Claims:We claim:
1. A Rib insulator (01) for three phase gas insulated bus bar, the rib insulator (01) consisting of:
a epoxy body (05);
a high tension (HT) insert (02 with integrated HT shield (03) provided at center of the epoxy body (05);
a low tension (LT) insert (04) with compact LT shield (07) provided at both ends of the epoxy body (05); and
wherein the epoxy body (05) has tapered profile from center to end points.

2. The rib insulator (01) as claimed in claim 1, wherein the rib insulator (01) holds bus bar (11) of each phase and supported from grounded metallic enclosure (06).

3. A gas insulated bus bar arrangement for three phase bus bar module, the gas insulated bus bar arrangement consisting:
a grounded metallic enclosure (06) and
three rib insulators (01) where each rib insulator (01) supported at two locations on the grounded enclosure (06), wherein each rib insulator (01) support each phase of HT bus at center via HT insert and at ends via LT insert, wherein compact LT shield (07) of the rib insulator (01) connects the rib insulator (01) to the ground metallic enclosure (06) and maintain uniform electrostatic field across creepage of the rib insulator (01).

4. The gas insulated bus bar arrangement as claimed in claim 3, wherein the epoxy body (05) of the rib insulator (01) has a gas gap (09) from the grounded metallic enclosure (06) to limit surface stress on epoxy body and formed composite insulation.
5. The gas insulated bus bar arrangement as claimed in claim 3, wherein a gaseous gap (10) is provided in between the LT shield (07) and the epoxy body of the rib insulator (01).

6. The gas insulated bus bar arrangement as claimed in claim 3, wherein the compact LT shields (07) are removal type for easy installation of Three phase bus bar arrangement.

7. The gas insulated bus bar arrangement as claimed in claim 3, wherein the gas insulated bus bar arrangement consist three bus bars [11] terminated with either flexible shields (08) and plug-in adapters (12) in equilateral triangle or right angled or any arbitrary angled configuration with uniform electric stress between phase-phase and phase-ground.

8. The gas insulated bus bar arrangement as claimed in claim 3, wherein the rib insulator (01) to hold each phase of the bus bar (11) independently at angled terminals (13), straight terminals (14) with current transfer bridge (15) and current transfer bridge shields (16) extend the current transfer from each phase of bus bar (11) to other insulating medium through support insulator (17) at a predefined angular port (18) located on the grounded enclosure (06).

9. The gas insulated bus bar arrangement as claimed in claim 3, wherein each rib insulator (01) is supported from the grounded metallic enclosure (06) non-concentrically.

10. The gas insulated bus bar arrangement as claimed in claim 3, wherein the three independent phase rib insulators (01) located at a pre-defined angle not essentially right angle and location of the three rib insulators (01) at vertices of equivalent triangle.
11. The gas insulated bus bar arrangement as claimed in claim 3, wherein a gas gap (09) between HT insert (02) of each phase of bus bar and the grounded metallic enclosure (06) is in range 60 to 70 mm for 245 kV voltage.

12. The gas insulated bus bar arrangement as claimed in claim 3, wherein the gas insulated bus bar arrangement has provision for plug-in to other three phase bus bar with suitable plug-in adapters (12).
, Description:A NOVEL RIB INSULATOR ARRANGEMENT TO SUPPORT THREE PHASE BUS BAR OF THE GAS INSULATED SWITCHGEAR
FIELD OF INVENTION
[001] The present invention relates to an improved three phase Gas insulated three in one bus bar module supported by a novel rib insulator integrated with both HT and LT shields used to inter connect the modules of three phase electrical power systems.
BACKGROUND OF THE INVENTION
[002] The three-phase gas insulated bus bar module is used to interconnect three phase electric power systems. This module shall have the provision to make the connection with any type of insulation system through appropriate equipment like bushing. This bus bar module shall also make the inter connection between different three phase gas insulated modules or segregated phase gas insulated modules. The gas insulated bus bar module consists a metallic chamber filled with insulating gas and has need-based multiple ports and are located at a pre-defined angle.
[003] The three-phase gas insulated bus bar module consists a metallic chamber filled with insulating gas and the bus bars are supported by a single insulator concentrically or multiple insulators located radially / non-concentrically with respect to Metallic Chamber. These insulators also associated with suitable end terminations and shields to make the high voltage electric filed more uniform. Most of these support insulators are radially connected or post type with respect to metallic chamber. In some of the conventional bus bar arrangements, each bus bar is supported by multiple post insulators. These post insulators are either single post or tri post type. If it is single post type, there is requirement of minimum two to three post insulators for the support of bus bar at each location of the bus bar enclosure. If we use post insulators of one or two only for the support of bus bar, it may be susceptible to unsymmetrical electro-dynamic forces during shot circuit.
[004] The angularly oriented of terminal connections are required to provide safe working clearances for the rated / test voltages and are essential for efficient current transfer from compact three phase bus bar arrangement to the other insulator medium or other modules of gas insulated switchgear. In practical electric power systems, it is often required to integrate the new gas insulated electric system with existing air insulated electric system. In such circumstances there is a need of suitable system which shall interconnect those two electric systems.
PRIOR ARTs

