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Online UHF PD Monitoring for Step-up Transformers of Hydropower Plant

机译:水电站升压变压器的在线UHF PD监测

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摘要

As we known, to evaluate and diagnosis the insulation faults of large-size power transformers, partial discharges (PDs) can be detected via ultra high frequency (UHF) technique. In this paper, an UHF PD online monitoring system was developed for large-size step-up transformers. The principle of UHF PD monitoring method was introduced., and the hardware structure and software key techniques in the system were described. In order to achieve the integrated PD monitoring and ensure the accuracy of PD analysis, the operating environments and operating conditions of the transformers have been acquired synchronously. Meanwhile, the correlative analysis of PDs with respect to operating conditions can be performed and the characteristics of PD activities with respect to relevant states can be studied. The association analysis of PDs is performed as follows: (a) periodical PDs caused by power frequency voltage under stable operating conditions, (b) stochastic PDs caused by transient over-voltages under unstable operating conditions. At present, the system has been applied into several large-size step-up transforms and achieved large mount of on-site monitoring results, and the reliability of PD analyzing results is verified by the analysis of the onsite data.
机译:如我们所知,为了评估和诊断大型电力变压器的绝缘故障,可以通过超高频(UHF)技术来检测部分放电(PDS)。本文为大型升压变压器开发了UHF PD在线监测系统。介绍了UHF PD监测方法的原理。描述了系统中的硬件结构和软件关键技术。为了实现集成的PD监控并确保PD分析的准确性,因此已同步获取变压器的操作环境和操作条件。同时,可以对PDS相对于操作条件的相关性分析,并且可以研究与相关状态的PD活性的特征。 PDS的关联分析如下进行:(a)由稳定操作条件下的功率频率电压引起的周期性PD,(b)在不稳定操作条件下由瞬态过电压引起的随机PD。目前,该系统已被应用于几个大尺寸的升压变换,并实现了大量的现场监测结果,并且通过对现场数据进行分析来验证PD分析结果的可靠性。

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