Generators for gas turbines up to 200 MW, including explosion-proof

Description

Generators for gas turbines are synchronous machines with a non-salient-pole (cylindrical) rotor, designed for the high centrifugal loads of a high-speed drive. According to the manufacturer, generators for gas turbine installations are produced in ratings up to 200 MW and operate both in densely populated cities and at remote sites where stable operation without constant maintenance is important. General parameters of the turbogenerator range per the catalogue: voltage up to 15.75 kV, frequency 50/60 Hz, speed 1500, 1800, 3000 or 3600 rpm, brushless or static excitation, rolling or sleeve bearings. Shafts can extend to one or both sides, for schemes with a drive from two machines or with an additional mechanism. A separate direction is designs for the oil and gas industry and for geothermal power stations. These generators are designed for outdoor installation and rated for extreme temperatures and aggressive atmospheres. Explosion-proof versions are made for Zone 2 / Division 2, gas groups IIA, IIB, IIC (and Group B, C, D) and temperature classes T1–T4, by the types of protection 'increased safety' (Ex e) and 'pressurized enclosure' (Ex p). For media with a high hydrogen sulphide content, purging systems are provided. Cooling methods are IC81, IC616, IC611 and WP II. The anti-corrosion coating system conforms to class C5 High per ISO 12944. The generators carry ATEX, IECEx and UL/CSA certificates. An example application from the manufacturer's materials: 5.25 MVA generators as part of mobile power units used for hydraulic fracturing in the USA. Generators of this group are also used at sugar and ethanol plants (range 1–200 MW), in thermal power plants and in heat recovery schemes. Production and testing take place at the plants in Bangalore; the rotors and stators are made in-house, with global vacuum-pressure impregnation and balancing at elevated speed. Design is performed to IEC, NEMA, API and JIS; the manufacturer is certified to ISO 9001, ISO 14001, ISO 45001 and ISO 3834-2 (welding).

Technical specifications