1 Scope
This standard specifies the limit, measurement and qualification rate statistics for supply voltage deviation of power grid.
This standard is applicable to the deviation of supply voltage to nominal system voltage for AC 50Hz power system under normal operation condition.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent modification to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document is applicable to this standard.
GB/T 156-2007 "Standard Voltage" (IEC 60038:2002, MOD)
3 Terms and Definitions
For the purpose of this standard, the following terms and definitions apply.
3.1
Nominal system voltage
It refers to the given value used for marking or identifying system voltage.
[GB/T 156-2007, Definition 3.1]
3.2
Supply terminals
It refers to the coupling point of power distribution system of power supply department and electrical system of user.
[GB/T 156-2007, Definition 3.3]
3.3
Supply voltage
It refers to line voltage or phase voltage at supply terminals.
[GB/T 156-2007, Definition 3.4]
3.4
Voltage deviation
It refers to the relative value of deviation for actual operating voltage to system voltage, which is expressed with percentage.
3.5
Voltage qualification rate
It refers to the percentage ratio of accumulated operation time and corresponding total operation time for actual operation voltage deviation within limit range.
Contents
Foreword I
1 Scope
2 Normative References
3 Terms and Definitions
4 Limit of Supply Voltage Deviation
5 Measurement of Supply Voltage Deviation
Appendix A (Informative) Statistics of Voltage Qualification Rate
Appendix B (Informative) Monitoring of Power Grid Voltage and Statistics for Qualification Rate of Regional Power Grid Voltage
