The present disclosure relates generally to the field of current transformers. More specifically, examples of the present disclosure relate to shorting blocks for current transformers.
This section is intended to introduce the reader to various aspects of art that may be related to various aspects of the present techniques, which are described and/or claimed below. This discussion is believed to be helpful in providing the reader with background information to facilitate a better understanding of the various aspects of the present disclosure. Accordingly, it should be understood that these statements are to be read in this light, and not as admissions of prior art.
Current transformers scale a supply current or voltage to a suitable value for a secondary power source or load, such as another transformer and/or a relay. For instance, current transformers may transform a high-voltage current to a level that may be suitable for operation of the secondary power source or load. In some cases, installation and/or maintenance procedures may involve connecting or disconnecting the current transformer from the secondary power source or load. Shorting blocks are utilized to disconnect the current transformer from the secondary power source or load while maintaining the high-voltage current of the current transformer within a closed-loop circuit. In other words, shorting blocks short circuit the current transformer while disconnecting the current transformer from the secondary power source or load. Unfortunately, existing shorting blocks are relatively large and expensive.
Certain examples commensurate in scope with the originally claimed subject matter are discussed below. These examples are not intended to limit the scope of the disclosure. Indeed, the present disclosure may encompass a variety of forms that may be similar to or different from the examples set forth below.
When introducing elements of various embodiments of the present disclosure, the articles “a,” “an,” and “the” are intended to mean that there are one or more of the elements. The terms “comprising,” “including,” and “having” are intended to be inclusive and mean that there may be additional elements other than the listed elements. Additionally, it should be understood that references to “one embodiment” or “an embodiment” of the present disclosure are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features. Furthermore, the phrase A “based on” B is intended to mean that A is at least partially based on B. Moreover, unless expressly stated otherwise, the term “or” is intended to be inclusive (e.g., logical OR) and not exclusive (e.g., logical XOR). In other words, the phrase A “or” B is intended to mean A, B, or both A and B.
In accordance with one example, a shorting block includes a first shorting contact that may be electrically coupled to a first terminal of a current transformer, where the first shorting contact has a first contact portion, a second shorting contact that may be electrically coupled to a second terminal of the current transformer, where the second shorting contact has a second contact portion, and where the first contact portion and the second contact portion may electrically couple the first shorting contact and the second shorting contact in a shorting position of the shorting block, a first activation contact that may be electrically coupled to a load, and a second activation contact that may be electrically coupled to the load, where the first activation contact and the second activation contact may be inserted into the first shorting contact and the second shorting contact, respectively, such that the first activation contact and the second activation contact direct the first contact portion and the second contact portion away from one another to form a gap between the first contact portion and the second contact portion in an operating position of the shorting block.
In accordance with another example, an electric power system includes a current transformer having a primary winding and a secondary winding, a load that may be electrically coupled to the secondary winding of the current transformer, and a shorting block that may couple the current transformer to the load. The shorting block includes a first shorting contact that may be electrically coupled to a first terminal of the current transformer, a second shorting contact that may be electrically coupled to a second terminal of the current transformer, where the first shorting contact and the second shorting contact may contact one another in a shorting position of the shorting block, a first activation contact that may be electrically coupled to the load, and a second activation contact that may be electrically coupled to the load, where the first activation contact and the second activation contact may contact the first shorting contact and the second shorting contact, respectively, to form a gap between the first shorting contact and the second shorting contact in an operating position of the shorting block.
In accordance with another example, a connector for a shorting block includes a body that may be coupled to a current transformer, an overlapping member coupled to the body, a biased portion coupled to the overlapping member via a bent portion, where the overlapping member and the biased portion overlap with one another with respect to a width of the body, a first contact portion coupled to the biased portion, where the biased portion may bias the first contact portion in a direction away from the overlapping member, and a second contact portion coupled to the base, where a gap is formed between the first contact portion and the second contact portion in a shorting position of the shorting block, and where the first contact portion and the second contact portion are electrically coupled to one another in an operating position of the shorting block.
