Claims:We claim:

1. A plug-in type gas insulated transmission line (15) arrangement comprising,
a gas insulated bus bar arrangement having a plurality of gas insulated bus bar ([I-11, II-16, III-19, IV-22, V-23, V1-24, VII-25, VIII-29]);
a multiple section of a plurality of gas insulated bus duct ([I (14), II (21), III (28)] integrated with high tension (HT) bus bar-(I-[11], VI-[24], VIII [29] ) by a rib insulator (01) to support the high voltage bus of the gas insulated transmission line (15) and to reduce number of leakage points of the gas insulated transmission line [15].

2. The plug-in type gas insulated transmission line (15) arrangement as claimed in claim 1, wherein the gas insulated transmission line (15) is configured using a T connector (26) and an angular enclosure (27), wherein the T connector (26) changes orientation either 900 or 2700 in both horizontal and vertical direction, the angular enclosure [27] changes orientation to any arbitrary angled configuration between 10 to 1790 both in horizontal and vertical direction of the gas insulated transmission line (15).

3. The plug-in type gas insulated transmission line (15) arrangement as claimed in claims 1-2, wherein a single bus duct-I [14]) is provided to complete a section of gas transmission insulated line (15) to maintain at same pressure and an assembled bus duct-I [14] having a protection cover which is a gas tight cover to maintain at positive pressure.

4. The plug-in type gas insulated transmission line (15) arrangement as claimed in claims 1-3, wherein integrate includes configure the bus duct - I [14] section to next bus duct -II [21] section through a non-communicable insulator [20];

configure an insulator [20] using similar type of bus duct in one side without rib insulator [01];
configure at each isolated section bus duct –II [21] using same length with end flanges to integrate to non-communicable insulator [20] on one side and other end is integrated with bus duct-I [14] with high voltage bus bar – IV [22];
configure a single isolated section using multiple numbers of bus duct – I [14] for the gas insulated transmission line (15); and
a bus bar- V [23] is used to integrate bus duct-I [14] and bus duct-II [21].

5. The plug-in type gas insulated transmission line (15) arrangement as claimed in claims 1-3, wherein a bus bar-VIII [29] is provided for integration of plurality of the bus ducts (I [14], III [28]);
a provision for plug-in with suitable plug-in adapters (12) of the rib insulator [01] on either side of the bus duct-I [14];
an enclosure is designed for a pre-defined length of bus duct (I [14], III [28]), used with or without compact LT shields [07] to hold the rib insulator [01]; and
the number of rib insulators [01] is limited by using gas insulated bus duct -III [28] which is transported with HT conductor and protective cover.

6. A rib insulator (01) for gas insulated transmission line (15), the rib insulator (01) comprising of:
a high tension (HT) insert (02) with integrated HT shield (03), a low tension (LT) insert (04) configured to hold a high voltage conductor (08) of each phase and supported from grounded metallic enclosure (06);
a compact LT shield (07) of the rib insulator (01) is a substantially spherical LT shield that connects the rib insulator (01) to ground metallic enclosure (06) which has a predefined gas gap ‘GG’ (10) from the rib insulator (01) to limit tri junction electric field and maintain uniform electrostatic field across the creepage of the rib insulator (01); wherein
the rib insulator (01) is configured to hold high voltage bus bar-(I-[11], VI-[24], VIII [29] ), has provision for plug-in with plug-in adapters [12] and to support a high voltage bus bar (11) at a location.

7. A gas insulated bus duct arrangement for the gas insulated transmission line, the gas insulated bus duct arrangement comprising of:
a gas insulated bus duct- I [14] comprises of a two conical straight sections (14A) joined by a straight tube (14B) which consists of a high voltage conductor or bus bar - I [11] supported by the rib insulator [01] at either end in the region of straight conical section [14A];
a moisture absorbent envelope [14C] for maintenance of the high voltage conductor or bus bar - I [11] and retain moisture absorbents inside the bus duct-I [14];
a bus bar-I (11) is positioned between two rib insulators (01) and a plug-in adapter (12) is fixed to the rib insulator (01); wherein
the gas insulated transmission line [15] is an integration of multiple sections of gas insulated bus ducts [14] with modular approach to build kilometers length.

