Arbiter Systems Portable Power Sentinel 933A, Руководство по эксплуатации

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3.6 CT/PT Setup
To automatically compensate for CT’s and PT’s (current and potential
transformers), the 933A provides the CT/PT Setup menu to install these
constants. By doing this, the 933A can directly display the primary current
or voltage by converting the actual secondary current or voltage to the
primary value. It does this by multiplying the secondary current or voltage
by the CT/PT ratio and adding the phase difference to zero reference
phase.
In the CT/PT Setup menu, you will find space to enter magnitudes
and phase angles for each configured phase as seen in Figure 3.8.
Figure 3.8: CT/PT
Setup Menu
Setting up CT & PT Values:
1. Press the Setup key and choose 4-CT/PT Setup.
2. Use any of the cursor keys to select the desired value (e.g. A-PHASE
CT RATIO). The rectangle will surround the chosen value and it will
be described in large letters in the lower portion of the display.
3. Use the number keys to enter the CT ratio or phase offset and press
ENTER to install.
4. If the value is nominal for all phases press the APPLY TO A, B &
C soft key.
5. Press the SAVE ALL soft key to save the new CT/PT values.
CT Table
The method above allows a single calibration point for each phase CT.
Using the PSCSV-933 application software, a 12-point CT table may be
entered into the 933A that compensates for a broad operating range. See
Section 6.2.6 for more information on entering a CT table.
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