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I am having trouble understanding the three light bulb method for checking whether of not two generators have the same phase sequence. It states in my book, "If all three bulbs get bright and dark together, then the systems have the same phase sequnce."

My question is, if the two generators have the same phase sequence, and the voltages generated in each phase are the same, how will there even be a potential difference across the bulb to allow it to light up?

I am not sure if my question makes sense....Im sure it is just a basic misunderstanding.

Thanks for the help

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# Parallel Synchronous Generators

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