Patent Grant
7905735
This patent application is related to co-pending U.S. patent application Ser. No. 12/072,333, entitled “Separable Connector with Interface Undercut,” filed Feb. 25, 2008; U.S. patent application Ser. No. 12/072,498, entitled “Separable Connector With Reduced Surface Contact,” filed Feb. 25, 2008; U.S. patent application Ser. No. 12/072,164, entitled “Dual Interface Separable Insulated Connector With Overmolded Faraday Cage,” filed Feb. 25, 2008; and U.S. patent application Ser. No. 12/072,193, entitled “Method Of Manufacturing A Dual Interface Separable Insulated Connector With Overmolded Faraday Cage,” filed Feb. 25, 2008. The complete disclosure of each of the foregoing related applications is hereby fully incorporated herein by reference.
The invention relates generally to separable connector systems for electric power systems and more particularly to easier decoupling of separable connector systems.
In a typical power distribution network, substations deliver electrical power to consumers via interconnected cables and electrical apparatuses. The cables terminate on bushings passing through walls of metal encased equipment, such as capacitors, transformers, and switchgear. Increasingly, this equipment is “dead front,” meaning that the equipment is configured such that an operator cannot make contact with any live electrical parts. Dead front systems have proven to be safer than “live front” systems, with comparable reliability and low failure rates.
Various safety codes and operating procedures for underground power systems require a visible disconnect between each cable and electrical apparatus to safely perform routine maintenance work, such as line energization checks, grounding, fault location, and hi-potting. A conventional approach to meeting this requirement for a dead front electrical apparatus is to provide a “separable connector system” including a first connector assembly connected to the apparatus and a second connector assembly connected to an electric cable. The second connector assembly is selectively positionable with respect to the first connector assembly. An operator can engage and disengage the connector assemblies to achieve electrical connection or disconnection between the apparatus and the cable.
Generally, one of the connector assemblies includes a female connector, and the other of the connector assemblies includes a corresponding male connector. In some cases, each of the connector assemblies can include two connectors. For example, one of the connector assemblies can include ganged, substantially parallel female connectors, and the other of the connector assemblies can include substantially parallel male connectors that correspond to and are aligned with the female connectors.
During a typical electrical connection operation, an operator slides the female connector(s) over the corresponding male connector(s). To assist with this operation, the operator generally coats the connectors with a lubricant, such as silicone. Over an extended period of time, the lubricant hardens, bonding the connectors together. This bonding makes it difficult to separate the connectors in an electrical disconnection operation. The greater the surface area of the connectors, the more difficult the connection is to break. This problem is greatly exacerbated when the separable connector system includes multiple connector pairs that must be separated simultaneously.
Conventionally, operators have attempted to overcome this problem by twisting one of the connector assemblies with a liveline tool prior to separating the connectors. The twisting operation can shear interface adhesion between the connectors, allowing the operator to more easily separate the connectors. There are many drawbacks to this approach. For example, the twisting operation may deform the connector assemblies by loosening and unthreading current carrying joints and/or twisting and bending an operating eye of the connector assemblies. This deformation of the connector assemblies can render the connector assemblies ineffective and/or unsafe. In addition, the ergonomics of the twisting operation may result in immediate and long term (i.e., repetitive motion) injury to the operator. Moreover, connector assemblies with multiple, substantially parallel connectors cannot be twisted to break interface adhesion.
Therefore, a need exists in the art for a system and method for safely and easily separating connector assemblies of a separable connector system. In particular, a need exists in the art for a system and method for safely and easily reducing or shearing interface adhesion between connectors of a separable connector system. In addition, a need exists in the art for a system and method for reducing or shearing interface adhesion between connectors of multiple substantially parallel connector pairs of a separable connector system.
The invention provides systems and methods for separating connector assemblies of a separable connector system. The separable connector assemblies include one or more pairs of connectors configured to engage and disengage one another in electrical connection and disconnection operations, respectively. For example, an operator can selectively engage and disengage the connectors to make or break an energized connection in a power distribution network.