8. The gas insulated bus duct arrangement as claimed in claim 7, wherein plug-in type gas insulated bus duct (14) sections with support insulators forms the plug-in type gas insulated transmission line [15] and to assemble gas insulated bus duct-I [14] with support rib insulators [01] at manufacturing site is transported in assembled condition and the rib insulators [01] provided to limit outage time during maintenance.

9. The gas insulated bus duct arrangement as claimed in claim 7 or 8, wherein an expansion joint-I [17] is positioned at regular distances of the bus ducts I [14] and a current transfer bridge [18] is integrated in the bus bars [19A, 19B] on either side of plugged in the rib insulator [01] and to replace bus duct-I [14] during service or in maintenance of gas insulated transmission line.

10. The gas insulated bus duct arrangement as claimed in claim 7 to 9, wherein the expansion joint-I [17] is provided to dismantle gas insulated bus duct-I [14] sections during maintenance service with lower outages times and has a provision to include multiple gas filling ports, gas measuring ports and isolated sections of gas pressure and comprises a non-permeable insulator [20] with HT shields [20A] located at a predefined length as per requirements to isolate the gas pressure monitoring sections, wherein integration of the bus ducts (II [21], I [14]) is facilitated by the rib insulator (01) and non-communicable insulator through the expansion joint -I [17].
, Description:FIELD OF INVENTION
[001] The present invention relates to a plug in type gas insulated transmission line with plug in type bus bar supported by a novel rib insulator integrated with both HT and LT shields. In particular, the present invention relates to gas insulated bus duct, particularly to a single phase common enclosure type gas insulated transmission line.

BACKGROUND OF THE INVENTION

[002] The bus bar module make the inter connection between different three phase gas insulated modules or segregated phase gas insulated modules. The gas insulated bus duct module consists a metallic chamber filled with insulating gas and has need-based multiple ports and are located at a pre-defined angle. The gas insulated bus duct module consists of a metallic chamber filled with insulating gas and the bus bar is 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 short circuit current.

[003] The gas insulated transmission line is formed by integrating gas insulated bus ducts with suitable sealing systems. There are generally different types of insulators are used to support and separate these gas insulated bus ducts. These insulators may be post type or cone insulator or cylindrical insulators. The cone and cylindrical insulators can be communicated or non-communicated type. The bus bars of gas insulated bus ducts are integrated using suitable bus bar adapters. The orientation of gas insulated bus ducts can be modified by using angled enclosure modules.

[004] 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. Existing prior arts such as patent no. EP2922162A1 and US4591655A describes about bus bar of each bus duct which is supported by cone insulator with sealing on either side. While forming gas insulated transmission line with this arrangement, many number of cone insulators are required and cost of system increases. Further gas leakage rate is more.

[005] Publication no. US2016014854A1 describes post insulators that are mounted on plates at regular distances, installed externally from outside of bus duct and located through grounded housing may increase number of leakage points and hence not reliable. The grounded enclosure dimensions’ increase significantly with system voltage depending on post insulator design requirements. In conventional arrangements, post insulator height decides the grounded enclosure dimensions. In some of the conventional bus bar arrangements pat. No. US 7612293B2, DE3137783 and US4404423A each bus bar is supported by post insulator. With reference to patent no. WO2006013584, bus bar is supported by multiple post insulators and incur more cost and may become unreliable technically and economically. The 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. Following are some of the drawbacks with these arrangements:
? Assembly of multiple post insulators on high voltage bus bar arrangement becomes complex and may result to bulky in size or complex in nature.
? If we use multiple post insulators mounted on plates at regular distances, installed externally from outside of bus duct and located through grounded housing may increase number of leakage points and hence not reliable both technically and economically.
? If we use post insulators of one or two only for supporting of bus bar, it may be susceptible to unsymmetrical electro-dynamic forces.
? If we use cone or cylindrical insulators, it becomes costly and unreliable system. Further, gas leakage rate of system is more.

