Ultrasonic detection: When partial discharge occurs, in addition to electromagnetic radiation, it is accompanied by mechanical vibrations and sound waves. These acoustic signals can propagate in air or other media and can be captured by ultrasonic sensors within a certain distance.
Signal processing: The captured ultrasonic signals are amplified and filtered, then can be listened to via headphones or displayed on the instrument, helping technicians to locate and assess faults.
Positioning technology: Advanced positioning technologies (such as laser positioning or acoustic imaging) are used to precisely locate the discharge source, guiding maintenance personnel in troubleshooting.
Technical Features
Portability: Handheld design for easy carrying and on-site operation.
High sensitivity: Capable of detecting very weak partial discharge phenomena.
Multi-mode detection: Supports multiple detection modes, such as ultrasonic and transient earth voltage (TEV), to suit different types of electrical equipment.
Intelligent analysis: Built-in intelligent algorithms can automatically identify and analyze partial discharge types.
Anti-interference capability: Good anti-interference capability to accurately detect signals in complex electromagnetic environments.
Usage Method
Startup preparation: Ensure the tester is calibrated and the battery is sufficiently charged.
Signal check: In the absence of abnormal signals, ensure a slight, uniform buzzing electrical noise is heard in the headphones, and the curve drawing area on the test interface shows the center line aligned to 0dB, with the average value 10dB lower.
Scanning detection: Hold the instrument towards the switchgear cabinet surface and perform a low-speed uniform scanning detection. When a partial discharge signal is detected, a clear discharge sound can be heard through the headphones, while the amplitude curve on the screen rises, and both the average and maximum values increase.
Locating the discharge point: The inspector can repeatedly measure the tested position from different angles to eliminate environmental noise interference, and use the laser locator built into the partial discharge detector to determine the exact location of the discharge point.
Saving results: After confirmation, click the save button on the device screen to store the test results for later management, analysis, and targeted maintenance.
Application Fields
Power systems: Suitable for inspection of electrical equipment in core fields such as power generation enterprises, power supply systems, petrochemical enterprises, railway power systems, and aerospace.
Substation maintenance: Used for preventive maintenance of various electrical equipment in substations.
Electrical equipment manufacturing: Used on production lines to detect whether newly manufactured electrical equipment has partial discharge phenomena.
Conclusion
The handheld partial discharge detector is one of the indispensable tools in power system maintenance. Regular partial discharge detection not only allows timely discovery of potential insulation problems but also effectively reduces economic losses and social impacts caused by equipment failures. With technological advancements, this detection method will become more efficient and accurate, providing stronger support for the safe and stable operation of power systems.
The above content provides an overview of the handheld partial discharge detector. It should be noted that different models and brands of equipment may have different features and usage methods. Before actual operation, please refer to the specific user manual and technical documentation.
