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why we are using the 2 slope in differential relay?but in
busbar differential we are using only one slope.
what is the reason.
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-on lowZ differential, when fault happens, CTs going to go saturated. slope aims to compensate error due to CT saturation because CTs have different characteristic.
-for busbar protection, it is HiZ differential, one slope because all CTs have same charracteristic. no need to compensate
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