Delta 4000 Instruction Manual download pdf (Page 63)

Delta 4310 User Interface

81331 Rev 01 Nov 2010

Testing

When testing is ready to be performed, the test can be started by;

 Right-click the desired blue highlighted test number

 or press F2 when the actual test row is activated (highlighted in yellow)

 or for Delta4310 press the “Test” button when actual test row is

activated

and click “Start” on the pop-up screen or press enter key to start generating the

test voltage.

The proper connections for the programmed tests are described below.

Bushing tests will only be performed on CT bushings that have test taps, usually

those rated 15kV and above. Hot collar tests are generally performed on HV

bushings that do not have test taps.

Transformer Overall Tests

Test 1 - This is a measurement of the overall insulation test on the CT primary

winding. Short H1 and H2 together and connect HV cable. Short secondary

winding X together and connect to Ground. Test mode is GST-GND.

Test 2 - This is a measurement of the C1 insulation of the CT. This test is only

performed if the CT main bushing has a capacitance or test tap. The HV cable

remains connected to the H winding (which can remain shorted together) and

the LV Red lead is connected to the test tap. Test mode is UST-R.

Test 3 - This is a measurement of the C2 insulation of the CT. This test is only

performed if the CT main bushing has a capacitance or test tap. The HV cable is

connected to the test tap and the LV Red lead is connected to the H winding

(which can remain shorted together). Test mode is GSTg-R.

CAUTION

Bushing test taps have very limited insulation and should

generally be energized at reduced voltage levels. If the CT or

bushing manufacturer does not specify a test voltage level

use no more than 500 volts (0.5kV) for test 3.

Test 4 - This is a repeat of Test 1 (same connections) only performed at 2kV (if

Test 1 was performed at 10kV).

Test 5 - This test is available as a Miscellaneous Test that can be performed on

the primary (H) winding of the CT for further investigation of unusual readings,

if necessary. The test mode is GST-GND.

Test 6 - This test is available as a Miscellaneous Test that can be performed on

the primary (H) winding of the CT for further investigation of unusual readings,

if necessary. The test mode is GST-GND.

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Delta 4000 Instruction Manual Page 63