In one exemplary aspect of the invention, a first connector assembly is connected to a dead front or live front electrical apparatus, such as a capacitor, transformer, switchgear, or other electrical apparatus. A second connector assembly is connected to a power distribution network via a cable. Joining the connectors of the first and second connector assemblies together closes a circuit in the power distribution network. Similarly, separating the connectors opens the circuit.
For each pair of connectors, a first of the connectors can include a housing disposed substantially about a recess from which a probe extends. For example, the probe can include a conductive material configured to engage a corresponding conductive contact element of a second of the pair of connectors. The second connector can include a tubular housing disposed substantially about the conductive contact element and at least a portion of a tubular member, such as a piston holder, coupled to the conductive contact element. A nose piece can be secured to an end of the tubular housing, proximate a “nose end” of the second connector. The nose piece can be configured to be disposed within the recess of the first connector when the connectors are connected. An outer shoulder of the second connector can be coupled to the tubular housing.
In one exemplary aspect of the invention, an operator can separate the connectors by pushing the connectors together and then pulling the connectors apart. Pushing the connectors together can shear interface adhesion between the connectors, making it easier for the operator to pull the connectors apart. It also can provide a “running start” for overcoming a latching force between the connectors when pulling the connectors apart. For example, relative movement between the connectors during the push portion of this “push-then-pull” operation can be about 0.1 inches to more than 1.0 inches or between about 0.2 inches and 1.0 inches.
The connectors can include clearance regions sized and configured to accommodate this relative movement. For example, the connectors can include a “nose clearance” region sized and configured to accommodate relative movement of the nose end of the second connector and the recess of the first connector during a push-then-pull operation of the first and second connectors. The connectors also may include a “shoulder clearance” region sized and configured to accommodate relative movement of the shoulder of the second connector and the housing of the first connector during the push-then-pull operation. In addition, the connectors may include a “probe clearance” region sized and configured to accommodate relative movement of the probe of the first connector and the tubular member of the second connector during the push-then-pull operation.
In another exemplary aspect of the invention, the connectors can include a latching mechanism for securing the connectors together when they are in a connected operating position. For example, one of the connectors can include a groove, and the other of the connectors can include a latching element configured to engage the groove when the connectors are in the connected operating position. The latching element can include a locking ring, a projection of a finger contact element, such as a finger of the conductive contact element of the second connector, or another securing element apparent to a person of ordinary skill in the art having the benefit of the present disclosure. Similar to the clearance regions described above, the connectors can include a clearance region sized and configured to accommodate relative movement of the groove and the latching element during a push-then-pull operation to disconnect the connectors.
In yet another exemplary aspect of the invention, the nose end of the second connector can include an undercut segment configured not to engage an interior surface of the housing of the first connector when the connectors are engaged. For example, the housing can include a semi-conductive material extending along an interior portion of an inner surface of the housing. Other (non-undercut) segments of the second connector may engage the inner surface of the housing when the connectors are engaged. For example, the undercut segment can be disposed between two “interface segments” configured to engage the interior surface of the first connector when the connectors are engaged. Limiting the surface area of the nose end that interfaces with the interior surface of the other connector reduces surface adhesion and a pressure drop when separating the connectors, making separation easier to perform. For example, the undercut segment can be disposed within the nose piece of the second connector.
These and other aspects, objects, features, and advantages of the invention will become apparent to a person having ordinary skill in the art upon consideration of the following detailed description of illustrated exemplary embodiments, which include the best mode of carrying out the invention as presently perceived.
The invention is directed to systems and methods for safely and easily separating connector assemblies of a separable connector system. In particular, the invention is directed to systems and methods for safely and easily reducing or shearing interface adhesion between connectors of a separable connector system using a push-then-pull operation or a reducing surface contact between the connectors. The separable connector assembly includes one or more pairs of separable connectors configured to engage one another in an electrical connection operation and to disengage one another in an electrical disconnection operation. An operator can disengage the connectors during the electrical disconnection operation by pushing the connectors together and then pulling the connectors apart. Pushing the connectors together shears interface adhesion between the connectors, making it easier for the operator to pull the connectors apart.
