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首页> 外文会议>2013 IEEE 1st International Conference on Condition Assessment Techniques in Electrical Systems >Frequency domain spectroscopy of oil-paper insulation under sinusoidal and square wave excitations
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Frequency domain spectroscopy of oil-paper insulation under sinusoidal and square wave excitations

机译：正弦波和方波激励下油纸绝缘体的频域光谱

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摘要

It is well known that the sinusoidal voltages over a wide frequency range are used in laboratory for Frequency Domain Spectroscopy of oil-paper insulation. But in practice, when a transformer remains in operating condition, the insulation inside the transformer is often stressed by the voltage that deviate significantly from sinusoid due to presence of harmonics. So, use of non-sinusoidal excitation voltage is required in advanced diagnostic technique for proper monitoring of insulation condition. Considering the facts, an arrangement has been made in laboratory that can generate sinusoidal as well as non-sinusoidal excitations over a wide frequency range. Square wave excitation has been chosen here as non-sinusoidal excitation. Samples with different preset moisture contents have been prepared in the laboratory for experimental purposes that emulate the oil-paper insulation of actual power transformer. Sinusoidal as well as square wave excitations over a wide frequency range are applied across the samples under controlled environmental conditions and corresponding dielectric response currents are measured. From applied excitation voltages and corresponding response currents, dielectric dissipation factors are calculated for both excitations. The parameters are then plotted and compared with each other. It may be observed that use of square wave excitation provides better information regarding the condition of insulation.
机译：众所周知，实验室使用宽频率范围的正弦电压进行油纸绝缘的频域光谱分析。但是实际上，当变压器保持工作状态时，由于谐波的存在，变压器内部的绝缘层通常会受到与正弦波明显偏离的电压的压力。因此，在先进的诊断技术中需要使用非正弦激励电压来正确监测绝缘状况。考虑到事实，在实验室中已经做出了可以在宽频率范围内产生正弦和非正弦激励的装置。方波激励在这里被选作非正弦激励。在实验室中已准备了具有不同预设水分含量的样品，用于模拟实际电力变压器的油纸绝缘的实验目的。在可控的环境条件下，将宽频率范围内的正弦波激励和方波激励施加到样品上，并测量相应的介电响应电流。根据施加的激励电压和相应的响应电流，可以计算出两种激励的介电损耗因子。然后绘制参数并相互比较。可以观察到，使用方波激励可以提供有关绝缘状况的更好信息。

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