FIELD OF INVENTION

[001] This invention relates to Bottom Bus Duct Connection of Gas Turbine Generator for Gas turbine/Combined Cycle power plant. This invention is particularly applicable to 250 MW class gas turbine generator.
BACKGROUND/PRIOR ART OF THE INVENTION
[002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[003] 250 MW class gas turbine generator bus duct is known to be available in the art.
[004] This design has centre line of Gas Turbine Generator set as 5.436 meter. Due to the raised elevation of generator sets, the earlier available rotor handling arrangement by means of trailer & jack cannot be adopted without major changes. In view of the fact, this arrangement (the option of modified jacking & lifting arrangement) is being quite expensive hence not adopted by supplier and furthermore it requires fabricating temporary structure for every withdrawal & insertion.
[005] In view of the above, alternative solution is to enhance capacity of EOT crane (utilized for generator end seal removal arrangement) for rotor removal (handling). The same can also be utilized for generator end seal removal arrangement, which is a permanent solution. This does away with customer dependence on rotor handling agency.
[006] Now, reference may be made to Fig. 1 regarding prior art, wherein a gas turbine generator (1) is mounted on a foundation (2). There is provision of an adopter chamber (3) accommodating multiple (total six nos. of) isolated bus ducts (3A) and the adopter chamber (3) is connected to said generator (1).
[007] The phase and neutral bus ducts of generator terminating at one end of the generator (1) are connected to transformer via said adopter chamber (3). Here, neutral terminals is at back and phase terminals is in front part of the gas turbine generator (1) when viewed from Non Driving end”.
[008] Now, the parts involved in the prior art can be further discussed hereinunder:-
- Gas turbine generator (1) is provided with multitude of (total six nos. of) bushings (4) at top thereof. A plurality of lubrication oil pipes are placed under the generator (1).
- Foundation (2) of the generator (1) as shown in fig. 1 is substantially having a C-section housing cable trays for slip ring motor. Bushing connecting conductors (5) are provided in connection with respective bus duct (3A) within the adopter chamber (3) by means of flexibles (6) and connected to bus duct of generator (terminals of generator).
[009] Here, the connecting member between the connecting conductor and duct is made of Aluminium.
[010] However, this necessitates larger chamber (3).
[011] One of the demerit of the above alternative is that providing Generator Bus duct in present arrangement of Generator Terminals (on Top of GT-Generator). Posing restriction to thorough Overhead crane movement. Moreover, removal of top mounted Busduct & adopter chamber required with external means prior to reaching of EOT crane over Gas Turbine Generator.
[012] Thus, the same in present arrangement of Generator Terminals (on Top of GT-Generator) is posing as restriction for direct approach to generator end shield, generator cooler and generator rotor withdrawal to be operated from top EOT crane, which is presently a cumbersome & complex operation.
[013] Further it necessitates separate handling arrangement for removal of Generator end shield & generator coolers prior rotor withdrawal by EOT crane.
[014] In view of the above, present invention has been devised so as to address issues of prior art and serve the purpose efficiently.
OBJECTS OF THE INVENTION
[015] An object of the invention is to propose Bottom Bus Duct Connection of Gas Turbine Generator for Gas turbine/Combined Cycle power plant which obviates drawbacks of prior art(s).
[016] Another object of the invention is to propose Bottom Bus Duct Connection of Gas Turbine Generator for Gas turbine/Combined Cycle power plant which is more economic, aesthetic & efficient.
[017] Still another object of the present invention is to provide Bottom Bus Duct Connection of Gas Turbine Generator for Gas turbine/Combined Cycle power plant which avoids restriction of EOT (Electric overhead travelling) crane direct approach to generator End-shield, coolers and generator rotor withdrawal for periodic maintenance.
[018] These and other objects and advantages of the present invention will be apparent to those skilled in the art after a consideration of the following detailed description taken in conjunction with the accompanying drawings in which a preferred form of the present invention is illustrated.

SUMMARY OF THE INVENTION
[019] One or more drawbacks of conventional systems and process are overcome, and additional advantages are provided through the apparatus and a method as claimed in the present disclosure. Additional features and advantages are realized through the technicalities of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered to be part of the claimed disclosure.
[020] According to this invention, there is provided Bottom Bus Duct Connection of Gas Turbine Generator for Gas turbine/Combined Cycle power plant comprising a gas turbine generator mounted on a foundation, wherein an adopter chamber accommodating multiple (total six nos. of) bus ducts is connected to said turbine generator, in which the phase and neutral bus ducts of generator terminating at one end of the generator are connected to transformer via said adopter chamber, wherein the gas turbine generator is having (total six nos. of) bushings at bottom thereof; said foundation includes two pillars facing each other maintaining a gap there between; the connecting conductors are placed on the respective duct within the adopter chamber without any flexibles and connected to bus duct of the generator.
