Partial Discharge (PD) is a crucial concept in the field of electrical engineering, which is directly related to the insulation performance, operational stability, and service life of electric motors. In this paper, we will take "What is Partial Discharge" as the theme, and discuss in depth from five aspects: definition, test necessity, test problems, introduction of AIP tester, and summary.

Ⅰ.What is partial discharge

Partial discharge refers to the phenomenon that in the motor insulation system, part of the area is concentrated with electric field intensity due to high voltage or defects in the insulation structure, which in turn triggers the breakdown of the insulation material. This discharge is usually limited to a small area of the insulator, and will not immediately lead to the failure of the entire insulation system, but the long-term accumulation of insulating materials will cause sustained damage, accelerate the insulation aging process, and ultimately may lead to serious insulation breakdown and equipment failure.

Ⅱ. why partial discharge testing of motors is necessary

Partial discharges are electrical discharge phenomena usually caused by broken motor stator coil material, contaminated insulation, or other problems. These discharges are generally localized and usually present inside the motor. If not detected and addressed in a timely manner, localized discharges can lead to motor failure or damage, or even cause a fire.

Ⅲ. Motor partial discharge testing challenges

Partial discharge testing of electric motors faces a number of challenges in practical applications. Firstly, partial discharge signals are weak and easily disturbed, so how to accurately capture and analyze these signals is a big challenge. Secondly, the complex structure of the motor and the variety of insulation materials, different materials, and structures have different effects on partial discharge, making the interpretation and judgment of the test results complicated. In addition, the safe operation of the equipment and the safety of the testers need to be considered during the testing process.

Ⅳ. Introduction to AIP's partial discharge tester

AIP partial discharge tester is a kind of instrument specialized in detecting whether the partial discharge phenomenon occurs in the motor.

①AIP partial discharge tester working principle

Motor partial discharge refers to the discharge phenomenon that occurs locally in the motor. The motor partial discharge tester captures the signals generated during the discharge through the sensors and transmits the signals to the analysis system for processing. Using highly sensitive algorithms and data processing techniques, the motor partial discharge tester's analysis system is able to recognize different types of discharges and determine their location and severity. This data is displayed on the motor partial discharge tester's display through specific values and curves, allowing the user to confirm the presence of partial discharges in the motor.

②Motor partial discharge tester advantages

a. Motor partial discharge tester project integration, convenient testing.

Motor partial discharge tester can test motor PDIV test (including PDS and PDH test), PDEV, RPDIV, RPDEV, inductance, insulation resistance, turn-to-turn impact withstand voltage, temperature sensor resistance, phase-to-phase withstand voltage, and other AC withstand voltage, clamping test, one-stop testing efficient and convenient.

b. Motor partial discharge tester with high sensitivity.

Motor partial discharge testers use highly sensitive sensors and analysis systems to detect small discharge signals, capable of detecting early and subtle discharge phenomena.

c.  Motor partial discharge tester can automatically carry out data recording and analysis.

Motor partial discharge tester can automatically store and analyze the data and curves of the tested motor for subsequent analysis and tracking.

d. Motor partial discharge testers can be used in a variety of industries.

The tester is commonly used in the automobile industry and is widely used in the new energy vehicle drive motor manufacturing industry. Besides, motor partial discharge testers are also widely used in industrial equipment and the military industry.

Ⅴ. Summary

Partial discharge is an important phenomenon in the insulation system of electric motors, which has a significant impact on the operational stability and service life of electric motors. Through partial discharge testing, potential problems in the insulation system can be found in time, the insulation status can be evaluated, and insulation breakdown and equipment failure can be prevented. AIP, as a professional motor testing company, has advanced technology and rich experience in the field of partial discharge testing for motors, and its testing equipment has the advantages of high performance, high reliability, and ease of operation, which provide strong guarantee for the partial discharge testing of motors. Its test equipment has the advantages of high performance, high reliability, and easy operation, which provides a strong guarantee for motor partial discharge tests. In the future, with the continuous development and improvement of the technology, the partial discharge test will play a more important role in guaranteeing safe operation and prolonging the service life of the motor.