These and other features, aspects, and advantages of the present disclosure will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:
One or more specific examples of the present disclosure will be described below. In an effort to provide a concise description of these examples, all features of an actual implementation may not be described in the specification. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.
As set forth above, current transformers may be utilized to regulate a voltage provided to a secondary power source or load (e.g., a relay, another transformer, an electronic instrument, and/or another power consuming device). For instance, a current transformer may include a primary winding electrically coupled to a high-voltage current and a secondary winding electrically coupled to the secondary power source or load. The high-voltage current of the primary winding of the current transformer may be unsuitable for operation of the secondary power source or load. As such, the current transformer may decrease the voltage in order to provide a reduced-voltage current to the secondary power source or load that is suitable for operation of the secondary power source or load.
During normal operation, the current transformer is electrically coupled to the secondary power source or load via a shorting block to form a closed loop circuit between the current transformer and the secondary power source or load. The shorting block may be utilized to disconnect (e.g., electrically isolate) the current transformer from the secondary power source or load when undergoing maintenance procedures and/or installation of various components. For instance, the shorting block may generally short circuit the current transformer by forming a closed loop between terminals of the current transformer. The shorting block may include an operating position that electrically couples the current transformer to the secondary power source or load as well as a shorting position that disconnects the current transformer from the secondary power source or load while maintaining the current transformer in a closed loop circuit (e.g., electrically coupling the terminals of the current transformer to one another).
Some shorting blocks include shorting contacts, bridging elements, and an actuator. The shorting block may include a pair of shorting contacts where a first shorting contact is electrically coupled to a first terminal of the current transformer (e.g., a first terminal associated with the secondary winding of the current transformer) and a second shorting contact is electrically coupled to a second terminal of the current transformer (e.g., a second terminal associated with the secondary winding of the current transformer). A first bridging element (e.g., a conductive bar or shunt) may be physically coupled to the first shorting contact and be configured to electrically couple the first shorting contact to a first terminal of the secondary power source or load during normal operation. Similarly, a second bridging element (e.g., a conductive bar or shunt) may be physically coupled to the second shorting contact to and be configured to electrically couple the second shorting contact to a second terminal of the secondary power source or load during normal operation.
In the operating position, the first bridging element contacts both the first shorting contact and the first terminal of the secondary power source or load and the second bridging element contacts both the second shorting contact and the second terminal of the secondary power source or load. As such, a closed loop circuit is formed between the current transformer and the secondary power source or load. To transition the shorting block from the operating position to the shorting position, the actuator or actuators (e.g., non-conductive actuators) may be inserted into the first and second shorting contacts to disengage the first and second bridging elements, respectively. The actuator or actuators remove contact between the first shorting contact, the first bridging element, and the first terminal of the secondary power source to electrically decouple the first shorting contact from the first terminal of the secondary power source. Additionally, the actuator or actuators remove contact between the second shorting contact, the second bridging element, and the second terminal of the secondary power source or load to electrically decouple the second shorting contact from the second terminal of the secondary power source or load. Further still, the actuator or actuators may simultaneously bring the first contacting element into contact with the second contacting element to form a closed loop circuit between terminals of the current transformer. As such, the current transformer is short circuited, but remains within a closed loop circuit. Unfortunately, some shorting blocks that include the shorting contacts, the bridging elements, and the actuators may have a relatively large size and be expensive to manufacture.
Accordingly, the present disclosure is directed to an improved and simplified shorting block that has shorting contacts with a reduced length and eliminates the bridging element by utilizing activation contacts (e.g., conductive activation contacts) that transition the shorting block between an operating position and a shorting position. Thus, the shorting block of the present disclosure includes a reduced size and a reduced cost because of the reduced number of components when compared to existing shorting blocks.
