The impulse current is of transient current waveform and difficult to be assessed due to its short duration

no repetition of waveform and multiple measurement error influence factors. In this paper

the traceability method and uncertainty assessment model of the impulse current measurement device is studied. The standard equipment is developed and measurement uncertainty is reduced as much as possible so to achieve the establishment of 100 kA standard measurement system. The standard system includes current converting device（impulse shunt）and measuring instrument for measurement uncertainty assessment of peak current and time parameters resp

ectively. The uncertainty component

introduced by the dynamic characteristic of the shunt

is evaluated by the step response results. The different evaluation methods of linearity of the shunt are studied

showing that the result is in agreement with the comparison test results of rigid Rogowski coil and those obtained by the temperature rise calculation and evaluation method. The calibration factor and time parameters of the measurement instrument are calibrated by the developed voltage standard wave source. Finally

the performance of the whole system is assessed so to achieve the traceability of impulse current scale factor and time parameter. The measurement uncertainty of the scale factor is4.1×10

-3

（k=2） and of time parameter is 8 ×10

-3

（k=2）. The assessment result shows that the measurement accuracy of the established 100 kA impulse current standard measurement device has reached the advanced level.