GB/T 15543-1995
AbolishedQuality of electric energy supply--Admissible three-phase voltage unbalance factor
电能质量 三相电压允许不平衡度
Application Summary AI generated
This standard specifies the permissible limits for three-phase voltage unbalance in public power supply systems, defining the maximum allowable negative-sequence voltage unbalance factor (typically 2% for normal conditions). It is applied by electrical utilities and industrial facilities in China to assess and control power quality, particularly for equipment sensitive to voltage asymmetry such as three-phase motors and transformers. The standard is used in the design, operation, and monitoring of distribution networks to prevent overheating, reduced efficiency, and premature failure of electrical equipment.
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