Suitable opperation of power station consist of firstly securing consumer's active and reactive 0 power at any moment of load changes and show appropriate feed back. Secondly control his frequency and voltage. Thirdly opperation be accomplished with minimum expence, or so called an economical opperation is produced According to calculations unit efficiency decreases and internal consumption ratio increases at load changes and could say that unit. efficiency is maximum when at full load and internal consumption ratio is of its minimum value.

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