Vanguard LTCA-10, LTCA-40, WRM-10P, WRM-40 - Manual (Page 61)

REV 3 LTCA VERSION 2.xx SOFTWARE MANUAL
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5.2 Running an LTCA/Voltage Regulator Resistance Test
The Load Tap Changer/Voltage Regulator Resistance Test can be used to conveniently measure
the resistance at each tap position. Once the number of taps has been entered, the WRM will
request the user to set the tap position, starting with the lower taps, then to neutral, and then
to the raise taps. The resistance is measured at each tap position and stored.
Follow the steps below to perform a Load Tap Changer Analyzer (LTCA) or Voltage Regulator
resistance test:
1. Make sure the WRM or LTCA is properly connected to the PC. Also ensure that the LTCA
software is properly configured to use the selected interface and port, if applicable (see
section 3.3).
2. Make all necessary cable connections per the WRM or LTCA User’s Manual and ensure
that the unit is in computer control mode, if necessary.
3. Click on the Run icon.
4. The following window will be displayed:
Select the “LTCA/VLTG Regulator Resistance Test” option and enter the number of steps
in the “# Steps” text box. We will enter “3” for this example. Click on the “OK” button.