For instance, the shorting block may include a pair of shorting contacts configured to directly contact one another in the shorting position. The activation contacts may be inserted into the shorting contacts to form a gap between the shorting contacts (e.g., the shorting contacts do not contact one another) and place the shorting block in the operating position. As such, the activation contacts both remove contact between the pair of shorting contacts and establish an electrical connection between the pair of shorting contacts and the secondary power source or load. In some examples, the shorting contacts may include an overlapping or folded configuration that reduces a size (e.g., length) of the shorting contacts, while ensuring that the shorting contacts are in contact with one another in the shorting position and not in contact with one another in the operating position. The shorting contacts may be inserted into the shorting block as pairs, where a first shorting contact is electrically coupled to a first terminal of the current transformer (e.g., a first terminal of the secondary winding of the current transformer) and a second shorting contact is coupled to a second terminal of the current transformer (e.g., a second terminal of the secondary winding of the current transformer). The shorting contacts may be mirror images of one another, or self-similar, such that both shorting contacts function substantially the same. The shorting contacts may each include a bias that directs the shorting contacts toward one another when positioned in the shorting block. In other words, the bias of the shorting contacts urges the shorting contacts toward one another and into contact with one another. Therefore, the shorting contacts are in contact with one another as a default position upon insertion into the shorting block. As such, when the shorting contacts are in contact with one another, the first and second terminals of the current transformer form a closed loop circuit.
A first activation contact (e.g., a conductive activation contact) is electrically coupled to a first terminal of the secondary power source or load and a second activation contact (e.g., a conductive activation contact) is electrically coupled to a second terminal of the secondary power source or load. The first and second activation contacts may be inserted into the first and second shorting contacts, respectively, to direct the shorting contacts away from a direction of the bias and away from one another to form a gap between the shorting contacts. Therefore, the activation contacts electrically couple the first terminal of the current transformer to the first terminal of the secondary power source or load as well as electrically couple the second terminal of the current transformer to the second terminal of the secondary power source or load. The electrical connection formed between the activation contacts and the shorting contacts forms a closed loop circuit between the current transformer and the secondary power source or load. Therefore, insertion of the activation contacts enables the shorting block to transition from the shorting position to the activation position.
In some examples, the first activation contact may come into physical contact with the first shorting contact before the second activation contact comes into physical contact with the second shorting contact without placing the current transformer in an open circuit. For example, even though the first activation contact comes into physical contact with the first shorting contact before the second activation contact comes into physical contact with the second shorting contact, contact between the shorting contacts may be maintained because of the bias of the shorting contacts, which maintains the current transformer in a closed circuit (e.g., between the terminals of the current transformer). In short, the current transformer does not realize an open state during the transition between the shorting position and the activation position, or vice versa. Examples of the present disclosure are directed to a shorting block that includes fewer components than existing shorting blocks, includes a reduced a size when compared to existing shorting blocks, and is less expensive to manufacture when compared to existing shorting blocks.
With the foregoing in mind,
In some examples, the shorting block 10 may include one or more securement fasteners 24 configured to secure the housing 12 of the shorting block 10 to another component. For example, the shorting block 10 may be positioned in an electrical cabinet and secured to the electrical cabinet and/or a component within the electrical cabinet via the one or more securement fasteners 24. The securement fasteners 24 may block movement of the shorting block 10 with respect to the electrical cabinet, which may reduce inadvertent movement of components within the housing 12 and/or reduce inadvertent disconnection of electrical components of the shorting block 10.
As shown in the illustrated example of
In some examples, the fasteners 22 may include biasing members 66 (e.g., springs) that facilitate coupling the electrical connectors of the current transformer 63 to the first and second shorting contacts 60, 62. For example, the biasing members 66 may exert a biasing force on the fasteners 22 in a direction 68 toward the fastener retainer 16. Therefore, the fasteners 22 may abut or contact the fastener retainer 16 when the fasteners 22 are loosened or not tightened into corresponding openings of the housing 12. A gap or space may be formed between the fasteners 22 and the first and second shorting contacts 60, 62 when the fasteners 22 are abutting or contacting the fastener retainer 16, such that an electrical connector (e.g., a ring terminal) of the current transformer 63 may be disposed in the gap or space between the fasteners 22 and the first and second shorting contacts 60, 62. The fasteners 22 may then be tightened or driven away from the fastener retainer 16 in a direction 70, such that the fasteners 22 pass through openings of the electrical connectors and openings of the first and second shorting contacts 60, 62. The fasteners 22 thus secure the electrical connectors to the first and second shorting contacts 60, 62 and establish an electrical connection between the current transformer 63 and the first and second shorting contacts 60, 62.
