Converter transformer operating state on-line audio analyzing and monitoring system

Abstract

A converter transformer operating state on-line audio analyzing and monitoring system belongs to the field of monitoring devices. The system comprises a sound collection unit, a sound transmission unit, a sound analysis unit, a historical sound library, and an analysis result comparison and analysis unit, which are sequentially connected. The sound collecting unit collects actual operating sounds of a converter transformer and converts the sounds into electrical signals. The sound transmission unit transmits the electrical signals converted from the collected actual operating sounds of the converter transformer to the sound analysis unit. The sound analysis unit conducts audio decomposition of the electrical signals converted from the collected actual operating sounds of the converter transformer and forms typical amplitude and frequency curves of the converter transformer on different operating conditions. The historical sound library stores the typical amplitude and frequency curves of the converter transformer on different operating conditions for comparison and comparative analysis. The analysis result comparison and analysis unit is used for analysis and comparison of newly collected audios of the converter transformer, analysis and comparison of historical sounds, and automatic alarming when the collected operating sounds of the converter transformer is abnormal.

Description

technical field [0001] The invention belongs to the field of monitoring devices, in particular to a system for monitoring the running state of a converter transformer. Background technique [0002] Up to now, 13 long-distance super- and UHV DC transmission lines and 2 back-to-back converter stations have been built and put into operation in China. According to relevant plans, 15 DC projects will be started during the "12th Five-Year Plan" period, with a total conversion capacity of 230 million kW and a total line length of 25,000 km, including 13 DC projects of plus or minus 800kV and one project of plus or minus 1100kV. [0003] Converter Transformer (Converter Transformer) refers to the power transformer connected between the converter bridge and the AC system. The converter bridge provides a three-phase commutation voltage whose neutral point is not grounded, and the converter transformer and the converter bridge are the main components of the converter unit. [0004] T...

AI Technical Summary

Problems solved by technology

[0008] However, in the daily inspection work of existing operating personnel, there is a lack of necessary technical monitoring means for abnormal sounds such as louder sounds caused by the DC bias magnetism of the converter, abnormal discharge sounds, and mechanical failures of internal and external components. The inspection work is mainly to use the inspectors to identify and judge the "whether the running sound of the converter is abnormal" by human ears. The judgment results vary from person to person, and there is a lack of quantitative indicators and criteria

Images