Turning now to the drawings, in which like numerals indicate like elements throughout the figures, exemplary embodiments of the invention are described in detail.
The female connector 102 includes an elastomeric housing 110 comprising an insulative material, such as ethylene-propylene-dienemonomoer (“EPDM”) rubber. A conductive shield layer 112 connected to electrical ground extends along an outer surface of the housing 110. A semi-conductive material 190 extends along an interior portion of an inner surface of the housing 110, substantially about a portion of a cup shaped recess 118 and conductor contact 116 of the female connector 102. For example, the semi-conductive material 190 can included molded peroxide-cured EPDM configured to control electrical stress. In certain exemplary embodiments, the semi-conductive material 190 can act as a “faraday cage” of the female connector 102.
One end 114a of a male contact element or probe 114 extends from the conductor contact 116 into the cup shaped recess 118. The probe 114 comprises a conductive material, such as copper. The probe 114 also comprises an arc follower 120 extending from an opposite end 114b thereof. The arc follower 120 includes a rod-shaped member of ablative material. For example, the ablative material can include acetal co-polymer resin loaded with finely divided melamine. In certain exemplary embodiments, the ablative material may be injection molded on an epoxy bonded glass fiber reinforcing pin (not shown) within the probe 114. A recess 124 is provided at the junction between the probe 114 and the arc follower 120. An aperture 126 is provided through the end 114b of the probe 114 for assembly purposes.
The male connector 104 includes a semi-conductive shield 130 disposed at least partially about an elongated insulated body 136. The insulated body 136 includes elastomeric insulating material, such as molded peroxide-cured EPDM. A conductive shield housing 191 extends within the insulated body 136, substantially about a contact assembly 195. A non-conductive nose piece 134 is secured to an end of the shield housing 191, proximate a “nose end” 194 of the male connector 104. The elastomeric insulating material of the insulated body 136 surrounds and bonds to an outer surface of the shield housing 191 and to a portion of the nose piece 134.
The contact assembly 195 includes a female contact 138 with deflectable fingers 140. The deflectable fingers 140 are configured to at least partially receive the arc follower 120 of the female connector 102. The contact assembly 195 also includes an arc interrupter 142 disposed proximate the deflectable fingers 140. The contact assembly 195 is disposed within a contact tube 196.
The female and male connectors 102, 104 are operable or matable during “loadmake,” “loadbreak,” and “fault closure” conditions. Loadmake conditions occur when one of the contacts 114, 138 is energized and the other of the contacts 114, 138 is engaged with a normal load. An arc of moderate intensity is struck between the contacts 114, 138 as they approach one another and until joinder of the contacts 114, 138.
Loadbreak conditions occur when mated male and female contacts 114, 138 are separated when energized and supplying power to a normal load. Moderate intensity arcing occurs between the contacts 114, 138 from the point of separation thereof until they are somewhat removed from one another. Fault closure conditions occur when the male and female contacts 114, 138 are mated with one of the contacts being energized and the other of the contacts being engaged with a load having a fault, such as a short circuit condition. In fault closure conditions, substantial arcing occurs between the contacts 114, 138 as they approach one another and until they are joined in mechanical and electrical engagement.
In accordance with known connectors, the arc interrupter 142 of the male connector 104 may generate arc-quenching gas for accelerating the engagement of the contacts 114, 138. For example, the arc-quenching gas may cause a piston 192 of the male connector 104 to accelerate the female contact 138 in the direction of the male contact 114 as the connectors 102, 104 are engaged. Accelerating the engagement of the contacts 114, 138 can minimize arcing time and hazardous conditions during loadmake and fault closure conditions. In certain exemplary embodiments, the piston 192 is disposed within the shield housing 191, between the female contact 138 and a piston holder 193. For example, the piston holder 193 can include a tubular, conductive material, such as copper, extending from an end 138a of the female contact 138 to a rear end 198 of the elongated body 136.
