| Popis: |
The location territorial features of the Murmansk region electric power system determine its susceptibility to geomagnetically induced currents flowing through the dead-grounded neutrals of the transformers (autotransformers) during geomagnetic storms. The current values can sometimes reach tens of amperes and lead to half-period saturation of the steel core, and as a result to loss of reactive power, the appearance of harmonics, vibrations and windings overheating. All this can cause an emergency shutdown of lines or failure of the equipment itself. The article considers the analysis of the transformers and autotransformers technical condition of substations of voltage classes 110–330 kV on the Kola Peninsula. Statistics on the core types of the devicesare provided. Existing methods to reduce the effect of geomagnetically induced currents on transformers, as well as their advantages and disadvantages, are discussed. |
