【正文】 ined in IEC Standards. After a 6 hour continuous run at the specified rated terminal output condition, with the cooling medium inlet temperature not exceeding 40?C ,the generator temperature rises will ply with those permitted for the class of insulation material used. Control and Instrumentation The Bidder shall include a prehensive list of the instrumentation to be provided for each generator and associated equipment. The proposed level of instrumentation method of indication will be submitted for Owner review and approval. Calibrated thermocouples will be provided in the regions of maximum temperature to provide indication of the temperatures of the generator ponents and the cooling media. The position and number of thermocouples will be stated in the Bid Proposal. If thermocouples will not be provided for the stator end iron laminating, the bidder shall demonstrate that the possibility of overheating in that part has been eliminated by design. Leads from thermocouples search coils and vibration transducers will be brought out to sealed terminal boards mounted on the generator in a position accessible during normal operation of the 36 unit. A minimum of 20% spare terminals will be provided on the generator terminal boards. All terminals will be suitable for duplex external connections. Indicating and recording equipment will be provided in the CCR via the control system. The rotor temperature will be determined by a standard method and will be indicated in the CCR. The equipment will be suitably damped to indicate a steady rotor temperature when operating on the national system. The damping will be such, or a time delay be provided, so that alarm signals will not be initiated under startup, shutdown, tap changing and other transient loading conditions. The contractor shall provide the local and CCR display and alarm for owner approval. STATORS Stator Casing and Winding Facilities will be provided at two positions on the generator casing for connecting to the isolated phase busbar/station grounding system. Sufficient section of material to safely carry the maximum unrestricted earth fault current will be provided. The stator core will be made of high permeability low loss material, insulated on both sides. The material specification for the stampings, the insulation between stampings, and the procedure adopted in debarring the plates and checking the finished, stampings, will be such as to eliminate the possibility of interstamping shorts and resultant core faults. The choice of materials, proportioning, calmping and arrangement of the core in the casing, will ensure the minimum noise and 100Hz vibration within the core plus the minimum transmission of vibration to the generator foundations, pipes and associated equipment. All fixing and locking ponents in the ends of the fully assembled generator will be nonmagic. This will apply to the volume enclosed by the core end plate and corresponding frame rib, the casing wrapper plate and the end shield inner covers. Any magic items in this enclosure will be listed in the Bid Proposal. 37 The stator winding will be star connected with all winding ends brought out. Heaters will be provided to prevent condensation in the generator during shutdowns. The winding insulation system will be designed and manufactured in such a way that it will meet the specified machine life for the given duty cycle. Insulation thi。 業(yè)主招標(biāo)附件： ELECTRICA WORKS GENERATORS AND ASSOCIATED EQUIPMENT GENERAL The generator will be properly designed for application directly coupled to the turbine as its prime mover and to operate continuously at the steam turbine maximum output. The generator will be designed to operate safely and reliably and 33 will be capable of operation as a base load unit, . minimum 8000 hours per annum. The generator will be supplied plete with all necessary auxiliary equipment to make a pletely functional system and will include the followings as a minimum: Excitation system plete Generator stator housing Turbine generator mon lubricating system Generator cooling system Core monitor All special tools and instruments for rotor and cooler withdrawal and insertion gear All require instrumentation and controls The Bidder will describe the calculation methods and provide results for the following items: Generator reactance and time constant Efficiencies (the method and tolerances will be subject to the approval of the Owner) Rated load excitation Calculated temperatures at rated load DESIGN REQUIREMENTS Rating The generators and the exciters will ply with IEC 600343 unless otherwise specified. Any deviations from IEC 600343 will be clearly stated in the Bid Proposal. The generator rated voltage will be selected by The Bidder. The short circuit ratio based on the noload excitation current at rated generator voltage and the short circuit excitation current at rated generator current will not be less than . The generator will be capable of continuously supplying times its nominal rated output at rated voltage and power factor over the frequency range Hz to 51 Hz, and at rated frequency and power factor with a voltage variation of +/5%. It is appreciated that this overload capability could effectively increase the maximum continuous rating of the generator. The bidder shall provide full details of the effects of this overload condition. 34 Moreover, the design will be such as to meet the following condition or requirements: a) Operation at MCR, from 51 to Hz, at rated load and power factor over a voltage range of to . within temperature rise limits. b) Operation ove