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由于机组型式和安装布局的关系,发电机有时必须反转。相复励和三次谐波励磁的发电机,其起励和运行特性与转向无关;直流励磁机反转后,只要把励磁机的励磁电源正负接线对调,即可起励建压;唯有某些(多属微型)双绕组电抗分流自励恒压发电机,反转后虽仍能起励建压,但并列后不能正常运行,必须对励磁接线相应的调整。近年来,我们先后对多台发电机作过改接,改善了并网运行的性能。现将其原理和作法介绍如下,供参考。
Depending on the type of unit and the layout of the installation, the generator must sometimes be reversed. Phase excitation and excitation of the third harmonic generator, its excitation and operating characteristics and steering has nothing to do; DC exciter reversal, as long as the exciter excitation power positive and negative wiring on the transfer, you can encourage excitation pressure; only Some (mostly subminiature) reactors shunt self-excited constant voltage generator, after inversion can still encourage excitation pressure, but can not be normal after the parallel operation, the excitation wiring must be adjusted accordingly. In recent years, we have successively changed over several generators to improve the performance of grid-connected operation. The principles and practices are introduced below, for reference.