The measurement of the losses in power transformers is an indispensable quality-verification process. The TMS 580 system has been specially developed for highly accurate measurements of power losses in transformers.

The TMS 580 system combines well-established and reliable hardware with up-to-date and powerful software.

Loss measurements

The total losses of a transformer are the sum of the no-load and load losses. In general the actual loss figure has to be guaranteed by the manufacturer and is verified for the customer during the acceptance test. The appropriate standard is IEC 60076-8 clause 10
“Guide to the measurement of losses in power transformers”.

Measurement Accuracy

The power factor (cos ϕ) of large transformers is small. Even minute phase angle errors of the instrument transformers can lead to substantial power measurement errors. The instrument transformers of the TMS 580 are specially designed to ensure very small phase angle errors thus making additional error correction redundant.

The maximum power measurement error is a function of the power factor.

To allow the current and voltage distortion to be properly measured the TMS 580 instrument accurately responds to the power frequency harmonic encountered.