The main transformer refers to the total step-down transformer of a unit or substation, and its capacity is generally relatively large. Other transformers are used for power distribution, and are generally called distribution transformers with a slightly smaller capacity.
Regarding the protection of the main transformer, as the main transformer, generally speaking, the capacity is relatively large, and the reliability of the work is required to be high. For transformers of different capacities, the required protection categories are also different.
Second, the transformer used:
Generally speaking, the high-voltage switchgear of the substation needs to provide 220V operating power, and the DC screen also needs 220 power to continue floating charge. Since there is no low-voltage power supply when operating the high-voltage cabinet, a transformer with a small capacity is installed in the high-voltage cabinet. From to provide the first power supply required for the operation of the high-voltage cabinet, when the transformer is switched on, there is a second power supply that outputs the low-voltage power circuit in the low-voltage cabinet, so it automatically switches to the normal low-voltage side power supply as the operating power supply.
Features: Good thermal stability, high reliability, and long service life. Low loss, low noise, and maintenance-free.
