Measured transformer derating and comparison with harmonic loss factor (FHL) approach

被引：51

作者：

Yildirim, D ^{[1
]}

Fuchs, EF ^{[1
]}

机构：

[1] Univ Colorado, Boulder, CO 80309 USA

来源：

IEEE TRANSACTIONS ON POWER DELIVERY | 2000年 / 15卷 / 01期

关键词：

eddy-current loss; harmonic loss factor F-HL; nonlinear load; stray power losses; transformer derating;

D O I：

10.1109/61.847249

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：

The eddy-current loss coefficient of a transformer can be determined by using the harmonic amplitudes of input current and the corresponding harmonic copper losses when the transformer supplies nonlinear loads. Measured data show that eddy-current loss is a linear function of frequency with a power of 2, Apparent power (kVA) derating of single-phase transformers operating with nonsinusoidal currents and voltages is measured by adjusting the total losses to the rated losses at rated temperature, whereby hot-spot considerations are ignored. Computed results of derating using the harmonic loss factor (F-HL), eddy-current loss coefficient PEC-Rnonlinear and iron-core losses match well with measured data. However, the real power derating of transformer is much greater than apparent power derating for a given THDi value, and it is independent of the frequency spectra of the harmonics. Experiments show that the other stray losses (P-OSL) in nearby conductive solid components are proportional to the power of 0.8 at low frequencies and are inversely proportional to the power of 0.9 at high frequencies.

引用

页码：186 / 191

页数：6