As of 2025, GIS (gas-insulated switchgear) partial discharge test technology has made significant progress, and the new technology has significantly improved in terms of sensitivity, efficiency, and intelligence. The following are several new technologies and their characteristics in GIS partial discharge tests:
1. Ultra high frequency (UHF) detection technology
Principle: The UHF electromagnetic wave signal (300MHz~3GHz) generated by the GIS internal partial discharge is detected.
Advantages:
High sensitivity can detect weak partial discharge signals.
Strong anti-interference ability, suitable for complex electromagnetic environment.
Application: Widely used in online monitoring and offline testing, especially suitable for long-term operation status assessment of large GIS equipment.
2. Ultrasonic detection technology
Principle: By receiving the ultrasonic signal generated by partial discharge (20kHz~300kHz) for positioning and analysis.
Advantages:
Local power supply can be accurately located.
It is suitable for the early detection of partial discharge.
Application: It is often used for on-site inspection and fault location, especially for the detection of mechanical defects in GIS.
3. Ultra-high frequency (TEV) detection technology
Principle: The transient ground voltage (TEV) signal generated by partial discharge on the ground potential metal surface is detected.
Advantages:
Easy to operate, suitable for quick inspection.
Can be detected without touching the equipment.
Application: Used for routine maintenance and troubleshooting of GIS equipment.
4. Artificial Intelligence (AI) and big data analytics
Principle: AI algorithm and big data analysis technology are used for the intelligent identification and diagnosis of partial discharge signals.
Advantages:
Improve the accuracy and efficiency of signal recognition.
Anticipate potential equipment failures for preventive maintenance.
Application: Combined with an online monitoring system, it is used for the intelligent operation and maintenance of GIS equipment.
5. Multi-sensor fusion technology
Principle: Combined with UHF, ultrasonic, TEV, and other detection methods, comprehensive analysis of partial discharge signal.
Advantages:
Improve the comprehensiveness and reliability of testing.
The type of partial discharge can be located and identified more accurately.
Application: It is suitable for comprehensive detection and fault diagnosis of GIS equipment.
These new technologies significantly improve the efficiency and accuracy of the GIS partial discharge test and provide a strong guarantee for the reliable operation of equipment. With the continuous development of technology, the GIS partial discharge test will be more intelligent and accurate in the future and provide more comprehensive support for the safe operation of the power system.