An Analysis of Low Pressure on Partial Discharge in Micro Voids in Aviation

Introduction

Analysis of the influence of low voltage on partial discharge of micropores in aviation

With the increasing complexity of avionics equipment and aircraft electrical systems, microvoids and partial discharge (PD) issues are gaining increasing attention in electrical equipment in the aviation field. Partial discharge is a common electrical fault phenomenon in high-voltage electrical equipment, especially in insulating materials with micropores or defects. Micropores, as an intrinsic defect, usually exist at a microscopic scale in insulating materials. These tiny gas bubbles are often the source of partial discharge. The low-voltage environment has an important influence on the partial discharge phenomenon in micropores. This paper will analyze the influence of low voltage on partial discharge of micropores and its application in aviation systems from multiple perspectives.

 

Basic concepts of micropores and partial discharge

Partial discharge is an electrical discharge phenomenon that usually occurs under the action of a high-voltage electric field, where the current locally passes through the defective area of ​​the electrical insulating material to generate discharge. Micropores usually refer to bubbles or air pockets with a diameter of micrometers, which can exist in solid insulating materials (such as plastics or rubber). The presence of these pores impairs the electrical properties of the insulating material, leading to the occurrence of partial discharge.

The main characteristics of partial discharge are small discharge energy and short duration, but its long-term impact on insulating materials cannot be ignored. Micropores are prone to become hidden dangers of partial discharge due to their small size and uneven distribution. As the discharge phenomenon gradually accumulates, it may lead to aging, breakdown or even failure of insulating materials.

The influence of low voltage on partial discharge of micropores

In a low-voltage environment, the occurrence and development of partial discharge are affected by many factors. The characteristics of partial discharge under low voltage are usually manifested as lower discharge frequency and smaller discharge energy. Specifically, the characteristics of partial discharge under low voltage include the following aspects:

1. Low discharge starting voltage:In a low-voltage environment, due to the low electric field strength, the threshold voltage for the occurrence of partial discharge is usually low. Although the electric field strength of micropores is not enough to produce complete discharge, partial discharge will still occur under certain conditions, especially in the electric field enhancement area around the pores.
2. Short discharge duration: Local discharge under low voltage environment usually lasts for a short time and has less energy. Because the electric field under low voltage is not enough to maintain a stable discharge process, the discharge phenomenon is mostly in a pulse type or short instantaneous discharge.
3. Amplification of micropore effect: Under low pressure, the effect of micropores may be amplified. The presence of pores will change the local electric field distribution, resulting in uneven local electric field strength and forming hot spots of partial discharge. When the electric field reaches a certain level, partial discharge may occur even in a low-pressure environment.

The impact of micropore partial discharge and its application in aviation

In the aviation field, the safety of electrical equipment is of vital importance. The impact of low voltage on micropore partial discharge may cause the following problems:

1. Insulation aging: The impact of partial discharge on insulating materials cannot be ignored, especially in the presence of micropores, the discharge phenomenon will accelerate the aging process of insulating materials. The discharge caused by micropores will cause changes in the molecular structure of insulating materials, thereby reducing their voltage resistance and increasing the risk of failure.

4. Equipment failure: Long-term partial discharge will gradually degrade the insulation performance of aviation electrical equipment and may cause functional failure of the equipment. Especially during flight, changes in environmental conditions may cause fluctuations in the intensity of partial discharge, thereby exacerbating the occurrence of failures.
5. Detection and prevention challenges: Since the characteristics of partial discharge under low voltage are not as obvious as those under high voltage, traditional detection methods may find it difficult to accurately capture the partial discharge phenomenon caused by micropores. This poses a great challenge to the maintenance and prevention of aviation equipment.

Solutions and Future Development

In order to reduce the impact of microporous partial discharge in low-voltage environments, the aviation field is taking a variety of measures:

1. Material improvement:Use high-performance insulating materials, especially composite materials that can maintain good electrical properties in low-voltage environments, to reduce the generation of micropores and the occurrence of partial discharge.
2. Partial discharge monitoring technology: Develop more sophisticated partial discharge detection technology, such as sensor-based online monitoring systems, which can capture tiny discharge phenomena in real time and provide data support for the maintenance and fault prediction of aviation equipment.
3. Optimized design: Optimize the design of electrical equipment, reduce micropores and other defects in electrical components, avoid the occurrence of partial discharge, especially in low-voltage environments, and ensure the long-term stability of electrical systems.

 

Conclusion

The impact of low voltage on partial discharge of micropores in aviation cannot be ignored, especially in high-performance electrical systems, where micropores may become the source of partial discharge, causing problems such as insulation aging and equipment failure. By improving materials, strengthening detection and optimizing design, the negative impact of micropore partial discharge in low-voltage environments can be effectively mitigated to ensure the safety and reliability of aviation equipment. With the continuous advancement of technology, future aviation electrical systems are expected to achieve higher performance and stability while reducing the risk of partial discharge.For more related content, you can visit the professional electronic components supplier, DRex Electronics.