The portable partial discharge detector is a specialized instrument used for on-site detection of partial discharge phenomena in power equipment. It features portability and ease of operation, and is widely used in the maintenance and fault prevention of power systems. Below is an overview of an article about the portable partial discharge detector.
Portable Partial Discharge Detector
Introduction
Partial Discharge (PD) is a common phenomenon in high-voltage electrical equipment and may be an indication of early faults in the insulation system. Due to its portability and flexibility, the portable partial discharge detector plays an important role in the maintenance and fault prevention of power systems. This article will introduce the main functions, working principles, and usage methods of the portable partial discharge detector.
Main Functions
Non-invasive detection: It can perform detection while the equipment is in operation without the need for power outage.
Multiple detection technologies: It is equipped with various detection technologies such as ultrasonic detection, transient earth voltage (TEV), and ultra-high frequency (UHF).
Data recording and analysis: It can record detection data and provide analysis tools to help users understand discharge characteristics.
Discharge quantity measurement: It can measure the discharge quantity of partial discharges.
Graphical display: It uses a color LCD screen to display the detected partial discharge waveforms, facilitating intuitive analysis.
Location function: Through multi-point detection, it can locate the specific position of partial discharges.
Working Principles
The working principle of the portable partial discharge detector is based on the various physical phenomena that accompany partial discharge, such as ultrasonic waves and electromagnetic waves. The instrument captures these signals through built-in sensors and uses signal processing techniques to identify and analyze partial discharges.
Ultrasonic detection: Uses ultrasonic sensors to receive ultrasonic signals generated by partial discharges.
Transient Earth Voltage (TEV) detection: Determines whether there is internal partial discharge by detecting transient voltage changes on the equipment enclosure.
Ultra-High Frequency (UHF) detection: Captures high-frequency electromagnetic wave signals generated by partial discharges.
Usage Methods
Startup preparation: Set the basic parameters of the instrument according to the manual instructions.
Signal check: Ensure that a slight, uniform electrical noise is heard in the earphones, and that the center line in the curve drawing area on the test interface is aligned with 0 dB, with the average value below 10 dB.
Scanning detection: Hold the instrument facing the switchgear cabinet and perform a low-speed uniform scanning detection. When a PD 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: Perform repeated measurements from different angles on the tested position to eliminate environmental noise interference, and use the laser locator built into the PD 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 at that moment.
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 multifunctional PD tester host selects the "Auto" mode. When the multifunctional PD tester host does not detect a trigger within a certain period, it forces a trigger.
Application Fields
Power generation enterprises: Used to detect the insulation status of key equipment such as generators and transformers.
Power supply systems: Applied to facilities such as substations and distribution rooms to monitor cables, switchgear, and other equipment.
Petrochemical enterprises: Used to detect high-voltage equipment such as large motors and transformers.
Railway power systems: Used for the maintenance of facilities such as rail vehicles and traction substations.
Aerospace: Used to detect high-voltage components in equipment such as aircraft and satellites.
Maintenance and Care
Regular calibration: Calibrate the instrument at the time intervals recommended by the manufacturer to ensure the accuracy of detection results.
Cleaning and maintenance: Regularly clean the instrument surface, especially the sensor parts, to avoid dust affecting detection accuracy.
Storage conditions: Store in a dry, ventilated place, avoiding high temperature and humid environments.
Conclusion
As one of the important tools in power system maintenance, the portable partial discharge detector can help engineers promptly discover and resolve potential partial discharge problems, thereby improving the reliability and safety of the power system.
References
China Chemical Instrument Network: Technical parameters of the GCJF 901 handheld remote ultrasonic partial discharge patrol locator.
Yangzhou Tuopu Electric Technology Co., Ltd.: Introduction to the handheld ultrasonic partial discharge patrol locator.
Toutiao: On the role and functions of the HDJF-9001 handheld remote ultrasonic partial discharge patrol locator.
Bafang Resource Network: Detailed page of the MD9001 handheld ultrasonic partial discharge patrol locator.
Wuhan Kaidi Zhengda: Related information on the KDJF-800 partial discharge tester.
Yangzhou Darui: Product description of the ultrasonic partial discharge patrol locator.
