| 摘要 |
FIELD: electricity.SUBSTANCE: invention is related to electrical engineering, in particular, to methods of operation and diagnostics of electrical machines, mainly generators of power plants. Technical result ensures effective elimination of accelerated wear processes for stator elements attachment fitting without essential limitation of reactive power transmitted by the electrical machine to the network. In order to attain the above technical result parameters of vibro-acoustic oscillations of the electrical machine structural components are measured by means of well-known devices. Against measured data accelerated wear process is detected in stator elements attachment fitting in result of vibroimpulsive interaction of elements in defect units. Electric parameters such as excitation current and reactive load are measured during operation mode of the electrical machine. Reduction of wear processes in the attachment fitting is ensured by change of excitation current of the machine. Change of excitation current is made till vibroimpulsive interaction of elements in defect units is stopped. Thereafter current excitation value is recovered close to the initial value so that reactive power of the generator complies with requirements of the power system operator. The suggested method is based on use of non-linear events in vibroimpulsive systems found in attachment fitting of stator end windings so that frictional force acting in attachments fittings in conditions of rest state is always bigger than sliding friction.EFFECT: invention allows recovering excitation current to the initial value after stoppage of accelerated wear processes without their renewal.2 cl, 1 dwg |
