Recent Developments of Electrical Drives - Part 4. The book stating the recent developments of electrical drives, can be useful for engineers and researchers investigating and designing electrical and electronic devices as well as for students and young researchers dealing with electrical and electronic engineering, computer sciences (advanced computer modelling, sophisticated control systems with artificial intelligence tools applied, optimal design bye use of classical and genetic algorithms employed), applied mathematics and all the topics where electromagnetic, thermal, mechanical phenomena occur | I-2. OPTIMIZED CALCULATION OF LOSSES IN LARGE HYDRO-GENERATORS USING STATISTICAL METHODS Georg Traxler-Samek Alexander Schwery Richard Zickermann and Carlos Ramirez ALSTOM Switzerland Ltd. Hydro Generator Technology Center CH-5242 Birr Switzerland Abstract. A very important issue during the electrical design of hydro-generators is the reliability of the loss calculation in the manufacturer s design calculation program. The design engineer who has to guarantee the losses must be able to estimate the risk of liquidated damages when defining the guarantee values. This paper presents the optimization of the loss calculation in a design program for salient pole synchronous machines. Statistical methods are used to calibrate the loss calculation with measurements made during commissioning. Within this paper special importance is attached to the optimization of the no-load electromagnetic losses. Introduction In hydro power plants the mechanical power of the water turbine is converted into electrical power mainly by three-phase synchronous generators with salient poles see Fig. 1 . These machines are built with an active power up to 800 MW. To reach the best efficiency of the turbine the speed of the generator is adapted to the hydraulic conditions resulting in typical speed ranges of generators from 67 to 1 500 rpm. The corresponding number of poles of the salient pole machine start from 2p 4 up to 2p 90 for a 50 Hz grid. In the basic design phase of a hydro-generator the design engineer optimizes the electrical design regarding the electromagnetic load the temperature rises the losses and the manufactoring costs without exceeding tolerable mechanical stresses in the machine at runaway speed. The main problem when calculating power losses in hydro-generators are deviations between the calculated and measured losses. These deviations can .