The arc interrupter 142 is sized and dimensioned to receive the arc follower 120 of the female connector 102. In certain exemplary embodiments, the arc interrupter 142 can generate arc-quenching gas to extinguish arcing when the contacts 114, 138 are separated. Similar to the acceleration of the contact engagement during loadmake and fault closure conditions, generation of the arc-quenching gas can minimize arcing time and hazardous conditions during loadbreak conditions.
In certain exemplary embodiments, the female connector 102 includes a locking ring 150 protruding from the cup shaped recess 118, substantially about the end 114a of the probe 114. A locking groove 151 in the nose piece 134 of the male connector 104 is configured to receive the locking ring 150 when the male and female connectors 102, 104 are engaged. An interference fit or “latching force” between the locking groove 151 and the locking ring 150 can securely mate the male and female connectors 102, 104 when the connectors 102, 104 are electrically connected. An operator must overcome this latching force when separating the male and female connectors 102, 104 during an electrical disconnection operation. A person of ordinary skill in the art having the benefit of the present disclosure will recognize that many other suitable means exist for securing the connectors 102, 104. For example, a “barb and groove” latch, described below with reference to
To assist with an electrical connection operation, an operator can coat a portion of the female connector 102 and/or a portion of the male connector 104 with a lubricant, such as silicone. Over an extended period of time, the lubricant may harden, bonding the connectors 102, 104 together. This bonding can make it difficult to separate the connectors 102, 104 in an electrical disconnection operation. The operator must overcome both the latching force of the locking ring 150 and locking groove 151 and interface adhesion between the connectors 102, 104 caused by the hardened lubricant to separate the connectors 102, 104.
The separable connector system 100 of
Each of the connectors 102, 104 is sized and configured to accommodate the push-then-pull operation. First, the cup-shaped recess 118 of the female connector 102 includes a “nose clearance” region 152 sized and configured to accommodate relative movement of the nose end 194 of the male connector 104 and the cup-shaped recess 118 during the push-then-pull operation. For example, the nose end 194 and/or the cup-shaped recess 118 can move along an axis of the probe 114, with the nose end 194 being at least partially disposed within the nose clearance region 152. In certain exemplary embodiments, an edge 194a of the nose end 194 can abut an end 153 of the cup shaped recess 118, within the nose clearance region 152, when the push portion of the push-then-pull operation is completed, i.e., when the connectors 102, 104 are completely pushed together. For example, an edge of the contact tube 196 and/or an edge of the nose piece 134, proximate the nose end 194 of male connector 104, can abut the end 153 of the cup shaped recess 118 when the push portion of the push-then-pull operation is completed.
Second, the housing 110 of the female connector 102 includes a “shoulder clearance” region 154 sized and configured to accommodate relative movement of a shoulder 155 of the male connector 104 and the housing 110 of the female connector 102 during the push-then-pull operation. For example, the shoulder 155 and/or the housing 110 can move along an axis parallel to the axis of the probe 114, with the shoulder 155 being at least partially disposed within the shoulder clearance region 154. In certain exemplary embodiments, an end 155a of the shoulder 155 can abut an end 156 of the housing 110, within the shoulder clearance region 154, when the push portion of the push-then-pull operation is completed.
Third, the piston holder 193 of the male connector 104 includes a “probe clearance” region 157 sized and configured to accommodate relative movement of the piston holder 193 and the probe 114 of the female connector 102 during the push-then-pull operation. For example, the probe 114 and/or piston holder 193 can move along an axis of the probe 114, with the probe 114 being at least partially disposed within the probe clearance region 157. In certain exemplary embodiments, an end 158 of the arc follower 120 of the probe 114 can abut an end 193a of the piston holder 193, within the probe clearance region 157, when the push portion of the push-then-pull operation is completed.
