Ultrasonic partial discharge detector is a professional tool used to detect partial discharge phenomena in power equipment. This detector utilizes ultrasonic sensors to capture acoustic signals generated during partial discharge, thereby helping to identify and locate potential insulation problems. Below is an overview of an article about the ultrasonic partial discharge detector.
Ultrasonic Partial Discharge Detector
Partial Discharge (PD) refers to the discharge phenomenon that occurs in local areas of the insulation system of power equipment when the applied voltage reaches a certain level. This phenomenon typically occurs in high-voltage equipment such as transformers, switchgear, cable terminations, etc., and may lead to performance degradation or even failure of the equipment. The ultrasonic partial discharge detector can effectively detect these partial discharge phenomena, helping maintenance personnel to identify and resolve problems early.
Working Principle
The working principle of the ultrasonic partial discharge detector is based on the acoustic signals generated during partial discharge. When partial discharge occurs, in addition to electromagnetic radiation, a series of acoustic effects are produced, including ultrasonic signals. These signals can be captured by ultrasonic sensors and analyzed through built-in signal processing technology.
The specific steps are as follows:
Signal Capture: The ultrasonic sensor captures the ultrasonic signals generated during partial discharge.
Signal Amplification: The weak ultrasonic signals are amplified through a preamplifier.
Signal Filtering: Background noise is removed through filters, retaining only effective ultrasonic signals.
Signal Analysis: The signals are analyzed through software to identify the characteristics of partial discharge.
Location and Assessment: Based on changes in signal strength and the directionality of ultrasonic waves, the location of partial discharge is determined, and its severity is assessed.
Main Functions
Ultrasonic Detection: Captures acoustic signals generated by partial discharge through ultrasonic sensors.
Laser Positioning: Uses a laser pointer to assist in locating the specific position of partial discharge.
Image Acquisition: Combines a camera to capture images of the partial discharge area.
Waveform Recording: Records the waveform of partial discharge for further analysis.
Intelligent Cloud System: Uploads data to the cloud for remote analysis and support.
Usage Scenarios
Transformers: Detects partial discharge inside transformers.
Switchgear: Detects partial discharge in switchgear.
Cable Terminations: Detects partial discharge in cable terminations and joints.
Gas Insulated Switchgear (GIS): Detects partial discharge in GIS.
Power Cables: Detects partial discharge in power cables.
Operating Steps
Power On and Setup: Turn on the detector and set the basic parameters according to the manual.
Connect Sensor: Connect the appropriate ultrasonic sensor based on detection requirements.
Scan Detection: Hold the instrument and scan the target equipment to search for partial discharge signals.
Signal Analysis: Listen to ultrasonic signals through headphones and observe the waveform on the display.
Location and Recording: Use the laser pointer to help locate the discharge position and record data.
Data Analysis: Use built-in or external software for data analysis to determine the nature and severity of the discharge.
Precautions
Environmental Factors: Pay attention to the noise level of the detection environment, and try to choose a quiet environment for detection.
Sensor Selection: Choose the appropriate ultrasonic sensor based on the type of equipment being tested.
Safe Operation: Follow safety regulations to ensure personal safety during the detection process.
Instrument Calibration: Regularly calibrate the detector to ensure the accuracy of detection results.
Conclusion
The ultrasonic partial discharge detector is one of the important tools for power system maintenance and fault prevention. Through effective detection of partial discharge phenomena, problems in the insulation system can be identified early, thereby taking necessary measures to extend the service life of equipment and ensure the safe and stable operation of the power grid.
References
Environmental Protection Online: Explanation of the detection principle of ultrasonic partial discharge inspection instruments.
Baidu Experience: How to use SDT ultrasonic detector for electrical partial discharge detection (1).
Zhihu: Market status and future development trends of handheld ultrasonic partial discharge detectors.
Sohu: Principle of ultrasonic partial discharge detector.
