Hoyt Electrical Instrument Works, Inc. Alpha 40A Plus, Руководство по эксплуатации

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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.
Pressing the “ ” key accepts the present value and
advances to the Current Transformer secondary
Value (See Section 3.2.1.5)
Pressing the “ ” key will
enter the “Current Transformer
Primary Value Edit” mode.
Pressing the “ ” key will advance to the next less
The “Maximum Power” restriction of 3000 MVA
refers to 120% of nominal current and 120% of
nominal voltage, i.e, 2083.3 MVA nominal power
per phase.
pressing the “ ” key will advance to the “Current
The minimum value allowed is 1, the value will be
forced to 1 if the display contains zero when the
“ ” key is pressed.
from 0 through to 9, unless the presently displayed
Current Transformer Primary Value together with
the Potential Transformer Primary Value results in a
maximum system power of greater than 3000 MVA
(1000 MVA per phase) in which case the digit range
will be 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 1002 A.
.
3.2.1.5 Current Transformer Secondary Value
This screen is used to set the
secondary value for Current
Transformer. Secondary value
“5” for 5A or “1” for 1A can be
selected.
Pressing “ ” key accepts the present value and
advances to the Demand integration Time
(See Section 3.2.1.6)
Pressing the “ ” key will enter the CT Secondary
value edit mode and scroll the value through the
values available.
Pressing the “ ” key will advance to the CT
If the scaling is not correct, Pressing the “ ” key
will return to the “Current Transformer Primary Value
line of the display will be blanked.
Pressing the “ ” key sets the displayed value and
will advance to the “Current Transformer Secondary
Value Edit” menu. (See Section 3.2.1.5)
This screen will only appear
following an edit of the
Current Transformer Primary
Value.
This screen will only appears
following an edit of CT
secondary value. If secondary
value shown is not correct,
pressing the “ ” key will return to CT secondary
edit stage.
NOTE: Default value is set to ‘5’ i.e. 5A.
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