Question 567Steam Plants - Assistant Engineer

The correct answer is D) assume the larger share of the load. When two turbo-generators with the same no-load speed settings are operating in parallel, the unit whose governor has the lesser speed droop will assume the larger share of the load. This is because the governor with the lesser speed droop will have a steeper frequency-power characteristic, causing it to pick up more load when the system frequency drops. In contrast, the unit with the greater speed droop will have a flatter frequency-power characteristic, causing it to pick up less load when the system frequency drops. The other answer choices are incorrect because: A) the unit with the lesser speed droop will have better power response, not poor power response; B) the unit with the lesser speed droop will have better sensitivity characteristics, not poor sensitivity characteristics; and C) the unit with the lesser speed droop will assume the larger share of the load, not the smaller share.