[006] The present invention is directed to address the above problems

OBJECTS OF THE INVENTION

[007] It is therefore a principal object of the present invention is to propose a concentrically supported insulators encapsulated in metallic chamber.

[008] Another object of the present invention is to propose an insulator which could support HT bus bar concentrically with respect to grounded metallic chamber.

[009] Another object of the present invention is to propose an insulator which could support HT conductor concentrically and provide composite insulation between bus and ground plane of the enclosure.

[0010] Another object of the present invention is to propose a spherical HT and LT shield connecting with support insulator and metallic chamber to maintain uniform field.

[0011] A still another object of the invention is to provide means for integration of bus bar modules of gas insulated bus ducts to establish gas insulated transmission line.

[0012] A still another object of the invention is to reduce complexity of assembly of gas insulated transmission line

[0013] A still another object of the invention is to remove multiple seals between sections of gas insulated transmission line.

[0014] A still another object of the invention is to limit / remove cylindrical and cone insulators with seals between sections of gas insulated transmission line.

[0015] A still another object of the invention is to reduce number of leakage points of the gas insulated transmission line.

[0016] A still another object of the invention is to be able to dismantle gas insulated bus duct sections during service for maintenance with lower outages times.

[0017] A still another object of the invention is to have provision to keep multiple gas filling ports and gas measuring ports and isolated sections of gas pressure.

[0018] A still another object of the invention is to assemble gas insulated bus duct with support insulators at manufacturing works and transport easily in assembled condition.

[0019] A still another object of the invention is to plug-in gas insulated bus duct sections with support insulators to form gas insulated line.

[0020] A still another object of the invention is to provide expansion joint between gas insulated bus duct sections for maintenance of gas insulated line.

[0021] A still another object of the invention is to provide non-communicating insulator between gas insulated bus duct sections of pre-defined length of about 100 meters for maintenance and also to maintain different gas pressure monitoring sections.

[0022] A still another object of the invention is to provide non-communicating insulator along with expansion joint between gas insulated bus duct sections of pre-defined length of about 100 meters for maintenance and to maintain different gas pressure monitoring sections.

[0023] A still another object of the invention is to provide different high voltage plug-in bus bars between gas insulated bus duct sections for their ease in assembly and maintenance and limit outage time during maintenance.

[0024] A still another object of the invention is to plug-in gas insulated bus duct sections with limited support insulators to form gas insulated line.

[0025] A still another object of the invention is the proposed gas insulated bus duct sections configured in any orientation to form gas insulated transmission lines in restricted areas.

[0026] A still another object of the invention is the proposed gas insulated bus duct sections alternatively used as gas insulated bus to connect the gas insulated bay modules.

[0027] These and other objects and advantages of the present subject matter will be apparent to a person skilled in the art after consideration of the following detailed description taken into consideration with accompanying drawings in which preferred embodiments of the present subject matter are illustrated.

SUMMARY OF THE INVENTION

[0028] This summary is provided to introduce concepts relates to improved gas insulated transmission line with bus bar supported by a rib insulator integrated with both HT and LT shields.

[0029] The present invention relates to a plug-in type gas insulated transmission line with bus bar integrated supported by a rib insulator. The rib insulator consisting of a high tension (HT) insert with integrated HT shield, a low tension (LT) insert configured to hold a high voltage conductor of each phase and supported from grounded metallic enclosure. A compact LT shield of the rib insulator connects the rib insulator to ground metallic enclosure and maintain uniform electrostatic field across the creepage of the rib insulator. A plurality of gas insulated bus duct is supported at two locations on the grounded enclosure. The rib insulator further configured to hold high voltage bus bar, integrated through plug-in adapters and support a high voltage bus bar (11) at a preferred location.

[0030] In one embodiment the gas insulated transmission line is an integration of multiple sections of gas insulated bus ducts with modularity supporting HT bus bar by rib insulator, expansion joint in between, provision to keep non-communicable insulators at regular lengths, provision to transport each bus duct section, dismantling of bus ducts during maintenance, provision with plug-in arrangement and finally for extending kilometres length with modular approach.

