Wiring method of power transformer

When using the power transformer, the user needs to master the wiring method. If there is a problem in the wiring, it will easily lead to malfunction. So what is the wiring method of the power transformer? Let me introduce it in detail below.

1. Short-circuit the input and output terminals of the transformer and use a megger to test the insulation resistance between it and the ground wire. When measuring with a 1000V megohmmeter, the resistance value should be greater than 2M ohms.

2. The cross-section wiring of the input and output power lines of the transformer should meet the requirements of its current value; it is more 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 the A-phase, B-phase, and C-phase according to the color of the transformer wiring board busbar, yellow, green, and red, respectively. point to connect. Usually, the ground wire and neutral wire we say are drawn from the neutral point of the transformer. (If the transformer has a case, it should be connected to the ground wire mark of the case). Check the input and output lines to make sure they are correct.

4. Power on without load first, and observe and test that the input and output voltages meet the requirements. At the same time, observe whether there are abnormal sounds, sparks, odors 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 is the wiring method of the power transformer. The size of the resistance and current should meet the requirements, and the appropriate ammeter and resistance meter should be selected. Be careful to turn off the power when wiring. After turning on the power, if there is any abnormality, disconnect the power immediately.