In fact, the voltage of 10kV distribution transformer can be adjusted. The voltage regulation of transformer generally has three gears and five gears.
When adjusting the gear, adjust the tap switch to the corresponding position according to the output voltage.
The operation steps of adjusting tap changer are as follows:
1. Disconnect the transformer load, open the high-voltage drop fuse with an insulating rod, unscrew the protective cover of the transformer tap changer, and place the locating pin in the neutral position.
2. When shifting gears, adjust the tap switch to the corresponding position according to the output voltage. When the voltage is too low, adjust to the low-voltage gear; when the voltage is too high, adjust to the high-voltage gear.
3. After adjusting the gear, measure the DC resistance of each phase winding with a DC bridge and check whether the DC resistance between windings is balanced. If the phase to phase resistance difference is greater than 2%, it needs to be readjusted. Otherwise, the static and moving contacts will generate heat or even discharge due to poor contact and damage the transformer.
The article is integrated from purlux Ziguang electric and Baidu