In case of a synchronous generator carbon brushes, some
brushes expire before the others. Why is so? When all the
brushes are installed at the same time, why don't thee
expire at the same time?
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That depends on shape of the brush holder and spring pressure on each brush
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At 765Kv, I have seen the use of PT at line side for metering and CVT for protection, although as far as my knowledge is concern, PT at this voltage level will have huge loss and more cost as compared to CVT as CVT can also perform same function of Protection and Metering? So my question is why use PT and not CVT for metering and protection in order to reduce the cost.
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