23
to the system. In either case, there is current owing through all three current
terminals.
Fig 2-12 3CTs a
Fig 2-13 3CTs b
2CT
The dierence between Fig 2-14 and Fig 2-15 is that no current ows through
current input terminal I21 and I22. The meter should be set to the I2 value
which is calculated from formula i1+i2+i3=0. The current input mode of the
meter should be set to 2CT .