GB/T 15543-2008: Power quality -- Three-phase voltage unbalance

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Scope

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.
Voltage permissible unbalance factor and permissible value of negative-sequence
current of rated condition of electrical equipment shall still be specified by the various
standards, for example, rotating motors shall meet the requirements in GB 755.
Instantaneous and momentary unbalance problem are not applicable to this Standard.

Basic Data

Standard ID	GB/T 15543-2008 (GB/T15543-2008)
Description (Translated English)	Power quality -- Three-phase voltage unbalance
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	K04
Classification of International Standard	29.020
Word Count Estimation	10,187
Date of Issue	2008-06-18
Date of Implementation	2009-05-01
Older Standard (superseded by this standard)	GB/T 15543-1995
Quoted Standard	GB/T 156-2007; GB/T 12325
Regulation (derived from)	Announcement of Newly Approved National Standards No. 11 of 2008 (No. 124 overall)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard specifies the three-phase voltage unbalance limits, calculation, measurement and value method. This standard applies to the nominal frequency of 50Hz AC power system to normal operating mode due to the negative sequence fundamental component of the induced voltage at the point of common coupling system due to imbalances and zero-sequence voltage caused by the fundamental component of the voltage is not common connection point balance, electrical equipment rated conditions of voltage unbalance degree and negative sequence current is allowed to remain with their respective standard values ??, such as a rotary motor according to GB 755 requires regulations, instantaneous and temporary imbalance does not apply to this standard.