Read the study
"Among the 10 models tested, the issue appears to be a component known as the Rogowski Coil"
"While the highest deviation between actual energy consumption and reported energy consumption was 582 per cent, some of the meters made errors in favor of the customer. Two reported about 32 per cent less usage than actually occurred."
From the actual study:
"the positive deviation for Rogowski coil current sensors and negative deviations for the Hall sensors"
"The fourth meter, with a current transformer"
So no, this isn't simply a problem with Rogowski coils, it's a problem with three different kinds of sensors that cause different kinds of errors - over-reading for Rogowski coils, under-reading for Hall sensors, and both for current transformers. In fact, it's actually a problem with four different sensors giving different readings, since the values quoted are relative to an electromechanical meter which is simply assumed to be accurate - while they may well be better than newer meters nothing is perfect, and it would be interesting to see what kind of errors they have themselves.
Biting the hand that feeds IT
