicating plate 120 so as to be rotated, namely, biased in one direction (i.e., a clockwise direction in
Also, the position indicating device according to the present invention may further include a bracket 140 having supporting plate portions 141 for supporting both end portions of the pivot pin 130 at the lower surface of the movable carriage 170. Here, the bracket 140 may further include a fixed plate 142 and a restricting plate 143.
The fixed plate 142 may be fixed to the lower surface of the movable carriage 170 and provided with the supporting plate portions 141 extending downwardly from both side surfaces thereof. The restricting plate 143 may face the fixed plate 142 and be disposed in parallel to the supporting plate portions 141. Also, the restricting plate 143 may provide a space in which the position indicating plate 120 is rotatable, and cooperate with the fixed plate 142 to define a rotation range of the position indicating plate 120. In other words, the position indicating plate 120 may be rotatably installed at the supporting plates 141 of the bracket 140 by the pivot pin 130 and rotated within the limited range between the fixed plate 142 and the restricting plate 143 facing each other with an inclination angle. Here, the return spring 131 may include an upper wire 132 supported by the fixed plate 142 and a lower wire 133 supported by the position indicating plate 120. A connection portion between the upper wire 132 and the lower wire 133 may be wound on the pivot pin 130.
As shown in
Still referring to
Here, the pressing plate portion 152 may include a first guiding surface 161 coming in contact with the position indicating plate 120 to guide the position indicating plate 120 to indicate a test position, a second guiding surface 162 connected to the first guiding surface 161 and protruding higher than the first guiding surface 161, and a third guiding surface 163 protruding higher than the second guide surface 162 in a connected state with the second guiding surface 162 and coming in contact with the position indicating plate 120 to guide the position indicating plate 120 to indicate a run position.
Referring to
Hereinafter, description will be given of an operation of the position indicating device for the circuit breaker in accordance with the present invention having such configuration.
As aforementioned, the breaker main body 100 for the circuit breaker according to the one embodiment of the present invention is configured to be movable to a run position at which terminals 104, 105 and 106 of the breaker main body 100 are connected to a power source side terminal and a load side terminal of the cradle 110 and to a test position at which the terminals 104, 105 and 106 of the breaker main body 100 are separated from the power source side terminal and the load side terminal of the cradle 110 so as to allow only testing of a switching operation of the breaker main body 110.
Hence, when the breaker main body 110 is moved to the run position and to the test position with being loaded on the movable carriage 170, the run position and the test position of the breaker main body 110 can be automatically indicated by virtue of the indication supporter 150 provided at the cradle 110, and the position indicating arrow of the position indicating plate 120, which is mounted at the movable carriage 170 and viewed through the windows 171 of the movable carriage 170.
First, in order for an operator to move the breaker main body 100 from a run position to a test position with respect to the cradle 110, the interlock lever provided at the breaker main body 100 is held up to separate the interlock rod 107 from the run position determining groove 111b of the interlock plate 111, and the interlock rod 107 is then inserted into the test position determining groove 111a of the interlock plate 107 disposed at the cradle 110 by pulling out the breaker main body 100 by use of the manipulation handle. Here, the test position designates a position at which the terminals 104, 105 and 106 of the breaker main body 100 are separated from the corresponding power source side terminal and load side terminal of the cradle 110. At the test position, only a switching operation test of the breaker main body 100 is executable in a state of control power being merely supplied. Consequently, the position indicating plate 120 installed at the lower surface of the movable carriage 170 is rotated down based upon the pivot pin 130, by contacting the first guiding surface 161 of the indication supporter 150.
Here, the position indicating arrow of the position indicating plate 120 is appeared through the lower window 171 of the movable carriage 170. That is, the arrow indicates TEST of the marking portions 172 marked at the sides of the windows 171. Therefore, the operator can identify through the window 171 that the breaker main body 100 is located at the test position.
Now, description will be given of an operation that the operator changes a position of the breaker main body 100 from the test position to the run position at which the terminals 104, 105 and 106 of the breaker main body 100 are connected to the power source side terminal and the load side terminal of the cradle 110 so as to be connected to an external circuit between a power source and a load.
The operator holds up the interlock rod 107 to separate the interlock rod 107 from the test position determining groove 111a. Then, if the operator pushes the breaker main body 110 toward the terminals of the cradle 110, the breaker main body 100 is moved towards the terminals of the cradle 110 as wheels of the movable carriage 170 are rolled. Accordingly, the terminals 104, 105 and 106 of the breaker main body 100 are electrically and mechanically connected to the power source side terminal and the load side terminal of the cradle 110, such that the breaker main body 100 is electrically connected to the external circuit between the power source and the load. Here, the interlock rod 107 is inserted into the run position determining groove 111b of the cradle 110.
Accordingly, the position indicating plate 120 attached onto the movable carriage 170 of the breaker main body 100 is rotated based upon the pivot pin 130 to be held up, by contacting the third guiding surface 163 via the second guiding surface 162 of the indication supporter 150. Consequently, the position indicating arrow of the position indicating plate 120 is appeared through the upper window 171 so as to indicate the run position through the window 171. That is, the operator can identify through the window 171 that the circuit breaker is located at the run position.
As described above, the position indicating device for the circuit breaker according to the present invention is configured such that the indication supporter disposed at the cradle and having the first, second and third guiding surfaces and the arrow of the position indicating plate mounted at the movable carriage and rotated based upon the pivot pin disposed at the bracket are employed so as to indicate the test position and the run position through the windows of the frame portion. Therefore, the position of the circuit breaker can be automatically indicated in response to the movement of the breaker main body and accordingly the operator can identify the position of the circuit breaker fast and precisely.
The foregoing embodiments and advantages are merely exemplary and are not to be construed as limiting the present disclosure. The present teachings can be readily applied to other types of apparatuses. This description is intended to be illustrative, and not to limit the scope of the claims. Many alternatives, modifications, and variations will be apparent to those skilled in the art. The features, structures, methods, and other characteristics of the exemplary embodiments described herein may be combined in various ways to obtain additional and/or alternative exemplary embodiments.
As the present features may be embodied in several forms without departing from the characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalents of such metes and bounds are therefore intended to be embraced by the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2008-0138669 | Dec 2008 | KR | national |
