Running a GST-Guard Test
3-16 72A-1230 Rev. F
July 22, 2005
Leakage Reactance Test (Optional Software)
1. Click on the Leakage Reactance button to display the Leakage
Reactance test. Fill in Location, Manufacturer, and Serial Number.
2. Click the Benchmark tab and enter the nameplate data; this includes the
transformer impedance, and the MVA, kV, and tap positions at which it
was measured in the factory.
3. If this is not the first test, enter the benchmark values from the first test; if
it is the first test, enter the transformer nameplate impedance in both the
impedance and reactance benchmark fields.
4. Select the Winding Configuration, then the Test Configuration. If this is
the first test, perform a 3 phase equivalent test for comparison to
nameplate impedance, then three per phase tests (one per phase) to obtain
benchmark values for each phase for comparison to future tests.
5. Use the Phase column to identify the winding measured.
6. Click the Run a Test icon to start the test.
For complete details of this test, including test setup and connections, see
“Leakage Reactance Testing” in the Doble Test Procedures manual.
NOTE Always exit Windows before shutting off your M4000 Insulation
Analyzer.
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