[005] The present invention relates to three phase common enclosure type gas insulated switchgear, particularly to a three phase common enclosure type gas insulated bus bar module. Gas-insulated bus bars are enclosed in a metal encapsulation that is filled with an insulating gas, e.g., SF6 or N2 or mixture of these gases or mixture with any other compatible gas. With reference to Pat. No. US 7485807 and US20030079906A1, the three bus bars are arranged in a particular orientation and supported by post insulator. The grounded enclosure dimensions’ increase significantly with system voltage depending on post insulator design requirements. In conventional arrangements, post insulator height along with minimum distance between buses decide the grounded enclosure dimensions. In some of the conventional bus bar arrangements pat. No. US 7612293B2, DE 3137783 and US 4404423 each bus bar is supported by post insulator. These post insulators are either single post or tri post type. If it is single post, then there is requirement of minimum two to three post insulators for the support of bus bar at each location. Fig. 1 shows the conventional bus bar arrangements. Following are some of the drawbacks with these arrangements:
[006] If the bus bar arrangement is in a row, the dimensions of enclosure are quite high. Compactness of equipment is limited.
[007] If the bus bar arrangement is in a row, there is a resultant magnetic field on the grounded enclosure and may result to eddy currents for some type of enclosure materials.
[008] If three phase insulator is used to support three phase bus bars, flexibility in the extension of bus is limited.
[009] Rejection rate of three phase insulator or tri post insulator is more than an independent insulator both at production and operation and hence uneconomical.
[0010] Assembly of Multiple post insulators on each phase of three phase bus bar arrangement becomes complex and may result to bulky in size or complex in nature.
[0011] If we use multiple post insulators mounted on plates and located through grounded housing may increase number of leakage points and hence not reliable.
[0012] If we use post insulators of one or two only for the support of bus bar, it may be susceptible to unsymmetrical electro-dynamic forces. Hence, the present patent aims to address the above problems.

