Thermal Modeling of an Inverted-Type Oil-Immersed Current Transformer

被引：7

作者：

Mahajan, Satish M. ^{[1
]}

Robalino, Diego M. ^{[2
]}

Sivan, Vinod ^{[3
]}

机构：

[1] Tennessee Technol Univ, Dept Elect & Comp Engn, Cookeville, TN 38505 USA

[2] Megger, N Amer Substat Grp, Dallas, TX 75247 USA

[3] Cummins Power Generat, Minneapolis, MN 55432 USA

来源：

IEEE TRANSACTIONS ON POWER DELIVERY | 2010年 / 25卷 / 04期

关键词：

Current transformers (CTs); temperature measurement; thermal models; FUNDAMENTAL APPROACH;

D O I：

10.1109/TPWRD.2010.2046188

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A current transformer (CT) is a series device used in power systems for measurement and protection purposes. Useful operational life of these devices is largely determined by the hottest-spot temperature seen by them during various loading conditions. A unique experimental setup was designed to measure top-oil as well as hot-spot temperature profiles of a medium-voltage oil-immersed current transformer. Thermocouples and fiber optic sensors were embedded in the secondary winding of the current transformer. Temperature profiles were recorded with different externally applied current profiles to cause overloads of up to three times the normal rating. Collected data was used in conjunction with existing power transformer thermal models to estimate parameters for the tested CTs. Predicted temperature profiles based on these parameters agree well with the measured values and could be used for offline monitoring under planned overload conditions.

引用

页码：2511 / 2518

页数：8

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