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See Chinese contents: GB/T 15543-2008 GB/T 15543-2008: Power quality -- Three-phase voltage unbalance
This Standard specifies limits, calculation, measurement and evaluation methods of three-phase voltage unbalance. This Standard is applicable to, AC power system of which the nominal frequency is 50Hz is operated in normal mode, voltage unbalance at common coupling point caused by negative-sequence fundamental-wave component; and voltage unbalance at common coupling point caused by zero-sequence fundamental-wave component of the low-voltage system.
