GB 12325-1990 Power Quality Supply Voltage Allowable Deviation

GB 12325-1990 Power Quality Supply Voltage Allowable Deviation GB12325-1990 Standard download and decompression password: www.bzxz.net

National Standard of the People's Republic of China
Power quality
Permissible deviation of supply voltage
Quality of electric energy supplyAdmissible deviation of supply voltage1Theme content and scope of application
GB12325—90||tt ||This standard specifies the allowable deviation of supply voltage. The purpose of formulating this standard is to basically guarantee the quality of power supply voltage in order to obtain good social and economic benefits.
This standard applies to the deviation of the supply voltage from the rated voltage under normal operating conditions of the AC 50Hz power system. This standard does not apply to transient and abnormal operating conditions. Note: ① The rated voltage in this standard is the system rated voltage. ②Normal operating conditions mean that all components in the power system operate according to predetermined operating conditions. 2 Reference standard
GB156 rated voltagebzxZ.net
3 Supply voltage allowable deviation
3.135kV and above The sum of the absolute values ??of the positive and negative deviations of the supply voltage shall not exceed 10% of the rated voltage. Note: If the upper and lower deviations of the power supply voltage have the same sign (both positive or negative), the larger absolute value of the deviation will be used as the basis for measurement. 3. The allowable deviation of three-phase power supply voltage of 210kV and below is ±7% of the rated voltage. 3. The allowable deviation of 3220V single-phase power supply voltage is +7% and -10% of the rated voltage. Note: ① The allowable deviation of voltage under rated operating conditions of electrical equipment is still stipulated by respective standards. For example, rotating electrical machines are stipulated in GB755 "Basic Technical Requirements for Rotating Electrical Machines".
② For users with special requirements for voltage, the allowable deviation of the supply voltage is determined by the power supply agreement. State Bureau of Technical Supervision approved the implementation on 1990-12-01 on 1990-04-20
GB12325-90
Appendix A
Description of supply voltage and voltage deviation
(Supplement )
A1 The power supply voltage in this standard is the voltage at the property boundary between the power supply department and the user or the voltage at the electric energy metering point stipulated in the power supply agreement.
A2 voltage deviation (%)
measured voltage - rated voltage
rated voltage
and Frequency Standardization Technical Committee proposed and coordinated. This standard is drafted by the Power Quality Supply Voltage Allowable Deviation Working Group. The main drafters of this standard are Lin Haixue, Song Sen, Zhang Dakun, Lu Benping, and Xu Desheng.
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