The ratio of the current transformer can be modified by adding more primary turns to the transformer. By adding primary turns, the current required to maintain five amps on the secondary is reduced.
The ratio of the current transformer can be modified by altering the number of secondary turns by forward or backwinding the secondary lead through the window of the current transformer. By adding secondary turns, the same primary current will result in a decrease in secondary output. By subtracting turns, the same primary current will result in greater secondary output.
So exactly what there makes a CT "directional"? It behaves like ANY OTHER TRANSFORMER.
Adding secondary turns to a normal transformer will increase secondary VOLTAGE, while dropping secondary CURRENT. Adding primary turns will DROP secondary voltage, while increasing current (subject to limitations of wire size and core saturation).
The fact that added windings (such as those through a CT window) all need to be wound in the same direction is nothing specific to a CT, either. Again, it has to do with the relative phase relationships between the windings. The same way that the LV windings on a buck/boost transformer can be connected to add or subtract voltage, by connecting them series-aiding or series-opposing.
Not an issue of "direction of current flow", but one of relative phase relationship.
