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GB/T 14549-1993Quality of electric energy supply--Harmonics inpublic supply network (English PDF)

电能质量公用电网谐波

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

July 31, 1993

Implementation date

March 1, 1994

Scope

GB/T 14549-1993 is the English-translated version of 电能质量公用电网谐波.

GB/T 14549-1993 is the Chinese national standard fixing how much harmonic distortion the public supply network may carry, and how it is measured.

It sets harmonic voltage limit values for phase voltage, allowable values for the harmonic current injected into a point of common coupling, and the rule that each user share is allocated in proportion to its agreed capacity at that point against the supply capacity of the point.

It defines point of common coupling, harmonic measurement point, fundamental, harmonic order and harmonic content, and gives the expressions for harmonic ratio and total harmonic distortion, the conversion for other short-circuit capacities, and the measuring method, data processing and instruments.

It applies to 50 Hz networks of 110 kV and below and excludes transient phenomena and short-term harmonics. Issued on 31 July 1993, it has applied since 1 March 1994.

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Document preview — GB/T 14549-1993

National Standard of the People's Republic of China

Classification: F 20

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

1 Subject Contents and Applicable Scope3
2 Normative References3
3 Terms3
4 Harmonic Voltage Limit Value4
5 Harmonic Current Allowable Value5
6 Measurement6
Appendix A Mathematical Expression of Harmonic Terms (Supplement)7
Appendix B Conversion of Allowable Value of Harmonic Current (Supplement)9
Appendix C Basic Calculation Formula of Harmonics (Supplement)10
Appendix D Method for Measuring Harmonics, Data Processing and Measuring Instrument (Supplement) Additional Information12

1 Subject Contents and Applicable Scope

This Standard specifies the allowable values and test methods for the harmonics in public supply network.

This Standard is applicable to the public supply network with AC rated frequency of 50Hz, nominal voltage of 110kV and below.

The public supply network with nominal voltage of 220kV can be implemented with reference to 110kV.

This Standard is not applicable to the transient phenomena and short-term harmonics.

2 Normative References

GB 156 Rated Voltage

3 Terms

3.1 Point of common coupling

The position where the user access to the public supply network.

3.2 Harmonic measurement points

The position where the supply network and user's harmonics are measured.

3.3 Fundamental (component)

The component with the same frequency and power frequency obtained by the Fourier series decomposition performed against the AC quantity.

3.4 Harmonic (component)

The component with the frequency greater than 1 integral multiple of the fundamental frequency obtained by the Fourier series decomposition performed against periodic AC quantity.

3.5 Harmonic order (h)

The integer ratio between the harmonic frequency and the fundamental frequency.

3.6 Harmonic content (for voltage or current)

The amount obtained by subtracting the fundamental component from the periodic AC quantity.

4 Harmonic Voltage Limit Value

The harmonic voltage (phase voltage) limit value of public supply network can refer to Table 1.

5 Harmonic Current Allowable Value

5.1 The harmonic current component (root-mean-square value) injected by all users of the point of common coupling to such point shall not exceed the allowable values specified in Table 2.

5.2 The allowable value of the harmonic current injected into the supply network by each user of the same point of common coupling shall be assigned by the ratio between the user's protocol capacity at such point and the power supply capacity of the point of common coupling. The allocation calculation shall refer to Appendix C (supplement).

6 Measurement

The provisions on the measuring method of harmonics, data processing and measuring instrument can refer to Appendix D (Supplement).

Appendix A Mathematical Expression of Harmonic Terms (Supplement)

A.1

The hth harmonic voltage ratio of HRUh

A.3 Harmonic content for voltage of UH

A.4 Harmonic content for current of IH

A.5

The total harmonic distortion of voltage of THDu

A.6 The total harmonic distortion of current of THDi

Appendix B Conversion of Allowable Value of Harmonic Current (Supplement)

When the minimum short-circuit capacity of the point of common coupling in the supply network is different from the reference short-circuit capacity in Table 2, modify the allowable value of harmonic current in Table 2 as per the following formula. […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 14 pages — is available in the English PDF.

Referenced standards

Normative references

GB 156

Cited by

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