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高压电器  2015 

以不停电检测状态量为主的变压器故障诊断方法研究

DOI: 10.13296/j.1001-1609.hva.2015.11.027, PP. 161-167

Keywords: 电力变压器,故障诊断,分步诊断,不停电检测状态量,粗糙集理论

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Abstract:

目前被广泛研究和使用的是融合多种状态量的变压器综合诊断方法,该方法提高了诊断的准确性,但同时也带来了一些问题,主要问题在于这种方法需要的状态量多、诊断效率低、导致停电时间过长。因此,文中提出了一种以不停电检测状态量为主的分步诊断方法,其包括初步诊断和精细诊断两个阶段。初步诊断阶段仅以不停电检测状态量为诊断依据,在无需停电的状态下将变压器故障分为热故障、电故障、受潮或脏污、变形4大类;在精细诊断阶段,根据初步诊断结果,选择出多种必要的停电试验信息,并利用故障机理和粗糙集理论进行进一步的故障确认和细分,判断发生的位置。与其他方法相比,该诊断方法可以缩短停电时间、提高诊断效率。最后,诊断实例验证了该方法的有效性。

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