Fourth, the locking groove 151 in the nose piece 134 of the male connector 104 includes a “latching clearance” region 159 sized and configured to accommodate relative movement of the locking ring 150 of the female connector 102 and the locking groove 151 during the push-then-pull operation. For example, the locking ring 150 and/or locking groove 151 can move along an axis parallel to the axis of the probe 114, with the locking ring 150 being at least partially disposed within the latching clearance region 159. In certain exemplary embodiments, an end 160 of the locking ring 150 can abut an end 161 of the latching groove 151, within the latching clearance region 159, when the push portion of the push-then-pull operation is completed. In certain alternative exemplary embodiments (not illustrated in
A person of ordinary skill in the art having the benefit of the present disclosure will recognize that the clearances described herein are merely exemplary in nature and that other suitable clearances and other suitable means exist for accommodating relative movement between the connectors during a push-then-pull operation.
The relative movement of the connectors 102, 104 during the push-then-pull operation can vary depending on the sizes of the connectors 102, 104 and the strength of the interface adhesion to be sheared when separating the connectors 102, 104. For example, in certain exemplary embodiments, the relative movement of the connectors 102, 104 during the push portion of the push-then-pull operation can be on the order of about 0.1 inches to about 1.0 or more inches. One or both of the connectors 102, 104 can move during the push-then-pull operation. For example, one of the connectors 102, 104 can remain stationary while the other of the connectors 102, 104 moves towards and away from the stationary connector 102, 104. Alternatively, both connectors 102, 104 can move towards and away from one another.
The probe 201 includes a substantially cylindrical member with a recessed tip 203 near a first end of the probe 201. For example, the cylindrical member can include a rod or a tube. In a circuit closing operation, the recessed tip 203 penetrates into and connects with finger contacts 211 of the male connector 231.
The probe 201 includes a recessed area 205, which provides a contact point for interlocking the probe 201 with the finger contacts 211 when the male and female connectors 221, 231 are connected. A first end of each finger contact 211 includes a projection 213 configured to provide a contact point for each finger contact 211 to interlock with the recessed area 205. For example, as the probe 201 is inserted into the finger contacts 211 during an electrical connection operation, the probe 201 can slide into the finger contacts 211 by riding on the projection 213 of each finger contact 211.
Each projection 213 includes a rounded front face and a backside including a ridge angled steeper than the rounded front face. The ridge of the projection 213 is sloped closer to perpendicular to an axis of motion of the probe 201 than the rounded front face of the projection 213. The rounded front face of the projection 213 allows the probe 201 to slide into the finger contacts 211 with minimal resistance and reduced friction. The ridge on the backside of the projection 213 latches the probe 201 into the finger contacts 211. Upon seating of the probe 201 within the finger contacts 211, the ridge of the projection 213 locks into the recessed area 205. The steeper angle of the ridge causes a greater force to be required to remove the probe 201 from the finger contacts 211 than to insert the probe 201 into the finger contacts 211.
When the probe 201 is inserted into the finger contacts 211, the finger contacts 211 expand outwardly to accommodate the probe 201. In certain exemplary embodiments, an external surface of each finger contact 211 includes at least one recessed groove 219 configured to house at least one expandable retention spring 215. The expandable retention springs 215 are configured to restrict flexibility of the finger contacts 211, thereby increasing contact pressure of each finger contact 211. For example, each retention spring 215 can include a flexible, substantially circular member configured to expand or contract based on an applied force.
As with the separable connector system 100 of
Second, a housing 223 of the female connector 221 includes a “shoulder clearance” region 254 sized and configured to accommodate relative movement of a shoulder 255 of the male connector 231 and the housing 223 of the female connector 221 during the push-then-pull operation. For example, the shoulder 255 and/or the housing 223 can move along an axis parallel to the axis of the probe 201, with the shoulder 255 being at least partially disposed within the shoulder clearance region 254. In certain exemplary embodiments, an end 255a of the shoulder 255 can abut an end 256 of the housing 223, within the shoulder clearance region 254, when the push portion of the push-then-pull operation is completed.
