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4.4.1 CT RATIO
The CT RATIO is the CT ratio of the bushing CT which the split core CT is
applied to. The CT ratio must be relative to 1. Therefore, if the CT ratio is 300:5
the CT ratio to enter is 60. The ratio of the split core is already accommodated in
the unit. CT ratios can be set for CT’s 1,2 and 3.
Programming CT RATIO1 from the front panel, enter the Configuration menu and
press the
arrow button until the setting 033 is displayed:
Press the
YES
button. The first digit will flash. Use the
or
arrow buttons to
scroll through the digits 0 – 9. Use the
or
buttons to scroll between the
digits. The currently active digit will flash. Press
YES
after you have entered all
four digits.
For programming from a PC just type the CT ratio on the “Enter:” line as follows:
Enter:33/60
4.4.2 Rated Load
The Rated Load setting is the top name plate rating in Amps. There are 3
separate Rated Load settings for CT’s 1,2 and 3. If the nameplate indicates
ratings of 1000/1200/1400, use 1400 as the rated load. On some transformers
the nameplate might only list the rating in MVA. In this case you will need to
divide the top MVA rating by the voltage of winding monitored with the CT. The
rated load for a 3 phase transformer is calculated as follows:
Rated Load = MVA / (Voltage x 1.732)
Programming RATED LOAD from the front panel, enter the Configuration menu
and press the
arrow button until the setting 034 is displayed:
Press the
YES
button. The first digit will flash. Use the
or
arrow buttons to
scroll through the digits 0 – 9. Use the
or
buttons to scroll between the
digits. The currently active digit will flash. Press
YES
after you have entered all
digits. Rated Load for CT #2 and #3 are set in a similar way.
For programming from a PC just type the Rated Load on the “Enter:” line as
follows:
PRGM SETTING 033
CT RATIO1=0000
PRGM SETTING 034
RATED LOAD1=0000
Summary of Contents for TTC-1000
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