In the modern power industry, SF6 (sulfur hexafluoride) gas is widely used in high-voltage electrical equipment because of its excellent insulation properties and arc extinguishing ability. However, the moisture content of SF6 gas has a significant impact on its performance and safety. Therefore, the identification of micro-water tester is particularly important. This paper will discuss the identification basis of SF6 gas moisture tester and how to ensure its reliability in practical applications.

First, the importance of micro-water content

When SF6 gas is used in electrical equipment, the control of moisture content is very important. The presence of moisture may reduce the insulation performance of the gas and even cause equipment failure. The chemical reaction of water and SF6 gas will produce corrosive substances, which will affect the service life of the equipment. Therefore, regular detection of the micro-water content in SF6 gas is a necessary measure to maintain equipment safety and performance.

Secondly, Specifications and standards based on identification

The identification basis of micro-water tester mainly comes from national and international standards. Here are some key standards and regulations:

1. IEC 60376: This standard provides guidance on the purity and gas quality of SF6 gases, covering the composition of the gas and the permissible range of impurities.

2. GB/T 12022: This is China’s standard for SF6 gas, which specifies the technical requirements and test methods of the gas, including the determination of micro-water content.

3. ASTM D 7030: This international standard provides procedures for measuring moisture content in gases and is applicable to a variety of gases, including SF6.

4. ISO 8573: Although this standard is mainly for compressed air, its classification and determination of moisture can also provide a reference for the detection of moisture content of SF6 gas.

Third, the working principle of the micro-water tester

Micro water tester usually uses different technical principles for moisture measurement, including:

Capacitance method: The moisture content is determined by measuring the change of moisture in the capacitor. The method has high sensitivity and is suitable for the detection of low concentration water.

Spectroscopy: infrared spectroscopy technology is used to detect the absorption characteristics of water in gas. This method has the advantage of being fast and accurate.

Condensation method: The moisture content is calculated by cooling the gas to the dew point temperature and measuring the amount of condensed water. Although this method is more traditional, it is still widely used in some cases.

Four, the selection and application of micro-water tester

When choosing a micro-water tester, the user should consider the following factors:

1. Measuring range: The measuring range of different equipment is different, and the suitable instrument can better meet the specific needs.

2. Accuracy and sensitivity: Instruments with high precision and sensitivity can provide more reliable test results, especially in the case of low micro-water content.

3. Portability and ease of operation: In field testing, the portability and ease of operation of the instrument is particularly important, which can improve work efficiency.

4. Data processing capability: Modern micro-water testers are usually equipped with data recording and analysis functions, which can provide support for equipment management.

5. Implementation and precautions of micro-water testing

When conducting micro-water testing, operators should follow the following steps to ensure the accuracy of test results:

Equipment preparation: Ensure that the test instrument is operating in good condition and is calibrated and maintained regularly.

Sample collection: When collecting gas samples, secondary pollution of water should be avoided to ensure the representativeness of the samples.

Test environment: During the test, keep the environment stable to avoid drastic changes in temperature and humidity affecting the results.

The SF6 gas micro-water tester is certified based on multiple standards and technical requirements, which provide a guarantee for the safe operation of the power industry. With the advancement of technology, the performance and function of the micro-water tester continue to improve, and can better adapt to the needs of the industry. It is the important responsibility of every power worker to ensure the quality of SF6 gas and protect the safety and reliability of high-voltage electrical equipment through scientific testing means.