engleski

Measurement of synchronous generator sudden short circuit currents

The paper describes a sudden short-circuit of a synchronous generator as the basic test for determination of main machine parameters. Some of the parameters are the direct-axis transient x_d' and the subtransient reactances x_d", the quadrature-axis subtransient reactance x_q" and time constants t_d', t_d" and ta. For that purpose the measuring of currents at a three-phase sudden short-circuit test with double grounding on an industrial gas turbogenerator with rated power 4000 kVA has been carried out. The sudden short-circuit has been applied in the following versions: with double grounding (at the neutral-point and at the location of the short-circuit) and without grounding only at a laboratory test on the generator rated power 170 kVA. The purpose of the paper is to show the influence at currents' third harmonic on the results of machine parameters determination.

synchronous generator; sudden short-circuit; parameters measurement; harmonics

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