Partial discharge acquisition device and bulb tubular unit partial discharge monitoring and diagnosis system

Abstract

The invention provides a partial discharge acquisition device and a bulb tubular unit partial discharge monitoring and diagnosis system, and relates to the field of partial discharge monitoring, the partial discharge acquisition device comprises a coupler, a terminal junction box connected with a coaxial cable of the coupler, and a partial discharge monitor connected with a coaxial cable of the terminal junction box; and the coupler is arranged at a partial discharge high-voltage wire outlet end of the unit. According to the partial discharge characteristic of a bulb tubular unit, a mica coupler is used as a signal sensor to collect partial discharge pulse signals with a high signal-to-noise ratio, a partial discharge analyzer capable of using a shaping noise analysis technology is used, and the attenuation degree of pulse signal waveforms generated in a generator and at a system end is compared to serve as a judgment basis to determine the partial discharge characteristic of the bulb tubular unit. Noise interference outside the generator is effectively separated, online collection of partial discharge pulse signals with a high signal-to-noise ratio is ensured, and analysis and judgment of the partial discharge pulse signals in the later period are facilitated; meanwhile, the sensitivity and the accuracy of partial discharge on-line monitoring under the condition of thin air in a high-altitude area are solved.

Description

technical field [0001] The invention relates to the field of partial discharge monitoring, in particular to a partial discharge collection device and a partial discharge monitoring and diagnosis system for a bulb tubular unit. Background technique [0002] Water turbines, generators, and transformers are the three main primary equipment in the production equipment of hydropower plants. Despite the rapid development of generator technology, generator accidents are still frequent. According to the statistics of the Electric Power Industry Association, 40% of generator failures come from electrical insulation failures of stator windings. Generator set stator insulation monitoring is currently recognized as a technical difficulty. At present, the mainstream technology for generator insulation monitoring is the pulse current detection method (partial discharge method), but it is limited by the diversification of insulation failure mechanisms (thermal stress, electrical stress, c...

AI Technical Summary

Problems solved by technology

However, the current situation is that the existing partial discharge online monitoring system cannot automatically interpret the partial discharge data, and needs manual interpretation by equipment manufacturers or experienced engineers, which greatly lags behind the partial discharge monitoring system for production and maintenance. Immediate guidance significance; a considerable number of customers are limited by the understanding and analysis of partial discharge data, coupled with the serious impact of interference signals on judgments, resulting in misjudgment, resulting in equipment being idle; , unfortunately, a generator failure and downtime caused by defects in the process structure of the monitoring equipment body occurred, resulting in huge production losses and extremely bad impact on the industry

So far, there is no system in the industry that can effectively solve the intelligent monitoring and early warning of stator core partial discharge, let alone the application and practice of such technology in high altitude areas

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