Rishabh RISH LM 1340 - Current Transformer Primary Value

3.2.1.4 Current Transformer Primary Value
The nominal Full Scale Current that will be displayed as the Line currents. This screen enables the user to
display the Line currents inclusive of any transformer ratios, the values displayed represent the Current in
Amps.
Current Transformer Primary Digit Edit
Pressing the “ ” key accepts the present value and advances to the
“Current Transformer Secondary Value” screen (see Section 3.2.1.5).
Similarly, pressing the “ ” key accepts the present value and advances to
the “Potential Transformer Secondary Value” menu (see Section 3.2.1.3).
Pressing the “ ” key advances to the “Current Transformer Primary Digit
Edit” mode.
Pressing the “ ” or “ ” key scrolls the value of the most significant digit
from 0 through 9 or 9 through 0, respectively (with digit roll over feature)
unless the present displayed Current Transformer Primary Value together
with the Potential Transformer Primary Value results in a maximum system
power of greater than 5400 MVA (1800 MVA per phase) in which case the
digit range gets restricted, the value will wrap.
Example: If primary value of PT is set as 1200 kVL-L (max value) then
primary value of Current is restricted to 1804 A.
Pressing the “ ” key accepts the present value at the cursor position and advances the cursor to the next
less significant digit.
The “Maximum Power” restriction of 5400 MVA refers to 120% of nominal current and 120% of nominal
voltage, i.e, 1250 MVA nominal power per phase.
After entering the least significant digit, pressing the “ ” key sets the value and advances to the “Pls Wait”
screen followed by “Current Transformer Primary Value” screen (see Section 3.2.1.4).
NOTE: Default value is set to ‘5’ i.e. 5A.
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