OBJECTS OF THE INVENTION
[0013] It is therefore an object of the invention is to propose a non–concentrically arrangement of support Insulators encapsulated in metallic chamber.
[0014] Another object of the invention is to propose a reliable insulator which can support each phase of HT bus bar non–concentrically with respect to grounded metallic chamber.
[0015] Another object of the invention is to propose a three phase gas insulated bus bar with smallest possible distance between bus and the grounded enclosure.
[0016] Another object of the invention is to propose a reliable insulator which can support each phase of HT conductor non–concentrically and provide composite insulation between each phase of bus and nearest ground plane of the enclosure.
[0017] Another object of the invention is to propose a three phase gas insulated bus bar with single support insulator for each bus bar at a particular location.
[0018] A still further object of the invention is to propose a three phase bus bar module with equilateral triangle configuration or right angled configuration or any arbitrary angled configuration in which each phase conductor will be positioned at each vertex of an equilateral triangle or right angle or any pre-defined angle with angular disposition of the phases so that terminal connections in other insulation media shall be maintained with phase-phase and phase-ground electric isolation.
[0019] A further object of the invention is to propose a novel spherical LT shield connecting with support insulator and metallic chamber to maintain uniform electric field.
[0020] A still another object of the invention is to propose a three phase bus bar module with a provision of plug-in to other three phase bus bar or other three phase switchgear modules.
[0021] A still another object of the invention is to provide means for integration of different three phase bus bar modules to establish multiple gas insulated switchgear bays.
[0022] A still another object of the invention is to reduce complexity of manufacturing of bus bar modules
[0023] A still another object of the invention is to reduce outage time to replace three phase bus bar module.
[0024] A still another object of the invention is to reduce assembly time of three phase bus bar assembly.
[0025] A still another object of the invention is to reduce number of leakage points of the compact three phase bus bar assembly.
SUMMARY OF THE INVENTION:
[0026] Accordingly, there is provided the Epoxy moulded Rib insulator non-concentrically in the grounded enclosure and is not supported at shortest distance of the bus bar from enclosure. The developed rib insulator is not cylindrical and supported from two locations on the grounded enclosure. The invented Rib insulator is located non-concentrically with respect to metallic chamber and further all the three phases of the bus bars can be arranged in one grounded metallic chamber with the support of independent rib insulators. The proposed insulator can support each phase of HT conductor non–concentrically and provide composite insulation between each phase of bus and nearest ground plane of the enclosure. The high tension (HT) and low tension (LT) inserts are interior parts of the epoxy Body. Metallic HT insert is commensurated to each bus bar conductor of individual phase along with shield and maintains uniform electric field. While metallic LT insert is used to hold Rib insulator from grounded enclosure. External metallic LT shields are also integrated to LT insert of the rib insulator to maintain uniform electric field and eliminate surface discharges on the rib insulator. By using suitable plug-in adapters different three phase bus bar modules are integrated.
[0027] In another embodiment, a gas insulated bus bar arrangement for three phase bus bar module. The gas insulated bus bar arrangement consisting a grounded metallic enclosure and three rib insulators. Each rib insulator supported at two locations on the grounded enclosure, wherein each rib insulator support each phase of HT bus at center via HT insert at ends via LT insert, wherein compact LT shield of the rib insulator connects the rib insulator to the ground metallic enclosure and maintain uniform electrostatic field across creepage of the rib insulator.
[0028] In an aspect, the epoxy body of the rib insulator has a gas gap from the grounded metallic enclosure to limit surface stress on epoxy body and formed composite insulation.
[0029] In an aspect, a gaseous gap is provided in between the LT shield and the epoxy body of the rib insulator.
[0030] In an aspect, the compact LT shields are removal type for easy installation of Three phase bus bar arrangement.
[0031] In an aspect, the gas insulated bus bar arrangement consist three bus bars terminated with either flexible shields and plug-in adapters in equilateral triangle or right angled or any arbitrary angled configuration with uniform electric stress between phase-phase and phase-ground.
[0032] In an aspect, the rib insulator to hold each phase of the bus bar independently at angled terminals, straight terminals with current transfer bridge and current transfer bridge shields extend the current transfer from each phase of bus bar to other insulating medium through support insulator at a predefined angular port located on the grounded enclosure.
[0033] In an aspect, each rib insulator is supported from the grounded metallic enclosure non-concentrically.
[0034] In an aspect, the three independent phase rib insulators located at a pre-defined angle not essentially right angle and location of the three rib insulators at vertices of equivalent triangle.
