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vinodsingh1150409
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During the last decade there has been a steep growth in the demand of electric power in India and a phenomenal increase in the number if consumers of all categories, particularly in the agricultural and industrial sectors. The generation and transmission capacities have not kept pace, In general, with the load-demand necessitating the generators to be loaded to their maximum capacity most of the time. Due to insufficient spinning reserves, any emergency outage of major generating unit of the tripping of a tie-line on fault leads to frequency sinking, over–loading and cascade tripping of generators. The low frequency condition id generally accompanied by low voltage unless elaborate arrangements like field forcing, etc. are provided irr the generators. This is further aggravated due to the lines are involved. The system is likely to separate out at an undesirable, into two segments with large disproportionality in the generation and load demand. Frequent operation of the system at low frequency also results in cumulative damage to the generating units, particularly to the low pressure-stage blades of steam turbines and in their ultimate mechanical breakdown.