In general, there are two kinds of lines in dry-type transformer, one is the live line of dry-type transformer, the other is the zero line of dry-type transformer. These are the important lines of dry-type transformer. There is an important line in dry-type transformer, which is the zero line of dry-type transformer. So how to connect the zero line of dry-type transformer? Let's have a detailed understanding with the editor of dry-type transformer factory
1. Short circuit the "input" and "output" terminals of the transformer, and use a megohmmeter to test its insulation resistance with the ground wire. When measuring with 1000V megohmmeter, the resistance is greater than 2m ohm.
2. The section wiring of input and output power lines of transformer shall meet the requirements of its current value, and it is suitable to be configured according to the current density of 2-2.5a/min2.
3. The input and output three-phase power lines shall be connected to phase a, phase B and phase C respectively according to the color of the bus bar of the transformer terminal board. The zero line shall be connected to the neutral zero line of the transformer voltage transformer, and the ground line, the transformer shell and the transformer center point shall be connected. In general, the ground line and the zero line are led out from the neutral point of the transformer. (if the transformer has a box, it should be connected with the box ground wire mark). Check the input and output lines to make sure they are correct.
4. First power on no-load, observe and test the input and output voltage to meet the requirements. At the same time, observe whether there is abnormal sound, sparking, peculiar smell and other abnormal phenomena 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.
The above are the main connection ways and methods of the zero line of the common dry-type transformer for your reference. If you have any other questions about the connection of the zero line of the dry-type transformer, please log in to our website for detailed understanding!
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