SF6 gas insulated transformer test
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In accordance with the requirements of the "pre-regulation," the following tests must be conducted on SF6 gas-insulated transformers:
1) Humidity test of SF6 gas (volume fraction at 20°C);
2) Analysis of SF6 gas;
3) Leak detection test for SF6 gas;
4) Measurement of DC resistance in windings;
5) Testing of insulation resistance, absorption ratio, or polarization index of windings along with bushings;
6) Measurement of tan δ (dielectric loss factor) of windings together with the casing;
7) Measurement of insulation resistance of the core and clamping structure;
8) AC withstand voltage test.
The details of these tests are outlined below:
(1) Test 4: For parts related to oil-immersed transformers, the windings on the cable or GIS side of a closed outlet may not require periodic testing. This is because these sections are typically isolated and less susceptible to degradation under normal operating conditions.
(2) Tests 5 and 6: For oil-immersed transformer components, the windings on the cable or GIS side of a closed outlet can be tested at the neutral point. This approach simplifies the process while ensuring accurate measurement of insulation properties.
(3) Test 7: The same procedure applies to oil-immersed transformers, where the insulation resistance of the core and clamp should be measured to ensure there are no grounding issues or short circuits.
(4) Test 8: Similar to oil-immersed transformers, 110kV SF6 gas-insulated transformers undergo an induced voltage withstand test. This method is more suitable for high-voltage equipment as it simulates real-world stress conditions without overloading the system.
These tests are essential to ensure the safe and reliable operation of SF6 gas-insulated transformers, helping to identify potential faults early and prevent failures. By following these procedures, maintenance teams can maintain the integrity of the equipment and extend its service life.