The shorting portion 84 of the second shorting contact 62 includes an overlapping member 86, a bent portion 88, a biased portion 90, a first contact portion 92, and a second contact portion 94. As shown in the illustrated example, the overlapping member 86 is positioned at an angle 85 relative to the body 80 of the second shorting contact 62. The angle 85 of the overlapping member 86 may at least partially contribute to a bias of the biased portion 90, which enables the second shorting contact 62 to contact the first shorting contact 60 upon insertion into the housing 12 of the shorting block 10. For instance, the first shorting contact 60 is positioned on a side 96 of the second shorting contact 62 that is adjacent to the biased portion 90, and the angle 85 positions the shorting portion 84 toward the side 96 to facilitate contact between the first shorting contact 60 and the second shorting contact 62. In some examples, the angle 85 may be between 0 degrees and 20 degrees, between 1 degree and 15 degrees, or between 3 degrees and 15 degrees.
The overlapping member 86 and the biased portion 90 are coupled to one another via the bent portion 88. While the bent portion 88 has a substantially linear cross-section in the illustrated example of
In some examples, the first contact portion 92 and the second contact portion 94 are in contact with one another at a contact point 102 before the second shorting contact 62 is disposed within the housing 12 of the shorting block 10. As such, contact between the first shorting contact 60 and the second shorting contact 62 may direct the first contact portion 92 away from the second contact portion 94 and form a gap between the first contact portion 92 and the second contact portion 94. In other examples, the gap between the first contact portion 92 and the second contact portion 94 may be formed prior to disposal of the second shorting contact 62 into the housing 12 of the shorting block 10. As such, the gap may increase in size due to contact between the first shorting contact 60 and the second shorting contact 62 upon assembly of the shorting block 10. The gap between the first contact portion 92 and the second contact portion 94 may facilitate insertion of an activation contact 61 between the first contact portion 92 and the second contact portion 94. In some embodiments, shorting of the shorting block 10 may be integrated into the first shorting contact 60 and the second shorting contact 62 such that shorting occurs prior to insertion and following removal of an activation contact between the first shorting contact 60 and the second shorting contact 62. In still further embodiments, the second contact portion 94 of the second shorting contact 62 may be eliminated, such that the activation contact 61 is configured to establish an electrical connection with only the first contact portion 92.
In some examples, the body 80 may have a raised portion 134 formed by a transition portion 136 of the body 80. The raised portion 134 and/or the transition portion 136 may enable the body 80 to be further secured to the activation plug 14 and/or to accommodate other adjacent features of the shorting block 10. For instance, the transition portion 136 may include an aperture 138 that is configured to at least partially receive the support member 64 of the activation plug 14. The raised portion 134 allows the body 80 to conform to the support member 64, and in some examples, contact a top portion of the support member 64. In other words, the raised portion 134 enables the support member 64 to be at least partially disposed in the aperture 138 without obstructing the second shorting contact 62 within the activation plug 14.
Additionally, the second shorting contact 62 includes a lip 140 that may further secure the second shorting contact 62 within the housing 12. For example, the lip 140 is configured to abut a protrusion, ledge, or other suitable feature within the housing 12 to block movement of the second shorting contact 62 in a direction 142 along the length 100 of the second shorting contact 62. Therefore, the lip 140 further secures the second shorting contact 62 within the housing 12, thereby reducing inadvertent movement of the second shorting contact 62 with respect to the housing 12 and/or inadvertent interruption of an electrical connection between the second shorting contact 62 and the current transformer 63.
