Abstract
The departures from uniformity of the electric field, expressed as (E - E0)/E0, have been calculated for fields produced by 90° Rogowski, 120° Rogowski and Bruce electrodes. The fields on the axes of the electrodes were found to be uniform to better than 1 part in 107 for the Rogowski profiles and to better than 1% for the Bruce profile. The effect of increasing the 120° Rogowski electrode separation to twice its design value and the influence of the walls of the containing vessel on the electric field were investigated.
A new uniform-field electrode profile is presented which is a compromise between the Bruce and Rogowski forms. Accurate values of the field produced by this new profile are given.