[0031] In an aspect epoxy moulded Rib insulator concentrically in the grounded enclosure and is supported at either end of the bus bar. The developed rib insulator is not cylindrical and supported from two locations concentrically on the grounded enclosure. By using suitable plug-in adapters gas insulated lines are integrated. The proposed gas insulated line having a provision to integrate with rib insulator and with non-communicable insulator at predefined transmission line length to isolate the bus duct sections. The integration of bus duct sections with limited number of rib insulators and as per required orientation using 0 to 179 degrees angled enclosure modules for development of gas insulated transmission line is proposed.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

[0032] 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, 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 or structure 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:

[0033] FIG. 1 is a conventional insulators arrangements of gas insulated lines;

[0034] FIG. 2 conventional gas insulated lines;

[0035] FIG. 3 shows a rib insulator in an embodiment of the present invention;

[0036] FIG. 4 shows a bus duct arrangement with rib insulator in an embodiment of the present invention;

[0037] FIG. 5 shows an integration of bus ducts supported by the rib insulator arrangement in an embodiment of the present invention;

[0038] FIG. 6 shows an integration of bus ducts supported by the rib insulator arrangement through expansion joint in an embodiment of the present invention;

[0039] FIG. 7 shows an integration of bus ducts supported by the rib insulator and non-communicable insulator arrangement in an embodiment of the present invention;

[0040] FIG. 8 shows an integration of bus ducts supported by rib insulator and non-communicable insulator arrangement through expansion joint in an embodiment of the present invention;

[0041] FIG. 9 shows an integration of gas insulated transmission line using T connector and angular enclosure in an embodiment of the present invention;

[0042] FIG. 10 shows a gas insulated transmission line with same bus duct sections in an embodiment of the present invention; and

[0043] FIG. 11 shows a gas insulated transmission line with limited rib Insulators in an embodiment of the present invention.

[0044] 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.

DETAIL DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE PRESENT INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS

[0045] While the embodiments of the disclosure are subject to various modifications and alternative forms, specific embodiment thereof have been shown by way of example in the figures and will be described below. It should be understood, however, that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the scope of the disclosure.

[0046] The terms “comprises”, “comprising”, or any other variations thereof used in the disclosure, are intended to cover a non-exclusive inclusion, such that a device, system, assembly that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such system, or assembly, or device. In other words, one or more elements in a system or device proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or device.

[0047] The present invention relates to a rib insulator [01] which is used to support the high voltage bus of gas insulated transmission line.

[0048] FIG. 1 is the conventional insulators arrangements of gas insulated lines. The gas insulated transmission line i.e. multiple numbers of gas insulated bus ducts consists of high tension (HT) gas insulated bus supported by cylindrical insulator or cone insulator or post insulator. FIG. 1 shows shematic electric diagram of three phase bus bar, side perspective view of three phase bus, segregated phase bus and a tri post insulator.

[0049] FIG. 2 shows the conventional gas insulated lines and the support insulators. The support insulators take support from grounded metallic enclosure. The conventional support insulators like cylindrical and cone insulators or post insulator are cost intensified and bulky.

[0050] FIG. 3 shows a rib insulator [01] in an embodiment of the present invention. In a preferred embodiment the rib insulator [01] consists of a HT insert [02] with integrated shield [03], a low tension (LT) insert [04] or metallic studs, and a casted epoxy body [05]. The rib insulators [01] having two ribs and having a tapered profiled from centre i.e., high voltage side to tail, i.e., ground potential. The rib insulator [01] is supported at two locations on the grounded enclosure [06]. The supporting points are located concentrically to the grounded enclosure [06]. The rib insulator [01] with HT and LT shields [03,07] is shown in FIG.3

[0051] In one embodiment a compact LT shield [07] along with the rib insulator [01] is proposed to achieve uniform electric field. The LT shield [07] is a stud which is made of high conductive material and used as a connector between the rib insulator [01] and the grounded metallic enclosure [06]. The LT shield [07] is of flexible type and commensurated to the rib insulator [01] after fixing insulator in position. In a preferred embodiment the rib insulator [01] is used to support HT bus [08] on grounded metallic enclosure [06]. Electrical stress at the high voltage conductor or HT bus [08] is controlled using flexible HT shields [09], in particular at open ends (i.e) used as GIS bus.

