Basic principles of medium voltage switchgear

The basic principles of medium-voltage switchgear are not complex. To ensure efficient and long-term operation in everyday life and production, it must ensure a stable supply of secondary DC and AC power. The current transformer within the medium-voltage switchgear typically contains two or three sets of coils. One set of coils is used for measurement, such as connecting a multimeter. Another set of coils provides protection for the entire internal circuit of the medium-voltage switchgear. For example, some ABB protection units, if a third set of coils exists, are only present in the 100A incoming switchgear, providing differential protection. If the incoming, outgoing, and grounding lines pass through a zero-sequence current transformer, it is important to check for three-phase unbalanced current. Different power sources support different operating components, and the AC and DC are used and divided according to specific circumstances. These are the basic principles of medium-voltage switchgear.