GETCO Exam Paper (30-11-2008)
Power system A is operating in parallel with other systems and has a frequency bias of 50 MW/0.1 Hz. For a loss of generation in one of the interconnected systems resulting in a frequency drop of 0.02 Hz, system A should

provide 20 MW of support
provide 10 MW of support
not be affected
provide 30 MW support

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GETCO Exam Paper (30-11-2008)
A buchholz will operate in a transformer whenever there is

over load
any of the above
large internal fault
saturation of magnetic circuit

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