[0052] In one embodiment the rib insulator body [05] is always on the floating voltage such that creepage and the gas gap between high voltage conductor [08] and LT shield [07] is sufficient enough to limit the surface stress on epoxy body [05]. In a preferred embodiment, the composite insulation formed by epoxy and gas gap ‘G’ [09] is such that the electric field level on the rib insulator [01] body is not sufficient to create surface discharges and creepage formed by the rib insulator [01] is sufficiently higher than composite insulation thickness. This feature helps in improving voltage withstanding capabilities of the rib insulator [01] and provide safety margins of the rib insulators [01] against basic insulation levels. The stud cum 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. To limit electrical stress at this junction, the gaseous gap (GG) [10] is created between LT shield and the rib insulator [01]. With appropriate gaseous gap (GG) [10], the E-field level at LT shield [07] is controlled significantly. The LT shield [07] is of spherical type and gas gap [10] between spherical LT shield [07] and epoxy body [05] is such that the electrical stress on epoxy body is much less than on the epoxy body near high voltage conductor.

[0053] In one embodiment the gas insulated bus duct [14] comprises of bus bar [11] in grounded metallic enclosure [06] supported through rib insulator [01] at either end. High voltage bus bars [11] are made up 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. In a preferred embodiment the rib insulator [01] is made of insulating gas compatible filled epoxy material. The rib insulator [01] holds each of the bus bar - I [11] through plug-in adapter [12] in such a configuration grounded metallic enclosure [06] filled with SF6 gas at designed density. The plug-in adapter [12] is made of high electrical conductivity material that makes the electrical connection between rib insulator [01] and bus bar -I [11]. The bus bar - I [11] is fitted with high conductivity material or copper fit [13] inside bus bar pipe, which helps to carry more current at current transfer regions.

[0054] In one embodiment the gas insulated bus duct [14] consists of HT bus bar - I[11] supported at two points (surface area is selected based on requirements) from the grounded enclosure [06] by using the rib insulator [01]. Only one rib insulator [01] is configured to support of each phase of bus bar at a particular location. To adopt multiple post insulators, it is essential to provide more gas gap from bus bar to grounded enclosure [06].

[0055] FIG. 4 shows a bus duct [14] arrangement with rib insulator [01] in an embodiment of the present invention. The gas insulated bus duct [14] consists of two conical straight sections [14A] joined by straight tube [14B] consists of high voltage conductor or bus bar - I [11] supported by the rib insulator [01] at either end in the region of straight conical section [14A]. The gas insulated bus duct [14] is facilitated with maintenance window. A moisture absorbent envelope [14C] is used for maintenance of the bus bar and also retain moisture absorbents inside the bus duct. In a preferred embodiment the rib insulator [01] is provided with a plug-in adapter [12] which has a provision of plug-in connection. Between two rib insulators [01], bus bar-I [11] is plugged into plug-in adapter [12] fixed to the rib insulator [01]. In a preferred embodiment the gas insulated transmission line [15] is an integration of multiple sections of gas insulated bus ducts [14] with modularity. The gas insulated bus duct [14] with rib insulator [01] is shown in FIG.4.

[0056] FIG. 5 shows an integration of bus duct- I [14] supported by the rib insulator [01] arrangement in an embodiment of the present invention. In a preferred embodiment to configure the gas insulated transmission line [15] multiple bus ducts [14] are integrated with suitable HT bus bar i.e. bus bar-II [16]. In a preferred embodiment the bus duct - I [14] is configured with modular approach to build transmission lines of kilometre length. In one embodiment two approaches are carried with difference in assembly time and in a cost effective manner. In the first approach a single bus duct configuration, i.e., bus duct- I [14] is used for complete section of gas insulated line which maintains at same pressure. In this approach, all gas insulated bus duct sections [14] are same in design. All assembled bus ducts [14] are transported to site with protection covers or gas tight cover which maintains at positive pressure for ease in transportation. The bus duct –I [14] enclosures are integrated directly with a sealing arrangement. To integrate HT connections, special bus i.e. bus bar – II [16] is used which is plugged into plug-in adapter [12] of the rib insulator [01] on either side. The bus duct is of same type for entire length up to 100 meters as isolated section. The integration of bus duct –I [14] supported by the rib insulator [01] arrangement is shown in FIG.5.

