Precautions for Series Resonance Test Syetem

1. During the test, the test phase is connected to the high-voltage source, and the high-voltage lead wire needs to use a special halo-free lead wire, and the non-test phase is grounded with the GIS shell;

2. The test must ensure that the SF6 gas in each gas chamber is under the rated pressure, and the gas content is within the acceptable range after 4 hours of inflation pressure, and the GIS is in an operable state. The test can only be performed after confirmation;

3. Before pressurizing the test, ensure that the voltage transformer in the GIS is removed (if the GIS manufacturer agrees, the voltage transformer can be pressurized together, but the test resonant frequency must be greater than 100Hz), the CT secondary short circuit, and the connection of the arrester should be disconnected;

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4. The test voltage is added to the output bushing, the bushing core is connected to the high voltage source, and the metal bushing is connected to the special ground wire of the system;

5. During the test, special ground wires must be used between the components of the test system and between the test system and the GIS shell, and the on-site ground bar must not be used to replace the ground wire connection between the test system and the GIS shell;

6. Pay attention to the one-point connection between the test system and the on-site power grid, and the grounding point must be located on the connection line between the voltage divider and the test object;

The principle and matters needing attention of transformer external application test

The externally applied test is a basic test to test the main insulation of the transformer, and the test frequency shall not be lower than 80% of the rated frequency;

Attention to the external application test of the transformer:

1. Both the tested winding and the non-test winding are short-circuited, and the non-test winding is grounded after short-circuiting. In principle, the test product must not have potential suspension;

2. During the test, the connection between the frequency conversion resonant system and the tested transformer shell adopts the special ground wire provided by the company;