Running a GST-Guard Test
3-20 72A-1230 Rev. F
July 22, 2005
2. Start a test by clicking the icon, or by selecting from the Test
menu, Run Test - M4000. The “Test Conditions” window will appear if
you haven’t yet filled it in, with “Prb” in the air temperature field. This
indicates that air temperature will be entered automatically by the M4000
Temperature and Relative Humidity Sensor. If “Prb” doesn’t appear, then
the temperature/humidity sensor is not connected or is not working. An oil
temperature is required for oil-filled equipment. If the Temperature and
Relative Humidity Sensor is not used, an air temperature is also required.
3. Click the OK button in the Test Conditions window.
4. A “Run M4000 Test” pop-up window will appear.
5. Choose to run a single or a multiple test. A single test is a test for the line
the cursor is on. The multiple test will run all tests associated with one set
of connections. Select the appropriate choice (see the DTA manual for
details). You will most likely select Multiple Tests - Default.
6. In some types of apparatus, such as live-tank breakers or three-winding
transformers, both red and blue leads are generally used. In such cases,
DTA will ask you where each color lead was placed. You may select the
Setup button in any case, to check the selected test voltage for each test
you plan to do, as well as the default test circuit.
You will then be presented with a safety screen, where test circuit and voltage
can be checked. This is your last chance to be sure these parameters are
correct, and to abort the test if they are wrong.
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