Harmonics in electric power systems can affect the measurement

quality analysis

and relay protection of the power grid. The broad frequency range of electronic transformers makes them suitable for measuring harmonics. However

due to the absence of relevant test system

the measurement of harmonics accuracy for electronic voltage transformers（EVT） has not yet to be widely practiced. We set up a test system for harmonics accuracy of EVTs. A voltage divider system is set up using standard capacitors

and the divider’s actual voltage ratios are determined by measuring their capacitances under different frequencies. A high-voltage follower is developed for the system

connecting the divider system and the testing instrument

in order to increase its accuracy

and the follower’s errors are determined through self-calibration. Finally

the errors of the system are verified

the results are traced to existing standards

and the uncertainties are analyzed. The test results show that the measurement system can meet the requirements of GB/T 20840.8—2007 and IEC 60044-8: 2002 for measuring the errors of the 2 nd to 13 th order harmonics in EVTs 1 000 k V and below. It can also be used to measure the harmonics errors of non-electronic voltage transformers.