Wiring method of dry type transformer

1. Short-circuit the "input" and "output" terminals of the transformer and use a megohmmeter to test the insulation resistance between them and the ground wire. When measured with a 1000V megohmmeter, the resistance is greater than 2M ohms.
2. The cross-section wiring of the transformer input and output power lines should meet the requirements of the current value; it is appropriate to configure it according to the current density of 2-2.5A/min2.
3. The input and output three-phase power lines should be connected to phase A, phase B, and phase C according to the yellow, green, and red busbar colors of the transformer wiring board. The neutral line should be connected to the neutral neutral line of the transformer, and the grounding wire, transformer casing, and transformer center point are connected. The ground wire and neutral line we usually talk about are all drawn from the neutral point of the transformer. (If the transformer has a chassis, it should be connected to the corresponding ground wire mark of the chassis).
Check the input and output lines to confirm that they are correct.
4. Power on without load first, and observe that the input and output voltages meet the requirements. At the same time, observe whether there are abnormal phenomena such as abnormal noise, sparking, odor, etc. inside the machine. If there is any abnormality, please disconnect the input power immediately. 5. When the no-load test is completed and normal, the load can be connected.