Use of ultrasonic array method for positioning multiple partial discharge sources in transformer oil

Area of Science:

• Electrical Engineering
• Acoustics
• Signal Processing

Background:

• Accurate localization of partial discharge (PD) sources in transformer oil is crucial for ensuring the safe and stable operation of power systems.
• Insulation faults in transformers can lead to multiple PD sources, complicating fault diagnosis and repair.

Purpose of the Study:

• To propose and validate a novel method for identifying and positioning multiple PD sources within transformer oil.
• To enhance the reliability and safety of power systems by enabling timely detection and mitigation of insulation faults.

Main Methods:

• Combines a two-sided correlation transformation algorithm with a modified Gerschgorin disk estimator for signal focusing and identification.
• Employs a multi-platform direction finding and global optimization searching strategy for ultrasonic array positioning.
• Utilizes a 4x4 square planar ultrasonic sensor array and a dedicated detection platform for experimental validation.

Main Results:

• Successfully identified and positioned multiple PD sources in transformer oil using the proposed method.
• Experimental results demonstrated the effectiveness of the combined algorithms and ultrasonic array positioning.
• The method proved to be both valid and practically applicable in an engineering context.

Conclusions:

• The developed method offers a significant advancement in the detection and localization of multiple PD sources in transformer oil.
• This technique contributes to improved power system reliability and proactive maintenance strategies.
• The study validates the engineering practicability of the proposed ultrasonic array positioning approach.