变压器差分导纳监测匝间短路检测

Gustavo C. B. Leal, M. Meira, C. Ruschetti, Guillermo R. Bossio, C. Verucchi
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引用次数: 0

摘要

电力变压器匝间短路的早期检测对于降低检修成本和减少配电中断次数至关重要。差动保护继电器在这种类型的机器中广泛使用,以检测这种性质的故障。然而,当断层处于初期阶段,只涉及少量间匝时,它们的效果不够好。因此,开发能够早期发现这类故障的策略是很有意义的。本文提出了一种利用差分导纳监测匝间短路的方法。通过对5kva变压器的计算仿真,表明该方法对故障回路中电流为1pu的2%绕组的故障敏感,且对变压器负载状态、负载或电压不平衡、欠压或过压、谐波含量不敏感。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Inter-Turn Short-Circuit Detection Through Differential Admittance Monitoring in Transformers
Detecting inter-turn short-circuits in power transformers at an early stage is essential to reduce repair costs and interruption times of the electrical distribution service. Differential protection relays are widely used in this type of machine to detect faults of this nature. However, they are not effective enough when the faults are in an incipient stage where only a few inter-turns are involved. Therefore, it is of interest to develop strategies that allow early detection of this type of faults. In this work, a strategy for inter-turn short-circuit detection through differential admittance monitoring is proposed. Through computational simulations on a 5 kVA transformer, it is shown that the strategy is sensitive to faults involving from 2% of the winding with a current in the fault loop of 1 p.u. Furthermore, the fault detection strategy is not sensitive to transformer load state, load or voltage unbalance, under or over voltages, and harmonic content.
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