This standard specifies the frequency deviation limits, measurement and statistical methods for the pass rate of power systems with a nominal frequency of 50 Hz. This standard does not apply to frequency deviation limits for electrical equipment.
GB/T 15945-2008 history
2008GB/T 15945-2008 Power quality.Frequency deviation for power system
1995GB/T 15945-1995 Quality of electric energy supply. Permissible deviation of frequency for power system