The “Maximum Power” restriction of 360 Megawatts refers to 120% of nominal current and
120% of nominal voltage, i.e. 250 Megawatts nominal system power.
When the least significant digit has been set, pressing the “>> Next” key will advance to the
“Full Scale Current Confirmation” stage.
The minimum value allowed is 1, the value will be forced to 1 if the display contains zero when
the “>> Next” key is pressed.
Full Scale Current Confirmation.
This screen will only appear following an edit of the full-scale
current.
If the scaling is not correct, pressing the “
Adjust” key will
return to the “Full Scale Current Edit” stage with the most
significant digit highlighted (associated decimal point flashing)
and the bottom line of the display will be blanked.
Pressing the “>> Next” key sets the displayed value and will
advance to the “Potential Transformer Ratio” menu. (See
Section 5.2.2 Potential Transformer Ratio).
5.2.2 Potential Transformer Ratio Primary Value
The nominal full scale voltage which will be displayed as the L1-N, L2-N and L3-N for a four wire
system or as L1-2, L2-3 and L3-1 in a three wire system. This screen enables the user to display
the line to neutral and line to line voltages inclusive of any transformer ratios, the values
displayed represent the voltage in kilovolts (note the x1000 enunciator).
Pressing the “>> Next” key accepts the present value and
advances to the “Demand Integration Time” menu. (See
Section 5.2.3 Demand Integration Time Edit).
Pressing the “
Adjust” key will enter the “Potential
Transformer Ratio Edit” Mode.
Initially all the digits of the current value will be flashing and
the decimal point position will be illuminated. This is to
indicate that initially the “multiplier” must be selected,
pressing the “
Adjust” key will move the decimal point
position to the right until it reaches ###.# after which it will
return to #.###.
Pressing the “>> Next” key will accept the present multiplier
(decimal point position) stop the digits flashing and advances
to the “Potential Transformer Digit Edit” mode.
17