In some examples, disposing the first shorting contact 60 and the second shorting contact 62 into the housing may cause the first and second shorting contacts 60, 62 to be in a shorting position. For instance,
The base portion 130 of the second shorting contact 62 and the base portion 176 of the first shorting contact 60 may be disposed within the plug 158. In some examples, a first wall 180 of the plug 158 secures the base portion 130 and blocks movement of the body 80 of the second shorting contact 62. Further, the first wall 180 may apply an opposing force to the base portion 130 in a direction 181 that is opposite of a force applied to the shorting portion 84 by the first shorting contact 60. Similarly, the plug 158 may include a second wall 182 that is configured to secure the base portion 176 and block movement of the body 160 of the first shorting contact 60. Further, the second wall 182 may apply an opposing force to the base portion 176 that is in a direction 183 that is opposite of a force applied to the shorting portion 164 by the second shorting contact 62. As shown in the illustrated example of
Accordingly, the opposing forces applied by the walls 180, 182 enable the shorting portions 84, 164 to contact one another and apply opposing forces to one another. The opposing forces applied to the shorting portions 84, 164 may be sufficient to drive movement of the first contact portions 92, 172 away from the second contact portions 94, 174, respectively. Accordingly, a first gap 184 may be formed between the first contact portion 92 and the second contact portion 94 of the second shorting contact 62 and a second gap 186 may be formed between the first contact portion 172 and the second contact portion 174 of the first shorting contact 60. In some examples, the gap 184 and/or the gap 186 may facilitate insertion of the activation contacts 61 between the first contact portions 92, 172, and the second contact portions 94, 174, respectively. Additionally, the opposing forces applied by the walls 180, 182 establish contact between the shorting portion 84 and the shorting portion 164 at a contact point 188 of the second shorting contact 62 and a contact point 190 of the first shorting contact 60. Therefore, an electrical connection is established between the first shorting contact 60 (e.g., coupled to a first terminal of the current transformer 63) and the second shorting contact 62 (e.g., coupled to a second terminal of the current transformer 63) to form a closed loop circuit between the first terminal of the current transformer 63 and the second terminal of the current transformer 63. The shorting block 10 is thus in a shorting position 191 when the first shorting contact 60 and the second shorting contact 62 are disposed within the plug 158 and the housing 12.
As shown in the illustrated example of
Additionally, when the first activation contact 196 and the second activation contact 198 are engaged with the second shorting contact 62 and the first shorting contact 60, respectively, a gap 218 is formed between the second shorting contact 62 and the first shorting contact 60. In other words, the contact point 188 of the second shorting contact 62 and the contact point 190 of the first shorting contact 60 are not in contact with one another to form the gap 218. As set forth above, the first activation contact 196 and the second activation contact 198 are both electrically coupled to the load 65, and thus, a closed loop circuit is formed between the current transformer 63 and the load 65 when the shorting block 10 is in the operating position 200.
Further still, the current transformer 63 is maintained within a closed loop circuit during insertion of the first activation contact 196 and the second activation contact 198. As a non-limiting example, in some cases, the first activation contact 196 may contact or otherwise engage the second shorting contact 62 before the second activation contact 198 contacts or engages the first shorting contact 60. As such, the first activation contact 196 may be electrically coupled to the first contact portion 92 and/or the second contact portion 94 before the second activation contact 198 contacts one or both of the first contact portion 172 and the second contact portion 174 of the first shorting contact 60. However, the current transformer 63 remains within a closed loop circuit because the contact point 188 of the second shorting contact 62 maintains contact with the contact point 190 of the first shorting contact 60. In other words, the first activation contact 196 may begin to urge the second shorting contact 62 away from the first shorting contact 60, but the biasing force of the shorting portion 164 of the first shorting contact 60 may continue to urge the first shorting contact 60 toward the second shorting contact 62 and maintain contact. Therefore, a closed loop is maintained between the first and second terminals of the current transformer 63 despite the second activation contact 198 not being in contact with the first shorting contact 60. The shorting block of the present disclosure thus enables the current transformer 63 to remain within a closed loop circuit throughout the entire transition between the shorting position and the operating position, and vice versa. The shorting block thus includes a make before break connection, which enables current flow to remain uninterrupted throughout transitions between the shorting position and the operating position.