[0035] In an aspect, a gas gap between HT insert of each phase of bus bar and the grounded metallic enclosure is in range 60 to 70 mm for 245 kV voltage.
[0036] In an aspect, the gas insulated bus bar arrangement has provision for plug-in to other three phase bus bar with suitable plug-in adapters.
[0037] In order to further understand the characteristics and technical contents of the present subject matter, a description relating thereto will be made with reference to the accompanying drawings. However, the drawings are illustrative only but not used to limit scope of the present subject matter.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
[0038] It is to be noted, however, that the appended drawings illustrate only typical embodiments of the present subject matter and are therefore not to be considered for limiting of its scope, for the invention may admit to other equally effective embodiments. The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system or methods in accordance with embodiments of the present subject matter are now described, by way of example, and with reference to the accompanying figures, in which:
[0039] Figure 1: Conventional insulators arrangements of compact bus bar.
[0040] Figure 2 illustrates structure of Rib insulator, in accordance with an embodiment of the present subject matter;
[0041] Figure 3: illustrates structure of Rib insulator with HT and LT shields, in accordance with an embodiment of the present subject matter;
[0042] Figure 4: illustrates Rib insulator with LT shield and gas gap, in accordance with an embodiment of the present subject matter;
[0043] Figure 5: illustrates Bus bar arrangement with rib insulator and view of composite insulation, in accordance with an embodiment of the present subject matter;
[0044] Figure 6: illustrates compact Bus bar arrangement with rib insulator and integration to segregated phase switchgear module, in accordance with an embodiment of the present subject matter;
[0045] Figure 7: illustrates Three Phase Bus bar arrangement with independent Rib Insulators for Segregated Phase GIS, in accordance with an embodiment of the present subject matter;
[0046] Figure 8: illustrates Three Phase Bus bar arrangement with independent Rib Insulators for Compact three phase GIS, in accordance with an embodiment of the present subject matter; and
[0047] Figure 9: illustrates Three Phase Bus bar arrangement with independent Rib Insulators for multiple GIS bays, in accordance with an embodiment of the present subject matter.
[0048] The figures depict embodiments of the present subject matter for the purposes of illustration only. A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
DETAILED DESCRIPTION OF THE CURRENT INVESTIGATION
[0049] It should be noted that the description and figures merely illustrate the principles of the present subject matter. It should be appreciated by those skilled in the art that conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present subject matter. It should also be appreciated by those skilled in the art that by devising various arrangements that, although not explicitly described or shown herein, embody the principles of the present subject matter and are included within its spirit and scope. Furthermore, all examples recited herein are principally intended expressly to be for pedagogical purposes to aid the reader in understanding the principles of the present subject matter and the concepts contributed by the inventor(s) to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions. The novel features which are believed to be characteristic of the present subject matter, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures.
[0050] These and other advantages of the present subject matter would be described in greater detail with reference to the following figures. It should be noted that the description merely illustrates the principles of the present subject matter. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the present subject matter and are included within its scope.
[0051] A three-phase compact bus consists of three high tension (HT) buses arranged circularly or in equilateral triangle configuration or any angled configuration supported by compact insulator or post insulator or proposed rib insulator. These insulators shall take support from grounded metallic enclosure. The novelty of proposed design is that instead of cost intensified and bulky compact insulator or post insulator with bulky grounded enclosure, a rib insulator is used to support all three phases of compact bus independently.
[0052] Figure 2 illustrates structure of the present rib insulator. The Rib Insulator [01] consists of three parts. First one is HT insert [02] with integrated shield [03]. Second one is low tension (LT) insert [04] or metallic studs. The third one is casted epoxy body [05]. Rib insulators [01] having two ribs and having a tapered profiled from centre i.e., high voltage side to tail, i.e., ground potential. As shown in figure 5, Precisely, the rib insulator [01] gets supported at two locations on the grounded enclosure [06]. These supporting points are located non-concentrically to the grounded enclosure. In other words, joining of two points gives a chord in circular grounded enclosure. Further, length of this chord is less than diameter of the grounded enclosure. The Rib insulator [01] is used to support each phase of HT bus independently on grounded metallic enclosure [06]. It is proposed additional compact LT shield [07] along with the rib insulator [01]. The invented compact LT shield [07] is also made of high conductive material and it is used as a connector between Rib insulator [01] and grounded metallic enclosure [06]. These compact LT shields [07] are of flexible type and can be commensurated to Rib insulator [01] after keeping insulator in position. This type of arrangement helps in ease in assembly of three phase compact bus bar. Electrical stress at the high voltage conductor is controlled using flexible HT shields [08], in particular at open ends. Figure 3 shows the rib insulator with HT and LT shields.
