Abstract
The paper reports on the solution, principles, and application results related to a system for diagnosing main transformers in power plants via the radiofrequency method. The subject of the diagnostics is the occurrence of partial discharge activity in transformers. The technical solution of the system is characterized in the introductory section of the article. There then follows a description of the operating principle and the implemented novel advanced methods for signal detection and source localization. The results obtained from practical application of the system within the diagnostics of high-power transformers are presented as well. Because ambient electromagnetic disturbance was recognized as a major issue during the system development, novel detection methods were proposed, implemented, and verified. The principal approach utilizes an external radiofrequency sensor to detect outer impulse disturbance and to eliminate disturbance-triggered acquisitions, and it also ensures direct real-time visualization of the desired impulse signals. The ability of weak signal detection was verified via artificial impulse signal injection into the transformer. The developed detection methods were completed with localization techniques for signal source estimation. The desired impulse signal was detected and localized during full operation of the main transformer, despite the presence of strong electromagnetic interference.
Highlights
Reliable production and distribution of electrical energy are important preconditions for sustainable development within industry and, generally, human society
Intensively developed method is the acoustic approach, which detects the sound emitted by the partial discharge (PD), mainly at ultrasonic frequencies [5]
Several precautions consists in the real-time detection and localization of partial discharges
Summary
Reliable production and distribution of electrical energy are important preconditions for sustainable development within industry and, generally, human society. One of the key components within the chain is a main transformer (generator transformer) in a power plant. This device transforms the voltage level on the output of a turbine-driven generator (typically around 20 kV) to a level suitable for long-distance electricity transmission Since the voltage level handled by a main transformer can reach up to hundreds of kilovolts, the resulting high electric field intensity places strict. Combined paper-oil windingwinding insulation is frequently used in power transmission and associated power loss. Combined paper-oil insulation is frequently such transformers
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