Third, a piston holder 232 of the male connector 231 includes a “probe clearance” region 257 sized and configured to accommodate relative movement of the piston holder 232 and the probe 201 of the female connector 221 during the push-then-pull operation. For example, the probe 201 and/or piston holder 232 can move along an axis of the probe 201, with the probe 201 being at least partially disposed within the probe clearance region 257. In certain exemplary embodiments, an end 258 of the probe 201 can abut an end 232a of the piston holder 232, within the probe clearance region 257, when the push portion of the push-then-pull operation is completed.
Fourth, the recessed area 205 of the probe 201 includes a “latching clearance” region 259 sized and configured to accommodate relative movement of the recessed area 205 and the finger contacts 211 of the male connector 231 during the push-then-pull operation. For example, the recessed area 205 and/or finger contacts 211 can move along an axis of the probe 201, with the finger contacts 211 being at least partially disposed within the latching clearance region 259. In certain exemplary embodiments, an end 260 of each finger contact 211 can abut an end 261 of the recessed area 205, within the latching clearance region 259, when the push portion of the push-then-pull operation is completed.
A person of ordinary skill in the art having the benefit of the present disclosure will recognize that the clearances described herein are merely exemplary in nature and that other suitable clearances and other suitable means exist for accommodating relative movement between the connectors during a push operation.
The relative movement of the connectors 221, 231 during the push-then-pull operation can vary depending on the sizes of the connectors 221, 231 and the strength of the interface adhesion to be sheared when separating the connectors 221, 231. For example, in certain exemplary embodiments, the relative movement of the connectors 221, 231 during the push portion of the push-then-pull operation can be on the order of about 0.1 inches to about 1.0 or more inches or between about 0.2 inches and 1.0 inches. One or both of the connectors 221, 231 can move during the push-then-pull operation. For example, one of the connectors 221, 231 can remain stationary while the other of the connectors 221, 231 moves towards and away from the stationary connector 221, 231. Alternatively, both connectors 221, 231 can move towards and away from one another.
In the electrically connected operating position depicted in
An operator can move one or both of the connectors 221, 231 together to the pushed-in position depicted in
Pushing the connectors together, to the pushed-in position depicted in
The female connector assembly 564 includes ganged female connectors 570, 571 that each may be, for example, similar to the female connector 102 illustrated in
In certain exemplary embodiments, the male connector assembly 562 includes stationary male connectors 582, 583 that correspond to and are aligned with the female connectors 570, 571. For example, each of the male connectors 582, 583 may be similar to the male connector 104 shown in
In certain exemplary embodiments, the male connectors 582, 583 can be mounted in a stationary manner to the dead front electrical apparatus. For example, the male connectors 582, 583 may be mounted directly to the dead front electrical apparatus or via a separate mounting structure (not shown). The male connectors 582, 583 are maintained in a spaced apart manner, aligned with the female connectors 570, 571 such that, when the female connectors 570, 571 are moved along the longitudinal axis 560 in the direction of arrow A, the male connectors 582, 583 may be securely engaged to the respective female connectors 570, 571. Likewise, when the female connectors 570, 571 are moved in the direction of arrow B, opposite to the direction of arrow A, the female connectors 570, 571 may be disengaged from the respective male connectors 582, 583 to a separated position.
In certain alternative exemplary embodiments, the female connector assembly 564 may be mounted in a stationary manner to the dead front electrical apparatus, with the male connector assembly 562 being selectively movable relative to the female connector assembly 564. Similarly, in certain additional alternative exemplary embodiments, both the female connector assembly 564 and the male connector assembly 562 may be movable with respect to one another.
The separable connector system 500 of
Second, a housing 523 of each female connector 570, 571 includes a “shoulder clearance” region 554 sized and configured to accommodate relative movement of the housing 523 of the female connector 570, 571 and a shoulder 555 of its corresponding male connector 582, 583 during the push-then-pull operation. For example, the shoulder 555 and/or the housing 523 can move along an axis parallel to the axis of its corresponding probe 514, with each shoulder 555 being at least partially disposed within its corresponding shoulder clearance region 554. In certain exemplary embodiments, an end 555a of each shoulder 555 can abut an end 556 of its corresponding housing 523, within the shoulder clearance region 554, when the push portion of the push-then-pull operation is completed.