[0057] FIG. 6 shows an integration of bus ducts I [14], supported by rib insulator [01] arrangement through expansion joint [17] in an embodiment of the present invention. In a preferred embodiment for maintenance of the bus ducts i.e., bus duct -I [14], an expansion joint-I [17] is configured at regular distances. The expansion joint-I [17] compensates thermal expansions and dimensional discrepancies obtain at site installations. Current transfer bridges [18] are used to integrate bus bars and also used as a replacement of any bus duct-I [14] during service or in maintenance of GIS. The special HT connections i.e. bus bar-III [19A, 19B] on either side plugged in the rib insulator and are joined using the current transfer bridge [18]. Proper shields [19] are provided to the current transfer bridge [18] so that electrostatic field is maintained uniform around the bridge. The bus duct - I [14] is provided with a sealing provision to match to the both gas insulated bus duct-I [14] between which expansions joint-I [17] is configured. The integration of bus duct –I [14] supported by rib insulator [01] arrangement through expansion Joint-I [17] is shown in FIG.6.

[0058] FIG. 7 shows an integration of bus ducts I [14], II [21] supported by rib insulator [01] and non-communicable insulator [20] arrangement in an embodiment of the present invention. In a preferred embodiment to isolate the pressurized sections, a non-communicable or non-permeable insulator [20] with HT shields [20A] is positioned at every 100 meters or predefined length as per requirements. The bus duct - I [14] section is integrated to next bus duct -II [21] section through non-communicable insulator [20]. To accommodate insulator [20], the bus duct of same type is used with one side without rib insulator [01] provision. At each isolated section, bus duct –II [21] of same length with end flanges are configured to integrate to non-communicable insulator [20] on one side and other end it is integrated with bus duct-I [14] with high voltage bus bar – IV [22]. Multiple numbers of bus duct – I [14] are used in a single isolated section of gas insulated transmission line. Special conductor i.e. bus bar- V [23] is used to integrate bus duct-I [14] and bus duct-II [21].

[0059] FIG. 8 shows an integration of bus ducts I [14], II [21] supported by rib insulator [01] and non-communicable insulator arrangement through expansion joint I [17] in an embodiment of the present invention. In a preferred embodiment the expansion joint -I [17] is provided along with non-communicable insulator [20] (at the end of each isolated pressure section). The sealing surfaces of expansion joint -I[17] is such that the non-communicable insulator [20] is placed on second side facing the bus duct-II [21] and first side is connected to the bus duct-I [14]. In a preferred embodiment the conductor is a bus bar – VI [24] which is plugged from the rib insulator [01] on the bus duct – I [14]. Another bus bar – VII [25] is plugged from non-communicable insulator [20] of bus duct – II [21]. The conductors VI [24], VII [25] are joined by a current transfer bridge [18].

[0060] FIG. 9 shows an integration of gas insulated transmission line using T connector [26] and an angular enclosure [27] in an embodiment of the present invention. In one embodiment the orientation of gas insulated transmission line to required configuration is achieved by using T connector [26] or by using angular enclosure [27]. The T connector [26] is used to change the orientation of transmission line for either 900 or 2700 in both horizontal and vertical direction. The angular enclosure [27] is fixed to change orientation to any angle between 10 to 1790 (example 300, 450, 600, 1200, 1350 are standard used) both in horizontal and vertical direction. The integration of gas insulated transmission line using T connector [26] and angular enclosure [27] is shown in FIG. 9

[0061] FIG. 10 shows a gas insulated transmission line with same bus duct sections –I [14] in an embodiment of the present invention. In a preferred embodiment to form gas insulated transmission line [15], multiple bus ducts-I [14] are integrated with suitable HT connection. The bus duct are configured with modular approach to build transmission lines of kilometer length.

