A handheld partial discharge detector is a portable device for detecting partial discharge, widely used in the maintenance and fault diagnosis of electrical equipment. It helps technicians quickly identify partial discharge phenomena inside electrical equipment, thereby addressing issues early and ensuring the long-term stable operation of the equipment. This article will detail the working principle, usage methods, and important applications of the handheld partial discharge detector.
Working Principle
The working principle of the handheld partial discharge detector is based on the detection of physical phenomena generated during partial discharge, mainly including:
Ultrasonic Detection: Partial discharge generates ultrasonic signals. The handheld partial discharge detector captures these signals through built-in ultrasonic sensors and converts them into electrical signals for analysis.
Transient Earth Voltage (TEV) Detection: TEV is a high-frequency transient voltage generated during partial discharge. TEV sensors capture these signals to help locate the discharge position.
Electromagnetic Field Detection: Partial discharge also causes changes in the electromagnetic field, which are captured by specific sensors for analysis.
By integrating the above detection methods, combined with special algorithms and advanced signal processing technology, the handheld partial discharge detector can accurately and effectively diagnose partial discharge inside electrical equipment and its specific location.
Usage Methods
The general steps for using the handheld partial discharge detector are as follows:
Power-on Preparation: Ensure the instrument is fully charged and in good condition.
Signal Check: Check whether the sensor is working properly, ensuring that a slight, uniform electrical noise is heard in the earphones, and that the curve drawing area on the test interface shows the center line aligned with 0dB, with the average value 10dB lower.
Scanning Detection: Hold the instrument facing the surface of the equipment under test and perform a low-speed uniform scanning detection. When a partial discharge signal is detected, an obvious discharge sound can be heard through the earphones, 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 specific 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.
Setting Parameters: As needed, parameters such as output voltage, units, reading settings, discharge count, and sensors can be set.
Adjusting Trigger Mode: By default, the handheld partial discharge detector main unit selects "Auto" mode. When the instrument does not detect a trigger within a certain period, it forces a trigger.
Application Scenarios
The handheld partial discharge detector is widely used in the following fields:
Power Generation Enterprises: Used to detect partial discharge in large power equipment such as generators and transformers.
Power Supply Systems: Used to detect partial discharge in transmission and distribution lines.
Petrochemical Enterprises: Used to detect the condition of electrical equipment in petrochemical plants.
Railway Power Systems: Used to detect partial discharge in railway power facilities.
Aerospace: Used to detect the condition of electrical equipment in aircraft and other flying vehicles.
Conclusion
The handheld partial discharge detector is one of the important tools for maintaining electrical equipment. By regularly detecting partial discharge phenomena in electrical equipment, it helps electrical engineers promptly identify existing problems, prevent potential faults, and ensure the stable operation of the power system. With continuous technological advancement, handheld partial discharge detectors will become more intelligent and portable, further improving detection efficiency and accuracy.
The above is a detailed introduction to the handheld partial discharge detector. We hope this article provides you with relevant information and technical details about the handheld partial discharge detector. If you need more detailed information or specific case analysis, please feel free to contact us.
