Hoyt Electrical Instrument Works, Inc. Alpha 40A Plus, Operating Manual

Page: 14 / 43

This screen will only appear
following an edit of the
Potential Transformer Primary
Value.
If the scaling is not correct, pressing the “ ” key
will return to the “Potential Transformer Primary
that the multiplier (decimal point position) should be
selected.
Pressing the “ ” key sets the displayed value and
will advance to the Potential Transformer secondary
Value (See Section 3.2.1.3)
Pressing the “ ” key accepts the present value at
the cursor position and advances the cursor to the
Pressing the “ ” key
accepts the present value
and advances to the “Current
Transformer Primary Value
edit” menu.(See Section
3.2.1.4)
The ratio of full scale primary to full scale secondary
The PT Secondary value can be set from 100VL-L
to 480VL-L (according to input voltage range).
Pressing the “ ” key will enter the “Potential
Transformer Secondary Value Edit” mode. “ ” key
from available range of PT secondary value. Please
refer the table below for different ranges.
3.2.1.3 Potential Transformer
Secondary Value
The value must be set to the nominal full scale
secondary voltage which will be obtained from
the Transformer when the potential transformer
in 3.2.1.2 Potential Transformer Primary voltage.
pressing the “ ” key will advance to the “Potential
This screen will only appear
following an edit of the
Potential Transformer
Secondary Value .
.
If the scalling is not correct, pressing the “ ” key
will return to the “Potential Transformer Secondary
Value Edit” menu.
Pressing the “ ” key sets the displayed value and
will advance to the Current Transformer Primary
Value. (See Section 3.2.1.4)
cursor position, a steady decimal point will be
present to identify the scaling of the number
until the cursor position coincides with the
steady decimal point position. At this stage the
Potential Transformer secondary ranges for
various Input Voltages
Input Voltage PT Secondary Settable Range
110V L-L (63.5V L-N) 100V – 125V L-L (57V – 72V L-N)
230V L-L (133V L-N) 126V – 250V L-L (73V – 144V L-N)
415V L-L (239.6V L-N) 251V – 480V L-L (145V – 277V L-N)
Potential Transformer Secondary Value
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