[021] The generator is having neutral terminals in front and phase terminals in rear.
[022] A plurality of lubrication oil pipes are positioned on one side of the generator.
[023] The foundation, each of the pillars of which is having substantially L-section.
[024] The foundation accommodates said generator, adopter chamber and bus ducts.
[025] The adopter chamber is located under said turbine generator.
[026] The connecting member between the bushing terminals and bus duct is made of copper.
[027] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.
[028] It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined to form a further embodiment of the disclosure.
[029] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
[030] The illustrated embodiments of the subject matter will be best understood by reference to the drawings, wherein like parts are designated by like numerals throughout. The following description is intended only by way of example, and simply illustrates certain selected embodiments of devices, systems, and processes that are consistent with the subject matter as claimed herein, wherein: -
Fig. 1 shows: Gas turbine generator connection from top of the generator according to prior art.
Fig. 2 shows: Bottom Bus Duct Connection of Gas Turbine Generator for Gas turbine/Combined Cycle power plant in accordance with present invention.
Fig. 3 shows: Adaptor chamber of the present invention.
[031] The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily 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 PRESENT INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS OF PREFERRED EMBODIMENTS
[032] 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.
[033] The present invention makes a disclosure regarding a technology pertinent to Bottom Bus Duct Connection of Gas Turbine Generator for Gas turbine/Combined Cycle power plant. This involves the detailed design & Gas Turbine Generator Bus Duct Layout, Supporting Structure layout, Common Chamber design, Generator foundation design, cabling for pilot exciter, Neutral formation & neutral bus duct connection to NG Cubicle, Phase reversal in Generator Bus duct after generator terminals, compact layout for connection to SPVT Cubicle, clearance from Generator Lube oil piping etc.
[034] Thus, bottom Bus duct connection of GTG has not only done away with the requirement of monorail, tripod arrangement of chain pulley block for removal of Generator End-shield & Coolers, but also allows the easy & simple rotor withdrawal for periodic maintenance by customer & imparts aesthetic look to TG Hall.
[035] Thus, gas turbine/combine cycle power plants layouts design have been evolved with overall optimization in space & height and aesthetics, efficacy of the plant.
[036] The invention of Proposed Application introduces Gas Turbine Generator (GTG) Bottom mounted terminals with newly designed Bottom Connection with Generator Busduct & its Adopter Chamber located below Generator. The Bottom Connection of Generator Busduct provides ease of movement of EOT Crane for removal of Generator Rotor, End Seal & Generator Coolers without dismantling any Busduct.
[037] Now, reference may be made to Fig. 2, wherein a gas turbine generator (100) is mounted on a foundation (102). There is provision of an adopter chamber (103) accommodating multiple ducts (103A) and the adopter chamber (103) is connected to said generator (100). The phase and neutral bus ducts of generator terminating at one end of the generator (100) are connected to transformer via said adopter chamber (103). Here, neutral is at front and phase is in rear part of the gas turbine generator (100).
[038] The present invention is associated with various components, which can be described herein below: -
- Gas turbine generator (100) is having multitude of (total six nos. of) bushings (104) at bottom thereof. According to one aspect of the invention, a plurality of lubrication oil pipes are positioned on one side of the generator (100).
- A foundation has been designed for the present invention as best seen in Figure 2. Said foundation includes two pillars (201, 202) facing each other maintaining a gap there between, in which each of the pillars (201, 202) is having substantially L-section. This provision of the foundation gives rise more space so as to house the turbine generator (100), adopter chamber (103) and bus ducts.
[039] In accordance with present invention, the connecting conductors (105) are placed on the respective duct (103A) within the adopter chamber (103) without any flexibles and connected to bus duct of the generator (100) i.e. terminals of generator. In the invention, the connecting member between the bushing terminals (105) and bus duct, is made of copper (Cu).
[040] As the length of the connecting member is quite small as compared to the known art connecting member, hence the cost of the same is comparable to cost of prior art connecting member.
[041] The direct placement of the connecting conductor on said duct requires less space, thereby rendering the chamber (103) compact. So that, the same can be accommodated in less space at bottom.
[042] The chamber (103) is located under the turbine generator (100).
[043] The aforesaid provision of new turbine generator (100), adopter chamber (103) and foundation results in improved layout of bus duct.
[044] Functionally of some main features of the invention are given hereinbelow:-
Generator Busduct: An Isolated Phase Busduct (IPB) Conductor emanating from Generator connecting to a Generator Transformers containing very high current of the order of 8000 Amp. Or more.
