Energy Meter Manual

Parameter Setting Operations
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IM 77C01E01-01E
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3.2 Setting the VT and CT Ratios
Setting the CT Ratio
This section explains how to set the CT ratio by taking as an example the case when the CT ratio is
changed from the initial value (1.00) to 10.00.
Operation
Operation
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CT Ratio Setting screen
The alterable digit blinks.
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CT Ratio Setting screen
CT Ratio Setting screen
CT Ratio screen
Press once to
blink the setpoint.
CT Ratio Setting screen
Press once to fix the
position of the decimal point.
Using or ,
change the setpoint.
Measured Value screen
1
The parameter (VT ratio)
appears.
VT Ratio screen
Press once.
Current value
The parameter (CT ratio)
appears.
CT Ratio screen
Press once.
The screen changes to the one
for setting the parameter
and the decimal point blinks.
Hold down for at
least 3 seconds.
To move the decimal point, use the
following keys:
To the left To the right
Press once while
the setpoint is blinking.
The setpoint is confirmed and the
PR300 returns to the CT Ratio screen.
CT ratio setting completed.
To return to the Measured Value
screen, hold down .
If you do not operate any key for more
than 5 minutes on the Parameter
screen, the PR300 automatically
returns to the Measured Value screen.
Setpoint
To move to the digit to be changed,
use the following keys:
To the left To the right
To re-set the parameter:
Press any key other than
while all digits of the
setpoint are blinking.
The PR300 returns to the initial
setting screen.
Parameter Setting Types and Ranges
Parameter Symbol Parameter Name
Setting
Type
Setting Range (Details)
Initial Value
(Factory-set
Value)
CT ratio
Floating-point
numeric
value
0.05 to 32000
1.00
NOTE
Set the VT and CT ratios so that the value of “secondary rated power  VT ratio  CT ratio” is smaller
than 10 GW. If this value exceeds 10 GW, the updated VT or CT ratio will not be incorporated but revert
to the current value before change.