Third, a piston holder 532 of each male connector 582, 583 includes a “probe clearance” region 557 sized and configured to accommodate relative movement of the piston holder 532 and the probe 514 of the male connector's corresponding female connector 570, 571 during the push-then-pull operation. For example, each probe 514 and/or piston holder 532 can move along an axis of the probe 514, with the probe 514 being at least partially disposed within the probe clearance region 557. In certain exemplary embodiments, an end 558 of each probe 514 can abut an end 532a of its corresponding piston holder 532, within the probe clearance region 557, when the push portion of the push-then-pull operation is completed.
Fourth, a recessed area 505 of each probe 514 includes a “latching clearance” region 559 sized and configured to accommodate relative movement of the recessed area 505 and finger contacts 511 of the probe's corresponding male connector 582, 583 during the push-then-pull operation. For example, the recessed area 505 and/or finger contacts 511 can move along an axis of the probe 514, with the finger contacts 511 being at least partially disposed within the latching clearance region 559. In certain exemplary embodiments, an end 560 of each finger contact 511 can abut an end 561 of its corresponding recessed area 505, within the latching clearance region 559, when the push portion of the push-then-pull operation is completed.
A person of ordinary skill in the art having the benefit of the present disclosure will recognize that the clearances described herein are merely exemplary in nature and that other suitable clearances and other suitable means exist for accommodating relative movement between the connector assemblies 562, 564 during a push operation.
The relative movement of the connector assemblies 562, 564 during the push-then-pull operation can vary depending on the sizes of the connector assemblies 562, 564 and their corresponding connectors 570, 571, 582, 583, and the strength of the interface adhesion to be sheared when separating the connector assemblies 562, 564. For example, in certain exemplary embodiments, the relative movement of the connector assemblies 562, 564 during the push portion of the push-then-pull operation can be on the order of about 0.1 inches to about 1.0 or more inches or between about 0.2 inches and 1.0 inches.
The female connectors 700 and male connectors 600 are configured to be selectively engaged and disengaged to make or break an energized connection in a power distribution network including the electrical apparatus 705. In certain exemplary embodiments, each male connector 600 can be similar to the male connector 104 shown in
Each male connector 600 includes a semi-conductive shield 608 disposed at least partially about an elongated insulated body 636. The insulated body 636 includes elastomeric insulating material, such as molded peroxide-cured EPDM. A conductive shield housing 632 extends within the insulated body 636, substantially about a contact assembly 620. A non-conductive nose piece 634 is secured to an end of the shield housing 632, proximate a “nose end” 694 of the male connector 600. The elastomeric insulating material of the insulated body 636 surrounds and bonds to an outer surface of the shield housing 632 and to a portion of the nose piece 634.
The contact assembly 620 includes a conductive piston 622, female contact 624, and arc interrupter 628. The piston 622 includes an axial bore and is internally threaded to engage external threads of a bottom portion 624a of the finger contact 624 and thereby fixedly mount or secure the finger contact 624 to the piston 622 in a stationary manner. In certain exemplary embodiments, the piston 622 can be knurled around its outer circumferential surface to provide a frictional, biting engagement with a piston holder 693 to ensure electrical contact therebetween. The piston 622 provides resistance to movement of the finger contact 624 until a sufficient pressure is achieved in a fault closure condition. The piston 622 is positionable or slidable within the shield housing 632 to axially displace the contact assembly 620 in the direction of arrow A during the fault closure condition. For example, arc quenching gas released from the arc interrupter 628 during a fault closure condition can cause the piston 622 to move in the direction of arrow A.
The finger contact 624 includes a generally cylindrical contact element with a plurality of axially projecting contact fingers 630 extending therefrom. The contact fingers 630 may be formed by providing a plurality of slots 633 azimuthally spaced around an end of the female contact 624. The contact fingers 630 are deflectable outwardly when engaged to a probe 715 of a mating, female connector 700 to resiliently engage outer surfaces of the probe 715.
