A Comparison of Instrumentation for Measuring the Losses of Large Power Transformers

Malewski,; Arseneau,; So,; Moore, Nicholas J.

doi:10.1109/mper.1983.5519021

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“…However, the correction method is only valid for a reasonably distorted voltage wave. If the supply voltage waveform is so distorted, for example with more than two zero crossings in a one period [3], that it exceeds a certain limit set by the standard, the voltage waveform is then considered to be not suitable for use. The total correction of core loss due to this effect is limited to 5% [1,2].…”

Section: Discussionmentioning

confidence: 99%

No-load loss measurements of power transformers under distorted supply voltage waveform conditions

Arseneau

Hanique³

Conference Digest Conference on Precision Electromagnetic Measurements

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The problem of correcting the results of no-load loss measurements of power transformers for the effect of distorted supply voltage waveform on the magnetic flux in the core and hence on both the hysteresis and eddy current loss components of core losses will be presented. The instrumentation requirements for no-load loss measurements to ensure proper application of the correction formula will be described. SummaryThe no-load loss of a power transformer is the active power loss in a power transformer when it is energized but not supplying a load. It consists primarily of a core loss due to the magnetization of the core, which is a function of the magnitude, frequency, and waveshape of the excitation voltage. It also varies with temperature, and is particularly sensitive to distortion of the supply voltage waveform. The no-load loss is a very small part of the power rating of a power transformer, usually less than 1%. For a constant operating voltage and frequency, it is essentially constant and does not vary with load. Hence, it can represent a significant operating expense, especially if the energy costs are high.Therefore, accurate measnrements of no load losses are essential in the performance evaluation of power transformers. It is often a determining factor when electrical utilities select a supplier for their power transformer purchases.

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Section: Discussionmentioning

confidence: 99%

No-load loss measurements of power transformers under distorted supply voltage waveform conditions

Arseneau

Hanique³

Conference Digest Conference on Precision Electromagnetic Measurements

View full text Add to dashboard Cite

show abstract

A Comparison of Instrumentation for Measuring the Losses of Large Power Transformers

Cited by 1 publication

References 0 publications

No-load loss measurements of power transformers under distorted supply voltage waveform conditions

No-load loss measurements of power transformers under distorted supply voltage waveform conditions

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