Abstract

The use of impedance spectroscopy is described to diagnose the condition of oil in utility transformers. Actual transformer oil samples having different dissolved fault gas and moisture concentrations were characterized by their impedance spectrum from 1 to 100 kHz using an AD5933 device (Analog Devices). The results show that the impedance spectrum of a transformer oil sample is related to its relative saturation percentage (RS). An integrated cloud-connected smart system is described to continuously monitor the condition of the oil in real-time. As proof of concept, the impedance values of oil samples were measured and transmitted to a cloud computing interface for logging and processing. The integrated system is reliable, inexpensive, and suitable for implementation on utility transformers.

摘要

描述了使用阻抗谱来诊断公用事业变压器中的油状况。具有不同溶解故障气体和水分浓度的实际变压器油样品使用 AD5933 器件（模拟器件）通过 1 至 100 kHz 的阻抗谱表征。结果表明，变压器油样品的阻抗谱与其相对饱和百分比（RS）有关。描述了一个集成的云连接智能系统，用于实时持续监控油的状况。作为概念证明，测量了油样的阻抗值并将其传输到云计算接口以进行记录和处理。集成系统可靠、廉价，并且适合在公用变压器上实施。