Express method of assessment and forecast for resonance overvoltage in the main power electrical grids
One of the main causes of equipment failure in the main electrical network is a overvoltage, that is, increase the value of the operating voltage above the maximum value according to the technical requirements. This is because the relatively small insulation reserve provides for the components of the electricity grid because of its high cost for a given voltage. Generally, cost of power systems insulation is a significant factor in capital expenditures. Internal overvoltage appears through resonance, due to coincidence of the parameters of the circle. This type of overvoltage caused by the network properties can be removed by changing the ratio between the parameters of the network and its modes. Unlike of switching overvoltage that last few hundredths of a second resonance not only arise unexpectedly, but there may be a long time until the effect of increasing voltage protection, voltage regulators or intervention personnel will not change schemes or mode. According to regulations, the resonant surge not taken into account when selecting insulation or nonlinear parameter constraints as these protective measures calculated to limit switching over, not to extinguish a long process. Therefore, the likelihood of accidents and development system in the resonance surge is considerable. The importance of the problem of restrictions over the class and led a line of research thesis. References 5, figures 2, tablе.