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Power Knowledge | Transformer Partial Discharge Detection Technology and Its Application
2025-04-15
I. Introduction to Partial Discharge
Partial discharge refers to a weak discharge phenomenon occurring in a local area of electrical equipment. In transformers, partial discharge may occur in parts such as windings, bushings, and porcelain insulators. Partial discharge will lead to the insulation aging of electrical equipment, thereby affecting its service life and safety.
Partial discharge refers to a weak discharge phenomenon occurring in a local area of electrical equipment. In transformers, partial discharge may occur in parts such as windings, bushings, and porcelain insulators. Partial discharge will lead to the insulation aging of electrical equipment, thereby affecting its service life and safety.
II. Hazards of Partial Discharge
- Accelerating Insulation Aging: Partial discharge will generate chemical reactions, producing harmful substances such as oxides and acidic substances, leading to the aging of insulation materials.
- Thermal Effect: The energy generated by partial discharge will cause the temperature of insulation materials to rise, accelerating the aging process.
- Mechanical Effect: The pulsed force generated by partial discharge will cause damage and cracking of insulation materials.
- Reducing System Reliability: Partial discharge may lead to sudden equipment failures, affecting the stable operation of the power system.
III. Partial Discharge Detection Methods
- Electrical Detection Method: By detecting the electrical wave signals generated by the partial discharge of the transformer, such as the pulsed current method and the electromagnetic wave method.
- Ultrasonic Detection Method: By detecting the ultrasonic signals generated by partial discharge, the location and diagnosis of the discharge phenomenon can be realized.
- Optical Detection Method: Using the optical radiation signals generated by partial discharge for detection, such as the photoacoustic wave method and the photocurrent method.
- Gas Detection Method: Monitoring the gases generated during the partial discharge process, such as the gas chromatography method and the gas sensor method.
IV. Applications of Partial Discharge Detection
- Transformer Condition Assessment: Partial discharge detection data can be used to evaluate the insulation condition and remaining life of the transformer, providing a basis for the preventive maintenance of the equipment.
- Fault Diagnosis: Partial discharge detection can assist in judging the abnormal phenomena inside the transformer and provide early warnings of potential faults.
- Equipment Improvement: By analyzing the partial discharge detection data, the deficiencies in the design and manufacture of the transformer can be identified, providing a reference for equipment improvement and optimization.
- Maintenance Decision-making: The results of partial discharge detection are helpful in formulating targeted maintenance plans, reducing the equipment failure rate, and improving the operation reliability.
- Monitoring and Early Warning: Combined with the online monitoring system, partial discharge detection can monitor the operation status of the transformer in real time, realize fault early warning, and avoid accidents.
V. Conclusion
The partial discharge detection technology is of great significance for the operation, maintenance, and fault diagnosis of transformers. By using a variety of detection methods, a comprehensive understanding of the partial discharge phenomenon of transformers can be obtained, providing strong support for equipment condition assessment, fault diagnosis, and maintenance decision-making. With the development of technology, partial discharge detection will play a greater role in improving the operation safety and reliability of transformers.
The partial discharge detection technology is of great significance for the operation, maintenance, and fault diagnosis of transformers. By using a variety of detection methods, a comprehensive understanding of the partial discharge phenomenon of transformers can be obtained, providing strong support for equipment condition assessment, fault diagnosis, and maintenance decision-making. With the development of technology, partial discharge detection will play a greater role in improving the operation safety and reliability of transformers.
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