National standards for AC withstand voltage of various electrical systems

It mainly includes the following aspects:

1、 Basic standards

GB/T 16927.1-2011 "AC voltage withstand test for electrical equipment - Part 1: General requirements": This is the basic standard for AC voltage withstand test of electrical equipment in China, applicable to various types of electrical equipment. It provides detailed specifications for the content, standards, and methods of testing. This standard is for the production and testing of electrical equipmentnecessaryOne of the standards.

2、 Specific equipment standards

For different types of electrical equipment, the country has also formulated specific AC withstand voltage test standards. For example:

Cable: Conduct AC withstand voltage test on its insulation according to the requirements of cable specifications and manufacturing standards. The test voltage is usually the rated voltage plus 1kV, with a duration of 15 minutes.

Transformer: Conduct a power frequency insulation voltage test, with the test voltage being the rated voltage plus a certain value (such as 2kV), and the duration being 1 minute. For transformers of different voltage levels, such as 10kV~110kV transformers, the AC withstand voltage test standards are detailed in standards such as GB50150-2016 Electrical Equipment Installation Engineering Handover Test Standards.

Switch: Conduct arc resistance test and insulation resistance test. The test voltage and duration are determined according to specific standards, such as adding 1kV to the rated voltage for 1 minute.

Line: Conduct power frequency withstand voltage test and grounding resistance test, and the test voltage and duration are also determined according to specific standards.

We need to use experimental equipment such as YDJ power frequency test transformer, HVCX-F series resonant withstand voltage device, etc

3、 Insulation material standards

Although the main focus is on the AC withstand voltage standards of electrical equipment, the withstand voltage performance of insulation materials is also an important component of electrical system safety. For the AC withstand voltage standards of insulation materials, such as insulation rubber, there are usually corresponding national or industry standards to regulate them. These standards will provide a detailed list of the AC voltage values that insulation materials of different thicknesses and materials can withstand.

4、 Comprehensive standards

In addition, there are some comprehensive standards that involve multiple aspects of AC withstand voltage in electrical systems, such as GB311.1-83, which specifies the reference insulation level, lightning impulse withstand voltage, and one minute power frequency withstand voltage for 3-500kV transmission and transformation equipment. These standards are of great significance for ensuring the safe operation of electrical systems under various voltage conditions.

5、 Precautions

When conducting AC withstand voltage tests on electrical systems, relevant national standards and industry specifications should be strictly followed to ensure the accuracy and reliability of the test results.

Different types and specifications of electrical equipment may have different AC withstand voltage test standards, so it is necessary to carefully review the relevant standards and make necessary preparations before conducting the test.

The AC withstand voltage performance of insulation materials is also an important component of electrical system safety and requires sufficient attention and concern.

In summary, the national standards for AC withstand voltage of various electrical systems cover multiple aspects such as basic standards, specific equipment standards, insulation material standards, and comprehensive standards. These standards together form an important cornerstone for ensuring the safe operation of electrical systems.