Standard Technical Features of BTG System for Supercritical 660 ...
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Standard Technical Features of BTG System for Supercritical 660 ...

Standard Technical Features of BTG System for Supercritical 660 ... Standard Technical Features of BTG System for Supercritical 660 ...

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Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units16.1.6 Design and constructional featuresAll components of the generator to be designed to avoid resonance at anyof the frequency in the operating range.i) Stator BodyEnclosureii) Stator CoreMaterialiii) Stator WindingTo withstand without any residual deformation,any internal hydrogen explosion.High permeability, low loss, cold rolled siliconsheet steel segmental punchings.a) Winding configuration Stator winding consisting of three phase,double layer, short chorded, bar type windinghaving two parallel paths or multiple parallelpaths (for indirect hydrogen cooling), but incase of double star winding, the total number ofterminal bushings shall be either six (6) or nine(9). The elementary conductors to be Roebeltransposed in the slot portion.b) Winding insulation Epoxy thermo-setting type and rated for class155(F). Provided with adequate protection onthe winding and slots for avoiding the coronaand other surface discharges.iv) De-mineralized (DM) Water Headers (if applicable)a) Inlet and outlet waterheadersShall be of stainless steel / SUS/ Copper.b) Insulation The headers and header connections as permanufacturer’s standard practice shall beacceptable and shall be suitably insulated fromthe stator body.v) Stator Winding Connection and Terminal Bushingsa) Winding Star connected. 3 phase and 3 neutral terminalsbrought out. In case of double star winding, thetotal number of terminals shall be either six (6)or nine (9). All stator terminal lead connectionsinside the generator to be suitably supported tocontain vibration.125

Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsb) Winding overhang Overhang portion of winding to be braced andsupported to withstand three phase short circuitat its terminal as per IEC-60034.c) Bushing housing To be housed in stator frame in a non-magneticsteel terminal box or as per provenmanufacturer’s practice.d) Bushing Porcelain/ epoxy based material with nonhygroscopicproperty with suitable coolingarrangement.vi) Rotorvii) Rotor WindingMachined from a single alloy steel forging togive the required mechanical, metallurgical andmagnetic characteristics. Shall have anadequate margin between critical speed and therunning speed to ensure smooth running.a) Conductor Coils made of hard drawn silver bearingcopper.b) Insulation Epoxy glass based material rated for class155(F) insulation.c) Retaining rings Retaining ring of high strength, non-magneticalloy steel forging of Mn18Cr18, resistant tostress corrosion to be provided to prevent themovement of rotor winding in the radial/ axialdirection due to centrifugal/ thermal stresses.d) Locking nuts/ snapringsHigh strength non-magnetic alloy steel forgingto be provided on the retaining rings or as permanufacturer’s proven arrangement of lockingto prevent any axial movement.e) Centering rings To be mounted at the end of the retaining ringsto support it in position or applied as permanufacturer’s standard practice.viii) Bearingsa) Type Self aligning type sleeve/ tilting pad typebearings either mounted on separate pedestalsor on the end shields. Bearing housings and itsshells to be of split construction. Shells to belined with tin based babbitt metal.b) Seal Provided with labyrinth shaft seals/ oildeflectors.126

<strong>Standard</strong> <strong>Technical</strong> <strong>Features</strong> <strong>of</strong> <strong>BTG</strong> <strong>System</strong> <strong>for</strong> <strong>Supercritical</strong> <strong>660</strong>/800 MW Thermal Units16.1.6 Design and constructional featuresAll components <strong>of</strong> the generator to be designed to avoid resonance at any<strong>of</strong> the frequency in the operating range.i) Stator BodyEnclosureii) Stator CoreMaterialiii) Stator WindingTo withstand without any residual de<strong>for</strong>mation,any internal hydrogen explosion.High permeability, low loss, cold rolled siliconsheet steel segmental punchings.a) Winding configuration Stator winding consisting <strong>of</strong> three phase,double layer, short chorded, bar type windinghaving two parallel paths or multiple parallelpaths (<strong>for</strong> indirect hydrogen cooling), but incase <strong>of</strong> double star winding, the total number <strong>of</strong>terminal bushings shall be either six (6) or nine(9). The elementary conductors to be Roebeltransposed in the slot portion.b) Winding insulation Epoxy thermo-setting type and rated <strong>for</strong> class155(F). Provided with adequate protection onthe winding and slots <strong>for</strong> avoiding the coronaand other surface discharges.iv) De-mineralized (DM) Water Headers (if applicable)a) Inlet and outlet waterheadersShall be <strong>of</strong> stainless steel / SUS/ Copper.b) Insulation The headers and header connections as permanufacturer’s standard practice shall beacceptable and shall be suitably insulated fromthe stator body.v) Stator Winding Connection and Terminal Bushingsa) Winding Star connected. 3 phase and 3 neutral terminalsbrought out. In case <strong>of</strong> double star winding, thetotal number <strong>of</strong> terminals shall be either six (6)or nine (9). All stator terminal lead connectionsinside the generator to be suitably supported tocontain vibration.125

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