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3.5 Full Scale Current
This parameter is the value of nominal Full Scale Currents 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. For example setting 800 on this
screen will cause the display to indicate 800 amps when the nominal maximum (typically 5A or
factory build option of 1A) current flows through the transducer current inputs.The maximum
value is as specification.
Press >> to accept the present value and move on to the next
Set-up screen (Section 3.6 Potential Transformer Primary
Voltage).
To change the Full Scale Current, press and change the
current value as detailed in Section 3.2 Number Entry
Procedure. If the presently displayed current, together with the
full scale voltage value, results in an absolute maximum power
(120% of nominal current and voltage) of greater than 360
Megawatts, the range of the most significant digit will be
restricted.
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 >> 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 >> key is pressed.
3.6 Potential Transformer Primary Voltage
This value is the nominal full scale voltage which will be displayed as L1-N, L2-N and L3-N for a
four wire system, L1-2, L2-3 and L3-1 in a three wire system or system volts for single phase.
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
indicator). For example, on a 2.2kV system with 110V potential transformer secondary, set 2.200
at this screen.
If there is no potential transformer (PT) in the system, i.e. the voltage terminals are connected
directly to the metered voltage, leave this value unchanged and skip this set up step.
If the PT primary and secondary values are changed and it is desired to revert to a set-up with
no PT, then set both PT primary and secondary values to the nominal maximum voltage for the
Integra transducer.
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Integra 1540, 1000, 0640, 0440, 0340, 0240 Issue 1 04/03
0240 0340 0440 0640 1000 1540
0240 0340 0440 0640 1000 1540