When using the dry-type transformer, the user must master the wiring method. If there is a problem in the wiring, it is easy to cause use failure. So what is the connection method of dry-type transformer? Let's introduce it in detail.
Wiring method of dry-type transformer:
1. Short circuit the "input" and "output" terminals of the transformer and test their insulation resistance with a megger. When measured by a 1000V megger, the resistance is greater than 2m ohm.
2. The section wiring of the input and output power lines of the transformer shall meet the requirements of its current value; it is appropriate to configure 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. The zero line shall be connected to the neutral zero line of the transformer voltage, the ground wire, the transformer shell and the transformer center point. Generally speaking, the ground wire and the zero line are all led from the neutral point of the transformer. (if the transformer has a case, it shall be connected with the ground wire mark of the case). Check the input and output lines to make sure they are correct.
4. First, power on no-load, and observe that the test input and output voltage meet the requirements. At the same time, observe whether there is abnormal sound, ignition, peculiar smell and other abnormal phenomena inside the machine. If there is any abnormal phenomenon, please disconnect the input power supply immediately.
5. After the no-load test is completed and normal, the load can be connected.
