Generators for gas-engine drives, 1–32 MVA

Description

Generators for gas-engine drives are synchronous machines for cogeneration and mini-CHP plants, installations running on biogas, landfill and associated gas, and for prime-power supply systems. The company develops them using its own technology and notes that such generators require rigid design specifications and a specialized manufacturing process. The operating conditions are similar to diesel installations: the piston engine produces high vibration and constant cyclic stresses, which over time cause fatigue of windings and mechanical parts. The rotor and stator are therefore designed with an increased margin of strength, and dynamic calculations are performed by the finite element method. Gas-engine manufacturers set an additional requirement: compatibility with the grid codes of different countries and operation in various climatic conditions; the manufacturer checks compliance with the grid code requirements of each specific country. Catalogue parameters: power 1–32 MVA, voltage up to 15 kV, frequency 50/60 Hz, rotational speed 187–1800 rpm. Rolling or sliding bearings, degree of protection IP23–IP54, output leads from the side, top or bottom, shaft end cylindrical, flanged or with an SAE flange. Rotor salient-pole or non-salient-pole, excitation brushless or static; a permanent-magnet pilot exciter (PMG) and slip rings are possible. Stator windings are made of multi-strand rectangular-section copper wire in glass sleeving, with epoxy-mica insulation of class F or higher; the insulation is applied by robots, and the entire stator undergoes global vacuum-pressure impregnation. The core is assembled from cold-rolled electrical steel with double-sided sheet insulation. Before shipment the generators pass tests on automated test benches. Applications: gas-engine CHP plants of industrial enterprises and utilities, biogas stations, installations on mine and associated oil gas, standby and peaking stations. Production takes place in Bangalore (India) and Gebze (Turkey); certificates CE/UKCA, CSA, UL and GOST R / TR CU.

Technical specifications