While the examples of
In still further examples, the shorting block 10 may include a shorting bar in addition to, or in lieu of, direct contact between shorting contacts. For example,
As shown in the illustrated example of
In some examples, the shorting block 10 may include an integrated activation header 280 that facilitates transitioning multiple shorting assemblies 156 between the shorting position 191 and the operating position 200. For example,
Further, the housing 282 of the integrated activation header 280 may include securement features 288 that may engage and secure the first and second activation contacts 196, 198 to the housing 282. In some examples, the securement features 288 include protrusions that may clamp around at least a portion of the first and second activation contacts 196, 198 and secure the first and second activation contacts 196, 198 to the housing 282. For example, the securement features 288 may couple to the first and second activation contacts 196, 198 via a friction interference fit that substantially blocks movement of the first and second activation contacts 196, 198 with respect to the housing 282. Accordingly, the securement features 288 may reduce inadvertent movement of the first and second activation contacts 196, 198, and thus, inadvertent interruption of an electrical connection between the load 65 and the first and second activation contacts 196, 198.
In some examples, the first and second activation contacts 196, 198 may include various features that facilitate coupling the first and second activation contacts 196, 198 to the first and second shorting contacts 60, 62, the activation plugs 14, and/or the integrated activation header 280. For example,
Additionally or alternatively, the first and second activation contacts 196, 198 may include notches 306 that secure the first and second activation contacts 196, 198 to the activation plugs 14 and/or the housing 282 of the integrated activation header 280. For instance, the notches 306 may form a friction interference fit with the openings 42, 44, and/or the openings 284, 286 to block inadvertent movement of the first and second activation contacts 196, 198 with respect to the activation plugs 14 and/or the integrated activation header 280. The notches 306 may include a predetermined depth that secures the first and second activation contacts 196, 198 into the openings 42, 44, 284, and/or 286 while enabling the first and second activation contacts 196, 198 to be removed (e.g., via a tool or application of a force).
Further still, the first and second activation contacts 196, 198 may each include pronged connections 308 that facilitate coupling the first and second activation contacts 196, 198 to the load 65. For instance, the load 65 may include slots or other openings that may receive the pronged connections 308 of the first and second activation contacts 196, 198 and establish an electrical connection to the load 65. In other examples, the load 65 may have other features that enable an electrical connection between the load 65 and the pronged connections 308. In any case, the first and second activation contacts 196, 198 may be removed from the openings 192, 194 of the plugs 158 to transition the shorting block from the operating position to the shorting position.
In some examples, the shorting block 10 of the present disclosure may not include a shorting bar, which may reduce manufacturing costs of the shorting block 10. Moreover, the configuration of the first and second shorting contacts 60, 62 enables the shorting block 10 to include a reduced length and/or width, which reduces a size of the shorting block 10. Utilizing first and second shorting contacts 60, 62 that are mirror-images of one another may also simplify manufacturing of the shorting block, which further reduces costs. Finally, the shorting block 10 of the present disclosure ensures that the current transformer 63 is maintained within a closed loop circuit in the shorting position, in the operating position, and during a transition between the shorting position and the operating position.
The embodiments set forth in the present disclosure may be susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and have been described in detail herein. However, it may be understood that the disclosure is not intended to be limited to the particular forms disclosed. The disclosure is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the disclosure as defined by the following appended claims. In addition, the techniques presented and claimed herein are referenced and applied to material objects and concrete examples of a practical nature that demonstrably improve the present technical field and, as such, are not abstract, intangible or purely theoretical. Further, if any claims appended to the end of this specification contain one or more elements designated as “means for [perform]ing [a function] . . . ” or “step for [perform]ing [a function] . . . ”, it is intended that such elements are to be interpreted under 35 U.S.C. 112(f). For any claims containing elements designated in any other manner, however, it is intended that such elements are not to be interpreted under 35 U.S.C. 112(f).
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