Determination of Dissolved Gas Limits in Insulating Oil of Vacuum on-Load Tap Changer in Power TransformersDetermination of Dissolved Gas Limits in Insulating Oil of Vacuum on-Load Tap Changer in Power Transformers
DOI:
https://doi.org/10.5281/zenodo.13208915Keywords:
On-load tap changer, dissolved gas, duval triangle, outlier.Abstract
In power transformers, which are widely used in the electricity transmission system, voltage adjustment is performed by means of on-load tap changers (OLTC). One of the commonly used types of on-load tap changers is vacuum type on-load tap changers. In vacuum type on-load tap changers, while tap-changing under load, flammable gases occur in the insulating oil inside the tap changer chamber due to malfunction of vacuum tubes, mechanical breakdowns or fixed and movable bypass contact switches in the oil. Failure detection can be made with limit values and analysis methods determined by looking at the types and amounts of these flammable gases. In this study, vacuum, resistance and separate compartment (VRS) type, on-load tap changers used in power transformers of Turkish Electricity Transmission Corporation (TEİAŞ) are discussed. The warning limits of gases dissolved in mineral oil in these VRSs are determined by using the outlier analysis method in IEEE C57.139 standard. In addition, the N1 region within the X1 region for these OLTCs in the duval triangle2 is determined as the normal operating region.
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