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GB/T 47024.1-2026Special test methods for electrical equipment at high altitude - Part 1: Combined power frequency and harmonic current (English PDF)

高原电工产品特殊试验方法　第1部分：工频/谐波复合电流

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

January 28, 2026

Implementation date

May 1, 2026

Scope

GB/T 47024.1-2026 is the English-translated version of 高原电工产品特殊试验方法　第1部分：工频/谐波复合电流.

GB/T 47024.1-2026 is the Chinese standard "Special test methods for electrical equipment at high altitude - Part 1: Combined power frequency and harmonic current".

Its scope clause reads: This document describes the methods for conducting breaking capacity and temperature rise tests on electrical products in high-altitude areas under combined power frequency/harmonic current conditions, including testing...

Test principle, test conditions, test circuit and parameter calculation, test procedure, test result evaluation and test report. This document applies to high-altitude plateau regions (above 1000m to 5000m) and substations with high harmonic content (10kV and above) requiring construction work.

Electrical products subjected to breaking capacity and temperature rise tests under combined frequency/harmonic current. For electrical products at other altitudes, the same guidelines apply. Its clauses include terms and definitions.

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Document preview — GB/T 47024.1-2026

National Standard of the People's Republic of China

ICS: 29.020
Classification: K 40

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

Preface
Introduction
1.Scope
2 Normative References
3.Terms and Definitions
4.Experimental Principle
5.Test conditions
6.Test circuit and parameter calculation
7.Experimental Procedure
8.Evaluation of Test Results
9 Test Report
Appendix A (Informative) Plateau Climate and Environmental Conditions Parameters
Appendix B (Normative) Typical Test Circuits

1 Scope

This document describes the methods for conducting breaking capacity and temperature rise tests on electrical products in high-altitude areas under combined power frequency/harmonic current conditions, including testing...

Test principle, test conditions, test circuit and parameter calculation, test procedure, test result evaluation and test report.

This document applies to high-altitude plateau regions (above 1000m to 5000m) and substations with high harmonic content (10kV and above) requiring construction work.

Electrical products subjected to breaking capacity and temperature rise tests under combined frequency/harmonic current.

For electrical products at other altitudes, the same guidelines apply.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 1984 High Voltage AC Circuit Breakers

GB/T 1094.2 Power Transformers - Part 2.Temperature Rise of Liquid-Immersed Transformers

GB/T 10230.1 Tap changers - Part 1.Performance requirements and test methods

GB/T 10230.2 Tap changers - Part 2.Application guidelines

Common technical requirements for GB/T 11022 High-voltage AC switchgear and controlgear standards

GB/T 14549 Power Quality - Harmonics in Public Power Grids

GB/T 20626.1-2017 Electrical and electronic products for high-altitude environments under special conditions - Part 1.General technical requirements

DL/T 5222 Conductor and Electrical Equipment Selection and Design Code

3 Terms and Definitions

The terms and definitions defined in GB/T 1984, GB/T 10230.1, GB/T 10230.2 and GB/T 14549, as well as the following terms and definitions, apply to this document.

document.

3.1

Fourier series decomposition of periodic alternating current yields components with the same frequency as the power frequency.

[Source. GB/T 14549-1993, 3.3]

3.2 Harmonic components

Fourier series decomposition of periodic alternating currents yields components whose frequencies are integer multiples of the fundamental frequency.

[Source. GB/T 14549-1993, 3.4]

3.3 harmonic order

The integer ratio of harmonic frequency to fundamental frequency.

[Source. GB/T 14549-1993, 3.5] […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 12 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 1094.2

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