[0053] Referring to figure 3 and 4, The invented Rib insulator body [05] is always on the floating voltage so that its creepage and the gas gap ‘G’ between epoxy body [05] and Grounded enclosure shall be sufficient enough to limit the surface stress on epoxy body [05]. Figure 5 shows Invented Bus bar arrangement with rib insulator and view of composite insulation. In other words, the composite insulation formed by epoxy and gas gap ‘G’ [09] shall be such that the electric field level on rib insulator body shall not be sufficient to create surface discharges. Moreover, creepage formed by rib insulator is sufficiently higher than composite insulation thickness. This helps in improving voltage withstanding capabilities of the Rib insulator [01] and provide good safety margins of the Rib insulators against basic insulation levels. Similarly, the compact LT shield [07] is profiled in such a way that the electrostatic field level at tri-junction point (junction of gas, metal and epoxy insulation) is much less than that E-field level on the insulator body. Figure 4 shows the view of LT shield and gas gap. To limit stress at this junction, the gaseous gap (GG) [10] is created between LT shield and rib insulator. With appropriate gas gap [10], the E-field level at LT shield is controlled significantly. The LT shield is of spherical type and gas gap [10] between spherical LT shield [07] and epoxy body [05] shall be such that the electrical stress on epoxy body is much less than on the epoxy body near high voltage conductor.
[0054] Referring to figure 7, The compact gas insulated bus bar comprises of three bus bars [11] in single grounded metallic enclosure [06]. Three Bus bars [11] are made of high electrical conductivity material to enable efficient current flow with minimal power loss and is insulated from the grounded metallic enclosure [06] with designed insulating gas density. The rib insulator [01] is made of insulating gas compatible filled epoxy material. The rib insulator [01] holds each of the bus bars [11] through plug-in adapter [12] in such a configuration where each bus bar [11] is placed at the vertices of an equilateral triangle or right angled or any arbitrary angle in a grounded metallic enclosure [06] filled with SF6 gas at designed density. The plug-in adapter [12] is made of high electrical conductivity material makes the electrical connection between rib insulator [01] and bus bars [11]. Each of the bus bar [11] is ended with termination shield or flexible HT shield [08], which controls the electric stress between the bus bars [11] and bus bars to the grounded enclosure [06].
[0055] Figure 6 shows invented Three phase common bus bar arrangement with angled and straight terminals extended from each phase of bus bar [11]. The angled terminals [13], straight terminal [14], current transfer bridge [15] and current transfer bridge shields [16] are made of high electrical conductivity material to maintain efficient current transfer with minimal power losses. The straight terminal [14] extends the electrical connection orthogonally from bus bar [11] to other insulation media/module of gas insulated switchgear through support insulator [17]. The insulating medium can be gas or liquid or solid or combination of them.
[0056] Whereas the angled terminals [13] extend the electrical connection radially at a designed angle from bus bars [11] to other insulation media or other modules of gas insulated switchgear through support insulator [17]. The angled terminals [13] are profiled at a designed angle equal to the angle of angular ports [18] on metallic enclosure [06] to keep the uniform electric stresses around the angled terminals [13], between bus bars [11] and between bus bar [11] and grounded metallic enclosure [06]. The angled terminals [13] / straight terminals [14] provide the flexibility in design. These terminals shall rotate radially to the bus bar at any desired angle based on the requirement.
[0057] The three phase gas insulated bus bar [11] with smallest possible distance between bus and the grounded enclosure can be selected with this type of rib insulator [01] arrangement. Here rib insulator [01] is used to support each phase of HT bus bar [11] from the grounded enclosure [06] at two points (surface area can be selected based on requirements) unlike post insulator which is at one-point support from grounded enclosure [06]. Only one rib insulator [01] is good enough to support of each phase of bus bar at a particular location unlike multiple post insulators. Further, to adopt multiple post insulators, it is essential to keep more gas gap from bus bar to grounded enclosure [06]. The three phase gas insulated bus bar arrangement can be used as a gas insulated bus for segregated phase switchgear (refer Figure 7) or it can be extended to compact switchgear where all three phases are in single enclosure (Figure 8).
