ISA T 2000 - Page 22

DOC. MIE11110 Rev. 5
Page
22
of
110
Purpose of the test is to measure the actual CT ratio and to verify
its polarity, with a test current higher than the one available from
T 2000. To this purpose, the external current booster option
allows to get up to 2000 A. Note that with this test it is impossible
to measure the burden, as it is in the former test.
This test is performed applying current to the primary side; the
test current generated by the booster is measured as voltage,
connecting the booster output to the 10 V measurement input;
the secondary current is measured connecting the CT secondary
to the current metering input.
The connection diagram is the following.