Loss Measurements on Power Transformers and Reactors

Short Name: TrafoLoss, Project Number: 17NRM01
Renewable green energy - power substation and wind turbines

Improving the efficiency of grid power transformers and reactors

By 2030 the EU aims to reduce greenhouse gas emissions by at least 55% compared to 1990s level. Improving devices that deal with large amounts of energy could significantly contribute to this goal, as even small increases in efficiency can lead to substantial reductions in energy waste. Estimates suggest, for example, that the equivalent of half of Denmark’s total electricity consumption could be saved simply through more efficient grid power transformer designs. To help implement such changes, the European Ecodesign Directive requires power transformer and reactor manufacturers to prove that their products comply with efficiency regulations to reduce grid losses. However, precise and reliable loss measurements remain a challenging task.


This project has established highly accurate loss measurement systems for transformers and reactors, and developed prototype devices that significantly reduce measurement uncertainty. By enabling European manufacturers to produce high quality grid components and demonstrate compliance with the Ecodesign regulations, manufacturers will be able begin making steps toward meeting the EU’s 2020 energy objectives.


This project builds on from EMPIR project 14IND08 ElPow.

Project website
Verification of a Capacitive Voltage Divider With 6-μrad Uncertainty Up To 100 kV

IEEE Transactions on Instrumentation and Measurement

Verification of High Voltage Divider with 10E-6 Uncertainty

2020 Conference on Precision Electromagnetic Measurements (CPEM)

Comparison of Reference Setups for Calibrating Power Transformer Loss Measurement Systems

IEEE Transactions on Instrumentation and Measurement

Reliable Power Transformer Efficiency Tests

Proceedings 5th International Colloquium “Transformer Research and Asset Management” Opatija/Croatia, October 09 – 12, 2019

Estimating Uncertainty in Loss Measurement of Power Transformers

Proceedings of the 21st International Symposium on High Voltage Engineering

A Sampling-Based Ratio Bridge for Calibrating Voltage Transformers

2018 Conference on Precision Electromagnetic Measurements (CPEM 2018)

Other Participants
EPRO Gallspach GmbH (Austria)