[0058] In other words, it is possible to extend bus bar connections from each phase of bus bar to the three phase support insulator [19] of the compact switchgear module by means of the straight terminal [14], current transfer bridge [15] and current transfer bridge shields [16]. The bus bar arrangement is such that, it can be used as three phase bus duct by joining grounding enclosures [06] with suitable flanges. At the same time, suitable plug in adapters [12] are used to join gas insulated bus bar sections. The gas insulated bus bar [11] is terminated with flexible shield [08] at its open end to achieve uniform electric field. Figure 9 shows the integration of multiple three phase bus bar modules with suitable bellow or expansion element [20]. This integration is required to establish multiple bays in electrical substations. Current transfer bridges [21] are helpful to integrate bus bars and helps to replace any bus bar enclosure [06] during service or in maintenance of GIS. The bus bars are of modular in nature and lot of ease in manufacturing and assembly.
In another embodiment of the present subject matter:
[0059] It is preferable to have a Rib insulator [01] consisting of profiled HT insert [02] with integrated HT shield [03] and LT insert [04] used to hold bus bar [11] of each phase and supported from grounded metallic enclosure [06]. Only one rib insulator [01] is good enough to support of each phase of bus bar at a particular location unlike multiple post insulators. Further, a compact LT shield [07] used to connect Rib insulator [01] to ground metallic enclosure [06] and maintain uniform electrostatic field across the creepage of rib insulator [01]. Compact LT shields [07] are removal type and helps in easy installation of Three phase bus bar arrangement.
[0060] In an embodiment, a three phase bus bar module with all three phases located in a single enclosure to provide a bus bar system comprising of bus bars [11] terminated with either flexible shields [08] or plug-in adapters [12] in equilateral triangle or right angled or any arbitrary angled configuration with uniform electric stress between phase-phase and phase-ground. A rib insulator [01] to hold each phase of bus bar system independently; angled terminals [13] / straight terminals [14] with current transfer bridge [15] and current transfer bridge shields [16] extend the current transfer from each phase of bus bar [11] to other insulating medium which can be gas or liquid or solid or combination of them through support insulator [17] at a predefined angular port [18] located on grounded enclosure [06].
[0061] A rib insulator [01] to hold each phase of bus bar system independently; Angled terminals [13] / straight terminals [14] with current transfer bridge [15], current transfer bridge shields [16] extend the current transfer from each phase bus bar [11] to other insulating medium or other compact switchgear module (all three phases in single enclosure) through three phase support insulator [19]. The insulation medium can be gas or liquid or solid or combination of them. Each phase of gas insulated bus is supported by independent rib insulator [01] which is supported from grounded metallic enclosure [06] non-concentrically.
[0062] Three independent phase rib insulators [01] located at a pre-defined angle not essentially right angle. The location of these insulators may be even at vertices of equivalent triangle. The gas gap ‘G’ [09] from epoxy body [05] to grounded enclosure [06] controls the electric field across insulator and improves withstand-able voltage. The composite insulation consisting of epoxy and gas insulation is designed such that lowest possible dimensions of gas insulated enclosure [06] can be achieved.
[0063] The composite insulation height is much less than the creepage length as well as radial arcing distance of rib insulator [01]. A reliable insulator [01] which can support each phase of bus bar / HT conductor non–concentrically from the grounded enclosure [06] and provide composite insulation between each phase of bus [11] and nearest ground plane of the enclosure.
[0064] The present subject matter novelty of the proposed design is that the gas gap between HT conductor of each phase of bus bar and the grounded metallic enclosure [06] is much smaller than creepage length/arcing distance of rib insulator [01]. A spherical LT shield connecting rib insulator [01] and grounded enclosure [06] has predefined gas gap ‘GG’ [10] from rib insulator [01] to limit tri junction electric field.
[0065] In an aspect, the gas gap (09) between HT insert (02) of each phase of bus bar and the grounded metallic enclosure (06) is in range 60 to 70 mm for 245 kV voltage. Further, the gas gap depends on system voltage, it may 60 to 70 mm for 245 kV voltage class rib insulator.
[0066] A three phase bus bar module with a provision of plug-in to other three phase bus bar with suitable plug-in adapters [12]. Proposed three phase gas insulated bus bar can be used as gas insulated bus duct or gas insulated transmission line for transmitting electrical power. Integration of three phase gas insulated bus bar module with suitable bellow to establish multiple GIS bays or gas insulated bus duct of required length.
[0067] Although embodiments for the present subject matter have been described in language specific to structural features, it is to be understood that the present subject matter is not necessarily limited to the specific features described. Rather, the specific features and methods are disclosed as embodiments for the present subject matter. Numerous modifications and adaptations of the system/component of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the scope of the present subject matter.