[0062] In another approach, it is to use multiple bus duct design for complete section of gas insulated line which maintains at same pressure. In this approach gas insulated bus duct sections are same in length with different in design. One type of bus ducts i.e. bus duct-I [14] are only transported with assembly. The bus duct-III [28] is transported with HT conductor and dummy insulators are used as a protective cover. All assembled bus ducts are transported to site with protection covers or gas tight cover with positive gas pressure for ease in transportation and storage. To integrate these two types of bus ducts [14],[28] another bus bar-VIII [29] is used that is plugged into plug-in adapter [12] of rib insulator [01] on either side. The bus duct enclosure is same for entire length preferably up 100 meters as isolated section only bus ducts are with and without studs cum LT shields [07] to hold rib insulator [01]. The bus bars are of modular in nature and ease to manufacture and assemble.

[0063] FIG. 11 shows a gas insulated transmission line with limited rib insulators [01] in an embodiment of the present invention. In a preferred embodiment as part of plug-in reduced number of rib insulators [1] are preferred. Two types of bus ducts are used. The first type of gas insulated bus duct i.e. bus duct – I[14] consists of two conical straight sections [14A] joined by straight tube [14B] consists of high voltage conductor (i.e.) bus bar-I [11] supported by the rib insulator [01] at either end in the region of straight conical section. The rib insulator [01] is provided with a plug-in adapter [12] which has a provision of plug-in. Between two rib insulators [01], bus bar-I [11] is plugged into plug-in adapter [12] and fixed to the rib insulator [01].

[0064] In one embodiment another type of gas insulated bus duct i.e. bus duct-III [28] which consists of two conical straight sections [28A] is joined by straight tube [28B]. The selected bus duct has no supports/LT shields [07] which is required to keep rib insulator [01]. The two rib insulators [01] are reduced for every two bus ducts. The rib insulator [01] is provided with a plug-in adapter [12]. Between two rib insulators [01] of two bus duct-I [14] sections bus duct-III [28] section is provided without rib insulator [01] and bus bar-VIII [29] is plugged into plug-in adapter [12] fixed to the both rib insulators [01] on either side.

[0065] In one embodiment the gas insulated transmission line (15) is an integration of multiple sections of gas insulated bus ducts (14) with modularity supporting HT bus bar (08) by the rib insulator (01), expansion joint - I [17] in between, provision to integrate non-communicable insulators (20) at regular lengths, provision to transport each bus duct section, dismantling of bus ducts during maintenance, provision with plug-in arrangement and finally for extending kilometres length with modular approach.

[0066] In one embodiment epoxy moulded rib insulator (01) concentrically in the grounded enclosure (06) and is supported at either end of the bus bar. The developed rib insulator is not cylindrical and supported from two locations concentrically on the grounded enclosure. By using suitable plug-in adapters (12) gas insulated lines are integrated. The proposed gas insulated line has provision to integrate with rib insulator (01) and with non-communicable insulator (20) at predefined transmission line length to isolate the bus duct sections. The integration of bus duct sections with limited number of rib insulators (01) and as per required orientation using 10 to 1790 angled enclosure modules for development of gas insulated transmission line (15) is proposed.

[0067] 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. 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.

[0068] 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. The present invention will now be described more specifically with reference to the following specification.

[0069] 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.

[0070] Although embodiments for the present subject matter have been described in language specific to package 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/device 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.

[0071] It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”

[0072] It will be further appreciated that functions or structures of a plurality of components or steps may be combined into a single component or step, or the functions or structures of one-step or component may be split among plural steps or components. The present invention contemplates all of these combinations. Unless stated otherwise, dimensions and geometries of the various structures depicted herein are not intended to be restrictive of the invention, and other dimensions or geometries are possible. In addition, while a feature of the present invention may have been described in the context of only one of the illustrated embodiments, such feature may be combined with one or more other features of other embodiments, for any given application. It will also be appreciated from the above that the fabrication of the unique structures herein and the operation thereof also constitute methods in accordance with the present invention. The present invention also encompasses intermediate and end products resulting from the practice of the methods herein. The use of “comprising” or “including” also contemplates embodiments that “consist essentially of” or “consist of” the recited feature.

[0073] 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.