The arc interrupter 628 includes a generally cylindrical member fabricated from a nonconductive or insulative material, such as plastic. In a fault closure condition, the arc interrupter 628 generates de-ionizing, arc quenching gas, the pressure buildup of which overcomes the resistance to movement of the piston 622 and causes the contact assembly 620 to accelerate, in the direction of arrow A, toward the nose end 694 of the male connector 600, to more quickly engage the finger contact element 624 with the probe 710. Thus, movement of the contact assembly 620 in fault closure conditions is assisted by arc quenching gas pressure.
In certain exemplary embodiments, the nose piece 634 is fabricated from a nonconductive material and is generally tubular or cylindrical. The nose piece 634 is fitted onto the nose end 694 of the male connector 600, and extends in contact with an inner surface of the shield housing 632. An external rib or flange 616 is fitted within an annular groove 614 of the shield housing 632, thereby securely retaining the nose piece 634 to the shield housing 632.
A portion of the nose piece 634 extending from an end 636a of the insulated body 636 includes an undercut segment 650 disposed between an outer interface segment 651 and an inner interface segment 652 of the nose piece 634. Each of the interface segments 651, 652 is configured to engage an interior surface of the corresponding female connector 700. For example, each interface segment 651, 652 can be configured to engage semi-conductive material extending along an interior portion of an inner surface of a housing of the female connector 700 (similar to the material 190 illustrated in
The undercut segment 650 can have any depth greater than zero that causes an outside diameter of the undercut segment 650 to be less than an inside diameter of a corresponding segment of an interior surface of the female connector 700. For example, the undercut segment 650 can have a depth of at least about 0.05 inches. By way of example only, in certain exemplary embodiments, the undercut segment 650 can have a depth of about 0.27 inches. The length of the undercut segment 650 can vary, depending on the relative sizes of the connectors 600, 700. For example, the undercut segment 650 can have a length of about 0.625 inches.
In conventional nose pieces, most or the entire outer surface of the portion of the nose piece extending from the end 636a of the insulated body 636 interfaces with the interior surface of the corresponding female connector 700. The traditional motivation for this design was to prevent partial discharge (“PD”) and encourage voltage containment by having the nose piece and other components of the male connector engage the female connector 700 in a form-fit manner. However, as described above, this form-fit relationship made it difficult for an operator to separate the connectors during an electrical disconnection operation.
The exemplary male connector 600 depicted in
This reduction in surface area allows air to rest between the undercut segment 650 and the interior surface of the female connector 700, reducing a pressure drop within the female connector 700 when separating the connectors 600, 700. For example, the reduction in pressure drop can make separation of the connectors 600, 700 easier to perform because less suction works against the operator. The reduction in pressure also can improve switching performance because there is less likelihood of partial vacuum induced flashover. As described below with reference to
In certain exemplary embodiments, the undercut segment 650 also may function as a locking groove, substantially as described above with reference to
In certain alternative exemplary embodiments, the connector 600 may include both an undercut segment 650 and another locking groove (not shown) configured to receive a locking ring (not shown) of the female connector 700. For example, the insulated body 636 proximate the undercut segment 650 may include the locking groove. The locking groove may or may not include a latching clearance region for accommodating a push-then-pull operation.
Specifically, the connector 800 includes a nose piece 834 including an undercut segment 850 without interfacing segments. Thus, no portion of the nose piece 834 will engage an interior surface of a corresponding female connector (not shown in
Although specific embodiments of the invention have been described above in detail, the description is merely for purposes of illustration. It should be appreciated, therefore, that many aspects of the invention were described above by way of example only and are not intended as required or essential elements of the invention unless explicitly stated otherwise. Various modifications of, and equivalent steps corresponding to, the disclosed aspects of the exemplary embodiments, in addition to those described above, can be made by a person of ordinary skill in the art without departing from the spirit and scope of the present invention defined in the following claims, the scope of which is to be accorded the broadest interpretation so as to encompass such modifications and equivalent structures.
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