This standard specifies the basic requirements for the permissible frequency deviation of the power system and its measuring instruments. This standard applies to power systems with a nominal frequency of 50Hz under normal operation. This standard does not apply to frequency tolerances for electrical equipment.
GB/T 15945-1995 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