Generator Busduct adopter Chamber: A Metal Container Enclosure Housing connection of Phase & Neutral terminals of Generator with Generator Busduct supported with insulators connected to adopter chamber.
Neutral Busduct for NG Cubicle tap-off: A Typical common Busduct member after neutral formation connecting to Neutral Grounding Cubicle.
Neutral Formation: A common connection of three different phases from Generator Neutral terminals shorting at a common point.
Advantageous Features
• Improved O&M aspects
• Time Cycle reduction of GTG Rotor Handling.
• Optimization of overall design of GTG Hall
• Improved Aesthetics of GTG Hall.
• Cost saving due to reduction of building height & saving in busduct supports & rotor handling operation.
• No need of tripod structure for busduct supports & mono rail in front of GTG.
• No bulky busduct & structure overhead of GTG as in case of top connection of generator busduct of GTG.
• No requirement of dismantling of GTG busduct in case of rotor handling.
Application
[045] Generator Bus duct is used for the effective and efficient supply of electricity from Generator to Step up Transformers for further transmission to Power Grid. Generator Busduct Conductors are housed in isolated phases metal enclosure. After Generator the power from Generator terminals transmit through Generator phase terminals to Generator Busduct adopter chamber. Adopter chamber also housing Generator Neutral Terminals connection with Generator neutral Busduct with Neutral formation outside adopter chamber.
Operation of Invention
[046] Compact Busduct Adopter Chamber & Bottom Busduct Connection is efficiently fulfilling the Basic requirement of transmitting connecting of Generator bus ducts with requirement of transmitting the Generating Power from Gas Turbine Generator to Generator in a new Busduct Layout with New Adapter Chamber design layout i.e. Bottom connection of Gas Turbine Busduct Layout with more optimized layout & more effective manner.
[047] Each of the appended claims defines a separate invention, which for infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the "invention" may in some cases refer to certain specific embodiments only. In other cases, it will be recognized that references to the "invention" will refer to subject matter recited in one or more, but not necessarily all, of the claims.
[048] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all groups used in the appended claims.
[049] 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 particulars 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 analogues 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”.
[050] The above description does not provide specific details of manufacture or design of the various components. Those of skill in the art are familiar with such details, and unless departures from those techniques are set out, techniques, known, related art or later developed designs and materials should be employed. Those in the art are capable of choosing suitable manufacturing and design details.
[051] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.
[052] The claims, as originally presented and as they may be amended, encompass variations, alternatives, modifications, improvements, equivalents, and substantial equivalents of the embodiments and teachings disclosed herein, including those that are presently unforeseen or unappreciated, and that, for example, may arise from applicants/patentees and others.
[053] While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.

Claims:

1.Bottom Bus Duct Connection of Gas Turbine Generator for Gas turbine/Combined Cycle power plant comprising a gas turbine generator (100) mounted on a foundation (102), wherein an adopter chamber (103) accommodating multiple ducts (103A) is connected to said turbine generator (100), in which the phase and neutral bus ducts of generator terminating at one end of the generator (100) are connected to transformer via said adopter chamber (103), wherein the gas turbine generator (100) is having multitude of bushings (104) at bottom thereof;
said foundation includes two pillars (201, 202) facing each other maintaining a gap there between;
the connecting conductors (105) are placed on the respective duct (103A) within the adopter chamber (103) without any flexibles and connected to bus duct of the generator (100).
2. The Bottom Bus Duct Connection of Gas Turbine Generator for Gas turbine/Combined Cycle power plant as claimed in claim 1, wherein the generator (100) is having neutral in front and phase in rear.
3. The Bottom Bus Duct Connection of Gas Turbine Generator for Gas turbine/Combined Cycle power plant as claimed in claim 1 or 2, wherein a plurality of lubrication oil pipes are positioned on one side of the generator (100).
4. The Bottom Bus Duct Connection of Gas Turbine Generator for Gas turbine/Combined Cycle power plant as claimed in the claims 1-3, wherein the foundation, each of the pillars (201, 202) of which is having substantially L-section.
5. The Bottom Bus Duct Connection of Gas Turbine Generator for Gas turbine/Combined Cycle power plant as claimed in the claims 1-4, wherein the foundation accommodates said generator (100), adopter chamber (103) and bus ducts.
6. The Bottom Bus Duct Connection of Gas Turbine Generator for Gas turbine/Combined Cycle power plant as claimed in the claims 1-5, wherein the adopter chamber (103) is located under said turbine generator (100).
7. The Bottom Bus Duct Connection of Gas Turbine Generator for Gas turbine/Combined Cycle power plant as claimed in the claims 1-6, wherein the connecting member between the bushing terminals (105) and bus duct is made of copper (Cu). ,