GB/T 47024.2-2026Special test methods for electrical equipment at high altitude - Part 2: Combined AC/DC voltage (English PDF)

1 Scope

This document describes the method for conducting power frequency/DC composite voltage tests on electrical products in high-altitude areas, including the test principle, test conditions, and test procedures.

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

This document applies to plateau areas with altitudes above 1000m to 5000m, where AC voltage above 10kV and DC voltage above 3kV are required.

Electrical products subjected to power frequency/DC composite voltage testing.

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 311.1 Insulation Coordination Part 1.Definitions, Principles and Rules

GB/T 1094.3 Power Transformers - Part 3.Insulation Levels, Insulation Tests and Air Gap in External Insulation

GB/T 1408.1 Electrical strength test methods for insulating materials - Part 1.Tests at power frequency

GB/T 4109 Insulating bushings with AC voltage higher than 1000V

GB/T 7354 High Voltage Testing Techniques - Partial Discharge Measurement

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

GB/T 16927.1 High Voltage Testing Techniques - Part 1.General Definitions and Test Requirements

3 Terms and Definitions

The terms and definitions defined in GB/T 16927.1 and the following terms and definitions apply to this document.

4 Experimental Principle

Under high-altitude environmental conditions, a combined power frequency/DC voltage is applied to the test specimen, and the insulation capability of the specimen is tested according to a predetermined test procedure.

examine.

Under the selected power frequency/DC voltage amplitude, the insulation capability test of the test specimen can be carried out using any of the following methods.

a) Apply a power frequency voltage and a DC voltage to the two terminals of the test sample, respectively;

b) Apply a combined power frequency/DC voltage to one terminal of the test specimen.